JPH061381A - Container lid - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Heated by the steam supplied in the container,
The half-open container lid can automatically seal the container. [Structure] A lid 1 comprising a laminated sheet 6 of a base material layer 2, an adhesive layer 3, a metal layer 4, and a heat-sealable resin layer 5, which is used for sealing a container, and the lid 1 is the heat seal. In the lid 1 in which the direction of peeling off the lid 1 from the container when it is heat-sealed via the resin layer 6 is indicated by printing on the surface of the lid 1, the base material layer 2 is placed inside. Formed by a single layer of the stretched resin film 2a having a large number of fine voids 8 or a layer composed of a laminated sheet 6 containing the stretched resin film 2a having a large number of fine voids 8 inside, the printed peeling direction is The base layer 2 of the lid 1 is provided so as to match the direction in which the coefficient of thermal expansion is large when the temperature is raised from 30 ° C. to 80 ° C. over 5 minutes at a heating rate of 10 ° C./min. 1. A lid 1 for a container, which is characterized in that

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a heat-sealing of a container for instant food such as instant cup noodles, cup sushi, cup soup, and cup miso soup, which is eaten after pouring hot water into the container and holding it for a certain period of time. Regarding the lid used.

[0002]

2. Description of the Related Art Conventionally, instant foods represented by instant cup noodles can be eaten simply by pouring hot water into a container and waiting for a few minutes (1 to 5 minutes). It is eaten in large quantities by singles, factory night workers, single employees, students, and others. In order to eat such an instant food, for example, the case of instant cup noodles will be specifically described. First, the transparent shrink wrapping film packaged at the time of purchase is removed, and then the container is heat-sealed ( The pulling part of the heat-sealed lid is picked up by fingers and pulled up, and about 1/3 to 1/2 of the lid is peeled off from the container.
Then, the bag containing the ingredients and soup other than the noodles in the container is cut with fingers, placed on the noodles, and boiling water is poured into this. After pouring hot water, the part of the peeled lid is placed on the flange portion at the upper end of the container to close the lid, and a weight is placed on the lid so that the lid does not roll up and open, or The heat in the container is prevented from escaping by using tape or the like to improve the heat efficiency, and the contents are steamed. And
After a lapse of a predetermined time (1 to 5 minutes), the weight on the lid is removed, the rolled-up lid is pulled, the lid is completely peeled off from the container, and the contents are steamed. Can eat.

As a container used for such instant foods, polystyrene paper, a high-impact polystyrene sheet, or a laminated sheet of nylon and polyethylene, which have a good heat retaining property, is usually cup-assisted by plug-assist vacuum forming or pressure forming. A molded product, a foam polystyrene cup obtained by in-mold bead foam molding, a container obtained by injection molding polypropylene, and the like are used. Further, as the lid used for the above-mentioned container, as shown in FIG. 4, a high-quality paper having a print 14 on its surface is used as the base material layer 2, and a low density polyethylene, an ethylene / acrylic acid copolymer An adhesive layer 3 formed by extrusion coating a molten resin film, or an adhesive layer 3 coated with a urethane-based or polyester-based liquid adhesive (so-called anchor coating agent), and an aluminum foil having a wall thickness of 6 to 15 μm were attached to the adhesive layer 3. Aluminum foil layer 4, and further heat-sealing layer 5 formed by extrusion-laminating low-density polyethylene or a low melting point (80-135 ° C.) resin of ethylene / vinyl acetate copolymer on the aluminum foil layer or dissolving it in a solvent and coating it. Which is a laminated sheet 6 having a four-layer structure with heat sealability
Was used.

[0004]

However, such a lid of an instant food container has such a feature that when the lid of the container is partially opened and hot water is poured, the steam of the hot water passes through the aluminum layer on the inside of the lid to form a base material. As a result of heating the high-quality paper and releasing the water content in the high-quality paper, the high-quality paper contracts, the lid curls upward, and warps back (see FIG. 5). Therefore, the lid of an instant food container cooked with this kind of hot water conventionally requires the trouble of pouring hot water and then closing the lid of the opened lid by weighting the lid. It was

[0005]

[Means for Solving the Problems]

[Summary of the Invention] The inventors of the present invention have conducted extensive studies in view of the above problems, and as a result, can thermally expand outside the metal foil more greatly than the metal foil due to the temperature of steam, and the thermal expansion thereof Assuming that the lid is not so large that it curls inward, the lid of the container is automatically closed by using a stretched resin film with a specific structure and physical properties. The present invention has been completed based on the knowledge that the above can be achieved. That is, the lid of the container of the present invention comprises a laminated sheet of a base material layer / adhesive layer / metal layer / heat-sealable resin layer, and is a lid used for sealing the container, and the lid is the heat-sealable one. In the lid in which the direction of peeling the lid from the container is indicated by printing on the surface of the lid when heat-sealed to the container through the resin layer, the base material layer has many fine voids inside. A stretched resin film having a single layer or a layer made of a laminated sheet containing a stretched resin film having a large number of fine voids therein, and the printed peeling direction is the temperature rise of the base material layer of the lid portion. It is characterized in that it is provided so as to match the direction in which the coefficient of thermal expansion is large when the temperature is raised from 30 ° C. to 80 ° C. over 5 minutes at a speed of 10 ° C./min.

[Detailed Description of the Invention] [I] Container Lid (1) Structure As shown in FIG. 1, the container lid 1 of the present invention basically has the following base material layer 2 / adhesive layer. 3 / Metal layer 4 / Heat-sealing resin layer 5 is included in the laminated sheet 6. (a) Base Material Layer As the base material layer 2 used in the lid 1 of the container of the present invention, as shown in FIG. 1, a thermoplastic resin film 2a containing an inorganic fine powder 7 is used at a temperature lower than the melting point of the resin. It is a stretched resin film 2a having a large number of fine voids 8 inside the film obtained by stretching, or a laminated film 2 in which the stretched resin film 2a and other resin films 2b and 2c are laminated. Such a base material layer 2 is specifically a biaxially stretched resin microporous film 2 containing an inorganic fine powder 7.
a, a uniaxially stretched resin microporous film 2b, 2c containing the biaxially stretched resin film as a core layer and containing the inorganic fine powder 7 on one or both surfaces (Japanese Patent Publication Nos. 46-40794 and 63-1183). An example is a stretched resin film 2 (see FIG. 1) having a multilayer structure in which is laminated. Needless to say, a resin film containing no inorganic fine powder 7 may be laminated as long as the self-closing property of the lid 1 of the container of the present invention is not impaired. For example, in order to impart high gloss to the print, the surface side of the base material layer 2 to be printed does not substantially contain the inorganic fine powder 7 having a thickness of 0.2 to 8 μm (0 to 0). 3 wt%) resin film layer can be formed.

Inorganic fine powder As the above inorganic fine powder, calcined clay, calcium carbonate, diatomaceous earth, titanium oxide, palm curite, talc, etc. can be mentioned, and the inorganic fine powder generally has a particle size of 0.03 to 0.03. Those having a thickness of 15 μm, preferably 0.1 to 5 μm are used.

Thermoplastic Resin As the thermoplastic resin, polypropylene, polyethylene, ethylene / propylene copolymer, ethylene / buden-1 copolymer, ethylene / 4-methylpentene-1 copolymer, propylene / ethylene / buden -1 copolymer,
Examples thereof include polystyrene, polyethylene terephthalate, nylon-6, nylon-6,6, nylon-6,10 and nylon-6,12.

[0009] Thermoplastic resin films containing an extended elongation above inorganic fine powder is stretched at a temperature lower than the melting point of the resin. The stretching ratio at this time is 1.3 to 15 times, preferably 3.5 to 10 times in one direction or two directions, respectively. The number of stretching axes is uniaxial or biaxial.

Physical Properties <Void> In the container lid of the present invention, the stretched resin film used for the base material layer 2 has a large number of fine voids (porosity) 8 with the inorganic fine powder 7 as the core. Such a stretched resin film has a porosity of 4 to 60 calculated by the following formula.
%, Preferably 8 to 50%. Porosity = [(ρ ₀ −ρ) / ρ ₀ ] × 100 ρ ₀ : Density of film before stretching ρ: Density of film after stretching

<Coefficient of Thermal Expansion> In the lid of the container of the present invention, the coefficient of thermal expansion (L _e ) of the base material layer is important. The coefficient of thermal expansion of such a base material layer was tested using a thermomechanical analyzer “TM-7000” (trade name) manufactured by Vacuum Riko Co., Ltd., with a width of 5 mm and a span length of 30 mm (L ₀ ). Temperature rising rate of 10 ℃
The temperature was increased from 30 ° C. to 80 ° C. over 5 minutes at a speed of 5 minutes, and the span length (L) of the test piece at the temperature of 80 ° C. was measured. TMA method) is shown. Thermal expansion coefficient = [(L−L ₀ ) / L ₀ ] × 100 The value of this thermal expansion coefficient is 0.40 to 1.0%, preferably 0.55 to 0.85%. The value of this coefficient of thermal expansion is 1.
If it exceeds 0%, as shown in FIG. 6, the self-closing property of the lid 1 after pouring hot water into the container 9 is too fast, and the contents have not been steamed (the cup noodles are ready to be eaten). The tip part 1a of the lid that closed itself too much before was caught inside too much,
A gap 10 is created between the container 9 and the lid 1. Also,
When the value of the coefficient of thermal expansion is less than 0.40%, the time required for self-closing is too slow (takes 90 seconds to 3 minutes), which causes irritation to the eater. The value of the coefficient of thermal expansion of the substrate layer obtained by the TMA method is a value obtained by subtracting the coefficient of thermal contraction of the stretched resin film from the coefficient of thermal expansion of the material resin of the stretched resin film.

<Tensile Elastic Modulus> The tensile elastic modulus (JIS-K7113) of the base material layer in the peeling direction α displayed by the peeling direction display portion 11 of the base material layer is 10,000.
~ 45,000 kg / cm ² , preferably 15,000
˜30,000 kg / cm ² . Since the orientation of the base layer is exerted on the film by stretching, the elastic modulus shows a value higher than that of the unstretched resin film. Therefore, the thickness of the base material layer can be reduced. Lid thickness of the base material layer used in the container wall thickness invention generally 15～180Myuemu, preferably 40 to 100 [mu] m.

(B) Adhesive Layer The adhesive layer laminated in the lid of the container of the present invention for laminating the base material layer and a metal layer such as an aluminum foil described later includes urethane prepolymer, liquid polyester, Isocyanate-based, polyester isocyanate-based, polyether isocyanate-based, polyethyleneimine-based, organic titanate-based anchor coating agents, low-density polyethylene, ethylene / vinyl acetate copolymers, ethylene / acrylic acid copolymers and other hot melt adhesives Can be mentioned. 1-20g / m for coating type adhesive
² , preferably used in an amount of ^{2 to} 6 g / m ² . Hot melt adhesive is melt extrusion laminated, 8-30μ
Used with a thickness of m. Such an adhesive layer is typically 1
It is used in a thickness of -30 μm, preferably 2-15 μm.

(C) Metal Layer As the metal layer used in the lid of the container of the present invention,
A metal foil such as an aluminum foil or an iron foil having a wall thickness of usually 3 to 25 μm can be mentioned. Especially the wall thickness is 6 ~ 15μ
It is preferable to use an aluminum foil of m for the reasons of handling and economical reasons. Further, from the economical aspect, the metal foil is usually used with a thickness smaller than that of the base material layer.

(D) Heat-sealable resin layer As the heat-sealable resin used for heat-sealing the container and the lid in the present invention, a resin having a melting point lower than that of the resin constituting the base material layer is used. . Specific examples of such heat-sealable resin include low-density polyethylene,
Linear low density polyethylene, ethylene / vinyl acetate copolymer (preferably ethylene / vinyl acetate copolymer having a vinyl acetate content of 12% by weight or less), ethylene / acrylic acid copolymer (preferably ethylene content of 65-94) Wt% ethylene / acrylic acid copolymer), ethylene / methacrylic acid alkyl ester copolymer, ionomer (metal salt of ethylene / acrylic acid copolymer, metal salt of ethylene / methacrylic acid copolymer), ethylene / propylene Examples thereof include copolymers, ethylene / propylene / butene-1 copolymers and vinyl chloride / vinyl acetate copolymers. The heat-sealable resin may be extrusion-laminated on a metal sheet such as an aluminum foil, or the resin may be dissolved in a solvent, coated on the aluminum foil using a coater, and dried to obtain a heat-sealable resin. Layers may be provided. The heat-sealable resin layer has a thickness of 2 to
It is 50 μm, preferably 3 to 40 μm. The heat-sealing of the container and the lid using such a heat-sealable resin can prolong the shelf life of the food in the container.

(2) Peeling direction display section In the container lid 1 of the present invention, as shown in FIG.
In order to peel off the lid 1, it is important in the present invention that the peeling direction indicator 11 is displayed by printing the peeling direction α. The peeling direction α indicated by the peeling direction display portion 11 of the lid 1 can promote the self-closing property of the lid 1 when hot water is supplied into the container 9, and thus the peeling direction display portion 11 The peeling direction α is defined as the direction β in which the coefficient of thermal expansion of the base material layer 2 is large.
It is desirable to print in conformity with. When the instruction of the peeling direction α by printing the peeling direction display portion 11 of the lid 1 is printed in the direction γ having a small coefficient of thermal expansion, the lid 1 peeled in the direction γ is self-closing. Is reduced.

(3) Thickness The thickness of the lid 1 made of the laminated sheet 6 is generally 40 to 2
00 μm, economically 60 to 150 μm.

[II] Manufacture of container with lid (1) Heat sealing Basically, base material layer 2 / adhesive layer 3 / metal layer 4 / heat sealability, which becomes the lid 1 of the container of the present invention formed as described above. A laminated sheet 6 composed of the resin layer 5 is provided inside the dried noodles 12 and the ingredients 13
It is placed on a container 9 in which is put and heat-sealed at a temperature of usually 100 to 160 ° C., preferably 120 to 140 ° C. for 0.1 to 3 seconds. (2) Formation of pulling part The container 9 heat-sealed to the laminated sheet 6 is a separate container 9
The lid 1 having a circular shape (for example, a diameter of 150 mm) larger than the edge portion of the container is trimmed so that the lid 1 can be separated and peeled off. (3) Shrink wrap Next, the sealed container thus obtained is shrink-wrapped to form a product.

[III] Hot Water Supply The lid 1 that has been half opened is heated by the steam that has been supplied, and the base material layer 2 is subjected to the thermal expansion of the metal layer 4 of the material forming the lid 1.
The thermal expansion is superior, and the bimetal effect allows the lid 1 to automatically return to the original position (see FIG. 2) to seal the container 9.

[0020]

【Example】

Example 1 Production of base material layer (1) 81% by weight of polypropylene having a melt index (MI) of 0.8 (melting point of about 164-167 ° C.), 3% by weight of high-density polyethylene and calcium carbonate having an average particle size of 1.5 μm The composition (A) containing 16% by weight is mixed at 270 ° C.
After kneading with the extruder set to, the sheet was extruded and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 150 ° C. and then stretched 5 times in the machine direction. (2) Polypropylene with MI of 0.4 (melting point about 164-1)
(67 ° C.) 54% by weight and 46% by weight of calcium carbonate having an average particle size of 1.5 μm were mixed and kneaded in another extruder, and then extruded into a sheet from a die. Was laminated on both sides of the 5-fold stretched film of (1) to obtain a laminated film having a three-layer structure. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is again cooled to about 175 ° C.
Heat up to the temperature of 7. and use a tenter to move laterally 7.
Stretched 5 times, annealed at a temperature of 165 ° C,
Cooled to a temperature of 60 ° C, slit the ears and have a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching), wall thickness 80 μm
A base material layer (B / A / B = 20 μm / 40 μm / 20 μm) was obtained. The void ratio of each layer is (B / A / B =
It was 4.6% / 13.9% / 4.6%). Manufacture of Lid The surface of the base material layer was printed, and a urethane prepolymer anchor coating agent was applied to the back surface side so as to be 3 g / m ^2, and an aluminum foil having a thickness of 6 μm was laminated on this. . On the aluminum foil side of this laminate, an ethylene / vinyl acetate copolymer (vinyl acetate content 5.4% by weight) was extruded at 200 ° C. (thickness: 22%).
μm) and then cooled. This was trimmed to obtain a substantially circular lid (diameter 150 mm). The printing such as the arrow indicating the peeling direction of the surface of the lid was matched with the sheet feeding direction (MD direction). 250 g of dried noodles and 25 g of ingredients were put in a container made of expanded polystyrene having a heat seal content of 1,000 cc and a diameter of about 150 mm, and the lid was heat-sealed by applying pressure at 140 ° C. for 0.5 seconds. Evaluation After standing for one day, pull the lid with your finger in the direction of the arrow of the peeling portion printed on the lid of the expanded polystyrene container to open 2/3 of the lid, and boil from this opening. 600 cc of hot water (temperature of about 91 ° C.) was poured into the container for 5 seconds to measure the self-closing property of the lid. The results obtained are shown in Table 1.

Example 2 The procedure of Example 1 was repeated except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) Composition (A) in which 81% by weight of polypropylene having a melt index (MI) of 0.8% by weight is mixed with 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle size of 1.5 μm. Was kneaded with an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device,
An unstretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) Composition (B) in which 54% by weight of polypropylene having MI of 0.4 and 46% by weight of calcium carbonate having an average particle size of 1.5 μm are mixed with 81% by weight of polypropylene having MI of 4.0 and high density. Polyethylene 3% by weight and average particle size 1.5
The composition (C) mixed with 16% by weight of calcium carbonate of μm is melt-kneaded in another extruder, and then melt-extruded into a sheet form from a die, and this is stretched 5 times as much as (1). By laminating on both sides of the film, a laminated film having a three-layer structure was obtained. Next, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C. and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A / C = 16 μm).
/ 48 μm / 16 μm) was obtained. The void ratio of each layer is (B / A / C = 30% / 29.7% / 3.
It was 0%). The printing surface was applied to the surface of layer B.

Example 3 The procedure of Example 1 was repeated except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Manufacture of base material layer (1) Polypropylene having MI of 2 g / 10 min (melting point of about 1
64 ° C) 77% by weight, high-density polyethylene 10% by weight,
A resin composition containing 10% by weight of calcium carbonate having an average particle diameter of 1.5 μm and 3% by weight of titanium oxide was melt-kneaded by an extruder and extruded into a sheet at a temperature of 200 ° C., which was cooled by a cooling device. After that, reattach the sheet 15
After heating to a temperature of 0 ° C., it was stretched 5 times in the machine direction to obtain a stretched film. Then, after heating again to a temperature of 158 ° C., it is stretched 7 times in the transverse direction, annealed at a temperature of 164 ° C., cooled to a temperature of 60 ° C., and the ears are slit to reduce the wall thickness. A 50 μm monolayer biaxially oriented film was obtained. The void ratio of this monolayer structure biaxially stretched film was 44.7%.

Comparative Example 1 The procedure of Example 1 was repeated except that the base material layer was manufactured as follows. The results obtained are shown in Table 1. Production of base material layer (1) Composition (A) in which 81% by weight of polypropylene having a melt index (MI) of 0.8% by weight is mixed with 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle size of 1.5 μm. Was kneaded with an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device,
An unstretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) A composition (B) in which 54% by weight of polypropylene having an MI of 4.0 and 46% by weight of calcium carbonate having an average particle size of 1.5 μm are mixed and kneaded in another extruder, It was extruded into a sheet and laminated on both sides of the 5 times stretched film of (1) to obtain a laminated film having a three-layer structure.
Next, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C., the ears are slit and a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching) with a wall thickness of 80 μm (B / A / B = 16 μm / 48
A base layer of (μm / 16 μm) was obtained. The void ratio of each layer was (B / A / B = 30% / 33.7% / 30%).

Comparative Example 2 The procedure of Example 1 was repeated except that the substrate layer was manufactured as follows. The results obtained are shown in Table 1. Manufacture of base layer Synthetic paper "Yupo FPG #" made by Oji Yuka Synthetic Paper Co., Ltd., which is made of multi-layer stretched polypropylene film containing inorganic fine powder
80 "(trade name, wall thickness 80 μm) was used. (Void ratio of base material layer 33%)

Comparative Example 3 The procedure of Example 1 was repeated except that the base material layer was manufactured as follows. The results obtained are shown in Table 1. Production of Base Layer A transparent unstretched polypropylene film “Taiko FHK2” (trade name, wall thickness 60 μm) manufactured by Nimura Sansho Co., Ltd. was used. (Void ratio of base material 0%)

Comparative Example 4 The procedure of Example 1 was repeated except that the base material layer was manufactured as follows. The results obtained are shown in Table 1. Production of base material layer Paper for base material of commercially available cup ramen lid ("Cormorant" (trade name) of Fuji Kako Co., Ltd. (wall thickness 90 μm,
A weighed amount of 82.4 g / m ² )) was used.

Example 4 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) 81% by weight of polypropylene having a melt index (MI) of 0.8 (melting point of 164 ° C.), 3% by weight of high-density polyethylene and calcium carbonate having an average particle size of 1.5 μm 1
The composition (A) containing 6% by weight was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) A composition (B) in which 54% by weight of polypropylene having an MI of 4.0 and 46% by weight of calcium carbonate having an average particle size of 1.5 μm are mixed and kneaded with another extruder, It was extruded in a sheet form from a die and laminated on one side of the 5-fold stretched film of (1) to obtain a laminated film having a two-layer structure. Then, this composition (B) and polypropylene (C) having MI of 4.0 are melt-kneaded in another extruder and then laminated in two layers in a die. The laminated film having the four-layer structure was obtained by laminating the composition (B) on the side of the laminated film having the two-layer structure, on which the sheet layer was not laminated, so that the polypropylene (C) was on the outside. Then, the laminated film having the four-layer structure is cooled to 60 ° C., heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, cool to a temperature of 60 ° C. and slit the ears (C / B / A / B = 5 μm / 16 μm / 4
A base material layer having a four-layer structure of 8 μm / 11 μm) was obtained. The void ratio of each layer is (C / B / A / B = 0% / 45% / 16%
/ 45%). The printing surface was applied to the surface of the C layer.

Example 5 Production of Substrate Layer (1) 81% by weight of polypropylene having a melt index (MI) of 0.8 (melting point 164 ° C.), 3% by weight of high-density polyethylene and calcium carbonate having an average particle size of 1.5 μm 1
The composition (A) containing 6% by weight was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 150 ° C. and then stretched 5 times in the machine direction. (2) Separately, a composition (B) in which 55% by weight of polypropylene having an MI of 4.0, 45% by weight of calcium carbonate having an average particle size of 1.5 μm and a polypropylene (C) having an MI of 4.0 are separated. After melt-kneading with an extruder, this was extruded into a sheet form from a die and laminated on both sides of the (1) 5-fold stretched film to obtain a laminated film having a three-layer structure. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 175 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C., and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A / C = 20 μm / 40 μm).
m / 20 μm) was obtained. The void ratio of each layer was (B / A / C = 5.2% / 14.2% / 0%). The printing is performed on the B layer side. Manufacture of lid: The surface of the above-mentioned base material layer is printed, and further, an anchor coating agent of urethane prepolymer is applied to the back surface side so as to be 3 g / m ^2, and an aluminum foil having a thickness of 6 μm is dry laminated on this. did. An ethylene / vinyl acetate copolymer (vinyl acetate content 5.4% by weight) was extrusion laminated (wall thickness: 22 μm) at a temperature of 200 ° C. on the aluminum foil side of this laminate, and then cooled. This was trimmed to obtain a circular lid (diameter 150 mm). In addition, the printing indicating the peeling direction was performed in conformity with the sheet feeding direction (MD direction). Hereinafter, the performance of the lid was evaluated in the same manner as in Example 1. The results obtained are shown in Table 1.

Example 6 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) 81% by weight of polypropylene having a melt index (MI) of 0.8 (melting point of 164 ° C.), 3% by weight of high-density polyethylene and calcium carbonate having an average particle size of 1.5 μm 1
The composition (A) containing 6% by weight was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) A composition (B) in which 54% by weight of polypropylene having an MI of 4.0 and 46% by weight of calcium carbonate having an average particle diameter of 1.5 μm are mixed, and a high density of 80% by weight of a polypropylene of MI 4.0 Polyethylene 10% by weight and average particle size 1.
The composition (C) mixed with 5% by weight of calcium carbonate (10% by weight) and the polypropylene having MI of 2 were melt-kneaded by separate extruders, and then melt-extruded into a sheet from a die, Laminated film on both sides of the 5 times stretched film of 1) and having a four-layer structure (B layer / A layer / C layer / D)
Layer) was obtained. Then, this laminated film having a three-layer structure
After cooling to 0 ° C., it is heated again to a temperature of about 160 ° C. and stretched 7.5 times in the transverse direction using a tenter.
Annealing treatment at a temperature of 5 ° C., cooling to a temperature of 60 ° C., slits in the ears, and a four-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching / uniaxial stretching) with a wall thickness of 80 μm (B /
A / C / D = 15 μm / 46 μm / 16 μm / 4 μm)
A base material layer of The void ratio of each layer is (B / A / C
/D=30%/29.7%/2.0%/0%). The printing surface was applied to the surface of layer B.

Example 7 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The results obtained are shown in Table 1. Manufacture of base material layer (1) Polypropylene having MI of 2 g / 10 min (melting point of about 1
64 ° C) 57% by weight, high-density polyethylene 22% by weight,
A resin composition (A) containing 18% by weight of calcium carbonate having an average particle size of 1.5 μm and 3% by weight of titanium oxide was melt-kneaded by an extruder and extruded into a sheet at a temperature of 200 ° C., followed by cooling. After cooling to a temperature of 60 ° C. with a device, the sheet was heated again to a temperature of 150 ° C., and then stretched 5 times in the machine direction to obtain a stretched film. (2) After melt-kneading a mixture (B) of 85 parts by weight of propylene / butene-1 / ethylene copolymer (melting point 142 ° C.) and 5 parts by weight of calcined clay at a temperature of 200 ° C. in separate extruders. , Melt-extruding this into a sheet from a die,
By laminating on the back surface of the 5 times stretched film of (1), a laminated film (A layer / B layer) having a two-layer structure was obtained. Then, after cooling the laminated film having the two-layer structure to 60 ° C.
Heated to a temperature of 8 ° C, stretched 7 times in the transverse direction using a tenter, annealed at a temperature of 165 ° C, cooled to a temperature of 60 ° C, slit the ears and double layer. Structure (biaxially stretched / uniaxially stretched), wall thickness 80 μm (A /
B = 70 μm / 10 μm) was obtained. The void ratio of each layer was (A / B = 33% / 0%). The printing surface was applied to the surface of layer A.

[0031]

[Table 1]

[0032]

EFFECT OF THE INVENTION The lid of the container of the present invention is heated by the steam supplied to the container, whereby the bimetal effect works and the container can be automatically sealed. There is no need to close the lid after the hot water is supplied and place a weight.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a lid of a container according to the present invention.

FIG. 2 is a perspective view of the lid and the container of the present invention in a state where hot water is poured into the container and the lid is closed.

FIG. 3 is a perspective view of the lid and the container of the present invention in a state in which the lid is opened, tools are put in the container, and hot water is not poured.

FIG. 4 is an enlarged cross-sectional view of a conventional lid.

FIG. 5 is a perspective view of a conventional lid and container in a state where hot water is poured into the container and is further opened.

FIG. 6 is a perspective view of the improper lid and the container in a state in which hot water is poured into the container and is closed too much and curved inward.

[Explanation of symbols]

1 Lid of container 1a Tip part of lid 2 Base material layer 2a Stretched resin film 2b, 2c Resin film 3 Adhesive layer 4 Metal layer 5 Heat sealable resin layer 6 Laminated sheet 7 Inorganic fine powder 8 Void 9 Container 10 Gap 11 Peeling off Direction display part 12 Dry noodle 13 Tool 14 Printing α Peeling direction β Direction with large value of thermal expansion coefficient γ Direction with small value of thermal expansion coefficient θ Angle within 45 degrees to direction β showing large expansion coefficient

[Procedure amendment]

[Submission date] March 26, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

However, such a lid of an instant food container has such a feature that when the lid of the container is partially opened and hot water is poured, the steam of the hot water passes through the aluminum layer on the inside of the lid to form a base material. As a result of heating the high-quality paper and releasing the water content in the high-quality paper, the high-quality paper contracts, the lid curls upward, and warps back (see FIG. 5). Therefore, the lid of an instant food container cooked with this kind of hot water conventionally requires the trouble of pouring hot water and then closing the lid of the opened lid by weighting the lid. It was As a container lid, a lid made by laminating a transparent biaxially oriented polyethylene film or a biaxially oriented nylon film on a paper or aluminum base material is automatically operated by the bimetal effect by the heat of the steam of the hot water poured into the container. It has been proposed to close it (Japanese Utility Model Publication No. 58-133574). However, with this lid, the shrinkage of the biaxially stretched film is too large, and
As shown in (4), the lid curls inward and the container cannot be closed tightly with the lid.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

Inorganic Fine Powder As the above inorganic fine powder, calcined clay, calcium carbonate, diatomaceous earth, titanium oxide, vermculite, talc, etc. can be mentioned, and the inorganic fine powder generally has a particle size of 0.03 to. Those having a thickness of 15 μm, preferably 0.1 to 5 μm are used.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

Physical Properties <Void> In the container lid of the present invention, the stretched resin film used for the base material layer 2 has a large number of fine voids (voids) 8 with the inorganic fine powder 7 as the core. Such a stretched resin film has a porosity of 4 to 60% calculated by the following formula,
It preferably has 8 to 50%. Porosity = [(ρ ₀ −ρ) / ρ ₀ ] × 100 ρ ₀ : Density of film before stretching ρ: Density of film after stretching

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

<Thermal Expansion Coefficient> In the lid of the container of the present invention, the thermal expansion coefficient (L _e ) of the base material layer is important. The coefficient of thermal expansion of such a base material layer was measured using a thermomechanical analyzer "TM-7000" (trade name) manufactured by Vacuum Riko Co., Ltd., using a test piece having a width of 5 mm and a length of 25 mm. Was fixed to a chuck, the span distance (L ₀ ) was set to 15 mm, and the load was 1 g, and then the temperature was raised from 30 ° C. to 80 ° C. over 5 minutes at a heating rate of 10 ° C./min. The span length (L) of the test piece at the temperature of ° C was measured, and the value (TMA method) obtained by the following equation is shown. Thermal expansion coefficient = [(L−L ₀ ) / L ₀ ] × 100 The value of this thermal expansion coefficient is 0.40 to 1.0%, preferably 0.55 to 0.85%. The value of this coefficient of thermal expansion is 1.
If it exceeds 0%, as shown in FIG. 6, the self-closing property of the lid 1 after pouring hot water into the container 9 is too fast, and the contents have not been steamed (the cup noodles are ready to be eaten). The tip part 1a of the lid that closed itself too much before was caught inside too much,
A gap 10 is created between the container 9 and the lid 1. Also,
When the value of the coefficient of thermal expansion is less than 0.40%, the time required for self-closing is too slow (takes 90 seconds to 3 minutes), which causes irritation to the eater. The value of the coefficient of thermal expansion of the base material layer obtained by the TMA method is a value obtained by subtracting the coefficient of thermal contraction of the stretched resin film from the coefficient of thermal expansion of the material tree of the stretched resin film.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

Example 1 Production of base material layer (1) 81% by weight of polypropylene having a MFR of 0.8 g / 10 min (melting point of about 164-167 ° C.), 3% by weight of high-density polyethylene and an average particle size of 1. The composition (A) containing 16% by weight of calcium carbonate of 5 μm was kneaded by an extruder set at 270 ° C., extruded into a sheet, and cooled by a cooling device to obtain an unstretched sheet. And
The sheet was heated again to a temperature of 150 ° C. and then stretched 5 times in the machine direction. (2) 54% by weight of polypropylene having a MFR of 0.4 g / 10 min (melting point of about 164-167 ° C.) and an average particle size of 1.5.
The composition (B) mixed with 46% by weight of calcium carbonate (μm) was kneaded in another extruder, and then extruded into a sheet form from a die, which was laminated on both sides of the 5 × stretched film of (1). Then, a laminated film having a three-layer structure was obtained. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 175 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C. and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A / B = 20 μm / 40 μm).
m / 20 μm) was obtained. The void ratio of each layer is (B / A / B = 4.6% / 13.9% / 4.6%).
Met. Manufacture of Lid The surface of the above-mentioned certain material layer was printed, and further, an anchor coating agent of urethane prepolymer was applied to the back surface side so as to be 3 g / m ^2, and an aluminum foil having a thickness of 6 μm was laminated on this. . On the aluminum foil side of this laminate, an ethylene / vinyl acetate copolymer (vinyl acetate content 5.4% by weight) was extruded at 200 ° C. (thickness: 22%).
μm) and then cooled. This was trimmed to obtain a substantially circular lid (diameter 150 mm). The printing such as the arrow indicating the peeling direction of the surface of the lid was matched with the sheet feeding direction (MD direction). 250 g of dried noodles and 25 g of ingredients were put in a container made of expanded polystyrene having a heat seal content of 1,000 cc and a diameter of about 150 mm, and the lid was heat-sealed by applying pressure at 140 ° C. for 0.5 seconds. Evaluation After standing for one day, pull the lid with your finger in the direction of the arrow of the peeling portion printed on the lid of the expanded polystyrene container to open 2/3 of the lid, and boil from this opening. 600 cc of hot water (temperature of about 91 ° C.) was poured into the container for 5 seconds to measure the self-closing property of the lid. The results obtained are shown in Table 1.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Example 2 The procedure of Example 1 was repeated except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) Polypropylene 8 with MFR of 0.8 g / 10 min
After kneading the composition (A) in which 1% by weight was mixed with 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle size of 1.5 μm with an extruder set at 270 ° C.,
It was extruded into a sheet and cooled by a cooling device to obtain a non-stretched sheet. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) Composition (B) in which 54% by weight of polypropylene having an MFR of 4 g / 10 min and 46% by weight of calcium carbonate having an average particle size of 1.5 μm are mixed, and MFR is 4.0 g / 10.
Minute polypropylene 81% by weight and high density polyethylene 3
The composition (C) in which 1% by weight and 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm are mixed and melt-kneaded in another extruder, and then melt-extruded in a sheet form from a die. Is laminated on both sides of the 5 times stretched film of (1),
A laminated film having a three-layer structure was obtained. Next, after cooling the laminated film having the three-layer structure to 60 ° C.
Heated up to ℃, stretched 7.5 times in the transverse direction using a tenter, annealed at 165 ℃, cooled to 60 ℃, slit the ears, three layers Structure (uniaxially-stretched / biaxially-stretched / uni-glaze-stretched), thickness 80
A base layer of μm (B / A / C = 16 μm / 48 μm / 16 μm) was obtained. The void ratio of each layer is (B / A / C
= 30% / 29.7% / 3.0%). The printing surface was applied to the surface of layer B.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Example 3 The procedure of Example 1 was repeated except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) 77% by weight of polypropylene having a MFR of 2 g / 10 min (melting point of about 164 ° C.), 10% by weight of high-density polyethylene, 10% by weight of calcium carbonate having an average particle size of 1.5 μm,
Further, a resin composition containing 3% by weight of titanium oxide is melt-kneaded by an extruder and extruded into a sheet at a temperature of 200 ° C. The sheet is cooled again by a cooling device, and then the sheet is re-extracted again.
After heating in a warm oven at 50 ° C., it was stretched 5 times in the machine direction to obtain a stretched film. Then, after heating again to a temperature of 158 ° C., it is stretched 7 times in the transverse direction, annealed at a temperature of 164 ° C., cooled to a temperature of 60 ° C., and the ears are slit to reduce the wall thickness. A 50 μm monolayer biaxially oriented film was obtained. The void ratio of this monolayer structure biaxially stretched film was 44.7%.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

Example 4 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) 81% by weight of polypropylene (melting point 164 ° C.) having MFR of 0.8 g / 10 min, and high density polyethylene 3
The composition (A), in which 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm is mixed, is kneaded by an extruder set at 270 ° C., then extruded into a sheet, and cooled by a cooling device. A stretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) Polypropylene 5 with MFR of 4.0 g / 10 min
4% by weight and calcium carbonate 46 having an average particle size of 1.5 μm
After kneading the composition (B) mixed with 1% by weight in another extruder, this is extruded into a sheet form from a die, and this is laminated on one side of the 5 times stretched film of (1) to form two layers. A laminated film having a structure was obtained. Then, this composition (B) and M
A polypropylene (C) having an FR of 4.0 g / 10 min was melt-kneaded in another extruder, and then laminated in a die to form a two-layer laminate having the two-layer structure of the above (2). Polypropylene (C) was laminated on the side of the composition (B) on which the sheet layer was not laminated, to obtain a laminated film having a four-layer structure. Then, after cooling the laminated film having the four-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C., and then 7.5 times in the lateral direction using a tenter.
Double stretching and annealing at 165 ° C.
Cool to 0 ° C and slit the ears (C / B /
A / B = 5 μm / 16 μm / 48 μm / 11 μm) was obtained as a base layer having a four-layer structure. The void ratio of each layer is (C / B /
A / B = 0% / 45% / 16% / 45%). The printing surface was applied to the surface of the C layer.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

Example 5 The same procedure as in Example 1 was carried out except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Production of base material layer (1) Polypropylene 8 with MFR of 0.8 g / 10 min
After kneading the composition (A) in which 1% by weight was mixed with 3% by weight of high-density polyethylene and 16% by weight of calcium carbonate having an average particle size of 1.5 μm with an extruder set at 270 ° C.,
It was extruded into a sheet and cooled by a cooling device to obtain a non-stretched sheet. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) Polypropylene 5 with MFR of 4.0 g / 10 min
4% by weight and calcium carbonate 46 having an average particle size of 1.5 μm
After kneading the composition (B) mixed with the weight% by another extruder, it is extruded into a sheet form from a die and laminated on both sides of the (5) stretched film of (1) to give a three-layer structure. A laminated film of was obtained. Next, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C., and the ears are slit to form a three-layer structure (uniaxially stretched / biaxially stretched / uniaxially stretched) having a wall thickness of 80 μm (B / A
/ B = 16 μm / 48 μm / 16 μm). The void ratio of each layer is (B / A / B = 30% /
33.7% / 30%).

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

Example 6 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The results obtained are shown in Table 1. Manufacture of base layer Synthetic paper "Yupo FPG #" made by Oji Yuka Synthetic Paper Co., Ltd., which is made of multi-layer stretched polypropylene film containing inorganic fine powder
80 "(trade name, wall thickness 80 μm) was used. (Void ratio of base material layer 33%)

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Comparative Example 1 A substrate layer was prepared in the same manner as in Example 1 except that it was prepared as follows. The results obtained are shown in Table 1. Production of base material layer A transparent unstretched polypropylene film "Taiko FHK2" (trade name, wall thickness 60 μm) manufactured by Nimura Sansho Co., Ltd. was used (void ratio of base material 0%).

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Comparative Example 2 The procedure of Example 1 was repeated except that the substrate layer was produced as follows. The results obtained are shown in Table 1. Production of base material layer Paper for base material of commercially available cup ramen lid ("Cormorant" (trade name) of Fuji Kako Co., Ltd. (wall thickness 90 μm,
A weighed amount of 82.4 g / m ² ) was used.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

Example 7 Production of Substrate Layer (1) 81% by weight of polypropylene (melting point 164 ° C.) having MFR of 0.8 g / 10 min, high density polyethylene 3
The composition (A), in which 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm is mixed, is kneaded by an extruder set at 270 ° C., then extruded into a sheet, and cooled by a cooling device. A stretched sheet was obtained. Then, this sheet was heated again to a temperature of 150 ° C. and then stretched 5 times in the machine direction. (2) Polypropylene 5 with MFR of 4.0 g / 10 min
5% by weight and calcium carbonate 45 having an average particle size of 1.5 μm
MFR with composition (B) mixed with wt% is 4.0 g / 1
After 0 minutes of polypropylene (C) was melted and kneaded in separate extruders, it was extruded into a sheet form from a die and laminated on both sides of the 5 times stretched film of (1) to obtain a three-layer structure. A laminated film was obtained. Then, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 175 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. And then 60
Cooled to a temperature of ℃, slit the ears and have a three-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching), thickness 80 μm
A base material layer (B / A / C = 20 μm / 40 μm / 20 μm) was obtained. The void ratio of each layer is (B / A / C =
It was 5.2% / 14.2% / 0%). The printing is performed on the B layer side. Manufacture of lid: The surface of the above-mentioned base material layer is printed, and further, an anchor coating agent of urethane prepolymer is applied to the back surface side so as to be 3 g / m ^2, and an aluminum foil having a thickness of 6 μm is dry laminated on this. did. An ethylene / vinyl acetate copolymer (vinyl acetate content 5.4% by weight) was extrusion laminated (wall thickness: 22 μm) at a temperature of 200 ° C. on the aluminum foil side of this laminate, and then cooled. This was trimmed to obtain a circular lid (diameter 150 mm). In addition, the printing indicating the peeling direction was performed in conformity with the sheet feeding direction (MD direction). Hereinafter, the performance of the lid was evaluated in the same manner as in Example 1. The obtained results are shown in Table 2.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

Example 8 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The obtained results are shown in Table 2. Production of base material layer (1) 81% by weight of polypropylene (melting point 164 ° C.) having MFR of 0.8 g / 10 min, and high density polyethylene 3
The composition (A), in which 16% by weight of calcium carbonate having an average particle diameter of 1.5 μm is mixed, is kneaded by an extruder set at 270 ° C., then extruded into a sheet, and cooled by a cooling device. A stretched sheet was obtained. Then, this sheet was heated again to a temperature of 140 ° C. and then stretched 5 times in the machine direction. (2) Polypropylene 5 with MFR of 4.0 g / 10 min
4% by weight and calcium carbonate 46 having an average particle size of 1.5 μm
The composition (B) in which the weight% is mixed with MFR is 4.0 g /
Composition (C) prepared by mixing 80% by weight of polypropylene for 10 minutes with 10% by weight of high-density polyethylene and 10% by weight of calcium carbonate having an average particle size of 1.5 μm and MFR of 2 g /
After 10 minutes of polypropylene and melt-kneading with separate extruders, this is melt-extruded into a sheet form from a die, which is laminated on both sides of the 5 times stretched film of (1) to form a four-layer structure. A film (B layer / A layer / C layer / D layer) was obtained.
Next, after cooling the laminated film having the three-layer structure to 60 ° C., it is heated again to a temperature of about 160 ° C., stretched 7.5 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. Then, it is cooled to a temperature of 60 ° C., and the ears are slit to form a four-layer structure (uniaxial stretching / biaxial stretching / uniaxial stretching / uniaxial stretching) with a wall thickness of 80 μm (B / A / C / D =
A base material layer having a thickness of 15 μm / 46 μm / 16 μm / 4 μm) was obtained. The void ratio of each layer is (B / A / C / D = 30%
/29.7%/2.0%/0%). The printing surface was applied to the surface of layer B.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

Example 9 A substrate layer was produced in the same manner as in Example 1 except that it was produced as follows. The obtained results are shown in Table 2. Production of base material layer (1) 57% by weight of polypropylene having a MFR of 2 g / 10 min (melting point of about 164 ° C.), 22% by weight of high-density polyethylene, 18% by weight of calcium carbonate having an average particle size of 1.5 μm,
And a resin composition (A) containing 3% by weight of titanium oxide
Was melt-kneaded by an extruder and extruded into a sheet at a temperature of 200 ° C., which was cooled to a temperature of 60 ° C. by a cooling device, and the sheet was heated again to a temperature of 150 ° C.,
It was stretched 5 times in the machine direction to obtain a stretched film. (2) After melt-kneading a mixture (B) of 85 parts by weight of propylene / butene-1 / ethylene copolymer (melting point 142 ° C.) and 5 parts by weight of calcined clay at a temperature of 200 ° C. in a separate extruder. , Melt extruding this into a sheet from a die,
This was laminated on the back surface of the 5-fold stretched film of (1) to obtain a laminated film (A layer / B layer) having a two-layer structure. Next, after cooling the laminated film having the two-layer structure to 60 ° C., it is heated again to a temperature of about 158 ° C., stretched 7 times in the transverse direction using a tenter, and annealed at a temperature of 165 ° C. And cooled to a temperature of 60 ° C., the ears are slit to form a two-layer structure (biaxially stretched / uniaxially stretched), and the wall thickness is 80 μm.
A base material layer of (A / B = 70 μm / 10 μm) was obtained. The void ratio of each layer was (A / B = 33% / 0%). The printing surface was applied to the surface of layer A.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[0031]

[Table 1]

[Table 2]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Funato 23, Towada, Kamisu-machi, Kashima-gun, Ibaraki Prefecture Okaka Synthetic Paper Co., Ltd., Kashima Plant (72) Inventor Takashi Miyaji, Kamisu, Kashima-gun, Ibaraki Prefecture 23, Towada, Oji Petrochemical Synthetic Paper Co., Ltd., Kashima Plant (72) Inventor, Yukio Obama 826, Hagien, Fukuda, Chigasaki City, Kanagawa Tokai Metal Co., Ltd., Chigasaki Plant (72) Inventor, Yamada Wan, 826 Hagiden, Chigasaki, Kanagawa, Kanagawa Prefectural Tokai Metals Co., Ltd., Chigasaki Plant (72) Inventor, Toshiaki Watanabe 826, Hagien, Chigasaki, Kanagawa, Chigasaki, Tokai Metals (72) Inventor Chiaki Kanai 826 Fukuda, Hagien, Chigasaki City, Kanagawa Prefecture Tokai Metal Co., Ltd. Chigasaki Plant

Claims (2)

[Claims] 1. A lid, which is composed of a laminated sheet of a base material layer / adhesive layer / metal layer / heat-sealable resin layer, and is used for sealing a container, wherein the lid has the heat-sealable resin layer interposed therebetween. In a lid in which the direction of peeling off the lid from the container is indicated by printing on the surface of the lid when heat-sealed to the container, the base material layer contains a stretched resin film having many fine voids inside. It is formed of a single layer or a layer made of a laminated sheet containing a stretched resin film having a large number of fine voids inside, and the printed peeling direction is the temperature rising rate of the base material layer of the lid portion of 10 ° C./min. 5 minutes at 30 ℃
A lid of a container, which is provided so as to match the direction in which the coefficient of thermal expansion is large when the temperature is raised from the temperature of 80 to 80 ° C. 2. The lid of the container according to claim 1, wherein the base material layer has the following properties (1) to (3). (1) The base material layer is heated at a heating rate of 10 ° C / minute for 5 minutes to 30 ° C.
When the temperature is increased from 80 ° C. to 80 ° C., the coefficient of thermal expansion in the direction of peeling the base material layer is 0.40 to 0.40.
Be within the range of 1.0%. (2) The tensile elastic modulus in the direction of peeling off the base material layer is in the range of 10,000 to 45,000 kg / cm ² . (3) The thickness of the base material layer is thicker than the thickness of the metal layer.