TW202330238A - Molded container - Google Patents

Abstract

A cup-shaped molded container (2) formed by pressing a laminated packaging material (1) provided with: a barrier layer (13); a protective layer (16) comprising a synthetic resin film in which the tensile strength ([delta]1(MD)) and ([delta]1(MD)) in each of a flow direction (MD) and a width direction (TD) is 500-2500 MPa and in which the ratio therebetween ([delta]1(MD)/[delta]1(TD)) is 0.9-1.1, the protective layer (16) covering one surface of the barrier layer (13); and a sealant layer (11) for covering the other surface of the barrier layer (13). An identification mark (15) is printed in advance using printing ink on at least the barrier-layer (13)-side surface of the protective layer (13). The molded container (2) has excellent moldability as well as excellent dimensional stability in regard to the identification mark (15) displayed thereon.

Description

shaped container

The present invention relates to a shaped container, and more specifically, for example, to a cup-shaped shaped container formed by pressing a laminated packaging material including a barrier layer made of a metal foil such as aluminum foil.

In this specification and the scope of the patent application, "inside" refers to the inside of the containing part of the shaped container of the present invention that contains the content, and "outside" refers to the opposite side. Also, the direction shown by the arrow Z in FIG. 1( a ) is called up, and the opposite side is called down. Furthermore, the term "aluminum" includes aluminum alloys in addition to pure aluminum.

As a sealed package for storing contents such as food, pharmaceuticals, sanitary products, and electronic parts (hereinafter referred to as contents), for example, it is composed of a molded container and a cover material. The molded container is composed of a main body, The bottom is surrounded by the bottom edge of the lower end of the main body and is open upward to accommodate the contents of the cup, and the outer flange is integrally provided on the upper end of the main body and faces outward. The outer peripheral edge of the cover is glued It is fixed on the flange of the molded container to cover the opening of the molded container.

The formed container of the above-mentioned package is generally manufactured by pressing a laminated packaging material with the protective layer facing outward. A synthetic resin film is laminated as a protective layer on one side of the barrier layer, and a synthetic resin film is laminated as a sealing layer on the other side of the barrier layer, and its effect of blocking light, moisture, oxygen, etc. is excellent, and it is low cost and lightweight And high strength.

Among the above-mentioned packages, a heat-seal type package in which the outer peripheral portion of the lid material is heat-sealed to the flange portion of the molded container is excellent in terms of airtightness. An example of such a heat-sealable package is disclosed in Patent Document 1. The packaging system described in Patent Document 1 is a packaging body composed of a shaped container with a flange and a lid. The shaped container with a flange is made of polyethylene terephthalate film, aluminum foil, modified polypropylene film and A laminated packaging material in which polypropylene films are sequentially dry-laminated and molded with the polypropylene film on the innermost side. The cover is a cover laminate in which at least one side of the barrier layer formed by aluminum foil is covered with a sealing layer. and its outer peripheral portion is heat-sealed to the flange portion of the shaped container in such a way as to cover the opening of the shaped container.

In addition, identification marks recognizable from the outside may be formed on molded containers for various purposes. For example, identification marks such as characters, graphics, marks, patterns, etc. can be formed on the outer surface of the main body of the shaped container by any means, so as to indicate the name and description (quality, ingredients, precautions, etc.) Design composition, logo. Then, the label can give the package a degree of recognition, improve the willingness of consumers to purchase, or guarantee the quality of the contents.

As a means of forming the identification mark on the shaped container, someone thought of attaching the sheet material with the identification mark printed in advance on the outer surface of the shaped container, or by printing on the outer surface of the shaped container to form the identification mark method, but All are not economical because of the complicated procedures and the need for special equipment. Therefore, a material with an identification mark recognizable from the outside of the protective layer printed in advance on a light-transmitting synthetic resin film serving as the protective layer of the shaped container is prepared as a laminated packaging material, and the laminated packaging material is used as the protective layer. The synthetic resin film is placed in a press mold so that it becomes the outside, and is subjected to, for example, deep-drawing processing, whereby a shaped container having an identification mark that can be recognized from the outside is manufactured. The aforementioned identification mark is mostly formed on the main body of the shaped container, but it may also be formed on the bottom or the flange depending on the purpose. [Prior Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 2866916

[Problem to be solved by the invention]

In addition, when the blank of the laminated packaging material with the identification mark printed on the synthetic resin film as the protective layer is pressed to produce a shaped container with a flange, the laminated packaging material expands and contracts according to the shape of the mold. , so the following problem occurs. That is, for example, in order to obtain a formed container with a flange, the laminated packaging material is subjected to deep drawing processing. In the laminated packaging material, the compressive force will act on the area corresponding to the flange portion of the formed container. Apply substantial stretch to the body and bottom of the body. As a result, the identification mark printed on the synthetic resin film serving as the protective layer of the laminated packaging material will also expand and contract to a corresponding extent. As a result, identification marks are greatly distorted, broken, mottled, and smudged.

Therefore, in order to prevent the identification mark from being greatly distorted, broken, mottled and smeared, when the identification mark is printed on the synthetic resin film as a protective layer, it must be considered that the identification mark will be greatly deformed during pressing. It is then also necessary to specify which shape the identification mark will assume in the shaped container after pressing. As a direct means to solve this problem, it is possible to optimize the design and control program of a machine for printing an identification mark on a synthetic resin film. However, due to cumbersome procedures and cost issues, it is hard to say it is the best.

In addition, if the laminated packaging material with the identification mark printed on the synthetic resin film as the protective layer is pressed, a strong stress will act on the laminated packaging material, and the thickness of the resulting formed container may also be affected. Stratification occurs in the middle of the direction. Also, if the synthetic resin film used as the protective layer of the laminated packaging material is too hard, the laminated packaging material will not be sufficiently stretched during press processing, and the height (depth of the housing portion) of the resulting molded container may not be ensured.

The first object of the present invention is to provide a shaped container on which the identification mark will not be twisted or mottled, or the distortion or mottled will be small, and the dimensional stability (hereinafter also referred to as the dimensional stability of the identification mark) is good. .

In addition, the second object of the present invention is to provide a molded container which can be molded without delamination in the middle of the thickness direction between the main body and the bottom of the container, and which can sufficiently secure the height of the body (the depth of the container). Properties (hereinafter also referred to as container formability) are good. [Means to solve the problem]

The inventors of the present invention conducted various researches and found that the above two objects can be achieved by optimizing the physical properties of a synthetic resin film as a protective layer of a laminated packaging material, and thus completed the present invention, which consists of the following aspects .

1) A shaped container comprising a body part and a bottom surrounded by the lower end of the body part, and an accommodating part opening upwards to accommodate contents, by having a barrier layer formed of metal foil and covering the barrier layer A laminated packaging material comprising a sealing layer on one side and a protective layer formed of a synthetic resin film and covering the other side of the barrier layer, which is formed by pressing the protective layer toward the outside of the main body and bottom of the container; Tensile strength (δ1(MD)) of the aforementioned synthetic resin film as the aforementioned protective layer in the aforementioned laminated packaging material in the direction of travel (MD) and tensile strength in the direction of width _{( TD )} (δ1 _{( TD )} ) All are 500Mpa～2500Mpa, and these ratios (δ1 _{( MD )} /δ1 _{( TD )} ) are 0.9～1.1, the surface of the above-mentioned synthetic resin film facing at least the side of the barrier layer can be synthesized from the above-mentioned by printing ink The method of identifying the other side of the resin film is to form an identification mark composed of at least any one of characters, figures, symbols and patterns, and at least one of the aforementioned body portion and the aforementioned bottom portion of the aforementioned housing portion , marked with the aforementioned identification mark in a manner recognizable from the outside.

2) The molded container as in 1) above, wherein the synthetic resin film has a tensile strength at break (δ2 _{( MD )} ) in the direction of travel (MD) and a tensile strength at break (δ2) in the width direction (TD). _{( TD )} ) are all 30Mpa ~ 70Mpa, and the ratio (δ2 _{( MD )} /δ2 _{( TD )} ) is 0.9 ~ 1.1.

3) The molded container as in 1) above, wherein the tensile elongation at break (E _{( MD )} ) of the aforementioned synthetic resin film in the direction of travel (MD) and the tensile elongation at break in the width direction (TD) (E _{( TD )} ) are both 500% to 900%, and their ratio (E _{( MD )} /E _{( TD )} ) is 0.8 to 1.2.

4) The molded container as in 1) above, wherein the heating dimensional change rate (CTE ₍ MD ₎ ) of the aforementioned synthetic resin film in the direction of travel ( _MD ) is -2.0% to 1.5% under the measurement conditions of 90°C and 30 minutes , and its heating dimensional change rate (CTE ₍ TD ₎ ) in the width direction ( _TD ) is -1.5% to 1.5% under the same measurement conditions, and the difference between these (CTE _{( MD )} -CTE _{( TD )} ) The absolute value is below 1.5%.

5) The molded container according to 1) above, wherein only one of the two sides of the aforementioned synthetic resin film has the identification mark formed thereon, and the coefficient of dynamic friction of the other side not formed with the same identification mark is 0.1 to 0.5.

6) The molded container according to 1) above, wherein the aforementioned synthetic resin film is a single-layer or multi-layer film formed of polyolefin.

7) The molded container according to 1) above, wherein an adhesive layer is present between the barrier layer and the protective layer.

8) A package comprising: a shaped container comprising the shaped container according to any one of 1) to 7) above, and the contents are accommodated in the container; and a cover covering the container of the shaped container. The opening of the part is heat-sealed to the upper end of the body part of the aforesaid accommodating part.

9) A method of manufacturing a shaped container, which is a method of manufacturing a shaped container including a body portion and a bottom surrounded by the lower end periphery of the body portion and an accommodating portion that opens upward to accommodate contents, wherein,

A laminated packaging material having a barrier layer formed of metal foil, a sealing layer covering one side of the aforementioned barrier layer, and a protective layer formed of a synthetic resin film and covering the other side of the aforementioned barrier layer is prepared as the aforementioned laminated packaging material. The above-mentioned synthetic resin film for the protective layer is made of a tensile strength (δ1 ₍ MD)) in the direction of travel ( _{MD )} and a tensile strength (δ1 ₍ TD)) in the width direction ( _{TD )} of 500Mpa to 2500Mpa and When these ratios (δ1 _{( MD )} /δ1 _{( TD )} ) are 0.9 to 1.1, at least the surface facing the barrier layer side of the aforementioned synthetic resin film can be turned from the aforementioned synthetic resin film toward the other side by printing ink. The side surface is identified by forming an identification mark composed of at least any one of characters, graphics, symbols and patterns, and the aforementioned protective layer is pressed to the outside of the main body and bottom of the housing. [Effect of the invention]

In the molded container of 1) above, the synthetic resin film used as the protective layer of the laminated packaging material has the following characteristics: its tensile strength (MPa) in the direction of travel (MD) and in the direction of width (TD) ( Hereinafter, it is also referred to as feature composition 1). That is, the tensile strengths of both are limited to the same range, and the ratio of the tensile strengths of both is also limited to a predetermined range.

Therefore, if this synthetic resin film is sent to a rotary machine for printing identification marks, although it is stretched in the direction of travel (MD), because the aforementioned synthetic resin film has the aforementioned characteristic configuration 1, it is relatively restrained from stretching in the MD direction. extension. On the other hand, the laminated packaging material having the synthetic resin film on which the identification mark is printed as the protective layer is properly stretched during the forming process when it is fed into the press mold.

Then, with such a combination of growth and decline, the formed container of the above-mentioned 1) has good container formability, and the marked identification mark has no distortion or deviation, and the dimensional stability of the identification mark is also good. In addition, regarding the identification mark, the ink layer forming it has no mottling, smearing, cracking, etc. or less, and the printability (hereinafter also referred to as identification mark printability) is also good.

In the molded container of 2), the synthetic resin film used as the protective layer of the laminated packaging material further has the following characteristics: its tensile strength at break in the direction of travel (MD) and the direction of width (TD), That is, the breaking point tensile strength (MPa) (hereinafter also referred to as characteristic composition 2). That is, the tensile strength at break of both is limited to the same range, and the ratio of the tensile strength at break between the two is limited to a predetermined range, so it is ideal to have both container formability and identification mark dimensional stability, identification mark printing Sex is also good.

3) In the molded container, the synthetic resin film used as the protective layer of the laminated packaging material further has the following characteristics: its tensile elongation at break in the direction of travel (MD) and the direction of width (TD) , that is, the tensile elongation at breaking point (%) (hereinafter also referred to as characteristic composition 3). That is, the tensile elongation of the two is limited to the same range, and the ratio of the tensile strength of the two is also limited to a predetermined range, so it is ideal to have both the container formability and the dimensional stability of the identification mark, and the printability of the identification mark. good.

In the molded container of 4), the synthetic resin film used as the protective layer of the laminated packaging material further has the following characteristics: Its heating dimensional change rate (%) in the direction of travel (MD) and the direction of width (TD) (hereinafter also referred to as feature composition 4). That is, the heating dimensional change rates of the two are limited within a predetermined range, and the absolute value of the difference between the two heating dimensional change rates is also limited within a predetermined range. Therefore, the aforementioned synthetic resin film stretches and shrinks evenly in the traveling direction (MD) and width direction (TD) as a whole even if it is heated during the ink drying step after the identification mark is printed, and the identification mark will not be damaged. (Print layer) Adhesion force with respect to the said synthetic resin film. As a result, the molded container of the above 4) also ideally has both container formability and identification mark dimensional stability, and the identification mark printability is also good.

5) Among the two sides of the synthetic resin film used as the protective layer of the laminated packaging material, only one side is formed with the identification mark, and the dynamic friction coefficient of the side without the same identification mark is limited to a predetermined range. Therefore, the aforementioned synthetic resin film exhibits appropriate smoothness and extensibility during press processing to form a shaped container, ideally having both container formability and identification mark dimensional stability. In addition, no local load is excessively applied to the aforementioned synthetic resin film, and the identification mark is free from distortion, breakage, mottling, blurring, etc., so the printability of the identification mark is also good.

6) In the molded container, the synthetic resin film used as the protective layer of the laminated packaging material is a single-layer or multi-layer film formed of polyolefin, so it is ideal to have both container formability and identification mark dimensional stability, identification Logo printability was also good.

7) In the formed container, the adhesive layer is present between the barrier layer and the protective layer of the laminated packaging material used, so delamination near the identification mark can be suppressed, and the formability of the container is particularly good. In addition, the dimensional stability of the identification mark and the printability of the identification mark are also excellent.

According to the package of 8), the dimensional stability and printability of the identification mark marked on the molded container were good.

According to the manufacturing method of the shaped container of 9), the shaped container of the above-mentioned 1) can be formed relatively easily under the condition that the dimensional stability of the identification mark and the printing characteristics of the identification mark are ensured.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3 . However, FIG. 1 to FIG. 3 do not limit the scope of the present invention.

Fig. 1 shows a specific example of the shaped container of the present invention, Fig. 2 shows a specific example of a package using the shaped container of the present invention, and Fig. 3 shows a laminated packaging material used in the manufacture of the shaped container of the present invention A specific example.

In Fig. 1, the shaped container (2) has a housing part (20) and a flange part (22), and the housing part (20) is a bottom surrounded by a body part (23) and the lower end periphery of the body part (23) (24), and open upwards to accommodate the contents, the flange portion (22) is integrally formed on the upper end of the main body portion (23) toward the outside at the peripheral portion of the opening (21) of the accommodating portion (20) to form an outward In a protruding shape, an identification mark (15) recognizable from the outside is formed on the outer surface of the main body (23).

The shape and size of the main body ( 23 ) of the molded container ( 2 ) are not particularly limited. For example, when the molded container ( 2 ) is cup-shaped, the shrinkage rate should be about 0.45 to 0.8, and the height of the main body ( 23 ) should be about 10 to 50 mm. The shape and size of the bottom (24) are not particularly limited. For example, when the bottom ( 24 ) is circular, the diameter may be about 40 to 100 mm. The shape and size of the opening (21) are not particularly limited. For example, the shape may be circular, elliptical, or polygonal. In terms of size, in the case of a circular opening ( 21 ), the diameter may be about 20 to 140 mm. The shape and size of the flange part (22) are not particularly limited either. For example, the shape may be similar to that of the opening ( 21 ), and in this case, the width may be about 3 to 15 mm. A rounded corner portion (25) with a predetermined radius of curvature may also be formed at the junction of the body portion (23) and the bottom portion (24). The radius of curvature of the fillet ( 25 ) is also not particularly limited, as long as it is about 0.5 to 20 mm. The step difference (26) can also be arbitrarily set on the body portion (23). Also, the bottom (24) can also be provided with a step difference (27) arbitrarily.

The identification mark (15) is any one or a combination of words, graphics, marks and patterns. The identification mark (15) can be single color or multi-color. The size of the identification mark (15) is not particularly limited. As the identification mark (15), specific examples include: the name and description (quality, composition, precautions, etc.) of the content (3), design composition, mark, logo, trademark, product name, unified beautification mark, Identification marks of containers and packaging with legal obligations (such as aluminum recycling marks), environmental protection marks, etc. In addition, the identification mark (15), as shown in Fig. 1(b), only needs to be marked on the body portion (23) at least, but it can also be marked on the outside of the flange portion (22) or the bottom (24).

The shaped container (2), as shown in Figure 2, has a container (20) containing the content (3), and the outer peripheral edge of the cover (4) is heat-sealed to the entire upper surface of the flange (22), thereby Used as package (5). Contents (3) include food, pharmaceuticals, chemicals, electronic parts, batteries, hygiene products, and other industrial products. Examples of foods include cheese or cream, jelly, yokan, pudding, miso, curry, pasta sauce, fruit juice, and sauces. The shape of the content (3) is not limited either, it can be liquid, semi-solid, or solid. An annular heat-seal portion (X) of predetermined width is formed between the lower surface of the cover (4) and the upper surface of the flange portion (22). In the heat-seal portion (X), the cover (4) and the flange portion ( 22) Heat welding. In addition, the unsealing tongue piece (41) is provided on the lid (4) in such a manner as to protrude outward from the flange portion (22), and by grasping the unsealing tongue piece (41) and pulling the lid (4) out of the shaped container The flange portion (22) of (2) is peeled off, and the package (5) can be unsealed.

The shaped container (2) is manufactured by performing pressing processing such as deep drawing processing and stretching processing on a blank punched from the laminated packaging material (1) shown in FIG. 3 . The circle system represented by a dot chain line in Fig. 3 represents the blank (B). However, the shape of the blank (B) is not limited to a circle, and can be appropriately changed according to the shape of the forming container (2) to be formed.

The laminated packaging material (1) has: a barrier layer (13), which protects the contents (3) of the package (5) from being affected by gas, water vapor and light; a sealing layer (11), which is separated by an adhesive layer ( 12) set to cover one side of the barrier layer (13); and a protective layer (16), which has light transmittance, and is set across the adhesive layer (14) to cover the other side of the barrier layer (13); the protective layer (16) ) among the two sides of at least the side facing the barrier layer (13) (in this embodiment, only the side facing the barrier layer (13)) using ink to print characters, graphics, marks and patterns An identification mark (15) constituted by at least any one of . The protective layer (16) covers the outer surface side of the main body (23) and the bottom (24) and the outward flange by performing pressing processing such as deep drawing processing or stretching processing on the laminated packaging material (1). The lower surface side of the part (22), and the sealing layer (11) covers the inner surface side of the body part (23) and the bottom part (24) and the upper surface side of the outward flange part (22), thereby manufacturing Shaped container (2). The identification mark (15) is recognizable from the outside through the protective layer (16).

The barrier layer (13) of the laminated packaging material (1) is a layer used to protect the contents (4) of the packaging body (5) from the influence of gas, water vapor and light, etc. It is made of aluminum foil, copper foil, It is made of metal foil such as iron foil, preferably aluminum foil. As the aluminum foil, a foil made of a soft aluminum material (O material) of the 1000 series, 3000 series or 8000 series specified in JIS H4160:1994 is used for the Tejia series. Specifically, A8021H-O material, A8079H-O material, A1N30H-O material, etc. can be illustrated.

A base layer (illustration omitted) composed of a predetermined chemical treatment liquid is formed on one or both surfaces of the aforementioned aluminum foil.

As said chemical treatment liquid, the water-alcoholic solution containing phosphoric acid, a chromium compound, a fluorine compound, and/or binder resin is mentioned, for example. Chromium compounds include chromic acid and/or chromium (III) salts, fluorine compounds include metal salts of fluorides and/or non-metal salts of fluorides, binder resins include acrylic resins, chitosan At least one resin selected from the group consisting of sugar derivative resins and phenolic resins. The usage amount of the chemical treatment liquid is not particularly limited, as long as the amount of the chromium compound deposited on each side of the aluminum foil is within the range of 0.1 mg/m ² to 50 mg/m ² .

The thickness of the barrier layer ( 13 ) is not particularly limited, but it is usually 50 μm to 200 μm in consideration of the dead-fold properties of the laminated packaging material ( 1 ), container formability, strength of the formed container ( 2 ), and the like.

The adhesive layer (12) between the barrier layer (13) and the sealing layer (11) of the laminated packaging material (1) is composed of an adhesive. In addition, the adhesive agent layer (12) is an arbitrary layer, and it is not essential.

Examples of the adhesive forming the adhesive layer (12) include ethylene chloride-vinyl acetate copolymer-based adhesives, polyester-based adhesives, epoxy-based adhesives, polyolefin-based adhesives, and polyamine-based adhesives. Formate-based adhesives, etc. Among them, a polyurethane resin-based adhesive is preferable, and a two-component hardening type polyurethane resin-based adhesive is particularly preferable because of its excellent effect of suppressing delamination. Polyols can be used as the main ingredient of the two-component curing polyurethane resin adhesive, and polyisocyanates can be used as the curing agent. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, particularly preferably polyester polyols. Examples of the polyisocyanate include aliphatic diisocyanate, aromatic diisocyanate, and alicyclic diisocyanate, and dimers or trimers of each. The thickness of the adhesive layer (12) is not particularly limited, and the rigidity and elongation of the sealing layer (11) and the protective layer (16) can be obtained from delamination between the sealing layer (11) and the barrier layer (13). From the viewpoint of overall balance, it is usually 2 μm to 5 μm.

The sealing layer (11) of the laminated packaging material (1) is made of heat-sealable resin, and it is integrally provided on the entire body portion (23) and bottom portion (24) of the container portion (20) of the molded container (2). inner surface to the upper surface of the flange part (22).

Examples of the heat-sealable resin constituting the sealing layer (11) include polyolefin, polyvinyl alcohol, polystyrene, and polystyrene. Among them, polyolefins are preferred, and examples thereof include homopolypropylene, propylene-ethylene block copolymers, propylene-ethylene random copolymers, and polyethylene. In addition, examples of polyethylene include low-density polyethylene, medium-density polyethylene, and high-density polyethylene. In addition, polyolefins may be acid-modified.

The above-mentioned hot-melt resin may contain a filler, and examples of the filler include white clay, silica, talc, titanium dioxide, and carbon black.

Moreover, the said heat-melt-adhesive resin may contain an elastomer, As an elastomer, a styrene-type elastomer, an olefin-type elastomer, etc. are mentioned.

The sealing layer ( 11 ) may be a single layer made of the same kind of heat-sealable resin, or may be a multilayer in which two or more layers of the same or different kinds of heat-sealable resins are laminated. The number of layers of the multilayer is not particularly limited, and is usually about 1 to 5.

The overall thickness of the sealing layer (11) is not particularly limited. If the heat-sealing property (the sealing property of the packaging body (5)), the cushioning property of the sealing layer (11), and the relationship between the sealing layer (11) and the protective layer (16) are considered, The overall balance of rigidity and elongation, etc., is usually 30 μm to 400 μm.

The adhesive layer (14) between the barrier layer (13) and the protective layer (16) of the laminated packaging material (1) is composed of an adhesive. In addition, the adhesive agent layer (14) is an arbitrary layer, and it is not essential. The adhesive layer (14) can effectively prevent delamination between the barrier layer (13) and the protective layer (16) during the forming process of the laminated packaging material (1). At the same time, the dimensional stability of the identification mark after the forming process also becomes good, especially the dimensional stability of the identification mark (15) of the formed container (2) is optimized.

As the adhesive for forming the adhesive layer ( 14 ), the same one as that for forming the adhesive layer ( 12 ) can be used. In particular, a two-component curing type polyurethane resin adhesive is preferable from the viewpoint of contributing to formability. Polyols can be used as the main ingredient of the two-component curing polyurethane resin adhesive, and polyisocyanates can be used as the curing agent. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, particularly preferably polyester polyols. Examples of the polyisocyanate include aliphatic diisocyanate, aromatic diisocyanate, and alicyclic diisocyanate, and dimers or trimers of each.

The thickness of the adhesive layer (14) is not particularly limited, from the adhesiveness of the identification mark (15) to the barrier layer (13), and the effect of the identification mark (15) on the barrier layer during the forming process of the laminated packaging material (1) The followability of (13) is usually 2 μm to 5 μm from the viewpoint of suppressing delamination between the barrier layer (13) and the protective layer (16).

The protective layer (16) of the laminated packaging material (1) is formed of a synthetic resin film, which is provided from the entire outer surface of the housing portion (20) of the molded container (2) to the entire lower surface of the flange portion (22). The synthetic resin film has an identification mark (15) formed on at least the surface of the barrier layer (13) side, because the identification mark (15) must be able to be recognized from the outside of the forming container (2), so it is light-transmitting membrane.

The aforementioned synthetic resin film may be of an extended type or a non-extended type. Specific examples include polyolefin films, polyester films, and polyamide films, preferably polyolefin films. Polyolefin films can be exemplified: homopolypropylene films, propylene-ethylene block copolymer films, propylene-ethylene random copolymer films, and polyethylene films, and polyethylene films can be further exemplified: low-density polyethylene films, linear low Density polyethylene film, medium density polyethylene film, high density polyethylene film. In addition, the polyolefin film may be an acid-modified type. As a polyester film, a polyethylene terephthalate film, a PTT (polytrimethylene terephthalate film), a polybutylene terephthalate film, etc. are mentioned. Examples of polyamide membranes include nylon membranes. In particular, when the depth of the housing part (20) of the forming container (2) is relatively deep, and is about twice the diameter of the opening, it is preferable to use a propylene-ethylene block copolymer film or a propylene-ethylene random copolymer film .

The aforementioned synthetic resin film may contain an elastomer, and examples of the elastomer include styrene-based elastomers, olefin-based elastomers, and the like. When an elastomer is included, impact resistance can be ensured and the anti-whitening effect can be improved.

Various known waxes and/or surfactants can also be pre-mixed in the aforementioned synthetic resin film as slip agents, and can also be coated on the surface of the synthetic resin film by methods such as spraying. In this case, smoothness can be ensured and container formability can be improved. Examples of waxes include natural waxes and/or synthetic waxes. Examples of synthetic waxes include hydrocarbon-based synthetic waxes, hydrogenated waxes, silicon-based waxes (polysiloxane waxes), fluorine-based waxes, and fatty acid amide-based waxes. Examples of the surfactant include at least one selected from the group consisting of anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. A slip agent can also be used as a means for realizing characteristic configuration 5 described later.

The aforementioned synthetic resin film may contain a coloring material described later as long as the external visibility of the identification mark ( 15 ) can be ensured without excessively impairing its translucency.

The protective layer ( 16 ) may be a single layer composed of the same type of synthetic resin film, or may be a multilayer layer in which two or more layers of the same type or different types of synthetic resin films are laminated. The number of layers of the multilayer is not particularly limited, and is usually about 1 to 5.

The thickness of the protective layer ( 16 ) is not particularly limited, but it is generally 12 μm to 200 μm in consideration of the extensibility of the laminated packaging material ( 1 ) during press processing and the rigidity of the formed container ( 2 ).

The ink for forming the identification mark (15) on the protective layer (16) is a composition in which a coloring material is dispersed in a binder resin, and contains an organic solvent.

The aforementioned binder resins include, for example: those selected from polyurethane resins, acrylic resins, epoxy resins, polyolefin resins, polystyrene resins, polyvinyl chloride resins, polyamide resins, polycarbonate resins, phenol resins, At least one of resins and polyester resins (polyethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.) The hardening mode may be a hardening mode by heat instead of active energy rays. In addition, a room temperature hardening type binder resin can also be used, for example, a cellulose-based resin (cellulose, etc.), an acrylic varnish resin, or a phenol novolac resin can also be used.

Among the aforementioned binder resins, polyurethane resins are preferred, especially two-component hardening polyurethane resins. In this case, setting the Young's modulus (JIS K7162) of the cured film to 70 MPa to 400 MPa improves the effect of suppressing peeling or cracking of the identification mark ( 15 ) from the protective layer ( 16 ) during press processing. The main agent of two-component hardening polyurethane resin is polyol, and the hardening agent is polyisocyanate. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, particularly preferably polyester polyols. Examples of the polyisocyanate include aliphatic diisocyanate, aromatic diisocyanate, and alicyclic diisocyanate, and dimers or trimers of each.

In the binder resin, it is preferable that the Young's modulus (JIS K7162) of the cured film is 70 MPa to 400 MPa, since the identification mark ( 15 ) will not be peeled off or cracked from the protective layer ( 16 ) during press processing. From this point of view, the tensile strength at break (JIS K7161) of the cured film is more preferably 25 MPa to 60 MPa and the tensile elongation at break is 50% to 400%.

Examples of the aforementioned coloring material include pigments and/or dyes. Examples of pigments include: titanium oxide, zinc oxide, luster white, perlite, barium carbonate, calcium carbonate, precipitated silica, aerosil, talc, alumina white, mica , Synthetic calcium silicate, magnesium carbonate, barium carbonate, carbon black, magnetite and iron oxide (bengala) and other organic or inorganic pigments. Moreover, as a dye, an anthraquinone dye, an azo dye, a quinoline dye, etc. can be illustrated. The content of the coloring material in the printing ink is not particularly limited, but generally 10-60% by mass is sufficient, preferably 15-50% by mass, in consideration of appearance such as the clarity of the identification mark (15).

Examples of the organic solvent include toluene, xylene, acetone, methyl ethyl ketone, methanol, ethanol, isopropanol, ethyl acetate, and propyl acetate.

Gravure printing is mentioned as a means of applying ink to at least the inner surface of the synthetic resin film to form the identification mark (15). In addition, ink may be additionally printed on the outer surface of the synthetic resin film.

Furthermore, the synthetic resin film as the protective layer (16) exhibits the following behaviors in the printing machine for printing the identification mark (15) and the press machine for forming the shaped container (2), respectively.

First, in the printing machine, after the identification mark (15) is printed on the synthetic resin film, tension is applied to the synthetic resin film in its direction of travel (MD) when it is wound up with a roll, so it is assumed that the synthetic resin film Too soft and it will overstretch on the printing press. As a result, the identification mark (15) cannot follow the elongation of the synthetic resin film, and the adhesive force of both decreases accordingly.

Also, if the blank made of the laminated packaging material (1) is subjected to, for example, deep-drawing processing by a pressing machine, in the area to be formed of the laminated packaging material (1), the convex area corresponding to the shape of the container (2) is formed. The part of the edge part (22) is compressed, and the part corresponding to the body part (23) and the fillet part (25) is extended instead. At this time, although the identification mark (15) is also related to its position, it will shrink or extend along the deformation direction of the laminated packaging material (1). As a result, the identification mark (15) is cracked or its shape is distorted.

In view of the above, the synthetic resin film as the protective layer (16) has the following characteristic configuration 1. Then, it is considered that due to the feature configuration 1, the molded container (2) has both container formability and dimensional stability of the identification mark (15).

Characteristic composition 1: The tensile strength (δ1 (MD)) of the synthetic resin film at the maximum stress in the direction of travel ( _{MD )} and the tensile strength (δ1 ₍ TD)) of the maximum stress in the width direction _{( TD )} ) are respectively limited to 500MPa～2500MPa, preferably 500MPa～1000MPa, and the ratio of the tensile strength (δ1 _{( MD )} /δ1 _{( TD )} ) of the two is limited to 0.9～1.1, preferably 0.95～1.05.

In order to achieve both container formability and identification mark dimensional stability more ideally, the synthetic resin film as the protective layer (16) further has the following characteristic configuration 2 and/or characteristic configuration 3.

Characteristic composition 2: The tensile strength at break point (δ2 ₍ MD ₎₎ of the synthetic resin film in the direction of travel ( _MD ) and the tensile strength at break point (δ2(TD)) in the width direction _{( TD )} are respectively limited to 30MPa-70MPa, preferably 30MPa-50MPa, and the ratio (δ2 _{( MD )} )/(δ2 _{( TD )} ) is limited to 0.9-1.1, preferably 0.95-1.05.

Characteristic composition 3: The tensile elongation at break point (E ₍ MD)) of the synthetic resin film in the direction of travel ( _{MD )} and the tensile elongation at break point (E ₍ TD)) in the width direction ( _{TD )} are respectively It is limited to 500% to 900%, preferably 500% to 800%, and the ratio (E _{( MD )} )/(E _{( TD )} ) is limited to 0.8 to 1.2, preferably 0.9 to 1.1.

From the standpoint of both container formability and identification mark dimensional stability, the synthetic resin film of the Tejia series used as the protective layer ( 16 ) fully has the characteristic constitution 1, the characteristic constitution 2 and the characteristic constitution 3.

Also, when the identification mark (15) formed on the synthetic resin film as the protective layer (16) is made of heat-curable ink, a relatively high-temperature drying step is performed on the printed synthetic resin film. At this time, although it is also related to the type of synthetic resin used as the raw material, the synthetic resin film generally expands in the traveling direction (MD) of the rotary machine and shrinks in the width direction (TD). The synthetic resin film and the identification mark (15) The adhesion force may also be reduced accordingly.

In view of the above, the synthetic resin film used as the protective layer (16) can further have the following characteristic configuration 4, so that it is easier to achieve both container formability and identification mark dimensional stability.

Characteristic composition 4: The heating dimensional change rate (CTE _{( MD )} ) of the synthetic resin film in the direction of travel (MD) is limited to -2.0% to 1.5% under the measurement conditions of 90°C and 30 minutes, and will be measured at 90°C And under the measurement conditions of 30 minutes, the thermal dimensional change rate (CTE _{( TD )} ) of the synthetic resin film in the width direction (TD) is limited to -2.0% to 1.5%, and the difference (CTE _{( MD )} -CTE _{( TD )} ) is limited to less than 1.5%, that is, 0-1.5%, preferably 0-1.0%.

Also, as mentioned above, if press processing, especially deep drawing processing, is performed on the blank composed of the laminated packaging material (1), the synthetic resin film that becomes the protective layer (16) will correspond to the deformation of the molded container (2). direction to be compressed or stretched. Taking this point into consideration, the synthetic resin film used as the protective layer (16) preferably has the following characteristic composition 5, which can more ideally achieve both the container formability and the dimensional stability of the identification mark, and the printability of the identification mark is also the best. optimization. The coefficient of dynamic friction can also be adjusted by using the aforementioned lubricant in combination.

Characteristic configuration 5: The dynamic friction coefficient of the outer surface of the synthetic resin film is limited to 0.1 to 0.5, preferably 0.1 to 0.3.

The laminated packaging material (1) can be produced by various known methods, such as dry lamination, melt extrusion lamination, thermal lamination and other known methods, and these methods can also be combined.

Although not shown, in one aspect, the cover ( 4 ) is composed of a cover-side protective layer, an adhesive layer, a cover-side barrier layer, an adhesive layer, and a cover-side sealing layer in order from the upper side. Wherein the adhesive agent layer can omit one or both of them.

The protective layer on the cover side is a layer located on the cover (4) to protect the package (5) and its contents (3) from external impact, etc., and is made of various known synthetic resins. As the synthetic resin, one that can be used as a protective layer among biomass-derived synthetic resins and petrochemical-derived synthetic resins can be suitably used, preferably polyester and/or polyolefin. The polyester is preferably polyethylene terephthalate, and the polyolefin is preferably polyethylene, polypropylene, propylene-ethylene copolymer (block, random), or homopolypropylene. In addition, coating agents such as nitrocellulose, shellac resin, epoxy resin, urethane resin, chlorinated polyolefin resin, acrylic resin, and chlorinated ethylene-vinyl acetate copolymer can also be used to form the protective layer. The protective layer may be a single layer or a multilayer composed of at least two independent layers. The overall thickness of the protective layer is not particularly limited, but is usually 5 μm to 30 μm.

The adhesive layer on the upper side is any layer between the protective layer and the barrier layer, and may be formed with the same adhesive as the adhesive forming the two adhesive layers ( 12 ) ( 14 ) of the laminated packaging material ( 1 ). The thickness of the upper adhesive layer is not particularly limited, but is usually 1 μm to 5 μm.

The lid-side barrier layer has the function of protecting the contents (3) of the package (5) from light, gas, water vapor, etc. together with the shaped container (2). The barrier layer is made of metal foil, for example, and iron foil, stainless steel foil, and aluminum foil are used. In addition, a base layer composed of the aforementioned chemical treatment liquid may be formed on one or both surfaces of the metal foil. The thickness of the barrier layer is not particularly limited, but is usually 5 μm to 40 μm.

The lower adhesive layer is any layer between the cover-side barrier layer and the cover-side sealant layer, and may be composed of the same adhesive as that used to form the upper adhesive layer. The thickness of the lower adhesive layer is not particularly limited, but is usually 1 μm to 5 μm.

The lid-side sealant layer is a layer thermally welded to the sealant layer (11) present on the upper surface of the flange portion (22) of the molded container (2), and is made of various known heat-sealable resins. As the heat-sealable resin, the same heat-sealable resin as the sealant layer (11) of the molded container (2) can be used, and polyolefin is particularly preferably used. The lid-side sealant layer may be a single layer made of the same type of heat-sealable resin, or may be a multilayer layer in which two or more layers of the same or different types of heat-sealable resin are laminated. The number of layers of the multilayer is not particularly limited, and is usually about 1 to 5. The overall thickness of the sealing layer is not particularly limited, but is usually 10 μm to 50 μm.

Other aspects of the cover (4) are composed of a cover-side protective layer, a cover-side barrier layer formed of a metal vapor-deposited film, an adhesive layer, a cover-side barrier layer formed of a metal vapor-deposited film, and a cover-side sealing layer in order from the upper side . The metal vapor-deposited film can be directly formed on the lower surface of the cover-side protection layer, or directly formed on the upper surface of the sealing layer. Aluminum etc. are mentioned as a metal.

The cover (4) is formed by punching sheet-shaped materials produced by various known methods such as dry lamination, melt extrusion lamination, thermal lamination, and gravure coating. The shape/size of the lid (4) is not particularly limited, and can be set according to the shape and size of the opening (21) and the flange portion (22) of the molded container (2) and according to the purpose. Also can be provided with unsealing tongue piece (41) (Fig. 3) on the periphery of cover (4). [Example]

Examples and comparative examples of the present invention will be described in detail below. However, the present invention is not limited to the Examples.

In addition, in the description related to the following examples and comparative examples, the meanings of the abbreviations indicating the synthetic resin film serving as the protective layer of the laminated packaging material are as follows. C-rPP: non-stretched film formed by extruding a monolayer of propylene-ethylene random copolymer C-hPP: non-stretched film formed from extruded monolayer of homopolypropylene LLDPE: A film formed by extruding a single layer of linear low-density polyethylene film HDPE: A film formed by extruding a single layer of high-density polyethylene film C-(rPP/bPP/rPP): non-stretched co-extruded three-layer polypropylene film formed by propylene-ethylene random copolymer layer, propylene-ethylene block copolymer layer and propylene-ethylene random copolymer layer O-Ny: Extended Nylon Membrane C-PET: Non-extended crystalline polyethylene terephthalate film O-PBT: Extended Polybutylene Terephthalate Film O-PET: Extended polyethylene terephthalate film O-rPP: non-stretched film formed by extruding a monolayer of propylene-ethylene random copolymer

Furthermore, in the following examples, as the ink used when the identification mark is printed on the synthetic resin film as the protective layer of the laminated packaging material, carbon black (CB) as the pigment is dispersed in the The organic solvent made of acrylic resin as the binder is heat-curable black ink. The meanings of the abbreviations representing the black ink are as follows. A (30): 30% by mass of carbon black content B(5): The content of carbon black is 5% by mass C(20): 20% by mass of carbon black content D(65): The carbon black content is 65% by mass E(35): The content of carbon black is 35% by mass F(15): The content of carbon black is 15% by mass G (40): 40% by mass of carbon black content [Example 1] Production of laminated packaging materials

C-rPP (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film F for forming a protective layer. The C-rPP was corona-treated on both sides. It is the following synthetic resin film: the tensile strength δ1 ₍ MD) of the aforementioned C-rPP in the direction of travel ( _MD ): 580MPa, the tensile strength δ1 ₍ TD ₎ in the width direction ( _{TD )} : 530MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.09, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 45MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 33MPa, ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.36, tensile elongation at break point E _{( MD )} in the direction of travel ( MD ): 770%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 830%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.93, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -1.9% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -1.7%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.2%, and the dynamic friction coefficient of the surface: 0.10.

Next, as shown in FIG. 4 , 10 circles S (radius 85 mm) were drawn on one side of C-rPP with a compass. Each circle S is a planned line for producing a blank for molding described later, and is drawn as a dotted line for convenience. In addition, the circles S were arranged so that their respective centers were located on the center line of the width extending in the longitudinal direction of C-rPP, and the distance between the centers was at equal intervals of 90 mm.

Next, for all 10 circles S, print the identification mark (15) of slightly isosceles trapezoidal shape (upper bottom 9mm, lower bottom 3mm, height 8mm) formed by printing ink A (30) on the radius of each circle S one by one on one point. The center of gravity of the identification mark (15) is located at a position 30 mm away from the center of the circle S. Also, the upper and lower bases of the identification mark (15) are parallel to one side of the C-rPP.

Here, the reason for making the identification mark (15) a substantially isosceles trapezoid is as follows. That is, first, a blank formed by punching a laminated packaging material provided with a synthetic resin film as a protective layer is formed by using a deep-drawing forming device described later to manufacture a shaped container. At this time, the ring-shaped portion that becomes the flange portion It is fixed, and the part surrounded by this annular part extends. At this time, the tensile force in the radial direction of the circle S and the compressive force in the circumferential direction of the circle S are applied to the blank, so the tensile force in the radial direction of the circle S and the compressive force in the circumferential direction of the circle S are also applied to the identification mark (15). However, the aforementioned tensile force and aforementioned compressive force become smaller from the peripheral portion of the circle S toward the center, so the amount of compression in the circumferential direction and the stretching amount in the radial direction of the identification mark (15) are reduced from the peripheral edge of the circle S Parts of the lower part taper toward the center. As a result, the shape of the aforementioned identification mark (15) is corrected from a slightly isosceles trapezoid to a slightly square.

The synthetic resin film F for protective layers was produced in accordance with the above procedures.

Next, a base layer was formed on both surfaces of an aluminum foil (JIS H4160: A8079-O material) having a thickness of 120 μm using a chemical treatment solution. The chemical treatment solution is a solution composed of phosphoric acid, polyacrylic acid, chromium (III) chloride, water and alcohol. In addition, the amount of coating is such that the amount of chromium deposited on each surface of the aluminum alloy foil is 10 mg/m ² .

Next, on both sides of the above-mentioned processed aluminum foil, apply a two-component curing polyurethane adhesive with polyester polyol as the main ingredient and polyisocyanate as the curing agent so that the thickness after curing becomes 3 μm. agent to form an adhesive layer.

Next, the surface of the aforementioned C-rPP printed with the identification mark (15) was pasted on the surface of an adhesive layer of the aforementioned aluminum foil, and a single-layer non-stretched homopolypropylene with a thickness of 300 μm was used as a heat-sealable resin film. The film was bonded to the surface of the other adhesive layer, and then subjected to heat aging treatment in an environment of 40° C. for 8 days, thereby producing a laminated packaging material. Manufacture of shaped containers

Next, the laminated packaging material was set in a deep-drawing forming device (manufactured by AMADA Co., Ltd.) having a male die and a female die of predetermined dimensions. In addition, in this molding apparatus, the target value of the body portion height (accommodation portion depth) of the obtained molded container was 30 mm. Next, using the above-mentioned forming device, a circular blank with a radius of 85 mm was punched out from the laminated packaging material, and at the same time, deep-drawing was performed on the laminated packaging material so that the protective layer became the outer surface side of the housing part, thereby manufacturing the product shown in FIG. 1 A shaped container of the shape shown.

The molded container was formed in such a manner that the opening of the housing portion was circular (diameter 50.5 mm), and an annular flange portion (width 4.5 mm) similar in shape to the opening protruded horizontally outward from the periphery of the opening. Also, the main body is in an inverted cone shape (angle 6°, height 30.0 mm), and the bottom is circular (diameter 44.2 mm). In addition, a rounded corner with a radius of curvature of 10 mm is formed at the boundary between the main body and the bottom.

Furthermore, on the side of the main body of the shaped container, a roughly square identification mark (15) composed of printing ink A (30) is formed in a manner parallel to the flange of the shaped container (target value: vertical length 10mm, horizontal length 10mm) and can be identified (refer to Figure 3).

A total of 10 shaped containers were produced in the above-mentioned manner. [Example 2]

C-hPP (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD ₎ of this C-hPP in the direction of travel ( _MD ): 770MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 760MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.01, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 45MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 34MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.32, tensile elongation at break point E ₍ MD ₎ in the direction of travel ( _MD ): 640%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 700%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.91, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -0.7% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.7%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, and the dynamic friction coefficient of the surface: 0.20. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 3]

C-hPP (width 71 mm, length 550 mm, thickness 40 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD ₎ of this C-hPP in the direction of travel ( _MD ): 980 MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 960 MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.02, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 46MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 47MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.98, tensile elongation at break point E ₍ MD ₎ in the direction of travel ( _MD ): 690%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 670%, ratio E _{( MD )} /E _{( TD )} : 1.03, heating dimensional change rate CTE _{( MD )} in the direction of travel ( MD ): -0.6% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.6%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, and the dynamic friction coefficient of the surface: 0.30. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 4]

C-rPP (width 71 mm, length 550 mm, thickness 40 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD) of this C-rPP in the direction of travel ( _{MD )} : 540 MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 505 MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.07, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 63MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 55MPa, ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.15, tensile elongation at break point E _{( MD )} in the direction of travel ( MD ): 520%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 680%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.76, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -0.9% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -1.2%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.30%, and the dynamic friction coefficient of the surface: 0.20. Also, B (5) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 5]

LLDPE (width 71 mm, length 550 mm, thickness 40 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD) of the LLDPE in the direction of travel ( _{MD )} : 500MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 550MPa, the ratio of the two δ1 _{( MD )} /δ1 _{( TD )} : 0.91, Tensile strength at break in direction of travel (MD) δ2 _{( MD )} : 35MPa, Tensile strength at break in width direction (TD) δ2 _{( TD )} : 31MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.13, the breaking point in the direction of travel (MD) tensile elongation E _{( MD )} : 680%, the breaking point in the width direction (TD) Tensile elongation E _{( TD )} : 620%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.10, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 0.8%, in the width Heating dimensional change rate CTE _{( TD} ) in direction (TD ₎ : 0.9%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.1%, kinetic friction coefficient of surface: 0.40. Also, C (20) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 6]

HDPE (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD ₎ of the HDPE in the direction of travel ( _MD ): 820MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 870MPa, the ratio of the two δ1 _{( MD )} / δ1 _{( TD )} : 0.94, Tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 41MPa, Tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 35MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.17, the tensile elongation E _{( MD )} : 570%, the breaking point in the width direction (TD) Tensile elongation E _{( TD )} : 520%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.10, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 0.5%, in the width Heating dimensional change rate CTE _{( TD) in direction (TD )} : 0.6%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.1%, dynamic coefficient of friction on the surface: 0.30. Also, C (20) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 7]

C-rPP (width 71 mm, length 550 mm, thickness 60 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD ₎ of this C-rPP in the direction of travel ( _MD ): 790MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 720MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.10, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 49MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 38MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.29, tensile elongation at break point E _{( MD )} in the direction of travel ( MD ): 620%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 680%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.91, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -0.6% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.6%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, and the dynamic friction coefficient of the surface: 0.20. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 8]

C-rPP (width 71 mm, length 550 mm, thickness 80 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD ₎ of this C-rPP in the direction of travel ( _MD ): 790MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 720MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.10, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 49MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 48MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.02, tensile elongation at break point E ₍ MD ₎ in the direction of travel ( _MD ): 680%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 680%, ratio E _{( MD )} /E _{( TD )} : 1.0, heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -0.4% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.4%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, and the dynamic friction coefficient of the surface: 0.20. Use A (30) as ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 9]

C-hPP (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD ₎ of this C-hPP in the direction of travel ( _MD ): 770MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 760MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.01, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 45MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 45MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.0, tensile elongation at break point E _{( MD )} in the traveling direction ( MD ): 680%, in the width direction ( TD ) Tensile elongation at breaking point E _{( TD )} : 700%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.97, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): -0.7% , The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.7%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, and the dynamic friction coefficient of the surface: 0.20. Also, D (65) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 10]

C-(rPP/bPP/rPP) (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 (MD) of the C-(rPP/bPP/rPP) in the _direction of _travel ( _MD ): 650MPa, the tensile strength δ1 ₍ TD) in the width direction (TD _{) )} : 680MPa, the ratio of the two δ1 _{( MD )} / δ1 _{( TD )} : 0.96, the breaking point in the direction of travel (MD) Tensile strength δ2 _{( MD )} : 50MPa, the breaking point in the width direction (TD) Tensile strength δ2 _{( TD )} : 25MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 2.0, tensile elongation E ₍ MD) at the breaking point in the direction of travel ( _{MD )} : 460%, in the width Tensile elongation at breaking point E ₍ TD ) in the direction ( _{TD )} : 510%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.90, the heating dimensional change rate CTE in the direction of travel (MD) _{( MD )} : -0.4%, heating dimensional change rate in the width direction (TD) CTE _{( TD )} : 0.7%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 1.10%, dynamic friction coefficient of the surface: 0.20. Also, E(35) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 11]

C-(rPP/bPP/rPP) (width 71 mm, length 550 mm, thickness 45 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 (MD) of the C-(rPP/bPP/rPP) in the direction of travel ( _{MD )} : 720MPa, the tensile strength δ1 ₍ TD) in the width direction ₍ TD _{) )} : 760MPa, the ratio of the two δ1 _{( MD )} / δ1 _{( TD )} : 0.95, the breaking point in the direction of travel (MD) Tensile strength δ2 _{( MD )} : 48MPa, the breaking point in the width direction (TD) Tensile strength δ2 _{( TD )} : 47MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.02, tensile elongation E ₍ MD) at the breaking point in the direction of travel ( _{MD )} : 720%, at the width Tensile elongation at break point E ₍ TD ) in the direction ( _{TD )} : 760%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.95, the heating dimensional change rate CTE in the direction of travel (MD) _{( MD )} : -0.6%, heating dimensional change rate in the width direction (TD) CTE _{( TD )} : -0.5%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.10%, kinetic friction coefficient of the surface: 0.20 . Also, F (15) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 12]

O-Ny (width 71 mm, length 550 mm, thickness 25 μm) was prepared as a synthetic resin film for forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD) of this O-Ny in the direction of travel ( _MD ): 2500MPa, the tensile strength δ1 ₍ TD ₎ in the width direction ( _{TD )} : 2300MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.09, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 240MPa, the tensile strength at break point in the direction of travel (TD) δ2 _{( TD )} : 270MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.89, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 100%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 100%, ratio E _{( MD )} /E _{( TD )} : 1.00, heating dimensional change rate CTE _{( MD )} in the direction of travel ( MD ): 1.7%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : 0.6%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 1.10%, and the dynamic friction coefficient of the surface: 0.25. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 13]

C-PET (width 71 mm, length 550 mm, thickness 35 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD ₎ of this C-PET in the direction of travel ( _MD ): 2100MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 2120MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 0.99, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 260MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 265MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.98, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 150%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 130%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.15, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 1.2%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : 0.2%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 1.00%, and the dynamic friction coefficient of the surface: 0.50. Also, G (40) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Example 14]

O-PBT (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD) of this O-PBT in the direction of travel ( _{MD )} : 1540MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 1530MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.01, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 80MPa, the tensile strength at break point in the direction of travel (TD) δ2 _{( TD )} : 78MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.03, tensile elongation at break point E ₍ MD ₎ in the direction of travel ( _MD ): 390%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 400%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.98, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 0.2%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : -0.1%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.30%, and the dynamic friction coefficient of the surface: 0.30. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative example 1]

LLDPE (width 71 mm, length 550 mm, thickness 50 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD ₎ of the LLDPE in the direction of travel ( _MD ): 240MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 300MPa, the ratio of the two δ1 _{( MD )} /δ1 _{( TD )} : 0.80, tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 33MPa, tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 27MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.22, the tensile elongation E _{( MD )} at the breaking point in the direction of travel (MD): 660%, the breaking point in the width direction (TD) Tensile elongation E _{( TD )} : 800%, the ratio of the two E _{( MD )} /E _{( TD )} : 0.83, heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 0.6%, in width Heating dimensional change rate CTE _{( TD) in direction (TD )} : 0.8%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.2%, dynamic coefficient of friction on the surface: 0.40. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative example 2]

O-Ny (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD ₎ of this O-Ny in the direction of travel ( _MD ): 2600MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 2100MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.24, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 250MPa, the tensile strength at break point in the width direction (TD) δ2 _{( TD )} : 290MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.86, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 120%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 100%, ratio E _{( MD )} /E _{( TD )} : 1.20, heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 2.2%, The heating dimensional change rate CTE _{( TD} ) in the width direction (TD ₎ : 2.5%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.30%, and the dynamic friction coefficient of the surface: 0.10. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative example 3]

O-PET (width 71 mm, length 550 mm, thickness 20 μm) was prepared as a synthetic resin film forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD ₎ of the O-PET in the direction of travel ( _MD ): 3750MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 3880MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 0.97, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 220MPa, the tensile strength at break point in the direction of travel (TD) δ2 _{( TD )} : 230MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.96, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 90%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 85%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.06, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 1.2%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : 1.3%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 0.10%, and the dynamic friction coefficient of the surface: 0.60. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative example 4]

HDPE (width 71 mm, length 550 mm, thickness 50 μm) was prepared as a synthetic resin film forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD) of the HDPE in the direction of travel ( _{MD )} : 1050MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 1400MPa, the ratio of the two δ1 _{( MD )} /δ1 _{( TD )} : 0.75, Tensile strength at break point in direction of travel (MD) δ2 _{( MD )} : 40MPa, Tensile strength at break point in width direction (TD) δ2 _{( TD )} : 33MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 1.21, the tensile elongation E _{( MD )} at the breaking point in the direction of travel (MD): 580%, the breaking point in the width direction (TD) Tensile elongation E _{( TD )} : 350%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.66, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 0.5%, in the width Heating dimensional change rate CTE ₍ TD) in direction ( _{TD )} : 0.5%, absolute value of CTE _{( MD )} -CTE _{( TD )} : 0%, dynamic friction coefficient of surface: 0.25. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative Example 5]

O-rPP (width 71 mm, length 550 mm, thickness 30 μm) was prepared as a synthetic resin film forming a protective layer. It is a synthetic resin film as follows: the tensile strength δ1 ₍ MD) of this O-rPP in the direction of travel ( _{MD )} : 2000MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 4000MPa, both Ratio δ1 _{( MD )} /δ1 _{( TD )} : 0.50, Tensile strength at break in direction of travel (MD) δ2 _{( MD )} : 150MPa, Tensile strength at break in width direction (TD) δ2 _{( TD )} : 350MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.43, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 200%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 50%, the ratio of the two E _{( MD )} /E _{( TD )} : 4.00, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 3.0%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : 1.0%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 2.0%, and the kinetic friction coefficient of the surface: 0.40. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1. [Comparative Example 6]

O-PBT (width 71 mm, length 550 mm, thickness 20 μm) was prepared as a synthetic resin film for forming a protective layer. It is the following synthetic resin film: the tensile strength δ1 ₍ MD) of this O-PBT in the direction of travel ( _{MD )} : 3000MPa, the tensile strength δ1 ₍ TD) in the width direction ( _{TD )} : 2900MPa, both The ratio of δ1 _{( MD )} /δ1 _{( TD )} : 1.03, the tensile strength at break point in the direction of travel (MD) δ2 _{( MD )} : 210MPa, the tensile strength at break point in the direction of travel (TD) δ2 _{( TD )} : 220MPa, the ratio of the two δ2 _{( MD )} / δ2 _{( TD )} : 0.95, tensile elongation at break point E ₍ MD ) in the direction of travel ( _{MD )} : 150%, in the direction of width ( TD ) Tensile elongation at breaking point E _{( TD )} : 150%, the ratio of the two E _{( MD )} /E _{( TD )} : 1.00, the heating dimensional change rate CTE _{( MD )} in the direction of travel (MD): 2.1%, The heating dimensional change rate CTE ₍ TD) in the width direction ( _{TD )} : 0.2%, the absolute value of CTE _{( MD )} -CTE _{( TD )} : 1.90%, and the dynamic friction coefficient of the surface: 0.30. Also, A (30) was used as the ink.

In addition, a total of 10 molded containers were produced under the same conditions as in Example 1.

and the tensile elongation at breaking point are actual measured values based on JIS K7161. In addition, the heating dimensional change rate is an actual measurement value under heating conditions of a temperature of 90° C. and 30 minutes in accordance with JIS K7133, with the original dimension being 120 mm in the traveling direction (MD) and 120 mm in the width direction (TD). The dynamic friction coefficient is an actual measurement value based on JIS K7125.

The physical properties of the synthetic resin films used in the above-mentioned Examples 1 to 14 and the types of inks used in the printing of the identification mark are shown in Table 1. The physical properties and identification of the synthetic resin films used in the above-mentioned Comparative Examples 1 to 6 are listed in Table 1. Table 2 lists the types of inks used for printing the logo.

[Table 1] Table 1 Synthetic resin film used as protective layer Ink type Thickness (μm) Tensile strength (MPa) Tensile Strength at Breaking Point Tensile elongation at breaking point Heating Dimensional Change Rate dynamic friction coefficient δ1 _(MD) (Mpa) δ1 _(TD) (Mpa) Ratio (δ1 _(MD) )/ (δ1 _(TD) ) δ2 _(MD) (Mpa) δ2 _(TD) (Mpa) Ratio (δ2 _(MD) )/ (δ2 _(TD) ) E _(MD) (%) E _(TD) (%) Ratio (E _(MD) )/(E _(TD) ) CTE _(MD) (%) CTE _(TD) (%) Absolute value of difference |(CTE _(MD) )- (CTE _(TD) | Example 1 C-rPP 30 580 530 1.09 45 33 1.36 770 830 0.93 -1.9 -1.7 0.2 0.10 A(30) 2 C-hPP 30 770 760 1.01 45 34 1.32 640 700 0.91 -0.7 -0.7 0 0.20 A(30) 3 C-hPP 40 980 960 1.02 46 47 0.98 690 670 1.03 -0.6 -0.6 0 0.30 A(30) 4 C-rPP 40 540 505 1.07 63 55 1.15 520 680 0.76 -0.9 -1.2 0.3 0.20 B(5) 5 LLDPE 40 500 550 0.91 35 31 1.13 680 620 1.10 0.8 0.9 0.1 0.40 C(20) 6 HDPE 30 820 870 0.94 41 35 1.17 570 520 1.10 0.5 0.6 0.1 0.30 C(20) 7 C-rPP 60 790 720 1.10 49 38 1.29 620 680 0.91 -0.6 -0.6 0 0.20 A(30) 8 C-rPP 80 790 720 1.10 49 48 1.02 680 680 1.00 -0.4 -0.4 0 0.20 A(30) 9 C-hPP 30 770 760 1.01 45 45 1.00 680 700 0.97 -0.7 -0.7 0 0.20 D(65) 10 C-(rPP/bPP/rPP) 30 650 680 0.96 50 25 2.00 460 510 0.90 -0.4 0.7 1.1 0.20 E(35) 11 C-(rPP/bPP/rPP) 45 720 760 0.95 48 47 1.02 720 760 0.95 -0.6 -0.5 0.1 0.20 F(15) 12 O-ny 25 2500 2300 1.09 240 270 0.89 100 100 1.00 1.7 0.6 1.1 0.25 A(30) 13 C-PET 35 2100 2120 0.99 260 265 0.98 150 130 1.15 1.2 0.2 1.0 0.50 G(40) 14 O-PBT 30 1540 1530 1.01 80 78 1.03 390 400 0.98 0.2 -0.1 0.3 0.30 A(30)

[Table 2] Table 2 Synthetic resin film used as protective layer Ink type Thickness (μm) Tensile strength (MPa) Tensile Strength at Breaking Point Tensile elongation at breaking point Heating Dimensional Change Rate dynamic friction coefficient δ1 _(MD) (Mpa) δ1 _(TD) (Mpa) Ratio (δ1 _(MD) )/ (δ1 _(TD) ) δ2 _(MD) (Mpa) δ2 _(TD) Ratio (δ2 _(MD) )/ (δ2 _(TD) ) E _(MD) (%) E _(TD) (%) Ratio (E _(MD) )/(E _(TD) ) CTE _(MD) (%) CTE _(TD) (%) Absolute value of difference |(CTE _(MD) )- (CTE _(TD) | (Mpa) comparative example 1 LLDPE 50 240 300 0.80 33 27 1.22 660 800 0.83 0.6 0.8 0.2 0.40 A(30) 2 O-Ny 30 2600 2100 1.24 250 290 0.86 120 100 1.20 2.2 2.5 0.3 0.10 A(30) 3 O-PET 20 3750 3880 0.97 220 230 0.96 90 85 1.06 1.2 1.3 0.1 0.60 A(30) 4 HDPE 50 1050 1400 0.75 40 33 1.21 580 350 1.66 0.5 0.5 0 0.25 A(30) 5 O-rPP 30 2000 4000 0.50 150 350 0.43 200 50 4.00 3.0 1.0 2.0 0.40 A(30) 6 O-PBT 20 3000 2900 1.03 210 220 0.95 150 150 1.00 2.1 0.2 1.9 0.30 A(30) [Evaluation of molded containers] (Dimensional stability of identification mark)

For the identification marks (15) marked on the main bodies of the 10 molded containers in Examples 1 to 14 and Comparative Examples 1 to 6, obtain: (i) the respective arithmetic mean values of the longitudinal dimension and the transverse dimension, (ii) the difference between the longitudinal and transverse dimensions (maximum - minimum), (iii) the respective standard deviations of the longitudinal and transverse dimensions; according to (ii) the difference between the longitudinal and transverse dimensions (maximum - minimum value) and (iii) standard deviation to evaluate the dimensional stability of the identification mark. These results are shown in Table 3. In the evaluation results in Table 3, the standard deviation is less than 0.010 as ⊚, 0.010 to less than 0.030 as ◯, and 0.030 or more as x. For the product, ◎ and ○ are acceptable. (Printability of identification mark)

The appearance of the identification marks (marks in a substantially square shape) marked on the main body of each molded container was observed and the printability was evaluated. As a result, in the molded containers of Example 4 and Example 9, a little mottle and a little smudge were observed on the slightly square mark as the identification mark corresponding to the amount of carbon black contained in the ink, but in terms of the product within the unaffected range. Abnormalities were not observed at all in the molded containers of other Examples and Comparative Examples. (container formability)

The heights of the main bodies of 10 molded containers in Examples 1 to 14 and Comparative Examples 1 to 6 were measured to obtain an average of the main body heights, and the formability of the containers was evaluated based on the average of the main body heights. These results are shown in Table 3. In the evaluation results in Table 3, those whose average value of the main body height is 30 mm or more of the target value and no delamination of the flange part are indicated as ◎, and those whose average value of the main body height is less than 30 mm of the target value and are 26 mm or more and The case where delamination did not occur at the flange portion was indicated as ◯, and the case where the average height of the body portion was less than 26 mm and delamination occurred at the flange portion was indicated as ×. For products, ◎ and ○ are acceptable.

Table 3 shows the evaluation results of the dimensional stability of the identification marks and the moldability of the containers of the molded containers of Examples 1 to 14 and Comparative Examples 1 to 6.

[table 3] table 3 Identification Mark Dimensional Stability Container formability (i) Average (ii) Maximum value - minimum value (iii) Standard deviation judgement result Depth of the housing part of the formed container (mm) judgement result Longitudinal length (mm) Horizontal length (mm) Longitudinal length (mm) Horizontal length (mm) longitudinal length Horizontal length Example 1 10.03 10.03 0.05 0.06 0.016 0.019 ○ 35 ◎ 2 10.01 10.01 0.03 0.03 0.010 0.011 ○ 33 ◎ 3 10.00 10.00 0.01 0.01 0.005 0.005 ◎ 33 ◎ 4 10.03 10.03 0.04 0.04 0.014 0.013 ○ 35 ◎ 5 9.99 9.99 0.04 0.04 0.016 0.013 ○ 33 ◎ 6 10.00 10.00 0.03 0.03 0.011 0.010 ○ 31 ◎ 7 10.00 10.01 0.03 0.03 0.008 0.010 ○ 35 ◎ 8 10.00 10.01 0.03 0.03 0.008 0.009 ◎ 35 ◎ 9 10.01 10.01 0.03 0.02 0.009 0.007 ◎ 33 ◎ 10 10.02 10.02 0.05 0.05 0.018 0.017 ○ 33 ◎ 11 10.01 10.01 0.02 0.02 0.008 0.007 ◎ 33 ◎ 12 10.01 10.01 0.02 0.02 0.007 0.008 ◎ 27 ○ 13 10.00 10.00 0.02 0.02 0.005 0.005 ◎ 29 ○ 14 10.01 10.00 0.02 0.02 0.007 0.007 ◎ 29 ○ comparative example 1 10.04 10.04 0.33 0.27 0.110 0.098 x 33 ◎ 2 10.00 10.00 0.02 0.03 0.009 0.011 ○ twenty three x 3 10.00 10.00 0.02 0.02 0.006 0.005 ◎ 19 x 4 10.04 10.03 0.30 0.17 0.105 0.061 x 29 ○ 5 10.00 10.00 0.10 0.05 0.027 0.015 ○ twenty three x 6 10.00 10.00 0.01 0.01 0.005 0.005 ◎ 25 x

The dimensional stability of the identification marks of the molded containers of Examples 1 to 14 was all good, and they were qualified as products. In particular, the molded containers of Example 3, Example 8, Example 9, and Examples 11 to 14 were excellent in dimensional stability of the identification mark.

In the forming container of Example 4 and Example 9, due to the amount of carbon black contained in the printing ink, some mottled and some smudges were observed on the slightly square mark of the identification mark, but as far as the product is concerned, it is within the range of no influence. Abnormalities were not observed at all in the molded containers of other Examples and Comparative Examples.

In the molded containers of Examples 1 to 11, the height of the main body portion was all 30 mm or more, and they could be molded to the extent that the inner capacity was sufficiently ensured, so it was judged that the moldability of the container was also good. In the molded containers of Examples 12 to 14, the height of the main body is less than 30 mm but more than 26 mm, so it is judged that there is no problem in practical use as a product.

From the above results, it can be seen that in the molded containers of all the examples satisfying the above condition 1), the dimensional stability of the identification mark, the printability of the identification mark, and the formability of the container all showed good results without affecting the product. It can be further seen that in the molded containers of Examples 3, 8, 9, and 11 that fully satisfy the above-mentioned conditions 1) to 4), the dimensional stability of the identification mark, the printability of the identification mark, and the formability of the container are all exhibited. produce excellent results.

On the other hand, in the molded containers of Comparative Examples 1 to 6 that did not satisfy the condition of 1) above, any one of identification mark dimensional stability, identification mark printability, and container moldability showed poor results.

1: Laminated packaging material 11:Sealing layer 12: Adhesive layer 13: Barrier layer 14: Adhesive layer 15: Identification mark 16: Protective layer 2: Forming container 20:Accommodating Department 21: opening 22: Flange 23: Body Department 24: bottom 3: Contents 4: cover 41: tongue 5: Package body B: Blank F: Synthetic resin film S: round X: ring heat seal Z: Arrow

Fig. 1 shows the embodiment of the shaped container of the present invention, (a) is a vertical sectional view, and (b) is a perspective view viewed from below. Fig. 2 is a partially cutaway perspective view showing a specific example of a package using the molded container of the present invention. Figure 3 is a schematic enlarged display of a specific example of the laminated packaging material used in the manufacture of the shaped container of the present invention, (a) is a sectional view cut in a direction perpendicular to the surface, (b) is a A perspective view in which a part is cut and displayed in a direction perpendicular to the surface. Fig. 4 is a plan view showing a synthetic resin film as a protective layer of a laminated packaging material used in the manufacture of molded containers according to Examples and Comparative Examples of the present invention.

1: Laminated packaging material

11:Sealing layer

12: Adhesive layer

13: Barrier layer

14: Adhesive layer

15: Identification mark

16: Protective layer

Claims (9)

A shaped container is provided with a body portion and a bottom surrounded by the lower end of the body portion and has an accommodating portion opening upward to accommodate contents. The shaped container is formed by covering the A laminated packaging material comprising a sealing layer on one side of the barrier layer and a protective layer formed of a synthetic resin film and covering the other side of the barrier layer is pressed so that the protective layer faces outside the main body and the bottom of the container. formed; the tensile strength (δ1 _{( MD )} ) and the tensile strength (δ1 _{( TD )} ) are all 500Mpa～2500Mpa, and these ratios (δ1 _{( MD )} /δ1 _{( TD )} ) are 0.9～1.1, at least the surface of the synthetic resin film facing the barrier layer side can be printed with ink The method of identifying from the other side of the synthetic resin film is formed with an identification mark composed of at least any one of characters, graphics, symbols and patterns, and at least one of the main body part and the bottom part of the accommodating part On the part, the identification mark is marked in a manner that can be recognized from the outside. The molded container according to claim 1, wherein the synthetic resin film has a tensile strength at break (δ2 ₍ MD ₎ ) in the direction of travel ( _MD ) and a tensile strength at break (δ2) in the width direction (TD) (δ2 _{( TD )} ) are all 30Mpa ~ 70Mpa, and the ratio (δ2 _{( MD )} /δ2 _{( TD )} ) is 0.9 ~ 1.1. The molded container according to claim 1, wherein the tensile elongation at break point (E _{( MD )} ) of the synthetic resin film in the direction of travel (MD) and the tensile elongation at break point in the width direction (TD) are (E _{( TD )} ) are both 500% to 900%, and their ratio (E _{( MD )} /E _{( TD )} ) is 0.8 to 1.2. The molded container according to claim 1, wherein the heating dimensional change rate (CTE _{( MD )} ) of the synthetic resin film in the traveling direction (MD) is -2.0% to 1.5% under the measurement conditions of 90°C and 30 minutes , and its heating dimensional change rate (CTE ₍ TD ₎ ) in the width direction ( _TD ) is -1.5% to 1.5% under the same measurement conditions, and the difference between these (CTE _{( MD )} -CTE _{( TD )} ) The absolute value is below 1.5%. The molded container according to claim 1, wherein only one of the two sides of the synthetic resin film is formed with an identification mark, and the coefficient of dynamic friction of the other side not formed with the same identification mark is 0.1-0.5. The molded container according to claim 1, wherein the synthetic resin film is a single-layer or multi-layer film formed of polyolefin. The shaped container according to claim 1, wherein an adhesive layer exists between the barrier layer and the protective layer. A package comprising: a shaped container comprising the shaped container according to any one of claims 1 to 7 and containing contents in the containing portion; and a cover covering the containing portion of the shaped container The opening is heat-sealed on the upper end of the main body of the accommodating part. A method of manufacturing a shaped container, which is a method of manufacturing a shaped container with a body portion and a bottom surrounded by the lower end of the body portion and an accommodating portion that opens upward to accommodate contents, wherein a metal foil is prepared. A laminated packaging material comprising a barrier layer formed, a sealing layer covering one side of the barrier layer, and a protective layer formed of a synthetic resin film covering the other side of the barrier layer, as the composite of the protective layer of the laminated packaging material Resin film, the tensile strength (δ1 ₍ MD ₎ ) in the direction of travel ( _MD ) and the tensile strength (δ1 ₍ TD ₎ ) in the width direction ( _TD ) are both 500Mpa to 2500Mpa and the ratio of ( δ1 _{( MD )} /δ1 _{( TD )} ) is 0.9 to 1.1, at least the surface of the synthetic resin film facing the barrier layer side can be identified from the surface of the synthetic resin film facing the other side by printing ink An identification mark consisting of at least any one of characters, graphics, symbols and patterns is formed in a manner, and the protective layer is pressed to face the outside of the main body and the bottom of the housing part.

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