Packaging bags

Abstract

To provide a packaging bag easy to open, by allowing easy opening of a tearing line in cutting along an opening guiding line with low resistance, and allowing fingers of a user to easily pick up an opening after opened.SOLUTION: A packaging bag has a front side sheet and a rear side sheet. The front side sheet has a first main guiding line, a second main guiding line and auxiliary guiding lines. The rear side sheet has a third main guiding line. The auxiliary guiding lines include a first auxiliary guiding line and a second auxiliary guiding line obliquely extended in relation to a second direction to direct the second direction from the first main guiding line to the second main guiding line, when directing from a first seal part to a second seal part, and a third auxiliary guiding line obliquely extended in relation to the second direction to direct to the first main guiding line from the second main guiding line when directing from the first seal part to the second seal part, connecting the first main guiding line to the second main guiding line, and crossing the first auxiliary guiding line and the second auxiliary guiding line.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to packaging pouches. [Background technology]

[0002] Patent Documents 1 and 2 disclose packaging bags configured to hermetically store contents (e.g., food, cosmetics, medicines, etc.) inside. The packaging bag includes a heat-sealed portion where the peripheral edges of a pair of sheets are heat-sealed. The pair of sheets are provided with an opening guide line that extends across the pair of side edges. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-037979 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-240074 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure describes a packaging bag that allows for easy opening by allowing the tear line to easily proceed along the opening guide line with low resistance during cutting and making it easy for the user to grasp the opening with their fingers after opening. [Means for solving the problem]

[0005] An example of a packaging bag includes a front sheet and a back sheet including a pair of first and second side edges extending along a first direction, a first seal portion configured to seal the front sheet and the back sheet at the first side edges when the front sheet and the back sheet are overlapped with each other, and a second seal portion configured to seal the front sheet and the back sheet at the second side edges when the front sheet and the back sheet are overlapped with each other. The front sheet is provided with first and second main guide lines that extend along a second direction intersecting the first direction between the first and second seal portions and are arranged side by side in the first direction, and a group of auxiliary guide lines that are located near the first seal portion and are located between the first and second main guide lines in the first direction. The back sheet is provided with a third main guide wire that extends along the second direction between the first seal portion and the second seal portion and is located between the first main guide wire and the second main guide wire when viewed from the stacking direction of the front sheet and the back sheet. The group of auxiliary induction wires includes: a first auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire to the second main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire; a second auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire to the second main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire, and is located closer to the second seal portion than the first auxiliary induction wire; and a third auxiliary induction wire that extends obliquely with respect to the second direction from the second main induction wire to the first main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire, and intersects with the first auxiliary induction wire and the second auxiliary induction wire. [Effects of the Invention]

[0006] According to the packaging bag of the present disclosure, the tear line during cutting easily progresses along the opening guide line with low resistance, and the opening can be easily grasped with the user's fingers after opening, making it possible to easily open the bag. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view showing an example of a packaging bag. [Figure 2] FIG. 2 is a rear view of the packaging bag of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] 4 is an enlarged view showing the vicinity of the opening guide line in the packaging bag of FIG. [Figure 5] FIG. 5 is an enlarged view of part V in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a diagram for explaining how the tear line progresses during cutting in the group of auxiliary guide lines of the packaging bag of FIG. [Figure 8] FIG. 8 is an enlarged view showing a group of auxiliary guide lines in another example of a packaging bag. DETAILED DESCRIPTION OF THE INVENTION

[0008] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and duplicated explanations will be omitted. In this specification, when referring to the top, bottom, right, and left of the figure, reference will be made to the orientation of the reference numerals in the figure. However, in Figure 2, the packaging bag 1 is viewed from the back side, so the left and right are reversed.

[0009] [Packaging bag composition] First, the structure of a packaging bag 1 will be described with reference to Figures 1 to 3. The packaging bag 1 comprises a front sheet 2, a back sheet 3, and a resealer 4.

[0010] The front sheet 2 is a flexible, substantially rectangular sheet. As illustrated in FIG. 1, the front sheet 2 includes an upper edge 2T, a lower edge 2B, a left edge 2L (first side edge), and a right edge 2R (second side edge). The upper edge 2T and the lower edge 2B both extend in the left-right direction (second direction, X direction) and face each other in the up-down direction (first direction, Y direction) perpendicular to the left-right direction. The left edge 2L and the right edge 2R both extend in the up-down direction and face each other in the left-right direction. A group of front guide wires 20 is provided on the surface of the front sheet 2 in an area close to the upper edge 2T (described in detail later). The front sheet 2 may have a thickness of, for example, about 50 μm to 200 μm.

[0011] The back-side sheet 3 is a flexible, substantially rectangular sheet. As illustrated in FIG. 2, the back-side sheet 3 includes an upper edge 3T, a lower edge 3B, a left edge 3L (first side edge), and a right edge 3R (second side edge). The upper edge 3T and the lower edge 3B both extend in the left-right direction and face each other in the up-down direction. The left edge 3L and the right edge 3R both extend in the up-down direction and face each other in the left-right direction. A group of back-side guide wires 30 is provided on the surface of the back-side sheet 3 in an area close to the upper edge 3T (described in detail later). The back-side sheet 3 may have a thickness of, for example, about 50 μm to 200 μm.

[0012] As illustrated in Fig. 3, the front sheet 2 and the back sheet 3 are formed by laminating a base material layer 10, an intermediate layer 11, and a sealant layer 12 in this order from the outside to the inside of the packaging bag 1. The base material layer 10, the intermediate layer 11, and the sealant layer 12 may be bonded to each other via an adhesive (not shown). The laminate structure of the front sheet 2 and the back sheet 3 is not limited to the form illustrated in Fig. 3, and layers made of various materials can be used depending on the type of contents, the required level of airtightness, etc.

[0013] For example, a plastic film, paper, or nonwoven fabric can be used as the base layer 10. Examples of plastic films include polyester film, polypropylene (PP) film, polystyrene film, nylon film, polycarbonate film, polyethylene terephthalate (PET) film, polyacrylonitrile film, and polyimide film. As long as the plastic film exhibits predetermined mechanical strength and dimensional stability, there are no particular limitations on the material, composition, manufacturing method, etc.

[0014] For example, the plastic film may be a uniaxially stretched film, a biaxially stretched film, or an unstretched film (also called a non-oriented film). When a stretched film is used, the orientation of the resin molecules constituting the film tends to follow a predetermined direction, so the extension direction of the main guide lines M1 to M3 is aligned with the orientation direction of the film, making it easy to tear the packaging bag 1. Furthermore, when an unstretched film is used, tearing tends to proceed in any direction within the film plane, making it easy to tear the packaging bag 1 regardless of the extension direction of the main guide lines M1 to M3.

[0015] A vapor-deposited layer of a metal such as aluminum may be formed on the surface of the plastic film. Examples of paper include fine paper, single-sided art paper, coated paper, cast-coated paper, and construction paper. The type of paper used for the base layer 10 may be determined based on the mechanical strength and suitability for bag making. One of the above-mentioned films may be used alone, or two or more may be used in combination.

[0016] The intermediate layer 11 is disposed, for example, for the purpose of improving various physical properties of the front sheet 2 and the back sheet 3. Examples of such physical properties include rigidity, drop strength, puncture strength, gas (e.g., water vapor, oxygen gas, etc.) barrier properties, and cosmetic properties. To improve rigidity, drop strength, puncture strength, etc., the intermediate layer 11 may be formed of, for example, a nylon film or a polyester film. To improve water vapor barrier properties, the intermediate layer 11 may be formed of, for example, an aluminum foil, an aluminum-vapor-deposited polyester film, or an inorganic oxide-vapor-deposited polyester film. The inorganic oxide may be, for example, an oxide of a metal such as silicon oxide, aluminum oxide, magnesium oxide, calcium oxide, potassium oxide, tin oxide, sodium oxide, boron oxide, titanium oxide, lead oxide, zirconium oxide, or yttrium oxide. Among these, silicon oxide, aluminum oxide, magnesium oxide, or the like may be selected as the inorganic oxide in consideration of productivity and cost. To improve cosmetic properties, the intermediate layer 11 may be formed of, for example, a polyester film having an aluminum-vapor-deposited layer.

[0017] The sealant layer 12 is configured to melt when heated and fuse to another sheet. That is, the sealant layer 12 is configured to be heat-sealable. The sealant layer 12 may be configured, for example, of a polyolefin-based resin. Specific examples of polyolefin-based resins include low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer (EVA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EAA), ionomer, and polypropylene. When the above-mentioned resin is used as the material for the sealant layer 12, the sealant layer 12 is configured by molding the resin into a film using an extruder. The sealant layer 12 may be a single layer or multiple layers.

[0018] The adhesive may be, for example, a dry lamination adhesive. Examples of types of adhesive include two-component curing urethane adhesives, polyester urethane adhesives, polyether urethane adhesives, acrylic adhesives, polyester adhesives, polyamide adhesives, and epoxy adhesives. When a dry lamination adhesive is used as the adhesive, the two layers may be bonded together by a dry lamination method.

[0019] The packaging bag 1 is constructed by overlapping a front sheet 2 and a back sheet 3 with their sealant layers 12 facing each other, and then heat-sealing the peripheral edge of the front sheet 2 with the peripheral edge of the back sheet 3. That is, as illustrated in Figures 1 and 2, a sealed portion 5 is provided at the peripheral edge of the packaging bag 1. A storage space V for storing an item is formed in the non-heat-sealed area between the front sheet 2 and the back sheet 3 (see Figure 3).

[0020] The seal portion 5 includes an upper seal portion 5T, a lower seal portion 5B, a left seal portion 5L (first seal portion), and a right seal portion 5R (second seal portion). The upper seal portion 5T has a predetermined width and extends along the upper edges 2T and 3T between the upper ends of the right edges 2R and 3R and the upper ends of the left edges 2L and 3L. The lower seal portion 5B has a predetermined width and extends along the lower edges 2B and 3B between the lower ends of the right edges 2R and 3R and the lower ends of the left edges 2L and 3L. The left seal portion 5L has a predetermined width and extends along the left edges 2L and 3L between the left ends of the upper edges 2T and 3T and the left ends of the lower edges 2B and 3B. The right seal portion 5R has a predetermined width and extends along the right edges 2R and 3R between the right ends of the upper edges 2T and 3T and the right ends of the lower edges 2B and 3B.

[0021] The left and right sealed portions 5L and 5R are provided with tear initiation portions 6L and 6R, respectively. The tear initiation portions 6L and 6R serve to smoothly guide the tear line being cut toward the main guide lines M1 to M3 as tearing of the packaging bag 1 begins from these portions. In the example shown in FIGS. 1 and 2, the tear initiation portions 6L and 6R are a group of scars formed by numerous tiny through-holes penetrating the front sheet 2 and the back sheet 3. Other examples of the tear initiation portions 6L and 6R may include a home-base-shaped (scalene pentagonal) notch, an I-shaped notch, or a V-shaped notch. Another example of the tear initiation portions 6R and 6L may be an easy-open portion (thin portion) formed by removing layers outside the sealant layer 12 from the front sheet 2 and the back sheet 3 in a predetermined region. The tear initiation portions 6L and 6R may be located at approximately the same height in the up-down direction.

[0022] The resealer 4 has the function of repeatedly resealing and reopening the packaging bag 1 after it has been opened. The resealer 4 may adopt various known structures as appropriate. The resealer 4 may be, for example, a synthetic resin zipper that can repeatedly seal by fitting a strip-shaped protrusion into a strip-shaped groove, or an adhesive seal. The resealer 4 is located near the main guide lines M1 to M3 and on the lower seal part 5B side of the main guide lines M1 to M3. The resealer 4 extends in the left-right direction.

[0023] [Details of the front and back guide lines] Here, the front side guide wire group 20 and the back side guide wire group 30 will be described in detail with reference to FIGS.

[0024] As illustrated in FIGS. 1 and 4, the front-side induction wire group 20 includes a main induction wire 21 (first main induction wire), a main induction wire 22 (second main induction wire), an auxiliary induction wire group 23, and an auxiliary induction wire group 24 (another auxiliary induction wire group).

[0025] As shown in FIG. 3, the main guide lines 21 and 22 are grooves that extend from the front base material layer 10 to the intermediate layer 11 and do not completely cut the front sheet 2, and are also called half-cut lines. The main guide lines 21 and 22 may be formed, for example, with a cutting tool such as a Thomson blade, or by laser processing. When formed by laser processing, grooves of a more uniform depth can be obtained. The laser beam may be, for example, a continuous wave (CW) laser or a pulsed laser. The type of laser may be, for example, a carbon dioxide laser.

[0026] The main guide wires 21, 22 extend in the left-right direction on the surface of the front sheet 2 between the left seal portion 5L and the right seal portion 5R. The main guide wires 21, 22 may be linear. The main guide wires 21, 22 are arranged to be aligned in the up-down direction. In the example shown in Figs. 1 and 4, the main guide wire 21 is located closer to the upper seal portion 5T than the main guide wire 22.

[0027] 1 and 4, the main guide lines 21, 22 may extend in the left-right direction on the surface of the top sheet 2 from the left edge 2L, 3L or its vicinity to the right edge 2R, 3R or its vicinity. That is, the left ends of the main guide lines 21, 22 may reach the left edge 2L, 3L, or may be located more inward than the left edge 2L, 3L in the left-right direction. The right ends of the main guide lines 21, 22 may reach the right edge 2R, 3R, or may be located more inward than the right edge 2R, 3R in the left-right direction.

[0028] The auxiliary induction wire group 23 and the auxiliary induction wire group 24 are located between the main induction wires 21 and 22 in the up-down direction. The auxiliary induction wire group 23 is located inside the left seal portion 5L and in the vicinity of the left seal portion 5L in the left-right direction. The auxiliary induction wire group 24 is located inside the right seal portion 5R and in the vicinity of the right seal portion 5R in the left-right direction. The auxiliary induction wire group 23 and the auxiliary induction wire group 24 may be formed in the same manner as the main induction wires 21 and 22.

[0029] As illustrated in FIGS. 4 and 5, the auxiliary induction wire group 23 includes an auxiliary induction wire 23A (first auxiliary induction wire), an auxiliary induction wire 23B (second auxiliary induction wire), and an auxiliary induction wire 23C (third auxiliary induction wire).

[0030] The auxiliary induction wire 23A extends obliquely with respect to the left-right direction from the main induction wire 21 to the main induction wire 22 as it moves from the left seal portion 5L to the right seal portion 5R. The auxiliary induction wire 23A may be linear. As illustrated in FIG. 5 , one end of the auxiliary induction wire 23A is connected to the main induction wire 21 at an intersection P1. The other end of the auxiliary induction wire 23A is connected to the main induction wire 22 at an intersection P2. That is, the auxiliary induction wire 23A connects the main induction wire 21 and the main induction wire 22.

[0031] As illustrated in FIGS. 4 and 5 , the auxiliary induction wire 23B extends obliquely with respect to the left-right direction, from the main induction wire 21 to the main induction wire 22 as it moves from the left seal portion 5L to the right seal portion 5R. The auxiliary induction wire 23A may be linear. As illustrated in FIG. 5 , one end of the auxiliary induction wire 23B is connected to the main induction wire 21 at an intersection P3. The intersection P3 is located closer to the left seal portion 5L than the intersection P1. The other end of the auxiliary induction wire 23B is connected to the main induction wire 22 at an intersection P4. The intersection P4 is located closer to the left seal portion 5L than the intersection P2. In other words, the auxiliary induction wire 23A connects the main induction wire 21 and the main induction wire 22 so as to be located closer to the right seal portion 5R than the auxiliary induction wire 23A.

[0032] As illustrated in FIGS. 4 and 5 , the auxiliary induction line 23C extends obliquely with respect to the left-right direction, from the main induction line 22 to the main induction line 21 as it moves from the left seal portion 5L to the right seal portion 5R. The auxiliary induction line 23C may be linear. As illustrated in FIG. 5 , one end of the auxiliary induction line 23C is connected to the main induction line 22 at an intersection P5. The intersection P5 is located closer to the left seal portion 5L than the intersections P2 and P4. The other end of the auxiliary induction line 23C is connected to the main induction line 22 at an intersection P6. The intersection P6 is located closer to the right seal portion 5R than the intersections P1 and P3. That is, the auxiliary induction line 23A connects the main induction line 21 and the main induction line 22 so as to intersect with the auxiliary induction lines 23A and 23B.

[0033] 5, when viewed from the stacking direction in which the front sheet 2 and the back sheet 3 are superimposed (hereinafter referred to as the stacking direction), the intersection Q1 between the auxiliary guide lines 23A and 23C may be located closer to the lower seal portion 5B than the main guide line 31 described below. When viewed from the stacking direction, the intersection Q2 between the auxiliary guide lines 23B and 23C may be located closer to the upper seal portion 5T than the main guide line 31 described below. In other words, when viewed from the stacking direction, the intersection Q1 and the intersection Q2 may be located on different sides across the main guide line 31.

[0034] 5 and 6, at the intersection Q1, the auxiliary guide wire 23A may be divided by the auxiliary guide wire 23C. That is, at the intersection Q1, a wall portion W1 (first wall portion) dividing the auxiliary guide wire 23A may be provided on both sides of the auxiliary guide wire 23C.

[0035] The wall portion W1 may be formed, for example, by separately half-cutting with a blade a portion of the auxiliary guide line 23A closer to the main guide line 21 than the intersection point Q1 and a portion of the auxiliary guide line 23A closer to the main guide line 22 than the intersection point Q1. The wall portion W1 may be formed, for example, by first laser-processing the auxiliary guide line 23A and then laser-processing the auxiliary guide line 23C so that it passes through the auxiliary guide line 23A. In the case of laser processing, a groove is formed while the base layer 10 is burned away by the laser beam, so that forming the auxiliary guide line 23C after the auxiliary guide line 23A causes bulges on both sides of the auxiliary guide line 23C at the intersection point Q1, thereby generating the wall portion W1.

[0036] 5, at the intersection Q2, the auxiliary guide wire 23C may be divided by the auxiliary guide wire 23B. That is, at the intersection Q2, a wall portion W2 (second wall portion) dividing the auxiliary guide wire 23C may be provided on both sides of the auxiliary guide wire 23B. The wall portion W2 may be formed in the same manner as the wall portion W1.

[0037] 4, the auxiliary induction line group 24 includes an auxiliary induction line 24A (fourth auxiliary induction line), an auxiliary induction line 24B (fifth auxiliary induction line), and an auxiliary induction line 24C (sixth auxiliary induction line). The auxiliary induction line group 24 may be symmetrical with the auxiliary induction line group 23 about a virtual axis extending in the up-down direction. In this case, the auxiliary induction line 24A corresponds to the auxiliary induction line 23A, the auxiliary induction line 24B corresponds to the auxiliary induction line 23B, and the auxiliary induction line 24C corresponds to the auxiliary induction line 23C. Therefore, details of the auxiliary induction line group 24 will be omitted.

[0038] As illustrated in FIGS. 2 and 4, the rear-side guide wire group 30 includes a main guide wire 31 (third main guide wire), a restriction guide wire group 32, and a restriction guide wire group 33.

[0039] 3, the main guide wire 31 is a groove that extends from the front base material layer 10 to the intermediate layer 11, and is also called a half-cut line because it does not completely cut the front sheet 2. The main guide wire 31 may be formed by the same method as the main guide wires 21 and 22.

[0040] 2 and 4, the main guide wire 31 extends in the left-right direction on the surface of the back sheet 3 between the left seal portion 5L and the right seal portion 5R. The main guide wire 31 may be linear. When viewed from the stacking direction, the main guide wire 31 is located between the main guide wires 21 and 22 in the up-down direction.

[0041] The left end of the main induction wire 31 may overlap with the auxiliary induction wire group 23 when viewed from the stacking direction. That is, as illustrated in Fig. 5, the left end of the main induction wire 31 may be located closer to the left seal portion 5L than the intersection Q2, or may be located closer to the left seal portion 5L than the intersection Q1. The right end of the main induction wire 31 may overlap with the auxiliary induction wire group 24 when viewed from the stacking direction, as illustrated in Figs. 2 and 4. That is, the right end of the main induction wire 31 may be located closer to the right seal portion 5R than the intersection between the auxiliary induction wires 24A and 24C.

[0042] 2 and 4, the restriction guide line group 32 is located closer to the left seal portion 5L than the left end of the main guide line 31. The restriction guide line group 32 may be formed in the same manner as the main guide lines 21 and 22. The restriction guide line group 32 includes a restriction guide line 32A (first restriction guide line) and a restriction guide line 32B (second restriction guide line).

[0043] The restricting guide lines 32A and 32B extend to surround the tear initiation portion 6L when viewed from the stacking direction. The restricting guide line 32A is located closer to the upper seal portion 5T than the restricting guide line 32B in the up-down direction. The restricting guide lines 32A and 32B may extend along the left-right direction on the surface of the back sheet 3, for example, from the left edge 2L or its vicinity to the left end of the main guide line 31 or its vicinity. That is, the left ends of the restricting guide lines 32A and 32B may reach the left edges 2L and 3L, or may be located inside the left edges 2L and 3L in the left-right direction. The right ends of the restricting guide lines 32A and 32B may reach the left end of the main guide line 31, or may be located near the periphery of the left end of the main guide line 31 in the left-right direction.

[0044] The restriction guide lines 32A, 32B may include, for example, portions that extend so as to approach each other as they move from the left seal portion 5L toward the right seal portion 5R. The restriction guide lines 32A, 32B may, for example, extend while bending or curving, or may extend linearly.

[0045] As illustrated in FIGS. 2 and 4, the restriction guide line group 33 is located closer to the right seal portion 5R than the right end of the main guide line 31. The restriction guide line group 33 may be formed in the same manner as the main guide lines 21 and 22. The restriction guide line group 33 includes a restriction guide line 33A and a restriction guide line 33B. The restriction guide line group 33 may be symmetrical with the restriction guide line group 32 with respect to a virtual axis extending in the up-down direction. In this case, the restriction guide line 33A corresponds to the restriction guide line 32A, and the restriction guide line 33B corresponds to the restriction guide line 32B. Therefore, details of the restriction guide line group 33 will be omitted.

[0046] [How to open the packaging bag] Next, a method for opening the packaging bag 1 will be described with reference to Figures 4 and 7. When opening the packaging bag 1 by pushing and tearing, for example, a right-handed user holds the main body of the packaging bag 1 in the left hand, pinches the upper left part with the right hand, and pushes the right hand away from the body. On the other hand, when opening the packaging bag 1 by pulling and tearing, for example, a right-handed user holds the main body of the packaging bag 1 in the left hand, pinches the upper left part with the right hand, and pulls the right hand toward the body.

[0047] 4 and 7, the left end of the main guide line 31 is located closer to the left seal portion 5L than the intersection Q1, so that in the back sheet 3, the back tear line reaches the restrictive guide line 32A or 32B, travels along the restrictive guide line 32A or 32B and the main guide line 31, and then reaches the right edges 2R and 3R.

[0048] In the front sheet 2, the front tear line reaches the auxiliary guide line 23A or 23C, travels along the auxiliary guide line 23A or 23C, and then reaches the intersection Q1. When viewed from the stacking direction, the intersection Q1 is located below the main guide line 31 in the vertical direction. Therefore, during push-cutting, a fragment of the front sheet 2 above the intersection Q1 contacts a portion of the back sheet 3 below the main guide line 31. This results in a relatively large resistance acting on the fragment being torn away from the packaging bag 1. Therefore, the front tear line tends to travel along the auxiliary guide line 23C toward the intersection Q2 (see arrow Ar1 in FIG. 7(a)). At this time, because walls W1 are present on both sides of the auxiliary guide line 23C at the intersection Q1, the front tear line is more likely to travel along the auxiliary guide line 23C.

[0049] On the other hand, when the packaging bag 1 is being pulled torn, the fragment of the front sheet 2 above the intersection point Q1 does not come into contact with the portion of the back sheet 3 below the main guide line 31. In addition, a downward force is likely to act on the fragment that is being separated from the packaging bag 1 by the pull-tear. Therefore, although some resistance occurs at the wall W1, the front tear line tends to pass over the wall W1 and proceed along the auxiliary guide line 23A (see arrow Ar2 in FIG. 7(a)). The front tear line then reaches the main guide line 22, travels along the main guide line 22, and reaches the right edges 2R and 3R. This causes the packaging bag 1 to be opened, and a step is formed between the front tear line corresponding to the main guide line 22 and the back tear line corresponding to the main guide line 31.

[0050] In contrast, the case where the front tear line reaches intersection Q2 will be described. Here, when viewed from the stacking direction, intersection Q2 is located above main guide line 31 in the vertical direction. Therefore, when the packaging bag 1 is being pushed to cut, the fragment of the back sheet 3 above main guide line 31 does not come into contact with the portion of the front sheet 2 below intersection Q2. Additionally, an upward force is likely to act on the fragment that is being separated from the packaging bag 1 by the pushing and cutting. Therefore, although some resistance occurs at wall W2, the front tear line tends to move beyond wall W2 and along auxiliary guide line 23C (see arrow Ar3 in FIG. 7(b)). The front tear line then reaches main guide line 21, travels along main guide line 21, and reaches the right edges 2R and 3R. This causes the packaging bag 1 to be opened, and a step is formed between the front tear line corresponding to main guide line 21 and the back tear line corresponding to main guide line 31. It's in that direction.

[0051] On the other hand, when tearing, a fragment of the back sheet 3 above the main guide line 31 comes into contact with a portion of the front sheet 2 below the intersection Q2. This results in a relatively large resistance acting on the fragment as it separates from the packaging bag 1. Therefore, the front tear line tends to move along the auxiliary guide line 23B toward the main guide line 22 (see arrow Ar4 in FIG. 7(b)). At this time, because walls W2 exist on both sides of the auxiliary guide line 23B at the intersection Q2, the front tear line tends to move more easily along the auxiliary guide line 23B. The front tear line then reaches the main guide line 22, travels along the main guide line 22, and reaches the right edges 2R and 3R. This causes the packaging bag 1 to be opened, creating a step between the front tear line corresponding to the main guide line 22 and the back tear line corresponding to the main guide line 31.

[0052] [Effect] According to the above example, when the front tear line reaches each intersection, the front tear line tends to move along the guide line where the resistance acting on the fragments becomes smaller in accordance with the resistance acting on the fragments that are being separated from the packaging bag by tearing. This allows the user to open the packaging bag 1 with a light force. Furthermore, after opening the packaging bag 1, a step is created at the opening, making it easier for the user to grasp the opening with their fingers. This makes it possible to easily open the opening.

[0053] According to the above example, after the front tear line reaches main guide line 21 or main guide line 22, it travels on main guide line 21 or main guide line 22. Similarly, after the back tear line reaches main guide line 31, it travels on main guide line 31. Therefore, the opening is linear along the main guide line, and it is possible to provide a packaging bag 1 with an opening that has an excellent appearance after opening.

[0054] According to the above example, the left end of the main guide wire 31 may overlap the auxiliary guide wire group 23 when viewed from the stacking direction. In this case, the back-side tear line is guided along the main guide wire 31 approximately simultaneously with or before the front-side tear line is guided along the guide wire of the auxiliary guide wire group 23. Therefore, when the front-side tear line reaches each intersection Q1 or Q2, it tends to proceed along a guide line that provides less resistance to the fragments, based on the back-side tear line corresponding to the main guide wire 31. In other words, there is a single criterion for determining which guide line the front-side tear line will follow after reaching each intersection Q1 or Q2. Therefore, when the front-side tear line passes through each intersection Q1 or Q2 and proceeds along a specific guide line, it is less likely that the back-side tear line will suddenly sway up and down, causing interference between the tear portion caused by the front-side tear line and the tear portion caused by the back-side tear line, resulting in increased resistance to the fragments. As a result, the user can open the packaging bag 1 with less force.

[0055] According to the above example, at intersection Q1, a wall portion W1 may be provided on both sides of auxiliary guide line 23A to separate auxiliary guide line 23A. Furthermore, at intersection Q2, a wall portion W2 may be provided on both sides of auxiliary guide line 23B to separate auxiliary guide line 23C. In this case, the front-side tear line tends to advance along the side of the guide line that is not separated by walls W1 and W2. Therefore, as the front-side tear line passes through each intersection Q1 and Q2, it is prevented from accidentally advancing toward the guide line where the resistance acting on the fragments is greater. This allows the user to open the packaging bag 1 with less force.

[0056] According to the above example, the auxiliary guide wire group 24 configured similarly to the auxiliary guide wire group 23 may be located between the main guide wires 21 and 22 in the vertical direction and in the vicinity of the right seal portion 5R. In this case, the auxiliary guide wire groups 23 and 24 are present on both sides of the packaging bag 1. Therefore, regardless of whether the packaging bag 1 is opened from the left seal portion 5L or the right seal portion 5R, the opening of the opening can be easily performed.

[0057] According to the above example, when viewed from the stacking direction, intersections Q1 and Q2 may be located on different sides of the main guide line 31. In this case, depending on the progression of the front tear line, the tear portions caused by the front tear line and the back tear line may exert large or small resistance on the fragments at each intersection Q1 and Q2. This prevents the front tear line from accidentally progressing toward the guide line where the resistance acting on the fragments is large when the front tear line passes through each intersection Q1 and Q2. This allows the user to open the packaging bag 1 with less force.

[0058] According to the above example, the tear initiation portion 6L may be provided in the left seal portion 5L. In this case, the tear initiation portion 6L makes it possible to start tearing the packaging bag 1 easily with a light force.

[0059] According to the above example, the restricting guide wires 32A, 32B extend to surround the tear initiation portion 6L when viewed from the stacking direction, and may include portions that extend closer to each other from the left seal portion 5L toward the right seal portion 5R. In this case, by starting tearing from the tear initiation portion 6L, the backside tear line can be smoothly guided to the main guide wire 31.

[0060] [Variations] The disclosure in this specification should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

[0061] (1) The front guide wire group 20 may include at least one of the auxiliary guide wire groups 23 and 24.

[0062] (2) The auxiliary guidance line group 23 may be configured with four or more auxiliary guidance lines. When the auxiliary guidance line group 23 is configured with four or more auxiliary guidance lines, the auxiliary guidance lines may extend obliquely between the main guidance lines 21 and 22 so that intersections Q1 and Q2 are formed by the three auxiliary guidance lines positioned innermost in the left-right direction. Similarly, the auxiliary guidance line group 24 may be configured with four or more auxiliary guidance lines.

[0063] (3) At the intersection Q1, a wall W1 may be provided on both sides of the auxiliary guide wire 23A to separate the auxiliary guide wire 23CDC. At the intersection Q2, a wall W2 may be provided on both sides of the auxiliary guide wire 23C to separate the auxiliary guide wire 23B. The walls W1 and W2 may not be provided.

[0064] (3) As shown in Figure 8, the intersections Q1 and Q2 may overlap the main guide line 31 when viewed in the stacking direction. In this case, when the front tear line travels between the intersections Q1 and Q2, the front tear line and the back tear line travel along each guide line while overlapping each other, thereby reducing the resistance acting on the fragments. This allows the user to open the packaging bag 1 with less force.

[0065] (4) The front sheet 2 and the back sheet 3 may be made of a film that has linear cutting properties in a predetermined cutting direction. For example, they may be a resin film that has orientation in one predetermined direction (e.g., a type of uniaxially oriented film), or a resin film that has orientation in another direction that is significantly different from the predetermined direction (e.g., a type of biaxially oriented film). When the front sheet 2 and the back sheet 3 are made of a film that has linear cutting properties in the predetermined cutting direction, the main guide lines 21, 22, and 31 may extend along the linear cutting direction of the film. In this case, tear lines generated in the front sheet 2 and the back sheet 3 by tearing are less likely to deviate from the main guide lines. Therefore, the opening opening is linear along the main guide lines, making it easier to tear the packaging bag 1 and stabilizing the tear direction.

[0066] [Other examples] Example 1. An example of a packaging bag includes a front sheet and a back sheet including a pair of first and second side edges extending along a first direction, a first seal portion configured to seal the front sheet and the back sheet at the first side edges when the front sheet and the back sheet are overlapped with each other, and a second seal portion configured to seal the front sheet and the back sheet at the second side edges when the front sheet and the back sheet are overlapped with each other. The front sheet is provided with first and second main guide lines that extend along a second direction intersecting the first direction between the first and second seal portions and are arranged side by side in the first direction, and a group of auxiliary guide lines that are located near the first seal portion and are located between the first and second main guide lines in the first direction. The back sheet is provided with a third main guide wire that extends along the second direction between the first seal portion and the second seal portion and is located between the first main guide wire and the second main guide wire when viewed from the stacking direction of the front sheet and the back sheet. The group of auxiliary induction wires includes: a first auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire to the second main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire; a second auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire to the second main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire, and is located closer to the second seal portion than the first auxiliary induction wire; and a third auxiliary induction wire that extends obliquely with respect to the second direction from the second main induction wire to the first main induction wire as it moves from the first seal portion to the second seal portion, and connects the first main induction wire and the second main induction wire, and intersects with the first auxiliary induction wire and the second auxiliary induction wire.

[0067] In this case, for example, if tearing of the packaging bag is started from the first sealed portion side, and the tear line in the front sheet (hereinafter also referred to as the "front tear line") reaches the intersection of the first auxiliary guide line and the third auxiliary guide line, the front tear line will be guided along either the first auxiliary guide line or the third auxiliary guide line depending on the resistance acting on the fragments being separated from the packaging bag by tearing. When the front tear line is guided along the first auxiliary guide line, it will reach the second main guide line and tend to continue along the second main guide line. On the other hand, the tear line in the back sheet (hereinafter also referred to as the "back tear line") will tend to progress along the third main guide line, which is located between the first and second main guide lines when viewed in the stacking direction of the front and back sheets. As a result, a step will be created between the front tear line corresponding to the second main guide line and the back tear line corresponding to the third main guide line.

[0068] When the front-side tear line is guided along the third auxiliary guide line, it reaches the intersection of the second and third auxiliary guide lines. Even when the front-side tear line reaches this intersection, it is guided along either the first auxiliary guide line or the third auxiliary guide line depending on the resistance acting on the fragment. When the front-side tear line is guided along the second auxiliary guide line, it reaches the second main guide line and tends to continue along the second main guide line. On the other hand, the back-side tear line tends to continue along the third main guide line. As a result, a step is created between the front-side tear line corresponding to the second main guide line and the back-side tear line corresponding to the third main guide line.

[0069] In contrast, when the front tear line is guided along the third auxiliary guide line, the front tear line reaches the first main guide line and tends to continue along the first main guide line. On the other hand, the back tear line tends to progress along the third main guide line. As a result, a step is created between the front tear line corresponding to the first main guide line and the back tear line corresponding to the third main guide line.

[0070] As described above, when the front tear line reaches each intersection, it tends to move along the guide line, which reduces the resistance acting on the fragments. This allows the user to open the packaging bag with less force. Furthermore, after opening the packaging bag, a step is created at the opening, making it easier for the user to grasp the opening with their fingers. This makes it easier to open the opening.

[0071] Example 2: In the packaging bag of Example 1, the third main guide line may overlap with the group of auxiliary guide lines when viewed in the stacking direction of the front and back sheets. In this case, the back tear line is guided along the third main guide line approximately simultaneously with or before the front tear line is guided along the guide line of the group of auxiliary guide lines. Therefore, when the front tear line reaches each intersection, it tends to proceed along the guide line that offers the least resistance to the fragments, based on the back tear line corresponding to the third main guide line. In other words, there is a single standard for which guide line the front tear line will follow after reaching each intersection. Therefore, when the front tear line passes each intersection and proceeds along a specific guide line, it is less likely that the back tear line will suddenly move up and down, causing interference between the tear portion caused by the front tear line and the tear portion caused by the back tear line, resulting in increased resistance to the fragments. As a result, the user can open the packaging bag with less force.

[0072] Example 3: In the packaging bag of Example 1 or Example 2, a first wall may be provided between the first and third auxiliary guide lines at the intersection of the first and third auxiliary guide lines to divide the third auxiliary guide line, and a second wall may be provided between the second and third auxiliary guide lines to divide the second auxiliary guide line, or a first wall may be provided between the first and third auxiliary guide lines at the intersection of the first and third auxiliary guide lines to divide the first auxiliary guide line, and a second wall may be provided between the second and third auxiliary guide lines to divide the third auxiliary guide line, at the intersection of the second and third auxiliary guide lines. In this case, the front tear line is more likely to progress along the guide line that is not divided by the wall. Therefore, when the front tear line passes through each intersection, it is prevented from accidentally moving toward the guide line where the resistance acting on the fragments is greater, allowing the user to open the packaging bag with less force.

[0073] Example 4 In the packaging bag of any of Examples 1 to 3, another group of auxiliary guide lines is provided on the front sheet, located near the second sealed portion and located between the first main guide line and the second main guide line in the first direction, and the other group of auxiliary guide lines extends obliquely with respect to the second direction so as to extend from the first main guide line to the second main guide line as it moves from the second sealed portion to the first sealed portion, and includes a fourth auxiliary guide line connecting the first main guide line and the second main guide line, and a fourth auxiliary guide line extending from the second sealed portion to the first sealed portion as it moves from the second sealed portion to the first sealed portion. The packaging bag may further include a fifth auxiliary guide line extending obliquely with respect to the second direction from the first main guide line toward the second main guide line, connecting the first and second main guide lines and positioned closer to the first sealed portion than the fourth auxiliary guide line, and a sixth auxiliary guide line extending obliquely with respect to the second direction from the second main guide line toward the first main guide line as it moves from the second sealed portion to the first sealed portion, connecting the first and second main guide lines and intersecting the fourth and fifth auxiliary guide lines. In this case, the auxiliary guide line group and another auxiliary guide line group are present on both sides of the packaging bag. Therefore, the effects of the packaging bag of Example 1 can be obtained regardless of whether the packaging bag is opened from the first sealed portion or the second sealed portion.

[0074] Example 5: In the packaging bag of any of Examples 1 to 4, the intersection of the first auxiliary guide line and the third auxiliary guide line and the intersection of the second auxiliary guide line and the third auxiliary guide line may be located on different sides of the third main guide line when viewed from the stacking direction of the front and back sheets. In this case, depending on the progression of the front tear line, the tear portions caused by the front tear line and the back tear line may act as large or small resistance on the fragments at each intersection. Therefore, when the front tear line passes through each intersection, it is prevented from accidentally progressing toward the guide line that acts as a large resistance on the fragments. This allows the user to open the packaging bag with less force.

[0075] Example 6: In the packaging bag of any of Examples 1 to 4, the intersection of the first auxiliary guide line and the third auxiliary guide line and the intersection of the second auxiliary guide line and the third auxiliary guide line may be substantially overlapped with the third main guide line when viewed from the stacking direction of the front and back sheets. In this case, as the front tear line advances between the intersections, the front tear line and the back tear line advance along the guide line while substantially overlapping, thereby reducing the resistance acting on the fragments. This allows the user to open the packaging bag with less force.

[0076] Example 7. In the packaging bag of any of Examples 1 to 6, a tear initiation portion is provided in the first sealed portion, and the back sheet is provided with a first restricting guide line extending from an end of the third main guide line on the first sealed portion side or near that end toward the first sealed portion, and a second restricting guide line extending from an end of the third main guide line on the first sealed portion side or near that end toward the first sealed portion, the first restricting guide line and the second restricting guide line extending toward the first sealed portion, the first restricting guide line and the second restricting guide line extending toward each other from the first sealed portion toward the second sealed portion, and the tear initiation portion may be located in an area surrounded by the first restricting guide line and the second restricting guide line. In this case, the tear initiation portion makes it possible to easily start tearing the packaging bag with a light force. In addition, the tear initiation portion is located in the area surrounded by the first and second restrictive guide lines, and the first and second restrictive guide lines extend so as to approach each other as they move from the first sealed portion to the second sealed portion.Therefore, by starting tearing from the tear initiation portion, it is possible to smoothly guide the back tear line to the third main guide line.

[0077] Example 8 In the packaging bag of any one of Examples 1 to 7, the front sheet and the back sheet may be made of a uniaxially stretched film, a biaxially stretched film, or an unstretched film.

[0078] Example 9: In the packaging bag of any of Examples 1 to 8, the front sheet and the back sheet are made of a film that can be cut in a straight line in a predetermined cutting direction, and the first main guide line, the second main guide line, and the third main guide line may extend along the cutting direction. In this case, tear lines generated in the front sheet and the back sheet by tearing are less likely to deviate from the main guide lines. Therefore, the opening opening is linear along the main guide lines, making it easier to tear the packaging bag and stabilizing the tear direction. [Explanation of symbols]

[0079] 1...packaging bag, 2...front sheet, 2L...left edge (first side edge), 2R...right edge (second side edge), 3...back sheet, 3L...left edge (first side edge), 3R...right edge (second side edge), 5L...left seal portion (first seal portion), 5R...right seal portion (second seal portion), 6L, 6R...tear start portion, 20...front guide line group, 21...main guide line (first main guide line), 22...main guide line (second main guide line), 23...auxiliary guide line group, 23A...auxiliary guide line (first auxiliary guide line), 23B...auxiliary guide line (second auxiliary guide line), 23C...auxiliary induction line (third auxiliary induction line), 24...auxiliary induction line group (another auxiliary induction line group), 24A...auxiliary induction line (fourth auxiliary induction line), 24B...auxiliary induction line (fifth auxiliary induction line), 24C...auxiliary induction line (sixth auxiliary induction line), 30...rear side induction line group, 31...main induction line (third main induction line), 32...restrictive induction line group, 32A...restrictive induction line (first restrictive induction line), 32B...restrictive induction line (second restrictive induction line), 33...restrictive induction line group, Q1, Q2...intersection, W1...wall portion (first wall portion), W2...wall portion (second wall portion).

Claims

1. a front sheet and a back sheet including a pair of first and second side edges extending along a first direction; a first sealing portion configured to seal the front sheet and the back sheet at the first side edge when the front sheet and the back sheet are overlapped with each other; a second sealing portion configured to seal the front sheet and the back sheet at the second side edge when the front sheet and the back sheet are overlapped with each other; The front sheet has a first main induction wire and a second main induction wire extending along a second direction intersecting the first direction between the first seal portion and the second seal portion and arranged to be aligned in the first direction; a group of auxiliary induction wires located in the vicinity of the first seal portion and located between the first main induction wire and the second main induction wire in the first direction, the back-side sheet is provided with only one third main induction wire as a main induction wire that extends along the second direction between the first sealed portion and the second sealed portion and is located between the first main induction wire and the second main induction wire when viewed from the stacking direction of the front-side sheet and the back-side sheet, The auxiliary guidance wire group includes: a first auxiliary induction wire extending obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the first seal portion toward the second seal portion, and connecting the first main induction wire and the second main induction wire; a second auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the first seal portion toward the second seal portion, connects the first main induction wire and the second main induction wire, and is located closer to the second seal portion than the first auxiliary induction wire; a third auxiliary induction line extending obliquely with respect to the second direction so as to extend from the second main induction line toward the first main induction line as the third auxiliary induction line extends from the first seal portion toward the second seal portion, connects the first main induction line and the second main induction line, and intersects with the first auxiliary induction line and the second auxiliary induction line; the first main induction wire, the second main induction wire, and the group of auxiliary induction wires are half-cut lines formed by partially cutting the front-side sheet in its thickness direction on the outer surface of the front-side sheet, The packaging bag, wherein the third main guide line is a half-cut line along which the back sheet is partially cut in the thickness direction on the outer surface of the back sheet.

2. a first wall portion is provided between the first auxiliary induction line and the third auxiliary induction line at an intersection of the first auxiliary induction line and the third auxiliary induction line, the first wall portion dividing the third auxiliary induction line, and a second wall portion is provided between the second auxiliary induction line and the third auxiliary induction line at an intersection of the second auxiliary induction line and the third auxiliary induction line, the second wall portion dividing the second auxiliary induction line, or 2. The packaging bag according to claim 1, wherein a first wall portion is provided between the first auxiliary guide line and the third auxiliary guide line at an intersection of the first auxiliary guide line and the third auxiliary guide line, the first wall portion dividing the first auxiliary guide line, and a second wall portion is provided between the second auxiliary guide line and the third auxiliary guide line at an intersection of the second auxiliary guide line and the third auxiliary guide line, the second wall portion dividing the third auxiliary guide line.

3. A front sheet and a back sheet including a pair of first and second side edges extending along a first direction; a first sealing portion configured to seal the front sheet and the back sheet at the first side edge when the front sheet and the back sheet are overlapped with each other; a second sealing portion configured to seal the front sheet and the back sheet at the second side edge when the front sheet and the back sheet are overlapped with each other; The front sheet has a first main induction wire and a second main induction wire extending along a second direction intersecting the first direction between the first seal portion and the second seal portion and arranged to be aligned in the first direction; a group of auxiliary induction wires located in the vicinity of the first seal portion and located between the first main induction wire and the second main induction wire in the first direction, the back-side sheet is provided with a third main guide wire that extends along the second direction between the first sealed portion and the second sealed portion and is located between the first main guide wire and the second main guide wire when viewed from the stacking direction of the front-side sheet and the back-side sheet, The auxiliary guidance wire group includes: a first auxiliary induction wire extending obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the first seal portion toward the second seal portion, and connecting the first main induction wire and the second main induction wire; a second auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the first seal portion toward the second seal portion, connects the first main induction wire and the second main induction wire, and is located closer to the second seal portion than the first auxiliary induction wire; a third auxiliary induction line extending obliquely with respect to the second direction so as to extend from the second main induction line toward the first main induction line as the third auxiliary induction line extends from the first seal portion toward the second seal portion, connects the first main induction line and the second main induction line, and intersects with the first auxiliary induction line and the second auxiliary induction line; the first main induction wire, the second main induction wire, and the group of auxiliary induction wires are half-cut lines formed by partially cutting the front-side sheet in its thickness direction on the outer surface of the front-side sheet, the third main guide line is a half-cut line formed by partially cutting the back sheet in the thickness direction on the outer surface of the back sheet, a first wall portion is provided between the first auxiliary induction line and the third auxiliary induction line at an intersection of the first auxiliary induction line and the third auxiliary induction line, the first wall portion dividing the third auxiliary induction line, and a second wall portion is provided between the second auxiliary induction line and the third auxiliary induction line at an intersection of the second auxiliary induction line and the third auxiliary induction line, the second wall portion dividing the second auxiliary induction line, or a first wall portion separating the first auxiliary guide line from the third auxiliary guide line is provided at an intersection of the first auxiliary guide line and the third auxiliary guide line, and a second wall portion separating the third auxiliary guide line from the second auxiliary guide line is provided at an intersection of the second auxiliary guide line and the third auxiliary guide line.

4. The packaging bag according to any one of claims 1 to 3, wherein the third main guide line overlaps with the group of auxiliary guide lines when viewed from the stacking direction of the front sheet and the back sheet.

5. the front sheet is provided with another group of auxiliary guide lines that are located in the vicinity of the second seal portion and between the first main guide lines and the second main guide lines in the first direction, The other auxiliary guidance wire group includes: a fourth auxiliary induction wire extending obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the second seal portion toward the first seal portion, and connecting the first main induction wire and the second main induction wire; a fifth auxiliary induction wire that extends obliquely with respect to the second direction from the first main induction wire toward the second main induction wire as it moves from the second seal portion toward the first seal portion, connects the first main induction wire and the second main induction wire, and is located closer to the first seal portion than the fourth auxiliary induction wire; a sixth auxiliary induction line that extends obliquely with respect to the second direction so as to extend from the second main induction line toward the first main induction line as it moves from the second seal portion toward the first seal portion, connects the first main induction line and the second main induction line, and intersects with the fourth auxiliary induction line and the fifth auxiliary induction line; The packaging bag according to any one of claims 1 to 4, wherein the other group of auxiliary guide lines are half-cut lines formed by partially cutting the front sheet in the thickness direction on the outer surface of the front sheet.

6. The packaging bag according to any one of claims 1 to 5, wherein an intersection of the first auxiliary guide line and the third auxiliary guide line and an intersection of the second auxiliary guide line and the third auxiliary guide line are located on different sides across the third main guide line when viewed from the stacking direction of the front-side sheet and the back-side sheet.

7. The packaging bag according to any one of claims 1 to 5, wherein an intersection of the first auxiliary guide line and the third auxiliary guide line and an intersection of the second auxiliary guide line and the third auxiliary guide line substantially overlap with the third main guide line when viewed from the stacking direction of the front sheet and the back sheet.

8. The first sealed portion is provided with a tear initiation portion, The back sheet has a first restricting guide wire extending from an end of the third main guide wire on the first seal portion side or from the vicinity of the end toward the first seal portion; a second restricting guide wire is provided, the second restricting guide wire extending from an end of the third main guide wire on the first seal portion side or from the vicinity of the end of the third main guide wire toward the first seal portion side, the first restriction guide line and the second restriction guide line extend so as to approach each other as they move from the first seal portion toward the second seal portion, The tear start portion is located in an area surrounded by the first restricting guide line and the second restricting guide line, The packaging bag according to any one of claims 1 to 7, wherein the first restrictive guide line and the second restrictive guide line are half-cut lines formed by partially cutting the back sheet in the thickness direction on the outer surface of the back sheet.

9. The packaging bag according to any one of claims 1 to 8, wherein the front sheet and the back sheet are made of a uniaxially stretched film, a biaxially stretched film, or an unstretched film.

10. The front sheet and the back sheet are made of a film having linear cutting properties in a predetermined cutting direction, The packaging bag according to any one of claims 1 to 9, wherein the first main guide wire, the second main guide wire, and the third main guide wire extend along the cutting direction.

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