Packaging bag and method for extracting contents from packaging bag

Abstract

Provided is a packaging bag in which a wide opening can easily be formed.　A packaging bag according to the present invention comprises: a cylindrical body configured by forming a vertical seal on a film; an upper horizontal seal; a lower horizontal seal; and first and second tear initiation portions. The vertical seal is formed by fusing the film to itself in a butt-seam portion formed by bending the film into a cylindrical shape and overlapping the inner surface of the film at one edge and the inner surface thereof at the other edge. The upper horizontal seal is provided so as to close an upper side of the cylindrical body, and the lower horizontal seal is provided so as to close the lower side of the cylindrical body. The packaging bag is composed of the butt-seam portion and a body portion other than said butt-seam portion. The first tear initiation portion is provided in the butt-seam portion. The second tear initiation portion is provided in the upper horizontal seal. If the length of the packaging bag in the vertical direction is L and the length in the vertical direction from the inner edge of the upper horizontal seal to the first tear initiation portion is L1, then L1 / L is 0 to 0.2.

Description

Packaging bag and method for removing contents from the packaging bag

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

[0002] Patent Document 1 discloses a packaging bag in which tearing begins at a tear initiation section provided in the seam section, and after the tear reaches the main body section, the tear spreads diagonally to both sides of the seam section and continues in the longitudinal direction of the vertical seal section. This type of packaging bag can be torn to form a wide opening.

[0003] Japanese Patent Application Laid-Open No. 2022-156808

[0004] (First aspect) While the packaging bag of Patent Document 1 has the advantage of being able to easily form a wide opening, the size of this opening may not allow the contents to be removed smoothly, and therefore a packaging bag that makes it easier to form a wider opening is desired.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a packaging bag in which a wide opening can be easily formed.

[0006] (Second aspect) The packaging bag of Patent Document 1 has the advantage that a wide opening can be easily formed along the vertical seal portion, and the contents can be easily removed from the packaging bag by allowing them to fall through this opening due to gravity.

[0007] The contents to be removed in this way include flower paste, but some flower pastes have low viscosity, and they may stick to the packaging bag and be difficult to remove from the bag. When trying to remove such flower paste by letting it fall by gravity through the opening, the flower paste may not fall easily, or even if it does fall, some of the flower paste may remain stuck to the packaging bag, and it may be necessary to scrape it off with a spatula or the like. This problem may occur not only with flower paste, but also with any contents that tend to stick to the packaging bag.

[0008] The present invention has been made in view of the above circumstances, and provides a method for easily removing contents that tend to stick to packaging bags.

[0009] (First Aspect) The present invention provides the following: [1] A 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 of the film with the inner surface of the other edge of the film to weld the films together at a seam portion formed by the bending the film into a cylindrical shape and overlapping the inner surface of the other edge of the film, the upper horizontal seal portion being arranged to close off the upper side of the cylindrical body, and the lower horizontal seal portion being arranged to close off 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 arranged at the seam portion and the second tear initiation portion being arranged at the upper horizontal seal portion, wherein L is the vertical length of the packaging bag and L1 is the vertical length from the inner edge of the upper horizontal seal portion to the first tear initiation portion, and L1 / L is 0 to 0.2. [2] The packaging bag according to [1], wherein Ws is the length in the left-right direction of the upper horizontal seal portion, and W1 is the length in the left-right direction from one end of the upper horizontal seal portion to the second tear initiation portion, and W1 / Ws is 0.2 to 0.8. [3] A method for removing contents from a packaging bag, wherein the packaging bag comprises 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 is formed by bending the film into a cylindrical shape and overlapping the inner surface of one edge of the film with the inner surface of the other edge of the film to form a seam portion, and the upper horizontal seal portion is arranged to close the upper side of the cylindrical body, and the lower horizontal seal portion is arranged to close the lower side of the cylindrical body, and the packaging bag comprises 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 is formed by welding the films together at a seam portion formed by bending the film into a cylindrical shape and overlapping the inner surface of one edge of the film with the inner surface of the other edge of the film, the upper horizontal seal portion is arranged to close the upper side of the cylindrical body, and the lower horizontal seal portion is arranged to close the lower side of the cylindrical body, and the packaging bag comprises a cylindrical body formed by forming a vertical seal portion on a film the method comprises a first tearing step and a second tearing step, in which in the first tearing step, the main body is torn from a first tearing start position at the seam portion toward the lower horizontal seal portion to form an opening, and in the second tearing step, the main body is torn 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 the 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 according to [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 a 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 while pulling a portion of the joining portion that is closer to the lower horizontal seal portion than the first tear start position toward one left-right end of the upper horizontal seal portion.

[0010] (Second Aspect) According to the present invention, the following inventions are provided. [1] A method for removing contents from a packaging bag, the method comprising: an opening forming step; and a squeezing step, wherein the contents are contained in the packaging bag; the packaging bag comprises 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 being formed by bending the film into a cylindrical shape and overlapping the inner surface of one edge of the film with the inner surface of the other edge of the film to form a seam portion, and the upper horizontal seal portion is arranged to close the upper side of the cylindrical body, and the lower horizontal seal portion is arranged 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, and the opening forming step forms an opening by tearing the main body portion so that tearing starting from a tear start position at the seam portion reaches the upper horizontal seal portion, and the squeezing step compresses a lower portion of the packaging bag that is closer to the lower horizontal seal portion than the tear start position, and the contents are squeezed out through the opening. [2] The method according to [1], wherein, where L is the vertical length of the packaging bag and L1 is the vertical length from the inner edge of the upper horizontal seal to the tear initiation position, L1 / L is 0 to 0.2. [3] The method according to [1] or [2], wherein the packaging bag has a tear initiation portion at the seam portion, and the tear initiation position is the position where the tear initiation portion is provided. [4] The method according to any one of [1] to [3], wherein the content has a viscosity of 1 to 1000 Pa s.

[0011] (First Aspect) In the packaging bag of the present invention, the main body portion of the packaging bag can be torn starting from a first tear initiation point to form an opening, and the main body portion can be torn starting from a second tear initiation point to enlarge the opening, making it possible to easily form a wider opening than that disclosed in Patent Document 1.

[0012] (Second Aspect) According to the method of the present invention, an opening is formed in the packaging bag, and the contents are squeezed out by compressing the packaging bag, so that the contents can be removed from the packaging bag. Since the contents are not removed by the action of gravity, they can be removed relatively easily even if the contents tend to stick to the packaging bag.

[0013] (First perspective) A plan view of the packaging bag 1 when no contents are contained. A perspective view of the packaging bag 1 when contents are contained. FIG. 3A is a cross-sectional view of a cross section perpendicular to the longitudinal direction D1 at the center of the longitudinal direction D1 of the vertical seal portion 7 when contents are filled in the packaging bag 1, and FIG. 3B is an enlarged view of region B in FIG. 3A. A plan view of the packaging bag 1 when contents are contained. A plan view showing the state after the opening 1b has been formed by the first tearing step from the state of FIG. 5. Note that the film peeled off in the first tearing step is not shown. A cross-sectional view corresponding to cross section A-A in FIG. 5, showing the state during the second tearing step from the state of FIG. 5. A cross-sectional view showing the state after the second tearing step has been performed from the state of FIG. 5. Note that the film peeled off in the second tearing step is not shown. A configuration diagram of the form-fill-seal machine 100. An enlarged view of the vicinity of the horizontal sealer 116 of the form-fill-seal machine 100, showing the state in which the horizontal seal portion 11 is being formed by the horizontal sealer 116. 9 shows the state after the horizontal sealing device 116 opens, the shutter member 123 returns to its initial position, the horizontal sealing unit 11 moves to the position of the press / cutter 118, the press / cutter 118 clamps and cuts the horizontal sealing unit 11, and then the press / cutter 118 and the ironing roll 115 open. From the state of FIG. 10 , this shows the state after the ironing roll 115 closes after the contents W are further added, and then the sealing unit 3a moves to the position of the shutter member 123. From the state of FIG. 11 , this shows the state after the shutter member 123 clamps the sealing unit 3a and moves vertically downward in that state. This is a diagram corresponding to FIG. 1 , showing the state in which the second tear initiation portion 62 is located to the right of the boundary line 8e between the joining portion 8 and the main body portion 9. (Second perspective) This is a plan view of the packaging bag 1 when no contents are contained. This is an oblique view of the packaging bag 1 when contents are contained. Fig. 16A is a cross-sectional view of a 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, and Fig. 16B is an enlarged view of region B in Fig. 16A. Fig. 17A is a perspective view showing the line along which the seam portion 8 and the main body portion 9 are torn when tearing of the seam portion 8 is initiated from the tear initiation portion 6, and Fig. 17B is an enlarged view of region B in Fig. 17A.1 is a perspective view showing the state after the tearing of the main body 9 reaches the upper horizontal seal 4 to form an opening 1b, and the state in which the contents W are squeezed out from the opening 1b.

[0014] Hereinafter, embodiments of the present invention will be described. Various features shown in the following embodiments can be combined with each other. Furthermore, each feature can be an invention independently. Furthermore, in the following embodiments, elements not specified in the claims are optional elements and can be omitted. Any number of "0"s (e.g., one or two) may be added to the end of numerical values ​​disclosed in the following description. For example, one or two "0"s may be added after "1.4" to make it "1.40" or "1.400". Furthermore, the contents described in the first aspect and the contents described in the second aspect can be combined with each other as long as they do not contradict the spirit of the invention.

[0015] (First Aspect) 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 cylindrical body 3 formed by forming a vertical seal 7 on a film 2, an upper horizontal seal 4, a lower horizontal seal 5, and first and second tear initiation portions 61, 62. The packaging bag 1 is normally filled with contents, but for convenience, Figure 1 shows the packaging bag 1 in an empty state. Examples of contents include viscous foods such as flour paste, jam, and bean paste.

[0016] 1 will be referred to as the up, down, left, and right of the packaging bag 1. Specifically, the axial direction of the cylindrical body 3 is the up and down direction. The left and right sides when the vertical seal portion 7 is positioned on the front side are the left and right sides of the packaging bag 1. The surface on the vertical seal portion 7 side is referred to as the front side, and the opposite surface is referred to as the back side. The up and down direction is the longitudinal direction D1 of the vertical seal portion 7, and the left and right direction is the orthogonal direction D2 perpendicular to the longitudinal direction D1.

[0017] The length of the packaging bag 1 in the left-right direction is, for example, 140 to 300 mm, 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 values ​​exemplified here. If this value is too small, the contents may adhere to the inner surface of the packaging bag 1 during bag formation and filling, making filling difficult. This problem is more pronounced when the contents are highly viscous. The value of [vertical length of packaging bag 1 / horizontal length of packaging bag 1] is, for example, 1.5 to 15, 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.

[0018] As shown in Figure 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. The unsealed portion 8a is preferably 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.

[0019] It is preferable that the joint portion 8 is in a laid-down state. The surface of the joint portion 8 facing the main body portion 9 may or may not be welded to the outer surface of the main body portion 9.

[0020] The left-right lengths of the gable portion 8 and the vertical seal portion 7 are each, for example, 5 to 50 mm, preferably 10 to 30 mm. Specific examples of these lengths are 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 mm, and may be within a range between any two of the values ​​exemplified here. The value of {left-right length of the vertical seal portion 7 / left-right length of the gable portion 8} is, for example, 0.2 to 1.0, and preferably 0.5 to 1.0. Specific examples of these lengths are 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0, and may be within a range between any two of the values ​​exemplified here.

[0021] The upper horizontal seal portion 4 and the lower horizontal seal portion 5 are provided 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 intersect the vertical seal portion 7 at right angles. The horizontal seal portions 4, 5 can each be formed by heat-sealing the cylindrical body 3.

[0022] In one example, the horizontal seals 4, 5 are composed of multiple linear seals 4a, 5a (areas indicated by dotted lines in FIG. 1) aligned vertically. Each linear seal 4a, 5a is arranged to extend in the left-right direction of the horizontal seal 4, 5. The multiple linear seals 4a, 5a are preferably arranged in parallel. The linear seals 4a, 5a are preferably arranged at a pitch of 2 to 5 mm. Specific examples of this pitch include 2, 2.5, 3, 3.5, 4, 4.5, and 5 mm, and may fall within a range between any two of the values ​​listed here.

[0023] The first tear initiation portion 61 is provided in the gable portion 8. The first tear initiation portion 61 is a portion configured to facilitate tearing of the gable portion 8, and is formed, for example, by a notch or cut. The first tear initiation portion 61 is preferably provided so as to extend from the edge 8b of the gable portion 8 to the vertical seal portion 7. The ratio (left-right length of the first tear initiation portion 61 / left-right length of the gable portion 8) is, for example, 0.1 to 0.9, and preferably 0.3 to 0.7. Specific examples of this value are 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9, and may be within a range between any two of the values ​​exemplified here.

[0024] 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 4 to the first tear initiation point 61 is L1, then L1 / L is preferably 0 to 0.2. Furthermore, 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 from the first tear initiation point 61 in the first tearing step described below will be too short, making it difficult to remove the contents. Specific examples of L1 / L are 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, and 2.0, and may be within a range between any two of the 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 values ​​exemplified here.

[0025] An additional first tear initiation portion 61 may be provided 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 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 of allowing a retry if an opening attempt is unsuccessful and allowing selection of a first tear initiation portion 61 that is easier to use depending on one's dominant hand.

[0026] 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 cutout. 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, then W1 / Ws is preferably 0.2 to 0.8, and more preferably 0.3 to 0.6. Providing the second tear initiation portion 62 near the left-right center of the packaging bag 1 in this manner facilitates widening of the opening 1b in the first tearing step described below. Specifically, W1 / Ws is, 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, and may be in a range between any two of the values ​​exemplified here.

[0027] The second tear initiation portion 62 may be located at a position that does not overlap with the folded-over gable portion 8, as shown in Fig. 1 . That is, it may be located to the left of the edge 8b of the gable portion 8, or to the right of the boundary line 8e between the gable 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 gable portion 8 is less likely to get in the way when forming the second tear initiation portion 62. Furthermore, by providing the second tear initiation portion 62 to the right of the boundary line 8e, the second tear initiation portion 62 can be positioned closer to the center of the packaging bag 1 in the left-right direction without overlapping with the gable portion 8.

[0028] The distance between the tips 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, and specifically, may be, for example, 10, 15, 20, 25, 30, 35, 40, 45, or 50 mm, or may be in a range between any two of the values ​​exemplified here.

[0029] The second tear initiation portion 62 may be provided on both sides of the boundary line 8e between the palm 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 of allowing retry if opening is unsuccessful and allowing selection of the second tear initiation portion 62 that is easiest to use depending on one's dominant hand.

[0030] In areas of the packaging bag 1 near the horizontal seals 4 and 5, the packaging bag 1 is less likely to expand, causing the packaging bag 1 to assume a flat shape and hindering rolling conveyance of the packaging bag 1. This tendency is particularly pronounced when the inner edges of the horizontal seals 4 and 5 do not have curved portions that convex outward at both ends, or when curved portions are provided but their length in the left-right direction is short.

[0031] Therefore, in this embodiment, left curved portions 4l, 5l and right curved portions 4r, 5r are provided at both ends of the inner edge of the horizontal seals 4, 5, convex outward. Furthermore, if the horizontal length of the horizontal seals 4, 5 is Ws and the horizontal lengths of the left curved portions 4l, 5l and right curved portions 4r, 5r are Wl and Wr, respectively, Wr / Ws and Wl / Ws are set to 0.1 to 0.4. By forming these curved portions, as shown in FIG. 2 , the packaging bag 1 can easily expand even near the horizontal seals 4, 5, resulting in a roughly cylindrical outer shape, which facilitates smooth rolling and transport of the packaging bag 1. While Wr and Wl are preferably the same, they may be different. 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 values ​​shown 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 values ​​exemplified here.

[0032] Furthermore, the left curved portions 4l, 5l and the right curved portions 4r, 5r are preferably arc-shaped, and when the radii of curvature are Rl and Rr, Rl / Ws and Rr / Ws are preferably 0.1 to 0.4, respectively. Specific examples of Rl / Ws and Rr / Ws are 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 values ​​exemplified here. Rl and Rr are, for example, 20 to 60 mm, and preferably 30 to 50 mm. Specific examples of Rl and Rr are 20, 25, 30, 35, 40, 45, 50, 55, and 60 mm, and may be within a range between any two of the values ​​exemplified here.

[0033] The packaging bag 1 filled with the contents has a substantially elliptical cylindrical shape. As shown in FIG. 3 , when the contents are filled in the packaging bag 1, the circularity of a cross section perpendicular to the longitudinal direction D1 at the center of the longitudinal direction D1 of the vertical seal portion 7 is preferably 0.5 or more. The larger the circularity value, the closer the cross-sectional shape is to a circle. In this specification, circularity is defined as D1 / D2, where D1 and D2 are the inscribed circle diameter and 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, or 1.0, and may be within a range between any two of the values ​​exemplified here.

[0034] The film 2 is preferably a laminated film having a substrate layer and a sealant layer, and more preferably has an adhesive layer between the substrate layer and the sealant layer.

[0035] 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 together to form the vertical seal portion 7 and the horizontal seal portions 4 and 5.

[0036] The base layer is made of a material having excellent strength and high impact resistance, such as polyamide, polyolefin, polyethylene, etc. The adhesive layer is a layer for adhering the base layer and the sealant layer so that they are laminated together, and such an adhesive layer is made of, for example, polyethylene, etc.

[0037] The polyamide of the base layer preferably contains an aromatic polyamide, because in this case the base layer has linear cut properties in the MD direction and excellent barrier properties. The aromatic polyamide is not particularly limited, but a resin containing 70 mol % or more of polyamide structural units composed of xylylenediamine and an 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, but polymetaxylylene adipamide (hereinafter referred to as "MXD6") is preferred because it has excellent basic properties such as strength and gas barrier properties, and is relatively easy to obtain industrially.

[0038] The sealant layer can be formed from a resin with excellent heat-sealing properties. For example, the sealant layer can be formed from linear low-density polyethylene. The film constituting the sealant layer is preferably one that can be cut linearly in the MD direction.

[0039] It is also preferable that at least one of the substrate 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 substrate layer, and is preferably at least half the thickness of the entire film 2.

[0040] The film 2 can be formed by laminating a substrate 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 typically has a thickness of 50 μm to 100 μm.

[0041] The substrate layer and the sealant layer are laminated and bonded together by an adhesive layer. For example, polyethylene can be used as the adhesive layer, and the substrate layer and the sealant layer can be bonded together using an extrusion lamination method. Alternatively, a material other than polyethylene can be used as the adhesive layer, and the substrate layer and the sealant layer can be bonded together using a dry lamination method. Alternatively, fusion bonding without an adhesive layer can be used. The film 2 formed from the substrate layer, adhesive layer, and sealant layer in this way has high strength, impact resistance, sealing properties, airtightness, etc.

[0042] The film 2 preferably has a ratio S2 / S1 of 1.5 to 10, more preferably 2 to 6, where S1 is the first tear strength, which is the tear strength in the longitudinal direction D1, and S2 is the second tear strength, which is the tear strength in the orthogonal direction D2. Tear strength can be measured in accordance with JIS K7128. Tear strength is an index indicating the amount of force required to tear the film 2; a higher tear strength value indicates a higher tear resistance of the film 2. S2 / S1 indicates the degree to which tearing is more difficult in the orthogonal direction D2 than in the longitudinal direction D1; a higher value indicates a higher tear resistance of the film 2 in the longitudinal direction D1. The value of S2 / S1 affects how the film 2 tears when tearing is initiated from the first tear initiation region 61. When S2 / S1 is within the above range, a wide opening 1b is likely to be formed extending over a wide area 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 values ​​exemplified here.

[0043] 2. Method for 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 using Figures 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 tear initiation positions 61a and 62a are the positions where tearing begins, respectively. In the following description, the first and second tear initiation portions 61 and 62 are referred to as the first and second tear initiation 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 tear initiation positions 61 and 62. For example, a cut may be formed using a tool such as scissors, and the resulting position may be the first tear initiation position 61a or the second tear initiation position 62a. The description of the first and second tear initiation positions 61 and 62 also applies to the first and second tear initiation positions 61a and 62a, provided that it does not contradict the spirit of the description.

[0044] <First tearing step> In the first tearing step, as shown in Figures 4 and 5, the opening 1b is formed by tearing the main body portion 9 from the first tearing start position 61a at the joining portion 8 toward the lower horizontal seal portion 5.

[0045] In the first tearing step, the opening 1b is preferably formed by pulling a portion 8d of the seam 8, which is closer to the lower horizontal seal 5 than the first tearing start position 61a, toward the left-right end 4c of the upper horizontal seal 4. As a result, the main body 9 is torn in a manner biased toward the end 4c of the upper horizontal seal 4, as shown by the dashed-dotted lines 13 and 14 in Figure 4, and an opening 1b is formed that is biased toward the end 4c of the upper horizontal seal 4, as shown in Figure 5. The opening 1b is formed in an intermediate region 15 between the dashed-dotted lines 13 and 14. An opening 1b biased toward the end 4c is advantageously easy to enlarge in the second tearing step.

[0046] In one example, the first tearing step involves pinching the regions 8c and 8d of the seam 8 on either side of the first tear start position 61a with both hands, pulling the region 8d on the lower horizontal seal 5 side toward the end 4c of the upper horizontal seal 4, while simultaneously pulling the region 8d toward the lower horizontal seal 5. This causes tearing to progress as shown by dashed lines 13 and 14. Preferably, the dashed line 13 is the boundary 8e between the seam 8 and the main body 9, and a fold is provided at the boundary 8e, making it easier for the main body 9 to tear along the boundary 8e. Furthermore, the dashed line 14 progresses diagonally from the boundary 8e toward the end 4c and then in a direction substantially parallel to the longitudinal direction D1 of the vertical seal 7.

[0047] 5 and 6, in the second tearing step, the main body 9 is torn from the second tearing start position 62a in the upper horizontal seal 4 toward the lower horizontal seal 5 so as to enlarge the opening 1b. As a result, an enlarged opening 1b is formed, as shown in FIG. 7, making it easier to remove the contents W.

[0048] In one example, the second tearing step can be performed by pinching the upper horizontal seal portion 4 at the regions 4d and 4e on either side of the second tear initiation position 62a 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. This causes the tearing that started at the second tear initiation position 62a to reach the opening 1b along the dash-dotted line 17, and the main body portion 9 is divided along the dash-dotted line 16. As shown in Fig. 6, the front region 9b is peeled away from the contents W with the back region 9a positioned below the contents W. This enlarges the opening 1b, facilitating removal of the contents W, as shown in Fig. 7.

[0049] It is preferable that the tearing in the first and second tearing steps be stopped at the inner edge of the lower horizontal seal 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 5, which improves the handling properties of the packaging bag 1 when processing it after the contents W have been removed.

[0050] 8 to 12, a bag-making and filling method using the film 2 will be described. This method can be carried out using a vertical bag-making and filling machine 100.

[0051] <S1: Film Curving Step> First, film 2 unwound from roll F is guided to former 112 via multiple unwound rolls 120, 121. A sensor 119 is disposed midway along the path from roll F to former 112, and detects registration marks printed at regular intervals along the length of film 2, enabling a fixed length of film 2 to be sent out at regular time intervals onto the track of bag-making and sealing machine 100. As film 2 passes through former 112, it is curved into a cylindrical shape, and the inner surfaces of one edge 2a and the other edge 2b of film 2 are overlapped to form seam 8.

[0052] A printing step may be provided in which printing is performed on the film 2 at a position before the former 112. This printing is preferably performed in the area that will become the front surface of the packaging bag 1 (the surface on the vertical seal portion 7 side). In this case, it is possible to check whether the printing is appropriate when the packaging bag 1 that has fallen onto the conveyor 130 in the cutting step described below is transported with the vertical seal portion 7 facing upward.

[0053] <S2: Vertical Sealing Step> Next, the vertical seal portion 7 is formed by heat sealing using the vertical sealer 113. The vertical sealer 113 has a pair of seal rolls, and performs heat sealing while feeding out the film 2 by rotating the pair of seal rolls in opposite directions while clamping the seam portion 8 of the film 2 in synchronization with the movement of the film 2 at regular time intervals. This forms the vertical seal portion 7. By forming the vertical seal portion 7 in the film 2, the cylindrical body 3 is formed. A first tear initiation portion 61 can be formed in the seam portion 8 using a cutter 131 arranged downstream of the vertical sealer 113. The first tear initiation portion 61 may be formed by another means or process.

[0054] <S3: Lateral Sealing Step> Next, the feed roll 114 is rotated to move the cylindrical body 3 downstream a predetermined distance. As shown in FIG. 9 , a predetermined position of the cylindrical body 3 is heat-sealed by a horizontal sealing machine 116 to form a horizontal seal portion 11. The horizontal seal portion 11 is configured by connecting the upper horizontal seal portion 4 of the packaging bag 1 on the downstream side with the lower horizontal seal portion 5 of the cylindrical body 3 on the upstream side, and is divided into upper and lower halves in the cutting step described below. The horizontal sealing machine 116 is equipped with a pair of seal bars 116a, and performs heat sealing by clamping the predetermined position between the pair of seal bars 116a for a predetermined period of time. The second tear initiation portion 62 is preferably formed using a cutter (not shown) provided in the horizontal sealing machine 116, but may be formed by other means or steps.

[0055] In one example, the seal bar 116a has a shape in which convex and concave stripes extending in the left-right direction in Fig. 1 are arranged alternately in the up-down direction. In this case, linear seal portions 4a and 5a (portions indicated by dotted lines in Fig. 1) are formed in the areas where the convex stripes are pressed.

[0056] <S4: Cutting Step> Next, the feed roll 114 is further rotated to move the horizontal sealing unit 11 to the position of the press / cutter 118. The press / cutter 118 includes a pair of bars 118a.

[0057] 10 , press / cutter 118 is closed to clamp and cool horizontal seal 11, and a cutter blade (not shown) is used to cut horizontal seal 11 and divide it into an upper and lower part, thereby forming an upper horizontal seal part for downstream packaging bag 1 and a lower horizontal seal part 5 for upstream cylindrical body 3. After horizontal seal 11 is cut, downstream packaging bag 1 falls onto conveyor 130.

[0058] <S5: Filling Step> Next, as shown in Figure 10, when the squeezing roll 115, which was closed in the previous step, is opened, the contents W that were poured from the hopper 111 in the previous step and that have accumulated above the squeezing roll 115, fall to the bottom of the squeezing roll 115. Because the lower horizontal seal portion 5 is formed in the cylindrical body 3, the fallen contents W are 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 horizontally and vertically.

[0059] The contents W are further poured into the cylindrical body 3, and when the contents W inside the cylindrical body 3 reach the position of the sensor 122, the squeezing roll 115 is closed, dividing the contents W into an upper portion and a lower portion of the squeezing roll 115, as shown in Figure 11. The contents in the portion below the squeezing roll 115 constitute one bag's worth of contents for the packaging bag 1. Furthermore, closing the squeezing roll 115 forms a sealed portion 3a in the cylindrical body 3, and a bag portion 3b containing the contents is formed between the sealed portion 3a and the lower transverse seal portion 5.

[0060] <S6: Feeding Step> Next, the feeding roll 114 is rotated while the squeezing roll 115 is kept closed, thereby moving the contact portion 3a to the position of the shutter member 123 as shown in FIG.

[0061] <S7: Clamping Step> Next, as shown in Fig. 12, the shutter member 123 is moved horizontally to clamp the upper sealed 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 that the shutter member 123 is moved below the horizontal sealing machine 116. In this way, it is possible to perform horizontal sealing while maintaining the tension imparted to the bag portion 3b.

[0062] Thereafter, by carrying out the horizontal sealing process (S3) while maintaining the shutter member 123 above the bag portion 3b, the horizontal sealing portion 11 can be formed at a position (sealing portion 3a) higher than the portion (bag portion 3b) filled with the contents W, while maintaining tension in the bag portion 3b, and the packaging bag 1 is formed.

[0063] 10, the shutter member 123 is returned to its original position, and the subsequent cutting step (S4) is carried out, whereby the packaging bag 1 falls onto the conveyor 130, as shown in FIG.

[0064] 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.

[0065] As described above, in the bag making and filling method of this embodiment, the necessary tension is imparted to the packaging bag 1 by performing the above-mentioned clamping process on the cylindrical body 3.

[0066] (Second Aspect) 1. Packaging Bag 1 A packaging bag 1 according to a second aspect of the present invention will be described. The configuration of the packaging bag 1 is similar to that of the first aspect, and the details described in the first aspect can also be applied to this embodiment as long as they are not contrary to the spirit of the first aspect. The following description will focus on the differences.

[0067] As shown in Figures 14 to 17, a packaging bag 1 according to one embodiment of the present invention includes a cylindrical body 3 formed by forming a vertical seal 7 on a film 2, an upper horizontal seal 4, a lower horizontal seal 5, and a tear initiation section 6. While the packaging bag 1 is typically filled with contents, Figure 14 illustrates the packaging bag 1 in an empty state for convenience. Examples of contents include viscous foods such as flour paste, jam, and bean paste. The viscosity of the contents is preferably 1 to 1,000 Pa·s. In this case, the contents tend to stick to the packaging bag 1, making it difficult to remove the contents from the packaging bag 1 due to the action of gravity, making the application of the present invention particularly significant. In this specification, viscosity refers to a value measured at 23°C in accordance with JIS Z8803. This viscosity is preferably 10 to 500 Pa·s, and more preferably 20 to 100 Pa·s. Specific examples of this viscosity include 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, and 1000 Pa·s, and may be in a range between any two of the values ​​exemplified here.

[0068] The gable portion 8 preferably has a tear initiation portion 6. The tear initiation portion 6 is a portion configured to facilitate tearing of the gable portion 8, and is formed, for example, by a notch or cut. The provision of the tear initiation portion 6 makes it easy to start tearing the gable portion 8 without using a tool such as scissors. The tear initiation portion 6 is preferably provided so as to extend from the edge 8b of the gable portion 8 to the vertical seal portion 7. The ratio (left-right length of the tear initiation portion 6 / left-right length of the gable portion 8) is, for example, 0.1 to 0.9, and preferably 0.3 to 0.7. Specific examples of this value are 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9, and may be within a range between any two of the values ​​exemplified here.

[0069] 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 4 to the tear initiation point 6 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 these values ​​are too large, when forming the opening 1b in the opening formation step described below, too much content will be placed on the upper horizontal seal 4 side of the tear initiation point 6, which could result in the content unintentionally falling out of the packaging bag 1 and being wasted. 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 a range between any two of the numerical values ​​exemplified here. Specifically, L1 is, 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.

[0070] The tear initiation portion 6 is preferably provided between the left curved portion 4l and the right curved portion 4r, in which case it is easier to form a large opening 1b in the opening forming step described below.

[0071] If the first tear strength of the film 2 is S1, which is the tear strength in the longitudinal direction D1, and the second tear strength of the film 2 is S2, which is the tear strength in the perpendicular direction D2, then S2 / S1 is preferably 1.5 to 10, and more preferably 2 to 6. The value of S2 / S1 affects how the film 2 tears when tearing is initiated from tear initiation position 6a, and if S2 / S1 is within the above range, a wide opening 1b is likely to be formed. The explanation of tear strength and S2 / S1 is the same as in the first aspect.

[0072] 2. Method for Removing Contents from Packaging Bag 1 The method for removing contents from packaging bag 1 according to one embodiment of the present invention comprises an opening forming step and a squeezing step. Each step will be described in detail below.

[0073] <Opening Forming Process> In the opening forming process, as shown in Figures 17 and 18 , the opening 1b is formed by tearing the main body 9 so that the tearing starts from the tearing start position 6a at the joining portion 8 and reaches the upper horizontal seal portion 4.

[0074] The tear start position 6a is the position where tearing begins, and if the tear start portion 6 is provided in the joint portion 8, it is preferable that the position where the tear start portion 6 is provided be the tear start position 6a. If the tear start portion 6 is not provided in the joint portion 8, for example, a cut may be made in the joint portion 8 using a tool such as scissors, and the cut may be used as the tear start position 6a.

[0075] 17 , when the seam 8 is held upright near the tear-start position 6a, and the seam 8 is pinched with both hands at regions 8c and 8d on either side of the tear-start position 6a, and the region 8c on the upper horizontal seal 4 side is pulled strongly toward the upper horizontal seal 4, the seam 8 is first torn as shown by the dash-dotted line 12 in FIGS. 14 and 17B . Then, when the tear reaches the main body 9, the tear spreads diagonally across the seam 8 as shown by the dash-dotted lines 13 and 14, continuing until it reaches the upper horizontal seal 4. This forms a wide opening 1b in the intermediate region 15 between the dash-dotted lines 13 and 14, allowing the contents of the packaging bag 1 to be easily squeezed out through this opening 1b. The dash-dotted lines 13 and 14 are preferably symmetrical with respect to the boundary 8e between the seam 8 and the main body 9. Even after the opening 1b is formed, the intermediate region 15 remains connected to the top horizontal seal 4 and is not separated from the rest of the packaging bag 1, preventing the intermediate region 15 from being mixed in as a foreign body with the contents W. The intermediate region 15 is not shown in Figures 18 and 19. Furthermore, if tearing is started from the top horizontal seal 4, film fragments are likely to be generated and the curved portions 4l, 4r can make tearing difficult. However, the method of this embodiment prevents film fragments from being generated and does not make tearing difficult due to the curved portions 4l, 4r.

[0076] 14, if the width of the portion where the width of the intermediate region 15 is greatest is Wc, Wc / Ws is, for example, 0.3 to 1.0, preferably 0.4 to 0.8, and specifically, for example, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0, or may be within a range between any two of the values ​​exemplified here. If this value is too small, it will be difficult to remove the contents.

[0077] The tearing of the main body portion 9 may be stopped when it reaches the upper horizontal seal portion 4, or after it reaches the upper horizontal seal portion 4, the tearing may be continued along the inner edge 4b ​​of the upper horizontal seal portion 4 to widen the opening 1b.

[0078] The opening forming step may be completed before or during the squeezing step. In the latter case, for example, the opening 1b may be formed before the squeezing step, but the tearing of the main body 9 may not reach the upper horizontal seal 4, and the tearing of the main body 9 may progress to reach the upper horizontal seal 4 as the contents are squeezed out through the opening 1b in the squeezing step.

[0079] 19 , in the squeezing step, the lower region 1c of the packaging bag 1, which is closer to the lower horizontal seal 5 than the tear start position 6a, is compressed to squeeze out the contents W through the opening 1b. This step can be performed, for example, by moving a hand gripping the lower region 1c from the lower horizontal seal 5 toward the opening 1b. Furthermore, by repeating this step multiple times, the amount of contents remaining in the packaging bag 1 can be reduced.

[0080] 3. Bag-making and filling method The bag-making and filling method of this embodiment can be carried out in the same manner as "3. Bag-making and filling method" of the first aspect, except that tear-starting portion 6 is formed instead of first and second tear-starting portions 61, 62. Tear-starting portion 6 may be formed in the same manner as first tear-starting portion 61, or may be formed after the bag-making and filling process is completed.

[0081] (First Aspect) 1. Manufacturing of Packaging Bag 1 Example 1 A packaging bag 1 having the configuration shown in Figures 1 to 4 and the dimensions shown below was manufactured using a film 2 having the following configuration and 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 approximately 3.3.

[0082] Film 2 (three-layer laminate film consisting of a base layer, adhesive layer, and 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 (Sky Film Co., Ltd., HR543, thickness 50 μm)

[0083] Packaging bag 1 Left-right length of packaging bag 1: 200 mm Up-down length of packaging bag 1: 400 mm Left-right length of gable portion 8: 20 mm Left-right length of vertical seal portion 7: 10 mm Left-right length of first opening start portion (notch) 61: 15 mm Up-down length from inner edge 4b ​​of upper horizontal seal portion 4 to first tear start portion 61: 5 mm Up-down length of upper horizontal seal portion 4: 30 mm Up-down length of second opening start portion (notch) 62: 10 mm Left-right length from one end 4c of upper horizontal seal portion 4 to second tear start portion 62: 105 mm

[0084] 2. Opening test In the first tearing step, 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 the end 4c of the upper horizontal seal portion 4 while also being pulled toward the lower horizontal seal portion 5, thereby forming an opening 1b having the shape shown in FIG. 5 .

[0085] Next, in the second tearing step, portions 4d, 4e of the upper horizontal seal 4 on either side of the second tearing start position 62a were grasped with both hands, and while holding portion 4d on one end 4c of the upper horizontal seal 4, portion 4e on the other end 4f was pulled up, thereby enlarging the opening 1b as shown in Figure 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 that were 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.

[0086] Through the above steps, an opening 1b extending over almost the entire front side of the packaging bag 1 could be formed as shown in FIG.

[0087] (Second Viewpoint) 1. Manufacturing of Packaging Bag 1 Using a film 2 having the following configuration, a packaging bag 1 having the configuration shown in Figures 14 to 17 and the following dimensions was manufactured according to the bag-making and filling method of the above embodiment. Flour paste (viscosity measured at 23°C: 50 Pa s) was filled into the packaging bag 1. The S2 / S1 ratio of the film 2 was approximately 3.3.

[0088] Film 2 (three-layer laminate film consisting of a base layer, adhesive layer, and 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 (Sky Film Co., Ltd., HR543, thickness 50 μm)

[0089] Packaging bag 1 Left-right length of packaging bag 1: 200 mm Up-down length of packaging bag 1: 600 mm Left-right length of gable portion 8: 20 mm Left-right length of vertical seal portion 7: 10 mm Left-right length of opening start portion (slit): 15 mm Up-down length from inner edge 4b ​​of upper horizontal seal portion 4 to tear start portion 6: 5 mm

[0090] 2. Content Removal Test The contents were removed from the packaging bag 1 filled with the contents W manufactured by the above-described method by the methods shown in Example 1 and Comparative Example 1 below, and the amount of the contents W remaining in the packaging bag 1 was measured. As a result, it was found that the amount of the contents W remaining in the packaging bag 1 was reduced in Example 1 compared to Comparative Example 1. In Comparative Example 1, the amount of the contents W remaining could also be reduced by scraping off the contents W with a spatula or the like, but this requires time and effort. On the other hand, according to the method of the example of the present invention, the amount of the contents W remaining can be reduced without requiring time and effort.

[0091] <Example 1> As shown in Figures 17 and 18, an opening 1b was formed between the tear initiation portion 6 and the upper horizontal seal portion 4 by pinching both sides of the tear initiation portion 6 with both hands and strongly pulling the portion 8c on the upper horizontal seal portion 4 side toward the upper horizontal seal portion 4 to tear the main body portion 9.

[0092] 19, the hand gripping the lower region 1c was moved from the vicinity of the lower horizontal seal 5 toward the opening 1b to squeeze out the contents W from the opening 1b, and this process was repeated five times. After that, the remaining amount of the contents W in the packaging bag 1 was measured, and it was found to be 1% by mass or less of the original amount of the contents W.

[0093] <Comparative Example 1> An opening 1b was formed between the tear initiation portion 6 and the lower horizontal seal portion 5 by pinching both sides of the tear initiation portion 6 with both hands and pulling strongly on the portion on the lower horizontal seal portion 5 side to tear the main body portion 9.

[0094] Next, with the opening 1b facing downward, an attempt was made to drop the contents W through the opening 1b by gently vibrating the packaging bag 1.

[0095] As a result, although most of the contents W fell, a portion of the contents W remained attached to the packaging bag 1, and the remaining amount was 10% by mass of the original amount of the contents.

[0096] 1: Packaging bag, 1b: opening, 1c: lower part, 2: film, 2a: one edge, 2b: other edge, 3: cylinder, 3a: close contact part, 3b: bag part, 4: upper horizontal seal part, 4a: linear seal part, 4b: inner edge, 4c: one end, 4d: part, 4e: part, 4f: other end, 4l: left curved part, 4r: right curved part, 5: bottom Side horizontal seal part, 5a: linear seal part, 5l: left curved part, 5r: right curved part, 6: tear start part, 6a: tear start position, 7: vertical seal part, 8: palms together part, 8a: unsealed part, 8b: edge, 8c: part, 8d: part, 8e: boundary line, 9: main body part, 9a: back side part, 9b: front side part, 11: lateral seam 1: roll portion, 15: intermediate region, 61: first tear initiation portion, 61a: first tear initiation position, 62: second tear initiation portion, 62a: second tear initiation position, 100: bag-making and filling machine, 111: hopper, 112: former, 113: vertical sealing machine, 114: feed roll, 115: roll, 116: horizontal sealing machine, 116a: seal bar, 118: press / cutter, 118a: bar, 119: sensor, 120: feeding roll, 121: feeding roll, 122: sensor, 123: shutter member, 130: conveyor, 131: cutter, D1: longitudinal direction, D2: orthogonal direction, F: roll-shaped raw material, W: contents

Claims

1. A 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 of the film with the inner surface of the other edge of the film to form a seam portion to bond the films together, the upper horizontal seal portion being arranged to close off the upper side of the cylindrical body, and the lower horizontal seal portion being arranged to close off 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 arranged at the seam portion, and the second tear initiation portion being arranged at the upper horizontal seal portion, where L is the vertical length of the packaging bag and L1 is the vertical length from the inner edge of the upper horizontal seal portion to the first tear initiation portions, and L1 / L is between 0 and 0.

2.

2. A packaging bag as described in claim 1, in which the left-right length of the upper horizontal seal is Ws, and the left-right length from one left-right end of the upper horizontal seal to the second tear initiation point is W1, with W1 / Ws being 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 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 this, the upper horizontal seal portion being arranged to close the upper side of the cylindrical body, and the lower horizontal seal portion being arranged 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 method comprising a first tearing step and a second tearing step, the first tearing step comprising tearing the main body portion from a first tearing start position at the seam portion toward the lower horizontal seal portion to form an opening, and the second tearing step comprising tearing the main body portion so as to enlarge the opening from a second tearing start position at 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. A method according to claim 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. A method according to claim 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 left-right end of the upper horizontal seal portion.

6. A method for removing contents from a packaging bag, comprising: an opening forming step; and a squeezing step, wherein the contents are contained within the packaging bag; the packaging bag comprises 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 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 is arranged to close off the upper side of the cylindrical body, and the lower horizontal seal portion is arranged to close off 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, wherein in the opening forming step, an opening is formed by tearing the main body portion so that tearing starting from a tear start position at the seam portion reaches the upper horizontal seal portion, and in the squeezing step, a lower portion of the packaging bag closer to the lower horizontal seal portion than the tear start position is compressed to squeeze out the contents through the opening.

7. The method according to claim 6, wherein, when the vertical length of the packaging bag is L and the vertical length from the inner edge of the upper horizontal seal to the tear start position is L1, L1 / L is between 0 and 0.

2.

8. A method according to claim 6 or 7, wherein the packaging bag has a tear initiation portion at the seam portion, and the tear initiation position is the position where the tear initiation portion is provided.

9. The method according to claim 6 or 7, wherein the content has a viscosity of 1 to 1000 Pa·s.

Images