Packaging bag, and method for extracting content from packaging bag

Abstract

To provide a packaging bag which enables easy formation of a wide opening.SOLUTION: A packaging bag includes a cylindrical body which is configured so that a vertical seal part is formed in films, an upper side lateral seal part, a lower side lateral seal part, and first and second tear start parts, wherein the vertical seal part is formed by welding the films in a butt part formed by curving the films into cylindrical shapes and stacking an inner surface on one edge side of the film and an inner surface on the other edge side thereof, the upper side lateral seal part is provided so as to block an upper side of the cylindrical body, the lower side lateral seal part is provided so as to block a lower side of the cylindrical body, the packaging bag is composed of the butt part and a body part other than the butt part, the first tear start part is provided on the butt part, the second tear start part is provided on the upper side lateral seal part, and when a length in a vertical direction of the packaging bag is represented by L, and a length in the vertical direction between an inner edge of the upper side lateral seal part and the first tear start part is represented by L1, L1 / L is 0 to 0.2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging bag and a method for removing contents from the packaging bag. [Background technology]

[0002] Patent Document 1 discloses a packaging bag in which tearing starts at a tear initiation part provided on the seam part, and after the tearing reaches the main body part, the tearing spreads diagonally on both sides of the seam part and continues to tear in the longitudinal direction of the vertical seal part. In such a packaging bag, a wide opening can be formed by tearing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-156808 Summary of the Invention [Problem to be solved by the invention]

[0004] The packaging bag of Patent Document 1 has the advantage that a wide opening can be easily formed, but the size of the opening may not allow the contents to be removed smoothly, so a packaging bag that makes it easier to form a wider opening is desired.

[0005] The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a packaging bag in which a wide opening can be easily formed. [Means for solving the problem]

[0006] According to the present invention, the following inventions are provided. [1] A method for a packaging bag, the packaging bag comprising a cylindrical body formed by forming a vertical seal portion in a film, an upper horizontal seal portion, a lower horizontal seal portion, and first and second tear initiation portions, the vertical seal portion being formed by bending the film into a cylindrical shape and overlapping the inner surface of one edge side and the inner surface of the other edge side of the film to weld the films together at a seam portion formed by folding the film into a cylindrical shape and overlapping the inner surface of one edge side and the inner surface of the other edge side of the film, the upper horizontal seal portion being provided to close the upper side of the cylindrical body, the lower horizontal seal portion being provided to close the lower side of the cylindrical body, the packaging bag being composed of the seam portion and a main body portion other than the seam portion, the first tear initiation portion being provided in the seam portion and the second tear initiation portion being provided in the upper horizontal seal portion, the vertical length of the packaging bag being L and the vertical length from the inner edge of the upper horizontal seal portion to the first tear initiation portion being L1, L1 / L is 0 to 0.2. [2] The packaging bag according to [1], wherein, when the left-right length of the upper horizontal seal portion is Ws and the left-right length from one left-right end of the upper horizontal seal portion to the second tear initiation portion is W1, W1 / Ws is 0.2 to 0.8. [3] A method for removing contents from a packaging bag, the packaging bag comprising a cylindrical body formed by forming a vertical seal portion on a film, an upper horizontal seal portion, and a lower horizontal seal portion, the vertical seal portion being formed by bending the film into a cylindrical shape and overlapping an inner surface of one edge side of the film with an inner surface of the other edge side of the film to form a seam portion, the upper horizontal seal portion being arranged to close an upper side of the cylindrical body, the lower horizontal seal portion being arranged to close a lower side of the cylindrical body, the packaging bag comprising the seam portion and other portions. the method comprises a main body portion, and the method includes a first tearing step and a second tearing step, in which in the first tearing step, an opening is formed by tearing the main body portion from a first tearing start position at the seam portion toward the lower horizontal seal portion, and in the second tearing step, the main body portion is teared from a second tearing start position at the upper horizontal seal portion toward the lower horizontal seal portion so as to enlarge the opening, wherein L is the vertical length of the packaging bag and L1 is the vertical length from an inner edge of the upper horizontal seal portion to the first tearing start position, and L1 / L is 0 to 0.2. [4] The method described in [3], wherein when the left-right length of the upper horizontal seal portion is Ws and the left-right length from one left-right end of the upper horizontal seal portion to the second tear start position is W1, W1 / Ws is 0.2 to 0.8. [5] The method according to [3] or [4], wherein in the first tearing step, the opening is formed by pulling a portion of the seam portion that is closer to the lower horizontal seal portion than the first tearing start position toward one end of the upper horizontal seal portion in the left-right direction. Effect of the Invention

[0007] In the packaging bag of the present invention, the main body of the packaging bag can be torn starting from a first tear initiation point to form an opening, and the main body can be torn starting from a second tear initiation point to enlarge the opening, making it possible to easily form an opening that is wider than that of Patent Document 1. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of the packaging bag 1 with no contents inside. [Diagram 2] FIG. 1 is a perspective view of a packaging bag 1 with contents inside. [Diagram 3] Figure 3A is a cross-sectional view perpendicular to the longitudinal direction D1 at the center of the longitudinal direction D1 of the vertical seal portion 7 when the contents are filled in the packaging bag 1, and Figure 3B is an enlarged view of area B in Figure 3A. [Figure 4] FIG. 2 is a plan view of the packaging bag 1 with the contents inside. [Diagram 5] 6 is a plan view showing a state after the opening 1b is formed by a first tearing step from the state in FIG. 5. Note that the film peeled off in the first tearing step is not shown. [Figure 6] 6 is a cross-sectional view corresponding to the section AA in FIG. 5, illustrating a state during a second tearing step from the state in FIG. 5. FIG. [Figure 7]6 is a cross-sectional view showing a state after a second tearing step has been carried out from the state in Fig. 5. Note that the film peeled off in the second tearing step is omitted in the illustration. [Figure 8] FIG. 1 is a configuration diagram of a bag making and filling machine 100. [Figure 9] 1 is an enlarged view of the vicinity of a transverse sealing machine 116 of a bag making and filling machine 100, showing a state in which a transverse seal portion 11 is being formed by the transverse sealing machine 116. FIG. [Figure 10] From the state in Figure 9, the horizontal sealing machine 116 opens, the shutter member 123 returns to its initial position, the horizontal sealing section 11 moves to the position of the press / cutter 118, the press / cutter 118 clamps the horizontal sealing section 11 and cuts it, and then the press / cutter 118 and the squeezing roll 115 open. [Figure 11] 10, the squeeze roll 115 is closed after the contents W are further added, and then the contact portion 3a moves to the position of the shutter member 123. FIG. [Figure 12] 11, the shutter member 123 sandwiches the contact portion 3a and moves downward vertically in this state. [Figure 13] 1 and shows a state in which the second tear initiation portion 62 is located to the right of the boundary line 8e between the joint portion 8 and the main body portion 9. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Also, each feature can be an invention independently.

[0010] 1. Packaging bag 1 As shown in Figures 1 to 3, a packaging bag 1 according to one embodiment of the present invention comprises a cylinder 3 formed by forming a vertical seal portion 7 on a film 2, an upper horizontal seal portion 4, a lower horizontal seal portion 5, and first and second tear initiation portions 61, 62. The packaging bag 1 is usually filled with contents, but for convenience, Figure 1 shows the packaging bag 1 in a state where no contents are filled. Examples of contents include viscous foods such as flower paste, jam, and bean paste.

[0011] In the following description, the top, bottom, left and right of Fig. 1 refer to the top, bottom, left and right of the packaging bag 1. Specifically, the axial direction of the cylinder 3 corresponds to the top and bottom direction. The left and right sides of the packaging bag 1 correspond to the left and right sides when the vertical seal portion 7 is disposed at the front side. The surface on the vertical seal portion 7 side is referred to as the front side, and the opposing surface is referred to as the back side. The top and bottom direction corresponds to the longitudinal direction D1 of the vertical seal portion 7, and the left and right direction corresponds to the orthogonal direction D2 perpendicular to the longitudinal direction D1.

[0012] The length of the packaging bag 1 in the left-right direction is, for example, 140 to 300 mm, and preferably 160 to 260 mm. Specifically, this length may be, for example, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, or 300 mm, and may be within a range between any two of the numerical values ​​exemplified here. If this value is too small, the contents may adhere to the inner surface of the packaging bag 1 during bag making and filling, making it difficult to fill. This problem is prominent when the contents have high viscosity. The value of [vertical length of packaging bag 1 / left-right length of packaging bag 1] is, for example, 1.5 to 15, and preferably 2 to 10. Specifically, this value may be, for example, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, or 15, and may be within a range between any two of the values ​​exemplified here.

[0013] As shown in Fig. 3, the vertical seal 7 is formed by bending the film 2 into a cylindrical shape and welding the film 2 together at a seam 8 formed by overlapping the inner surface of one edge 2a of the film 2 with the inner surface of the other edge 2b. The vertical seal 7 may be formed over the entire seam 8, or an unsealed portion 8a may be provided in part of the seam 8. It is preferable that the unsealed portion 8a is provided so as to include the edge 8b of the seam 8. The portion of the packaging bag 1 other than the seam 8 is the main body 9. The main body 9 is bag-shaped.

[0014] It is preferable that the palm portion 8 is in a laid-down state. The surface of the palm portion 8 facing the main body portion 9 may or may not be welded to the outer surface of the main body portion 9.

[0015] The length in the left-right direction of each of the joint portion 8 and the vertical seal portion 7 is, for example, 5 to 50 mm, and preferably 10 to 30 mm. Specifically, this length is, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, and may be within a range between any two of the numerical values ​​exemplified here. The value of {left-right length of the vertical seal portion 7 / left-right length of the joint portion 8} is, for example, 0.2 to 1.0, and preferably 0.5 to 1.0. Specifically, this value is, for example, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0016] The upper horizontal seal portion 4 and the lower horizontal seal portion 5 are provided so as to close the upper and lower sides, respectively, of the cylindrical body 3. The horizontal seal portions 4, 5 are preferably formed along the upper and lower ends, respectively, of the cylindrical body 3. The horizontal seal portions 4, 5 are preferably formed so as to be perpendicular to the vertical seal portion 7. The horizontal seal portions 4, 5 can each be formed by heat-sealing the cylindrical body 3.

[0017] In one example, the horizontal seal portions 4, 5 are composed of a plurality of linear seal portions 4a, 5a (areas indicated by dotted lines in FIG. 1) aligned in the vertical direction. Each linear seal portion 4a, 5a is provided so as to extend in the left-right direction of the horizontal seal portions 4, 5. The linear seal portions 4a, 5a are preferably arranged in parallel. The linear seal portions 4a, 5a are preferably provided at a pitch of 2 to 5 mm. Specifically, this pitch is, for example, 2, 2.5, 3, 3.5, 4, 4.5, or 5 mm, and may be within a range between any two of the numerical values ​​exemplified here.

[0018] The first tear initiation portion 61 is provided in the joint portion 8. The first tear initiation portion 61 is a portion configured to facilitate tearing of the joint portion 8, and is configured by, for example, a notch or a cut. The first tear initiation portion 61 is preferably provided so as to reach the vertical seal portion 7 from the edge 8b of the joint portion 8. {The left-right length of the first tear initiation portion 61 / the left-right length of the joint portion 8} is, for example, 0.1 to 0.9, and preferably 0.3 to 0.7. This value is specifically, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, and may be within a range between any two of the numerical values ​​exemplified here.

[0019] If the vertical length of the packaging bag 1 is L and the vertical length from the inner edge 4b ​​of the upper horizontal seal portion 4 to the first tear initiation portion 61 is L1, then L1 / L is preferably 0 to 0.2. L1 is, for example, 0 to 50 mm, and preferably 1 to 30 mm. If this value is too large, the vertical length of the opening 1b formed with the first tear initiation portion 61 as the starting point in the first tearing step described below becomes too short, making it difficult to remove the contents. Specifically, L1 / L is, for example, 0, 0.001, 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0, or may be in the range between any two of the numerical values ​​exemplified here. Specifically, L1 may be, for example, 0, 1, 2, 3, 4, 5, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, or may be in a range between any two of the numerical values ​​exemplified here.

[0020] The first tear initiation portion 61 may be additionally provided at a position adjacent to the lower horizontal seal portion 5. If the distance from the inner edge of the lower horizontal seal portion 5 to the first tear initiation portion 61 provided at a position adjacent to the lower horizontal seal portion 5 is L2, the above description of L1 can also be applied mutatis mutandis to L2. Providing multiple first tear initiation portions 61 has the advantage that it is possible to try again if opening fails and to select a first tear initiation portion 61 that is easy to use depending on the dominant hand.

[0021] The second tear initiation portion 62 is provided in the upper horizontal seal portion 4. The second tear initiation portion 62 is a portion configured to facilitate tearing of the upper horizontal seal portion 4, and is formed, for example, by a notch or cut. If the left-right length of the upper horizontal seal portion 4 is Ws and the left-right length from one left-right end 4c of the upper horizontal seal portion 4 to the second tear initiation portion 62 is W1, W1 / Ws is preferably 0.2 to 0.8, and more preferably 0.3 to 0.6. Providing the second tear initiation portion 62 at a position close to the left-right center of the packaging bag 1 in this manner makes it easier to widen the opening 1b in the first tearing step described below. Specifically, W1 / Ws may be, for example, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, or 0.80, or may be in a range between any two of the numerical values ​​exemplified here.

[0022] The second tear initiation portion 62 may be provided at a position that does not overlap with the folded-over joint portion 8 as shown in Fig. 1. In other words, it may be provided to the left of the edge 8b of the joint portion 8, or to the right of the boundary line 8e between the joint portion 8 and the main body portion 9 as shown in Fig. 13. Providing the second tear initiation portion 62 at such a position has the advantage that the joint portion 8 is less likely to get in the way when forming the second tear initiation portion 62. Also, by providing the second tear initiation portion 62 to the right of the boundary line 8e, the second tear initiation portion 62 can be located near the center in the left-right direction of the packaging bag 1 without overlapping with the joint portion 8.

[0023] The distance between the leading ends of the first tear initiation portion 61 and the second tear initiation portion 62 is preferably 50 mm or less. In this case, the opening 1b is easily enlarged in the second tearing step described below. This distance is, for example, 10 to 50 mm, specifically, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, and may be in the range between any two of the numerical values ​​exemplified here.

[0024] The second tear initiation portion 62 may be provided on both sides of the boundary line 8e between the joint portion 8 and the main body portion 9, or may be additionally provided in the lower horizontal seal portion 5. Providing multiple second tear initiation portions 62 has the advantage that it is possible to try again if an opening fails, and that the second tear initiation portion 62 that is most convenient to use can be selected depending on the dominant hand.

[0025] In areas of the packaging bag 1 near the horizontal seal portions 4, 5, the packaging bag 1 is less likely to expand, causing the packaging bag 1 to assume a flat shape, which hinders rolling transport of the packaging bag 1. This tendency is particularly noticeable when the inner edges of the horizontal seal portions 4, 5 are not provided with curved portions that convex outward at both ends, or when curved portions are provided but their length in the left-right direction is short.

[0026] In this embodiment, the left curved portions 4l, 5l and the right curved portions 4r, 5r are provided at both ends of the inner edge of the horizontal seal portions 4, 5, which are convex toward the outside. In addition, if the horizontal seal portions 4, 5 have a left-right length Ws and the left-right lengths of the left curved portions 4l, 5l and the right curved portions 4r, 5r Wl, Wr, Wr / Ws and Wl / Ws are set to 0.1 to 0.4, respectively. By forming such curved portions, as shown in FIG. 2, the packaging bag 1 is easily expanded even in the vicinity of the horizontal seal portions 4, 5, and the outer shape becomes approximately cylindrical, so that the rolling and conveying of the packaging bag 1 becomes smooth. It is preferable that Wr and Wl are the same, but they may be different from each other. Specifically, Wr / Ws and Wl / Ws are, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, and 0.4, and may be within a range between any two of the numerical values ​​exemplified here. Ws is the same as the length of the packaging bag 1 in the left-right direction. Wl and Wr are, for example, 10 to 100 mm, and preferably 20 to 50 mm. Specifically, Wl and Wr are, for example, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 mm, and may be within a range between any two of the numerical values ​​exemplified here.

[0027] In addition, the left curved portion 4l, 5l and the right curved portion 4r, 5r are preferably arc-shaped, and when the radii of curvature are Rl, Rr, Rl / Ws and Rr / Ws are preferably 0.1 to 0.4. Specifically, Rl / Ws and Rr / Ws are, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, and may be within a range between any two of the numerical values ​​exemplified here. Rl, Rr are, for example, 20 to 60 mm, and preferably 30 to 50 mm. Specifically, Rl, Rr are, for example, 20, 25, 30, 35, 40, 45, 50, 55, 60 mm, and may be within a range between any two of the numerical values ​​exemplified here.

[0028] The packaging bag 1 filled with the contents is in a substantially elliptical cylindrical shape. As shown in Fig. 3, the circularity of the cross section perpendicular to the longitudinal direction D1 at the center of the longitudinal direction D1 of the vertical seal portion 7 when the contents are filled in the packaging bag 1 is preferably 0.5 or more. The larger the circularity value, the closer the cross-sectional shape is to a circle. In this specification, the circularity is defined as D1 / D2, where D1 and D2 are the inscribed circle diameter and the circumscribed circle diameter in the cross section, respectively. D1 / D2 is, for example, 0.5 to 1.0, specifically, for example, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0029] The film 2 is preferably a laminated film having a base layer and a sealant layer, and more preferably has an adhesive layer between the base layer and the sealant layer.

[0030] The base material layer is disposed so as to be exposed on the outer surface of the packaging bag 1, and the sealant layer is disposed so as to be exposed on the inner surface of the packaging bag 1. The sealant layers are heat-sealed to each other to form the vertical seal portion 7 and the horizontal seal portions 4 and 5.

[0031] The base layer is made of a material having excellent strength and high impact resistance. For example, polyamide, polyolefin, polyethylene, etc. are used as the base layer. The adhesive layer is a layer for adhering the base layer and the sealant layer so as to be laminated together, and for example, polyethylene, etc. are used as the adhesive layer.

[0032] The polyamide of the base layer preferably contains an aromatic polyamide. In this case, the base layer has linear cutting properties in the MD direction and has excellent barrier properties. There are no particular limitations on the aromatic polyamide, but resins containing 70 mol % or more of polyamide structural units consisting of xylylenediamine and α,ω-aliphatic dicarboxylic acid having 6 to 12 carbon atoms in the molecular chain can be used. Specific examples include homopolymers such as polymetaxylylene adipamide, polymetaxylylene pimelamide, polymetaxylylene azelamide, polyparaxylylene azelamide, and polyparaxylylene decanamide, and copolymers such as metaxylylene / paraxylylene adipamide copolymer, metaxylylene / paraxylylene pimelamide copolymer, metaxylylene / paraxylylene azelamide copolymer, and metaxylylene / paraxylylene sepacamide copolymer, with polymetaxylylene adipamide (hereinafter referred to as "MXD6") being preferred as it has excellent basic properties such as strength and gas barrier properties, and is relatively easily available industrially.

[0033] The sealant layer can be formed of a resin having excellent heat sealability. For example, the sealant layer can be formed of linear low-density polyethylene. The film constituting the sealant layer is preferably one having linear cutability in the MD direction.

[0034] In addition, it is preferable that at least one of the base layer and the sealant layer has a straight-line cutting property. The thickness of the sealant layer is preferably at least twice the thickness of the base layer, and is preferably at least half the thickness of the entire film 2.

[0035] The film 2 can be formed by laminating a base layer having a thickness of 10 μm to 20 μm, for example 15 μm, an adhesive layer having a thickness of 10 μm to 30 μm, for example 20 μm, and a sealant layer having a thickness of 30 μm to 50 μm, for example 40 μm, and the film 2 usually has a thickness of 50 μm to 100 μm.

[0036] The base layer and the sealant layer are bonded together by an adhesive layer so as to be laminated together. For example, polyethylene can be used as the adhesive layer, and the base layer and the sealant layer can be bonded together by an extrusion lamination method. A material other than polyethylene can be used as the adhesive layer, and the base layer and the sealant layer can be bonded together by a dry lamination method. Alternatively, fusion without an adhesive layer can be used. The film 2 formed from the base layer, the adhesive layer, and the sealant layer in this way has high strength, impact resistance, sealing properties, airtightness, etc.

[0037] The film 2 has a first tear strength S1, which is the tear strength in the longitudinal direction D1, and a second tear strength S2, which is the tear strength in the orthogonal direction D2. The S2 / S1 ratio is preferably 1.5 to 10, and more preferably 2 to 6. The tear strength can be measured according to JIS K7128. The tear strength is an index indicating the magnitude of the force required to tear the film 2, and the larger the tear strength value, the more difficult the film 2 is to tear. S2 / S1 is an index indicating how difficult it is to tear in the orthogonal direction D2 compared to the longitudinal direction D1, and the larger this value, the more easily the film 2 is to tear in the longitudinal direction D1. The value of S2 / S1 affects how the film 2 is torn when tearing of the film 2 is started from the first tear initiation portion 61, and when S2 / S1 is within the above numerical range, the wide opening 1b is likely to be formed so as to extend over a wide range in the longitudinal direction D1. Specifically, S2 / S1 may be, for example, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, or 10.0, and may be within a range between any two of the numerical values ​​exemplified here.

[0038] 2. Method of removing contents from packaging bag 1 A method for removing contents from a packaging bag 1 according to one embodiment of the present invention will be described with reference to Figs. 1 to 7. This method includes a first tearing step and a second tearing step. Each step will be described in detail below. In the following description, the first and second tearing start positions 61a and 62a are positions where tearing starts, respectively, and in the following description, the first and second tearing start portions 61 and 62 are the first and second tearing start positions 61a and 62a, respectively. However, the packaging bag 1 used in this removal method does not necessarily have to include the first and second tearing start portions 61 and 62, and for example, a cut may be formed using a tool such as scissors, and the position may be the first tearing start position 61a or the second tearing start position 62a. The description of the first and second tearing start portions 61 and 62 also applies to the first and second tearing start positions 61a and 62a, unless it is contrary to the spirit of the description.

[0039] <First tearing process> In the first tearing step, as shown in Figs. 4 and 5, the main body portion 9 is torn from a first tearing start position 61a at the joint portion 8 toward the lower horizontal seal portion 5 to form the opening 1b.

[0040] In the first tearing step, it is preferable to form the opening 1b by pulling a portion 8d of the joint portion 8, which is closer to the lower horizontal seal portion 5 than the first tearing start position 61a, toward one end 4c in the left-right direction of the upper horizontal seal portion 4. As a result, the main body portion 9 is torn biased toward one end 4c of the upper horizontal seal portion 4 as shown by dashed dotted lines 13 and 14 in Fig. 4, and an opening 1b is formed in a shape biased toward one end 4c of the upper horizontal seal portion 4 as shown in Fig. 5. The opening 1b is formed in an intermediate region 15 between the dashed dotted lines 13 and 14. The opening 1b formed biased toward one end 4c has the advantage that it is easy to enlarge in the second tearing step.

[0041] In one example, the first tearing step is performed by pinching the areas 8c and 8d of the joint portion 8 on both sides of the first tear start position 61a with both hands, and pulling the area 8d on the lower horizontal seal portion 5 side toward the one end 4c of the upper horizontal seal portion 4 while pulling it toward the lower horizontal seal portion 5, causing the tearing to proceed as shown by the dashed lines 13 and 14. Preferably, the dashed line 13 is a boundary line 8e between the joint portion 8 and the main body portion 9, and a fold is provided on the boundary line 8e, so that the main body portion 9 is easily torn along the boundary line 8e. The dashed line 14 proceeds obliquely from the boundary line 8e toward the one end 4c, and then proceeds in a direction substantially parallel to the longitudinal direction D1 of the vertical seal portion 7.

[0042] <Second tearing process> In the second tearing step, as shown in Figures 5 and 6, the main body 9 is torn so as to enlarge the opening 1b from the second tear initiation position 62a at the upper horizontal seal portion 4 toward the lower horizontal seal portion 5. This forms an enlarged opening 1b as shown in Figure 7, making it even easier to remove the contents W.

[0043] In one example, the second tearing step can be performed by pinching the regions 4d, 4e on both sides of the second tearing start position 62a of the upper horizontal seal portion 4 with both hands, holding the region 4d on one end 4c of the upper horizontal seal portion 4, and pulling up the region 4e on the other end 4f. As a result, the tearing that started at the second tearing start position 62a reaches the opening 1b along the dashed line 17, and the main body portion 9 is divided along the dashed line 16, and the front region 9b is peeled off from the contents W with the back region 9a located below the contents W as shown in Fig. 6. As a result, the opening 1b is enlarged as shown in Fig. 7, making it easier to remove the contents W.

[0044] It is preferable that the tearing in the first and second tearing steps is stopped at the inner edge of the lower horizontal seal portion 5. In this case, the portions of the packaging bag 1 that have been peeled off in the first and second tearing steps and the remaining portions remain connected at the lower horizontal seal portion 5, which improves the handleability of the packaging bag 1 when processing it after the contents W have been removed.

[0045] 3. Bag-making and filling method Next, with reference to FIGS. 8 to 12, a bag-making and filling method using the film 2 will be described. This method can be implemented using a vertical bag-making and filling machine 100.

[0046] <S1: Film bending step> First, the film 2 unwound from the roll-shaped original fabric F is guided to the former 112 through a plurality of unwinding rolls 120 and 121. A sensor 119 is arranged in the path from the roll-shaped original fabric F to the former 112, which detects the registration marks printed on the film 2 at regular intervals in the length direction, so that a film 2 of a certain length can be sent out on the track of the bag-making and filling machine 100 at regular time intervals. The film 2 is curved into a cylindrical shape while passing through the former 112, and the inner surfaces of one edge 2a side and the other edge 2b side of the film 2 are overlapped to form the clasp part 8.

[0047] Note that, a printing step of printing on the film 2 may be provided at a position in front of the former 112. This printing is preferably performed in a region that will be the front surface (the surface on the side of the longitudinal seal part 7) of the packaging bag 1. In this case, when transporting the packaging bag 1 that has fallen onto the conveyor 130 in the cutting step described later with the longitudinal seal part 7 on the upper side, it is possible to confirm whether the printing is properly performed.

[0048] <S2: Longitudinal seal step> Next, the longitudinal seal portion 7 is formed by heat sealing with the longitudinal sealer 113. The longitudinal sealer 113 includes a pair of seal rolls. In accordance with the timing at which the film 2 moves at regular time intervals, while sandwiching the overlapping portion 8 of the film 2 with the pair of seal rolls, the pair of seal rolls are rotated in opposite directions to each other to perform heat sealing while feeding out the film 2. Thereby, the longitudinal seal portion 7 is formed. By forming the longitudinal seal portion 7 on the film 2, the cylindrical body 3 is formed. The first tear start portion 61 can be formed in the overlapping portion 8 using a cutter 131 disposed downstream of the longitudinal sealer 113. The first tear start portion 61 may be formed by other means or processes.

[0049] <S3: Transverse Sealing Step> Next, by rotating the feed roll 114, the cylindrical body 3 is moved downstream by a predetermined length, and as shown in FIG. 9, a predetermined position of the cylindrical body 3 is heat sealed by the transverse sealer 116 to form the transverse seal portion 11. The transverse seal portion 11 is configured such that the upper transverse seal portion 4 of the downstream packaging bag 1 and the lower transverse seal portion 5 of the upstream cylindrical body 3 are connected and are divided vertically in the cutting process described later. The transverse sealer 116 includes a pair of seal bars 116a and performs heat sealing by sandwiching the above-mentioned predetermined position with the pair of seal bars 116a for a predetermined time. The second tear start portion 62 is preferably formed using a cutter (not shown) provided in the transverse sealer 116, but may be formed by other means or processes.

[0050] In one example, the seal bar 116a has a shape in which convex ridges and concave ridges extending in the left-right direction of FIG. 1 are alternately arranged in the vertical direction. In this case, linear seal portions (portions indicated by dotted lines in FIG. 1) 4a and 5a are formed at the portions where the convex ridges are pressed.

[0051] <S4: Cutting Step> Next, by further rotating the feed roll 114, the transverse seal portion 11 is moved to the position of the press-cutter 118. The press-cutter 118 includes a pair of bars 118a.

[0052] Next, as shown in FIG. 10, the press-cutter 118 is closed to sandwich and cool the horizontal seal portion 11, and the horizontal seal portion 11 is cut by a cutter blade (not shown) and divided vertically, thereby forming the upper horizontal seal portion of the downstream packaging bag 1 and the lower horizontal seal portion 5 of the upstream cylindrical body 3. When the horizontal seal portion 11 of the downstream packaging bag 1 is cut, it drops onto the conveyor 130.

[0053] <S5: Filling Step> Next, as shown in FIG. 10, when the squeezing roll 115, which was in a closed state in the previous step, is opened, the content W that was introduced from the hopper 111 and accumulated above the squeezing roll 115 in the previous step drops to the lower side of the squeezing roll 115. Since the lower horizontal seal portion 5 is formed in the cylindrical body 3, the dropped content W is filled into the cylindrical body 3. A pair of shutter members 123 are arranged around the cylindrical body 3. The shutter members 123 are configured to be movable in the horizontal and vertical directions.

[0054] When the content W is further introduced into the cylindrical body 3 and the content W in the cylindrical body 3 reaches the position of the sensor 122, as shown in FIG. 11, the squeezing roll 115 is closed to divide the content W into an upper portion and a lower portion of the squeezing roll 115. The content in the lower portion of the squeezing roll 115 is the content for one bag of the packaging bag 1. Also, by closing the squeezing roll 115, a contact portion 3a is formed on the cylindrical body 3, and a bag portion 3b is formed, which is the portion where the content is accommodated between the contact portion 3a and the lower horizontal seal portion 5.

[0055] <S6: Feeding Step> Next, while keeping the squeezing roll 115 closed, the feeding roll 114 is rotated to move the contact portion 3a to the position of the shutter member 123, as shown in FIG. 11.

[0056] <S7: Clamping Step> Next, as shown in Fig. 12, the shutter member 123 is moved horizontally to pinch the upper contact portion 3a of the bag portion 3b, and then the shutter member 123 is moved vertically downward (see the arrows in Fig. 12), thereby imparting tension to the bag portion 3b. Here, it is preferable to move the shutter member 123 to a position lower than the horizontal sealing machine 116. In this way, it becomes possible to perform horizontal sealing while maintaining the tension imparted to the bag portion 3b.

[0057] Thereafter, by carrying out the lateral sealing process (S3) while maintaining the shutter member 123 above the bag portion 3b, the lateral seal portion 11 can be formed at a position (contact portion 3a) higher than the portion (bag portion 3b) filled with the contents W, while maintaining tension on the bag portion 3b, and the packaging bag 1 is formed.

[0058] 10, the shutter member 123 is returned to its original position, and the subsequent cutting step (S4) is carried out. As a result, the packaging bag 1 falls onto the conveyor 130, as shown in FIG.

[0059] In this manner, by repeating the steps S3 to S7, it is possible to continuously produce packaging bags 1 filled with the contents W. Note that, in the production of the packaging bag 1 in this embodiment, no heat treatment step is performed.

[0060] As described above, in the bag making and filling method of the present embodiment, the above-mentioned clamping step is performed on the cylindrical body 3, thereby giving the necessary tension to the packaging bag 1. EXAMPLES

[0061] 1. Manufacturing of packaging bags 1 <Example 1> Using the film 2 having the following configuration, a packaging bag 1 having the configuration shown in Figures 1 to 4 and the following dimensions was manufactured according to the bag making and filling method of the above embodiment. Flour paste was filled into the packaging bag 1. The S2 / S1 ratio of the film 2 was about 3.3.

[0062] Film 2 (3-layer laminate film consisting of a base layer, an adhesive layer, and a sealant layer) Base layer: Polyamide (Unitika Co., Ltd., Emblem NC-15, thickness 15 μm) Adhesive layer: Maleic anhydride modified polyethylene, thickness 5 μm Sealant layer: LLDPE (Skyfilm Co., HR543, thickness 50 μm)

[0063] ·Packaging bag 1 The length of the packaging bag 1 in the left-right direction: 200 mm Vertical length of packaging bag 1: 400 mm Length of the palm part 8 in the left-right direction: 20 mm Length of the vertical seal 7 in the left-right direction: 10 mm The length of the first opening start portion (notch) 61 in the left-right direction: 15 mm Vertical length from the inner edge 4b ​​of the upper horizontal seal portion 4 to the first tear start portion 61: 5 mm Vertical length of upper horizontal seal portion 4: 30 mm The vertical length of the second opening start portion (notch) 62: 10 mm Length in the left-right direction from one end 4c of the upper horizontal seal portion 4 to the second tear start portion 62: 105 mm

[0064] 2. Opening test In the first tearing process, the portions 8c and 8d on either side of the first tear initiation portion 61 of the joint portion 8 were pinched with both hands, and the portion 8d on the lower horizontal seal portion 5 side was pulled toward one end 4c of the upper horizontal seal portion 4 while being pulled toward the lower horizontal seal portion 5, thereby forming an opening 1b of the shape shown in Figure 5.

[0065] Next, in the second tearing step, the portions 4d, 4e on either side of the second tear start position 62a of the upper horizontal seal 4 were pinched with both hands, and while holding the portion 4d on one end 4c of the upper horizontal seal 4, the portion 4e on the other end 4f was pulled up, thereby enlarging the opening 1b as shown in Fig. 7. Note that the tearing in the first and second tearing steps stops at the inner edge of the lower horizontal seal 5, so that the portions of the packaging bag 1 peeled off in the first and second tearing steps remain connected to the remaining portion at the lower horizontal seal 5, making it easy to handle the packaging bag 1 after the contents W have been removed.

[0066] Through the above steps, an opening 1b extending over almost the entire front side of the packaging bag 1 can be formed as shown in FIG. [Explanation of symbols]

[0067] 1: Packaging bag 1b: Opening 2: Film 2a: One fate 2b: Other Relationships 3: Cylindrical body 4: Upper horizontal seal 4a: Linear seal part 4b: Inner border 4c: one end 4d: part 4e: Part 4f: other end 4l: Left curved part 4r: Right curved part 5: Lower horizontal seal 5a: Linear seal part 5l: Left curved part 5r: Right curved part 7: Vertical seal part 8: Gassho part 8a: Unsealed part 8b: Edge 8c: part 8d: part 8e: Border 9: Main body 9a: Back part 9b: Front side part 13 :Dash-dot line 14 :Dotted and dashed line 15: Middle area 16 :Dash-dot line 17 :Dash-dot line 61: 1st tear start part 61a: 1st tearing start position 62: 2nd tearing start part 62a: 2nd tearing start position 100: Bag making and filling machine 111: Hopper 112:Forma 113: Vertical sealing machine 114: Feed roll 115: Roll 116: Horizontal sealing machine 116a: Seal bar 118: Press and cutter 118a: Bar 119: Sensor 120: Payout roll 121: Payout roll 122: Sensor 123: Shutter parts 130: Conveyor 131: Cutter W: Contents

Claims

1. A packaging bag, The packaging bag includes a cylindrical body formed by forming a vertical seal portion in a film, an upper horizontal seal portion, a lower horizontal seal portion, and first and second tear initiation portions, the vertical seal portion is formed by bending the film into a cylindrical shape and welding the films together at a joint portion formed by overlapping an inner surface of one edge side and an inner surface of the other edge side of the film, The upper horizontal seal portion is provided to close the upper side of the cylindrical body, The lower horizontal seal portion is provided to close the lower side of the cylindrical body, The packaging bag is composed of the joint portion and a main body portion other than the joint portion, The first tear initiation portion is provided in the joint portion, The second tear initiation portion is provided in the upper horizontal seal portion, The method comprises the steps of: (a) defining the vertical length of the packaging bag as L; and (b) defining the vertical length from the inner edge of the upper horizontal seal portion to the first tear initiation portion as L1; and wherein L1 / L is 0 to 0.

2.

2. The packaging bag according to claim 1, A packaging bag in which the left-right length of the upper horizontal seal portion is Ws, and the left-right length from one left-right end of the upper horizontal seal portion to the second tear initiation portion is W1, W1 / Ws is 0.2 to 0.

8.

3. A method for removing contents from a packaging bag, comprising the steps of: The packaging bag includes a cylindrical body formed by forming a vertical seal portion in a film, an upper horizontal seal portion, and a lower horizontal seal portion, the vertical seal portion is formed by bending the film into a cylindrical shape and welding the films together at a joint portion formed by overlapping an inner surface of one edge side and an inner surface of the other edge side of the film, The upper horizontal seal portion is provided to close the upper side of the cylindrical body, The lower horizontal seal portion is provided to close the lower side of the cylindrical body, The packaging bag is composed of the joint portion and a main body portion other than the joint portion, The method includes a first tearing step and a second tearing step, In the first tearing step, the body portion is torn from a first tear start position at the joint portion toward the lower transverse seal portion to form an opening, In the second tearing step, the main body portion is torn so as to enlarge the opening from a second tear start position in the upper horizontal seal portion toward the lower horizontal seal portion, The method comprises the steps of: (a) defining the vertical length of the packaging bag as L; and (b) defining the vertical length from the inner edge of the upper horizontal seal portion to a first tear start position as L1; and wherein L1 / L is 0 to 0.

2.

4. 4. The method of claim 3, A method in which the left-right length of the upper horizontal seal portion is Ws, and the left-right length from one left-right end of the upper horizontal seal portion to a second tear start position is W1, where W1 / Ws is 0.2 to 0.

8.

5. 5. The method according to claim 3 or claim 4, In the first tearing process, the opening is formed by pulling a portion of the seam portion that is closer to the lower horizontal seal portion than the first tearing start position toward one end of the upper horizontal seal portion in the left-right direction.

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