Packaging bags

Abstract

To provide a packaging bag imparted with a simple re-sealing function.SOLUTION: A packaging bag 1 includes a bag body 2, a horizontal seal portion 6, an unsealing portion 8 for forming an opening 22, and a re-sealing portion 10 formed from a band-shaped packaging material 12 different from the bag body 2. The re-sealing portion 10 has: a lateral adhesive portion 14 formed by adhering one end of the band-shaped packaging material 12 on a side of the unsealing portion 8 to the bag body 2 along a lateral direction X; a pair of vertical adhesive portions 16 formed by adhering both ends 12b of the band-shaped packaging material 12 in the lateral direction X to the bag body 2 along a vertical direction Y, respectively; and a folded portion 18 formed on the band-shaped packaging material 12 by the lateral adhesive portion 14 and each vertical adhesive portion 16, wherein the opening 22 is resealed by inverting and folding a folded portion 18 to a back surface 1b of the bag body 2, which is an opposite side of a forming surface 1a on which the lateral adhesive portion 14 is formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging bag, and more particularly to a packaging bag having a resealable function. [Background technology]

[0002] Patent Document 1 discloses a packaging bag that includes a bag body formed from a film-like packaging material and a vertical seal formed by sealing the seam of the packaging material in the vertical direction of the bag body. This packaging bag also includes an opening guide portion, a slit, and an opening prevention portion. The opening guide portion extends in the circumferential direction of the bag body, approximately perpendicular to the vertical seal portion, and is formed by sealing at least the overlapping base portions of the packaging material while folding it into pleats, thereby guiding the progression of tearing of the packaging material in the direction along the base portion when the bag body is opened.

[0003] The slit is formed in the vertical seal at a position opposite the tip from the base of the opening guide portion, allowing the vertical seal to be torn in the transverse direction when the bag body is opened, thereby causing the tear in the vertical seal to reach the base of the opening guide portion. The opening prevention portion is formed by sealing the packaging material folded over on both side edges of the bag body over an area that includes at least the opening guide portion, and prevents the packaging material from breaking along the opening guide portion when the bag body is opened.

[0004] In the above-mentioned packaging bag, when the portion of the bag body above the opening guide portion is cut off, a wide opening guide portion remains around the cut edge. Next, with the contents still remaining in the bag body, the cut edge of the bag body is flattened, and the upper corners on both sides of the bag body in the width direction are folded back diagonally together with the opening guide portion. The folding direction is the back surface of the bag body (the surface on which the vertical seal portion is formed). The folding range in the vertical direction is about the width of the opening guide portion.

[0005] Next, by folding the upper corners of the bag body diagonally, the width of the cut edge becomes correspondingly narrower. In this state, by folding the opening guide portion located on the surface of the bag body inward from its base, the opening guide portion can be easily placed over the narrowed cut edge. Next, by adjusting the shape of the folded opening guide portion, the cut edge of the bag body is capped by the fold of the opening guide portion, making it possible to reseal the bag body firmly (see paragraphs 0074-0077, Figures 9 and 10 of the publication).

[0006] Consumers who purchase frozen foods or the like packaged in a packaging bag generally do not require the packaging bag to be completely sealed and resealed after opening, and often simply reseal the opening with a fastener such as a rubber band or clip. The packaging bag described in Patent Document 1 mentioned above can be resealed without using a fastener. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5340577 Summary of the Invention [Problem to be solved by the invention]

[0008] However, to reseal the packaging bag of Patent Document 1, the upper corner of the bag body must be folded diagonally, and then the opening guide portion must be folded back, which makes resealing time-consuming. Furthermore, because the upper corner of the bag body must be folded diagonally, the volume of the bag body is reduced by the folded portion. In particular, in the case of packaging bags in which the contents are placed on a tray, there is a problem that, when resealed, an empty space is created above the bag body where the tray cannot be inserted. Therefore, there is a demand for a packaging bag that can be easily resealed with fewer folds and without leaving an empty space.

[0009] The present invention has been made in view of the above problems, and has an object to provide a packaging bag that can be provided with a simple resealing function. [Means for solving the problem]

[0010] In order to achieve the above object, a packaging bag according to one embodiment comprises a bag body formed by molding packaging material into a tubular packaging material; a horizontal seal portion formed by sealing the longitudinal ends of the bag body in the horizontal direction; a tear-open portion formed on the bag body at a position in the vertical direction adjacent to the horizontal seal portion, which allows an opening to be formed in the bag body by tearing the bag body in the horizontal direction; and a reseal portion formed from a strip-shaped packaging material separate from the bag body and provided at a predetermined position on the bag body separated from the opening portion in the vertical direction of the horizontal seal portion, wherein the reseal portion has a horizontal adhesive portion formed by bonding one end of the strip-shaped packaging material on the opening-opening side to the bag body along the horizontal direction, a pair of vertical adhesive portions formed by bonding both ends of the strip-shaped packaging material in the horizontal direction to the bag body respectively along the vertical directions, and a fold-back portion formed on the strip-shaped packaging material by the horizontal adhesive portion and each vertical adhesive portion, and the opening can be resealed by inverting and folding back the fold-back portion to the back side opposite the surface of the bag body where the horizontal adhesive portion was formed. The vertical width of the strip-shaped packaging material in the vertical direction is greater than the vertical width of the bag portion between the opening and the horizontal adhesive portion. [Effects of the Invention]

[0011] It is possible to provide a packaging bag that has a simple resealing function. [Brief explanation of the drawings]

[0012] [Figure 1] 1A shows the front surface and FIG. 1B shows the back surface of the packaging bag according to the first embodiment. [Figure 2] 2A and 2B show the front and rear surfaces of the packaging bag of FIG. 1 when the packaging bag is opened at the opening portion. [Figure 3] 3A and 3B show the front and rear views of the packaging bag of FIG. 2 after the opening of the packaging bag has been resealed. [Figure 4] 2A and 2B show the front and back sides of the packaging bag of FIG. 1 when the packaging bag is opened at the opening portion and folded in half lengthwise. [Figure 5] 5A and 5B show the front and rear sides of the packaging bag of FIG. 4 when the opening of the packaging bag is resealed. [Figure 6] 10A shows the front surface and FIG. 10B shows the back surface of a packaging bag according to a second embodiment. [Figure 7] 7A and 7B show the front and rear surfaces of the packaging bag of FIG. 6 when the packaging bag is opened at the opening portion. [Figure 8] 8A and 8B show the front and rear surfaces of the packaging bag of FIG. 7 when the opening of the packaging bag has been resealed. DETAILED DESCRIPTION OF THE INVENTION

[0013] First Embodiment FIG. 1 shows (a) the front surface (forming surface) 1a and (b) the back surface 1b of a packaging bag 1 according to a first embodiment. The packaging bag 1 comprises a bag main body 2 filled with contents (packaged items), a vertical seal portion 4, a pair of horizontal seal portions 6, an opening portion 8, and a resealing portion 10. The bag main body 2 is formed, for example, by molding a film packaging material having a heat-sealable sheet layer into a tubular packaging material. The vertical seal portion 4 is formed on the back surface 1b of the packaging bag 1, i.e., the back surface 1b of the bag main body 2, by sealing the seam of the tubular packaging material along the longitudinal direction Y of the bag main body 2. Each horizontal seal portion 6 is formed by sealing both end portions 2a of the bag main body 2 in the longitudinal direction Y in the transverse direction X.

[0014] The vertical seal 4 and each horizontal seal 6 are formed by sealing the tubular packaging material using a sealing method such as heat sealing. The tear-opening portion 8 is formed on one side of each horizontal seal 6 in the bag body 2 (the upper horizontal seal 6 in the drawing) or in a position adjacent to that horizontal seal 6 in the vertical direction Y, and allows an opening opening 22 (described later) to be formed in the bag body 2 by tearing the bag body 2 in the horizontal direction X.

[0015] The resealable portion 10 is formed from a strip-shaped packaging material 12 separate from the bag body 2, and is provided at a predetermined position in the bag body 2, across from the tear-open portion 8 in the vertical direction Y, of one of the horizontal seal portions 6 (the upper horizontal seal portion 6 in the drawing). The strip-shaped packaging material 12 is formed, for example, from the same film packaging material as the bag body 2. The resealable portion 10 has a horizontal adhesive portion 14, a pair of vertical adhesive portions 16, and a folded-back portion 18.

[0016] The horizontal adhesive portion 14 is formed by adhering the upper end (one end) of the strip packaging material 12 on the side of the opening portion 8 (the upper side of the strip packaging material 12 in the drawing) to the bag body 2 along the horizontal direction X. Each vertical adhesive portion 16 is formed by adhering both end portions 12a of the strip packaging material 12 in the horizontal direction X to the bag body 2 along the vertical direction Y. The strip packaging material 12 has a length substantially the same as the horizontal width W1 of the bag body 2 in the horizontal direction X, and the horizontal adhesive portion 14 is formed across the entire horizontal width W1 of the bag body 2 in the horizontal direction X.

[0017] The vertical adhesive portions 16 are formed at both end portions 2b of the bag body 2 in the horizontal direction X, and are also formed across the entire vertical width W2 in the vertical direction Y of the strip-shaped packaging material 12. As a result, a continuous U-shaped adhesive region is formed in the strip-shaped packaging material 12 by the horizontal adhesive portions 14 and each vertical adhesive portion 16. The horizontal adhesive portions 14 and each vertical adhesive portion 16 are formed by sealing and adhering the strip-shaped packaging material 12 to the surface 1a of the packaging bag 1, i.e., the surface 1a of the bag body 2, using, for example, the same sealing method as the vertical seal portion 4 and each horizontal seal portion 6 described above.

[0018] The fold-back portions 18 are formed on the strip packaging material 12 by the horizontal adhesive portions 14 and each vertical adhesive portion 16. More specifically, the fold-back portions 18 are defined as pocket-like regions in the U-shaped adhesive region formed on the strip packaging material 12, between the back surface of the strip packaging material 12, i.e., the back surface 18a of the fold-back portions 18, and the front surface 1a of the bag body 2, and open toward the other side of each horizontal seal portion 6 (the side of the lower horizontal seal portion 6 in the drawing).

[0019] Figure 2 shows (a) the front surface 1a and (b) the back surface 1b of the packaging bag 1 in Figure 1 when the packaging bag 1 is opened at the tearing portion 8. The tearing portion 8 includes, for example, a slit (not shown) formed in the vertical seal portion 4. By tearing the bag body 2 in the horizontal direction X, for example at the slit in the tearing portion 8, the upper bag portion 20 as seen in Figure 2, including the horizontal seal portion 6 of the bag body 2, is cut and separated from the bag body 2, forming an opening 22 in the bag body 2. Alternatively, a portion of the lower side edge of the horizontal seal portion 6 may be sealed, a slit made in the sealed portion, and the bag may be opened from the slit to form the opening 22.

[0020] Figure 3 shows (a) the front surface 1a and (b) the back surface 1b of the packaging bag 1 when the opening 22 of the packaging bag 1 in Figure 2 has been resealed. After the bag body 2 has been opened, the bag portion 24 between the opening 22 and the lateral adhesive portion 14 is folded back toward the back surface 1b. This seals the bag body 2 at the upper edge of the lateral adhesive portion 14. Furthermore, the folded-back portion 18 is inverted and folded back toward the back surface 1b. As a result, the folded-back bag portion 24 is pressed against the back surface 1b by the inverted pocket-shaped folded-back portion 18.

[0021] That is, the inverted folded portion 18 is placed like a cap on the bag portion 24 including the opening 22, with the back surface 18a of the folded portion 18 exposed to the outside and the front surface 18b of the folded portion 18 coming into close contact with the bag portion 24. As a result, the opening 22 is closed and resealed by the resealing portion 10. Note that if the vertical width W3 of the bag portion 24 is short, the bag portion 24 cannot be folded back to the back surface 1b, and there is a risk that the contents will not fit into the bag body 2 and may spill out. Therefore, the vertical width W3 needs to be wide enough to allow the bag portion 24 to be folded back.

[0022] 4 shows (a) the front surface 1a and (b) the back surface of the packaging bag 1 when the packaging bag 1 in FIG. 1 is opened at the tearing portion 8 and folded in half in the vertical direction Y. As in the case shown in FIG. 2, by tearing the bag body 2 in the horizontal direction X, for example at the slit in the tearing portion 8, the upper bag portion 20 as seen in FIG. 4, including the horizontal seal portion 6 of the bag body 2, is cut and separated from the bag body 2, and an opening 22 is formed in the bag body 2.

[0023] After more than half of the contents filled in the bag body 2 has been removed from the opening 22, the bag body 2 is folded in half at the center in the vertical direction X, with the back surfaces 1b overlapping. Specifically, the lower part of the bag body 2 from the center shown in Figure 4(a) is folded in half toward the back of the drawing, with the back surfaces 1b overlapping. As a result, the front surface 1a appears in Figure 4(b).

[0024] As a result, a fold line 26 is formed at the folded portion of the bag body 2, and the remaining contents filled in the bag body 2 are partitioned by the fold line 26 inside the bag body 2. In addition, the other of each horizontal seal portion 6 (the horizontal seal portion 6 located on the lower side in Figures 3(a) and (b)), i.e., the lower edge of the horizontal seal portion 6 located on the lower side, is overlapped with the opening opening 22. In addition, the bag portion 24 is overlapped with the horizontal seal portion 6 located on the lower side.

[0025] Figure 5 shows (a) the front surface 1a and (b) the back surface of the packaging bag 1 when the opening 22 of the packaging bag 1 in Figure 4 has been resealed. After the bag main body 2 has been opened and folded in half, the overlapping bag portion 24 and horizontal seal portion 6 are folded back to the back surface (the side shown in Figure 5(b)). This seals the bag main body 2 at the upper edge of the horizontal adhesive portion 14. Furthermore, the folded-back portion 18 is inverted and folded back to the back surface (the side shown in Figure 5(b)). As a result, the folded-back bag portion 24 and horizontal seal portion 6 are pressed against the back surface by the inverted pocket-shaped folded-back portion 18.

[0026] That is, the inverted folded portion 18 is placed like a cap over the bag portion 24 including the opening 22 and the horizontal seal portion 6 overlapping the bag portion 24, with the back surface 18a of the folded portion 18 exposed to the outside and the front surface 18b of the folded portion 18 coming into close contact with the bag portion 24. As a result, the opening 22 is closed and resealed by the resealing portion 10. Furthermore, by folding the bag body 2 in half, a fold line 26 is formed, and the contents of the bag body 2 are partitioned at the fold line 26. Therefore, the bag body 2 is compact and does not take up much storage space. The vertical width W3 needs to be wide enough to allow the bag portion 24 to be folded back.

[0027] As described above, the packaging bag 1 according to the first embodiment has a resealable portion 10 formed from a strip-shaped packaging material 12 separate from the bag main body 2. The resealable portion 10 is provided at a predetermined position on the bag main body 2, separated from the tear-open portion 8 in the longitudinal direction Y of one of the horizontal seal portions 6. The resealable portion 10 has a horizontal adhesive portion 14, each vertical adhesive portion 16, and a folded-back portion 18. The opening opening 22 is resealed by inverting and folding back the folded-back portion 18 to the back surface 1b of the bag main body 2, which is opposite to the front surface 1a on which the horizontal adhesive portion 14 is formed. This eliminates the need to fold back the upper corners of the bag main body 2 diagonally, thereby reducing the effort required for resealing and eliminating the empty space in the bag main body 2 that would otherwise be created by folding back the upper corners of the bag main body 2 diagonally. Therefore, a packaging bag 1 with a simple resealing function can be provided.

[0028] Furthermore, the strip-shaped packaging material 12 has a length that is substantially the same as the width W1 in the width direction X of the bag body 2, the horizontal adhesive portions 14 are formed across the entire width W1 in the width direction X of the bag body 2, and the vertical adhesive portions 16 are formed at both end portions 2b in the width direction X of the surface 1a of the bag body 2. As a result, the resealable portions 10 are formed only on the surface 1a of the packaging bag 1, which further simplifies the configuration of the packaging bag 1 and the packaging machine that produces the packaging bag 1.

[0029] Furthermore, each vertical adhesive portion 16 is formed across the entire vertical width W2 in the vertical direction X of the strip-shaped packaging material 12. As a result, a continuous U-shaped adhesive region is formed in the strip-shaped packaging material 12 by the horizontal adhesive portions 14 and each vertical adhesive portion 16. Therefore, when the pocket-shaped folded portion 18 is turned inside out and placed over the opening 22 formed in the bag body 2 in a cap-like shape, it is possible to prevent the contents from spilling out of the packaging bag 1.

[0030] Second Embodiment 6 shows (a) the front surface 1a and (b) the back surface 1b of a packaging bag 1 according to a second embodiment. Note that the same components as those in the first embodiment may be denoted by the same reference numerals in the drawings, and descriptions thereof may be omitted. The strip-shaped packaging material 12 of this embodiment has a length greater than the width W1 of the bag body 2 in the lateral direction X, and both end portions 12a of the strip-shaped packaging material 12 are folded toward the back surface 1b.

[0031] The horizontal adhesive portions 14 are formed on the front surface 1a of the packaging bag 1 across the entire width W1 of the bag body 2, while the vertical adhesive portions 16 are formed on the back surface 1b of the bag body 2. As a result, the strip-shaped packaging material 12 of this embodiment has non-adhesive portions 28 that are not adhered to the bag body 2, extending from the front surface 1a to the back surface 1b of the bag body 2. Furthermore, as in the first embodiment, the vertical adhesive portions 16 are formed across the entire vertical width W2 in the vertical direction Y of the strip-shaped packaging material 12.

[0032] 7 shows (a) the front surface 1a and (b) the back surface 1b of the packaging bag 1 when the packaging bag 1 in Fig. 6 is opened at the tearing portion 8. As in the first embodiment, by tearing the bag body 2 in the lateral direction X at the tearing portion 8, the bag portion 20 at the upper end as seen in Fig. 7, including the lateral seal portion 6 of the bag body 2, is cut and separated from the bag body 2, and an opening 22 is formed in the bag body 2.

[0033] Figure 8 shows (a) the front surface 1a and (b) the back surface 1b of the packaging bag 1 when the opening 22 of the packaging bag 1 in Figure 7 has been resealed. After opening the bag body 2, as in the first embodiment, the bag portion 24 is folded back toward the back surface 1b, and the folded-back portion 18 is inverted and folded back toward the back surface 1b. As a result, the pocket-shaped folded-back portion 18 is turned inside out and placed inside out on the bag portion 24 including the opening 22 in a cap-like manner, and the opening 22 is closed and resealed by the resealing portion 10.

[0034] As described above, the packaging bag 1 according to the second embodiment, like the first embodiment, has a resealable portion 10 formed from a film-like strip packaging material 12 separate from the bag body 2, and the resealable portion 10 has horizontal adhesive portions 14, vertical adhesive portions 16, and a folded-back portion 18, and the opening opening 22 is resealed by inverting and folding back the folded-back portion 18 toward the back surface 1b. This makes it possible to provide a packaging bag 1 with a simple resealing function, like the first embodiment.

[0035] Furthermore, each vertical adhesive portion 16 is formed across the entire vertical width W2 in the vertical direction X of the strip-shaped packaging material 12. This allows each vertical adhesive portion 16 to be firmly adhered across the entire vertical width W2. Therefore, when resealing a packaging bag 1 containing a large amount of contents, even if the strip-shaped packaging material 12 is pulled at the non-adhesive portion 28, peeling of each vertical adhesive portion 16 is effectively prevented, and the resealing function of the packaging bag 1 can be reliably achieved.

[0036] This concludes the description of the embodiment, but the present invention is not limited to the above embodiment and various modifications can be made without departing from the spirit of the present invention. For example, if the fold-back portion 18 is formed in the strip-shaped packaging material 12 by the horizontal adhesive portions 14 and each vertical adhesive portion 16, the horizontal adhesive portions 14 do not necessarily have to be formed across the entire width W1 of the bag body 2 but may be formed partially, and their shape is not limited to being linear.

[0037] Furthermore, the vertical adhesive portions 16 do not necessarily have to be formed across the entire vertical width W1 of the strip-shaped packaging material 12, but may be formed partially, and their shape is not limited to a straight line. Furthermore, in the first embodiment, the horizontal adhesive portions 14 and the vertical adhesive portions 16 are formed on the front surface 1a of the packaging bag 1, and the strip-shaped packaging material 12 is adhered only to the front surface 1a of the packaging bag 1, but the horizontal adhesive portions 14 and the vertical adhesive portions 16 may be formed on the back surface 1b of the packaging bag 1, and the strip-shaped packaging material 12 may be adhered to the back surface 1b of the packaging bag 1.

[0038] In the second embodiment, the horizontal adhesive parts 14 are formed on the front surface 1a of the packaging bag 1, while the vertical adhesive parts 16 are formed on the back surface 1b of the packaging bag 1. However, the horizontal adhesive parts 14 may be formed on the back surface 1b of the packaging bag 1, and the vertical adhesive parts 16 may be formed on the front surface 1a of the packaging bag 1. In addition, the packaging material used for the bag body 2 and the strip-shaped packaging material 12 is not limited to a film packaging material, and may be a hard-to-stretch packaging material such as a paper packaging material, as long as it has a sealing layer.

[0039] Furthermore, the form of the packaging bag 1 described in each embodiment is a pillow bag with a seam, but is not strictly limited to the above as long as the resealable portion of the embodiment is formed. Specifically, the packaging bag 1 may be an envelope-sealed pillow bag, a three-side sealed bag, a four-side sealed bag, etc. [Explanation of symbols]

[0040] 1 packaging bag 1a Surface (formation surface) 1b back side 2 bags 2a End of the bag body in the longitudinal direction 2b Both ends in the horizontal direction of the surface (forming surface) of the bag body 6 Horizontal seal part 8 Opening part 10 Re-sealing section 12. Packaging strips 12a Both ends of the strip packaging material in the horizontal direction 14 Lateral adhesive part 16 Vertical adhesive section 18 Folded section 22 Opening mouth W1 Width of the bag body in the horizontal direction W2: The vertical width of the strip packaging material X horizontal direction Y vertical direction

Claims

1. a bag body formed by molding a packaging material into a tubular packaging material; a horizontal seal portion formed by sealing the longitudinal end of the bag body in the horizontal direction; a tearing portion formed in the bag body at a position adjacent to the horizontal seal portion in the vertical direction, the tearing portion enabling an opening to be formed in the bag body by tearing the bag body in the horizontal direction; a resealing portion formed from a strip-shaped packaging material separate from the bag body and provided at a predetermined position on the bag body, separated from the opening portion in the longitudinal direction of the horizontal seal portion; Equipped with The resealing portion is a horizontally bonded portion formed by bonding one end of the strip-shaped packaging material on the side of the opening portion to the bag body along the horizontal direction; a pair of vertical adhesive portions formed by adhesively bonding both end portions in the horizontal direction of the strip-shaped packaging material to the bag body along the vertical direction; a folded portion formed on the strip-shaped packaging material by the horizontal adhesive portion and each of the vertical adhesive portions; and The opening is resealed by inverting and folding the folded-back portion to the back side opposite to the forming surface of the bag body on which the horizontal adhesive portion is formed, A packaging bag, wherein the width of the strip-shaped packaging material in the vertical direction is greater than the width of a portion of the bag between the opening and the horizontal adhesive portion in the vertical direction.

2. the strip-shaped packaging material has a length substantially equal to the width of the bag body in the lateral direction, The horizontal adhesive portion is formed across the entire width of the bag body, The packaging bag according to claim 1 , wherein the vertical adhesive portions are formed at both ends in the lateral direction of the forming surface of the bag body.

3. the strip-shaped packaging material has a length greater than the width of the bag body in the lateral direction, and both ends of the strip-shaped packaging material in the lateral direction are folded toward the back surface, The horizontal adhesive portion is formed across the entire width of the bag body, The packaging bag according to claim 1 , wherein each of the vertical adhesive portions is formed on the back surface of the bag body.

4. The packaging bag according to claim 1 , wherein each of the vertical adhesive portions is formed across the entire vertical width of the strip-shaped packaging material in the vertical direction.

Images