Film laminates and packaging bags

Abstract

To provide a film laminate and a packaging bag that can improve an opening performance of a pouring part while realizing monomaterialization.SOLUTION: A film laminate according to the present disclosure includes a base layer made of polyethylene resin and a sealant layer made of polyethylene resin. In this film laminate, the sealant layer has easy tearability in a machine direction MD. Further, a standing pouch 10 according to the present disclosure is a packaging bag formed by sealing the sealant layer of the film laminate described above. The standing pouch 10 includes: a container 11 capable of containing a predetermined content, a sealing portion 12 formed around the container 11, and a pouring portion 20 including a spout 21 capable of pouring its contents into the container when opened. A planned tear line 26 defining the opening of the spout 21 is arranged along the machine direction MD of the sealant layer.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This disclosure relates to film laminates and packaging bags. [Background technology]

[0002] Patent Document 1 discloses a packaging bag using a film laminate in which a polyolefin resin, such as a low-density polyethylene film, is laminated as a sealant layer on a base film made of polypropylene film or the like. This packaging bag is provided with a dispensing section for dispensing the contents, and an opening line for opening the dispensing section is formed, for example, by laser processing the base film. In the packaging bag described in Patent Document 1, the contents can be dispensed from the dispensing spout of the dispensing section by opening the dispensing section along such an opening line.

[0003] On the other hand, packaging bags formed using laminated films made of different materials are not easy to separate by material after being collected as waste, and improvement is desired. Therefore, Patent Document 2 discloses an example of a laminate film for packaging bags that is substantially composed solely of polyethylene. By using such a laminate film made of a single material, recyclability can be improved. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2005-145502 [Patent Document 2] Japanese Patent Publication No. 2020-062786 [Overview of the project] [Problems that the invention aims to solve]

[0005] The laminate film described in Patent Document 2 is substantially made of polyethylene material, thus enabling the monomaterialization of packaging materials. However, polyethylene material may not absorb energy depending on the type of laser, making it difficult to form the opening line for the dispensing portion on the packaging bag with a laser. Therefore, although monomaterialization of packaging materials can be achieved, there is a problem of reduced opening performance.

[0006] The purpose of this disclosure is to provide a film laminate and a packaging bag that can improve the opening performance of the dispensing section while achieving monomaterialization. [Means for solving the problem]

[0007] One aspect of this disclosure relates to a film laminate. This film laminate comprises a base layer formed from polyethylene resin and a sealant layer formed from polyethylene resin. In this film laminate, the sealant layer is easily tearable in the mechanical direction (MD direction).

[0008] In this film laminate, the sealant layer formed from polyethylene resin has easy tearing properties in the machine direction (MD direction). By forming a packaging bag using a film laminate containing such a tearable sealant layer, it is possible to achieve monomaterialization while improving the opening performance of the dispensing portion of the packaging bag.

[0009] Another aspect of this disclosure relates to a packaging bag. This packaging bag is formed by sealing the sealant layer of the film laminate described above, and comprises a storage section capable of holding a predetermined contents, a sealing section formed around the storage section, and a dispensing section including a spout from which the contents can be dispensed when opened. In this packaging bag, the opening line defining the opening of the spout is aligned with the machine direction of the sealant layer.

[0010] This packaging bag achieves monomaterialization by using the aforementioned film laminate. Furthermore, in this packaging bag, the opening line defining the opening of the spout is aligned with the machine direction of the sealant layer, and since it has easy tearing properties in this direction, it can be easily opened along the opening line. This improves the opening performance of the spout of the packaging bag. Thus, this packaging bag allows for improved opening performance of the spout while achieving monomaterialization. Moreover, in this packaging bag, the sealant layer has easy tearing properties in the machine direction, and the opening line is provided along this direction of easy tearing. In this case, since the opening line of the packaging bag is not made with a laser or other means to create scratches (e.g., half-cut lines), although there is a certain degree of easy tearing, it does not tear as easily as an opening line that has been laser-processed. Therefore, this packaging bag prevents the spout of the packaging bag from being accidentally opened by contact with cardboard packaging during transport.

[0011] In the above-described packaging bag, it is preferable that a notch is provided at one end of the opening line of the dispensing section. As mentioned above, although the opening line of this packaging bag is provided along the tearing direction, it is not a conventional laser-processed opening line, so the dispensing section is not extremely easy to open. Therefore, by providing a notch at the initial end of the opening of the dispensing section, it is possible to guide the opening process of the dispensing section, thereby improving the opening performance.

[0012] In the above-described packaging bag, the dispensing section may have a first dispensing seal section and a second dispensing seal section that define the dispensing outlet. The second dispensing seal section may be shorter than the first dispensing seal section, and the straight length of the second dispensing seal section from the base to the tip may be 5 mm or more and 10 mm or less. If the direct length of the second dispensing seal section defining the dispensing section is 5 mm or more, it becomes possible to perform the refilling work stably when the dispensing section is opened and the refilling work is performed. Furthermore, if the direct length of the second dispensing seal section defining the dispensing section is 10 mm or less, when the dispensing section of the packaging bag is opened and inserted into the container to be refilled, the flow path in the dispensing section does not become narrowed, and the refilling work can be performed quickly.

[0013] In the above-described packaging bag, the dispensing section may have a first dispensing seal section and a second dispensing seal section that define the dispensing outlet, and the width of the first dispensing seal section and the second dispensing seal section in the machine direction may be 3 mm or more. In this case, the rigidity of the dispensing outlet of the dispensing section is increased, and when the dispensing section of the packaging bag is inserted into the container to be refilled, dispensing can be performed stably. This makes the refilling work easier.

[0014] In the above-described packaging bag, the dispensing portion is provided at the corner of the storage portion, the first dispensing seal portion is provided on the outer edge side of the packaging bag, and the second dispensing seal portion is provided inward from the first dispensing seal portion, and the length of the second dispensing seal portion may be less than half the length of the first dispensing seal portion. In this case, the above-described packaging bag may further be provided with an injection port for injecting the contents into the storage portion, which is sealed after injection, and the minimum distance between the second dispensing seal portion and the injection portion may be 5 mm or less. In this case, even when using a relatively soft material such as polyethylene resin, rigidity can be ensured in the dispensing portion, making it possible to perform refilling work using the dispensing portion more reliably.

[0015] In the above-described packaging bag, the seal portion has a first seal portion provided on the dispensing portion side and a second seal portion provided on the opposite side from the first seal portion in the machine direction, and it is preferable that the angle between the outer edge along the spout and the outer edge of the connecting seal portion that connects the spout to the first seal portion is obtuse. According to this embodiment, when the dispensing portion is opened and the dispensing portion of the packaging bag is inserted into the container to be refilled, the dispensing portion, which is the spout, becomes easier to fit into the container (bottle, etc.), making the refilling work easier.

[0016] In the above-described packaging bag, the stiffness of the film laminate in the machine direction may be 200 mN / 15 mm or less. In this case, the film laminate will be made of a softer material, making it easier to squeeze out the contents from the packaging bag formed using such a film laminate. The stiffness of the film laminate in the machine direction can be measured in accordance with JIS K 7125, for example, using a loop stiffness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.). The measurement conditions can be, for example, a loop length of 50 mm, a sample width of 15 mm, the sample orientation in the processing flow direction (machine direction), and a compression amount (compression distance) of 15 mm.

[0017] In the above-described packaging bag, the dispensing section preferably has a gripping tab that can be grasped by the user of the packaging bag, and the gripping tab may protrude outwards from the packaging bag. This makes it easier to open the dispensing section. In this packaging bag, although it is designed to be easily torn along the intended opening line, it is not configured to have a cut made along the intended opening line by a laser or the like, so although it is easily torn, the dispensing section will not be accidentally opened during transport. Therefore, even if the gripping tab for opening is provided facing outwards, accidental opening is prevented.

[0018] In the above-mentioned packaging bag, it is preferable that the polyethylene resin constituting the sealant layer is C4-LLDPE. C4-LLDPE is a type of LLDPE (linear low-density polyethylene) composed of a copolymer of ethylene and 1-butene, and has a molecular structure in which a side chain with 4 carbon atoms derived from 1-butene is present in the main chain of LLDPE derived from ethylene. Since C4-LLDPE has shorter side chains and a lower melt flow rate (MFR) than C6-LLDPE and C8-LLDPE, it has relatively low tensile impact strength, tensile strength, and tensile modulus of elasticity. Therefore, when the polyethylene resin constituting the sealant layer is C4-LLDPE, easy tearability in the machine direction of the sealant layer can be easily imparted. Note that the density of such C4-LLDPE may be less than 0.925 g / cm 3 and may also be 0.900 - 0.920 g / cm 3 . Also, the melt flow rate (MFR) of C4-LLDPE may be less than 5 g / 10 min, preferably 0.5 g / 10 min or more and less than 5 g / 10 min, and more preferably 2 g / 10 min or more and less than 5 g / 10 min.

[0019] In the above-mentioned packaging bag, the polyethylene resin constituting the base material layer may be HDPE. By forming the base material layer from HDPE (high-density polyethylene), the tear performance of the sealant layer is not inhibited. Therefore, according to this packaging bag, while realizing monomaterialization, the opening performance of the pouring part can be improved.

Advantages of the Invention

[0020] According to the present disclosure, while realizing monomaterialization, the opening performance of the pouring part can be improved.

Brief Description of the Drawings

[0021] [Figure 1] FIG. 1 is a front view schematically showing an embodiment of a standing pouch according to the present disclosure. [Figure 2]Figure 2 is a schematic perspective view showing the pair of film laminates and bottom tape that make up the standing pouch shown in Figure 1. [Figure 3] Figure 3 is a schematic cross-sectional view showing the configuration of the standing pouch shown in Figure 1. [Figure 4] Figures 4(a) and 4(b) are schematic cross-sectional views showing one embodiment of the film laminate according to the present disclosure. [Figure 5] Figure 5 is a plan view showing an enlarged view of the area S near the dispensing part of the standing pouch shown in Figure 1. [Figure 6] Figure 6 is a plan view showing a modified example of the standing pouch according to this disclosure. [Modes for carrying out the invention]

[0022] The embodiments of this disclosure will be described in detail below. Here, a standing pouch will be described as an example of a packaging bag in which monomaterialization has been achieved. Standing pouches are used as refill pouches for shampoo, hand soap, detergent, etc., and as pouches for soup, seasonings, etc. However, the present invention is not limited to the following embodiments.

[0023] <Standing Pouch> Figure 1 is a schematic front view showing a standing pouch according to this embodiment. Figure 2 is a schematic exploded perspective view showing a pair of film laminates and a bottom tape constituting the standing pouch shown in Figure 1. Figure 3 is a schematic cross-sectional view showing the configuration of the standing pouch shown in Figure 1. As shown in Figure 1, the standing pouch 10 (packaging bag) includes a storage section 11 that can accommodate a predetermined contents (and is periphery-capable), a sealing section 12 formed around the storage section 11, an injection section 13 having an injection port for injecting the contents into the storage section 11, and an injection section 20 that can dispense the contents when opened. The sealing section 12 has a first sealing section 12a provided on one side of the storage section 11 (the left side in the figure), a second sealing section 12b provided on the other side of the storage section 11 (the right side in the figure), and a third sealing section 12c provided on the bottom of the storage section 11. Furthermore, the injection section 13 can be heat-sealed and closed after the contents have been stored in the storage section 11.

[0024] As shown in Figure 2, such a standing pouch 10 is formed by cutting a film laminate 30 (see Figure 4), which will be described in detail later, into a predetermined shape, and sealing the film laminates 30A and 30B with their respective sealant layers L2 facing inward at predetermined locations. In forming the standing pouch 10, when sealing the film laminates 30A and 30B, the bottom tape 40 is sandwiched between the film laminates 30A and 30B at the bottom to perform the sealing. This forms the first seal portion 12a, the second seal portion 12b, and the third seal portion 12c described above. Each pair of film laminates 30A and 30B and the bottom tape 40 are composed of a laminate containing at least a base layer L1 and a sealant layer L2 (see Figure 4). The formation of the standing pouch by heat sealing can be carried out in the same way as conventional methods.

[0025] The bottom tape 40 has one mountain fold portion 41. That is, when the standing pouch 10 is standing upright, the bottom tape 40 is arranged in an inverted V shape (see Figures 2 and 3). The third sealing portion 12c at the bottom of the standing pouch 10 is composed of a heat-seal portion 14 and a heat-seal portion 15, as shown in Figure 3. The heat-seal portion 14 is the portion where the bottom 31a of the film laminate 30A and one bottom 41a of the bottom tape 40 are heat-sealed. The heat-seal portion 15 is the portion where the bottom 31b of the film laminate 30B and the other bottom 41b of the bottom tape 40 are heat-sealed. As shown in Figure 1, the film laminates 30A, 30B and the bottom tape 40 are heat-sealed so that the bottom of the area that contains the contents is curved and the upper side is arc-shaped.

[0026] As described above, the sealing portion 12 of the standing pouch 10 has a first sealing portion 12a provided on the dispensing portion 20 side and a second sealing portion 12b provided on the opposite side of the first sealing portion 12a in the horizontal direction (or mechanical direction MD). The widths of the first sealing portion 12a and the second sealing portion 12b of the sealing portion 12 are, for example, 5 to 18 mm, or 7 to 15 mm. A width of 5 mm or more for each sealing portion 12 tends to achieve sufficient sealing strength, while a width of 18 mm or less tends to make it easier to secure a sufficient volume of contents in the standing pouch 10.

[0027] As shown in Figure 1, the standing pouch 10 has fused portions 16 and 17 on both sides of the bottom (third seal portion 12c). In this embodiment, two fused portions 16 are formed vertically on one side of the standing pouch 10, and two fused portions 17 are formed vertically on the other side. The fused portions 16 and 17 join the film laminate 30A and the film laminate 30B. The fused portions 16 and 17 are locations where the sealant layers L2 of the film laminates 30A and 30B are locally fused together through notches 44 and 45 provided in the bottom tape 40. As shown in Figure 3, the notches 44 and 45 of the bottom tape 40 are located in the region between the mountain fold portion 41 and the bottom edges 42 and 43, and are provided on the side of the bottom tape 40. The provision of fused sections 16 and 17 on both sides of the bottom further improves the self-supporting ability and drop resistance of the standing pouch 10. While this example illustrates the case where two pairs of notches 44 and 45 are provided on one side of the bottom tape 40 to form two fused sections 16 and 17, for example, a pair of notches may be provided on one side of the bottom tape 40 to form one fused section 16 or 17.

[0028] From the viewpoint of recyclability, the polyethylene content in the standing pouch 10 is preferably 90% by mass or more. From the viewpoint of achieving a higher degree of monomaterialization, the polyethylene content in the standing pouch 10 is more preferably 92% by mass or more, and even more preferably 95% by mass or more.

[0029] <Film laminate> Here, with reference to Figure 4, the film laminates 30 that constitute the pair of film laminates 30A, 30B and the bottom tape 40 of the standing pouch 10 will be described. The film laminates 30 are substantially made of polyethylene resin. Figure 4 is a schematic cross-sectional view showing the film laminate according to this embodiment. The film laminate 30 shown in Figure 4(a) includes a base layer L1 and a sealant layer L2. The sealant layer L2 constitutes the innermost surface of the film laminate 30. Alternatively, as shown in Figure 4(b), a film laminate 35 consisting of a base layer L1 having two layers L1a and L1b and a sealant layer L2 may be used.

[0030] The polyethylene content in the film laminates 30 and 35 is preferably 90% by mass or more. A polyethylene content of 90% by mass or more in the film laminates 30 and 35 is preferable because it facilitates the realization of monomaterialization. From this viewpoint, the polyethylene content in the film laminates 30 and 35 is more preferably 92% by mass or more, and even more preferably 95% by mass or more. Realization of monomaterialization is preferable because it facilitates resin regeneration. The film laminates 30 and 35 have excellent impact resistance because they are flexible and easily stretchable.

[0031] Furthermore, the film laminates 30 and 35 may be films with a stiffness in the machine direction of 200 mN / 15 mm or less. In this case, since the film laminates 30 and 35 will be made of a softer material, it will be easier to squeeze the contents out of the standing pouch 10 formed using such film laminates. The stiffness of the film laminates 30 and 35 in the machine direction will conform to JIS K 7125 and can be measured, for example, using a loop stiffness tester (manufactured by Toyo Seiki Seisakusho Co., Ltd.). The measurement conditions can be, for example, a loop length of 50 mm, a sample width of 15 mm, the sample orientation in the processing flow direction (machine direction), and a compression amount (compression distance) of 15 mm.

[0032] [Base material layer] The base layer L1 is preferably composed of an unstretched polyethylene resin film. Because the base layer L1 is unstretched, the resin has almost no orientation, making it easy to stretch and difficult to break under external stresses such as tension and shear. The same applies when the base layer L1 consists of layers L1a and L1b. The base layer L1 may also be a stretched polyethylene resin film. The thickness of the base layer L1 is, for example, 5 to 800 μm, and may be 5 to 500 μm or 10 to 50 μm. The base layer L1 has a melting point 20°C or more higher than the sealant layer L2, preferably 25°C or more higher. The difference in melting points between the two suppresses the melting of the base layer L1 during the heat sealing process. The difference in seal rise temperature between the base layer L1 and the sealant layer L2 is preferably 25°C or more, more preferably 30°C or more. The seal rise temperature refers to the temperature at which seal strength is achieved. The melting point of polyethylene resin can be measured using a differential scanning calorimetry (DSC).

[0033] The melting point of the base layer L1 is preferably 120°C or higher, and more preferably 125°C or higher. Examples of polyethylene constituting the base layer L1 include high-density polyethylene (HDPE) and medium-density polyethylene (MDPE). Of these, HDPE and MDPE with a density of 0.925 g / cm³ are preferred from the viewpoint of heat resistance. 3 It is preferable to use the above materials. In particular, materials with a density of 0.93 to 0.98 g / cm³ are preferred. 3 It is preferable to use high-density polyethylene within the specified range.

[0034] The polyethylene resin constituting the base layer L1 is not limited to petroleum-derived materials, and may be partially or entirely made of bio-derived resin materials (for example, biomass polyethylene using biomass-derived ethylene as a raw material). A method for producing biomass-derived polyethylene is disclosed, for example, in Japanese Patent Publication No. 2010-511634. The base layer L1 may include commercially available biomass polyethylene (such as Green PE manufactured by Braschem), or it may include mechanically recycled polyethylene made from used polyethylene products or resin (so-called burrs) generated during the manufacturing process of polyethylene products.

[0035] The base layer L1 may contain components other than polyethylene resin. Examples of such components include polyamide, polyethylene terephthalate, polypropylene, polyvinyl alcohol, and biodegradable resin materials (e.g., polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified polyvinyl alcohol, casein, modified starch, etc.). The base layer L1 may also contain additives such as antistatic agents, ultraviolet absorbers, plasticizers, lubricants, and colorants. The amount of components other than polyethylene resin in the base layer L1 is preferably 15% by mass or less, and more preferably 10% by mass or less, based on the total amount of the base layer L1.

[0036] [Sealant layer] The sealant layer L2, like the base layer L1, is composed of a polyethylene resin film. The thickness of the sealant layer L2 is, for example, 40 to 150 μm, and may also be 20 to 250 μm. The polyethylene resin film constituting the sealant layer L2 is a film that is easily torn in the machine direction (MD direction).

[0037] The polyethylene resin constituting the sealant layer L2 having such easy tearing properties is preferably, for example, C4-LLDPE. C4-LLDPE is a type of LLDPE (linear low-density polyethylene) made of a copolymer of ethylene and 1-butene, and has a molecular structure in which the LLDPE main chain derived from ethylene has side chains with 4 carbon atoms derived from 1-butene. Compared to C6-LLDPE and C8-LLDPE, C4-LLDPE has shorter side chains and a lower melt flow rate (MFR), resulting in relatively lower tensile impact strength, tensile strength, and tensile modulus. Therefore, by using C4-LLDPE as the polyethylene resin constituting the sealant layer L2, easy tearing properties in the mechanical direction can be easily imparted to the sealant layer L2.

[0038] The melt flow rate (MFR) of the sealant layer L2 is less than 5 g / 10 min, preferably 0.5 g / 10 min or more and less than 5 g / 10 min, and more preferably 2 g / 10 min or more and less than 5 g / 10 min. A melt flow rate of less than 5 g / 10 min results in a higher melt tension, which helps to suppress wrinkles during processing by methods such as inflation. In other words, because the sealant layer L2 is slightly less fluid when heated to melt, a smooth and transparent film can be produced.

[0039] The melting point of the sealant layer L2 is preferably 120°C or lower, and more preferably 95 to 110°C. The density of the sealant layer L2 is 0.925 g / cm³. 3 Less than (more preferably 0.900~0.920 g / cm³) 3 It is preferable that the material is composed of polyethylene resin. For example, the linear low-density polyethylene (LLDPE) described above can be used, and very low-density polyethylene (VLDPE) may also be used if it can impart easy tearing properties in the mechanical direction of the sealant layer L2, or a blend of LLDPE and VLDPE may be used.

[0040] As part or all of the polyethylene constituting the sealant layer L2, biomass polyethylene using ethylene derived from biomass as a raw material may be used. Such a sealant film is disclosed, for example, in JP-A-2013-177531. The sealant layer L2 may contain mechanically recycled polyethylene using used polyethylene products or resin (so-called burr) generated in the manufacturing process of polyethylene products as raw materials.

[0041] (Other layers) The laminate may include an adhesive layer (not shown) between the base material layer L1 and the sealant layer L2. The adhesive for forming the adhesive layer can be selected according to the bonding method, and urethane adhesives, polyester adhesives, etc. can be used. By providing such an adhesive layer, the interlayer adhesion between the base material layer L1 and the sealant layer L2 can be increased, making delamination difficult, and the pressure resistance and impact resistance as a pouch can be maintained.

[0042] It is preferable that the adhesive layer does not contain chlorine. By the adhesive layer not containing chlorine, it is possible to prevent the adhesive or the recycled resin after recycling from being colored or generating an odor by heat treatment. From the viewpoint of environmental consideration, it is preferable to use a biomass material for the adhesive layer. Also, biomass polyethylene can be used for polyethylene. From the viewpoint of environmental consideration, it is preferable that the adhesive does not contain a solvent.

[0043] The film laminate 30 may further include a gas barrier layer, for example, from the viewpoint of improving the gas barrier properties against water vapor and oxygen. The gas barrier layer may be provided between the base material layer L1 and the sealant layer L2, or may be provided on the surface of the base material layer L1 opposite to the sealant layer L2. The water vapor transmission rate of the laminate is, for example, 5 g / m 2 ·day, and may be 1 g / m 2 ·day or less, or 0.5 g / m 2 ·day or less. The oxygen transmission rate of the film laminate 30 is, for example, 1 cc / m 2 ·atm·day, and 0.5 g / m 2·atm·day or less or 0.2g / m 2 It may be less than or equal to atm·day. The inclusion of a gas barrier layer in the laminate protects the contents from degradation by water vapor and oxygen, making it easier to maintain quality over the long term.

[0044] An example of a gas barrier layer is a vapor-deposited inorganic oxide layer. By using a vapor-deposited inorganic oxide layer, high barrier properties can be obtained with a very thin layer that does not affect the recyclability of the laminate. Examples of inorganic oxides include aluminum oxide, silicon oxide, magnesium oxide, and tin oxide. From the viewpoint of transparency and barrier properties, the inorganic oxide may be selected from the group consisting of aluminum oxide, silicon oxide, and magnesium oxide. The thickness of the vapor-deposited inorganic oxide layer can be, for example, 5 nm to 100 nm, or 10 nm to 50 nm. A thickness of 5 nm or more tends to exhibit good barrier properties, while a thickness of 100 nm or less tends to maintain the flexibility of the laminate. The vapor-deposited layer can be formed by, for example, physical vapor deposition or chemical vapor deposition.

[0045] The laminate may include a metal layer (metal foil) in addition to, or instead of, the inorganic oxide vapor deposition layer. Various metal foils made of aluminum, stainless steel, etc., can be used as the metal layer, and among these, aluminum foil is preferred in terms of moisture resistance, processability such as ductility, and cost. As the aluminum foil, general soft aluminum foil can be used. Among these, aluminum foil containing iron is preferred in terms of excellent pinhole resistance and ductility during molding. When a metal layer is provided, its thickness may be 7 to 50 μm or 9 to 15 μm in terms of barrier properties, pinhole resistance, processability, etc.

[0046] The film laminate 30 may have an anchor coat layer between the base layer L1 and the sealant layer L2. The anchor coat layer may be a very thin layer that does not affect the recyclability of the laminate, and can be formed using an anchor coat agent. Examples of anchor coat agents include acrylic resin, epoxy resin, acrylic urethane resin, polyester polyurethane resin, polyether polyurethane resin, and polyvinyl alcohol resin. From the viewpoint of heat resistance and interlayer adhesion strength, acrylic urethane resin and polyester polyurethane resin are preferred as anchor coat agents.

[0047] The film laminate 30 may further include, for example, a printed layer. The printed layer may be provided between the substrate layer L1 and the sealant layer L2, or on the side of the substrate layer L1 opposite to the sealant layer L2. When a printed layer is provided, it is preferable to use a printing ink that does not contain chlorine to prevent discoloration or odor generation when the printed layer is remelted. Furthermore, it is preferable from an environmental perspective to use biomass materials for the compounds contained in the printing ink.

[0048] <Pour section> Next, with reference to Figures 1 and 5, the dispensing section 20 of the standing pouch 10, which is made using film laminates 30 and 35 that are easily torn in the machine direction, will be described in detail. Figure 5 is a plan view showing an enlarged view of the area S near the dispensing section of the standing pouch shown in Figure 1. As shown in Figures 1 and 5, the dispensing section 20 includes a spout 21, a gripping tab 22, a first dispensing seal section 23, a second dispensing seal section 24, a connecting seal section 25, an opening line 26, and a notch 27. The dispensing section 20 is provided adjacent to the seal section 13a of the injection section 13.

[0049] The spout 21 is the part for dispensing the contents from the opening 21a when the dispensing section 20 is opened along the planned opening line 26, and includes the flow path 21b from the storage section 11. The spout 21 is defined by the first dispensing seal section 23 and the second dispensing seal section 24, which extend in a direction slightly oblique to the vertical direction, and the portion including the flow path 21b is defined.

[0050] The gripping tab 22 is a gripping portion used to pull the dispensing portion 20 when opening it to transfer the contents contained in the storage portion 11. The gripping tab 22 is sealed on three sides, excluding the side facing the dispensing spout 21. By pulling the gripping tab 22 along the intended opening line 26 in the direction of arrow A, the opening 21a of the dispensing spout 21 opens, and the dispensing portion 20 is opened. The gripping tab 22 has a protruding portion 22a that extends outward from the standing pouch 10, and the gripping tab 22 is designed to be pulled from the outside inward. The sealed portion of the gripping tab 22 is connected to the first dispensing seal portion 23 and the second dispensing seal portion 24.

[0051] The first dispensing seal portion 23 is a vertically extending seal portion provided on the outer edge side of the standing pouch 10, with its upper end connected to the gripping tab 22 and its lower end connected to the first seal portion 12a via a connecting seal portion 25. The second dispensing seal portion 24 is a vertically extending seal portion provided inward from the first dispensing seal portion 23, with its upper end connected to the gripping tab 22 and its lower end connected to the seal portion 13a of the injection portion 13 via a curved surface portion. The first dispensing seal portion 23 and the second dispensing seal portion 24, like the first seal portion 12a and the second seal portion 12b, are portions where the sealant layers L2 of the film laminates 30A and 30B are sealed together. The width of the first dispensing seal portion 23 and the second dispensing seal portion 24 in the machine direction may be, for example, 3 mm or more (or 4 mm or more).

[0052] As described above, the first dispensing seal portion 23 is connected to the first seal portion 12a via the connecting seal portion 25. In this case, the angle α formed by the outer edge of the first dispensing seal portion 23 and the outer edge of the connecting seal portion 25 is, for example, 90 degrees or more and 180 degrees or less, forming an obtuse angle.

[0053] The second dispensing seal portion 24 is formed to be short such that the distance D2 from the base 24a connected to the seal portion 13a to the tip 24b connected to the gripping tab 22 is, for example, 5 mm or more and 10 mm or less. For example, the length D2 of the second dispensing seal portion 24 may be shorter than half the length D1 of the first dispensing seal portion 23. Also, the second dispensing seal portion 24 is formed adjacent to the seal portion 13a of the injection portion 13, and for example, the shortest separation distance (distance between their outer edges) at the point where the second dispensing seal portion 24 and the seal portion 13a face each other may be 5 mm or less.

[0054] The opening line 26 is a line used to tear and cut the dispensing section 20 when opening it, for example, to transfer the contents contained in the storage section 11 to another container. In the standing pouch 10 according to this embodiment, this opening line 26 is provided along the mechanical direction of the sealant layer L2. In other words, the opening line 26 is provided with easy tearing properties in the direction in which it extends, and the dispensing section 20 can be easily opened by tearing along the opening line 26. In this embodiment, no processing (e.g., formation of a half-cut line) is performed on the opening line 26 that extends horizontally, so no physical processing is performed. However, the opening line 26 may be printed, for example, as an opening line that serves as a guide when opening the dispensing section 20, so that the user of the standing pouch 10 can recognize it.

[0055] The notch 27 is located at one end of the opening line 26 and marks the starting point for opening the dispensing section 20, guiding the user when opening the dispensing section 20. The notch 27 may have the shape of a cut, notch, or recess. In the example shown in the figure, the notch 27 is located directly below the gripping tab 22 on the outside of the dispensing section 20, but the notch 27 may be located elsewhere as long as it can guide the user to the opening line 26.

[0056] As described above, with the standing pouch 10 and film laminate according to this embodiment, monomaterialization can be achieved by using polyethylene resin film laminates 30 and 35. Furthermore, in the standing pouch 10, the opening line 26 that defines the opening 21a of the spout 21 is aligned with the mechanical direction MD of the sealant layer L2, and since it has easy tearing properties in this direction, opening along the opening line 26 is made easy. This improves the opening performance of the spout 20 of the standing pouch 10. Thus, with this standing pouch 10, monomaterialization can be achieved while improving the opening performance of the spout 20. Moreover, in the standing pouch 10, the sealant layer L2 has easy tearing properties in the mechanical direction MD, and the opening line 26 is provided along this direction of easy tearing. In this case, since the standing pouch 10 does not have a laser or other means to create a cut (such as a half-cut line) on the opening line 26, it does have a certain degree of easy tearing, but it does not tear as easily as a laser-processed opening line. Therefore, the standing pouch 10 prevents the dispensing part of the packaging bag from being accidentally opened by contact with cardboard packaging during transport.

[0057] In the standing pouch 10, a notch 27 is provided at one end of the opening line 26 of the dispensing section 20. This allows for guidance during the opening process of the dispensing section 20, thereby improving opening performance.

[0058] In the standing pouch 10, the straight length from the base 24a to the tip 24b of the second dispensing seal portion 24 of the dispensing portion 20 may be 5 mm or more and 10 mm or less. When the direct length D2 of the dispensing portion 20 is 5 mm or more, it is possible to perform the refilling work stably when opening the dispensing portion 20 and performing the refilling work. Also, when the direct length D2 of the dispensing portion 20 is 10 mm or less, when the dispensing portion 20 of the standing pouch 10 is opened and inserted into the container to be refilled, the flow path 21b of the dispensing portion 20 does not narrow, and the refilling work can be performed quickly.

[0059] In the standing pouch 10, the angle α formed by the outer edge along the spout 21 and the outer edge of the connecting seal portion 25 that connects the spout 21 to the first seal portion 12a is obtuse. With this configuration, when the spout 20 is opened and the spout 20 of the standing pouch 10 is inserted into the container to be refilled, the spout 20 is easier to fit into the container (bottle, etc.), making the refilling process easier.

[0060] In the standing pouch 10, the stiffness of the film laminates 30 and 35 in the mechanical direction MD may be 200 mN / 15 mm or less. In this case, the film laminates 30 and 35 will be made of a softer material, making it easier to squeeze out the contents from the standing pouch 10 formed using such film laminates 30 and 35.

[0061] In the standing pouch 10, the width of the first dispensing seal portion 23 and the second dispensing seal portion 24 of the dispensing portion 20 in the machine direction is 3 mm or more. In this case, the rigidity of the dispensing outlet 21 of the dispensing portion 20 is increased, and when the dispensing portion 20 of the standing pouch 10 is inserted into the container to be refilled, dispensing can be performed stably. This makes the refilling work easier.

[0062] In the standing pouch 10, the first dispensing seal portion 23 is provided on the outer edge side of the standing pouch 10, and the second dispensing seal portion 24 is provided inward from the first dispensing seal portion 23, with the length D2 of the second dispensing seal portion 24 being shorter than half the length D1 of the first dispensing seal portion 23. Furthermore, the shortest separation distance D3 between the second dispensing seal portion 24 and the seal portion 13a of the injection portion 13 is 5 mm or less. In this case, even when using a relatively soft material such as polyethylene resin, rigidity can be ensured in the dispensing portion 20, making it possible to perform refilling work using the dispensing portion 20 more reliably.

[0063] In the standing pouch 10, the dispensing section 20 has a gripping tab 22 that can be grasped by the user of the standing pouch 10. The gripping tab 22 protrudes outward from the standing pouch 10. This makes it easier to open the dispensing section 20. In this standing pouch 10, although it is designed to be easily torn along the intended opening line 26, the intended opening line 26 of the standing pouch 10 is not scored with a laser or the like. Therefore, although it is easily torn, the dispensing section 20 will not be accidentally opened during transport. Thus, even if the gripping tab 22 for opening is provided facing outward, accidental opening is prevented.

[0064] In the standing pouch 10, the polyethylene resin constituting the sealant layer L2 is C4-LLDPE. By using C4-LLDPE as the polyethylene resin constituting the sealant layer L2, easy tearability can be easily imparted to the sealant layer L2 in the mechanical direction MD, making it possible to easily open the dispensing section 20 of the standing pouch 10. In addition, in the standing pouch 10, the polyethylene resin constituting the base layer L1 is HDPE. By forming the base layer L1 from HDPE, the tear performance of the sealant layer L2 described above is not hindered. Therefore, with this standing pouch 10, it is possible to improve the opening performance of the dispensing section 20 while achieving monomaterial construction.

[0065] Although embodiments of the present disclosure have been described in detail above, the present invention is not limited to the above embodiments. For example, in the above embodiments, a standing pouch was exemplified as an application target for the film laminate 30, but the film laminate 30 according to the embodiment may be applied to the manufacture of other packaging bags. For example, one film laminate 30, 35 may be folded in half so that the sealant layers L2 face each other, and then sealed on three sides to form a bag shape, or two film laminates 30, 35 may be stacked so that the respective sealant layers L2 face each other, and then heat-sealed on all four sides to form a bag shape. The packaging bag can contain contents such as food or pharmaceuticals. The packaging bag can be subjected to heat sterilization treatment such as boiling.

[0066] Furthermore, in the above embodiment, the gripping tab 22 of the dispensing section 20 of the standing pouch 10 was configured to protrude outward, but this is not the only configuration. For example, as shown in Figure 6, the gripping tab 22A of the dispensing section 20A of the standing pouch 10 may be shaped to face inward. Even in this case, the gripping tab 22A can be grasped and the dispensing section 20A can be easily opened from the inside to the outside along the intended opening line 26. [Examples]

[0067] The present disclosure will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0068] The film laminate 30 was fabricated using the following materials (see Figure 4(a)). • Substrate layer: Unstretched HDPE film (thickness: 35 μm, density: 0.948 g / cm³) 3 (Melting point: 135℃) • Adhesive layer: Urethane-based adhesive • Sealant layer: C4-LLDPE (density: 0.916 g / cm³) 3 MFR: 4.0g / 10 min, melting point: 102℃) A film laminate 30 was obtained by bonding this sealant layer and the substrate layer via an adhesive layer (thickness: 1-2 μm).

[0069] Three of the aforementioned film laminates 30 were prepared and used as the main body (film laminates 30A, 30B) and the base material (base tape 40), respectively, to create a standing pouch (see Figure 2). The pouch sizes were as follows. ·Top and bottom: 230mm ·Width: 150mm • Fold width: 40mm More specifically, a standing pouch 10 with the configuration shown in Figures 1 and 5 was fabricated from the obtained film laminate 30. In the dispensing section 20 of this standing pouch 10, an opening line 26 was formed along the machine direction MD, which is easily tearable.

[0070] In the following experimental examples, the shape (dimensions) of the dispensing section 20 was changed to evaluate: 1) the ease of opening along the planned opening line 26, 2) whether or not the flow path 21b was blocked when the dispensing section 20 was opened and fitted into the container, and 3) the stability when inserted into the destination container. More specifically, in this test, the length D1 of the first dispensing seal section 23 and the length D2 of the second dispensing seal section 24 were changed, and the tests 1 to 3) described above were evaluated in experimental examples 1 to 14.

[0071] Ease of opening was evaluated by whether the gripping tab could be cut off. The presence or absence of flow path blockage was evaluated by whether the contents could be refilled without clogging. Insertion stability was evaluated by whether the standing pouch wobbled or the spout detached during refilling.

[0072] The evaluation results are shown in Table 1 below. [Table 1]

[0073] As shown in Table 1, by forming an opening line 26 along the easily tearable mechanical direction MD in the dispensing section 20 of the standing pouch 10, it was confirmed that opening performance could be improved while achieving monomaterial construction. Furthermore, it was confirmed that the straight length of the second dispensing seal section 24 being 5 mm to 10 mm prevented blockage of the flow path and provided suitable stability when fitted into a container. [Explanation of Symbols]

[0074] 10...Standing pouch (packaging bag), 11...Storage section, 12...Seal section, 12a...First seal section, 12b...Second seal section, 13...Injection section, 13a...Seal section, 20...Dispensing section, 21...Dispensing outlet, 21a...Opening, 22...Grip tab, 23...First dispensing seal section, 24...Second dispensing seal section, 25...Connecting seal section, 26...Opening line, 27...Notch, 30, 35, 30A, 30B...Film laminate, L1...Base layer, L2...Sealant layer, MD...Machine direction.

Claims

1. A packaging bag is formed by sealing a film laminate, comprising a base layer formed from polyethylene resin and a sealant layer formed from polyethylene resin, wherein the sealant layer has a mechanical direction (MD direction) and the sealant layer is easily tearable along the mechanical direction, A storage section capable of accommodating specified items, A sealing portion formed around the aforementioned housing portion, An inlet for injecting the aforementioned contents into the storage section, the inlet being sealed after injection, The container is provided at the corner of the container and includes a dispensing section that includes a spout from which the contents can be dispensed when the container is opened, The opening line defining the opening of the spout is aligned with the machine direction of the sealant layer, The dispensing section has a grip tab that closes the spout before opening the dispensing section and can be grasped by the user when opening the dispensing section, and a first dispensing seal section and a second dispensing seal section that define the spout, The first dispensing seal portion is provided on the outer edge side of the packaging bag, and the second dispensing seal portion is provided on the side of the injection portion, which is inside the first dispensing seal portion. One end of the gripping tab is connected to the upper end of the first dispensing seal portion on the planned opening line, and the other end of the gripping tab is connected to the upper end of the second dispensing seal portion on the planned opening line. The lower end of the second dispensing seal portion is connected to the seal portion on the dispensing portion side of the injection portion, The second dispensing seal portion is shorter than the first dispensing seal portion. A packaging bag in which the straight-line length from the lower end to the upper end of the second dispensing seal portion is 5 mm or more and 10 mm or less.

2. A notch is provided at one end of the opening line of the dispensing section. The packaging bag according to claim 1.

3. The width of the first dispensing seal portion and the second dispensing seal portion in the machine direction is 3 mm or more. The packaging bag according to claim 1 or 2.

4. The length of the second dispensing seal portion is shorter than half the length of the first dispensing seal portion, A packaging bag according to any one of claims 1 to 3.

5. The shortest distance between the second dispensing seal portion and the injection portion is 5 mm or less. A packaging bag according to any one of claims 1 to 4.

6. The sealing portion comprises a first sealing portion provided on one side of the housing portion and on the dispensing portion side, and a second sealing portion provided on the other side of the housing portion and on the side opposite to the first sealing portion in the machine direction. The first dispensing seal portion is connected to the first seal portion via a connecting seal portion. The angle between the outer edge of the first dispensing seal portion and the outer edge of the connecting seal portion is obtuse. A packaging bag according to any one of claims 1 to 5.

7. The stiffness of the film laminate in the mechanical direction is 200 mN / 15 mm or less. A packaging bag according to any one of claims 1 to 6.

8. The gripping tab protrudes outward from the packaging bag, A packaging bag according to any one of claims 1 to 7.

9. The polyethylene resin constituting the sealant layer is C4-LLDPE. A packaging bag according to any one of claims 1 to 8.

10. The polyethylene resin constituting the base layer is HDPE. A packaging bag according to any one of claims 1 to 9.

11. The aforementioned base layer is composed of an unstretched polyethylene resin film. A packaging bag according to any one of claims 1 to 10.

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