Packaging bag

Abstract

To provide a packaging bag technique capable of suppressing material and cost, and of easily measuring a volume of an object.SOLUTION: A packaging bag exhibiting a self-standing property is formed by heat-fusing circumferential edges of a front face sheet constituting a trunk part, a back face sheet, and a bottom face sheet constituting a bottom part, with a substrate layer of a substrate film and a heat-fusing layer of the substrate film as an outside face and an inside face, respectively. The packaging bag comprises a seal part bonding the front face sheet and the back face sheet, and the bottom face sheet, into a bag shape. A first guideline for generating a fold that becomes a marked line for measuring a volume of a measuring object on the inside face of the packaging bag is provided in parallel to an outer edge of the bottom part, on the outside face of the front face sheet or the back face sheet.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a packaging bag capable of measuring the volume of an object to be weighed. [Background technology]

[0002] Conventionally, as packaging bags for containing contents, packaging bags (standing pouches) with a wide bottom and self-supporting properties have been used (see, for example, Patent Document 1). Such packaging bags are constructed by, for example, sandwiching a sheet member that will become the bottom between two sheet members formed of a laminate such as a laminate film, and sealing the periphery. When filled with contents, the central area of ​​the sheet member that will become the bottom expands due to the contained contents, making the packaging bag self-supporting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-72083 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is a demand for measuring the volume of an object to be weighed using a packaging bag after the contents have been removed, for example, when it is desired to measure the amount of water to be added when cooking food using solid or liquid seasoning contained in the packaging bag.

[0005] However, when storing foods, seasonings, medicines, etc. that require long-term storage at room temperature, it may be difficult to print measuring marks on the inside of the packaging bag due to the material of the packaging bag. It is also possible to add a printing layer on which the measuring marks can be printed to the laminate that makes up the packaging bag, but adding the printing layer would increase the amount of materials and the cost.

[0006] The present invention aims to provide a packaging bag technology that reduces materials and costs and enables the volume of an object to be easily measured. [Means for solving the problem]

[0007] The present inventors conducted extensive research and found that the above-mentioned problems can be solved by adopting the following configuration for the packaging bag. That is, the packaging bag according to one embodiment is a self-supporting packaging bag formed by heat-sealing the periphery of a front sheet, a back sheet, and a bottom sheet that constitute a body, with the base layer of the base film as the outer surface and the heat-sealing layer of the base film as the inner surface. A first guide line is provided on the outer surface of the front sheet or the back sheet, parallel to the outer edge of the bottom, for generating a fold that serves as a mark line for measuring the volume of the items to be weighed on the inner surface of the packaging bag.

[0008] A more detailed configuration is as follows. [1] A self-supporting packaging bag formed by heat-sealing the periphery of a front sheet, a back sheet, and a bottom sheet constituting a bottom portion, with a base layer of a base film as an outer surface and a heat-sealing layer of the base film as an inner surface, the packaging bag comprising: a seal portion that bonds the front sheet, the back sheet, and the bottom sheet together in a bag shape; The outer surface of the front sheet or the back sheet is attached to the inner surface of the packaging bag. A first guide line for generating a fold that serves as a benchmark for measuring volume is provided parallel to the outer edge of the bottom. packaging bag. [2] The packaging bag described in [1], wherein a second guide line is provided on the outer surface of the front sheet or the back sheet, perpendicular to the first guide line, near the center of the front sheet or the back sheet, for creating a fold that serves as a marking line on the inner surface of the packaging bag to maintain self-supporting and openability when opened. [3] The packaging bag described in [1] or [2], wherein a group of guide lines is provided on the outer surface of the front sheet or the back sheet, parallel to the outer edge of the bottom, for creating folds that serve as benchmark lines for measuring the volume of an object to be weighed on the inner surface of the packaging bag. [4] The packaging bag according to [1], wherein the base film has an intermediate layer including aluminum foil bonded between the base layer and the heat-sealing layer via an adhesive layer. [5] The packaging bag according to [1] or [2], wherein the base layer includes a paper base material, a laminate of a paper base material, or a laminate of a resin film and a paper base material. Effect of the Invention

[0009] According to the present invention, a packaging bag technology can be provided that reduces materials and costs and enables the volume of an object to be easily measured. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic plan view showing one example of a packaging bag according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. [Diagram 3] FIG. 3 is a schematic cross-sectional view showing an example of a layer structure of a base film constituting a packaging bag according to an embodiment. [Figure 4] FIG. 4 is a schematic plan view showing the packaging bag according to the first embodiment. [Diagram 5] FIG. 5 is a diagram for explaining a procedure for forming folds that serve as measuring lines on the inside of the packaging bag according to the first embodiment. [Figure 6] FIG. 6 is a diagram illustrating the marked lines formed on the inside of the packaging bag according to the first embodiment. [Figure 7] FIG. 7 is a schematic plan view showing a packaging bag according to Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A packaging bag according to one mode for carrying out the invention (hereinafter, also referred to as one embodiment or embodiment) will be described below with reference to the drawings. The configuration of the following embodiment is an example, and the packaging bag is not limited to the configuration of the embodiment. Furthermore, unless otherwise specified, the dimensions, materials, shapes, relative positions, etc. of the components disclosed in this embodiment are not intended to limit the technical scope of the invention to only those.

[0012] (Packaging bag composition) First, the configuration of the packaging bag 1 according to this embodiment will be described. Fig. 1 is a schematic plan view showing one example of the packaging bag 1 according to this embodiment. Fig. 1 illustrates a schematic plan view of the packaging bag 1 in an unopened state with contents contained therein. Fig. 2 is a cross-sectional view taken along line AA in Fig. 1. Fig. 3 is a schematic cross-sectional view showing an example of the layer structure of the base film 2 constituting the packaging bag 1 according to this embodiment. Fig. 3 illustrates a layer structure of the base film 2 which is a laminate including a base layer 7, an intermediate layer 5, and a sealant layer (thermal adhesive layer) 3, and in which the base layer 7 and the intermediate layer 5 are bonded together by an adhesive layer 6, and the intermediate layer 5 and the sealant layer 3 are bonded together by an adhesive layer 4.

[0013] In the following description, examples of contents to be stored in the packaging bag 1 include food and seasonings that require long-term storage at room temperature, daily necessities such as detergents (solid, liquid, powdered or granular), cosmetics such as lotion and milky lotion, medicines, etc. Furthermore, objects that can be measured using the packaging bag 1 according to this embodiment are not limited to liquids such as water, hot water, milk, and fruit juice, but may also be fluid foods (curry, stew, soup, etc.), and powdered or granular materials such as salt and sugar.

[0014] As shown in Figs. 1 to 3, the packaging bag 1 according to the present embodiment is a self-supporting packaging bag (standing pouch) composed of sheet members (13, 14, 15) formed of a base film 2 having a multi-layer structure. The packaging bag 1 is constructed by sandwiching a bottom sheet member 15 constituting the bottom between a front sheet member 13 constituting the front surface of the body of the packaging bag and a back sheet member 14 constituting the back surface, and heat-sealing the periphery. For example, the sealant layers of the base film 2 constituting the front sheet member 13 and the back sheet member 14 face each other, and the bottom sheet member 15 is inserted in a state of being folded inward in two in an inverted V shape so that the sealant layer 3 of the bottom sheet member 15 is sandwiched between the facing sealant layers. As shown in Fig. 2, in the packaging bag 1 whose periphery is heat-sealed, a storage space S1 for storing contents is formed by the front sheet member 13, the back sheet member 14, and the bottom sheet member 15.

[0015] The front sheet member 13, the back sheet member 14, and the bottom sheet member 15 are terms used to conveniently distinguish the front, back, and bottom of the packaging bag 1. For this reason, for example, the front sheet member 13, the back sheet member 14, and the bottom sheet member 15 may each be a single sheet member, or the front sheet member 13, the back sheet member 14, and the bottom sheet member 15 may all be formed from a single sheet member. In this embodiment, as will be described later, the volume of the object to be weighed is measured using a predetermined area of ​​the storage space S1 formed in the packaging bag 1.

[0016] In the following description, the top 11 side of the packaging bag 1 is also referred to as the "upper side," and the bottom 12 side is also referred to as the "lower side." The direction in which the outer edge (bottom side) of the bottom 12 or the outer edge (top side) of the top 11 extends is also referred to as the "horizontal direction," and the direction perpendicular to the horizontal direction is also referred to as the "vertical direction." Thermal fusion is also referred to as "heat sealing."

[0017] As shown by diagonal hatching in Fig. 1, a pair of side seal portions (23, 24), a bottom seal portion 22, and a top seal portion 21 are formed in the heat-sealed packaging bag 1. The bottom seal portion 22 is formed on the bottom 12 side of the packaging bag 1, and the top seal portion 21 is formed on the top 11 side located opposite the bottom 12. As shown in Fig. 2, the pair of side seal portions (23, 24) are formed by overlapping the sealant layer 3 of the front sheet member 13 and the sealant layer 3 of the back sheet member 14 that face each other. The pair of side seal portions (23, 24) are formed on both lateral sides of the overlapped front sheet member 13 and back sheet member 14.

[0018] The bottom seal portion 22 is formed by the bottom sheet member 15, which is inserted in a folded state between the sealant layer 3 of the front sheet member 13 and the sealant layer 3 of the back sheet member 14. The top seal portion 21 is formed by overlapping the sealant layer 3 constituting the edge portion of the front sheet member 13 on the top portion 11 side with the sealant layer 3 constituting the edge portion of the back sheet member 14 on the top portion 11 side after the contents are accommodated. The bottom seal portion 22 and the top seal portion 21 are connected to a pair of side seal portions (23, 24). The seal width (vertical length) of the top seal portion 21 and the seal width (horizontal length) of each of the pair of side seal portions (23, 24) can be appropriately set so as to have a seal strength according to the size of the packaging bag 1, the type and amount of the contents, etc.

[0019] In FIG. 1, a form in which the shape in plan view as viewed from the front sheet member 13 is substantially rectangular is illustrated, but the shape in plan view of the packaging bag 1 may be trapezoidal or bell-shaped. The front sheet member 13 and the back sheet member 14, which form the body of the packaging bag 1, form a pair. In addition, in the form of FIG. 1, a pair of notches (16a, 16b) that are cutouts for opening the packaging bag 1 containing the contents are provided in a pair of side seal portions (23, 24). The notch 16a is provided on the top portion 11 side of the side seal portion 23, and the notch 16b is provided at opposing positions on the top portion 11 side of the side seal portion 24. Between the pair of notches, for example, an opening guide line 16 is formed parallel to the outer edge (bottom side) of the bottom portion 12 to smoothly open the unopened packaging bag 1. Such an opening guide line 16 is, for example, a half-cut line formed by laser processing or blade processing. In addition, when the unopened packaging bag 1 is provided with tearability in the opening direction, it is not necessary to provide the opening guide line 16. Furthermore, it may be limited to providing only one of the pair of notches (16a, 16b).

[0020] In the embodiment shown in FIG. 1, a fastener 17 for resealing the packaging bag 1 after it has been opened is provided between a pair of side seal portions (23, 24). The fastener 17 is provided below (toward the bottom portion 12) a position where the notches (16a, 16b) for opening the packaging bag 1 are provided, and parallel to the outer edge (bottom side) of the bottom portion 12. Providing the fastener 17 ensures the preservation of the contents contained in the packaging bag 1 after it has been opened. For example, after measuring the volume of the object to be weighed, it is possible to place unused solid seasoning or the like in the opened packaging bag 1 again and reseal the bag. The fastener 17 may be provided as appropriate depending on the type, physical properties, quantity, and whether or not the contents are individually wrapped to be contained in the packaging bag 1.

[0021] As shown in FIG. 1, in a form having a substantially rectangular shape in plan view, the vertical length L1 of the packaging bag 1 is preferably 100 mm to less than 200 mm, and the horizontal length L2 is preferably 100 mm to less than 180 mm. The handling property can be improved when the volume of the weighing object is measured using the packaging bag 1 after opening. In addition, the vertical length L3 from the bottom 12 of the bottom sheet member 15 inserted between the front sheet member 13 and the back sheet member 14 in the folded state is preferably 25 mm to less than 55 mm. The self-supporting property can be improved when the volume of the weighing object is measured using the packaging bag 1 after opening. In addition, the vertical length L4 from the top 11 to the position of the notches (16a, 16b) provided in the pair of side seal portions (23, 24) is preferably 10 mm to 15 mm or less.

[0022] The front sheet member 13, back sheet member 14 and bottom sheet member 15 constituting the packaging bag 1 are formed from a base film 2 which includes in its laminate a sealant layer 3, an intermediate layer 5 and a base layer 7. In the example of the schematic cross-sectional view shown in Fig. 3, the sealant layer 3 of each member constitutes the innermost layer (inner surface) of the packaging bag 1 in which the contents are contained, and the base layer 7 constitutes the outermost layer (outer surface).

[0023] The base material layer 7 preferably has mechanical strength and heat resistance to such an extent that it does not deform during heat sealing. In addition, since the base material layer 7 also serves as a printing base material on which a pattern, product description text, etc. are printed on the outer surface of the packaging bag 1, a synthetic resin film having printability is preferable. Examples of the base material layer 7 include a single material such as an oriented polyethylene terephthalate (PET) resin film, an oriented nylon film (ONy), or an oriented polypropylene (OPP) resin film, or a laminated film of two or more of these materials. In addition, the base material layer 7 may be a paper base material, a laminate of paper base materials, or a laminate of a resin film and a paper base material.

[0024] The sealant layer 3 is a heat-sealable layer having heat-sealing properties. Polyolefin resins are generally used for the sealant layer 3. Specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, Examples of the polypropylene resin include ethylene-based resins such as ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene resins (PP), propylene-ethylene random copolymers, propylene-ethylene block copolymers, and propylene-α-olefin copolymers.

[0025] The intermediate layer 5 is preferably an aluminum foil such as ALL6 or ALL7 having thermal conductivity, heat insulation, light blocking properties, impermeability to oxygen and water vapor, and moisture resistance so that the contents housed in the packaging bag 1 can be preserved for a long period at room temperature. The intermediate layer 5 may be a metal foil made of a metal such as aluminum or magnesium. The intermediate layer 5 may also be VM-PET, VM-OPP, VM-CPP, etc., which are PET film, OPP film, or non-oriented polypropylene film (CPP) that has been subjected to deposition of a metal such as aluminum.

[0026] The adhesive layers (4, 6) are layers formed of, for example, an adhesive. A general-purpose adhesive for dry lamination can be used as such an adhesive. Specific examples include liquid-curing urethane adhesives, polyester urethane adhesives, polyether urethane adhesives, acrylic adhesives, polyester adhesives, polyamide adhesives, and epoxy adhesives.

[0027] The layer structures of the laminates forming the front sheet member 13, the back sheet member 14, and the bottom sheet member 15 may be the same or different. For example, the front sheet member 13 and the back sheet member 14 may be formed of the same laminate, and the intermediate layer 5 of the bottom sheet member 15 may be composed of a different film material. Examples of the intermediate layer 5 of the bottom sheet member 15 include film materials obtained by vapor-depositing inorganic oxides such as aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, zirconium oxide, titanium oxide, boron oxide, hafnium oxide, and barium oxide onto a PET film or the like.

[0028] As described above, the packaging bag 1 according to the present embodiment is composed of a front sheet member 13, a back sheet member 14, and a bottom sheet member 15, with the sealant layer 3 of the base film 2 serving as the inner surface. When food or the like is contained in the packaging bag 1, the food comes into contact with the sealant layer 3, which is the inner surface of the base film 2. For this reason, for example, printing on the inner surface of the packaging bag 1 with which the food or the like comes into contact may be restricted as it is undesirable from the standpoint of the safety and quality of the contained food or the like. In addition, polyolefin resins such as LLDP used for the sealant layer 3, which is the inner surface of the base film 2, are easily stretched and have low heat resistance, making it difficult to print marked lines for measuring the volume of the object to be weighed at an accurate pitch.

[0029] When food, seasonings, medicines, etc. that require long-term storage at room temperature are contained in the packaging bag 1, aluminum foil, VM-PET, VM-OPP, VM-CPP, etc., which have thermal conductivity, heat insulation, light blocking properties, oxygen and water vapor impermeability, and moisture resistance, are used as the intermediate layer 5 of the base film 2. It is also possible to add a printing layer between the intermediate layer 5 of the base film 2 and the sealant layer 3, on which a marking line for measuring the volume of the object to be weighed can be printed, but adding such a printing layer would result in an increase in materials and costs.

[0030] In the packaging bag 1 according to this embodiment, at least one of the front sheet member 13 and the back sheet member 14 is provided with a guide line (guide line) for creating a fold on the inner surface of the packaging bag, which serves as a benchmark line for measuring the volume of an object to be weighed. The guide line for creating the fold is printed, for example, on the base material layer 7 of the base material film 2 constituting the outer surface of the back sheet member 14. A user who uses the opened packaging bag 1 to measure the volume of an object to be weighed folds the packaging bag 1 according to the guide line printed on the outer surface, and creates a fold on the inner surface of the packaging bag, which serves as a benchmark line for weighing. Then, the user uses the opened packaging bag to measure the volume of an object to be weighed, using the fold created on the inner surface of the packaging bag 1 as the benchmark line.

[0031] In this manner, in this embodiment, a marking line for measuring the volume of an object to be measured can be generated on the inner surface of the packaging bag 1 without printing on the inner surface of the base film 2 that contacts the food or the like contained in the packaging bag 1. Furthermore, even when foods, seasonings, medicines, or the like that require long-term storage at room temperature are contained in the packaging bag, no printed layer is added between the aluminum foil, VM-PET, VM-OPP, VM-CPP, or the like used as the intermediate layer 5 and the sealant layer 3. This embodiment provides a packaging bag technology that reduces materials and costs and enables the volume of an object to be easily measured.

[0032] Example 1 Next, the packaging bag 1 according to Example 1 will be described with reference to Fig. 4 to Fig. 6. Fig. 4 is a schematic plan view showing the packaging bag 1 according to Example 1. Fig. 4 illustrates a schematic plan view of the packaging bag 1 in an unopened state as viewed from the back sheet member 14. Fig. 5 is a diagram illustrating a procedure for creating folds on the inner side of the packaging bag 1, which will serve as benchmark lines for weighing, according to guide lines 18 and 19 provided on the back sheet member 14. Fig. 6 is a diagram illustrating the benchmark lines created on the inner side of the packaging bag 1.

[0033] Example 1 is a packaging bag 1 in which two guide lines (18, 19) are printed on the base material layer 7 of the base material film 2 constituting the outer surface of the back sheet member 14. In Example 1, the front sheet member 13, back sheet member 14, and bottom sheet member 15 constituting the packaging bag 1 are formed of the base material film 2 having the same layer structure. In this layer structure, the sealant layer 3 is made of linear low density polyethylene resin (LLDP), the intermediate layer 5 is made of aluminum foil (AL6), and the base material layer 7 is made of oriented polyethylene terephthalate resin (PET12).

[0034] Moreover, the external dimensions of the packaging bag 1 according to the first embodiment are as follows. Vertical length L1: 190mm Horizontal length L2: 140mm Vertical length L3: 41mm Vertical length L4: 15mm

[0035] As shown in Fig. 4, guide lines 18 are provided on the outer surface of the back sheet member 14 constituting the packaging bag 1 to generate folds that serve as marking lines for measuring the volume of the objects to be weighed on the inner surface of the packaging bag 1. The guide lines 18 are printed, for example, on the base material layer 7 that forms the outer surface of the packaging bag 1. The guide lines 18 are provided as straight guide lines that run between the side seal portions 23 and 24, parallel to the outer edge (bottom side) of the bottom portion 12. The position at which the guide lines 18 are provided on the packaging bag 1 can be appropriately set depending on the type, volume, etc. of the objects to be measured. In this embodiment, the guide lines 18 are an example of a "first guide line."

[0036] In addition, a guide line 19 is provided on the outer surface of the back sheet member 14 of the packaging bag 1 to generate a vertical fold between the top portion 11 and the bottom portion 12. The guide line 19 is printed, for example, on the base material layer 7 that becomes the outer surface of the packaging bag 1. The guide line 19 is provided as a straight guide line that crosses between the top portion 11 and the bottom portion 12 and is provided perpendicular to the outer edge (bottom side) of the bottom portion 12 at a position near the center in the horizontal direction. In the packaging bag 1 according to Example 1, by providing the guide line 19 and folding the packaging bag in the vertical direction, it is possible to generate a fold that improves the self-supporting property and opening property (ease of inserting and removing the weighing object) of the opened packaging bag 1. In this embodiment, the guide line 19 is an example of a "second guide line."

[0037] As shown in FIG. 4, the end of the guide line 19 on the top portion 11 side is provided below the position where a pair of notches (16a, 16b) for opening the packaging bag 1 are provided. When a fastener 17 for resealing the packaging bag 1 after opening is provided, The end of the guide line 19 on the top portion 11 side is provided below the fastener. This makes it possible to improve the visibility of the guide line 19 on the packaging bag 1 after it has been opened.

[0038] The line type, color scheme, etc. of the guide lines 18, 19 provided on the outer surface of the back sheet member 14 of the packaging bag 1 can be set appropriately. The line type, color scheme, etc. of each guide line may be printed the same, or the line type, color scheme, etc. of each guide line may be printed differently. Also, a message such as "Please fold here" or a folding guide map may be printed using a speech bubble or other box near the printing position of each guide line. This allows the user to clearly recognize the purpose of the guide lines 18, 19.

[0039] FIG. 5(a) illustrates the packaging bag 1 in an opened state, with the top seal portion 21 separated from the packaging bag 1 along a pair of notches (16a, 16b). On the outer surface of the back sheet member 14 of the packaging bag 1, a guide line 18 parallel to the outer edge (bottom side) of the bottom portion 12 and a guide line 19 perpendicular to the outer edge (bottom side) of the bottom portion 12 at a substantially central position in the horizontal direction are printed. The user folds the packaging bag 1 after opening, for example, according to a message or guide map printed near the guide line 18, and creates a crease on the inner surface of the packaging bag that will be a mark line for weighing. For example, as shown in FIG. 5(b), the user folds the packaging bag 1 in the direction of the band arrow Z1 around the guide line 18, and creates a crease on the inner surface that will be a mark line for weighing. The user also opens the folded packaging bag 1 and folds and folds the packaging bag 1 in the direction of the band arrow Z2 around the guide line 19, as shown in Figure 5 (c), creating a crease to improve the self-supporting and opening ability of the opened packaging bag 1.

[0040] Fig. 5(d) shows a top view of the packaging bag 1, which has been folded along the guide lines 18, 19, and opened and viewed from the top portion 11 side. As shown in Fig. 5(d), the packaging bag 1 in the opened state opens in a substantially diamond shape having a diagonal corner with the fold 19a generated along the guide lines 19 as a vertex and a diagonal corner with the pair of side seal portions (23, 24) as vertices. Similarly, the bottom sheet member 15 constituting the bottom portion 12 of the packaging bag 1 also spreads in a substantially diamond shape, improving the self-supporting property and opening property of the packaging bag 1 during weighing. The stability of the weighing space formed by the inner surface 13a of the front sheet member 13, the inner surface 14a of the back sheet member 14, and the inner surface 15a of the bottom sheet member 15 can be ensured.

[0041] Fig. 6 shows a perspective view of the packaging bag 1 folded along the guide lines 18, 19 and opened, as viewed from the top 11 side of the back sheet member 14. As shown in Fig. 6, on the inner surface 13a of the front sheet member 13, a fold 19a generated along the guide line 19 extends linearly in the vertical direction between the top 11 and the bottom 12. Similarly, as shown between the band arrows Z3 and Z4, on the inner surface 13a of the front sheet member 13, a fold 18a generated along the guide line 18 extends linearly in the horizontal direction. Note that on the inner surface 14a of the back sheet member 14, a fold 19a generated along the guide line 19 extends linearly in the vertical direction between the top 11 and the bottom 12, and a fold 18a generated along the guide line 18 extends linearly in the horizontal direction.

[0042] In this way, in the packaging bag 1 according to Example 1, folding is performed along guide line 18 provided on the outer surface of back sheet member 14, thereby creating fold line 18a extending linearly in the horizontal direction on the inner surface of the packaging bag, which serves as a benchmark line for weighing. Also, folding is performed along guide line 19 provided on the outer surface of back sheet member 14, thereby creating fold line 19a extending linearly in the vertical direction to improve the self-supporting ability and openability of packaging bag 1 when weighing.

[0043] When an aluminum foil or a resin film on which a metal such as aluminum is vapor-deposited is used as the intermediate layer 5 of the base film 2 constituting the packaging bag 1, the This is more preferable because the creases 18a, 19a created thereby become clearly identifiable.

[0044] Example 2 Next, referring to FIG. 7, the packaging bag 1 according to Example 2 will be described. FIG. 7 is a schematic plan view showing the packaging bag 1 according to Example 2. FIG. 7 illustrates a schematic plan view of the packaging bag 1 in an unopened state as viewed from the back sheet member 14. The layer structure of the base film 2 of the packaging bag 1 in Example 2 is the same as that of Example 1, and the front sheet member 13, the back sheet member 14, and the bottom sheet member 15 are formed of the same laminate. The dimensions of the outer shape of the packaging bag 1 according to Example 2 are the same as those of Example 1. In the packaging bag 1 according to Example 2, a group of guide lines is provided on the inner surface of the packaging bag 1 to generate folds that serve as marking lines for measuring the volume of the weighing object. In Example 2 as well, the group of guide lines is printed, for example, on the base layer 7 that covers the outer surface of the packaging bag 1.

[0045] In the packaging bag 1 according to Example 2, four guide lines (19, 25, 26, 27) are printed on the base material layer 7 of the base material film 2 that forms the outer surface of the backsheet member 14. The guide lines 19 printed on the base material layer 7 are the same as those in Example 1, and therefore will not be described.

[0046] As shown in Fig. 7, in Example 2, a plurality of guide lines (guide lines 25, 26, 27) are provided on the outer surface of the back sheet member 14 constituting the packaging bag 1 to generate folds that serve as benchmark lines for measuring the volume of the objects to be weighed on the inner surface of the packaging bag 1. Note that, although three guide lines (25, 26, 27) are illustrated in Fig. 7, two guide lines or more than three guide lines may be provided. The plurality of guide lines (25, 26, 27) form a guide line group, which may be set as appropriate depending on the type, purpose, etc. of the objects to be measured.

[0047] By providing multiple guide lines, it becomes possible to increase or decrease the volume of the object to be weighed when using the packaging bag 1 to weigh it. For example, it is possible to increase or decrease the amount of water added when cooking ingredients using the solid seasoning contained in the packaging bag 1. This makes it possible to provide weighing according to the user's preferences, such as "strong seasoning," "standard seasoning recommended by the manufacturer," or "light seasoning." This makes it possible to provide more precise weighing measurements that meet the needs of the user who uses the packaging bag 1 to weigh the object to be weighed.

[0048] In Fig. 7, guide line 25 is a guide line (guide line) for creating a fold that serves as a first benchmark for measuring the volume of an object to be weighed relatively larger than a standard volume. Guide line 25 is provided as a straight guide line that crosses between side seal portion 23 and side seal portion 24, parallel to the outer edge (bottom side) of bottom portion 12, and positioned higher in the vertical direction. Guide line 27 is a guide line for creating a fold that serves as a third benchmark for measuring the volume of an object to be weighed relatively smaller than a standard volume. Guide line 27 is provided as a straight guide line that crosses between side seal portion 23 and side seal portion 24, parallel to the outer edge (bottom side) of bottom portion 12, and positioned lower in the vertical direction.

[0049] Guide line 26 is a guide line for generating a fold that serves as a second benchmark for measuring the volume (standard amount) of a standard measurement object. Here, the standard amount is a reference value for measuring the volume of the measurement object, and is, for example, a standard recommended by a manufacturing company that provides packaging bag 1. For example, if the measurement object is water and the recommended measurement value is 300 ml, the amount of water measured by guide line 25 is 400 ml, and the amount of water measured by guide line 27 is 200 ml. The standard amount can be set appropriately depending on the type, purpose, etc. of the measurement object.

[0050] The guide line 26 is a straight guide line that crosses between the side seal portion 23 and the side seal portion 24, and is parallel to the outer edge (bottom side) of the bottom portion 12, and is between the vertical guide lines 25 and 27. That is, in the packaging bag 1 of Example 2, guide line 25 is provided so as to be located at the top of the outer surface of the backsheet member 14 in the vertical direction, and guide line 27 is provided so as to be located at the bottom. Then, guide line 26 is provided so as to be located below guide line 25 and above guide line 27 in the vertical direction.

[0051] The user selects a guide line that allows the desired volume to be measured from among the guide lines 25, 26, and 27 that are provided in parallel with the vertical direction of the back sheet member 14. Then, as explained in FIG. 5, the user folds the opened packaging bag 1 along the selected guide line, and creates a crease on the inner surface of the packaging bag that serves as a mark line for measuring. As explained in FIG. 5 and FIG. 6, when the guide line 25 is selected and folding is performed, for example, the crease 25a generated along the guide line 25 extends linearly in the horizontal direction on the inner surface 13a of the front sheet member 13 and the inner surface 14a of the back sheet member 14. The same applies when the guide lines 26 and 27 are selected, and the creases 26a and 27a generated along the respective guide lines extend linearly in the horizontal direction on the inner surface 13a of the front sheet member 13 and the inner surface 14a of the back sheet member 14.

[0052] The line type, color scheme, etc. of the guide lines 25, 26, 27 provided on the outer surface of the back sheet member 14 of the packaging bag 1 according to the second embodiment may be set appropriately. The line type, color scheme, etc. of each guide line may be printed to be the same, or the line type, color scheme, etc. of each guide line may be printed to be different. For example, the guide line 26 indicating the standard amount may be printed in black, the guide line 25 indicating a measurement value relatively larger than the standard amount may be printed in red, and the guide line 27 indicating a measurement value relatively smaller than the standard amount may be printed in blue, so that they can be distinguished by different color schemes. Also, the guide line 26 indicating the standard amount may be distinguished by different line types, such as a solid line, and the guide lines 25 and 27 indicating measurement values ​​different from the standard amount may be distinguished by dashed lines, or a combination of the line types and color schemes described above may be used for distinction. Also, a message such as "Please fold here" or a folding guide map may be printed near the printing position of each guide line in combination with the measurement value, such as more, standard, or less, specified by each guide line, using a speech bubble, etc. [Explanation of symbols]

[0053] 1 packaging bag, 2 base film, 3 sealant layer, 4, 6 adhesive layer, 5 middle layer, 7 base layer, 11 top portion, 12 bottom portion, 13 front sheet member, 14 back sheet member, 15 bottom sheet member, 16 opening guide line, 16a, 16b notch, 17 fastener, 18, 19, 25, 26, 27 guide lines, 21 top seal portion, 22 bottom seal portion, 23, 24 side seal portion

Claims

1. A self-supporting packaging bag formed by heat-sealing the periphery of a front sheet, a back sheet, and a bottom sheet constituting a bottom portion, with a base layer of a base film as an outer surface and a heat-sealing layer of the base film as an inner surface, the packaging bag comprising: a seal portion that bonds the front sheet, the back sheet, and the bottom sheet together in a bag shape; A first guide line for generating a fold that serves as a marking line for measuring the volume of a weighing object on an inner surface of the packaging bag is provided on an outer surface of the front sheet or the back sheet, the first guide line being parallel to an outer edge of the bottom. packaging bag.

2. 2. The packaging bag according to claim 1, wherein a second guide line is provided on the outer surface of the front sheet or the back sheet, the second guide line being perpendicular to the first guide line and near the center of the front sheet or the back sheet, for creating a fold that serves as a marking line on the inner surface of the packaging bag to maintain self-supporting and openability when opened.

3. 3. The packaging bag according to claim 1 or 2, wherein a plurality of guide lines are provided on the outer surface of the front sheet or the back sheet, the guide lines being parallel to the outer edge of the bottom, for creating folds that serve as benchmark lines for measuring the volume of an object to be weighed on the inner surface of the packaging bag.

4. The packaging bag according to claim 1 , wherein the base film has an intermediate layer including aluminum foil bonded between the base layer and the heat-sealing layer via an adhesive layer.

5. The packaging bag according to claim 1 or 2, wherein the base layer comprises a paper base material, a laminate of paper base materials, or a laminate of a resin film and a paper base material.

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