CN219884341U - Molded containers and packaging bodies - Google Patents

Abstract

The utility model relates to a molded container and a packaging body. A cup-shaped molded container (2) formed by pressing a laminated packaging material (1). The laminated packaging material has a barrier layer (13), a protective layer (16) and a sealing layer (11). The protective layer consists of The tensile strength (δ1(MD)) and (δ1(TD)) in the flow direction ( _MD ) and width direction ( _TD ) are both 500MPa to 2500MPa, and their ratio (δ1( _MD )/δ1( _TD )) is 0.9 A synthetic resin film of ~1.1 is formed and covers one side of the barrier layer, and the sealing layer covers the other side of the barrier layer. An identification mark (15) is printed in advance with printing ink on at least the barrier layer side surface of the protective layer. This molded container has good moldability, and the identification mark displayed on the molded container has good dimensional stability.

Description

Molded containers and packaging bodies

Technical field

The present invention relates to a molded container. More specifically, it relates to a cup-shaped molded container formed by pressing a laminated packaging material including a barrier layer formed of a metal foil such as aluminum foil.

In this specification and the claims, the "inside" refers to the inside of the accommodating portion for accommodating the contents in the molded container of the present invention, and the "outside" refers to the opposite side. In addition, let the direction indicated by the arrow Z in FIG. 2(a) be upward, and let the opposite side be downward. Furthermore, the term "aluminum" refers to aluminum alloys in addition to pure aluminum.

Background technique

As a sealed package for storing contents (hereinafter referred to as "contents" with the same meaning) such as food, pharmaceuticals, sanitary products, and electronic components, for example, a molded container with an outer peripheral edge covering the opening of the molded container is used. A packaging body formed by a lid material fixed to a flange portion of a molded container formed by a cup-shaped receiving portion and an outward-facing flange portion integrally provided on the upper end of a main body portion, the cup-shaped receiving portion being formed by the main body A bottom portion and a bottom portion surrounded by the lower end of the main body portion are formed and open at the top to accommodate the contents.

Generally speaking, the molded container of the above-mentioned package is formed from a laminate for containers, and is made of a low-cost, lightweight, and high-strength laminated packaging material that has an excellent barrier effect against light, moisture, oxygen, etc., with a protective layer facing the outside. The container laminate is manufactured by performing press processing in a manner in which a synthetic resin film serving as a protective layer is laminated on one side of a barrier layer made of aluminum foil, and a synthetic resin serving as a sealing layer is laminated on the other side of the barrier layer. Made of membrane.

Among the above-mentioned packages, in particular, a heat-sealing type package in which the outer peripheral edge portion of the cover material is heat-sealed to the flange portion of the molded container is excellent in sealing properties. Patent Document 1 discloses an example of such a heat-sealing type package. The package described in Patent Document 1 is a package formed of a flanged molded container and a lid. The flanged molded container is made of polyethylene terephthalate film, aluminum foil, or modified polypropylene film. A laminated packaging material in which a polypropylene film and a polypropylene film are sequentially dry-laminated are molded so that the polypropylene film is the innermost side. The cover is a cover that covers at least one side of a barrier layer made of aluminum foil with a sealing layer. It is formed of a laminated body, and the outer peripheral edge portion is heat-sealed to the flange portion of the molded container so as to cover the opening of the molded container.

In addition, for various purposes, an identification mark may be provided on the molded container in a manner visible from the outside. For example, some means can be used to provide identification marks such as characters, graphics, symbols, patterns, etc. on the outer surface of the main body of the molded container to display the name, description (quality, ingredients, precautions, etc.), design, etc. of the contents. trademark. Moreover, this display can give the package the ability to identify, increase the desire of consumers to purchase, and ensure the quality of the contents.

As a means of giving an identification mark to the molded container, the following methods can be considered: affixing a sheet with the identification mark pre-printed on the outer surface of the molded container, or using printing ink to form the identification mark on the outer surface of the molded container. However, since Both require time and dedicated machines, so they are not economical. Therefore, a molded container was produced by preparing a laminated packaging material in which an identification mark visible from the outside of the protective layer was printed in advance on a translucent synthetic resin film that serves as a protective layer of the molded container. This laminated packaging material is placed on a pressing mold so that the synthetic resin film serving as the protective layer is on the outside, and, for example, is subjected to a deep drawing process to have an identification mark visible from the outside. The aforementioned identification mark is often given exclusively to the main body of the molded container, but depending on the purpose, it may also be located on the bottom or flange portion.

existing technical documents

patent documents

Patent Document 1: Japanese Patent No. 2866916

Utility model content

Problems to be solved by utility models

However, when a blank made of a laminated packaging material with an identification mark printed on a synthetic resin film serving as a protective layer is pressed to produce a molded container with a flange, the laminated packaging material expands and contracts along the shape of the mold. , so the following problems will occur. That is, for example, if a laminated packaging material for obtaining a flanged molded container is subjected to a deep drawing process, a compressive force acts on a region of the laminated packaging material corresponding to the flange portion of the molded container. , a large stretch is applied to the area corresponding to the main body and the bottom of the accommodation part. As a result, the identification mark printed on the synthetic resin film that serves as the protective layer of the laminated packaging material also expands and contracts accordingly. The result is that the identification mark is severely deformed, broken, blurred, and unclear.

Therefore, in order to prevent the identification mark from being severely deformed, broken, blurred, and unclear, when printing the identification mark on the synthetic resin film that serves as the protective layer, it must be considered that the identification mark may be severely deformed during the pressing process. Furthermore, it is also necessary to anticipate the shape in which the identification mark will be displayed on the molded container after the pressing process. A direct means to solve this problem is to optimize the design and control program of the machine for printing identification marks on synthetic resin films. However, since it requires time and cost, it cannot be said to be the best method.

In addition, when a laminated packaging material in which an identification mark is printed on a synthetic resin film serving as a protective layer is pressed, strong stress acts on the laminated packaging material, so that the resulting molded container may be subject to stress in the thickness direction. delamination occurs in the middle part. In addition, if the synthetic resin film that serves as the protective layer of the laminated packaging material is too hard, the laminated packaging material cannot be fully stretched during press processing, so the height of the resulting molded container (the depth of the accommodating portion) may not be ensured.

A first object of the present invention is to provide a molded container in which the identification mark displayed does not undergo deformation, misalignment, etc., or has little deformation, misalignment, etc., and has dimensional stability (hereinafter also referred to as identification mark dimensional stability). good.

In addition, a second object of the present invention is to provide a molded container in which delamination does not occur in the middle of the thickness direction of the main body and the bottom of the accommodating part and in which the height of the main body (the depth of the accommodating part), etc., can be sufficiently ensured. The moldability (hereinafter sometimes referred to as container moldability) is good.

Means used to solve problems

The inventor of the present application repeatedly conducted various studies and found that the aforementioned two objectives can be achieved by optimizing the physical properties of the synthetic resin film used as the protective layer of the laminated packaging material, thereby completing the present utility model. The present utility model is composed of the following way composition.

1), a molded container, which is provided with a container formed by a main body and a bottom surrounded by the lower end of the main body, and opening at the top to accommodate the contents. The molded container is formed by having a barrier layer formed of a metal foil , a laminated packaging material in which a sealing layer covering 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 are pressed so that the protective layer faces the outside of the main body and the bottom of the accommodating part. The characteristics of the aforementioned molded container formed by processing are:

The tensile strength (δ1 _{(MD)) in the flow direction (MD} ) and the tensile strength (δ1 _(TD) ) in the width direction (TD) of the synthetic resin film forming the protective layer of the laminated packaging material are both 500 MPa. ~2500MPa, and the ratio of δ1 _(MD) to δ1 _(TD ) (δ1 _(MD) /δ1 _(TD) ) is 0.9 ~ 1.1, on at least the surface of the synthetic resin film facing the barrier layer side, use printing ink to An identification mark consisting of at least any one of letters, graphics, symbols, and patterns is formed so as to be visible from the surface facing the other side of the synthetic resin film, and is provided on the main body portion and the bottom portion of the accommodating portion. At least one of the parts is displayed with the aforementioned identification mark in a manner that is visible from the outside.

2) The molded container according to 1) above, wherein the synthetic resin film has a tensile strength at break (δ2 _(MD)) in the flow direction (MD) and a tensile strength at break (δ2 (TD) in the width direction ₍ TD) ₎ ) are both 30MPa to 70MPa, and the ratio of δ2 _(MD) to δ2 _(TD) (δ2 _(MD) /δ2 _(TD ) is 0.9 to 1.1.

3). The molded container according to 1) above, wherein the synthetic resin film has an elongation at break (E (MD)) in the flow direction (MD ₎ and an elongation at break (E (TD) in the width direction _(TD ). ₎ ) are both 500% to 900%, and the ratio of E _(MD) to E _(TD) (E _(MD) /E _(TD) ) is 0.8 to 1.2.

4) The molded container according to the above 1), wherein the heating dimensional change rate (CTE _(MD) ) of the synthetic resin film in the flow direction (MD) is -2.0% to -2.0% under the measurement conditions of 90°C and 30 minutes. 1.5%, and the 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 CTE _(MD) and CTE _(TD) (CTE _{(MD) )} -The absolute value of CTE _(TD) ) is 1.5% or less.

5) The molded container according to 1) above, wherein the synthetic resin film has an identification mark formed on only one of its two sides, and the other side without the same identification mark has a dynamic friction coefficient of 0.1 to 0.5.

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

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

8) A package including a molded container and a lid. The molded container is formed from the molded container according to any one of 1) to 7) above and contains contents in the accommodating portion. The lid covers the molded container. The opening of the accommodating part is heat-sealed on the upper end of the main body of the accommodating part.

9) A method of manufacturing a molded container, which is a method of manufacturing a molded container provided with a container, the container being formed by a main body and a bottom surrounded by the lower end of the main body, and opening at the top to accommodate the contents, as described above The manufacturing method is characterized by,

A laminated packaging material having a barrier layer made of metal foil, a sealing layer covering one side of the barrier layer, and a protective layer made of a synthetic resin film and covering the other side of the barrier layer is prepared as the laminated packaging material. The aforementioned synthetic resin film of the aforementioned protective layer has a tensile strength (δ1 (MD _{)) in the flow direction (MD) and a tensile strength (δ1 (} TD)) in the width direction ( _TD) of 500MPa to 2500MPa and δ1 _(MD) . ₎ to δ1 _(TD) (δ1 _(MD) /δ1 _(TD) ) is a synthetic resin film of 0.9 to 1.1, using printing ink on at least the surface of the synthetic resin film facing the barrier layer side from the aforementioned synthetic resin film. An identification mark composed of at least any one of characters, graphics, symbols, and patterns is formed in advance on the surface of the resin film facing the other side in such a way that it can be seen, with the protective layer facing the outside of the main body and the bottom of the housing portion. method to implement pressing processing.

The effect of utility model

In the molded container of 1) above, the synthetic resin film that serves as the protective layer of the laminated packaging material used is characterized by tensile strength (MPa) in its flow direction (MD) and width direction (TD) (hereinafter also referred to as Characteristic composition 1). That is, both tensile strengths are limited to the same range, and the ratio of the two tensile strengths is also limited to a predetermined range.

Therefore, when the synthetic resin film is supplied to a rotary machine for printing identification marks, it is stretched in the flow direction (MD). However, since the synthetic resin film has the aforementioned characteristic structure 1, the stretching in the MD direction Long is relatively suppressed. On the other hand, if a laminated packaging material with a synthetic resin film printed with an identification mark as a protective layer is supplied to a pressing mold, it will be stretched moderately during the molding process.

Moreover, according to such adjustment, the molded container of the above 1) has good container formability, no deformation, misalignment, etc. on the displayed identification mark, and the dimensional stability of the identification mark is also good. In addition, the identification mark has no or little blurring, unclearness, cracking, etc. on the printing ink layer forming the identification mark, and the printability (hereinafter also referred to as identification mark printability) is also good.

In the molded container of 2), the tensile strength at break of the synthetic resin film that serves as the protective layer of the laminated packaging material used in the flow direction (MD) and the width direction (TD), that is, the breaking tensile strength (MPa) ) also has features (hereinafter also referred to as feature configuration 2). That is, the two tensile strengths at break are limited to the same range, and the ratio of the two tensile strengths at break is also limited to a predetermined range. Therefore, container formability and identification mark dimensional stability are appropriately balanced, and the identification mark printability is also good.

In the molded container of 3), the elongation at break of the synthetic resin film that serves as the protective layer of the laminated packaging material used in the flow direction (MD) and the width direction (TD), that is, the breaking elongation (% ) also has features (hereinafter also referred to as feature configuration 3). That is, both elongations are limited to the same range, and the ratio of both tensile strengths is also limited to a predetermined range. Therefore, both container formability and identification mark dimensional stability are appropriately balanced, and the identification mark printability is also good.

In the molded container of 4), the synthetic resin film that serves as the protective layer of the laminated packaging material used is further characterized by its heating dimensional change rate (%) in the flow direction (MD) and the width direction (TD) (hereinafter Also called feature composition 4). That is, both heating dimensional change rates are limited to a predetermined range, and the absolute value of the difference between the two heating dimensional change rates is also limited to a predetermined range. Therefore, even if heat is applied to the synthetic resin film in the drying process of the ink after printing the identification mark, the elongation and contraction in the flow direction (MD) and the width direction (TD) become uniform throughout, so It also does not impair the adhesion of the identification mark (printed layer) of the synthetic resin film. As a result, the molded container of the above 4) also has an appropriate balance between container moldability and identification mark dimensional stability, and the identification mark printability is also good.

In the molded container of 5), the identification mark is formed on only one of the two sides of the synthetic resin film that serves as the protective layer of the laminated packaging material used, and the dynamic friction coefficient of the side without the same identification mark is limited to a prescribed range. , therefore, during the pressing process to form a molded container, the aforementioned synthetic resin film exhibits moderate sliding and elongation, suitably balancing container formability and identification mark dimensional stability. Furthermore, since excessive local load is not applied to the synthetic resin film, the identification mark is not deformed, broken, blurred, unclear, etc., and the identification mark printability is also good.

In the molded container of 6), the synthetic resin film that becomes the protective layer of the laminated packaging material used is a single-layer or multi-layer film made of polyolefin. Therefore, it is appropriate to balance the moldability of the container and the dimensional stability of the identification mark, and the identification The logo printability is also good.

In the molded container of 7), an adhesive layer is sandwiched between the barrier layer and the protective layer of the laminated packaging material used. Therefore, the occurrence of delamination near the identification mark can be suppressed, and the moldability of the container is particularly good. In addition, the identification mark dimensional stability and identification mark printability are also excellent.

The package according to 8) also has good dimensional stability and printability of the identification mark displayed on the molded container.

According to the manufacturing method of the molded container of 9), the molded container of the above 1) can be molded relatively easily while ensuring the dimensional stability of the identification mark and the printing characteristics of the identification mark.

Description of the drawings

FIG. 1 shows an embodiment of the molded container of the present invention. (a) is a vertical cross-sectional view and (b) is a perspective view viewed from below.

2 is a partially cutaway perspective view showing a specific example of a package using the molded container of the present invention.

3 is a schematic enlarged view of a specific example of the laminated packaging material used for manufacturing the molded container of the present invention. (a) is a cross-sectional view cut in a direction perpendicular to the surface, and (b) is a cross-sectional view cut in a direction perpendicular to the surface. A perspective view showing a section cut away perpendicular to the surface.

4 is a plan view showing a synthetic resin film used as a protective layer of a laminated packaging material used in the production of molded containers according to Examples and Comparative Examples of the present invention.

Explanation of reference signs

1: Laminated packaging materials

11:Sealing layer

12: Adhesive layer

13: Barrier layer

14: Adhesive layer

15: Identification mark

16: Protective layer

2: Forming container

20: Containment Department

21: Open your mouth

23: Main part

24: Bottom

3: Contents

4: cover

5: Packaging body

Detailed ways

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

Figure 1 shows a specific example of the molded container of the present invention, Figure 2 shows a specific example of a package using the molded container of the present invention, and Figure 3 shows the layers used in manufacturing the molded container of the present invention. A specific example of pressure packaging materials.

In FIG. 1 , the molded container 2 is provided with a receiving portion 20 and an outward flange portion 22 . The receiving portion 20 is formed by a main body 23 and a bottom 24 surrounded by the lower end of the main body 23 , and is open at the top to accommodate the contents. The aforementioned outward flange portion 22 is integrally formed in an outwardly protruding shape at the upper end of the main body portion 23 at the peripheral portion of the opening 21 of the receiving portion 20. The aforementioned molded container 2 is formed with an outer surface of the main body portion 23 that can be viewed from the outside. Recognized identification mark 15.

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 drawing ratio may be about 0.45 to 0.8, and the height of the main body 23 may be about 10 to 50 mm. The shape and size of the bottom 24 are not particularly limited either. 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 the case of the circular opening 21 , the diameter may be about 20 to 140 mm. The shape and size of the flange portion 22 are not particularly limited either. For example, the shape may be similar to the opening 21. In this case, the width dimension may be about 3 to 15 mm. An R portion 25 having a predetermined radius of curvature may be formed at the boundary between the main body portion 23 and the bottom portion 24 . The radius of curvature of the R portion 25 is not particularly limited, and may be about 0.5 to 20 mm. The steps 26 can be optionally provided on the main body 23 . In addition, steps 27 may be optionally provided on the bottom 24 .

The identification mark 15 is any one of characters, graphics, symbols, and patterns or a combination thereof. The identification mark 15 may be of a single color or of multiple colors. The size of the identification mark 15 is not particularly limited. Specific examples of the identification mark 15 include the name, description (quality, ingredients, precautions, etc.) of the content 3, a design with a design nature, a seal, a logo, a trademark, a trade name, a unified beautification mark, and legal Specified container and packaging identification marks (for example: aluminum recycling mark), environmental protection marks, etc. It should be noted that, as shown in FIG. 1( b ), the identification mark 15 only needs to be displayed on at least the main body part 23 , but may also be displayed on the outside of the flange part 22 and the outside of the bottom part 24 .

As shown in FIG. 2 , the molded container 2 can be used as a packaging body 5 by accommodating the contents 3 in the accommodating portion 20 and heat-sealing the outer peripheral edge portion of the lid 4 to the entire upper surface of the flange portion 22 . Examples of the content 3 include foods, pharmaceuticals, chemical products, electronic components, batteries, sanitary products, and other industrial products. Examples of food include cream cheese, butter, jelly, yokan, pudding, miso, curry, pasta paste, juice, salad dressing, and the like. The form of the content 3 is also not limited, and may be liquid, semi-solid, or solid. An annular heat-sealed portion X with a predetermined width is formed between the lower surface of the cover 4 and the upper surface of the flange portion 22 , and the cover 4 and the flange portion 22 are heat-welded in the heat-sealed portion X. It should be noted that the opening finger portion 41 is provided on the lid 4 so as to protrude outward from the flange portion 22, and the lid 4 is peeled off from the flange portion 22 of the molded container 2 by holding the opening finger portion 41. Unseal the packaging body 5 .

The molded container 2 is manufactured by subjecting a blank punched out of the laminated packaging material 1 shown in FIG. 3 to a pressing process such as deep drawing and embossing. The circle shown by the one-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 molded container 2 to be molded.

The laminated packaging material 1 includes a barrier layer 13, a sealing layer 11, and a protective layer 16. The barrier layer 13 protects the contents 3 of the packaging body 5 from being affected by gas, water vapor, light, etc., and the sealing layer 11 is separated by adhesive. The adhesive layer 12 is provided to cover one side of the barrier layer 13 , and the protective layer 16 is provided to cover the other side of the barrier layer 13 via the adhesive layer 14 and has light transmittance. Among the two sides of the protective layer 16 At least the surface facing the barrier layer 13 side, in this embodiment only the surface facing the barrier layer 13, is printed with an identification mark 15 formed of at least any one of characters, graphics, symbols and patterns using printing ink. . For the laminated packaging material 1, the protective layer 16 is located on the outer surface side of the main body part 23 and the bottom part 24, and on the lower surface side of the outward flange part 22, and the sealing layer 11 is located on the inner surface of the main body part 23 and the bottom part 24. The molded container 2 is manufactured by performing pressing processing such as deep drawing processing and embossing processing on the surface side and the upper surface side of the outward flange portion 22 . The identification mark 15 can be viewed from the outside through the protective layer 16 .

The barrier layer 13 of the laminated packaging material 1 is a layer for protecting the contents 4 of the packaging body 5 from gas, water vapor, light, etc., and is formed of metal foil such as aluminum foil, copper foil, iron foil, etc., and aluminum foil is preferably used. . As the aluminum foil, it is particularly preferable to use a foil made of a soft material (O material) of 1000 series, 3000 series or 8000 series aluminum specified in JIS H4160:1994. Specific examples include A8021H-O material, A8079H-O material, A1N30H-O material, and the like.

A base layer (not shown) made of a predetermined chemical conversion treatment liquid is formed on one or both sides of the aluminum foil.

Examples of the chemical conversion treatment liquid include a water-alcoholic solution containing phosphoric acid, a chromium-based compound, a fluorine-based compound, and/or a binder resin. Examples of the chromium-based compound include chromic acid and/or chromium (III) salts. Examples of the fluorine-based compound include metal salts of fluoride and/or non-metal salts of fluoride. Examples of the binder resin include At least one resin selected from the group consisting of an acrylic resin, a chitosan derivative resin, and a phenolic resin is selected. The usage amount of the chemical conversion treatment liquid is not particularly limited. As long as the adhesion amount of the chromium-based compound is in the range of 0.1 mg/m ² to 50 mg/m ² per side of the aluminum foil.

The thickness of the barrier layer 13 is not particularly limited, but is usually 50 μm to 200 μm in consideration of dead hold properties of the laminated packaging material 1, container formability, and strength of the molded container 2.

The adhesive layer 12 interposed between the barrier layer 13 and the sealing layer 11 of the laminated packaging material 1 is formed of an adhesive. It should be noted that the adhesive layer 12 is an arbitrary layer and is not necessarily required.

Examples of the adhesive forming the adhesive layer 12 include vinyl chloride-vinyl acetate copolymer adhesives, polyester adhesives, epoxy adhesives, polyolefin adhesives, and polyester adhesives. Urethane adhesive, etc. Among them, polyurethane resin-based adhesives are preferred, and in particular, two-liquid curable polyurethane resin-based adhesives are preferred because they are excellent in suppressing delamination. A polyol can be used as the main component of the two-liquid curable polyurethane resin adhesive, and polyisocyanate can be used as the curing agent. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, and polyester polyols are particularly preferred. Examples of polyisocyanates include aliphatic diisocyanates, aromatic diisocyanates, alicyclic diisocyanates, and dimers or trimers of each. The thickness of the adhesive layer 12 is not particularly limited, but is usually 2 μm to 5 μm from the viewpoint of preventing delamination between the sealing layer 11 and the barrier layer 13 and balancing the overall rigidity and elongation of the sealing layer 11 and the protective layer 16 . .

The sealing layer 11 of the laminated packaging material 1 is made of heat-fusible resin and is provided on the entire inner surface of the main body 23 and the bottom 24 of the housing portion 20 of the molded container 2 to the entire upper surface of the flange portion 22 .

Examples of the thermally adhesive resin constituting the sealing layer 11 include polyolefin, polyvinyl alcohol, polysulfone, polystyrene, and the like. Among them, polyolefins are preferred, and examples thereof include homopolypropylene, propylene-ethylene block copolymers, propylene-ethylene random copolymers, and polyethylene. Examples of the polyethylene include low-density polyethylene, medium-density polyethylene, and high-density polyethylene. It should be noted that the polyolefin may be an acid-modified type.

The thermally fusible resin may contain a filler, and examples of the filler include clay, silica, talc, titanium dioxide, carbon black, and the like.

In addition, the heat-sealable resin may also contain an elastomer. Examples of the elastomer include styrene-based elastomers, olefin-based elastomers, and the like.

The sealing layer 11 may be a single layer formed of the same type of heat-fusible resin, or may be a multilayer in which two or more layers of the same or different types of heat-fusible resins are laminated. The number of multi-layers is not particularly limited, but is usually about 1 to 5.

The overall thickness of the sealing layer 11 is not particularly limited, but may be determined from the aspects of heat-sealing properties (sealing properties of the packaging body 5 ), buffering properties of the sealing layer 11 , and the overall balance of rigidity and elongation of the sealing layer 11 and the protective layer 16 . Usually 30μm～400μm.

The adhesive layer 14 interposed between the barrier layer 13 and the protective layer 16 of the laminated packaging material 1 is formed of an adhesive. It should be noted that the adhesive layer 14 is an arbitrary layer and is not necessarily required. The adhesive layer 14 can effectively prevent delamination between the barrier layer 13 and the protective layer 16 during the molding process of the laminated packaging material 1 . At the same time, the dimensional stability of the identification mark after the molding process also becomes good, especially the dimensional stability of the identification mark 15 of the molded container 2 is optimized.

As the adhesive forming the adhesive layer 14 , the same adhesive as the adhesive forming the adhesive layer 12 can be used. In particular, a two-liquid curable polyurethane resin-based adhesive is preferred because it contributes to moldability. A polyol can be used as the main component of the two-liquid curable polyurethane resin adhesive, and polyisocyanate can be used as the curing agent. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, and polyester polyols are particularly preferred. Examples of polyisocyanates include aliphatic diisocyanates, aromatic diisocyanates, alicyclic diisocyanates, and dimers or trimers of each.

The thickness of the adhesive layer 14 is not particularly limited. It depends on the adhesion of the identification mark 15 to the barrier layer 13, the followability of the identification mark 15 to the barrier layer 13 during the molding process of the laminated packaging material 1, and the protection between the barrier layer 13 and the barrier layer 13. From the viewpoint of suppressing delamination between the layers 16, it is usually 2 μm to 5 μm.

The protective layer 16 of the laminated packaging material 1 is formed of a synthetic resin film and is provided on 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 its surface on the barrier layer 13 side. Since the identification mark 15 is located on the molded container 2 and needs to be visible from the outside, it is a translucent film.

The aforementioned synthetic resin film may be of a stretched type or a non-stretched type. Specific examples include polyolefin films, polyester films, and polyamide films, with polyolefin films being preferred. Examples of the polyolefin film include a homopolypropylene film, a propylene-ethylene block copolymer film, a propylene-ethylene random copolymer film, and a polyethylene film. Examples of the polyethylene film include a low-density polyethylene film. , linear low density polyethylene film, medium density polyethylene film, high density polyethylene film. It should be noted that the polyolefin membrane may be an acid-modified type. Examples of the polyester film include polyethylene terephthalate film, PTT (polytrimethylene terephthalate film), polybutylene terephthalate film, and the like. Examples of polyamide films include nylon films. Particularly when the depth of the accommodating portion 20 of the molded container 2 is deep and about twice the diameter, it is preferable to use a propylene-ethylene block copolymer film or a propylene-ethylene random copolymer film.

The synthetic resin film may contain an elastomer, and examples of the elastomer include styrene-based elastomers, olefin-based elastomers, and the like. If an elastomer is included, impact resistance can be ensured and the effect of preventing blushing can be enhanced.

In the synthetic resin film, various known waxes and/or surfactants as lubricants may be kneaded in advance, or may be coated on the surface of the synthetic resin film by spraying or other methods. In this case, sliding properties can be ensured and container formability can be improved. Examples of the wax include natural wax and/or synthetic wax. Examples of synthetic waxes include hydrocarbon-based synthetic waxes, hydrogenated waxes, silicone-based waxes (silicone waxes), fluorine-based waxes, fatty acid amide-based waxes, and the like. Examples of the surfactant include at least one selected from the group consisting of anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. The lubricant can also be used as a means for realizing feature structure 5 described below.

As long as the light transmittance is not excessively impaired and the external visibility of the identification mark 15 can be ensured, the synthetic resin film may contain a coloring material described later.

The protective layer 16 may be a single layer formed of the same type of synthetic resin film, or may be a multi-layer structure in which two or more layers of the same type or different type of synthetic resin film are laminated. The number of multi-layers is not particularly limited, but is usually about 1 to 5.

The thickness of the protective layer 16 is not particularly limited, but is usually 12 μm to 200 μm in view of the elongation during the press processing of the laminated packaging material 1 and the rigidity of the molded container 2 .

The printing ink used to form 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.

Examples of the binder resin include polyurethane resins, acrylic resins, epoxy resins, polyolefin resins, polystyrene resins, polyvinyl chloride resins, polyamide resins, and polycarbonate resins. At least one of the group consisting of phenolic resin and polyester resin (polyethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.), which can be used A type that uses active energy rays for curing may also be a type that uses heat instead of active energy rays for curing. In addition, a normal temperature curing type binder resin can also be used, such as cellulose-based resin (cellulose, etc.), acrylic varnish resin, and novolak resin.

Among the aforementioned binder resins, polyurethane resin is preferred, and two-component curable polyurethane resin is particularly preferred. In this case, setting the Young's modulus (JIS K7162) of the cured film to 70 MPa to 400 MPa can improve the effect of suppressing the identification mark 15 from falling off or cracking from the protective layer 16 during press processing. Polyol is used as the main agent of the two-liquid curing polyurethane resin, and polyisocyanate is used as the curing agent. Examples of polyols include acrylic polyols, polyester polyols, polyether polyols, and the like, and polyester polyols are particularly preferred. Examples of polyisocyanates include aliphatic diisocyanates, aromatic diisocyanates, alicyclic diisocyanates, and dimers or trimers of each.

It is preferable that the Young's modulus (JIS K7162) of the cured film of the binder resin is 70 MPa to 400 MPa because the identification mark 15 will not fall off or crack from the protective layer 16 during press processing. From this viewpoint, the cured film preferably has a tensile strength at break (JIS K7161) of 25 MPa to 60 MPa and an elongation at break of 50% to 400%.

Examples of the coloring material include pigments and/or dyes. Examples of the pigment include titanium dioxide, zinc oxide, glossy white, pyrite, barium carbonate, calcium carbonate, precipitated silica, Aerosil, talc, alumina white, mica, synthetic calcium silicate, magnesium carbonate, barium carbonate, Carbon black, magnetite, iron oxide red and other organic or inorganic pigments. Examples of dyes include anthraquinone-based dyes, azo-based dyes, quinoline-based dyes, and the like. The content of the coloring material in the printing ink is not particularly limited. From the viewpoint of appearance such as the clarity of the identification mark 15, it is usually 10 to 60 mass%, preferably 15 to 50 mass%.

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

An example of a means for forming the identification mark 15 by applying printing ink to at least the inner surface of the synthetic resin film is gravure printing. In addition, printing ink may be additionally printed on the outer surface of the synthetic resin film.

In addition, the synthetic resin film serving as the protective layer 16 exhibits the following behavior in each of the printer that prints the identification mark 15 and the press that forms the molded container 2 .

First, after printing the identification mark 15 on the synthetic resin film in a printing machine, when winding it up with a roller, tension is applied to the synthetic resin film in its flow direction (MD). Therefore, if the synthetic resin film is assumed to be too soft, will be overstretched on the printing press. As a result, the identification mark 15 cannot follow the elongation of the synthetic resin film, resulting in a corresponding decrease in the adhesion force between the two.

In addition, if the blank formed of the laminated packaging material 1 is subjected to, for example, deep drawing processing with a press, the portion corresponding to the flange portion 22 of the molded container 2 in the planned molding area of the laminated packaging material 1 is compressed. , on the contrary, the portions corresponding to the main body portion 23 and the R portion 25 are stretched. At this time, the identification mark 15 will also shrink or extend along the deformation direction of the laminated packaging material 1, although this is also affected by its position. As a result, the identification mark 15 is cracked or its shape is deformed.

In view of the above, the synthetic resin film serving as the protective layer 16 is provided with the following characteristic structure 1. Furthermore, it is considered that the characteristic structure 1 allows the molded container 2 to achieve both container formability and dimensional stability of the identification mark 15 .

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

In order to achieve a more appropriate balance between container formability and identification mark dimensional stability, the synthetic resin film serving as the protective layer 16 also has the following characteristic structure 2 and/or characteristic structure 3.

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

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

From the viewpoint of balancing the moldability of the container and the dimensional stability of the identification mark, it is particularly preferable that the synthetic resin film used as the protective layer 16 has all of the characteristic components 1, 2, and 3.

In addition, when the identification mark 15 formed on the synthetic resin film serving as the protective layer 16 is formed of heat-curing printing ink, a relatively high-temperature drying process is performed on the printed synthetic resin film. At this time, generally speaking, the synthetic resin film expands in the flow direction (MD) of the rotary machine and contracts in the width direction (TD). As a result, the adhesion force between the synthetic resin film and the identification mark 15 may also decrease accordingly. Although this is also affected by the type of synthetic resin used as the raw material.

In view of the above, the synthetic resin film that becomes the protective layer 16 may further have the following characteristic structure 4, so that it is easier to achieve both container formability and dimensional stability of the identification mark.

Characteristic structure 4: The heating dimensional change rate (CTE (MD)) of the synthetic resin film in the flow direction (MD) under the measurement conditions of 90°C and 30 minutes is limited to -2.0% to 1.5%, and the heating dimensional change rate (CTE _(MD) ) of the synthetic resin film is limited to -2.0% to 1.5% under the measurement conditions of 90°C and 30 minutes. The heating dimensional change rate (CTE _(TD) ) of the synthetic resin film in the width direction (TD) under the measurement conditions of minutes is limited to -2.0% to 1.5%, and the difference between them (CTE _(MD) -CTE _(TD) ) The absolute value is limited to 1.5% or less, that is, 0 to 1.5%, preferably 0 to 1.0%.

In addition, as mentioned above, if the blank formed of the laminated packaging material 1 is subjected to press processing, especially deep drawing processing, the synthetic resin film that becomes the protective layer 16 is compressed or stretched depending on the deformation direction of the molded container 2 . In consideration of the above, the synthetic resin film used as the protective layer 16 preferably has the following characteristic structure 5, so that both container formability and identification mark dimensional stability can be more appropriately achieved, and the identification mark printability can also be optimized. The dynamic friction coefficient can also be adjusted by using the aforementioned lubricant in combination.

Feature 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 production methods, such as dry lamination, melt extrusion lamination, thermal lamination, and the like, and these methods can also be combined.

Although not shown in the figure, one embodiment of the cover 4 is formed 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. Among them, one or both of the adhesive layers can be omitted.

The cover-side protective layer is located on the cover 4 and is a layer for protecting the package body 5 and its contents 3 from external impacts, etc., and is made of various known synthetic resins. As the synthetic resin, a synthetic resin that can satisfy the protective layer among synthetic resins derived from biomass and synthetic resins derived from fossil resources can be suitably used, and polyester and/or polyolefin are preferred. As the polyester, polyethylene terephthalate is preferred, and as the polyolefin, polyethylene, polypropylene, propylene-ethylene copolymer (block, random), and homopolypropylene are preferred. In addition, the protective layer may also be composed of an overcoating agent such as nitrocellulose, shellac resin, epoxy resin, urethane resin, chlorinated polyolefin resin, acrylic resin, and vinyl chloride-vinyl acetate copolymer. . The protective layer may be a single layer or a multi-layer composed of at least 2 independent layers. The thickness of the entire protective layer is not particularly limited, but is usually 5 μm to 30 μm.

The upper adhesive layer is an arbitrary layer sandwiched between the protective layer and the barrier layer, and can be bonded by the same adhesive as that used to form the two adhesive layers 12 (14) of the laminated packaging material 1. agent formation. The thickness of the upper adhesive layer is not particularly limited, but is usually 1 μm to 5 μm.

The cover-side barrier layer has the function of protecting the contents 3 of the package 5 from light, gas, water vapor, etc. together with the molded container 2 . The barrier layer is formed of, for example, metal foil, and iron foil, stainless steel foil, and aluminum foil can be used. In addition, a base layer made of the chemical conversion treatment liquid can be formed on one or both sides 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 an arbitrary layer interposed between the cover-side barrier layer and the cover-side sealing layer, and can be made of the same adhesive as the adhesive used in 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 sealing layer is a layer thermally welded to the sealing layer 11 present on the upper surface of the flange portion 22 of the molded container 2, and is made of various known heat-fusible resins. As the heat-fusible resin, the same heat-fusible resin as the heat-fusible resin that forms the sealing layer 11 of the molded container 2 can be used, and polyolefin is particularly preferably used. The cover-side sealing layer may be a single layer made of the same type of heat-fusible resin, or may be a multi-layer layer in which two or more layers of the same or different types of heat-fusible resins are laminated. The number of multi-layers is not particularly limited, but 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.

Another form of the cover 4 is to be formed of a cover-side protective layer, a cover-side barrier layer made of a metal vapor-deposited film, an adhesive layer, a cover-side barrier layer made of a metal vapor-deposited film, and a cover-side sealing layer in order from the upper side. The metal vapor deposition film can be directly formed on the lower surface of the cover side protective layer or directly on the upper surface of the sealing layer. Examples of the metal include aluminum and the like.

The cover 4 is formed by punching out a sheet material produced by various known methods such as dry lamination, melt extrusion lamination, thermal lamination, and gravure coating. The shape and size of the lid 4 are not particularly limited, and can be purposefully set according to the shape and size of the opening 21 and the flange portion 22 of the molded container 2 . An opening finger portion 41 may be provided on the periphery of the cap 4 (Fig. 3).

Example

Hereinafter, examples and comparative examples of the present invention will be described. However, the present invention is not limited to the examples.

In addition, in the description concerning the following Examples and Comparative Examples, the abbreviation which represents the synthetic resin film used as the protective layer of a laminated packaging material has the following meaning.

C-rPP: Non-stretch film formed by extruding a single layer of propylene-ethylene random copolymer

C-hPP: non-stretch film formed from extruded monolayers of homopolypropylene

LLDPE: A film formed by extruding a single layer of linear low-density polyethylene film

HDPE: Film formed by extruding a single layer of high-density polyethylene film

C-(rPP/bPP/rPP): A non-stretched co-extruded three-layer polypropylene film composed of a propylene-ethylene random copolymer layer, a propylene-ethylene block copolymer layer, and a propylene-ethylene random copolymer layer. O-Ny: stretch nylon membrane

C-PET: non-stretch crystalline polyethylene terephthalate film

O-PBT: Stretched polybutylene terephthalate film

O-PET: Stretched polyethylene terephthalate film

O-rPP: non-stretch film formed by extruding a single layer of propylene-ethylene random copolymer

Furthermore, in the following examples, as a printing ink used when printing an identification mark on a synthetic resin film that serves as a protective layer of a laminated packaging material, carbon black (CB) as a pigment and acrylic resin as a binder are used. An organic solvent-based heat-curable black ink dispersed in a medium. The meaning of the black ink abbreviation is as follows.

A(30): carbon black content 30% by mass

B(5): carbon black content 5% by mass

C(20): carbon black content 20% by mass

D(65): carbon black content 65% by mass

E(35): carbon black content 35% by mass

F(15): Carbon black content: 15% by mass

G(40): carbon black content 40% by mass

[Example 1]

Production of laminated packaging materials

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

Then, as shown in Figure 4, use a compass to draw 10 circles S (radius 85 mm) on one side of C-rPP. Each circle S is a planned line for producing a molding blank to be described later, and is drawn with a dotted line for convenience. In addition, each circle S is neatly arranged so that its center is located on the center line of the width extending in the longitudinal direction of C-rPP, and the distance between the centers is an equal interval of 90 mm.

Then, for all 10 circles S, identification marks 15 (upper base 9 mm, lower base 3 mm, height 8 mm) formed in a substantially isosceles trapezoid shape formed by printing ink A (30) are printed one point on the radius of each circle S one by one. . The center of gravity of the identification mark 15 is located 30 mm from the center of the circle S. In addition, the upper and lower bases of the identification mark 15 are parallel to one side of the C-rPP.

Here, the reason why the identification mark 15 is formed into a substantially isosceles trapezoid is as follows. That is, first, a blank punched out of a laminated packaging material having a synthetic resin film as a protective layer is molded using a deep drawing molding device to be described later. When the molded container is manufactured, the flange portion becomes annular. The portion is fixed, and the portion surrounded by the annular portion is stretched. At this time, an elongation force in the radial direction of the circle S and a compression force in the circumferential direction of the circle S are applied to the blank, so the identification mark 15 is also exerted an elongation force in the radial direction of the circle S and a compressive force in the circumferential direction of the circle S. Compression force. However, the elongation force and the compression force gradually decrease from the peripheral portion of the circle S toward the center. Therefore, the circumferential direction compression amount and the radial direction elongation amount of the identification mark 15 also increase from the portion closer to the peripheral portion of the circle S toward the center. gradually become smaller. As a result, the shape of the identification mark 15 is modified from a substantially isosceles trapezoid to a substantially square shape.

The synthetic resin film F for the protective layer is produced through the above steps.

Then, a chemical conversion treatment liquid was used to form base layers on both sides of a 120-μm-thick aluminum foil (JIS H4160: A8079-O material). The chemical conversion treatment liquid is a solution composed of phosphoric acid, polyacrylic acid, chromium (III) salt compound, water and alcohol. In addition, the coating amount is an amount such that the chromium adhesion amount becomes 10 mg/m ² per side of the aluminum alloy foil.

Then, a two-pack curable polyurethane-based adhesive whose main component is polyester polyol and whose curing agent is polyisocyanate was applied to both sides of the aluminum foil after the above treatment so that the thickness after curing becomes 3 μm. Apply to form an adhesive layer.

Then, the surface of the C-rPP printed with the identification mark 15 is bonded to the surface of the adhesive layer of one of the aluminum foils, and is bonded to the surface of the adhesive layer of the other aluminum foil as a heat-adhesive resin film. A 300 μm thick single-layer non-stretched homopolymer polypropylene film was heat-cured in a 40°C environment for 8 days to produce a laminated packaging material.

Manufacturing of formed containers

Then, the laminated packaging material was set on a deep drawing forming device (made by Amada Co., Ltd.) having a male mold and a female mold of a predetermined size. In addition, the target value of the body part height (accommodation part depth) of the molded container obtained in this molding apparatus was 30 mm. Then, using the aforementioned molding device, the laminated packaging material is punched into a circular blank with a radius of 85 mm, and at the same time, the laminated packaging material is subjected to deep drawing processing so that the protective layer becomes the outer surface side of the housing portion, thereby manufacturing the product shown in Figure 1 shaped container.

The molded container is formed in such a manner that the opening of the receiving portion is circular (diameter 50.5 mm), and an annular flange portion (width 4.5 mm) having an outer shape similar to the opening is bulged outward in the horizontal direction around the edge of the opening. In addition, the main body has an inverted cone shape (angle 6°, height 30.0mm), and the bottom is circular (diameter 44.2mm). In addition, an R portion with a curvature radius of 10 mm is formed at the boundary between the main body portion and the bottom portion.

Furthermore, on the main body side of the molded container, a substantially square identification mark 15 (target value: vertical length 10 mm, horizontal length 10 mm) formed with printing ink A (30) is visible parallel to the flange portion of the molded container. formation (refer to Figure 3).

A total of 10 shaped containers were produced using the method described above.

[Example 2]

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

Otherwise, 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. The tensile strength δ1 (MD) of C-hPP in the flow direction ( _MD) : 980 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 960 MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.02, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 46MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 47MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.98, elongation at break E _{(MD) in the flow direction (MD)} : 690%, elongation at break E (TD) in the width direction (TD ₎ : 670%, the ratio of the two E _(MD) /E _(TD) : 1.03, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : -0.6%, heating dimensional change rate CTE (TD) in the width direction ( _TD) : -0.6%, The absolute value of CTE _(MD) -CTE _(TD) : 0%, and the surface kinetic friction coefficient: 0.30. In addition, A(30) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of C-rPP in the flow direction ( _MD ) is 540 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ is 505 MPa, and the ratio between the two is δ1 _{( MD)} / δ1 _(TD) : 1.07, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 63MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 55MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 1.15, elongation at break E _{(MD) in the flow direction (MD)} : 520%, elongation at break E (TD) in the width direction (TD ₎ : 680%, the ratio of the two E _(MD) /E _(TD) : 0.76, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : -0.9%, 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 surface kinetic friction coefficient: 0.20. In addition, B(5) was used as the printing ink.

Otherwise, 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 forming a protective layer. The following synthetic resin film was obtained. The tensile strength δ1 _{(MD) of the LLDPE in the flow direction (MD)} : 500MPa, the tensile strength δ1 (TD) in the width direction ( _TD) : 550MPa, and the ratio between the two δ1 _(MD) /δ1 _(TD) : 0.91, tensile strength at break in the flow direction (MD) δ2 _(MD) : 35MPa, tensile strength at break in the width direction (TD) δ2 _(TD) : 31MPa, the ratio of the two δ2 _(MD) /δ2 _(TD) : 1.13, elongation at break E _{(MD) in the flow direction (MD)} : 680%, elongation at break E (TD) in the width direction (TD): 620 _% , the ratio of the two E _{( MD)} /E _(TD) : 1.10, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 0.8%, heating dimensional change rate CTE (TD) in the width direction (TD ₎ : 0.9%, CTE _(MD) -Absolute value of CTE _(TD) : 0.1%, surface kinetic friction coefficient: 0.40. In addition, C(20) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of HDPE in the flow direction ( _MD ) is 820 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ is 870 MPa, and the ratio between the two is δ1 _(MD). /δ1 _(TD) : 0.94, tensile strength at break in the flow direction (MD) δ2 _(MD) : 41MPa, tensile strength at break in the width direction (TD) δ2 _(TD) : 35MPa, the ratio of the two δ2 _(MD) /δ2 _(TD) : 1.17, elongation at break E _{(MD) in the flow direction (MD)} : 570%, elongation at break E (TD) in the width direction (TD): 520 _% , the ratio of the two E _{( MD)} /E _(TD) : 1.10, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 0.5%, heating dimensional change rate CTE (TD) in the width direction (TD ₎ : 0.6%, CTE _(MD) -Absolute value of CTE _(TD) : 0.1%, surface kinetic friction coefficient: 0.30. In addition, C(20) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of C-rPP in the flow direction ( _MD) : 790 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 720 MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.10, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 49MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 38MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 1.29, elongation at break E _{(MD) in the flow direction (MD)} : 620%, elongation at break E (TD) in the width direction (TD ₎ : 680%, the ratio of the two E _(MD) /E _(TD) : 0.91, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : -0.6%, heating dimensional change rate CTE (TD) in the width direction ( _TD) : -0.6%, The absolute value of CTE _(MD) -CTE _(TD) : 0%, and the surface kinetic friction coefficient: 0.20. In addition, A(30) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of C-rPP in the flow direction ( _MD) : 790 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 720 MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.10, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 49MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 48MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 1.02, elongation at break E _{(MD) in the flow direction (MD)} : 680%, elongation at break E (TD) in the width direction (TD ₎ : 680%, the ratio of the two E _(MD) /E _(TD) : 1.0, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : -0.4%, heating dimensional change rate CTE _{(TD) in the width direction (TD} ): -0.4%, The absolute value of CTE _(MD) -CTE _(TD) : 0%, and the surface kinetic friction coefficient: 0.20. Use A(30) as printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of C-hPP in the flow direction ( _MD) : 770MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 760MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.01, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 45MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 45MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 1.0, elongation at break E _{(MD) in the flow direction (MD)} : 680%, elongation at break E ₍ TD) in the width direction (TD): 700%, the ratio of the two E _(MD) /E _(TD) : 0.97, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : -0.7%, heating dimensional change rate CTE (TD) in the width direction ( _TD) : -0.7%, The absolute value of CTE _(MD) -CTE _(TD) : 0%, and the surface kinetic friction coefficient: 0.20. In addition, D(65) was used as the printing ink.

Otherwise, 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 forming a protective layer. A synthetic resin film having a tensile strength δ1 (MD) in the flow direction ( _MD ) of C-(rPP/bPP/rPP): 650 MPa and a tensile strength δ1 (TD) in the width direction ( _TD) : 680 MPa was obtained. The ratio between the two δ1 _(MD) / δ1 _(TD) : 0.96, the tensile strength at break δ2 (MD) in the flow direction ( _MD) : 50MPa, the tensile strength at break δ2 (TD) in the width direction ( _TD) : 25MPa, The ratio δ2 _(MD) /δ2 _(TD) : 2.0, the elongation at break E (MD) in the flow direction (MD ₎ : 460%, the elongation at break E (TD) in the width direction _(TD) : 510 %, the ratio E _(MD) /E _(TD) : 0.90, the heating dimensional change rate CTE (MD) in the flow direction ( _MD) : -0.4%, the heating dimensional change rate CTE (TD) in the width direction (TD _{) )} : 0.7%, the absolute value of CTE _(MD) -CTE _(TD) : 1.10%, and the surface dynamic friction coefficient: 0.20. In addition, E(35) was used as the printing ink.

Otherwise, 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 forming a protective layer. A synthetic resin film having a tensile strength δ1 (MD) in the flow direction ( _MD ) of C-(rPP/bPP/rPP): 720 MPa and a tensile strength δ1 (TD) in the width direction ( _TD) : 760 MPa was obtained. The ratio between the two δ1 _(MD) / δ1 _(TD) : 0.95, the tensile strength at break δ2 (MD) in the flow direction ( _MD) : 48MPa, the tensile strength at break δ2 (TD) in the width direction _(TD) : 47MPa, The ratio between the two δ2 _(MD) / δ2 _(TD) : 1.02, the elongation at break E (MD) in the flow direction ( _MD) : 720%, the elongation at break E (TD) in the width direction ( _TD) : 760 %, the ratio E _(MD) /E _(TD) : 0.95, the heating dimensional change rate CTE (MD) in the flow direction ( _MD) : -0.6%, the heating dimensional change rate CTE (TD) in the width direction (TD _{) )} : -0.5%, absolute value of CTE _(MD) -CTE _(TD) : 0.10%, surface dynamic friction coefficient: 0.20. In addition, F (15) was used as the printing ink.

Otherwise, 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 forming a protective layer. A synthetic resin film having a tensile strength δ1 _{(MD) in the flow direction (MD} ) of O-Ny: 2500MPa, a tensile strength δ1 (TD) in the width direction ( _TD) : 2300MPa, and a ratio δ1 _{( MD)} /δ1 _(TD) : 1.09, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 240MPa, tensile strength at break δ2 (TD) in the width direction (TD ₎ : 270MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.89, elongation at break E (MD) in the flow direction ( _MD) : 100%, elongation at break E (TD) in the width direction (TD ₎ : 100%, the ratio of the two E _(MD) /E _(TD) : 1.00, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 1.7%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : 0.6%, CTE _{( MD)} -CTE _(TD) absolute value: 1.10%, surface kinetic friction coefficient: 0.25. In addition, A(30) was used as the printing ink.

Otherwise, 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 forming a protective layer. The tensile strength δ1 (MD) of C-PET in the flow direction ( _MD) : 2100MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 2120MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 0.99, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 260MPa, tensile strength at break δ2 (TD) in the width direction (TD ₎ : 265MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.98, elongation at break E _{(MD) in the flow direction (MD)} : 150%, elongation at break E (TD) in the width direction (TD ₎ : 130%, the ratio of the two E _(MD) /E _(TD) : 1.15, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 1.2%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : 0.2%, CTE _{( MD)} -CTE _(TD) absolute value: 1.00%, surface kinetic friction coefficient: 0.50. In addition, G(40) was used as the printing ink.

Otherwise, 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. The following synthetic resin film was obtained. The tensile strength δ1 (MD) of this O-PBT in the flow direction ( _MD) : 1540MPa, the tensile strength δ1 (TD) in the width direction ( _TD) : 1530MPa, and the ratio δ1 _{( MD)} /δ1 _(TD) : 1.01, tensile strength at break in the flow direction (MD) δ2 _(MD) : 80MPa, tensile strength at break in the width direction (TD) δ2 _(TD) : 78MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 1.03, elongation at break E _{(MD) in the flow direction (MD)} : 390%, elongation at break E (TD) in the width direction (TD ₎ : 400%, the ratio of the two E _(MD) /E _(TD) : 0.98, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 0.2%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : -0.1%, CTE _(MD) -CTE _(TD) absolute value: 0.30%, surface kinetic friction coefficient: 0.30. In addition, A(30) was used as the printing ink.

Otherwise, 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 forming a protective layer. The following synthetic resin film was obtained. The tensile strength δ1 _{(MD) of the LLDPE in the flow direction (MD)} : 240MPa, the tensile strength δ1 (TD) in the width direction ( _TD) : 300MPa, and the ratio of the two δ1 _(MD) /δ1 _(TD) : 0.80, tensile strength at break in the flow direction (MD) δ2 _(MD) : 33MPa, tensile strength at break in the width direction (TD) δ2 _(TD) : 27MPa, the ratio of the two δ2 _(MD) /δ2 _(TD) : 1.22, elongation at break E _{(MD) in the flow direction (MD)} : 660%, elongation at break E (TD) in the width direction (TD ₎ : 800%, the ratio of the two E _{( MD)} /E _(TD) : 0.83, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 0.6%, heating dimensional change rate CTE (TD) in the width direction (TD ₎ : 0.8%, CTE _(MD) -Absolute value of CTE _(TD) : 0.2%, surface kinetic friction coefficient: 0.40. In addition, A(30) was used as the printing ink.

Otherwise, 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 forming a protective layer. The tensile strength δ1 (MD) of the O-Ny flow direction ( _MD) : 2600MPa, the tensile strength δ1 (TD) of the width direction (TD ₎ : 2100MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.24, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 250MPa, tensile strength at break δ2 (TD) in the width direction (TD ₎ : 290MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.86, elongation at break E _{(MD) in the flow direction (MD)} : 120%, elongation at break E (TD) in the width direction (TD ₎ : 100%, the ratio of the two E _(MD) /E _(TD) : 1.20, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 2.2%, heating dimensional change rate CTE (TD) in the width direction ( _TD) : 2.5%, CTE _{( MD)} -CTE _(TD) absolute value: 0.30%, surface kinetic friction coefficient: 0.10. In addition, A(30) was used as the printing ink.

Otherwise, 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. The resulting synthetic resin film has a tensile strength δ1 _{(MD) of O-PET in the flow direction (MD)} : 3750MPa, a tensile strength δ1 (TD) in the width direction ( _TD) : 3880MPa, and a ratio δ1 _{( MD)} /δ1 _(TD) : 0.97, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 220MPa, tensile strength at break δ2 (TD) in the width direction (TD ₎ : 230MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.96, elongation at break E (MD) in the flow direction ( _MD) : 90%, elongation at break E _{(TD) in the width direction (TD)} : 85%, the ratio of the two E _(MD) /E _(TD) : 1.06, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 1.2%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : 1.3%, CTE _{( MD)} -CTE _(TD) absolute value: 0.10%, surface kinetic friction coefficient: 0.60. In addition, A(30) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 (MD) of HDPE in the flow direction (MD ₎ is 1050 MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ is 1400 MPa, and the ratio between the two is δ1 _(MD). /δ1 _(TD) : 0.75, tensile strength at break in the flow direction (MD) δ2 _(MD) : 40MPa, tensile strength at break in the width direction (TD) δ2 _(TD) : 33MPa, the ratio of the two δ2 _(MD) /δ2 _(TD) : 1.21, elongation at break E _{(MD) in the flow direction (MD)} : 580%, elongation at break E (TD) in the width direction (TD ₎ : 350%, the ratio of the two E _{( MD)} /E _(TD) : 1.66, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 0.5%, heating dimensional change rate CTE (TD) in the width direction (TD ₎ : 0.5%, CTE _(MD) -Absolute value of CTE _(TD) : 0%, surface kinetic friction coefficient: 0.25. In addition, A(30) was used as the printing ink.

Otherwise, 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. The tensile strength δ1 _{(MD) of this O-rPP in the flow direction (MD)} : 2000MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 4000MPa, and the ratio δ1 _{( MD)} /δ1 _(TD) : 0.50, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 150MPa, tensile strength at break δ2 (TD) in the width direction _(TD) : 350MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.43, elongation at break E _{(MD) in the flow direction (MD)} : 200%, elongation at break E (TD) in the width direction (TD ₎ : 50%, the ratio of the two E _(MD) /E _(TD) : 4.00, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 3.0%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : 1.0%, CTE _{( MD)} -CTE _(TD) absolute value: 2.0%, surface kinetic friction coefficient: 0.40. In addition, A(30) was used as the printing ink.

Otherwise, 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 forming a protective layer. The tensile strength δ1 _{(MD) of this O-PBT in the flow direction (MD)} : 3000MPa, the tensile strength δ1 (TD) in the width direction (TD ₎ : 2900MPa, and the ratio δ1 _{( MD)} / δ1 _(TD) : 1.03, tensile strength at break δ2 _{(MD) in the flow direction (MD)} : 210MPa, tensile strength at break δ2 (TD) in the width direction (TD ₎ : 220MPa, the ratio between the two δ2 _{( MD)} /δ2 _(TD) : 0.95, elongation at break E _{(MD) in the flow direction (MD)} : 150%, elongation at break E (TD) in the width direction (TD ₎ : 150%, the ratio of the two E _(MD) /E _(TD) : 1.00, heating dimensional change rate CTE _{(MD) in the flow direction (MD)} : 2.1%, heating dimensional change rate CTE _{(TD) in the width direction (TD)} : 0.2%, CTE _{( MD)} -CTE _(TD) absolute value: 1.90%, surface kinetic friction coefficient: 0.30. In addition, A(30) was used as the printing ink.

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

In the above-described Examples 1 to 14 and Comparative Examples 1 to 6, the tensile strength, tensile strength at break, and elongation at break are actual measured values based on JIS K7161. In addition, the heating dimensional change rate is based on JIS K7133, and the original size is set to 120 mm in the flow direction (MD) and the width direction (TD) is 120 mm. The actual measured value is under heating conditions of 90°C and 30 minutes. The dynamic friction coefficient is based on the actual measured value of JIS K7125.

The physical properties of the synthetic resin films used in the above-mentioned Examples 1 to 14 and the types of printing inks used in the printing of identification marks are summarized in Table 1. The physical properties of the synthetic resin films used in the above-mentioned Comparative Examples 1 to 6 and the printing of the identification marks are summarized in Table 1. The types of printing inks used are summarized in Table 2.

[Table 1]

[Table 2]

[Evaluation of molded containers]

(identification mark dimensional stability)

For the identification marks 15 displayed on the main bodies of 10 molded containers in each of Examples 1 to 14 and Comparative Examples 1 to 6, (i) the average sum of the vertical and horizontal dimensions, (ii) The difference between the vertical and horizontal dimensions (maximum value - minimum value), (iii) the respective standard deviations of the vertical and horizontal dimensions, based on (ii) the difference between the vertical and horizontal dimensions (maximum value - minimum value) and (iii) The standard deviation is used to evaluate the dimensional stability of the identification mark. These results are shown in Table 3. In the evaluation results in Table 3, a standard deviation of less than 0.010 is represented by ◎, a standard deviation of 0.010 or more and less than 0.030 is represented by ○, and a standard deviation of 0.030 or more is represented by ×. ◎ and ○ are qualified products.

(Identification mark printability)

The appearance of the identification mark (a substantially square-shaped mark) displayed on the main body of each molded container was observed to evaluate the printability. As a result, in the molded containers of Examples 4 and 9, depending on the amount of carbon black contained in the printing ink, the roughly square mark as the identification mark was slightly blurred or unclear, but as a product so far as there is no impact. No abnormality was observed in any of the molded containers of other examples and comparative examples.

(Container formability)

The heights of the main bodies of 10 molded containers in each of Examples 1 to 14 and Comparative Examples 1 to 6 were measured and the average value of the main body heights was obtained, and the container moldability was evaluated based on the average value of the main body heights. These results are shown in Table 3. In the evaluation results in Table 3, ◎ indicates that the average value of the main body height is 30 mm or more as the target value and no delamination occurs at the flange part. The average value of the main body height is less than 30 mm as the target value and is 26 mm. The above and the delamination does not occur in the flange part are indicated as ○, and the average height of the main body part is less than 26 mm and delamination occurs in the flange part, and it is indicated as ×. ◎ and ○ are qualified products.

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

[table 3]

The dimensional stability of the identification marks of the molded containers of Examples 1 to 14 were 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 have excellent identification mark dimensional stability.

In the molded containers of Examples 4 and 9, depending on the amount of carbon black contained in the printing ink, the roughly square mark used as an identification mark was slightly blurred or unclear, but as a product, there was no within the scope of influence. No abnormality was observed in any of the molded containers of other examples and comparative examples.

The height of the main body part of the molded containers of Examples 1 to 11 was all 30 mm or more, and they could be molded to the extent that the internal content could be fully ensured. Therefore, it was determined that the container molding was also good. Although the height of the main body of the molded containers of Examples 12 to 14 was less than 30 mm, it was 26 mm or more. Therefore, it was judged that there was no practical problem as a product.

From the above results, it can be seen that the molded containers of all the examples that satisfied the condition 1) above showed good results in terms of identification mark dimensional stability, identification mark printability, and container moldability without affecting the product. Furthermore, in the molded containers of Example 3, Example 8, Example 9, and Example 11 that satisfied all the conditions 1) to 4) above, all of them had excellent identification mark dimensional stability, identification mark printability, and container moldability. Shows excellent results.

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

Claims (8)

1. A molded container comprising a container portion formed by a main body portion and a bottom portion surrounded by a lower end portion periphery of the main body portion and having an upper opening for containing a content, wherein the molded container is formed by subjecting a laminated packaging material comprising a barrier layer formed of a metal foil, a sealing layer covering one surface of the barrier layer, and a protective layer formed of a synthetic resin film and covering the other surface of the barrier layer to press working so that the protective layer faces the outer sides of the main body portion and the bottom portion of the container portion,

Tensile strength δ1 of the synthetic resin film serving as the protective layer of the laminated packaging material in the flow direction MD _MD Tensile strength δ1 in the widthwise direction TD _TD Are 500MPa to 2500MPa and delta 1 _MD And delta 1 _TD Ratio delta 1 _MD /δ1 _TD On at least the surface of the synthetic resin film facing the barrier layer side, a recognition mark formed of at least any one of characters, figures, symbols, and patterns is formed by a printing ink so as to be visible from the surface of the synthetic resin film facing the other side, and the recognition mark is displayed so as to be visible from the outside on at least one of the main body portion and the bottom portion of the housing portion.

2. The molded container according to claim 1, wherein the synthetic resin film has a tensile strength at break δ2 in a flow direction MD thereof _MD Tensile strength at break δ2 in the widthwise direction TD _TD Are all 30MPa to 70MPa and delta 2 _MD And delta 2 _TD Ratio delta 2 _MD /δ2 _TD 0.9 to 1.1.

3. The molded container according to claim 1, wherein the synthetic resin film has an elongation at break E in a flow direction MD _MD Elongation at break E in width direction TD _TD 500% -900% and E _MD And E is connected with _TD Ratio E of _MD /E _TD 0.8 to 1.2.

4. The molded container according to claim 1, wherein the synthetic resin film has a heat dimensional change rate CTE in a flow direction MD _MD At 90 ℃ and 30 minutes, is-2.0 to 1.5%, and has a heating dimensional change rate CTE in the width direction TD _TD Under the same measurement conditions, is-1.5 to 1.5 percent and has CTE _MD And CTE of _TD Difference CTE of _MD -CTE _TD The absolute value of (2) is 1.5% or less.

5. The molded container according to claim 1, wherein identification marks are formed only on one of the two surfaces of the synthetic resin film, and the dynamic friction coefficient of the other surface on which the same identification marks are not formed is 0.1 to 0.5.

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

7. The molded container according to claim 1, wherein an adhesive layer is interposed between the barrier layer and the protective layer.

8. A package comprising a molded container and a lid, wherein a content is contained in a container portion of the molded container, and the lid covers an opening of the container portion of the molded container and is heat-sealed to an upper end of a main body portion of the container portion, wherein the molded container is formed of the molded container according to any one of claims 1 to 7.