Packaging bag

Abstract

The present invention provides a packaging bag that has excellent hand tearability along a half-cut line, and pourability after opening. More specifically, in a packaging bag 20 according to the present invention, an assisting line 27 for starting opening is formed on one side, in a width direction, of a flow passage 25 of a spout 24, and the assisting line 27 is linked to or close to a notch for starting opening in a region that extends from a base side of the spout 24 toward a tip side of the same. A half-cut line is formed so as to be connected to or close to the notch and cross the flow passage 25. An opening starting direction (direction from a starting point 30) in which the half-cut line extends from the notch is at an angle (angle minimum line 14) of 15° or greater relative to a machine direction (angle reference line 13) and below the machine direction. The angle formed by the machine direction and the opening starting direction is smaller than the value (angle maximum line 15) that results from adding 30° to the angle formed by the machine direction and the direction of a perpendicular line (perpendicular line 12 through the starting point 30) that is perpendicular to a spout center line.

Description

Packaging bag

[0001] The present invention relates to a packaging bag.

[0002] In a packaging bag for pouring out contents such as liquid, a pouring outlet is sometimes provided on the laminated film forming the packaging bag to facilitate pouring. For example, Patent Document 1 discusses, in a packaging bag using biaxially oriented nylon (ON), polyethylene terephthalate (PET) film or the like as a base film, the position where a cut line formed by a half-cut line is provided in order to facilitate opening of the pouring outlet.

[0003] Japanese Patent No. 4268255

[0004] Regarding the collection of plastic containers and packaging after use, packaging bags containing two or more types of resin have the problem that recycling as plastic containers and packaging is difficult. In recent years, in order to facilitate recycling, monomaterial containers and packaging using a single resin have been proposed. Even for conventional containers and packaging with ON base materials and PET base materials, there is a demand for packaging bags excellent in hand cuttability along the half-cut line and pourability after opening.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a packaging bag excellent in hand cuttability along the half-cut line and pourability after opening.

[0006] To solve the above problems, the present invention has the following configuration: [1] A packaging bag formed from a laminated film, the packaging bag having a body member formed from the laminated film including a storage section for storing contents and a spout for dispensing contents, on the surface including the body member, when the transverse direction (TD) perpendicular to the mechanical direction (MD) of the body member is defined as the vertical direction, the spout is positioned above the storage section, the spout includes a flow path surrounded by the body member and a sealing section formed by the sealing of the body member on at least one side in the width direction of the flow path and on the tip side of the flow path, an auxiliary line for initiating opening is formed on the sealing section on one side in the width direction of the flow path, including a portion that penetrates the body member in the thickness direction, the auxiliary line is connected to or close to a notch for initiating opening in a spout extension region extending from the base side to the tip side of the spout, a half-cut line is formed on the body member surrounding the flow path, connected to or close to the notch, so as to cross the flow path, and the spout When the spout centerline is defined midway between the boundary lines on both sides in the width direction of the flow path, the spout centerline is positioned in an upward-sloping direction different from the machine direction and the lateral direction, and on the surface including the body member, among the perpendiculars to the spout centerline, the perpendicular that touches the auxiliary line at the tip side of the spout extension region is defined as the spout tip perpendicular, and the perpendicular that touches the auxiliary line at the base side of the spout extension region is defined as the spout base perpendicular, and the spout tip perpendicular and the spout A packaging bag wherein, when a center perpendicular of the spout is defined at an equidistant distance from the perpendicular of the spout base, the notch is above the center line of the spout and located in a region above the center perpendicular of the spout, the opening initiation direction from which the half-cut line extends from the notch is below the machine direction and at an angle of 15° or more from the machine direction, and the angle between the machine direction and the opening initiation direction is less than the angle between the machine direction and the direction of the perpendicular to the spout center line plus 30°. [2] The packaging bag according to [1], wherein the angle between the machine direction and the opening initiation direction is less than 60°. [3] The packaging bag according to [1] or [2], wherein the laminated film is a monomaterial of polyolefin resin.[4] The packaging bag according to any one of [1] to [3], wherein the body member comprises a polyolefin resin film uniaxially stretched in the machine direction. [5] The packaging bag according to any one of [1] to [4], wherein the contents comprise a liquid. [6] The packaging bag according to any one of [1] to [5], wherein the packaging bag is a standing pouch comprising a bottom member joined to the body member below the storage portion.

[0007] According to the present invention, it is possible to provide a packaging bag that is easy to tear by hand along the half-cut line and has excellent pouring properties after opening.

[0008] This is a plan view showing an example of a packaging bag. This is a partially enlarged front view illustrating the range of the opening start direction. This is a partially enlarged front view illustrating the range of the notch. This is a partially enlarged front view showing the spout of Comparative Example 1 (0°). This is a partially enlarged front view showing the spout of Comparative Example 2 (10°). This is a partially enlarged front view showing the spout of Example 1 (15°). This is a partially enlarged front view showing the spout of Example 2 (30°). This is a partially enlarged front view showing the spout of Example 3 (45°). This is a partially enlarged front view showing the spout of Example 4 (50°). This is a partially enlarged front view showing the spout of Comparative Example 3 (60°). This is a partially enlarged front view showing the spout of Comparative Example 4 (90°).

[0009] The present invention will be described below based on preferred embodiments. Note that the dimensional ratios and angles in the drawings are exaggerated for illustrative purposes and may differ from actual dimensional ratios and angles.

[0010] Figure 1 is a plan view showing an example of a packaging bag 20. Figure 2 is a partially enlarged front view illustrating the range of the opening start direction. Figure 3 is a partially enlarged front view illustrating the range of the notch. Note that the notch and half-cut line are not shown in Figures 1 to 3. The specific arrangement of the notch 31 and half-cut line 32 will be illustrated in the specific examples described later (Figures 4 to 11).

[0011] The packaging bag of this embodiment is a packaging bag formed from a laminated film. As shown in Figure 1, the body member 21 of the packaging bag 20 includes a storage section 20a for containing the contents and a spout 24 for dispensing the contents. The body member 21 of the packaging bag 20 is formed from a laminated film, as described above. The contents can be dispensed from the storage section 20a through the spout 24. The contents may include a liquid.

[0012] In this specification, on the surface including the body member 21, the transverse direction (TD) perpendicular to the mechanical direction (MD) of the body member 21 is defined as the vertical direction. In the drawings, the MD direction is the left-right direction in Figure 1, and the TD direction is the vertical direction in Figure 1. In this case, the spout 24 is positioned above the housing portion 20a. Preferably, the body member 21 contains a polyolefin resin film that is uniaxially stretched in the MD direction.

[0013] The illustrated packaging bag 20 is a standing pouch that includes a bottom member 22 joined to the body member 21 at the lower side of the storage section 20a. In this case, the spout 24 is formed on the side of the body member 21 opposite to the side on which the bottom member 22 is located, in the vertical direction. If the packaging bag 20 does not have a bottom member 22, the side on which the spout 24 is located may be considered the upper side, and the side opposite to the spout 24 may be considered the lower side, in the vertical direction of the body member 21.

[0014] The spout 24 includes a flow path 25 surrounded by a body member 21, and a sealing portion on at least one side in the width direction of the flow path 25 and on the tip side of the flow path 25. In the illustrated example, the spout 24 has flow path forming sealing portions 25a and 25b on both sides in the width direction of the flow path 25, and a flow path sealing sealing portion 25c on the tip side of the flow path 25. However, if a sealing portion is provided on at least one side in the width direction of the flow path 25, it may be either a flow path forming sealing portion 25a or 25b. Both the flow path forming sealing portions 25a and 25b and the flow path sealing sealing portion 25c are formed by the sealing of two body members 21, front and rear. Note that "width direction of the flow path" means the direction perpendicular to the direction in which the contents such as liquid are poured from the storage portion 20a through the flow path 25 (spout 24), and "tip side of the flow path" means the side of the flow path that faces the storage portion 20a.

[0015] In the illustrated example, the boundary lines 25p and 25q on both sides in the width direction of the flow path 25 are defined by the boundary between the flow path forming seal portions 25a and 25b and the flow path 25. Although not specifically shown, a flow path forming seal portion may be provided on the side where the notch 31 is formed, and the boundary line of the flow path 25 may be formed on the opposite side by the fold line of the body member 21. When the fold line of the body member 21 is aligned with the MD direction of the body member 21, a fold line is formed at the upper end of the packaging bag 20, and the flow path forming seal portion 25b and the notch 31 are formed on the side of the packaging bag 20.

[0016] In the illustrated example, an auxiliary line 27 for initiating opening is formed on one side of the widthwise sealing portion of the flow path 25 (the flow path forming sealing portion 25a in the illustrated example). The auxiliary line 27 may penetrate the body member 21 in the thickness direction from the opening initiation portion 26 to the periphery of the tongue-shaped portion 28, except for one or more non-penetrating portions 27a, 27b. When the non-penetrating portions 27a, 27b are broken, the auxiliary line 27 may curve from the base side of the spout 24 toward the tip side of 24, forming the tongue-shaped portion 28.

[0017] The auxiliary line 27 is connected to or close to the opening start notch 31 in the spout extension region, which extends along the tongue-shaped portion 28 from the base side of the spout 24 towards the tip side of the spout 24. The spout extension region is located between the flow path 25 and the tongue-shaped portion 28. Furthermore, a half-cut line 32 is formed on the body member 21, connecting to or close to the notch 31 and traversing the flow path 25. The distance in the case of proximity is not particularly limited, but for example, it may be 1 mm or less.

[0018] The auxiliary line 27, notch 31, and half-cut line 32 are not particularly limited, but can all be formed by processing with a cutting tool or laser. If a flow channel forming seal portion 25a is not formed at the upper end of the packaging bag 20, and a flow channel forming seal portion 25b and a notch 31 are formed on the side of the packaging bag 20, the auxiliary line 27 may be formed on the flow channel forming seal portion 25b.

[0019] As mentioned above, the notch 31 and the half-cut line 32 are not shown in Figures 1 to 3, but the position where the half-cut line 32 starts from the notch 31 is shown as the starting point 30 in Figures 2 and 3.

[0020] The half-cut line 32 is formed on at least one of the pair of body members 21. For example, the half-cut line 32 may be formed at the same position on both body members 21 on the surface including the body members 21. In the thickness direction of the body member 21, the half-cut line 32 is formed only on a portion of the thickness without penetrating the body member 21 in the thickness direction. For example, the half-cut line 32 may be formed only on the outer surface of the body member 21 so as not to reach the inner surface of the body member 21.

[0021] In this embodiment, as shown in Figures 2 and 3, the spout centerline 11 is defined midway between the boundary lines 25p and 25q of the flow path 25. When the two boundary lines 25p and 25q intersect, the spout centerline 11 is the bisector extending along the flow path 25 from the intersection point. If the two boundary lines 25p and 25q are parallel, the spout centerline 11 is set at a position equidistant from the boundary lines 25p and 25q.

[0022] In this embodiment, the spout centerline 11 is positioned in an upward-sloping direction, different from the MD and TD directions. Furthermore, on the surface including the body member 21 (the plane of paper in Figure 3), among the perpendiculars to the spout centerline 11, the perpendicular that touches the auxiliary line 27 at the tip side of the auxiliary line 27 is defined as the spout tip side perpendicular 12a, and the perpendicular that touches the auxiliary line 27 at the base side of the auxiliary line 27 is defined as the spout base side perpendicular 12b. In addition, the spout center perpendicular 12c is defined at an equidistant distance from the spout tip side perpendicular 12a and the spout base side perpendicular 12b.

[0023] Furthermore, the range in which the perpendicular line 12a on the tip side of the spout and the perpendicular line 12b on the base side of the spout touch the auxiliary line 27 is limited to the range in the spout extension region described above in which the auxiliary line 27 extends from the base side to the tip side of the spout 24. For example, a region in which the auxiliary line 27 extends in a direction different from the direction from the base side to the tip side of the spout 24, such as the region near the opening start section 26, is not considered when setting the perpendicular line 12a on the tip side of the spout and the perpendicular line 12b on the base side of the spout.

[0024] In this embodiment, the notch 31 is located above the spout centerline 11 and above the spout center perpendicular 12c. In the example shown in Figure 3, the starting point 30 of the notch 31 and the half-cut line 32 are located above the spout centerline 11 and above the spout center perpendicular 12c.

[0025] Furthermore, in this embodiment, the opening start direction from which the half-cut line 32 extends from the notch 31 is at an angle of 15° or more from the MD direction, and is lower than the MD direction. Moreover, the angle between the MD direction and the opening start direction is smaller than the angle between the MD direction and the direction of the perpendicular to the spout centerline 11 plus 30°.

[0026] In the example shown in Figure 2, with the notch 31 and half-cut line 32 centered at the starting point 30, the perpendicular line 12 on the starting point 30 is perpendicular to the spout center line 11, and the angle reference line 13 is a straight line along the MD direction. The angle lower limit line 14 is a straight line that forms a 15° angle below the angle reference line 13. The angle upper limit line 15 is a straight line that forms a 30° angle in the rotational direction (counterclockwise in Figure 2) away from the angle reference line 13, relative to the perpendicular line 12 on the starting point 30.

[0027] For example, if the angle between the perpendicular line 12 on the starting point 30 and the angle reference line 13 (the angle of the spout) is 30°, the angle tolerance range A set between the angle lower limit line 14 and the angle upper limit line 15 will be the region of 15° or more and less than 60° relative to the angle reference line 13. Also, if the angle of the spout is 60°, the angle tolerance range A will be the region of 15° or more and less than 90° relative to the angle reference line 13. Note that at both ends of the arrow representing the angle tolerance range A, a black circle (●) is placed on the angle lower limit line 14 to indicate that the line is included, and a white circle (○) is placed on the angle upper limit line 15 to indicate that the line is not included.

[0028] For example, in Examples 1 to 4 and Comparative Examples 1 to 4 described later, the angle between the direction of the perpendicular to the spout centerline 11 and the MD direction (spout angle) is 30°, and the angle tolerance range A is set to 15° or more and less than 60° below the MD direction. If the spout angle is greater than 30°, the angle may be set to less than 60° so that the angle tolerance range A does not exceed 60° below the MD direction.

[0029] The laminated film used in the packaging bag 20 is not particularly limited, but may be one or more films selected from, for example, polyamide resin films such as aliphatic polyamide (nylon), polyester resin films such as polyethylene terephthalate (PET), and polyolefin resin films such as polyethylene (PE) and polypropylene (PP) as the base material. Furthermore, the laminated film may be a laminated film that includes two or more resin layers, such as a base material and a sealant layer. The two or more resin layers may include resin layers of the same type or resin layers of different types. As for the sealant layer, as will be described later, for example, a polyolefin resin film such as polyethylene (PE) or polypropylene (PP) may be used. The laminated film may also include an extruded resin layer.

[0030] The packaging bag 20 may use a laminated film with a monomaterial structure of polyolefin resin (hereinafter referred to as "PO laminated film"). The PO laminated film is not particularly limited, but examples include a laminated film containing two or more polyolefin resin films, such as a sealant layer and a base layer. The PO laminated film is not limited to a combination of polyethylene (PE) resin films (PE laminated film) or a combination of polypropylene (PP) resin films (PP laminated film), but may also include a combination of PE resin film and PP resin film. Furthermore, a polyolefin resin layer other than the film may be laminated to the resin film (a resin layer that can be manufactured as a product on its own) as an extruded resin layer, etc. The extruded resin layer is a resin layer that is molten by heat during lamination and is cooled and solidified after lamination.

[0031] A laminated film or PO-based laminated film may have, in the thickness direction, at least one base layer, an extruded resin layer, and a sealant layer in this order. In a PO-based laminated film before auxiliary lines 27, notches 31, and half-cut lines 32, etc., are formed, the resin layers such as the base layer, extruded resin layer, and sealant layer may be laminated with substantially uniform thickness over the entire surface of the laminated film.

[0032] The polyolefin resin used in the laminated film is not particularly limited, but examples include linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and polypropylene (PP).

[0033] Examples of materials for the base layer in PO-based laminated films include LLDPE, MDPE, HDPE, and PP. The thickness of the base layer is not particularly limited, but for example, it is about 10 to 50 μm. The base layer is not limited to a single-layer film, but may also be a multilayer film produced by co-extrusion or the like. The base layer preferably includes a stretched polyolefin resin layer. The stretching direction is not particularly limited, but for example, it may be uniaxial stretching in the MD or TD direction, or biaxial stretching in the MD and TD directions. Examples of stretching ratios include about 2 to 10 times.

[0034] Examples of materials for the extruded resin layer in a laminated film or PO-based laminated film include HDPE, LLDPE, LDPE, PP, or unoriented polyolefin resins. The thickness of the extruded resin layer is not particularly limited, but is typically around 10 to 50 μm. Examples of materials for the sealant layer include HDPE, LLDPE, LDPE, PP, or unoriented polyolefin resins. The thickness of the sealant layer is not particularly limited, but is typically around 50 to 180 μm.

[0035] When using a polyethylene resin layer as a polyolefin resin layer such as a base layer, extruded resin layer, and sealant layer, one type of polyethylene resin may be used alone, or two or more types of polyethylene resins may be blended and used. The polyethylene resin may be a homopolymer of ethylene, or a copolymer mainly composed of ethylene. Examples of monomers other than ethylene (comonomers) include one or more types of α-olefins such as 1-butene, 1-hexene, and 1-octene, cyclic olefins such as norbornene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When comonomers are used in the polyethylene resin, there may be one type or two or more comonomers. The proportion of ethylene in the constituent monomers of the polyethylene resin is preferably 50% by weight or more, for example, it may be 80 to 100% by weight. The polyethylene resin may contain resins derived from fossil resources such as petroleum, resins derived from biomass such as plants, or resins obtained through recycling.

[0036] When a polypropylene resin layer is used as a polyolefin resin layer such as a base layer, an extruded resin layer, and a sealant layer, one type of polypropylene resin may be used alone, or two or more types of polypropylene resins may be blended and used. The polypropylene resin may be a homopolymer of propylene (homoPP), or a random copolymer (randomPP) or block copolymer (blockPP) of propylene-ethylene copolymer, etc. Examples of monomers other than propylene (comonomers) include one or more types of α-olefins such as ethylene, 1-butene, 1-hexene, and 1-octene, and vinyl monomers such as vinyl acetate, vinyl chloride, and acrylic acid. When comonomers are used in the polypropylene resin, there may be one or more types of comonomers. The proportion of propylene in the constituent monomers of the polypropylene resin is preferably 50% by weight or more, for example, 80 to 100% by weight. The polypropylene resin layer may also contain recycled polypropylene.

[0037] The polyolefin resin layer may contain resins or additives other than polyolefin resins. The additives are not particularly limited, but examples include antioxidants, lubricants, antiblocking agents, flame retardants, UV absorbers, light stabilizers, antistatic agents, colorants, crosslinking agents, compatibilizers, and laser absorbers.

[0038] The laminated film or PO-based laminated film may include an adhesive layer or an anchor coat layer between the resin layers. The adhesive or anchor coat agent is not particularly limited, but examples include urethane compounds, epoxy compounds, isocyanate compounds, polyethyleneimine, and organotitanium compounds such as titanium alkoxides. The thickness of the adhesive layer or anchor coat layer can be, for example, about 0.1 to 10 μm, about 1 to 6 μm, or about 3 to 4 μm.

[0039] The laminated film or PO-based laminated film may include a printed layer. The printed layer can be formed by printing ink in a solid or patterned manner using printing methods such as gravure printing, letterpress printing, offset printing, screen printing, or inkjet printing. The thickness of the printed layer is not particularly limited, but examples include approximately 0.5 to 10 μm, 1 to 6 μm, or 1 to 4 μm. Inks containing laser absorbers can also be used.

[0040] The laminated film or PO-based laminated film may include layers of barrier resins such as ethylene-vinyl alcohol copolymer (EVOH), metals such as aluminum, and inorganic compounds such as silica and alumina. These barrier materials are preferably formed into thin layers by vapor deposition, co-extrusion, or the like. Depending on the application, these barrier layers made of different materials may be omitted. Examples of barrier properties include oxygen barrier properties and water vapor barrier properties.

[0041] The PO-based laminated film preferably has a total weight of polyolefin resin of 80% by weight or more and a total weight of dissimilar materials of 20% by weight or less relative to the weight of the PO-based laminated film, and more preferably has a total weight of polyolefin resin of 90% by weight or more and a total weight of dissimilar materials of 10% by weight or less. Here, the dissimilar materials refer to materials other than polyolefin resin.

[0042] A laminated film having a monomaterial composition of polyethylene-based resin (PE-based laminated film) preferably has a total weight of polyethylene-based resin of 80% by weight or more and a total weight of materials other than polyethylene-based resin of 20% by weight or less relative to the weight of the PE-based laminated film, and more preferably has a total weight of polyethylene-based resin of 90% by weight or more and a total weight of materials other than polyethylene-based resin of 10% by weight or less.

[0043] A laminated film having a monomaterial composition of polypropylene-based resin (PP-based laminated film) preferably has a total weight of polypropylene-based resin of 80% by weight or more and a total weight of materials other than polypropylene-based resin of 20% by weight or less relative to the weight of the PP-based laminated film, and more preferably has a total weight of polypropylene-based resin of 90% by weight or more and a total weight of materials other than polypropylene-based resin of 10% by weight or less.

[0044] The packaging bag 20 shown in Fig. 1 is a standing pouch as described above, and is formed from a pair of body members 21 and a bottom member 22 folded in two along a folding line 22a. On the upper side of the folding line 22a, the front and rear body members 21 are joined by left and right body seal portions 21a and 21b. On the lower side of the folding line 22a, the bottom member 22 is joined to the body member 21 to form a bottom seal portion 22b. The bottom member 22 of the packaging bag 20 may be omitted to form a flat bag.

[0045] The illustrated packaging bag 20 has an upper seal portion 23 at the upper part of the packaging bag 20 where the space between the front and rear body members 21 is sealed. The left and right sides of the storage portion 20a may be sealed by the body seal portions 21a and 21b, the content may be filled in a state where the filling port at the upper part of the storage portion 20a is open, and after filling, the filling port may be sealed as the upper seal portion 23.

[0046] When opening the spout 24, after breaking the non-penetrating portions 27a and 27b of the auxiliary line 27, the tongue-shaped portion 28 may be pinched to tear the body member 21 from the notch 31 along the half-cut line 32. When pouring out the contents from the opening along the half-cut line 32, the mouth of the container to which the contents are poured may be locked to the locking portion 29 disposed on the opposite side of the tongue-shaped portion 28 via the flow path 25. Note that the locking portion 29 is not an essential configuration and may be omitted.

[0047] Hereinafter, the present invention will be specifically described with reference to Examples.

[0048] <Materials Used> MDOPE: MD direction uniaxially stretched film of HDPE BOPE: biaxially stretched film of LLDPE LLDPE: sealant layer or extruded resin layer of LLDPE

[0049] (Comparative Example 1) After bonding MDOPE (25 µm thick) and BOPE (25 µm thick) by dry lamination (the adhesive is omitted in Table 1 and indicated by " / / "), lamination was performed with a sealant layer (LLDPE, 70 µm thick) via an extruded resin layer (LLDPE, 20 µm thick). Using the obtained laminated film as a body member, the packaging bag 20 shown in Fig. 1 was produced. As shown in Fig. 4, the half-cut line was formed by laser processing from the outside such that the unsealing start direction in which the half-cut line 32 extends from the notch 31 coincides with the MD direction (the angle therebetween is 0°).

[0050] (Comparative Examples 2 to 4, Examples 1 to 4) In Comparative Example 2, as shown in Fig. 5, the unsealing start direction was set to 10° downward from the MD direction. In Example 1, as shown in Fig. 6, the unsealing start direction was set to 15° downward from the MD direction. In Example 2, as shown in Fig. 7, the unsealing start direction was set to 30° downward from the MD direction. In Example 3, as shown in Fig. 8, the unsealing start direction was set to 45° downward from the MD direction. In Example 4, as shown in Fig. 9, the unsealing start direction was set to 50° downward from the MD direction. In Comparative Example 3, as shown in Fig. 10, the unsealing start direction was set to 60° downward from the MD direction. In Comparative Example 4, as shown in Fig. 11, the unsealing start direction was set to 90° downward from the MD direction. In all cases, packaging bags were produced using the same materials and methods as in Comparative Example 1, except for the shape of the half-cut line.

[0051] (Ease of tearing by hand - sensory evaluation) The ease of tearing by hand (sensory evaluation) of the packaging bags was evaluated according to the following criteria: • Excellent (○): Can be torn without force. • Good (△): Can be torn with a little force. • Poor (×): Cannot be torn without strong force.

[0052] (Ease of tearing by hand and line conformity) The ease of tearing by hand (line conformity) of the packaging bags was evaluated according to the following criteria: • Excellent (○): 8 or more out of 10 bags can be torn by hand along the line. • Good (△): 6 to 7 out of 10 bags can be torn by hand along the line. • Poor (×): Fewer than 6 out of 10 bags can be torn by hand along the line.

[0053] (Pouring Ease) The pouring ease of the packaging bags was evaluated according to the following criteria: • Excellent (○): All 10 bags can be poured without blockage. • Good (△): One to four out of ten bags are blocked. • Poor (×): Five or more out of ten bags are blocked and difficult to pour.

[0054]

[0055] As shown in Table 1, when the opening start direction from the notch to the half-cut line is within the angle tolerance range described above, the product offers excellent tearability along the half-cut line and superior pourability after opening.

[0056] A...Angle tolerance range, 11...Center line of the spout, 12...Perpendicular line on the starting point, 12a...Perpendicular line on the tip side of the spout, 12b...Perpendicular line on the base side of the spout, 12c...Perpendicular line on the center of the spout, 13...Angle reference line, 14...Angle lower limit line, 15...Angle upper limit line, 20...Packaging bag, 20a...Storage section, 21...Body member, 21a, 21b...Body seal section, 22...Bottom member, 22a...Fold line, 22b...Bottom seal section, 23...Top seal section, 24...Spout, 25...Flow path, 25a, 25b...Flow path forming seal section, 25c...Flow path sealing seal section, 25p, 25q...Boundary line, 26...Opening start section, 27...Auxiliary line, 27a, 27b...Non-penetrating section, 28...Tongue-shaped section, 29...Locking section, 30...Starting point, 31...Notch, 32...Half-cut line.

Claims

A packaging bag formed from a laminated film, The packaging bag has a body member formed from the laminated film, which includes a storage section for containing the contents and a spout for dispensing the contents. On the surface including the body member, when the horizontal direction (TD) perpendicular to the mechanical direction (MD) of the body member is defined as the vertical direction, the spout is positioned above the housing portion. The spout includes a flow path surrounded by the body member, and a sealing portion formed by the seal of the body member on at least one side in the width direction of the flow path and on the tip side of the flow path. An auxiliary line for initiating opening is formed on one side of the sealing portion in the width direction of the flow path, including a portion that penetrates the body member in the thickness direction. The auxiliary line is connected to or close to the opening start notch in the spout extension region that extends from the base side of the spout toward the tip side of the spout. The body member surrounding the flow path has a half-cut line formed in it that crosses the flow path, connected to or adjacent to the notch. In the aforementioned spout, when the spout centerline is defined midway between the boundary lines on both sides in the width direction of the flow path, the spout centerline is positioned in an upward-sloping direction, different from the machine direction and the lateral direction. On the surface including the body member, among the perpendiculars to the spout center line, the perpendicular that touches the auxiliary line at the tip side of the spout extension region is defined as the spout tip side perpendicular, and the perpendicular that touches the auxiliary line at the base side of the spout extension region is defined as the spout base side perpendicular, and when the spout center perpendicular is defined at an equidistant distance from the spout tip side perpendicular and the spout base side perpendicular, the notch is located above the spout center line and in a region above the spout center perpendicular, The opening start direction from which the half-cut line extends from the notch is lower than the machine direction and has an angle of 15° or more from the machine direction. A packaging bag characterized in that the angle between the machine direction and the opening start direction is less than the angle between the machine direction and the direction of the perpendicular to the center line of the spout plus 30°. 　 The packaging bag according to claim 1, characterized in that the angle between the machine direction and the opening start direction is less than 60°. 　 The packaging bag according to claim 1 or 2, characterized in that the laminated film has a monomaterial structure of polyolefin resin. 　 The packaging bag according to any one of claims 1 to 3, characterized in that the body member includes a polyolefin resin film that is uniaxially stretched in the direction of the machine. 　 The packaging bag according to any one of claims 1 to 4, characterized in that the contents include a liquid. 　 The packaging bag according to any one of claims 1 to 5, characterized in that the packaging bag is a standing pouch including a bottom member joined to the body member at the lower side of the storage portion.

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