Laminate material for in-line molding container

Abstract

To provide a laminate material for an in-line molding container which improves protrusion workability when an in-line molding container is molded, enables molding of a comparatively large-sized in-line molding container, and can surely prevent generation of delamination in a laminate material forming a molding container by heat applied when a lid material is heat sealed after the in-line molding container has been filled with a content.SOLUTION: There is provided a laminate material 1 for an in-line molding container in which a base material layer 2 composed of a thermoplastic resin film, a barrier layer 3 composed of a metallic foil and a heat seal layer 4 are sequentially laminated. When the base material layer 2 is heated under a fixed heating condition, an absolute value between a contraction ratio (%) in a flow direction (MD) and a contraction ratio (%) in a width direction (TD) is 0.5% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminate material for producing in-line molded containers used in packaging for packaging foods, medicines, fine chemicals, etc.

[0002] In this specification and claims, the term "inline-molded container" refers to a container formed in a series of steps in a so-called inline method of manufacturing a package, in which a container laminate is subjected to bulging processing to form a container, the container is filled with contents, and then a lid material is heat-sealed around the opening periphery of the container to produce a package.

[0003] In this specification, the term "aluminum" includes aluminum alloys as well as pure aluminum. [Background technology]

[0004] A widely known package for packaging contents that need to be protected from gases, water vapor, light, etc., such as food, pharmaceuticals, and fine chemicals, is one that consists of a molded container formed using a laminated material with a barrier layer and containing the contents, and a lid material formed using a laminated material with a barrier layer and heat-sealed to the periphery of the opening of the molded container to close the opening of the molded container.

[0005] One known method for manufacturing the above-mentioned package is a so-called inline method, in which a laminated material having a barrier layer is cold-stretched to sequentially form a plurality of inline-molded containers, the contents are sequentially filled into each of the inline-molded containers, lid materials having a barrier layer are sequentially heat-sealed to the opening periphery of the inline-molded containers to form packages, and the packages are sequentially divided.

[0006] Patent Document 1 discloses a laminated material used in the production of inline molded containers when producing packaging bodies by the inline method described above, in which a biaxially oriented film made of a resin such as polyethylene terephthalate, nylon, or polypropylene, an aluminum foil, an adhesive layer, and a film made of polypropylene are laminated in this order. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 6-345123 Summary of the Invention [Problem to be solved by the invention]

[0008] However, as described in paragraph

[0027] of Patent Document 1 as having a "diameter of 29 mm x 33 mm and a depth of 6 mm," the molded containers produced from the laminated material disclosed in Patent Document 1 are quite small. Recently, there has been a demand for larger in-line molded containers, and in the manufacture of in-line packaging, it is necessary to improve the bulging processability when bulging the laminated material to form the in-line molded container. Furthermore, in the manufacture of in-line packaging, it is necessary to reliably prevent delamination of the laminated material forming the in-line molded container due to heat applied when heat-sealing the lid material after filling the contents into the in-line molded container.

[0009] In view of the above-mentioned circumstances, this invention aims to provide a laminate material for inline molded containers that improves the bulging processability when applying bulging processing to a laminate material to form an inline molded container in the inline manufacturing of packaging bodies, making it possible to form relatively large inline molded containers, and that can reliably prevent delamination from occurring in the laminate material that forms the molded container due to the heat applied when heat-sealing the lid material after filling the contents into the inline molded container. [Means for solving the problem]

[0010] In order to achieve the above object, the present invention comprises the following aspects.

[0011] 1) A laminate for in-line molded containers, which is used in the production of in-line molded containers and comprises a base layer made of a thermoplastic resin film, a barrier layer made of a metal foil, and a heat seal layer laminated in that order, A laminate for inline molding containers, in which when the base layer is heated under certain heating conditions, the absolute value of the difference between the shrinkage rate (%) in the machine direction (MD) and the shrinkage rate (%) in the transverse direction (TD) is 0.5 or less. Here, the shrinkage rate (%) when heated is calculated using the following formula. Shrinkage rate (%) = {(sample length before heating - sample length after heating) / sample length before heating} x 100 2) The depth of the in-line molding container to be produced is 10 to 20 mm, and the capacity is 50 to 400 cm 3 The laminate for in-line molding containers according to 1) above, wherein

[0012] 3) The laminate for in-line molding containers according to 1) above, wherein the base layer is formed of one film selected from the group consisting of biaxially oriented nylon film, unoriented polypropylene film, biaxially oriented polyethylene terephthalate film, and biaxially oriented polybutylene terephthalate film.

[0013] 4) The laminate for in-line molding containers according to 1) above, wherein the base layer is made of a biaxially oriented nylon film having a thickness of 9 to 40 μm, and when heated under certain heating conditions, the shrinkage percentages (%) in the machine direction (MD) and the transverse direction (TD) are both 1.5% or less, the barrier layer is made of aluminum foil having a thickness of 60 to 140 μm, and the heat seal layer is made of an unstretched polypropylene film having a thickness of 40 to 200 μm.

[0014] 5) The laminate for in-line molding containers according to 1) above, wherein a surface treatment is performed on the surface of the barrier layer facing the base material layer.

[0015] 6) The laminate for in-line molding containers according to 1) above, wherein an adhesive layer is provided between the base material layer and the barrier layer, and the adhesive layer is made of a two-component curing urethane adhesive. [Effects of the Invention]

[0016] According to the laminated materials for in-line molded containers described in 1) to 6) above, when the base layer is heated under certain heating conditions, the absolute value of the difference between the shrinkage percentage (%) in the machine direction (MD) and the shrinkage percentage (%) in the transverse direction (TD) is 0.5 or less. Therefore, when the laminated material is bulged to form an in-line molded container in an in-line manufacturing process, a uniform force is applied to the metal foil forming the barrier layer, improving bulging processability and enabling the molding of relatively large in-line molded containers. Furthermore, during in-line manufacturing of packages, it is possible to reliably prevent delamination of the laminated material forming the molded container due to heat applied when heat-sealing the lid after filling the contents into the in-line molded container. Furthermore, it is possible to reliably prevent delamination of the laminated material forming the in-line molded container when retorting the food packaged in the package.

[0017] As described in 2) above, the depth of the in-line molding container to be produced is 10 to 20 mm, and the capacity is 50 to 400 cm 3 Even if the container is relatively large, the laminate for inline molded containers described above in 1) makes it possible to use the laminate to bulge mold inline molded containers by bulging processing in the inline manufacturing of packaging bodies.

[0018] The laminate for in-line molded containers of the above 3) provides good moldability and water resistance, and also improves the rigidity of the molded in-line molded containers.

[0019] The laminate for in-line molded containers described in 4) above provides good moldability, and even when the molded in-line molded container is used to fill the contents and the package, which is then heat-sealed with a lid, is subjected to a heat sterilization treatment, there is less warping of the flange portion of the in-line molded container toward the base layer side (bottom wall side).

[0020] The laminated materials for inline molded containers described in 5) and 6) above can provide good moldability and can also suppress the occurrence of delamination when a package formed by filling a content using a molded inline molded container and heat-sealing the lid is subjected to a heat sterilization treatment. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is an enlarged cross-sectional view showing a laminate for in-line molding containers according to the present invention. [Figure 2] 1 is a plan view showing one specific example of an in-line molded container formed by bulging processing using a laminate for in-line molded containers according to the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line XX in FIG. 2. [Figure 4] 1A and 1B show formed containers formed by bulging processing using laminated materials according to examples of the present invention and comparative examples, where (a) is a plan view and (b) is a cross-sectional view taken along line YY in (a). DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the technical scope of the present invention is not limited to the embodiments shown in the drawings.

[0023] FIG. 1 shows a laminate for in-line formed containers according to the present invention, and FIGS. 2 and 3 show in-line formed containers formed using the laminate of FIG. 1 in the process of manufacturing packaging by an in-line method.

[0024] In Fig. 1, the laminate material for in-line molding containers (1) is a composite material in which a substrate layer (2) made of a thermoplastic resin film, a barrier layer (3) made of a metal foil, and a heat-seal layer (4) are laminated in this order from one side. Adhesive layers (5) and (6) are interposed between the substrate layer (2) and the barrier layer (3) and between the barrier layer (3) and the heat-seal layer (4), respectively.

[0025] 2 and 3 show an in-line molded container formed using the laminated material (1) of FIG.

[0026] 2 and 3, the in-line molded container (10) comprises a container body (11) having a bottom wall (12) and a peripheral wall (13) formed integrally and rising from the periphery of the bottom wall (12) and having an opening (14) surrounded by the upper end of the peripheral wall (13), and an outward flange (15) formed integrally at the upper end of the peripheral wall (13). The bottom wall (12) and opening (14) of the container body (11) are approximately rectangular in shape when viewed from above, with rounded corners (16) and (17). A rounded corner (18) is also formed at the junction between the bottom wall (12) and peripheral wall (13) of the container body (11). The outer peripheral edge of the outward flange (15) is rectangular in shape when viewed from above. In this embodiment, in the process of manufacturing a package by the inline method, four inline-formed containers (10) are arranged two by two vertically and horizontally and connected together by flanges (15) to form a multiple-connected structure. The connecting portions between the flanges (15) of the inline-formed containers (10) are indicated by (C). For example, when the contents are foodstuffs, the depth of the container body (11) of each inline-formed container (10) is 10 to 20 mm, and the capacity is 50 to 400 cm. 3 It is preferable that:

[0027] The base material layer (2) of the laminate material (1) for inline molded containers forms the outermost surfaces of the bottom wall portion (12) and peripheral wall portion (13) of the container body (11) of each inline molded container (10) and the lowermost surface of the flange portion (15), and the heat seal layer (4) forms the innermost surfaces of the bottom wall portion (12) and peripheral wall portion (13) of the container body (11) of each inline molded container (10) and the uppermost surface of the flange portion (15).

[0028] Hereinafter, each of the layers (2) to (6) of the laminate for in-line molding containers (1) will be described in detail. [Base material layer (2)] The base material layer (2) is a layer that improves bulging processability when the laminate material for in-line molded containers (1) is bulged to form the in-line molded container (10), and also suppresses delamination between the base material layer (2) and the barrier layer (3) due to heat when a lid material is heat-sealed to the in-line molded container (10), and the thickness of the base material layer (2) is preferably 9 to 40 μm. If the thickness of the base material layer (2) is less than 9 μm, the barrier layer (3) may break during molding, and if it exceeds 40 μm, the residual stress during molding of the container may become too high, causing delamination between the base material layer (2) and the barrier layer (3).

[0029] The thermoplastic resin film forming the base layer (2) is limited to one in which the absolute value of the difference between the shrinkage percentage (%) in the machine direction (MD) and the shrinkage percentage (%) in the transverse direction (TD) is 0.5 or less when the base layer (2) (thermoplastic resin film) is heated under certain heating conditions, for example, at 160°C for 10 minutes. Here, the shrinkage percentage (%) upon heating is calculated using the following formula: Shrinkage rate (%) = {(sample length before heating - sample length after heating) / sample length before heating} x 100

[0030] The thermoplastic resin film forming the base layer (2) is one selected from the group consisting of biaxially oriented nylon film, unstretched polypropylene film, biaxially oriented polyethylene terephthalate film, and biaxially oriented polybutylene terephthalate film. Among these, it is preferable to form the base layer (2) from a biaxially oriented nylon film that has a shrinkage rate (%) of 1.5% or less in both the machine direction (MD) and the transverse direction (TD) when heated under certain heating conditions, for example, at 160°C for 10 minutes.

[0031] The surface of the substrate layer (2) on the barrier layer (3) side is preferably subjected to an easy-adhesion treatment using an adhesive composition for forming an easy-adhesion layer, which contains a base material such as a polyamide resin, a polyester resin, a water-based polyurethane resin, or an acrylic acid resin, a crosslinking agent such as a water-soluble epoxy resin or a water-soluble oxazoline, and a coating agent (average particle size 0.001 to 1.0 μm) mainly composed of fine particles such as colloidal silica.

[0032] [Barrier layer (3)] The barrier layer (3) is a layer that protects the contents of a package having an in-line forming container (10) formed from the laminate for in-line forming containers (1) from gas, water vapor, light, etc. and is made of metal foil formed from metals such as aluminum, copper, iron (stainless steel), titanium, and nickel. However, aluminum foil is preferred in consideration of processability, barrier function, cost, etc. to ensure the required depth of the in-line forming container (10). As the aluminum foil, a foil made of a soft aluminum material (O material) of 1000 series or 8000 series as specified in JIS H4160:1994 and having a thickness of 60 to 140 μm is preferred. If the thickness of the aluminum foil forming the barrier layer (3) is less than 60 μm, the strength and rigidity of the in-line forming container (10) may be insufficient, and if it exceeds 140 μm, formability may be impaired.

[0033] The aluminum foil forming the barrier layer (3) is preferably an aluminum foil made of an Al-Fe alloy containing 0.7 to 1.7% by mass of Fe, specifically, an A8021H-O material or an A8079H-O material as specified in JIS H4160:1994. The content of Si as an impurity in an Al-Fe alloy containing 0.7 to 1.7% by mass of Fe is preferably 0.1% by mass or less. When an aluminum foil made of an Al-Fe alloy containing 0.7 to 1.7% by mass of Fe is used as the barrier layer (3), the processability during bulging of the in-line forming container (10) is improved, the occurrence of wrinkles in the bottom wall portion (12) and the peripheral wall portion (13) of the container body (11) is suppressed, and sufficient flatness of the flange portion (15) is ensured. Furthermore, as shown in FIG. 2, even when a plurality of in-line molded containers (10) are connected in a multiple-connection configuration, the occurrence of wrinkles in the bottom wall portion (12) and the peripheral wall portion (13) of the container body (11) is suppressed, and sufficient flatness of the flange portion (15) is ensured.

[0034] It is preferable that at least the surface of the barrier layer (3) facing the base layer (2) be subjected to a surface treatment such as a chemical conversion treatment. By subjecting at least the surface of the barrier layer (3) facing the base layer (2), the adhesion between the barrier layer (3) and the adhesive layer (5) after the bulging process can be strengthened, ensuring sufficient formability and sufficiently preventing delamination between the base layer (2) and the barrier layer (3) when the resulting in-line formed container (10) is filled with contents and the lid is heat-sealed and the resulting package is subjected to a heat sterilization process. The surface of the barrier layer (3) facing the heat-seal layer (4) may also be subjected to a chemical conversion treatment. In this case, the adhesion between the barrier layer (3) and the adhesive layer (6) after the bulging process can be strengthened, achieving the same effect as described above.

[0035] The above-mentioned chemical conversion treatment is carried out by, for example, applying the following to the surface of the barrier layer (3) made of a metal foil that has been subjected to a degreasing treatment: 1) an aqueous solution consisting of a mixture of metal salts of phosphoric acid, chromic acid and fluoride; 2) an aqueous solution consisting of a mixture of metal and non-metal salts of phosphoric acid, chromic acid, and fluoride; and 3) An aqueous solution consisting of a mixture of acrylic resin and / or phenolic resin, phosphoric acid, chromic acid, and a metal fluoride salt. The coating is carried out by applying any one of the above and then drying.

[0036] [Heat seal layer (4)] The heat seal layer (4) is made of a polyolefin resin, such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), homopolypropylene (hPP), ethylene-propylene random copolymer (rPP), or ethylene-propylene block copolymer (bPP). These resins may be used alone or in combination. These resins may be used in single-layer or multi-layer configurations. Among these, a three-layer unstretched polypropylene film consisting of a bPP film sandwiched between rPP films is preferred.

[0037] The thickness of the heat seal layer (4) is preferably 40 to 200 μm. If the thickness of the heat seal layer (4) is less than 40 μm, the internal pressure strength may be insufficient, while if it is more than 200 μm, the cost will be high and the aluminum ratio will be low, which may reduce recyclability after use. The internal pressure strength is measured by inserting a needle into a package filled with contents or water and sealed, fixing it in place to prevent air leakage, connecting a pressure gauge and compressor to the needle, operating the compressor, and sending air at a flow rate of 1±0.2 L per minute, and reading the maximum pressure when the package bursts.

[0038] [Adhesive layer (5)(6)] The adhesive layer (5) between the substrate layer (2) and the barrier layer (3) is formed of, for example, an ester-based two-component curing urethane adhesive, an acid-modified polypropylene adhesive, or the like.

[0039] The adhesive layer (6) between the barrier layer (3) and the heat seal layer (4) is formed of, for example, an ester-based two-component curing urethane adhesive, an acid-modified polypropylene adhesive, or the like.

[0040] Next, examples of the present invention and comparative examples will be described. [Example 1] As the thermoplastic resin film forming the base layer (2), a biaxially oriented nylon film having a thickness of 25 μm and a shrinkage rate (%) of 0.9% in the machine direction (MD) and 1.0% in the transverse direction (TD) when heated at 160°C for 10 minutes, with the absolute value of the difference between the shrinkage rates being 0.1, was prepared. As the metal foil forming the barrier layer (3), an 80 μm thick aluminum foil made of A8021H-O material specified in JIS H4160:1994 was prepared. As the heat-sealable resin forming the heat-seal layer (4), an 80 μm thick unstretched polypropylene film was prepared.

[0041] Next, 3.5 g / m of an ester-based two-component curing urethane adhesive was applied to one side of the aluminum foil that would become the barrier layer (3). 2 The adhesive is used to bond a biaxially oriented nylon film that will become the base layer (2), and an ester-based two-component curing urethane adhesive is applied at 3.5 g / m to the other side of the aluminum foil that will become the barrier layer (3). 2 The adhesive was used to bond an unstretched polypropylene film that would become the heat seal layer (4), thus producing a laminate material (1) for in-line molded containers.

[0042] [Example 2] As the thermoplastic resin film forming the base layer (2), a biaxially oriented nylon film having a thickness of 25 μm and a shrinkage rate (%) of 0.8% in the machine direction (MD) and 1.3% in the transverse direction (TD) when heated at 160°C for 10 minutes, with the absolute value of the difference between the two being 0.5, was prepared. As the metal foil forming the barrier layer (3), an 80 μm thick aluminum foil made of A8021H-O material specified in JIS H4160:1994 was prepared. As the heat-sealable resin forming the heat-seal layer (4), an 80 μm thick unstretched polypropylene film was prepared.

[0043] A chemical conversion treatment solution (pH = 1) consisting of polyacrylic acid, a trivalent chromium compound, phosphoric acid, pure water, and isopropyl alcohol was prepared. Furthermore, 70 parts by weight of Mitsui Chemicals' "Takelac W-6010" water-based urethane resin, 30 parts by weight of Nagase Chemtec's "Denacol EX-521" water-based epoxy resin, and 5 parts by weight of Nissan Chemical Industries' "Snowtex ST-C" colloidal silica (average particle size 10-20 nm) as an antiblocking agent were mixed and diluted with ion-exchanged water to prepare an adhesive composition for forming an easy-adhesion layer with a nonvolatile content of 2% by weight.

[0044] The adhesive for forming the easy-adhesion layer was applied to the surface of the biaxially oriented nylon film forming the base layer (2) to be adhered to the barrier layer (3) using a gravure coater to a thickness of 0.2 μm, and then dried to form an easy-adhesion layer. The chemical conversion treatment solution was applied to both sides of the aluminum foil forming the barrier layer (3), and then dried at 180° C. to form a chromium coating amount of 10 mg / m 2 The film was subjected to a chemical conversion treatment so that the film was as follows:

[0045] Next, 3.5 g / m of an ester-based two-component curing urethane adhesive was applied to one side of the aluminum foil that would become the barrier layer (3). 2The adhesive is used to bond a biaxially oriented nylon film that will become the base layer (2), and an ester-based two-component curing urethane adhesive is applied at 3.5 g / m to the other side of the aluminum foil that will become the barrier layer (3). 2 The adhesive was used to bond an unstretched polypropylene film that would become the heat seal layer (4), thus producing a laminate material (1) for in-line molded containers.

[0046] [Comparative Example] A laminate material (1) for inline molding containers was produced in the same manner as in Example 1 above, except that a biaxially oriented nylon film having a thickness of 25 μm, which had a shrinkage rate (%) of 1.9% in the machine direction (MD) and a shrinkage rate (%) of 0.5% in the transverse direction (TD) when heated at 160°C for 10 minutes, with the absolute value of the difference between the two being 1.4, was used as the thermoplastic resin film forming the base layer (2).

[0047] [Evaluation test] Dry Laminate Strength The laminated materials (1) for inline molding containers of Examples 1-2 and Comparative Examples were cut into strips with a width of 15 mm, and a T-peel test was carried out in a dry atmosphere according to the method specified in JIS-K-6854-3 (T-peel) 6.4b, at a peel rate of 100 mm / min, to measure the dry laminate strength between the base layer (2) and the barrier layer (3).

[0048] Wet Laminate Strength The laminated materials (1) for in-line molding containers of Examples 1-2 and Comparative Examples were cut into strips with a width of 15 mm and subjected to retort treatment. Thereafter, a T-peel test was carried out in a humid atmosphere according to the method specified in JIS-K-6854-3 (T-peel), section 6.4 b, and the wet laminate strength between the base layer (2) and the barrier layer (3) was measured at a peel rate of 100 mm / min.

[0049] Stretchability The containers (100) shown in Fig. 4 were molded by applying bulging processing to the laminates (1) for in-line molding containers of Examples 1-2 and the Comparative Example. The containers (100) each comprise a bottom wall (120) and a peripheral wall (130) formed integrally and rising from the periphery of the bottom wall (120), a container body (110) having an opening (140) surrounded by the upper end of the peripheral wall (130), and an outward flange (150) provided at the upper end of the peripheral wall (130) and having an outer peripheral edge with a rectangular shape when viewed from above. The bottom wall (120) of the container body (110) has a rectangular shape measuring 110 mm x 60 mm in plan view, with the corners rounded (160) with a radius of curvature of 15 mm, the opening (140) has a rectangular shape measuring 130 mm x 80 mm in plan view, with the corners rounded (170) with a radius of curvature of 25 mm, and the flange (150) has a rectangular shape measuring 150 mm x 100 mm in plan view. The longitudinal directions of the bottom wall (120), opening (140), and flange (150) are all oriented in the same direction. The depth of the container body (110) is 18 mm, and a curve (180) with a radius of curvature of 10 mm is formed between the bottom wall (120) and the peripheral wall (130) of the container body (110), and a curve (190) with a radius of curvature of 1 mm is formed between the peripheral wall (130) and the flange (150) of the container body (110). Furthermore, the internal volume of the container is 150 cm 3 is.

[0050] Then, whether or not breakage occurred in the laminated material (1) during the bulging process of the container was observed, and the bulging processability was evaluated.

[0051] Heat resistance during heat sealing The molded container was heated and pressurized for 30 seconds at 200°C and a pressure of 0.1 MPa, which are the same heating conditions as those used when heat-sealing the lid material to the flange portion (150) of the container, and the occurrence of delamination between the base layer (2) and the barrier layer (3) was examined.

[0052] The results of the above evaluation tests are summarized in Table 1.

[0053] Heat resistance during retort processing The molded container was subjected to a retort treatment at 120°C for 3 minutes, and the occurrence of delamination between the base layer (2) and the barrier layer (3) was examined.

[0054] [Table 1]

[0055] In Table 1, in the column for stretchability, ○ indicates that no fracture occurred in the laminate (1) during stretching, and × indicates that fracture occurred. The occurrence of fracture was determined visually. In the column for heat resistance during heat sealing, ○ indicates that no delamination occurred between the base layer (2) and the barrier layer (3) after heating, and × indicates that delamination occurred in the portion indicated by A in Figure 4. In the column for heat resistance during retort, ○ indicates that no delamination occurred between the base layer (2) and the barrier layer (3) after heating, and × indicates that delamination occurred in the portion indicated by A in Figure 4 and in the flange portion, which is the non-molded portion.

[0056] As is clear from Table 1, the laminate materials (1) for inline molded containers of Examples 1 and 2, in which the absolute value of the difference between the shrinkage rate (%) in the machine direction (MD) and the shrinkage rate (%) in the transverse direction (TD) when heated at 160°C for 10 minutes is 0.5 or less, are superior to the comparative examples in lamination strength, bulging processability, and delamination resistance after heating in a dry atmosphere and in a humid atmosphere after heat treatment. [Industrial Applicability]

[0057] The laminate for inline molded containers according to the present invention is suitable for use in the production of inline molded containers by bulging processing in a series of steps in the so-called inline method of manufacturing packaging, which involves forming an inline molded container by bulging processing, filling the contents into the inline molded container, and heat sealing a lid material around the opening periphery of the inline molded container to produce a package. [Explanation of symbols]

[0058] (1): Laminated material for in-line molding containers, (2): Base material layer, (3): Barrier layer, (4): Heat seal layer, (10): In-line molding container

Claims

1. A laminate for in-line molded containers, which is used in the production of in-line molded containers and comprises a base layer made of a thermoplastic resin film, a barrier layer made of a metal foil, and a heat seal layer laminated in that order, A laminate for inline molding containers, wherein when the base material layer is heated under certain heating conditions, the absolute value of the difference between the shrinkage rate (%) in the machine direction (MD) and the shrinkage rate (%) in the width direction (TD) is 0.5 or less.

2. The depth of the in-line molding container to be produced is 10 to 20 mm, and the capacity is 50 to 400 cm ３ 2. The laminate for in-line molding containers according to claim 1, wherein

3. 2. The laminate for in-line molding containers according to claim 1, wherein the base layer is formed of one film selected from the group consisting of biaxially oriented nylon film, unoriented polypropylene film, biaxially oriented polyethylene terephthalate film, and biaxially oriented polybutylene terephthalate film.

4. 2. The laminate for in-line molding containers according to claim 1, wherein the base layer is made of a biaxially oriented nylon film having a thickness of 9 to 40 μm, and when heated under certain heating conditions, the shrinkage percentages (%) in both the machine direction (MD) and the width direction (TD) are 1.5% or less; the barrier layer is made of aluminum foil having a thickness of 60 to 140 μm; and the heat seal layer is made of an unstretched polypropylene film having a thickness of 40 to 200 μm.

5. 2. The laminate for in-line molding containers according to claim 1, wherein a surface treatment is performed on the surface of the barrier layer facing the base material layer.

6. 2. The laminate for in-line molding containers according to claim 1, wherein an adhesive layer is provided between the base layer and the barrier layer, and the adhesive layer is made of a two-component curing urethane adhesive.

Images