Packaging bags

Abstract

To provide a packaging bag that can be opened easily without causing decorative paper to become waste by applying release glue and sticking glue separately to the back side of the decorative paper.SOLUTION: Release glue R1 is applied to the right and left surfaces of a lower horizontal strip 4 of a rectangular bottom part 2 of a packaging bag, release glue R2 is applied to the right and left surfaces of an upper horizontal strip 5, release glue R3 is applied horizontally to a horizontal edge 5b of the upper horizontal strip 5, and the upper horizontal strip 5 and the lower horizontal strip 4 are folded along a lower horizontal line T1 and an upper horizontal line T2 and are glued with the release glue. Rectangular-shaped decorative paper 6 is attached to the area of a rectangular-shaped part 2' on the rectangular bottom part 2. The back side of the decorative paper 6 is coated with sticking glue L facing the upper center side of the upper horizontal strip 5 and with release glue R4 for the other back side. The back side of the decorative paper 6 has a finger slot 9 in the center along a lower edge 2b of the rectangular bottom part 2. This allows the decorative paper 6 to be peeled off vertically for easy opening.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a packaging bag for storing, for example, powder or granular material. [Background technology]

[0002] Conventionally, the easy-to-open paper bag of Patent Document 1 has a structure in which the corner bottom of the paper bag (a corner bottom having triangular parts on the left and right, with the lower horizontal piece folded upward from the lower horizontal crease and the upper horizontal piece folded downward from the upper horizontal crease and glued) is closed from above with decorative paper. Patent Document 1 has a structure in which release adhesive is applied in multiple lines to the backside of the decorative paper of a normal corner bottom, there is a folded part on one of the short sides, and the decorative paper is attached to the corner bottom with release adhesive. When opening, the decorative paper is peeled off horizontally from the folded part on the short side.

[0003] Patent Document 2 is a powder packaging bag, in which adhesive is applied horizontally above and below the corner bottom, and decorative paper that is longer in the horizontal direction than conventional paper is attached thereto, and the left and right protruding pieces on both sides are folded down. When opening the bag, for example, it is necessary to peel off the decorative paper horizontally from the left protruding piece. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-107689 A [Patent Document 2] Utility Model Registration No. 3059804 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the easy-to-open paper bag of Patent Document 1, after the decorative paper is opened horizontally, the angular bottom portion is glued, so that the upper horizontal piece of the angular bottom portion must be opened upward and the lower horizontal piece of the angular bottom portion must be opened downward. This requires three actions: opening the decorative paper horizontally, opening the upper horizontal piece, and opening the lower horizontal piece. In addition, there is the problem that the decorative paper will come off the angular bottom portion and become waste.

[0006] In addition, with the product of Patent Document 2, when the decorative paper is peeled off horizontally, due to the position of the adhesive, the upper and lower horizontal pieces of the glued bottom corner cannot be opened, so three actions are required: opening the lower horizontal piece and then opening the upper horizontal piece, and there is the problem that the decorative paper will come off the bottom corner and become waste.

[0007] Furthermore, cutting the decorative paper horizontally into top and bottom pieces with a cutting tape, and then opening the upper horizontal piece upward and the lower horizontal piece downward, requires three actions, the cutting tape becomes waste, and when the decorative paper is cut vertically and horizontally, paper pieces are generated that may get inside the packaging bag.

[0008] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a packaging bag in which the decorative paper does not become waste by applying separate adhesives and peeling adhesives to the back surface of the decorative paper. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides First (first embodiment, see Figs. 3 and 4), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is bent upward along the lower horizontal line (T1), the upper horizontal piece (5) is bent downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and the central In a packaging bag (1) having a rectangular portion (2') and an angular bottom portion (2) in which left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular portion (2'), release adhesive (R1, R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and release adhesive (R2, R3) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). a peelable adhesive (R3) is applied horizontally to the surface of the lateral edge (5b) of the upper horizontal piece (5); the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2); and a rectangular decorative piece (6) is affixed to the area of ​​the rectangular portion (2') on the angular bottom portion (2); the back surface (6") of the decorative piece (6) is applied with adhesive adhesive (L) facing the center of the upper horizontal piece (5), and the rest of the back surface (6") is applied with peelable adhesive (R4); and further, the back surface (6") of the decorative piece (6) has a finger insertion portion (9) along the lower edge (2b) of the angular bottom portion (2) where peelable adhesive (R4) is not applied.

[0010] In the embodiment, the decorative piece (6) is, for example, decorative paper (6). With this configuration, when opening the packaging bag (1), inserting a finger into the finger insertion portion (9) of the decorative piece (6) and peeling the decorative piece (6) upward causes the upper horizontal piece (5) to open, which adheres to the decorative piece (6). After that, the packaging bag (1) can be opened by peeling the lower horizontal piece (4) downward. This action is a two-action operation, and the operation is simple. Since the decorative piece (6) adheres to the corner bottom portion (2), the decorative piece (6) does not become waste, and since no cutting tape is used, no cutting tape waste is generated, and since the decorative piece (6) is not cut, there is no risk of the paper piece entering the inside of the packaging bag (1).

[0011] Secondly (second embodiment, see Figs. 7 and 8), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is bent upward along the lower horizontal line (T1), the upper horizontal piece (5) is bent downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a rectangular portion in the center In a packaging bag (1) having an angular bottom portion (2) in which the left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular portion (2'), release glue (R1, R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), release glue (R2, R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), The packaging bag is configured in such a manner that release adhesive (R3) is applied horizontally to the surface of the lateral edge (5b) of the side lateral piece (5), the upper lateral piece (5) and the lower lateral piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2), and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2), the back surface (6") of the decorative piece (6) is applied with adhesive adhesive (L) in an inverted trapezoidal shape facing the lower half of the upper lateral piece (5), including the portion along the lateral edge (5b) of the upper lateral piece (5), and the remaining portion is applied with release adhesive (R4), and further, the back surface (6") of the decorative piece (6) is provided with a finger insertion portion (9) along the lower edge (2b) of the angular bottom portion (2) where release adhesive (R4) is not applied.

[0012] With this configuration, when opening the packaging bag (1), inserting a finger into the finger insertion portion (9) of the decorative piece (6) and peeling the decorative piece (6) upward causes the upper horizontal piece (5) to open, which adheres to the decorative piece (6), and then peeling the lower horizontal piece (4) downward allows the packaging bag (1) to be opened. This action is a two-action operation, and the operation is simple; since the decorative piece (6) adheres to the corner bottom portion (2), the decorative piece (6) does not become waste; since no cutting tape is used, no cutting tape waste is generated; and since the decorative piece (6) is not cut, there is no risk of paper pieces getting inside the packaging bag (1).

[0013] Thirdly (third embodiment, see Figs. 9 and 10), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is bent upward along the lower horizontal line (T1), the upper horizontal piece (5) is bent downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a central rectangle is formed. In a packaging bag (1) having a rectangular-shaped portion (2') and an angular bottom portion (2) in which left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular-shaped portion (2'), release glue (R1, R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and release glue (R2, R2) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). a peel-off adhesive (R3) is applied horizontally to the surface of the lateral edge (5b) of the upper lateral piece (5); the upper lateral piece (5) and the lower lateral piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2); and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2); the back surface (6") of the decorative piece (6) is applied with adhesive adhesive (L) so as not to extend over the lower half of the lower lateral piece (4) and the lateral edge (5b) of the upper lateral piece (5), and the other portions are applied with peel-off adhesive (R4); and further, the back surface (6") of the decorative piece (6) is provided with a finger insertion portion (9) along the upper edge (2a) of the angular bottom portion (2) where peel-off adhesive (R4) is not applied.

[0014] With this configuration, when opening the packaging bag (1), inserting a finger into the upper finger insertion portion (9) of the decorative piece (6) and peeling the decorative piece (6) downward causes the back surface (6") of the decorative piece 6 and the upper horizontal piece (5) to peel off relatively easily since they are adhered to each other by the peelable adhesive (R4). The decorative piece (6) up to the fixed adhesive (L) is then peeled off from the upper horizontal piece (5). Thereafter, the upper horizontal piece (5) is opened upward from its horizontal edge (5b) and the decorative piece (6) is pulled downward. The lower horizontal piece (4) is opened together with the lower horizontal piece (4) to open the opening (1'). This operation is approximately three actions, and is the same as the conventional method, but since the decorative piece (6) is attached to the corner bottom portion (2), no waste is generated from the decorative piece (6), and since no cutting tape is used, no waste is generated from the cutting tape. Furthermore, since the decorative piece (6) is not cut, there is no risk of paper pieces entering the inside of the packaging bag (1).

[0015] Fourthly (fourth embodiment, see Figs. 13 and 14), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is bent upward along the lower horizontal line (T1), the upper horizontal piece (5) is bent downward along the upper horizontal line (T2), an overlapping portion (S2) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and the central long portion (S3) is bent downward along the upper horizontal line (T2). In a packaging bag (1) having a square bottom (2) with left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) formed on the left and right sides of a square portion (2') and the rectangular portion (2'), release glue (R1, R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and release glue (R2, R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). and the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2), the overlapping portion (S2) is formed to have a vertical width narrower than the overlapping portion (S1) described in any one of the first to third above, and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2), the back surface 6" of the decorative piece (6) is applied with adhesive glue (L) facing the center of the upper horizontal piece (5), and the rest of the back surface (6") is applied with release glue (R4), and further, the back surface (6") of the decorative piece (6) is provided with a finger insertion portion (9) along the lower edge (2b) of the angular bottom portion (2) where release glue (R4) is not applied.

[0016] In this configuration, the overlapping portion (S2) is formed narrower in the vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, so that the area of ​​the peelable adhesive (R4) of the decorative paper (6) that adheres from the horizontal edge (5b) of the upper horizontal piece (5) to the lower edge (4d) of the lower horizontal piece (4) expands in the vertical direction, improving the adhesive strength, eliminating the need for the horizontal peelable adhesive (R3) provided in the first to third embodiments, and improving the ease of opening. In addition, when opening the packaging bag (1), if a finger is inserted into the finger insertion portion (9) at the lower side of the decorative piece (6) and the decorative piece (6) is peeled upward, the finger will stick to the decorative piece (6) and the upper horizontal piece (5) will open, and then the packaging bag (1) can be opened by peeling the lower horizontal piece (4) downward. This operation is a two-action operation, and the operation is simple. Since the decorative piece (6) is attached to the corner bottom (2), no waste is generated from the decorative piece (6). Since no cutting tape is used, no waste is generated from the cutting tape. Since the decorative piece (6) is not cut, there is no risk of the paper piece getting into the inside of the packaging bag (1). In addition, since no peeling adhesive (R3) is provided between the upper horizontal piece (5) and the lower horizontal piece (4), the ease of opening can be improved.

[0017] Fifthly (fifth embodiment, see Figs. 16 and 17), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a rectangular portion in the center In a packaging bag (1) having a rectangular bottom (2) with left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) formed on the left and right sides of the rectangular portion (2'), a release glue (R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), and a release glue (R3) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). The packaging bag is configured in such a manner that release adhesive (R3) is applied horizontally to the surface of the edge (5b), the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2), and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2), the back surface (6") of the decorative piece (6) has a predetermined range of adhesive adhesive (L) applied in the vertical direction at least along the right side (6d) or the left side (6c) of the decorative piece (6) and the remaining portion is applied with release adhesive (R4), and further, the back surface (6") of the decorative piece (6) has a finger insertion portion (9) along the left edge (2c) or the right edge (2d) of the rectangular portion (2') of the angular bottom portion (2) where release adhesive (R4) is not applied.

[0018] With this configuration, when the decorative piece (6) is peeled off laterally from the finger insertion portion (9) on the right side (6d) or the left side (6c), the decorative piece (6) up to the fixed glue (L) is peeled off, and the decorative piece (6) remains attached to the corner bottom portion (2) by the fixed glue (L) without being separated, so that the upper horizontal piece (5) can be opened upward and the lower horizontal piece (4) can be opened downward (in either order; the lower horizontal piece (4) can be opened first and the upper horizontal piece (5) can be opened later), and the packaging bag (1) can be opened. This operation is approximately three actions and is the same as the conventional one, but since no cutting tape is used and the decorative piece is not separated, no waste is generated, and since the decorative piece (6) is not cut, there is no risk of paper pieces entering the inside of the packaging bag (1).

[0019] Sixth (fifth embodiment), the overlapping portion (S2) is formed to have a narrower vertical width than the first to third overlapping portions (S1), and is configured as the packaging bag described in the fifth embodiment in which the release adhesive (R3) is not applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5).

[0020] When configured in this manner, the overlapping portion (S2) is formed with a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the release adhesive (R4) of the decorative piece (6) bonds almost the entire area of ​​the upper horizontal piece (5) and the lower horizontal piece (4). This improves the adhesive strength of the release adhesive (R4) compared to the first embodiment, eliminating the need to provide the horizontal release adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0021] Seventhly (sixth embodiment, see Figs. 19 and 20), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and the central rectangular portion (2') and the rectangular portion (2') are folded upward along the upper horizontal line (T3). In a packaging bag (1) having an angular bottom portion (2) on the left and right of which the left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed, a release glue (R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), a release glue (R3) is applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5), and The lower horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the corner bottom portion (2), and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the corner bottom portion (2). The decorative piece (6) has a perforation (8) formed in the vertical direction or in a diagonal direction to the vertical direction, dividing the decorative piece (6) into two parts, left and right, and the decorative piece (6) The back surface (6") of the decorative piece (6) is configured as a packaging bag in which adhesive glue (L, L) is applied at least in a predetermined range in the vertical direction along the right side (6d) and left side (6c) of the decorative piece (6), and release glue (R4) is applied to the remaining parts. Furthermore, the back surface (6") of the decorative piece (6) is configured as a packaging bag in which a finger insertion portion (9) where release glue (R4) is not applied is provided at the end of the perforation (8) along the lower edge (2b) or upper edge (2a) of the corner bottom portion (2).

[0022] With this configuration, when the perforations (8) of the decorative piece (6) are cut vertically and the decorative pieces (6) (6e, 6f) are peeled off to the left and right, the left and right decorative pieces (6) (6e, 6f) are peeled off to the left and right adhesives (L, L), and the adhesives (L) stop the opening of the decorative pieces (6) (6e, 6f). After that, the upper horizontal piece (5) is opened upward and the lower horizontal piece (4) is opened downward (in either order). This operation is approximately three actions, and is the same as the conventional one. However, since the opened decorative pieces (6) (6e, 6f) are attached to the corner bottoms (2), no waste is generated from the decorative pieces (6), and since no cutting tape is used, no waste is generated from the cutting tape. In addition, since the decorative pieces (6) do not separate horizontally, the generation of paper scraps can be minimized.

[0023] Eighth (sixth embodiment), the overlapping portion (S2) is formed to have a narrower vertical width than the overlapping portion (S1) described in the first to third embodiments, and is configured as a packaging bag described in the seventh embodiment in which the release adhesive (R3) is not applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5).

[0024] When configured in this manner, the overlapping portion (S2) is formed with a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the release adhesive (R4) of the decorative piece (6) bonds almost the entire area of ​​the upper horizontal piece (5) and the lower horizontal piece (4). This improves the adhesive strength of the release adhesive (R4), eliminating the need for the horizontal release adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0025] Ninth (sixth embodiment), the finger insertion portion (9) is formed by the packaging bag described in the seventh or eighth embodiment, in which a finger insertion portion (9) not coated with the release adhesive (R4) is provided on the back surface (6") side of the decorative piece (6) along the perforation (8) instead of the lower edge (2b) or upper edge (2a) of the corner bottom portion (2).

[0026] With this configuration, a finger insertion section (9) is provided, for example, in the center of the perforation (8), so that the perforation (8) can be torn from the center of the perforation (8) and the decorative piece (6) can be divided into two in the left-right direction from the finger insertion section (9), and then the packaging bag can be opened by, for example, opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward (the order of the upper horizontal piece (5) and the lower horizontal piece (4) does not matter). At this time, the decorative piece (6) opens to the left and right, but since it is stopped by the adhesive (L, L), the decorative pieces (6) (6e, 6f) do not become waste.

[0027] Tenthly (seventh embodiment, see FIG. 22), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), and the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), forming an overlapping portion (S1) between the upper horizontal piece (5) and the lower horizontal piece (4), and the central rectangular portion (2') and the outer left and right sides of the large isosceles triangular portion on the left and right sides of the rectangular portion (2') are overlapped with each other. In a packaging bag (1) having an angular bottom portion (2) on which side triangular portions (3', 3') are respectively formed, a release glue (R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), a release glue (R3) is applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5), and The horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2), and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2). The decorative piece (6) has a perforation (8) formed below the horizontal edge (5b) of the upper horizontal piece (5) that divides the decorative piece (6) horizontally into two parts, upper and lower, and the back surface (6") of the decorative piece (6) is coated with adhesive glue (L) in the center of the upper horizontal piece (5) and with release glue (R4) in the remaining part. Furthermore, the back surface of the decorative piece (6) is provided with a finger insertion portion (9) along the perforation (8) where release glue (R4) is not applied.

[0028] With this configuration, when the decorative piece (6) is divided into two parts, top and bottom, by tearing the perforation (8) at the finger insertion section (9) along the perforation (8) of the decorative piece (6) in the vertical direction, the packaging bag can be opened by opening the upper horizontal piece (5) upward along the horizontal edge (5b) of the lower horizontal piece (5) and opening the lower horizontal piece (4) downward. In this case, the decorative piece (6) does not become waste, and since no cutting tape is used, the cutting tape does not become waste.

[0029] Eleventh (seventh embodiment, see FIG. 21), large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a central rectangular portion (2' In a packaging bag (1) having a rectangular portion (2') and a corner bottom portion (2) on which left and right outer triangular portions (3', 3') of the large isosceles triangle portion are formed on the left and right sides of the rectangular portion (2'), a release glue (R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), and a release glue (R2) is applied to the surface of the horizontal edge (5b) of the upper horizontal piece (5). a peel-off adhesive (R3) applied horizontally to the surface of the decorative piece (6) and a rectangular bottom portion (2) formed by folding and adhering the upper horizontal piece (5) and the lower horizontal piece (4) along the lower horizontal line (T1) and the upper horizontal line (T2) as described above, and a rectangular decorative piece (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2), the decorative piece (6) has a perforation (8) formed in it that divides the decorative piece (6) into two inverted trapezoidal parts similar to the upper horizontal piece (5), the back surface (6") of the decorative piece (6) has adhesive adhesive (L) applied to the center of the upper horizontal piece (5) and peel-off adhesive (R4) applied to the remaining part, and further the back surface (6") of the decorative piece (6) has a finger insertion portion (9) along the perforation (8) where peel-off adhesive (R4) is not applied.

[0030] With this configuration, when the decorative piece (6) is divided into two parts, top and bottom, by tearing the perforation (8) at the finger insertion section (9) along the perforation (8) of the decorative piece (6) in the vertical direction, the packaging bag can be opened by opening the upper horizontal piece (5) upward along the horizontal edge (5b) of the lower horizontal piece (5) and opening the lower horizontal piece (4) downward. In this case, the decorative piece (6) does not become waste, and since no cutting tape is used, the cutting tape does not become waste.

[0031] Twelfthly (eighth embodiment, see FIG. 23), the packaging bag is configured as any one of the seventh to eleventh embodiments, in which, in addition to the finger insertion portion (9), a cut (11a or 11b) is provided in the cosmetic piece (6) in the finger insertion portion (9) where the peel-off adhesive (R4) of the cosmetic piece (6) is not applied.

[0032] With this configuration, the notch (11a or 11b) of the decorative piece (6) serves as a handle, making it easier to tear the perforation (8).

[0033] Thirteenth (seventh embodiment, see Figures 21 and 22), the decorative piece (6) is configured to be a packaging bag as described in any one of the above-mentioned tenth to twelfth embodiments, in which, when attached to the rectangular portion (2') of the corner bottom portion (2), an adhesive glue (L) is applied to the center portion of the upper horizontal piece (5), an adhesive glue (L) is applied to a portion of the lower horizontal piece (4), and a peel-off glue (R4) is applied to the remaining portions.

[0034] With this configuration, the divided lower part of the decorative piece (6) is adhered to the lower horizontal piece (4) with adhesive (L) and sticks to the lower horizontal piece (4) and does not come off, so the decorative piece (6) does not become garbage.

[0035] Fourteenthly (sixth to eighth embodiments), the packaging bag is configured as described in any one of the seventh to thirteenth embodiments, characterized in that the perforation (8) is one line.

[0036] With this configuration, since there is only one perforation (8), when the perforation (8) is torn, the decorative piece (6) does not become waste, and the cut tape does not become waste.

[0037] Fifteenth (ninth embodiment, see FIG. 15), the decorative piece (6) is configured by any one of the packaging bags described in the first to sixth above, in which, in the back surface (6") of the decorative piece (6), instead of the finger insertion portion (9) to which the release adhesive (R4) is not applied, a protruding piece (10) to which the release adhesive (R4) is not applied is provided.

[0038] With this configuration, the finger insertion section (9) is replaced by a protruding piece (10) on which no peeling adhesive (R4) is applied, so that the decorative paper (6) can be easily peeled off from the protruding piece (10). Effect of the Invention

[0039] According to the present invention, when opening the packaging bag (1), inserting a finger into the finger insertion portion (9) of the decorative piece (6) and peeling the decorative piece (6) upward (peel it in a direction perpendicular to the longitudinal direction of the decorative piece (6)), the upper horizontal piece (5) sticks to the decorative piece (6) and opens, and then the packaging bag (1) can be opened by pulling the lower horizontal piece (4) downward. This action is a two-action operation, and the operation is simple, and since the decorative piece (6) sticks to the corner bottom portion (2), the decorative piece (6) does not become waste, and since no cutting tape is used, no cutting tape waste is generated, and since the decorative piece (6) is not cut, there is no risk of paper pieces getting inside the packaging bag (1).

[0040] In addition, when opening the packaging bag (1), inserting a finger into the upper finger insertion portion (9) of the decorative piece (6) and peeling the decorative piece (6) downward (peel in a direction perpendicular to the longitudinal direction of the decorative piece (6)), the back surface (6") of the decorative piece 6 and the upper horizontal piece (5) are adhered with peelable adhesive (R4), so they peel off relatively easily, and the decorative piece (6) up to the fixed adhesive (L) is peeled off from the upper horizontal piece (5). Thereafter, the upper horizontal piece (5) is opened upward from its lateral edge (5b), and the decorative piece (6) is peeled downward (peel in a direction perpendicular to the longitudinal direction of the decorative piece (6). The decorative piece (6) is pulled in a direction perpendicular to the longitudinal direction of the decorative piece (6) to open the lower horizontal piece (4) together with the lower horizontal piece (4), thereby opening the opening (1'). This operation involves three actions and is the same as the conventional method, but since the decorative piece (6) is attached to the corner bottom (2), the decorative piece (6) does not become waste, and since no cutting tape is used, no cutting tape waste is generated, and since the decorative piece (6) is not cut, there is no risk of paper pieces entering the inside of the packaging bag (1).

[0041] In addition, since the overlapping portion (S2) is formed narrower in the vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, the adhesive strength is improved by expanding the area of ​​the peelable adhesive (R4) of the decorative piece (6) that adheres from the horizontal edge (5b) of the upper horizontal piece (5) to the lower edge (4d) of the lower horizontal piece (4) in the vertical direction, and therefore the horizontal peelable adhesive (R3) provided in the first to third embodiments is not required, improving the ease of opening. In addition, when opening the packaging bag (1), if a finger is inserted into the finger insertion portion (9) of the decorative piece (6) and the decorative piece (6) is peeled upward, the finger adheres to the decorative piece (6) and the upper horizontal piece (5) opens, and then the packaging bag (1) can be opened by peeling the lower horizontal piece (4) downward. This operation is a two-action operation, and the operation is simple. Since the decorative piece (6) is attached to the corner bottom (2), the decorative piece (6) does not become waste. Since no cutting tape is used, no cutting tape waste is generated. Since the decorative piece (6) is not cut, there is no risk of the paper piece getting into the inside of the packaging bag (1). In addition, since no peeling adhesive (R3) is provided between the upper horizontal piece (5) and the lower horizontal piece (4), the ease of opening can be improved.

[0042] In addition, when the decorative piece (6) is peeled off laterally from the finger insertion portion (9) on the right side (6d) or the left side (6c), the decorative piece (6) up to the fixed glue (L) is peeled off, and since the decorative piece (6) remains attached to the corner bottom portion (2) without being separated by the fixed glue (L), the upper horizontal piece (5) can then be opened upward and the lower horizontal piece (4) can be opened downward (the order of the upper horizontal piece (5) and the lower horizontal piece (4) does not matter), and the packaging bag (1) can be opened. This operation is three actions and is the same as the conventional one, but since no cutting tape is used and the decorative piece is not separated, no waste is generated, and since the decorative piece (6) is not cut, there is no risk of paper pieces entering the inside of the packaging bag (1).

[0043] In addition, the overlapping portion (S2) is formed with a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the release adhesive (R4) of the decorative piece (6) adheres almost the entire area of ​​the upper horizontal piece (5) and the lower horizontal piece (4). This improves the adhesive strength of the release adhesive (R4), eliminating the need for the horizontal release adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0044] In addition, when the perforation (8) of the decorative piece (6) is cut vertically and the decorative piece (6) is peeled to the left and right, the left and right decorative pieces (6) are peeled to the left and right adhesive (L, L), and the opening of the decorative piece (6) is stopped by the adhesive (L, L), so that the packaging bag (1) can be opened by opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward (the order of the upper horizontal piece (5) and the lower horizontal piece (4) does not matter). This operation is about three actions and is the same as the conventional one, but there is an advantage that no waste is generated because no cutting tape is used and the decorative piece (6) is not separated.

[0045] In addition, the overlapping portion (S2) is formed to have a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the release adhesive (R4) of the decorative piece (6) adheres almost the entire area of ​​the upper horizontal piece (5) and the lower horizontal piece (4). This improves the adhesive strength of the release adhesive (R4), eliminating the need for the horizontal release adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0046] In addition, since a finger insertion section (9) is provided, for example, in the center of the perforation (8), the perforation (8) can be torn from the center of the perforation (8) and the decorative piece (6) can be divided into two in the left-right direction from the finger insertion section (9), and then the packaging bag can be opened by opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward (the order of the upper horizontal piece (5) and the lower horizontal piece (4) does not matter). At this time, the decorative piece (6) opens to the left and right, but since it is stopped by the adhesive (L, L), the decorative piece (6) does not become waste.

[0047] Also, if the decorative piece (6) is divided into two parts, top and bottom, by tearing the perforation (8) at the finger insertion section (9) along the perforation (8) of the decorative piece (6) and vertically dividing the decorative piece (6) into two halves, top and bottom, the packaging bag can be opened by opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward along the horizontal edge (5b) of the lower horizontal piece (5) (the order of the upper horizontal piece (5) and the lower horizontal piece (4) does not matter). In this case, the decorative piece (6) does not become waste, and since no cutting tape is used, the cutting tape does not become waste.

[0048] In addition, the notch (11a or 11b) of the decorative piece (6) serves as a handle, making it easier to tear the perforation (8).

[0049] In addition, the divided lower part of the decorative piece (6) is adhered to the lower horizontal piece (4) with adhesive (L) and does not come off from the lower horizontal piece (4), so that the decorative piece (6) does not become garbage.

[0050] In addition, since there is only one perforation (8), when the perforation (8) is torn, the decorative piece (6) does not become waste, and the cut tape does not become waste.

[0051] Moreover, since a protruding piece (10) on which no peeling adhesive (R4) is applied is provided in place of the finger insertion portion (9), the decorative piece (6) can be easily peeled off from the protruding piece (10). [Brief description of the drawings]

[0052] [Figure 1] 1 is a front view of a packaging bag according to the present invention with a large isosceles triangle portion formed at the opening thereof. FIG. [Diagram 2] FIG. 2 is a front view showing the square bottom of the packaging bag. [Diagram 3] FIG. 2 is a front view showing the square bottom portion and decorative paper of the packaging bag (first embodiment). [Figure 4] FIG. 2 is a front view showing the state in which decorative paper has been attached to the corner bottom portion of the packaging bag. [Diagram 5]FIG. 2 is a front view showing the state in which decorative paper has been attached to the corner bottom portion of the packaging bag. [Figure 6] FIG. 2 is a front view showing the state in which the decorative paper has been peeled off from the corner bottom of the packaging bag. [Figure 7] FIG. 4 is a front view showing the square bottom portion and decorative paper of the packaging bag (second embodiment). [Figure 8] FIG. 2 is a front view showing the state in which decorative paper has been attached to the corner bottom portion of the packaging bag. [Figure 9] FIG. 2 is a front view showing the square bottom portion and decorative paper of the packaging bag (third embodiment). [Figure 10] FIG. 2 is a front view showing the state in which decorative paper has been attached to the corner bottom portion of the packaging bag. [Figure 11] FIG. 2 is a front view showing the state in which the decorative paper has been peeled off from the corner bottom of the packaging bag. [Figure 12] FIG. 11 is a front view of the packaging bag with a large isosceles triangle portion formed at the opening (fourth embodiment). [Figure 13] FIG. 2 is a front view showing the square bottom portion and decorative paper of the packaging bag. [Figure 14] FIG. 2 is a front view showing the state in which decorative paper has been attached to the corner bottom portion of the packaging bag. [Figure 15] FIG. 13(a) is a front view of the cosmetic paper (ninth embodiment) showing another pattern of the finger insertion section of the cosmetic paper, and (b) is a front view of the cosmetic paper showing the protruding pieces of the cosmetic paper. [Figure 16] 11(a) to 11(d) are front views showing a fifth embodiment of the decorative paper in the packaging bag. [Figure 17] 1(a) to 1(d) are front views showing the state in which decorative paper is attached to the square bottom portion of the packaging bag. [Figure 18] FIG. 4 is a front view showing the state in which the decorative paper is peeled off laterally in the packaging bag. [Figure 19] FIG. 13(a) is a front view showing a sixth embodiment of the decorative paper in the same packaging bag, and FIG. 13(b) is a front view showing the same decorative paper attached to the corner bottom portion. [Figure 20] FIG. 4 is a front view showing the state in which the decorative paper is peeled off in the left-right direction in the packaging bag. [Figure 21] In the same packaging bag, (a) is a front view showing a seventh embodiment of the decorative paper, and (b) and (c) are front views showing the state in which the decorative paper is attached to the corner bottom portion. [Figure 22] In the same packaging bag, (a) is a front view showing a seventh embodiment of the decorative paper, and (b) and (c) are front views showing the decorative paper attached to the corner bottom portion. [Diagram 23] In the same packaging bag, (a) is a front view showing a state in which a slit is made in the decorative paper (eighth embodiment), and (b) is a front view showing a state in which the slit of the decorative paper (eighth embodiment) has been raised. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0053] Hereinafter, the packaging bag 1 according to the present invention will be described in detail with reference to the accompanying drawings. In addition, in Fig. 1 and Fig. 2, the left and right sides of the paper are defined as "left direction", "right direction", or "horizontal direction", the top and bottom are defined as "upward direction", "downward direction", or "vertical direction" based on the left and right direction (horizontal direction), the front side of the paper is defined as "front side", and the back side of the paper is defined as "back side" (the same applies to other figures). In Fig. 1, the left and right large isosceles triangular parts 3, 3 are coated with release adhesives R1, R1, R2, R2, R3, etc. on the front side, but in Fig. 2, by folding, the release adhesives R1, R2, R2, R2, R3 become the back side and are adhered to the front side (release adhesives R1, R2) of the large isosceles triangular parts 3, 3 and the front side (release adhesive R3) of the lower horizontal piece 4. In addition, for the rectangular decorative paper 6 (decorative piece 6) and the corner bottom part 2, the horizontal direction is defined as the long direction, and the vertical direction is defined as the short direction.

[0054] In addition, in the embodiment, the decorative paper 6 is referred to as "decorative paper 6" and the material is kraft paper, but since materials other than paper also exist, the claims refer to it as "decorative piece 6." Also, the packaging bag is, for example, a heavy-duty packaging bag made of kraft paper, but since plastic bags also exist, the term "paper packaging bag" is not used, but rather, it is referred to as a packaging bag.

[0055] (First embodiment) Figs. 3 and 4 As shown in FIG. 1, a packaging bag 1 (material is, for example, kraft paper, with a basis weight of, for example, 75 g / m 2 At the top opening (opening) 1' (where the edge of the front side paper overlaps with the edge of the back side paper. This is where the envelope is opened; top horizontal line 1"), first, the left and right parts of the top opening 1' are folded into the shape of a large isosceles triangle 3, 3 so that the outer vertices become the apexes 3a, 3a, respectively, and then the inverted trapezoidal lower horizontal piece 4 is folded upward along the lower horizontal line T1 (a position that approximately bisects the lower sides of the left and right large isosceles triangles 3, 3) (when folded upward, the lower horizontal piece 4 becomes a trapezoid. See FIG. 2), and then the upper horizontal line T2 (the left and right The trapezoidal upper horizontal piece 5 is folded downward along the position that approximately bisects the upper sides of the large isosceles triangle portions 3,3 (when folded downward, the upper horizontal piece 5 will have an inverted trapezoidal shape; see Figure 2). In this case, the lower horizontal piece 4 is at the bottom and the upper horizontal piece 5 is at the top, and the lower horizontal piece 4 and upper horizontal piece 5 overlap vertically, forming an overlapping portion S1 (e.g., S1 = 30 mm) (see Figure 2). By constructing in this manner, the angular bottom portion 2 shown in Figure 2 is formed. The overlapping of the upper horizontal piece 5 and lower horizontal piece 4 may be reversed.

[0056] Incidentally, the packaging bag 1 is made by overlapping, for example, two, three, four, etc. layers of kraft paper and bonding the upper edges together with adhesive (for example, in the case of two layers, the upper edges (periphery) are bonded with adhesive to form a single sheet), which is a well-known technique.

[0057] Here, as shown in FIG. 1, the release glue R1, R1 is applied in a right-angled triangular shape to the surface side of the left and right right-angled triangular parts 4a, 4a of the lower horizontal piece 4 below the lower horizontal line T1, and the release glue R2, R2 is applied in a right-angled triangular shape to the surface side of the left and right right-angled triangular parts 5a, 5a of the upper horizontal piece 5 above the upper horizontal line T2. In addition, a horizontal linear release glue R3 is applied to the surface along the upper horizontal horizontal edge 5b of the upper horizontal piece 5. The vertical width of the release glue R3 is, for example, about 10 mm. Both ends of this release glue R3 reach the release glue R2, R2. Although there is a slight gap between the upper side of the release glue R3 and the horizontal edge 5b, there is no need to provide a gap.

[0058] Then, by folding the lower horizontal piece 4 upward along the lower horizontal line T1, the right-angled triangular peel-off adhesive R1, R1 is adhered to each surface side of the left and right lower halves of the large isosceles triangle portions 3, 3 (right-angled triangular portions 4a, 4a, peel-off adhesive R1, R1 in Figure 2), and the lower horizontal piece 4 is adhered to the lower half of the large isosceles triangle portions 3, 3 (see Figure 2).

[0059] Furthermore, by folding the upper horizontal piece 5 downward along the upper horizontal line T2, the right-angled triangular release adhesive R2, R2 is adhered to each surface side of the upper left and right halves of the large isosceles triangle portions 3, 3 (right-angled triangular portions 5a, 5a, release adhesive R2, R2 in Figure 2), thereby adhering the upper horizontal piece 5 to the upper half of the large isosceles triangle portions 3, 3 (see Figure 2), and the release adhesive R3 on the back side of the upper horizontal piece 5 along the horizontal edge 5b is adhered to the surface of the lower horizontal piece 4 (see Figure 2).

[0060] At this time, the left and right vertices 3a, 3a of the large isosceles triangle portion 3, 3 and the inner vertices 3b, 3b formed by the upper horizontal piece 5 and the lower horizontal piece 4 are configured to be at the same level in the left-right direction.

[0061] The rectangular portion formed by the upper edge 2a and lower edge 2b of the above-mentioned angular bottom portion 2 and the vertical two-dot chain lines 7, 7 connecting both ends of the upper edge 2a and the lower edge 2b is called the rectangular portion 2'. The left and right triangular portions on the outer side of the above-mentioned two-dot chain lines 7, 7 are called the outer triangular portions 3', 3', and the left and right triangular portions on the inner side of the above-mentioned two-dot chain lines 7, 7 are called the inner triangular portions 3", 3". The angular bottom portion 2 of the packaging bag 1 is formed as described above.

[0062] Next, decorative paper 6 (e.g., kraft paper, e.g., 75 g / m 2 3 and 4, the decorative paper 6 has no adhesive applied to its front surface 6', but has adhesive adhesive L and release adhesive R4 applied to its back surface 6''.

[0063] Here, the adhesive glue L is a glue with strong adhesive power, for example, a vinyl acetate resin adhesive and other adhesives with strong adhesive power. The peelable peelable glue R4 (similar to the above peelable glues R1 to R3) refers to an adhesive with peeling performance, for example, a mixture of a vinyl acetate resin adhesive and wax. For example, adhesives with peeling performance include those with 5% to 15% vinyl acetate resin adhesive, 5% to 15% acrylic resin adhesive, 5% to 15% wax, and the total components of the vinyl acetate resin adhesive, the acrylic resin adhesive, and the wax are 25% to 35%. The rest of the adhesives function as peelable glues, including those with 65% (when the total components are 35%) to 75% (when the total components are 25%) water. It is also possible to use a peelable glue with other component % as the peelable glue. The peelable glue as an adhesive is general and not particularly special.

[0064] The release glue R1 to R3 used for the corner bottom 2 may be the same as the release glue R4 used for the decorative paper 6, but the release glue R4 used for the decorative paper 6 may have a stronger adhesive strength than the release glues R1 to R3 (lower adhesive strength than the adhesive glue L). To increase the adhesive strength of the release glue R4, for example, the vinyl acetate resin adhesive is 10% to 20%, the wax is 5% to 15%, the total component of the vinyl acetate resin adhesive and the wax is 25% to 35%, and the rest is water 65% (when the total component is 35%) to 75% (when the total component is 25%). Since the adhesive strength of the acrylic resin adhesive is weak, the adhesive strength is increased by making the vinyl acetate resin adhesive 10% to 20% even if the wax component is the same. The release glues R1 to R4 are known technologies and are not particularly special.

[0065] In addition, the term "adhesive glue" refers to a glue that has a strong adhesive strength such that, for example, when kraft papers are bonded together, the two kraft papers cannot be peeled off even after the passage of time, and the term "peeling glue" refers to a glue that, for example, when kraft papers are bonded together, can withstand the drop test of "JIS 0217 1998" described in the examples even after the passage of time, does not break, and does not leak, for example, powder or granular materials inside, but has a weak adhesive strength such that when the decorative paper 6 is peeled off from the finger insertion area 9, it can be peeled off from the surface of the lower corner bottom portion 2.

[0066] The size of the decorative paper 6 is approximately the same as that of the rectangular portion 2'. That is, the width of the decorative paper 6 is approximately the same as the width a1 of the square bottom portion 2 (see FIG. 3), and the length of the decorative paper 6 is approximately the same as the length a2 of the square bottom portion 2, forming a rectangle as a whole (e.g., a1=400 mm, a2=90 mm).

[0067] The adhesive L on the back surface 6" of the decorative paper 6 is the same length on both sides of the center line P of the decorative paper 6, and when it is attached to the corner bottom 2, it is applied so that it is positioned corresponding to the upper surface of the center of the upper horizontal piece 5, and release adhesive R4 is applied to the other parts (parts other than the adhesive L of the rectangular part 2'). Therefore, when the decorative paper 6 is adhered to the corner bottom 2 (rectangular part 2') with its back surface 6", the adhesive L is adhered to the upper surface of the center of the upper horizontal piece 5 (see Figure 4), and release adhesive R4 is adhered to the other parts. Therefore, when the decorative paper 6 is pulled upward (in the direction of arrow A, see Figure 5) from the finger insertion part 9 described below, the release adhesives R2 and R3 are peeled off, and since the adhesive L adhered to the upper horizontal piece 5 is strongly adhered, the decorative paper 6 has the function of being able to be opened together with the upper horizontal piece 5.

[0068] As an example, as shown in Figures 3 and 4, adhesive glue L is applied in a rectangular shape along the upper side 6a of the back surface 6" of the decorative paper 6, covering approximately 53% of the horizontal width a1 of the rectangular portion 2' of the corner bottom 2 and approximately 43% of the vertical length a2 of the rectangular portion 2', and release glue R4 is applied to the other parts. The upper side La of this rectangular adhesive glue L is applied close to the upper side 6a, and the lower side Lb is positioned at a level position above the horizontal edge 5b (see Figure 4). In addition, the adhesive glue is applied to the center of the upper horizontal piece 5 so that the application areas in the left and right directions of the center line P of the decorative paper 6 are the same length. Release glue R4 is applied to almost the entire back surface 6" of the decorative paper 6, except for the adhesive glue L.

[0069] The adhesive glue L is applied in a rectangular shape in Fig. 3, but this shape may be any shape, such as an inverted trapezoid (see the second embodiment, Fig. 7), a triangle, a rhombus, a circle, an ellipse, etc. Also, two to four triangles or circles may be applied side by side.

[0070] In addition, a finger insertion area 9, i.e., a portion where the release adhesive R4 is not applied, is formed on the back surface 6" of the center portion of the lower side 6b of the decorative paper 6 and may be trapezoidal, rectangular, semicircular, triangular, etc. (the finger insertion area 9 in Figure 3 is approximately trapezoidal). This finger insertion area 6 (see Figure 3) spans approximately 53% of the horizontal width a1 (the same horizontal width as the adhesive adhesive L), and the vertical width (vertical width) of this finger insertion area 9 is approximately 14% of the vertical length a2 (for example, the horizontal width of the finger insertion area 9 is approximately 210 mm, and the vertical length is approximately 12.6 mm). The number, size, and shape of these finger insertion areas 9 are not limited. Furthermore, the finger insertion areas 9 may be provided in two or three places on the lower side 6b of the decorative paper 6, and the number and shape are not limited.

[0071] The boundary portion between the above-mentioned adhesive glue L and the peelable glue R4 (the bottom edge Lb of the adhesive glue L, and the left and right vertical edges Lc, Ld) is spaced at a constant distance t1, but this distance t1 may be narrower, or the distance t1 between the periphery of the adhesive glue L and the peelable glue R4 may not be set.

[0072] The decorative paper 6 constructed in this manner is attached with its back surface 6" corresponding to the area of ​​the rectangular portion 2' on the surface of the angular bottom 2 (see Figure 4). Note that Figure 4 shows the decorative paper 6 shown below the angular bottom 2 attached to the rectangular portion 2' of the angular bottom 2. In other words, the adhesive glue L is configured to be located in the center of the upper horizontal piece 5 (surface), and the other peelable glue R4 is configured to be located in other parts of the rectangular portion 2' of the angular bottom 2.

[0073] The adhesive glue L is located in the center of the upper horizontal piece 5, and its upper edge La is located close to the upper edge 2a of the corner bottom 2, and a distance t2 (t2>t1) is formed between the lower edge Lb of the adhesive glue L and the horizontal edge 5b of the upper horizontal piece 5.

[0074] The portion other than the adhesive glue L is a release glue R4, which is positioned corresponding to almost the entire area of ​​the rectangular portion 2' of the corner bottom portion 2, and the portion of the adhesive glue L is strongly adhered to the upper horizontal piece 5, while the other portions are relatively weakly adhered by the release glue R4.

[0075] The peel-off adhesive R4 is adhered to the left and right surfaces of the upper horizontal piece 5 (surfaces of the right-angled triangular portions 5a, 5a), the surface of the inner triangular portion 3", 3", the upper surface of the upper horizontal piece 5 in the left-right direction along the horizontal edge 5b, and the lower surface of the lower horizontal piece 4 in the left-right direction along the horizontal edge 5b (see Figure 4).

[0076] In addition, the finger insertion section 9 (the portion of the finger insertion section 9 along the lower edge 2b of the corner bottom portion 2) is not coated with release adhesive R4, and there is no adhesion between the surface of the lower horizontal piece 4 and the back surface 6" of the decorative paper 6.

[0077] To open the packaging bag 1 constructed in this way, as shown in Fig. 5, insert your fingers into the finger insertion section 9 on the lower edge 2b side of the square bottom portion 2 and peel off the decorative paper 6 upward (in the direction of arrow A). That is, peel off the decorative paper 6 in a direction perpendicular to the longitudinal direction (in the direction of arrow A). Then, the portion of the adhesive L on the back surface 6" of the decorative paper 6 is strongly adhered to the center of the surface of the upper horizontal piece 5, while the back surface of the upper horizontal piece 5 and the surface of the lower horizontal piece 4 are adhered by a linear release adhesive R3 (adhesive strength of the adhesive L > adhesive strength of the release adhesives R1, R2, R3), and the left and right ends of the upper horizontal piece 5 are adhered by right-angled triangular release adhesives R2, R2. Therefore, by peeling the decorative paper 6 upward, the adhesive strength of the adhesive L is higher than the adhesive strength of the release adhesives R2, R2, R3, so that the release adhesives R2, R2 on the upper horizontal piece 5 and the large isosceles triangle portions 3, 3 are peeled off, and the portion of the release adhesive R3 on the back surface of the upper horizontal piece 5 and the surface of the upper horizontal piece 4 is peeled off, and the adhesive L on the back surface 6" of the decorative paper 6 remains adhered to the upper horizontal piece 5.

[0078] If the release adhesives R1-R3 and the release adhesive R4 of the decorative paper 6 have the same adhesive strength, the release adhesive R4 of the decorative paper 6 will peel off from the inner triangular portions 3", 3", and similarly, the upper horizontal piece 5 will open upward together with the decorative paper 6, and since the opening direction of the lower horizontal piece 4 (direction of arrow A) is different from the opening direction (direction of arrow B), the release adhesives R1, R1 on the back side of the lower horizontal piece 4 will not peel off, but the release adhesive R4 will peel off from the surface of the lower horizontal piece 4, resulting in the state shown in Figure 6.

[0079] If the adhesive strength of release glue R4 is greater than that of release glues R1 to R3, the release glue R4 of the decorative paper 6 will peel off from the inner triangular portions 3", 3", and since the opening direction of the decorative paper 6 (direction of arrow A) of the lower horizontal piece 4 is different from the opening direction (direction of arrow B), the release glue R4 has a greater adhesive strength, but the release glues R1, R1 on the back side of the lower horizontal piece 4 do not peel off, and the release glue R4 will peel off from the surface of the lower horizontal piece 4, resulting in the decorative paper 6 in the state shown in Figure 6.

[0080] As a result, as shown in Figure 6, when the decorative paper 6 is pulled upward, since the adhesive L and the upper horizontal piece 5 are attached, the upper horizontal piece 5 also adheres to the decorative paper 6 and opens upward together with the decorative paper 6. That is, the linear portion of the release adhesive R3 peels off from the lower horizontal piece 4, and the right-angled triangular release adhesives R2, R2 also peel off from the upper halves of the left and right parts of the large isosceles triangle portions 3, 3, and since the portion of the adhesive L on the surface side of the upper horizontal piece 5 is strongly adhered to the decorative paper 6, the upper horizontal piece 5 opens upward together with the decorative paper 6 (see Figure 6).

[0081] Thereafter, the packaging bag 1 can be opened by opening the lower horizontal piece 4 downward (in the direction of arrow B). That is, since the lower horizontal piece 4 is adhered to the left and right lower halves of the large isosceles triangular portions 3, 3 by peelable adhesives R1, R1 (see FIG. 3), the lower horizontal piece 4 can be opened downward relatively easily.

[0082] In this case, since no conventional cutting tape is used, the cutting tape itself becomes waste in the past, but since no cutting tape is used, no waste is generated. Moreover, in the past, the decorative paper was cut horizontally with the cutting tape, so paper pieces were generated at the cut part, and these paper pieces sometimes entered the inside of the packaging bag 1, but in the present invention, the decorative paper 6 remains attached to the upper horizontal piece 5, so the decorative paper 6 itself does not generate waste, and since the decorative paper 6 is not cut with the cutting tape, no paper pieces are generated, and the paper pieces do not enter the packaging bag 1.

[0083] In addition, conventionally, it was necessary to divide the decorative paper 6 in two horizontally with cutting tape, and then to open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper in two horizontally with cutting tape, opening the upper horizontal piece upwards, and opening the lower horizontal piece downwards.

[0084] In contrast, in the present invention, when the decorative paper 6 is pulled upward (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), the upper horizontal piece 5 is also opened at the same time, so that the packaging bag can be opened with two actions: pulling the decorative paper 6 upward (in the direction of arrow A) and opening the lower horizontal piece 4 downward (in the direction of arrow B), making it possible to open the packaging bag in a shorter time.

[0085] In addition, conventionally, the decorative paper was peeled off horizontally (horizontally, parallel to the longitudinal direction), which required the decorative paper to be completely separated from the bottom corner and the action of opening the upper and lower horizontal pieces up and down, and peeling the conventional decorative paper horizontally resulted in the decorative paper itself becoming waste and paper scraps being generated, which was undesirable. In the present invention, the rectangular decorative paper 6 is peeled off upward (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), so the peeling distance is short, and the decorative paper 6 and the upper horizontal piece 5 can be opened together with one action, and the decorative paper 6 is not separated by the adhesive L fixed to the upper horizontal piece 5, so the decorative paper 6 itself does not become waste and the generation of paper scraps can be minimized.

[0086] As described above, the packaging bag of the first embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), and the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), so that an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), In a packaging bag (1) having a rectangular portion (2') in the center and an outer triangular portion (3', 3') of the large isosceles triangular portion (3, 3) formed on the left and right sides of the rectangular portion (2'), a release adhesive (R1, R1) is applied to each surface of the right and left right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and a release adhesive (R2) is applied to each surface of the right and left right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). , R2) is applied, release glue (R3) is applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5), the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the corner bottom portion (2), and a rectangular decorative paper (decorative piece) (6) is affixed to the area of ​​the rectangular portion (2') on the corner bottom portion (2). The back surface (6") of the decorative paper (decorative piece) (6) has adhesive glue (L) applied opposite the center of the upper horizontal piece (5), and release glue (R4) is applied to the rest of the back surface (6") of the decorative paper (decorative piece) (6). Furthermore, the back surface (6") of the decorative paper (decorative piece) (6) has a finger insertion portion (9) along the lower edge (2b) of the corner bottom portion (2) where release glue (R4) is not applied.

[0087] Second Embodiment Next, a second embodiment will be described with reference to FIGS. The method of folding the corner bottom 2 of the packaging bag 1 and the method of applying the release adhesives R1 to R3 are the same as those in Fig. 1 and Fig. 2, so the explanation will be omitted. The material of the packaging bag 1 is also the same as that in the first embodiment, and the components of the adhesive adhesive L and the release adhesives R1 to R4 are also the same as those in the first embodiment, so the explanation will be omitted.

[0088] The adhesive strength of the release adhesives R1 to R3 used on the corner bottom 2 of the packaging bag 1 and the release adhesive R4 used on the decorative paper 6 may be the same, but the adhesive strength of R4 after peeling may be stronger than the release adhesives R1 to R3 (but lower than the adhesive strength of the adhesive L). This is the same as in the first embodiment.

[0089] Next, decorative paper 6 (e.g., kraft paper, e.g., 75 g / m 2 7 and 8, the decorative paper 6 has no adhesive applied to its front surface 6', but has adhesive adhesive L and release adhesive R4 applied to its back surface 6''.

[0090] The size of the decorative paper 6 is approximately the same as that of the rectangular portion 2'. That is, the width of the decorative paper 6 is approximately the same as the width a1 of the square bottom portion 2, and the length of the decorative paper 6 is approximately the same as the length a2 of the square bottom portion 2, forming a rectangle as a whole (e.g., a1 = 400 mm, a2 = 90 mm).

[0091] An inverted trapezoidal adhesive glue L is applied to the back surface 6" of the decorative paper 6 facing the portion corresponding to the tip of the upper horizontal piece 5 of the corner bottom portion 2 (the lower half of the decorative paper 6), and a release glue R4 is applied to the other portion (back surface 6").

[0092] The adhesive L on the back surface 6" of the decorative paper 6 is the same length on both sides of the center line P of the decorative paper 6, and when it is attached to the corner bottom 2 (rectangular portion 2'), it is applied so as to be positioned corresponding to the upper surface of the upper horizontal piece 5, and release adhesive R4 is applied to the other parts (parts other than the adhesive L of the rectangular portion 2'). Therefore, when the decorative paper 6 is attached to the corner bottom 2 (rectangular portion 2') with its back surface 6", the adhesive L is attached to the upper surface of the upper horizontal piece 5, and release adhesive R4 is attached to the other parts. Therefore, when the decorative paper 6 is pulled upward (in the direction of arrow A) from the finger insertion portion 9 (see Figure 5), the release adhesives R2 and R3 are peeled off, and since the adhesive L attached to the upper horizontal piece 5 is strongly adhered, the decorative paper 6 has the function of being able to be opened together with the upper horizontal piece 5.

[0093] As an example, as shown in Figures 7 and 8, the portion of the adhesive L (inverted trapezoidal shape) is a portion that can be attached to the surface side of the inverted trapezoidal portion at the tip (lower side) of the upper horizontal piece 5 when the decorative paper 6 is attached to the corner bottom portion 2 (rectangular portion 2'), and the lower side Lf is slightly shorter than the horizontal edge 5b of the upper horizontal piece 5, and the left and right inclined side sides Lg, Lh run along the inclined sides 5c, 5d of the upper horizontal side 5 and reach the upper side Le. The vertical width of the adhesive L is about 23% of the vertical width a2 of the decorative paper 6, the upper side Le is about 73% of the width a1, and the lower side Lf is about 55% of the width a1. This inverted trapezoidal adhesive L is applied to the center so that the applied portions in the left and right directions of the center line P of the decorative paper 6 are the same length. A release adhesive R4 is applied to substantially the entire back surface 6'' of the decorative paper 6 except for the adhesive L.

[0094] In addition, on the back surface 6" of the central portion of the lower side 6b of the decorative paper 6, a portion where the release adhesive R4 is not applied, i.e., a finger insertion portion 9, is formed, which has a trapezoidal, rectangular (rectangular, square), semicircular, triangular, etc. shape. The horizontal width of this finger insertion portion 9 (rectangular finger insertion portion 9 shown in Figure 7) is approximately 30% of the horizontal width a1, and the vertical width (vertical width) of this finger insertion portion 9 is approximately 13% of the vertical length a2 (the horizontal width of the finger insertion portion 9 (in the case of a rectangular shape) is, for example, 120 mm, and the vertical length is, for example, 11 mm). The horizontal widths of the finger insertion portion 9 in the left and right directions relative to the center line P are each of equal length. The number, size, and shape of these finger insertion portions 9 are not limited. Furthermore, the finger insertion portions 9 may be provided in two or three places on the lower side 6b of the decorative paper 6, and the number and shape are not limited.

[0095] The portion other than the adhesive glue L is a release glue R4, which is positioned corresponding to almost the entire area of ​​the rectangular portion 2' of the corner bottom portion 2, and the portion of the adhesive glue L is strongly adhered to the upper horizontal piece 5, while the other portions are relatively weakly adhered by the release glue R4.

[0096] The peel-off adhesive R4 is adhered to the upper half of the upper horizontal piece 5, the left and right surfaces (right-angled triangular portions 5a, 5a), the surface of the inner triangular portion 3", 3", the upper surface of the upper horizontal piece 5 in the left-right direction along the horizontal edge 5b, the lower surface of the lower horizontal piece 4 in the left-right direction along the horizontal edge 5b, and the left and right surfaces of the lower horizontal piece 4 (right-angled triangular portions 4a, 4a) (see Figures 7 and 8).

[0097] The boundary between the adhesive glue L and the release glue R4 (upper edge Le, lower edge Lf, left and right sides Lg, Lh of the adhesive glue L) is spaced at a constant distance t3, but this distance t3 may be narrower, and the distance t3 between the periphery of the adhesive glue L and the release glue R4 may not be provided. In this case, the boundary of the adhesive glue L and the boundary of the release glue R are approximately the same. Also, a distance t4 is provided between the release glue R4 and the outer periphery of the decorative paper 6 (see FIG. 7), but this need not be provided either. The components of the release adhesives R1 to R3 of the corner bottom portion 2, and the components and adhesive strength of the adhesive L and release adhesive R4 of the decorative paper 6 are the same as those of the first embodiment. That is, the adhesive strength of the release adhesives R1 to R3 may be the same as that of the release adhesive R4, or the adhesive strength of the release adhesive R4 may be higher than that of the release adhesives R1 to R3.

[0098] The decorative paper 6 constructed in this manner is attached with its back surface 6" corresponding to the area of ​​the rectangular portion 2' on the surface of the angular bottom portion 2. In other words, the inverted trapezoidal adhesive L portion is configured to be located on the tip of the upper horizontal piece 5 (see Figure 8), and the other release adhesive R4 portions are configured to be located in other areas. Figure 8 shows the decorative paper 6 shown below the angular bottom 2 attached to the rectangular portion 2' of the angular bottom portion 2.

[0099] The adhesive glue L portion (inverted trapezoidal shape) is located at the tip of the inverted trapezoidal shape on the surface of the upper horizontal piece 5, its lower edge Lf is located close to the horizontal edge 5b of the upper horizontal piece 5 and on the inside of the upper horizontal piece 5, and the left and right inclined edges Lg, Lh are located on the inside of the upper horizontal piece 5 along the left and right inclined edges 5c, 5d of the upper horizontal piece 5.

[0100] The lower side Lf and the left and right inclined sides Lg, Lh of the adhesive L are spaced apart by the distance t3 from the horizontal piece 5b and the left and right inclined sides 5c, 5d of the upper horizontal piece 5. The portion other than the adhesive L is a release adhesive R4, which is located in correspondence with substantially the entire area of ​​the corner bottom portion 2, and the portion of the adhesive L is strongly adhered to the upper horizontal piece 5, while the other portions are relatively weakly adhered by the release adhesive R4.

[0101] The release adhesive R4 is adhered to the upper surface of the upper horizontal piece 5, the surface of the inner triangular portion 3", 3", and the lower surface in the left-right direction of the lower horizontal piece 4 (see Figure 8). Furthermore, the finger insertion portion 9 (the portion of the finger insertion portion 9 along the lower edge 2b of the corner bottom portion 2) does not have release adhesive R4 applied, and there is no adhesion between the surface of the lower horizontal piece 4 and the back surface 6" of the decorative paper 6.

[0102] To open the packaging bag 1 constructed in this way, as shown in Fig. 5, insert your fingers into the finger insertion section 9 on the lower edge 2b side of the square bottom portion 2 and peel off the decorative paper 6 upward (in the direction of arrow A). That is, peel off the decorative paper 6 in a direction perpendicular to the longitudinal direction (in the direction of arrow A). Then, the portion of the fixed adhesive L on the back surface 6" of the decorative paper 6 is strongly adhered to the tip portion of the surface of the upper horizontal piece 5, while the back surface of the upper horizontal piece 5 and the surface of the lower horizontal piece 4 are adhered by a linear release adhesive R3 (see Figure 7), and the left and right ends of the upper horizontal piece 5 are adhered by right-angled triangular release adhesives R2, R2. Therefore, by pulling the decorative paper 6 upward, the adhesive strength of the fixed adhesive L is higher than the adhesive strength of the release adhesives R2, R2, R3, so that while the portions of the release adhesives R2, R2 and the release adhesive R3 are peeled off, the fixed adhesive L on the back surface 6" of the decorative paper 6 remains adhered to the upper horizontal piece 5.

[0103] If the release adhesives R1-R3 and the release adhesive R4 of the decorative paper 6 have the same adhesive strength, the release adhesive R4 of the decorative paper 6 will peel off from the inner triangular portion 3",3". Similarly, the upper horizontal piece 5 opens upward together with the decorative paper 6, and since the lower horizontal piece 4 opens in a direction different from the direction of arrow B, the release adhesives R1, R1 on the back side of the lower horizontal piece 4 do not peel off, but the release adhesive R4 peels off from the surface of the lower horizontal piece 4, resulting in the state shown in Figure 6.

[0104] When the adhesive strength of the release glue R4 is greater than that of the release glues R1 to R3, the lower horizontal piece 4 is in a direction different from the opening direction (the direction of arrow B), so the release glue R4 has a greater adhesive strength, but the release glues R1, R1 on the back side of the lower horizontal piece 4 do not peel off, and the release glue R4 peels off from the surface of the lower horizontal piece 4, resulting in the state shown in Figure 6.

[0105] As a result, as shown in Figure 6, when the decorative paper 6 is pulled upward, the upper horizontal piece 5 also adheres to the decorative paper 6 and opens upward together with the decorative paper 6. That is, the linear portion of the release adhesive R3 peels off from the lower horizontal piece 4, and the right-angled triangular release adhesives R2, R2 also peel off from the upper half of the left and right parts of the large isosceles triangle portions 3, 3, and the portion of the adhesive L on the surface side of the upper horizontal piece 5 is strongly adhered to the decorative paper 6, so that the upper horizontal piece 5 opens upward together with the decorative paper 6 (see Figure 6).

[0106] Thereafter, the packaging bag 1 can be opened by opening the lower horizontal piece 4 downward (in the direction of arrow B). That is, since the lower horizontal piece 4 is adhered to the left and right lower halves of the large isosceles triangular portions 3, 3 by peelable adhesives R1, R1, the lower horizontal piece 4 can be opened downward relatively easily.

[0107] In this case, since no conventional cutting tape is used, the cutting tape itself becomes waste in the past, but since no cutting tape is used, no waste is generated. Moreover, in the past, the decorative paper was cut horizontally with the cutting tape, so paper pieces were generated at the cut part, and these paper pieces sometimes entered the inside of the packaging bag 1, but in the present invention, the decorative paper 6 remains attached to the upper horizontal piece 5, so no waste of the decorative paper 6 is generated, and since the decorative paper 6 is not cut with the cutting tape, no paper pieces are generated, and the paper pieces do not enter the packaging bag 1.

[0108] In addition, conventionally, it was necessary to divide the decorative paper 6 in two horizontally with cutting tape, and then to open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper in two horizontally with cutting tape, opening the upper horizontal piece upwards, and opening the lower horizontal piece downwards.

[0109] In contrast, in the present invention, when the decorative paper 6 is pulled upward (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), the upper horizontal piece 5 is also opened at the same time, so that the packaging bag can be opened with two actions: pulling the decorative paper 6 upward and opening the lower horizontal piece 4 downward, making it possible to open the packaging bag in a shorter time.

[0110] In addition, the decorative paper was previously peeled off horizontally (horizontally, parallel to the longitudinal direction), and the decorative paper had to be completely separated from the bottom corner, and the upper and lower horizontal pieces had to be opened up and down, and peeling the decorative paper horizontally in the past was undesirable, as the decorative paper itself became waste and paper scraps were also generated. In the present invention, the rectangular decorative paper 6 is peeled off upwards (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), so the peeling distance is short, and the decorative paper 6 and the upper horizontal piece 5 can be opened together in one action, and the decorative paper 6 itself does not separate from the upper horizontal piece 5, so the decorative paper 6 itself does not become waste, and the generation of paper scraps can be minimized.

[0111] As described above, the packaging bag 1 of the second embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and the central rectangular portion (1') is folded upward along the upper horizontal line (T2). In a packaging bag (1) having a rectangular-shaped portion (2') and an angular bottom portion (2) in which the left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular-shaped portion (2'), release glue (R1, R1) is applied to the surfaces of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), release glue (R2, R2) is applied to the surfaces of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), A release adhesive (R3) is applied horizontally to the surface of the lateral edge (5b) of the upper lateral piece (5), and the upper lateral piece (5) and the lower lateral piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the corner bottom portion (2). A rectangular decorative paper (decorative piece) (6) is attached to the area of ​​the rectangular portion (2') on the corner bottom portion (2). The back surface (6") of the decorative paper (decorative piece) (6), including the portion along the horizontal edge (5b) of the upper horizontal piece (5), is coated with adhesive glue (L) in an inverted trapezoidal shape facing the lower half of the upper horizontal piece (5), and the other portions are coated with release glue (R4). Furthermore, the back surface (6") of the decorative paper (decorative piece) (6) is provided with a finger insertion portion (9) along the lower edge (2b) of the corner bottom portion (2) where release glue (R4) is not applied.

[0112] (Third embodiment) Next, a third embodiment will be described with reference to FIGS. The method of folding the corner bottom portion 2 of the packaging bag 1 and the method of applying the release adhesives R1 to R3 are the same as those in Fig. 1 and Fig. 2, so the explanation will be omitted. The materials of the packaging bag 1 and the decorative paper 6 are also the same as those in the first embodiment, and the components of the adhesive adhesive L and the release adhesives R1 to R4 are also the same as those in the first embodiment, so the explanation will be omitted.

[0113] Next, decorative paper 6 (e.g., kraft paper, e.g., 75 g / m2 9 and 10, the decorative paper 6 has no adhesive applied to its front surface 6', but has adhesive adhesive L and release adhesive R4 applied to its back surface 6''.

[0114] The adhesive strength of the release adhesives R1 to R3 used on the corner bottom 2 of the packaging bag 1 and the release adhesive R4 used on the decorative paper 6 may be the same, but the adhesive strength of R4 after peeling may be stronger than the release adhesives R1 to R3 (but lower than the adhesive strength of the adhesive L). This is the same as in the first embodiment.

[0115] The size of the decorative paper 6 is approximately the same as that of the rectangular portion 2'. That is, the width of the decorative paper 6 is approximately the same as the width a1 of the square bottom portion 2, and the length of the decorative paper 6 is approximately the same as the length a2 of the square bottom portion 2, forming a rectangle as a whole (e.g., a1 = 400 mm, a2 = 90 mm).

[0116] The back surface 6'' of the decorative paper 6 is coated with adhesive glue L so that the trapezoidal portion of the adhesive glue L is located on the surface (lower half) of the lower horizontal piece 4 of the square bottom portion 2, and the remaining portion is coated with release glue R4.

[0117] Specifically, adhesive glue L is applied in the left-right direction along the lower edge 6b of the decorative paper 6, and the upper edge Li of the adhesive L is applied to the back surface 6" of the decorative paper 6 so as not to overlap the horizontal edge 5b of the upper horizontal piece 5, and the left and right side edges Lk, Ln are positioned along the left and right inclined edges 4b, 4c of the lower horizontal piece 4 (see Figure 10), and the upper edge Li is positioned below the horizontal edge 5b of the upper horizontal piece 5. The horizontal width of the lower edge Lj of the adhesive glue L is applied to be approximately the same as or slightly shorter than the lower edge 6b of the decorative paper 6.

[0118] The adhesive L on the back surface 6" of the decorative paper 6 is the same length on both sides of the center line P of the decorative paper 6, and when it is attached to the corner bottom 2, it is applied so that it is positioned corresponding to the upper surface of the lower horizontal piece 4, and release adhesive R4 is applied to the other parts (parts other than the adhesive L of the rectangular portion 2'). Therefore, when the decorative paper 6 is attached to the corner bottom 2 (rectangular portion 2') with its back surface 6", the adhesive L is attached to the surface of the lower horizontal piece 4, and release adhesive R4 is attached to the other parts. Therefore, when the decorative paper 6 is pulled downward (in the direction of arrow B) from the finger insertion portion 9 described below (see Figure 11), the adhesive L adhered to the lower horizontal piece 4 is strongly adhered, so that the release adhesive R4 is peeled off from the upper horizontal piece 5 for the time being and is in the position shown in Figure 11.

[0119] As an example, as shown in Figures 9 and 10, the adhesive glue L is located on the lower horizontal piece 4 (surface), and the vertical width of the adhesive glue L is approximately 26% of the vertical width a2 of the decorative paper 6, the upper edge Li is approximately 75% of the width a1, and the lower edge Lj is approximately 91% of the width a1. This adhesive glue L is applied to the lower half of the lower horizontal piece 4 so that the application areas on the left and right of the center line P of the decorative paper 6 are the same length. And, apart from the area of ​​the adhesive glue L, release glue R4 is applied to substantially the entire back surface 6" of the decorative paper 6.

[0120] The distance between the upper side Li of the adhesive L and the release adhesive R4 is t5, the distance between the side sides Lk, Ln of the adhesive L and the release adhesive R4 is t5, and the distance between the lower side Lj of the adhesive L and the lower side 6b of the decorative paper 6 is t5. The distance t5 may be narrower, or the distance t5 may not be provided. The adhesive L is applied in a trapezoidal shape in FIG. 9, but this shape may be any shape, such as an inverted trapezoid (second embodiment), a triangle, a diamond, a circle, an ellipse, etc. Also, two to four triangles or circles may be applied side by side in the horizontal direction.

[0121] In addition, in the center of the upper side 6a of the decorative paper 6 (the upper edge 2a of the corner bottom 2), a portion where the release adhesive R4 is not applied, i.e., a finger insertion portion 9, is formed, which is rectangular, trapezoidal, semicircular, triangular, etc. This finger insertion portion 9 is a portion that covers about 44% of the horizontal width a1, and the vertical width (vertical width) of this finger insertion portion 9 is about 10% of the vertical length a2 (the horizontal width of the finger insertion portion 9 (in the case of a rectangle) is, for example, 176 mm, and the vertical length is, for example, 9 mm). The horizontal widths of the finger insertion portion 9 in the left and right directions with respect to the center line P are each equal in length. The number, size, and shape of this finger insertion portion 9 are not limited. Furthermore, the finger insertion portions 9 may be provided in two or three places on the upper side 6a of the decorative paper 6, and the number and shape are not limited.

[0122] Also, the periphery of the release adhesive R4 is spaced from the periphery of the decorative paper 6 by a distance t6, but the distance t6 may be narrower or may not be set. The release adhesive R4 has left and right triangular protrusions 6i, 6j along the left and right sides Lk, Ln of the adhesive L, and is otherwise applied to substantially the entire back surface 6" of the decorative paper 6, except for the finger insertion area 9.

[0123] The decorative paper 6 thus constructed is attached with its back surface 6" corresponding to the area of ​​the rectangular portion 2' on the surface of the corner bottom 2. That is, the adhesive glue L is configured to be located in the lower half of the lower horizontal piece 4, and the other peelable glue R4 is attached to be located in other areas.

[0124] The portion (trapezoidal) of the adhesive glue L is located on the lower horizontal piece 4 (located between the lower edge 2b of the corner bottom portion 2 and the horizontal edge 5b of the upper horizontal piece 5), its lower side Lj is located close to the lower edge 2b of the rectangular portion 2', and the left and right inclined sides Lk, Ln are located in the lower half of the lower horizontal piece 4 along the left and right inclined sides 4b, 4c of the lower horizontal piece 4. In addition, the upper side Li of the adhesive glue L is located below the horizontal edge 5b of the upper horizontal piece 5. In other words, the upper side Li of the adhesive glue L is applied to the back surface 6" of the decorative paper 6 so as not to overlap the horizontal edge 5b of the upper horizontal piece 5. Note that Figure 10 shows the decorative paper 6 shown below attached to the rectangular portion 2' of the corner bottom portion 2.

[0125] The portion other than the above-mentioned adhesive glue L is a release glue R4, which is applied to the entire area of ​​the upper horizontal piece 5 and the entire areas of the left and right inner triangular portions 3", 3", including the above-mentioned vertices 3b, 3b. In other words, the release glue R4 is applied to almost the entire area of ​​the upper horizontal piece 5 and the left and right inner triangular portions 3", 3". Therefore, the portion of the adhesive glue L is strongly adhered to the lower horizontal piece 4, and the other portions are adhered relatively weakly by the release glue R4 (see Figure 10).

[0126] In addition, the finger insertion section 9 does not have peel-off adhesive R4 applied thereto, and the surface of the upper horizontal piece 5 at the upper edge 2a of the square bottom portion 2 is not bonded to the back surface 6" of the decorative paper 6.

[0127] To open the packaging bag 1 thus constructed, as shown in Fig. 10, insert your fingers into the finger insertion section 9 along the upper edge 2a of the bottom corner 2, and peel the decorative paper 6 downward (in the direction of arrow B). That is, peel it in a direction perpendicular to the longitudinal direction of the decorative paper 6 (in the direction of arrow B). Then, as shown in Fig. 11, the peelable adhesive R4 of the decorative paper 6 peels off, and the upper piece Li of the fixed adhesive L peels off first (below the horizontal edge 5b of the upper horizontal piece 5). That is, since the upper horizontal piece 5 and the left and right inner triangular portions 3",3" are entirely adhered by the peelable adhesive R4, by peeling the decorative paper 6 downward, the peelable adhesive R4 is peeled off relatively easily, and the upper side Li of the fixed adhesive L peels off first (below the horizontal edge 5b of the upper horizontal piece 5). Here, since the upper horizontal piece 5 is in the opposite direction to the opening direction (arrow B direction), if the release adhesives R2, R3 and R4 have the same adhesive strength, the release adhesive R4 will peel off from the surface of the upper horizontal piece 5, but the upper horizontal piece 5 will not peel off from the large isosceles triangle portion 3, 3 (corner bottom portion 2). Also, even if the adhesive strength of the release adhesive R4 is higher than that of the release adhesives R2, R3, since the upper horizontal piece 5 is in the opposite direction to the opening direction (arrow B direction), the release adhesive R4 will peel off from the surface of the upper horizontal piece 5, but the upper horizontal piece 5 will not peel off from the large isosceles triangle portion 3, 3 (corner bottom portion 2), and the release adhesives R2, R2, R3 will remain adhered.

[0128] At this time, the upper horizontal piece 5 and the lower horizontal piece 4 are adhered with linear peelable adhesive R3, so at this stage the peelable adhesive R3 between the upper horizontal piece 5 and the lower horizontal piece 4 has not peeled off. Therefore, at this point (the point in Figure 11), the upper horizontal piece 5 is peeled upward (in the direction of A) to open it, and then the decorative paper 6 is further peeled downward (in the direction of arrow B) to open the lower horizontal piece 4. The front surface of the lower horizontal piece 4 and the back surface 6" of the decorative paper 6 are firmly adhered with the adhesive L, so that by pulling the decorative paper 6 downward, the lower horizontal piece 4 is also pulled downward (or the lower horizontal piece 4 is peeled downward (in the direction of arrow B)), and the packaging bag 1 can be opened.

[0129] In this case, since no conventional cutting tape is used, the cutting tape itself would become waste in the past, but since no cutting tape is used, no waste is generated. Moreover, in the past, the decorative paper was cut horizontally (parallel to the length of the decorative paper) with the cutting tape, so paper pieces were generated from the cut part and these paper pieces could enter the inside of the packaging bag 1, but in the present invention, the decorative paper 6 remains attached to the lower horizontal piece 4, so no waste of the decorative paper 6 is generated, and since the decorative paper 6 is not cut with the cutting tape, no paper pieces are generated and the paper pieces do not enter the packaging bag 1.

[0130] In addition, conventionally, it was necessary to divide the decorative paper 6 into two halves, top and bottom, with cutting tape, and then to open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper into two with the cutting tape, opening the upper horizontal piece upwards, and opening the lower horizontal piece downwards.

[0131] In contrast, the present invention requires three actions: pulling the decorative paper 6 downward (in the direction of arrow B) (vertical direction, perpendicular to the longitudinal direction of the decorative paper 6), pulling the upper horizontal piece 5 upward (in the direction of arrow A), and opening the decorative paper 6 downward (in the direction of arrow B) together with the lower horizontal piece 4.However, it is believed to be superior to conventional methods in that it does not use cutting tape, does not cut the decorative paper 6, and does not produce paper scraps.

[0132] In addition, the decorative paper was previously peeled off horizontally (horizontally, parallel to the longitudinal direction), and the upper and lower horizontal pieces had to be opened up and down, and when the decorative paper was previously peeled off horizontally, the decorative paper completely separated from the corner base, and the decorative paper itself became waste, and paper scraps were also generated, which was undesirable. In the present invention, the rectangular decorative paper 6 is peeled off downward (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), and the decorative paper 6 and the upper horizontal piece 4 are both peeled off downward together with the upper horizontal piece 4, so the decorative paper 6 does not separate from the corner base 2, the decorative paper 6 itself does not become waste, and because the distance the decorative paper 6 is peeled off is short, the generation of paper scraps can be minimized.

[0133] As described above, according to the packaging bag 1 of the third embodiment of the present invention, large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward are formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), and the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), forming an overlapping portion (S1) between the upper horizontal piece (5) and the lower horizontal piece (4), In a packaging bag (1) having a rectangular portion (2') in the center and an outer triangular portion (3', 3') of the large isosceles triangular portion (3, 3) formed on the left and right sides of the rectangular portion (2'), a release adhesive (R1, R1) is applied to each surface of the right and left right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and a release adhesive (R2, R2) is applied to each surface of the right and left right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). is applied to the surface of the horizontal edge (5b) of the upper horizontal piece (5), a release adhesive (R3) is applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5), the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the corner bottom portion (2), and a rectangular decorative paper (decorative piece) (6) is attached to the area of ​​the rectangular portion (2') on the corner bottom portion (2). The back surface (6") of the decorative paper (decorative piece) (6) is applied with adhesive adhesive (L) so as not to reach the lower half of the lower horizontal piece (4) and the horizontal edge (5b) of the upper horizontal piece (5), and release adhesive (R4) is applied to the other parts. Furthermore, the back surface (6") of the decorative paper (6) is provided with a finger insertion portion (9) along the upper edge (2a) of the corner bottom portion (2) where release adhesive (R4) is not applied.

[0134] (Fourth embodiment) As shown in FIG. 12, a packaging bag 1 (material is, for example, kraft paper, with a basis weight of, for example, 75 g / m 2 The method of forming the corner bottom portion 2 is the same as that of the first embodiment, except that the release adhesive R3 is not present.

[0135] That is, as shown in Fig. 12, the release glue R1, R1 is applied in a right-angled triangular shape to the surface side of the left and right right-angled triangular parts 4a, 4a of the lower horizontal piece 4 below the lower horizontal line T1, and the release glue R2, R2 is applied in a right-angled triangular shape to the surface side of the left and right right-angled triangular parts 5a, 5a of the upper horizontal piece 5 above the upper horizontal line T2. In the first embodiment, a linear release glue R3 is applied to the surface along the horizontal edge 5b of the upper horizontal piece 5, but the release glue R3 is not applied here. In addition, by setting the lower horizontal line T1 slightly downward and the upper horizontal line T2 slightly upward, the vertical width of the overlapping part S2 is reduced from that of the first to third embodiments (e.g., Fig. 2) (see Fig. 13).

[0136] Then, by folding the lower horizontal piece 4 upward along the lower horizontal line T1, the right-angled triangular peel-off adhesive R1, R1 is adhered, and the surface sides of the left and right lower halves of the large isosceles triangle portions 3, 3 (right-angled triangular portions 4a, 4a, peel-off adhesive R1, R1 in Figure 13) are adhered, thereby adhering the lower horizontal piece 4 to the lower half of the large isosceles triangle portions 3, 3 (see Figure 13).

[0137] Furthermore, by folding the upper horizontal piece 5 downward along the upper horizontal line T2, the right-angled triangular peel-off adhesive R2, R2 is adhered, and the surface sides of the upper left and right sides of the large isosceles triangle portion 3, 3 (right-angled triangular portions 5a, 5a, peel-off adhesive R2, R2 in Figure 13) are adhered, so that the upper horizontal piece 5 is adhered to the upper half of the large isosceles triangle portion 3, 3 (see Figure 13).

[0138] At this time, the left and right vertex portions 3a, 3a of the above-mentioned large isosceles triangular portions 3, 3, and the vertex portions 3b, 3b formed by the above-mentioned upper side horizontal piece 5 and the above-mentioned lower side horizontal piece 4 are configured to be in the same position in the left-right direction. Also, the lower side horizontal piece 4 is below and the upper side horizontal piece 5 is above, and an overlapping portion S2 is provided, but the surface of the lower side horizontal piece 4 and the back surface portion of the horizontal edge 5b of the upper side horizontal piece 5 are not adhered. Also, the vertical width (longitudinal width) of the above-mentioned overlapping portion S2 is narrower than that of the first to third embodiments (S2 < S1). In the first to third embodiments, for example, S1 = 30 mm (for example, 10% to 100% of the vertical width (a2) of the square bottom portion 2), and in the fourth embodiment, for example, S2 = 10 mm (for example, 0% to 50% of the vertical width (a2) of the square bottom portion 2).

[0139] In addition, as the adhesives (release pastes R1, R2) having release performance, a vinyl acetate resin-based adhesive is 5% or more and 15% or less, an acrylic resin-based adhesive is 5% or more and 15% or less, wax is 5% or more and 15% or less, and the total components of the above-mentioned vinyl acetate-based adhesive, the above-mentioned acrylic resin-based adhesive, and wax are 25% or more and 35% or less. Otherwise, those having a component of water of 65% (when the total component is 35%) to 75% (when the total component is 25%) function as release pastes. As the release paste, it is also possible to use release pastes with other constituent component percentages. In addition, the release paste as an adhesive is a general one and is not particularly special. This is the same as in the first embodiment.

[0140] The size of the decorative paper 6 is substantially the same as that of the above-mentioned rectangular portion 2'. That is, the horizontal width of the decorative paper 6 is substantially the same as the horizontal width a1 of the square bottom portion 2, and the vertical length of the decorative paper 6 is substantially the same as the vertical length a2 of the square bottom portion 2, forming a rectangle as a whole (see FIG. 13. For example, a1 = 400 mm, a2 = 90 mm).

[0141] Next, the decorative paper 6 (for example, kraft paper, for example, basis weight 75 g / m 2 ) will be described with reference to FIGS. 13 and 14. On the surface 6' side of the above-mentioned decorative paper 6, no paste is applied, but the fixing paste L and the release paste R4 are separately applied on the back surface 6" side.

[0142] Here, the adhesive glue L is a glue with strong adhesive power, such as a vinyl acetate resin adhesive. In the fourth embodiment, the peel-off glue R4 used in the decorative paper 6 may have the same adhesive strength as the peel-off glues R1 to R3 used in the corner bottom portion 2 of the packaging bag 1 in the first to third embodiments, but the post-peeling glue R4 used in the decorative paper 6 in the fourth embodiment may have an adhesive strength stronger than the peel-off glues R1 to R3 used in the corner bottom portion 2 in the first to third embodiments (same as the first to third embodiments).

[0143] The release adhesive R4 has a stronger adhesive strength than the release adhesives R1 to R3, and is an adhesive having a peeling property, such as a mixture of a vinyl acetate resin adhesive and wax. The release adhesive R4 may have, for example, a vinyl acetate resin adhesive of 10% to 20%, a wax of 5% to 15%, a total component of the vinyl acetate resin adhesive and the wax of 25% to 35%, and other components of 65% (when the total component is 35%) to 75% (when the total component is 25%) of water. Since the adhesive strength of the acrylic resin adhesive is weak, the adhesive strength is increased by making the vinyl acetate resin adhesive 10% to 20%, even if the wax component is the same. The release adhesive is a known technology and is not particularly special. This is the same as in the first embodiment.

[0144] In other words, the adhesive strength of the adhesive L and the release adhesive in the first to fourth embodiments is in the order of "adhesive adhesive L of decorative paper 6" > "release adhesive R4 of decorative paper 6 = release adhesives R1-R3 of corner bottom portion 2 of packaging bag 1" or "adhesive adhesive L of decorative paper 6" > "release adhesive R4 of decorative paper 6" > "release adhesives R1-R3 of corner bottom portion 2 of packaging bag 1."

[0145] Furthermore, limiting it to the fourth embodiment, the adhesive strength of the above-mentioned release glue may be the same as that of the release glues R1 and R2, but it is preferable that the order is "adhesive glue L of decorative paper 6" > "release glue R4 of decorative paper 6" > "release glue (R1, R2) of the corner bottom portion 2 of the packaging bag 1."

[0146] In this way, there are two types of adhesive strength: the weak adhesive strength of the release adhesives R1 to R3 of the corner bottom portion 2, and the stronger adhesive strength of the release adhesive R4 of the decorative paper 6.

[0147] The adhesive L on the back surface 6" of the decorative paper 6 is the same length on both sides of the center line P of the decorative paper 6, and when it is attached to the corner bottom 2 (see Figure 14), it is applied so that it is positioned corresponding to the top surface of the upper horizontal piece 5, and release adhesive R4 is applied to the other parts (parts other than the adhesive L of the rectangular portion 2'). Therefore, when the decorative paper 6 is attached to the corner bottom 2 (rectangular portion 2') with its back surface 6", the adhesive L is attached to the top surface of the upper horizontal piece 5, and release adhesive R4 is attached to the other parts. Therefore, when the decorative paper 6 is pulled upward (in the direction of arrow A) from the finger insertion portion 9 (see Figure 5), the release adhesive R2 is peeled off, and since the adhesive L adhered to the upper horizontal piece 5 is strongly adhered, the decorative paper 6 has the function of being able to be opened together with the upper horizontal piece 5.

[0148] As an example, as shown in Figures 13 and 14, adhesive glue L is applied in a rectangular shape along the upper edge 6a of the back surface 6" of the decorative paper 6, covering approximately 55% of the horizontal width a1 and approximately 43% of the vertical length a2, and release glue R4 is applied to the remaining portion. This adhesive glue L is applied to the upper edge Lo close to the upper edge 6a, and is applied to the center so that the application portions on the left and right sides of the center line P of the decorative paper 6 are the same length. The left and right vertical sides Lq, Ls of the adhesive glue L in the vertical direction are approximately the same length as the vertical width of the upper horizontal piece 5, and extend almost the entire vertical width of the upper horizontal piece 5 (see FIG. 14). The adhesive glue L is applied in a rectangular shape in FIG. 13, but this shape may be any shape, such as an inverted trapezoid (second embodiment), a triangle, a diamond, a circle, an ellipse, etc. Also, two to four triangles or circles may be applied side by side in the horizontal direction.

[0149] The vertical width of the overlapping portion S2 is reduced from that of the first to third embodiments (e.g., FIG. 1), the lower side Lp of the adhesive L is located close to the horizontal edge 5b of the upper horizontal piece 5, and the release adhesive R4 is located along the horizontal edge 5b. As a result, the width of the release adhesive R4 from the horizontal edge 5b of the upper horizontal piece 5 to the upper edge of the finger insertion section 9 is longer than that of the first embodiment (see FIG. 4) (e.g., 15 mm in the first embodiment, and 25 mm in the fourth embodiment). The strength of the adhesion between the release adhesive R4 on the back surface 6" of the decorative paper 6 and the surface of the lower horizontal piece 4 is increased, so that the back surface 6" of the upper horizontal piece 5 of the corner bottom portion 2 is longer than that of the first embodiment (see FIG. 4). The release adhesive R3 on the surface of the lower horizontal piece 4 may not be present. That is, since the vertical width (S2) is narrower than the overlapping portion S1, the adhesive strength is improved by expanding the area of ​​the adhesive R4 of the decorative paper 6 from the horizontal edge 5b of the upper horizontal piece 5 to the lower edge 4d of the lower horizontal piece 4 in the vertical direction, so that the horizontal release adhesive R3 provided in the first to third embodiments is not necessary and the ease of opening can be improved. The adhesive area (distance) (the distance from the horizontal edge 5b to the lower edge 4d of the lower horizontal piece 4) is, for example, 30 mm in the first to third embodiments and, for example, 40 mm in the fourth embodiment.

[0150] A release adhesive R4 is applied to the entire back surface 6'' of the decorative paper 6 except for the adhesive L.

[0151] That is, the release adhesive R4 is applied to the parts other than the adhesive L, i.e., the right and left right-angled triangular parts 5a, 5a of the upper horizontal piece 5, the inner triangular part 3", 3", and almost the entire area of ​​the lower horizontal piece 4. In addition, in the central part of the lower side 6b of the decorative paper 6 (along the lower edge 2b of the corner bottom part 2), a part where the release adhesive R4 is not applied, i.e., a finger insertion part 9, is formed in a trapezoidal, rectangular, semicircular, triangular or other shape. The finger insertion part 9 is a part that spans about 50% of the horizontal width a1 (the same horizontal width as the adhesive adhesive L), and the vertical width of this finger insertion part 9 (in the case of a rectangle) is about 15% of the vertical length a2 (the horizontal width of the finger insertion part 9 is, for example, 200 mm, and the vertical length is, for example, 13.5 mm). The number, size and shape of the finger insertion part 9 are not limited. Furthermore, the finger insertion sections 9 may be provided at two or three locations on the lower side 6b of the decorative paper 6, and the number and shape thereof are not limited.

[0152] The boundary between the adhesive glue L and the release glue R4 (the left and right vertical sides Lq, Ls of the adhesive glue L) has a constant distance t7, a distance t8 is provided between the upper side Lo of the adhesive glue L and the upper side 6a, and a distance t9 is provided between the lower side Lp of the adhesive glue L and the release glue R4. These distances t7 to t9 may be narrower, or the distances t7 to t9 between the periphery of the adhesive glue L and the release glue R4 may not be provided.

[0153] The decorative paper 6 thus constructed is attached with its back surface 6" corresponding to the area of ​​the rectangular portion 2' on the surface of the corner bottom portion 2. That is, the adhesive glue L is configured to be located in the center of the upper horizontal piece 5, and the other peelable glue R4 is configured to be located in other areas (see FIG. 14).

[0154] The adhesive glue L is located on the surface of the central part of the upper horizontal piece 5, its upper edge Lo is located close to the upper edge 2a of the corner bottom portion 2, and the lower edge Lp of the adhesive glue L is located close to the horizontal edge 5b of the upper horizontal piece 5.

[0155] The portion other than the adhesive glue L is a release glue R4, which is positioned corresponding to almost the entire area of ​​the corner bottom portion 2, the portion of the adhesive glue L being strongly adhered to the surface of the upper horizontal piece 5, and the other portions being adhered by the release glue R4.

[0156] The peel-off adhesive R4 is adhered to the left and right surfaces (right-angled triangular portions 5a, 5a) of the upper horizontal piece 5, the surface of the inner triangular portion 3", 3", and the lower left and right surface (right-angled triangular portions 4a, 4a) of the lower horizontal piece 4 along the horizontal edge 5b (see Figure 14).

[0157] In addition, the finger insertion section 9 (the lower edge 2b of the corner bottom portion 2) is not coated with release adhesive R4, and there is no adhesion between the surface of the lower horizontal piece 4 and the back surface 6" of the decorative paper 6.

[0158] To open the packaging bag 1 thus constructed, as shown in FIG. 5, insert a finger into the finger insertion portion 9 along the lower edge 2b of the square bottom portion 2, and peel the decorative paper 6 upward (in the direction of arrow A). That is, peel it in a direction perpendicular to the longitudinal direction of the decorative paper 6 (in the direction of arrow A). Then, the portion of the adhesive L on the back surface 6" of the decorative paper 6 is strongly adhered to the center of the surface of the upper horizontal piece 5, while the back surface (horizontal edge 5b) of the upper horizontal piece 5 and the surface of the lower horizontal piece 4 are not adhered to each other, and the left and right ends of the upper horizontal piece 5 are adhered to the right-angled triangular release adhesives R2, R2. Therefore, by peeling the decorative paper 6 upward, the adhesive strength of the adhesive L is higher than the adhesive strength of the release adhesives R2, R2, and therefore the portion of the release adhesives R2, R2 is peeled off, while the adhesive L on the back surface 6" of the decorative paper 6 remains adhered to the upper horizontal piece 5.

[0159] As a result, as shown in Figure 6, when the decorative paper 6 is pulled upward, the upper horizontal piece 5 also adheres to the decorative paper 6 and opens upward together with the decorative paper 6. That is, the right-angled triangular release adhesives R2, R2 also peel off from the upper halves of the left and right sides of the large isosceles triangle portions 3, 3, and since the portion of the adhesive L on the surface side of the upper horizontal piece 5 is strongly adhered to the decorative paper 6, the upper horizontal piece 5 opens upward together with the decorative paper 6 (see Figure 6).

[0160] At this time, the back side of the upper horizontal piece 5 and the front side of the lower horizontal piece 4 are not bonded, so the overlapping portion S2 in Fig. 13 has a shorter vertical width than the overlapping portion S1 in the first to third embodiments, and the vertical width from the horizontal edge 5b of the upper horizontal piece 5 to the lower edge 4d (the lower edge 2b of the corner bottom 2) of the lower horizontal piece 4 is longer than in the first to third embodiments, and the adhesive strength is improved by expanding the area of ​​adhesion from the horizontal edge 5b of the upper horizontal piece 5 to the lower edge 4d (the lower edge 2b of the corner bottom 2) of the lower horizontal piece 4 with the release adhesive R4 of the decorative paper 6 in the vertical direction. Therefore, since there is no horizontal release adhesive R3, the ease of opening when opening is improved.

[0161] Furthermore, when the peel-off adhesive R4 of the decorative paper 6 is stronger in adhesive strength than the peel-off adhesives R1, R2 of the corner bottom portion 2 of the packaging bag 1, the adhesive strength is maintained while there is no horizontal peel-off adhesive R3, improving ease of opening when opening the bag.

[0162] Thereafter, the packaging bag 1 can be opened by opening the lower horizontal piece 4 downward (in the direction of arrow B) (see FIG. 6). That is, since the lower horizontal piece 4 is adhered to the left and right lower halves of the large isosceles triangular portions 3, 3 by peelable adhesives R1, R1, the lower horizontal piece 4 can be opened downward relatively easily.

[0163] In this case, since no conventional cutting tape is used, the cutting tape itself becomes waste in the past, but since no cutting tape is used, no waste is generated. Moreover, in the past, the decorative paper was cut horizontally from top to bottom with the cutting tape, so paper pieces were generated at the cut part, and these paper pieces sometimes entered the inside of the packaging bag 1, but in the present invention, the decorative paper 6 remains attached to the upper horizontal piece 5, so no waste is generated, and since the decorative paper 6 is not cut with the cutting tape, no paper pieces are generated, and the paper pieces do not enter the packaging bag 1.

[0164] In addition, conventionally, it was necessary to divide the decorative paper 6 in two with cutting tape and then open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper in two with the cutting tape, opening the upper horizontal piece upwards, and opening the lower horizontal piece downwards.

[0165] In contrast, in the present invention, when the decorative paper 6 is pulled upward (in the direction of arrow A) (vertical direction, perpendicular to the longitudinal direction of the decorative paper 6), the upper horizontal piece 5 is also opened, so that the packaging bag can be opened with two actions: pulling the decorative paper 6 upward and opening the lower horizontal piece 4 downward, making it possible to open the packaging bag in a shorter time.

[0166] In addition, the decorative paper was previously peeled off horizontally (horizontally, parallel to the longitudinal direction), and the decorative paper had to be completely separated from the corner bottom, and the upper and lower horizontal pieces had to be opened up and down. When the decorative paper was peeled off horizontally in the past, the decorative paper itself became garbage and paper scraps were also generated, which was not preferable. In the present invention, the rectangular decorative paper 6 is peeled off upward (vertically, in a direction perpendicular to the longitudinal direction of the decorative paper 6), and the decorative paper 6 and the upper horizontal piece 5 are both peeled off upward together with the upper horizontal piece 5, so the peeling distance of the decorative paper 6 is short, and since the rectangular decorative paper 6 is attached to the upper horizontal piece 5, the decorative paper 6 itself does not become garbage, and the generation of paper scraps can be minimized. In addition, since there is no peeling adhesive R3, the ease of opening can be improved.

[0167] As described above, the packaging bag 1 of the fourth embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S2) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a center In a packaging bag (1) having a central rectangular portion (2') and an angular bottom portion (2) in which left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular portion (2'), release adhesive (R1, R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and release adhesive (R2, R2) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). ) is applied to the upper horizontal piece (5) and the lower horizontal piece (4) along the lower horizontal line (T1) and the upper horizontal line (T2) as described above, and the corner bottom portion (2) is formed by folding and adhering the upper horizontal piece (5) and the lower horizontal piece (4) along the lower horizontal line (T1) and the upper horizontal line (T2) as described above, and the overlapping portion (S2) is formed to have a narrower vertical width than the overlapping portion (S1) described in any one of the first to third above, and a rectangular decorative paper (decorative piece) (6) is attached to the area of ​​the rectangular portion (2') on the corner bottom portion (2), and the back surface 6" of the decorative paper (decorative piece) (6) is applied with adhesive glue (L) facing the center of the upper horizontal piece (5), and the rest of the back surface (6") is applied with release glue (R4), and further, the back surface (6") of the decorative paper (6) has a finger insertion portion (9) along the lower edge (2b) of the corner bottom portion (2) where release glue (R4) is not applied.

[0168] Fifth embodiment Next, a fifth embodiment will be described with reference to FIGS. The method of folding the corner bottom portion 2 of the packaging bag 1 and the method of applying the release adhesives R1 to R3 are the same as those in Fig. 1 and Fig. 2 (first embodiment), so the explanation will be omitted (i.e., the horizontal release adhesive R3 is used to bond the upper horizontal piece 5 and the lower horizontal piece 4). The materials of the packaging bag 1 and the decorative paper (decorative piece) 6 are also the same as those in the first embodiment, and the components of the adhesive adhesive L and the release adhesives R1 to R4 are also the same as those in the first embodiment, so the explanation will be omitted.

[0169] Furthermore, the adhesive strengths of the release adhesives R1 to R3 used for the corner bottom portion 2 of the packaging bag 1 and the release adhesive R4 used for the decorative paper 6 may be the same, but the adhesive strength of R4 after peeling may be stronger than that of the release adhesives R1 to R3 (lower than the adhesive strength of the fixing adhesive L). This point is the same as that of the first embodiment.

[0170] Also, since the adhesive area of the release adhesive R4 of the decorative paper 6 is large (substantially the entire rectangular portion 2' of the corner bottom portion 2), the corner bottom portion 2 of the packaging bag 1 may be the corner bottom portion 2 of the fourth embodiment (the vertical width of the overlapping portion S2 is narrow (S2 < S1) and there is no horizontal release adhesive R3). FIGS. 17(a) to (d) show an example of the corner bottom portion 2 of the fourth embodiment.

[0171] FIGS. 16(a) to (d) show the decorative paper 6. The front surface 6' of the decorative paper 6 is not coated with any adhesive, but the fixing adhesive L and the release adhesive R4 are separately applied to the back surface 6". The left side 6c on the left side and the right side 6d on the right side of the decorative paper 6 are defined, and in FIG. 16(b), the portion corresponding to the two-dot chain line 7 on the right side of the corner bottom portion 2 is defined as the right side 6d'.

[0172] For the decorative paper 6 in FIG. 16(a), a vertically triangular fixing adhesive L having a similar shape to the inner triangular portion 3" is applied to the portion corresponding to the inner triangular portion 3" on the right side of the corner bottom portion 2 (the apex portion 3b is on the inner side), and the release adhesive R4 is applied to substantially the entire back surface 6" except for this. That is, a vertically triangular fixing adhesive L within a predetermined range is applied at least in the vertical direction along the right side 6d of the decorative piece 6. The predetermined range is, for example, about 10 mm from the right side 6d of the decorative paper 6, and it can be said that the fixing adhesive L is located at the right end (or left end) of the decorative paper 6.

[0173] Also, a finger insertion portion 9 is provided in the short direction on the left side of the release adhesive R4 (the left side 6c, the left edge 2c of the rectangular portion 2' of the corner bottom portion 2), that is, in a range where a vertically trapezoidal release adhesive R4 is not applied.

[0174] The decorative paper 6 in Figure 16 (b) extends longitudinally only to the right side up to the vertex 3a on the right side of the corner bottom 2 (the vertical width does not change), and a diamond-shaped (similar shape to the inner triangular portion 3" and the outer triangular portion 3') adhesive glue L is applied to the inner triangular portion 3" and the outer triangular portion 3' on the right side of the corner bottom 2, and release adhesive R4 is applied to almost the entire back surface 6" otherwise (release adhesive R4 is not applied to the extended portion at the right end). In other words, a diamond-shaped adhesive glue L is applied at least within a predetermined range in the vertical direction along the right side 6d of the decorative piece 6. The predetermined range is, for example, about 20 mm (for example, about ±10 mm) in the left-right direction from the right side 6d' of the decorative paper 6, and it can be said that the adhesive glue L is located at the right end (or left end) of the decorative paper 6.

[0175] In addition, on the left side (left side 6c) of the release adhesive R4 in the short direction (left edge 2c of the rectangular portion 2' of the corner bottom 2), there is provided an area, for example a vertical trapezoidal area, where the release adhesive R4 is not applied, i.e., a finger insertion area 9.

[0176] The decorative paper 6 in Figure 16 (c) has adhesive glue L applied in a rectangular shape, for example about 10 mm to the left from the lower edge 2" (the lower end of the right side 6d) of the dotted line 7 of the corner bottom 2, and release glue R4 applied to almost the entire back surface 6". In other words, a rectangular adhesive glue L is applied at least over a predetermined range in the vertical direction along the right side 6d of the decorative piece 6. It can be said that the adhesive glue L is located at the right end (or left end) of the decorative paper 6. Furthermore, the left end of the adhesive glue L does not reach the right vertex 3b of the corner bottom 2, but ends slightly to the right.

[0177] In addition, on the left side (left side 6c) of the release adhesive R4 in the short direction (left edge 2c of the rectangular portion 2' of the corner bottom 2), there is provided an area, for example a vertical trapezoidal area, where the release adhesive R4 is not applied, i.e., a finger insertion area 9.

[0178] The decorative paper 6 in FIG. 16(d) has a portion of the adhesive L that is a combination of (a) and (c), and the adhesive L is applied within the range of the inner triangular portion 3" on the right side of the corner bottom portion 2 (the triangular adhesive L in (a)) and the rectangular adhesive L in (c) (for example, a width of about 10 mm from the lower edge 2" (the lower end of the right side 6d) to the left). That is, the adhesive L is applied at least in a predetermined range in the vertical direction along the right side 6d of the decorative piece (6). It can be said that the adhesive L is located at the right end (or left end) of the decorative paper 6, and a protrusion is provided in the center of the left end of the adhesive L. In addition, on the left side (left side 6c) of the release adhesive R4 in the short direction (the left edge 2c of the rectangular portion 2' of the corner bottom portion 2), for example, a vertical trapezoidal area where the release adhesive R4 is not applied, i.e., a finger insertion area 9, is provided.

[0179] In the above embodiment, an example is shown in which the adhesive glue L is on the right side (right side 6d) and the finger insertion section 9 is on the left side (left side 6c, left edge 2c of the rectangular section 2' of the corner base 2), but the left and right may be reversed. That is, the adhesive glue L may be on the left side (left side 6c) and the finger insertion section 9 may be on the right side (right side 6d, right edge 2d of the rectangular section 2' of the corner base 2).

[0180] The decorative papers 6 of FIGS. 16(a) to 16(d) attached to the rectangular portion 2' of the square bottom portion 2 are shown in FIGS. 17(a) to 17(d).

[0181] In FIG. 17(a), adhesive glue L (triangular) is adhered to the inner triangular portion 3″ on the right side of the corner base 2, and peelable glue R4 is adhered to almost the entire area of ​​the corner base 2, and a finger insertion portion 9 is provided on the left side 6c. In Figure 17(b), adhesive glue L (diamond-shaped) is adhered to the inner triangular portion 3" and outer triangular portion 3' on the right side of the corner bottom 2, and peel-off glue R4 is adhered to almost the entire area of ​​the corner bottom otherwise, and a finger insertion area 9 is provided on the left side 6c.In this case, the upper and lower corners of the right side 6d of the decorative paper 6 are raised above the corner bottom 2. In Figure 17 (c), adhesive glue L (rectangular) is adhered to a portion of the inner triangular portion 3" on the right side of the corner bottom portion 2, a portion of the right side of the right-angled triangular portion 5a on the right side of the upper horizontal piece 5, and a portion of the right side of the right-angled triangular portion 4a on the right side of the lower horizontal piece 4, and peel-off glue R4 is adhered to almost the entire area of ​​the corner bottom portion 2, and a finger insertion portion 9 is provided on the left side 6c. In Figure 17 (d), adhesive glue L (which is roughly rectangular but has a protrusion in the center of the left end) is adhered to the inner triangular portion 3" on the right side of the corner bottom portion 2, a part of the right side of the right-angled triangular portion 5a on the right side of the upper horizontal piece 5, and a part of the right side of the right-angled triangular portion 4a on the right side of the lower horizontal piece 4, and peel-off glue R4 is adhered to almost the entire area of ​​the corner bottom portion 2, and a finger insertion portion 9 is provided on the left side 6c.

[0182] To open the packaging bag of Figures 17(a) to (c), as shown in Figure 18, insert your finger into the finger insertion section 9 on the left side of the decorative paper 6 and peel off the decorative paper 6 in a horizontal direction to the right (parallel to the longitudinal direction of the decorative paper 6).Since the peel-off adhesive R4 on the back side of the decorative paper 6 is in a different direction from the opening direction of the upper horizontal piece 5 and the lower horizontal piece 4 (the direction of arrow A or arrow B), the peel-off adhesive R4 will peel off from the surfaces of the upper horizontal piece 5 and the lower horizontal piece 4, and only the decorative paper 6 can be peeled off in the horizontal direction.

[0183] Furthermore, even if the adhesive strength of the peel-off glue R4 is stronger than that of the peel-off glues R1 to R3 that make up the corner bottom portion 2, the opening direction of the decorative paper 6 (horizontal direction parallel to the longitudinal direction) is different from the opening direction of the upper horizontal piece 5 (direction of arrow A perpendicular to the longitudinal direction of the decorative paper 6) and the opening direction of the lower horizontal piece 4 (direction of arrow B perpendicular to the longitudinal direction of the decorative paper 6), so that even if the adhesive strength of the peel-off glue R4 is stronger than that of the peel-off glues R1 to R3, it is possible to peel the decorative paper 6 from the corner bottom portion 2.

[0184] Then, when the decorative paper 6 is peeled off up to the portion of the adhesive L on the right side, the adhesive strength of the adhesive L is very high, so the unsealing operation of the decorative paper 6 stops at the left end of the adhesive L.

[0185] Thereafter, the packaging bag 1 can be opened by opening the upper horizontal piece 5 upward (in the direction of arrow A) and opening the lower horizontal piece 4 downward (in the direction of arrow B) (in this case, if the upper horizontal piece 5 is on top and the lower horizontal piece 4 is on the bottom, this order should be followed, but if the upper horizontal piece 5 is on the bottom and the lower horizontal piece 4 is on top, the upper horizontal piece 4 can be opened downward first and then the upper horizontal piece 5 can be opened upward, thereby opening the packaging bag).

[0186] In addition, the above embodiment describes the case where the decorative paper 6 is opened from left to right, but the same applies when the adhesive L is provided on the left side and the finger insertion portion 9 is provided on the right side, and the decorative paper 6 is opened horizontally from right to left.

[0187] In this case, since no conventional cutting tape is used, the cutting tape itself would become waste in the past, but since no cutting tape is used, no cutting tape waste is generated. Moreover, in the past, the decorative paper was cut horizontally from top to bottom with a cutting tape, so paper scraps were generated from the cut parts, and these paper scraps could enter the inside of the packaging bag 1, but in the present invention, the decorative paper 6 remains attached to the right (or left) side of the corner bottom 2 with the adhesive L, so no waste of the decorative paper 6 is generated, and since the decorative paper 6 is not cut with the cutting tape, no paper scraps are generated, and the paper scraps do not enter the packaging bag 1.

[0188] In addition, in the past, it was necessary to divide the decorative paper 6 horizontally into upper and lower halves using cutting tape, and then to open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper horizontally into two with the cutting tape, opening the upper horizontal piece to the top, and opening the lower horizontal piece to the bottom.

[0189] In contrast, the present invention requires three actions: peeling the decorative paper 6 horizontally, pulling the upper horizontal piece 5 upward, and opening it downward together with the lower horizontal piece 4. However, it is believed to be superior to conventional methods in that it does not use cutting tape, the decorative paper 6 does not become waste, the decorative paper 6 is not cut, and no paper scraps are produced.

[0190] In addition, in the past, the decorative paper had to be completely separated from the corner bottom and the upper and lower horizontal pieces had to be opened up and down, and when the conventional decorative paper was peeled off horizontally, it separated from the corner bottom and the decorative paper itself became waste, which was not preferable. In the present invention, the decorative paper 6 is peeled off horizontally, but since the decorative paper 6 is adhered to the corner bottom 2 with adhesive L and does not separate, the decorative paper 6 itself does not become waste and the generation of paper waste can be minimized.

[0191] When the square bottom portion 2 of the fourth embodiment is used, the peeling adhesive R3 is not present, so that the ease of opening can be improved.

[0192] Therefore, the packaging bag of the fifth embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and a rectangular shape is formed in the center. In a packaging bag (1) having a rectangular portion (2') and a corner bottom portion (2) on the left and right of which are formed left and right outer triangle portions (3', 3') of the large isosceles triangle portion (3, 3), a release glue (R1) is applied to each surface of the left and right right-angled triangle portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to each surface of the left and right right-angled triangle portions (5a, 5a) of the upper horizontal piece (5), and a release glue (R3) is applied to each surface of the left and right right-angled triangle portions (5a, 5a) of the upper horizontal piece (5). a peel-off adhesive (R3) is applied horizontally to the surface of the lateral edge (5b) of the upper horizontal piece (5) and the lower horizontal piece (4) are folded and bonded along the lower horizontal line (T1) and the upper horizontal line (T2) as described above to form the angular bottom portion (2), and a rectangular decorative piece (decorative paper) (6) is attached to the area of ​​the rectangular portion (2') on the angular bottom portion (2). A predetermined range of adhesive glue (L) is applied to the back surface (6") of the decorative piece (6) in at least the vertical direction along the right side (6d) or left side (6c) of the decorative piece (6), and the remaining portion is applied with peel-off adhesive (R4). Furthermore, a finger insertion portion (9) where peel-off adhesive (R4) is not applied is provided on the back surface (6") of the decorative piece (6) along the left edge (2c) or right edge (2d) of the rectangular portion (2') of the angular bottom portion (2).

[0193] In addition, the overlapping portion (S2) is formed to have a narrower vertical width than the overlapping portion (S1) of any of the embodiments described above in the first to third embodiments, and the release adhesive (R3) is not applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5).

[0194] Sixth embodiment Next, a sixth embodiment will be described with reference to FIG. The folding method of the corner bottom portion 2 of the packaging bag 1 and the application method of the release adhesives R1 to R3 are the same as those in FIGS. 1 and 2 (first embodiment), and thus the description thereof is omitted (that is, the horizontal release adhesive R3 is used for adhering the upper side horizontal piece 5 and the lower side horizontal piece 4). Also, the materials of the packaging bag 1 and the decorative paper (decorative piece) 6 are the same as those in the first embodiment, and the components of the fixing adhesive L and the release adhesives R1 to R4 are also the same as those in the first embodiment, and thus the description thereof is omitted.

[0195] Incidentally, the adhesive strengths of the release adhesives R1 to R3 used for the corner bottom portion 2 of the packaging bag 1 and the release adhesive R4 used for the decorative paper 6 may be the same, but the adhesive strength of R4 after peeling may be stronger than that of the release adhesives R1 to R3 (lower than the adhesive strength of the fixing adhesive L). This point is the same as that in the first embodiment.

[0196] Also, since the adhesive area of the release adhesive R4 of the decorative paper 6 is large (substantially the entire rectangular portion 2' of the substantially corner bottom portion 2), the corner bottom portion 2 of the packaging bag 1 may be the corner bottom portion 2 of the fourth embodiment (the vertical width of the overlapping portion S2 is narrow (S2 < S1) and there is no horizontal release adhesive R3). Incidentally, FIGS. 19(b) and 20 show the case where the corner bottom portion 2 is of the first embodiment.

[0197] As shown in FIG. 19(a), a vertical linear perforation 8 is provided at the center of the decorative paper 6 (the perforation 8 is a single perforation), and no adhesive is applied to the front surface 6', but the fixing adhesives L, L (rectangular shape) and the release adhesive R4 are separately applied to the back surface 6". The perforation 8 is provided linearly from the upper side 6a to the lower side 6b, and the perforation 8 penetrates through the front and back of the decorative paper 6. Incidentally, the perforation 8 may be a perforation (weakening line) that does not penetrate through the front and back of the decorative paper 6. Also, the perforation 8 is usually provided in the vertical direction at the center, but may be provided in the vertical direction at a position shifted to the left or right direction from the center. Also, the perforation 8 may be provided in the diagonal direction in the vertical direction. In this case, the fixing adhesives L, L are applied to two locations on the left and right of the decorative paper 6 in the same manner as in FIG. 19(a).

[0198] On both the left and right sides 6c, 6d of the back surface 6" of the decorative paper 6, adhesive glue L, L is applied in a rectangular shape, for example about 10 mm inward from the left and right sides 6c, 6d, and release glue R4 is applied to the remaining part of the back surface 6". In addition, on the back surface 6" of the lower side 6b of the decorative paper 6, a finger insertion area 9 (along the lower edge 2b of the corner bottom 2) which is not coated with release glue R4 and has a triangular shape, for example, is provided. In this case, the adhesive glue L and the finger insertion area 9 may be of any shape, and the finger insertion area 9 may be provided on the upper side 6a of the decorative paper 6.

[0199] Moreover, finger insertion section 9 may be provided in a triangular shape along perforation 8 (see, for example, FIG. 21(b)).

[0200] Such decorative paper 6 is attached to the rectangular portion 2' of the corner bottom 2 as shown in Figure 19 (b). In this case, adhesive glue L is adhered to a portion of the right inner triangular portion 3" of the corner bottom 2, a portion of the right right-angled triangular portion 5a of the upper horizontal piece 5, and a portion of the right side of the right right-angled triangular portion 4a of the lower horizontal piece 4, and further, adhesive glue L is adhered to a portion of the left inner triangular portion 3" of the corner bottom 2, a portion of the left right-angled triangular portion 5a of the upper horizontal piece 5, and a portion of the left side of the left right-angled triangular portion 4a of the lower horizontal piece 4. In addition, release glue R4 is adhered to the remaining portions, almost the entire area of ​​the upper horizontal piece 5 and lower horizontal piece 4 of the corner bottom 2, and portions of the inside of the left and right inner triangular portions 3",3".

[0201] To open the packaging bag 1 thus constructed, insert a finger into the finger insertion section 9 on the lower side 6b of the decorative paper 6 (the lower edge 2b of the square bottom 2) and divide the decorative paper 6 into two parts, left and right, upward along the perforation 8 (if the finger insertion section 9 is on the upper side 6a, insert a finger into the finger insertion section 9 on the upper side 6a (along the upper edge 2a of the square bottom 2) and divide the decorative paper 6 into two parts, left and right, downward along the perforation 8; if the finger insertion section 9 is provided along the perforation 8, open the perforation 8 vertically), and peel off the left half of the decorative paper 6e and the right half of the decorative paper 6f in the left-right direction (see FIG. 20). That is, peel off the left half of the decorative paper 6e to the left (parallel to the horizontal direction) and peel off the right half of the decorative paper 6f to the right (parallel to the horizontal direction). The peel-off adhesive R4 of the decorative paper 6 is different from the opening direction (the direction of arrow A perpendicular to the longitudinal direction of the decorative paper 6) for the upper horizontal piece 5 and different from the opening direction (the direction of arrow B perpendicular to the longitudinal direction of the decorative paper 6) for the lower horizontal piece 4, so that the peel-off adhesive R4 peels off from the surfaces of the upper horizontal piece 5 and the lower horizontal piece 4.

[0202] Furthermore, even if the adhesive strength of the peel-off adhesive R4 is stronger than that of the peel-off adhesives R1 to R3 that make up the corner bottom portion 2, the opening direction of the decorative paper 6 (the left-right direction parallel to the longitudinal direction of the decorative paper 6) is different from the opening direction of the upper horizontal piece 5 (the direction of arrow A) and the opening direction of the lower horizontal piece 4 (the direction of arrow B), so the peel-off adhesive R4 will peel off from the corner bottom portion 2 and the decorative paper 6 can be peeled off.

[0203] Furthermore, when the left half of the decorative paper 6e and the right half of the decorative paper 6f are opened in the left-right direction, the adhesive strength of the adhesive L,L is high in the portion of the adhesive L,L, so the opening of the decorative paper 6e, 6f stops at the inner end of the adhesive L,L. After that, the upper horizontal piece 5 is opened upward (in the direction of arrow A), and then the lower horizontal piece 4 is opened downward (in the direction of arrow B), so the packaging bag 1 can be opened. Although the upper horizontal piece 5 and the lower horizontal piece 4 have a small amount of adhesive L at both the left and right ends, the portion of the adhesive L is narrow, so the upper horizontal piece 5 and the lower horizontal piece 4 can be opened upward and downward (the order of the upper horizontal piece 5 and the lower horizontal piece 4 may be reversed).

[0204] In this case, since the conventional cutting tape is not used, the cutting tape itself becomes waste, but since the cutting tape itself is not used, no waste from the cutting tape is generated. Moreover, in the present invention, the decorative paper 6e, 6f remains attached to the left and right sides of the corner bottom 2, so no waste from the decorative paper 6 is generated, and since the decorative paper 6 is divided vertically into two halves at the perforation 8, and the division range (short side direction) is short, the decorative paper 6 is not divided horizontally into two by the cutting tape, so the generation of paper scraps can be minimized, and paper scraps do not enter the packaging bag 1.

[0205] In addition, conventionally, it was necessary to divide the decorative paper 6 horizontally into two, upper and lower, using cutting tape, and then to open the upper and lower horizontal pieces, which required at least three actions: dividing the decorative paper horizontally into two with the cutting tape, opening the upper horizontal piece upwards, and opening the lower horizontal piece downwards.

[0206] In contrast, the present invention requires approximately three actions: dividing the decorative paper 6 in two along the perforation 8 in the middle, pulling the upper horizontal piece 5 upward, and opening it downward together with the lower horizontal piece 4. However, since no cutting tape is used, fewer paper scraps are produced and the invention is considered to be superior to conventional methods.

[0207] In addition, in the past, the decorative paper had to be completely separated from the bottom corner and the upper and lower horizontal pieces had to be opened up and down, and when the conventional decorative paper was peeled off horizontally, it completely separated from the bottom corner and the decorative paper itself became waste, which was not preferable. In the present invention, the decorative paper 6 is peeled off horizontally, but the half of the decorative paper 6e, 6f is adhered to each bottom 2 with adhesive L, L and does not separate, so the decorative paper 6 itself does not become waste and the generation of paper scraps can be minimized.

[0208] As described above, the packaging bag of the sixth embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4), and the central rectangular portion (2') and the rectangular portion (2') are folded downward. In a packaging bag (1) having an angular bottom portion (2) in which the left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the shaped portion (2'), a release glue (R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), a release glue (R2) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5), and a release glue (R3) is applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5). ) is applied to the upper horizontal piece (5) and the lower horizontal piece (4) along the lower horizontal line (T1) and the upper horizontal line (T2) as described above, and the corner bottom portion (2) is formed by folding and bonding the upper horizontal piece (5) and the lower horizontal piece (4) along the lower horizontal line (T1) and the upper horizontal line (T2) as described above. A rectangular decorative piece (decorative paper) (6) is attached to the area of ​​the rectangular portion (2') on the corner bottom portion (2). The decorative piece (6) is sewn by a sewing machine that divides the decorative piece (6) into two parts, left and right, in the vertical direction or diagonally to the vertical direction. A mesh (8) is formed, and the back surface (6") of the decorative piece (6) is coated with adhesive glue (L, L) at least in a predetermined range in the vertical direction along the right side (6d) and left side (6c) of the decorative piece (6), and the remaining parts are coated with release glue (R4). Furthermore, the back surface (6") of the decorative piece (6) is provided with a finger insertion portion (9) along the lower edge (2b) or upper edge (2a) of the corner bottom portion (2) where release glue (R4) is not applied.

[0209] In addition, the overlapping portion (S2) is formed to have a narrower vertical width than the overlapping portion (S1) of the first embodiment, and is configured as a packaging bag in which the release adhesive (R3) is not applied horizontally to the surface of the horizontal edge (5b) of the upper horizontal piece (5).

[0210] Further, instead of the lower edge (2b) or the upper edge (2a) of the above-mentioned corner bottom part (2), the above-mentioned finger insertion part (9) is provided with a finger insertion part (9) on the back surface (6") side of the above-mentioned decorative piece (6) along the above-mentioned perforation (8) without applying the above-mentioned release adhesive (R4).

[0211] (The Seventh Embodiment) Other embodiments of the perforation 8 of the above-mentioned decorative paper 6 are shown in FIGS. 21 and 22. Since the folding method of the corner bottom part 2 of the packaging bag 1 and the application method of the release adhesives R1 to R3 are the same as those in FIGS. 1 and 2 (the first embodiment), the description thereof is omitted (that is, the horizontal release adhesive R3 is used for the adhesion between the upper horizontal piece 5 and the lower horizontal piece 4). Further, since the materials of the packaging bag 1 and the decorative paper (decorative piece) 6 are also the same as those in the first embodiment, and the components of the fixing adhesive L and the release adhesives R1 to R4 are also the same as those in the first embodiment, the description thereof is omitted.

[0212] In addition, the adhesion strengths of the release adhesives R1 to R3 used for the corner bottom part 2 of the packaging bag 1 and the release adhesive R4 used for the decorative paper 6 may be the same, but even if the adhesion strength of R4 after peeling is stronger than that of the release adhesives R1 to R3 (lower than the adhesion strength of the fixing adhesive L), it is acceptable. This point is the same as that in the first embodiment.

[0213] Further, since the application area of the release adhesive R4 of the decorative paper 6 is large (the same as in the fourth embodiment, see FIGS. 21(b) and 22(b)), or in the cases of FIGS. 21(c) and 22(c), since the total application area of the release adhesive R4 and the fixing adhesive L is large (the same as in the fourth embodiment), the corner bottom part 2 of the packaging bag 1 may be the corner bottom part 2 of the fourth embodiment (the vertical width of the overlapping part S2 is narrow (S2 < S1) and there is no horizontal release adhesive R3). Note that FIGS. 21(b)(c) and 22(b)(c) show examples of the corner bottom part 2 of the fourth embodiment.

[0214] On the back surface 6" of the above-mentioned decorative paper 6, a rectangular fixing adhesive L is applied so as to correspond to the surface of the above-mentioned upper horizontal piece 5, and the release adhesive R4 is applied otherwise (see FIGS. 21(b) and 22(b)).

[0215] The perforation 8 is an inverted trapezoidal perforation 8 (one perforation) similar to the upper horizontal piece 5 of the square bottom portion 2 (see Figs. 21(a) and (b)). In this case, the linear horizontal perforation 8a is provided below the horizontal edge 5b of the upper horizontal piece 5.

[0216] Alternatively, a straight perforation 8 is provided in the horizontal direction parallel to the longitudinal direction of the decorative paper 6 (see FIG. 22(a)). In the case of a straight horizontal perforation 8 (a single perforation), the perforation is provided below the horizontal edge 5b of the upper horizontal piece 5 (see FIG. 22(b)).

[0217] Furthermore, in the case of Figure 21 (b), an area (finger insertion area 9) where release adhesive R4 is not applied is provided on the back surface 6" of the decorative paper 6 at the central horizontal perforation 8a. Incidentally, in the case of a straight horizontal perforation 8, an area (finger insertion area 9) where release adhesive R4 is not applied is also provided at the central part of the back surface 6" (see Figure 22 (b)). The decorative paper 6 is then attached to the area of ​​the rectangular portion 2' of the corner bottom 2 of the packaging bag 1.

[0218] When opening the packaging bag 1 thus constructed, in the case of an inverted trapezoidal perforation 8, the decorative paper 6 is divided into two parts along the perforation 8 from the finger insertion portion 9, and then divided into two parts, upper and lower, within a range of about 5 mm along the perforation 8 (the upper part of the decorative paper 6 is inverted trapezoidal, and the lower part of the decorative paper 6 has triangular parts 6g, 6h remaining on both sides), and the upper part of the decorative paper 6 is opened upward (in the direction of arrow A) from the finger insertion portion 9. Then, the upper horizontal piece 5 of the decorative paper 6 is attached to it by the adhesive L, and thereafter, the triangular parts 6g, 6h are peeled downward from the corner bottom portion 2 (easy to peel off due to the peeling adhesive R4) and the lower horizontal piece 4 is opened downward (in the direction of arrow B) (because the lower divided piece of the decorative paper 6 is attached to the lower horizontal piece 4 by the peeling adhesive R4), and the packaging bag 1 can be opened in about three actions.

[0219] Furthermore, in the case of a straight horizontal perforation 8 (see FIG. 22(b)), when opening the packaging bag 1, the decorative paper 6 is divided into two parts, upward and downward, from the finger insertion portion 9 along the perforation 8, within a range of about 5 mm upward and downward, and the upper decorative paper 6 is opened upward (in the direction of arrow A) from the finger insertion portion 9 (see FIG. 22(b)). Then, the upper horizontal piece 5 is stuck together by the adhesive glue L, and thereafter, by opening the lower horizontal piece 4 downward (in the direction of arrow B) (because the lower divided piece of the decorative paper 6 is stuck to the lower horizontal piece 4 by the peel-off glue R4), the packaging bag 1 can be opened in about three actions.

[0220] In this case, since no conventional cutting tape is used, the cutting tape itself becomes waste in the past, but since no cutting tape is used, no cutting tape waste is generated. Moreover, in the present invention, the decorative paper 6 is divided into two, upper and lower, along the perforation 8, but the upper half of the decorative paper 6 remains attached to the upper horizontal piece 5 and the lower half of the decorative paper 6 remains attached to the lower horizontal piece 4, so no decorative paper 6 waste is generated.

[0221] Also, on the back surface 6'' of the decorative paper 6, within the range of the lower horizontal piece 4, a rectangular adhesive glue L may be applied in the left-right direction to the lower half of the lower horizontal piece 4 (see Figures 21(c) and 22(c)).

[0222] When configured in this manner, in the case of Figure 21(c), the decorative paper 6 is divided into upper and lower halves by approximately 5 mm along the inverted trapezoidal perforation 8, and when the inverted trapezoidal part of the decorative paper 6 is opened upward, it opens upward while adhering to the upper horizontal piece 5 with adhesive L, and the lower part of the decorative paper 6 is attached to the lower horizontal piece 4 with adhesive L, so that the lower half of the decorative paper 6 does not become waste.

[0223] In the case of Figure 22 (c), the decorative paper 6 is divided into approximately 5 mm sections at the top and bottom by a horizontal perforation 8, and when the upper part of the decorative paper 6 is opened upward, it opens upward while adhering to the upper horizontal piece 5 with adhesive L, and the lower part of the decorative paper 6 is attached to the lower horizontal piece 4 with adhesive L, so that the lower half of the decorative paper 6 does not become waste.

[0224] In this way, the packaging bag (1) of the seventh embodiment of the present invention has large isosceles triangular portions (3, 3) with vertices (3a, 3a) facing outward formed on the left and right sides of the opening (1'), the lower horizontal piece (4) is folded upward along the lower horizontal line (T1), and the upper horizontal piece (5) is folded downward along the upper horizontal line (T2), so that an overlapping portion (S1) is formed between the upper horizontal piece (5) and the lower horizontal piece (4). In a packaging bag (1) having a central rectangular portion (2') and an angular bottom portion (2) in which left and right outer triangular portions (3', 3') of the large isosceles triangular portion (3, 3) are formed on the left and right sides of the rectangular portion (2'), a release adhesive (R1) is applied to each surface of the left and right right-angled triangular portions (4a, 4a) of the lower horizontal piece (4), and a release adhesive (R2) is applied to each surface of the left and right right-angled triangular portions (5a, 5a) of the upper horizontal piece (5). a decorative piece (6) having a rectangular shape and a width that is longer than the width of the decorative piece (6) and a width that is shorter than the width of the decorative piece (6); a decorative piece (6) having a width that is shorter than the width of the decorative piece (6) and a width that is longer than the width of the decorative piece (6); a decorative piece (6) having a width that is shorter than the width of the decorative piece (6) and a width that is longer than the width of the decorative piece (6);

[0225] In addition, in the packaging bag (1) of this embodiment, the decorative piece (6) has a perforation (8) formed in an inverted trapezoid shape similar to the upper horizontal piece (5) that divides the decorative piece (6) into two parts, upper and lower, and the back surface (6") of the decorative piece (6) is coated with adhesive glue (L) in the center of the upper horizontal piece (5) and with release glue (R4) in the remaining parts. Furthermore, the back surface (6") of the decorative piece (6) is provided with a finger insertion portion (9) along the perforation (8) where release glue (R4) is not applied.

[0226] In addition, for the packaging bag (1) of the present embodiment, when the above cosmetic piece (6) is attached to the rectangular portion (2') of the above corner bottom portion (2), the fixing adhesive (L) is applied to the central portion of the above upper side horizontal piece (5), and the fixing adhesive (L) is applied to the portion of the lower side horizontal piece (4), and the release adhesive (R4) is applied to the other portions.

[0227] (Eighth Embodiment) Another embodiment of the perforation 8 of the above cosmetic paper 6 is shown in FIG. 23. Since the folding method of the corner bottom portion 2 of the packaging bag 1 and the application method of the release adhesives R1 to R3 are the same as those in FIGS. 1 and 2 (First Embodiment), the description is omitted. Also, the adhesive strengths of the release adhesives R1 to R3 used for the corner bottom portion 2 of the packaging bag 1 and the release adhesive R4 used for the cosmetic paper 6 may be the same, but the adhesive strength of R4 after peeling may be stronger than that of the release adhesives R1 to R3. This is the same as in the first embodiment. Also, since the application area of the release adhesive R4 of the cosmetic paper 6 is wide, the corner bottom portion 2 of the packaging bag 1 may be the corner bottom portion 2 of the fourth embodiment (the vertical width of the overlapping portion S2 is narrow (S2 < S1) and there is no horizontal release adhesive R3).

[0228] FIGS. 23(a) and (b) show a case where an inverted trapezoidal perforation 8 (one perforation 8) is provided on the cosmetic paper 6. Along the perforation 8, an area (finger insertion portion 9) where the release adhesive R4 is not applied is provided on the back surface 6" of the cosmetic paper 6, and a cut 11a (portion of the horizontal perforation 8a) or a cut 11b (portion of the inclined perforation 8) is provided along the perforation 8 corresponding to the portion of the finger insertion portion 9. Either the cut 11a or the cut 11b may be provided. That is, since the cuts 11a and 11b are not coated with the release adhesive R4 on the back surface 6" and are provided facing the range of the finger insertion portion 9, they can be easily erected. Also, the cuts 11a or 11b are provided in a semi-circular shape, a small square shape, etc. There is no limitation on the shape of the cuts 11a or 11b. This is the same for the sixth embodiment and the seventh embodiment as well.

[0229] FIG. 23(b) shows the state in which the slit 11a is raised, and raising the slit 11a serves as a handle when opening the package. The back surface 6" of the decorative paper 6 at the slit 11a has an area (finger insertion area 9) where the release adhesive R4 is not applied. The adhesive adhesive L and release adhesive R4 are the same as those in FIGS. 21(b) and (c).

[0230] When opening the packaging bag 1 constructed in this way, as shown in Fig. 23(b), in the case of a trapezoidal perforation 8, the notch 11a is raised, the decorative paper 6 is divided into two parts in an inverted trapezoidal shape along the perforation 8 from the finger insertion part 9 (about 5 mm is peeled off from the corner bottom part 2 in the vertical direction along the perforation 8), and the upper decorative paper 6 is opened upward (in the direction of the arrow A) from the finger insertion part 9 (see Fig. 22(b)). Then, the upper horizontal piece 5 is attached by the adhesive L, and then the lower horizontal piece 4 is opened downward (in the direction of the arrow B) (because the lower divided piece of the decorative paper 6 is attached to the lower horizontal piece 4 by the peelable adhesive R4), so that the packaging bag 1 can be opened in about three actions. In the case of Fig. 21(c), when the lower half of the decorative paper 6 is opened downward (in the direction of the arrow B), the lower horizontal piece 4 is attached by the adhesive L, so the lower half of the decorative paper 6 does not become garbage.

[0231] In this case, since no conventional cutting tape is used, the cutting tape itself would become waste in the past, but since no cutting tape is used, no cutting tape waste is generated. Moreover, in the present invention, although the decorative paper 6 is divided into two, the upper piece of the decorative paper 6 sticks to the upper horizontal piece 5, and the lower side of the decorative paper 6 remains stuck to the lower horizontal piece 4 by the peelable adhesive R4 (or adhesive adhesive L), so no decorative paper 6 waste is generated.

[0232] As described above, the packaging bag (1) of the eighth embodiment of the present invention has, in addition to the finger insertion portion (9), a cut (11a or 11b) provided in the decorative piece (6) in the portion of the decorative piece (6) where the release adhesive (R4) is not applied.

[0233] Ninth embodiment A ninth embodiment is shown in FIG. First, the finger insertion section 9 may be a narrow square (rectangular) shape as shown in Fig. 15(a). Also, instead of the finger insertion section 9, a protruding piece 10 having a rectangular shape, an inverted trapezoidal shape (rectangular shape), a semicircular shape, a triangular shape, or the like may be provided as shown in Fig. 15(b). If the finger insertion section 9 is the lower side 6b, the protruding piece 10 is provided so that the center of the lower side 6b protrudes outward, and if the finger insertion section 9 is the upper side 6a, the protruding piece 10 is provided so that the center of the upper side 6a protrudes outward. Also, if the finger insertion section 9 is the left side 6c or the right side 6d of the decorative paper 6, the protruding piece 10 can be provided on the left side 6c or the right side 6d.

[0234] In this case, no release adhesive is applied to the back surface of the protruding piece 10, no finger insertion section 9 is provided, and release adhesive R4 is applied along the lower side 6b, upper side 6a, left side 6c, and right side 6d. Also, both the finger insertion section 9 and the protruding piece 10 may be provided, or a small area may be provided at the base end of the protruding piece 10 where release adhesive R4 is not applied.

[0235] Even if the protruding portion 10 is provided in this manner, the decorative paper 6 can be peeled off from the protruding portion 10 in the upward direction (arrow A direction), the downward direction (arrow B direction), or the left and right directions, and the same effect as above can be achieved. The shape of the protruding piece 10 is not limited. As described above, the packaging bag (1) of the ninth embodiment of the present invention has, on the back side of the decorative piece (6), a protruding piece (10) on which no release adhesive (R4) is applied is provided opposite the finger insertion portion (9) instead of the finger insertion portion (9) on which no release adhesive (R4) is applied. EXAMPLES

[0236] Each packaging bag 1 having each square bottom portion 2 of the first to ninth embodiments described above (the square bottom portion 2 was adhered with peel-off adhesive and decorative paper 6 was attached) was subjected to the JIS Z 0217 1998 "Kraft paper bag drop test."

[0237] The packaging bags 1 were filled with powder and granular material, weighing 25 kg, and were dropped horizontally from a height of 1.2 m 10 times.

[0238] Experiments were conducted with each packaging bag 1 from the first to ninth embodiments, and even after being dropped 10 times, the decorative paper 6 at the bottom corner 2 remained attached, the bag did not break, and the adhesive strength of the peeling adhesive and the adhesive was at an acceptable level.

[0239] As described above, according to the present invention, when opening the packaging bag (1), inserting a finger into the finger insertion portion (9) of the decorative paper (decorative piece) (6) and peeling the decorative paper (6) upward (peel it in a direction perpendicular to the longitudinal direction of the decorative paper (6)), the upper horizontal piece (5) sticks to the decorative paper (6) and opens, and then the packaging bag (1) can be opened by pulling and peeling the lower horizontal piece (4) downward. This action is a two-action operation, and the operation is simple. In addition, the decorative paper (6) does not separate from the square bottom portion (2), and no cutting tape is used, so no waste is generated, and the decorative paper (6) is not cut, so there is no risk of the paper piece getting into the inside of the packaging bag (1).

[0240] In addition, when opening the packaging bag (1), if you insert your fingers into the upper finger insertion portion (9) of the decorative paper (decorative piece) (6) and peel the decorative paper (6) downward (peel it in a direction perpendicular to the longitudinal direction of the decorative paper (6)), the back surface (6") of the decorative paper 6 and the upper horizontal piece (5) are adhered with peelable adhesive (R4), so they peel off relatively easily, and the decorative paper (6) up to the fixed adhesive (L) is peeled off from the upper horizontal piece (5). After that, when the upper horizontal piece (5) is opened upward from its horizontal edge (5b), In both cases, the decorative paper (6) is pulled downward (in a direction perpendicular to the longitudinal direction of the decorative paper (6)) to open the lower horizontal piece (4) together with the lower horizontal piece (4), thereby opening the opening (1'). This operation involves three actions and is the same as the conventional one, but since the decorative paper (6) is not separated from the square bottom portion (2) and no cutting tape is used, no waste is generated, and since the decorative paper (6) is not cut, there is no risk of paper pieces entering the inside of the packaging bag (1).

[0241] In addition, since the overlapping portion (S2) is formed narrower in the vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, there is no need to provide the horizontal peeling adhesive (R3) provided in the first embodiment. When opening the packaging bag (1), inserting a finger into the finger insertion portion (9) of the decorative paper (decorative piece) (6) and peeling the decorative paper (6) upward (peel it in a direction perpendicular to the longitudinal direction of the decorative paper (6)), the upper horizontal piece (5) sticks to the decorative paper (6) and opens, and then the packaging bag (1) can be opened by peeling the lower horizontal piece (4) downward. This operation is a two-action operation, and the operation is simple. In addition, no waste is generated because no cutting tape is used, and the decorative paper (6) is not cut, so there is no risk of the paper piece entering the inside of the packaging bag (1). Furthermore, since no peeling adhesive (R3) is provided between the upper horizontal piece (5) and the lower horizontal piece (4), the ease of opening the package can be improved.

[0242] Furthermore, since the adhesive strength of the "release adhesive (R1 to R3) of the corner bottom portion (2) of the packaging bag (1)" and the "release adhesive (R4) of the decorative paper" is the same, the upper horizontal piece (5) adheres to the fixed adhesive (L) of the decorative paper (6) (first, second and fourth embodiments), or the lower horizontal piece (4) adheres to the fixed adhesive (L) of the decorative paper (6) (third embodiment), the above-mentioned effects can be obtained. Furthermore, when the adhesive strength is in the order of "adhesive adhesive (L) of the decorative paper" > "release adhesive (R4) of the decorative paper" > "release adhesives (R1-R3) of the corner bottom portion (2) of the packaging bag (1)", when the decorative paper (6) is peeled upward (when peeled in a direction perpendicular to the longitudinal direction of the decorative paper (6)) (first, second and fourth embodiments), the lower horizontal piece (4) is in the opposite direction to the opening direction, so the lower horizontal piece (4) does not peel off (see Figure 6), and when the decorative paper (6) is peeled downward (in a direction perpendicular to the longitudinal direction of the decorative paper (6)) (third embodiment), the upper horizontal piece (5) is in the opposite direction to the opening direction, so the upper horizontal piece (5) does not peel off (see Figure 11), and as a result, the above-mentioned effect can be obtained.

[0243] In addition, when the decorative piece (decorative paper) (6) is peeled off horizontally from the finger insertion portion (9) on the right side (6c) or left side (6d), the decorative piece (6) up to the fixed glue (L) is peeled off, and since the decorative piece (decorative paper) (6) remains attached to the corner bottom portion (2) without being separated by the fixed glue (L), the upper horizontal piece (5) can then be opened upward and the lower horizontal piece (4) can be opened downward to open the packaging bag (1). This operation is three actions, and is the same as the conventional one, but since no cutting tape is used and the decorative piece is not separated, no waste is generated, and since the decorative piece (6) is not cut, there is no risk of the paper piece getting into the inside of the packaging bag (1).

[0244] In addition, the overlapping portion (S2) is formed with a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the peel-off adhesive (R4) of the decorative piece (6) bonds almost the entire area of ​​the upper horizontal piece (5) and the lower horizontal piece (4), improving the adhesive strength. This eliminates the need for the horizontal peel-off adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0245] In addition, when the decorative piece (decorative paper) (6) is cut vertically along the perforation (8) and the decorative piece (6) is peeled off to the left and right, the left and right decorative pieces (6) are peeled off up to the left and right adhesives (L, L), and the adhesives (L, L) stop the opening of the decorative pieces (6) (6e, 6f), so that the packaging bag (1) can be opened by opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward. This operation is approximately three actions and is the same as the conventional method, but there is an advantage that no waste is generated because no cutting tape is used and the decorative piece (6) is not separated.

[0246] In addition, the overlapping portion (S2) is formed with a narrower vertical width than the overlapping portion (S1) described in any one of the first to third embodiments, and the peel-off adhesive (R4) of the decorative piece (6) adheres almost the entire surface of the upper horizontal piece (5) and the lower horizontal piece (4), improving the adhesive strength. This eliminates the need for the horizontal peel-off adhesive (R3) provided in the first to third embodiments, thereby improving the ease of opening the upper horizontal piece (5) and the lower horizontal piece (4).

[0247] In addition, since a finger insertion section (9) is provided, for example, in the center of the perforation (8), the perforation (8) can be torn from the center of the perforation (8) and the decorative piece (6) can be divided into two in the left-right direction from the finger insertion section (9), and then the packaging bag can be opened by opening the upper horizontal piece (5) upward and the lower horizontal piece (4) downward. At this time, the decorative piece (6) opens to the left and right, but since it is stopped by the adhesive (L, L), the decorative piece (6) does not become waste.

[0248] Also, by tearing the perforation (8) at the finger insertion section (9) along the perforation (8) of the decorative piece (6) and dividing the decorative piece (6) vertically into two halves, the upper horizontal piece (5) can be opened upward and the lower horizontal piece (4) downward along the horizontal edge (5b) of the lower horizontal piece (5), allowing the packaging bag to be opened. In this case, the decorative piece (6) does not become waste, and since no cutting tape is used, the cutting tape does not become waste.

[0249] In addition, the notch (11a or 11b) of the decorative piece (6) serves as a handle, making it easier to tear the perforation (8).

[0250] In addition, the divided lower part of the decorative piece (6) is adhered to the lower horizontal piece (4) with adhesive (L), so that the decorative piece (6) does not become waste since it sticks to the lower horizontal piece (4) and does not come off.

[0251] In addition, since there is only one perforation (8), when the perforation (8) is torn, only the decorative piece (6) is produced as waste, and the cut tape does not become waste.

[0252] Moreover, instead of the finger insertion portion (9), a protruding piece (10) on which no peeling adhesive (R3) is applied is provided, so that the decorative paper (6) can be easily peeled off from the protruding piece (10) upward or downward. [Industrial Applicability]

[0253] The packaging bag of the present invention can simplify the task of opening a large number of packaging bags 1, does not produce waste, and does not allow pieces of paper to get inside, making it extremely practical. [Explanation of symbols]

[0254] 1 Packaging bag 1' Opening 2 corner bottom 2a Upper edge 2b Lower edge 2c left edge 2d right edge 2' rectangular section 3 Large isosceles triangle 3' outer triangle 3a Apex 4 Lower side piece 4a Right triangle 5 Upper side piece 5a Right triangle part 6. Decorative paper (decorative pieces) 6' surface 6" back side 6c Left side 6d Right hand side 8 Perforations 9 Finger insertion section 10 protruding piece 11a,11b cutting depth T1 lower horizontal line T2 upper horizontal line S1, S2 overlapping area L Adhesive Glue R1, R2 peeling adhesive R3 Peeling adhesive R4 Peeling adhesive

Claims

1. a packaging bag having a corner bottom, in which large isosceles triangular portions with vertices facing outward are formed on the left and right sides of an upper opening of the bag, a lower horizontal piece is folded upward along a lower horizontal line parallel to the edge line of the upper opening and is adhered with release glue applied to the surfaces of the left and right right-angled triangular portions of the lower horizontal piece, and an upper horizontal piece is folded downward along an upper horizontal line parallel to the edge line of the upper opening so as to cover the lower horizontal piece and is adhered with release glue applied to the surfaces of the left and right right-angled triangular portions of the upper horizontal piece, an overlapping portion is formed between the upper horizontal piece and the lower horizontal piece, and A rectangular decorative piece is attached to the rectangular area on the corner bottom, The back surface of the decorative piece is provided with a finger insertion portion along the lower edge of the corner bottom portion where no release adhesive is applied, The back surface of the decorative piece is coated with adhesive in an inverted trapezoid shape facing the lower half of the upper horizontal piece, including the portion along the horizontal edge of the upper horizontal piece, and a release adhesive is applied to the back surface other than the area coated with the adhesive and the finger insertion portion; When a finger is inserted into the finger insertion section and the cosmetic piece is pulled upwardly and peeled off, the peel adhesive peels off while the cosmetic piece is attached to the upper horizontal piece, and the upper horizontal piece opens upwardly to become an opening. Packaging bag.

2. a packaging bag having a corner bottom, in which large isosceles triangular portions with vertices facing outward are formed on the left and right sides of an upper opening of the bag, a lower horizontal piece is folded upward along a lower horizontal line parallel to the edge line of the upper opening and is adhered with release glue applied to the surfaces of the left and right right-angled triangular portions of the lower horizontal piece, and an upper horizontal piece is folded downward along an upper horizontal line parallel to the edge line of the upper opening so as to cover the lower horizontal piece and is adhered with release glue applied to the surfaces of the left and right right-angled triangular portions of the upper horizontal piece, an overlapping portion is formed between the upper horizontal piece and the lower horizontal piece, and A rectangular decorative piece is attached to the rectangular area on the corner bottom, The back surface of the decorative piece is provided with a finger insertion portion along the lower edge of the corner bottom portion where no release adhesive is applied, The back surface of the decorative piece is coated with adhesive in an inverted trapezoid shape facing the lower half of the upper horizontal piece, including the portion along the horizontal edge of the upper horizontal piece, and a release adhesive is applied to the area where the adhesive adhesive is applied and the back surface other than the finger insertion portion (excluding the boundary portion with the adhesive adhesive), When a finger is inserted into the finger insertion section and the cosmetic piece is pulled upwardly and peeled off, the peel adhesive peels off while the cosmetic piece is attached to the upper horizontal piece, and the upper horizontal piece opens upwardly to become an opening. Packaging bag.

3. The upper horizontal piece and the lower horizontal piece are bonded together with a release adhesive that is horizontally applied to the surface of the horizontal edge of the upper horizontal piece. The packaging bag according to claim 1 or 2.

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