JPH04117732U - Metal foil container with visible contents - Google Patents

Abstract

(57) [Summary] [Purpose] Retort resistance, long-term storage, oxygen barrier properties,
To develop a container that is resistant to moisture infiltration, allows the contents to be seen, and has good dimensional stability even at high temperatures that can be heated in a toaster oven or microwave oven. [Configuration] Metal foil container body 12 and CPP50 to 20
A flange portion 15 that can heat-seal a laminated sheet configured in the order of 0 μm/barrier layer/CPP 50 to 200 μm/sealant and a flat portion 14 that fits into the upper open portion of the container.
A metal foil container consisting of a lid body 13 consisting of. [Effects] Due to the above structure, productivity is high, packaging can be done using an automatic packaging line, and it not only has excellent retort resistance, oxygen barrier properties, and long-term storage stability, but also allows contents to be seen and can be processed even at high temperatures. Good dimensional stability.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This device can be stored for a long time in an oxygen-tight environment, and can be stored in a toaster oven or electronic oven. You can see the contents being heated by the grill, such as frozen foods, tsukudani, etc. This invention relates to metal foil containers suitable for distribution and storage of food products.

0002

[Conventional technology]

Conventionally, oven containers (heat-sealable and Heat resistant and can be heated using a toaster oven or microwave refers to metal foil containers. This material is mainly made of epoxy resin and maleic anhydride. Graft-modified polypropylene resin is baked onto metal foil and cooled. deep-drawn products) may be stored for a long period of time at room temperature; Metal foil whose sealing surface is made of polyolefin resin or hot melt, etc. A composite laminated sheet is used to improve oxygen barrier properties and prevent moisture from entering. Lid body Since metal foil is also used for the Although it has excellent properties, it is impossible to see the contents at all, so when it comes to food, The problem arises in that the condition of the contents cannot be known until the purchaser opens the package. There is.

0003

[Problem that the idea aims to solve]

This invention has the excellent retort resistance, long-term storage stability, and oxygen barrier of conventional metal foil containers. A toaster oven that allows you to see the contents of the container while maintaining its rear and moisture intrusion resistance. - or to develop containers that can be heated in a microwave oven.

0004

[Means to solve the problem]

This invention achieves the above purpose by deep drawing processing with a flange section for heat sealing. Container body made of metal foil and CPP 50-200 μm from the surface/oxygen barrier property Composed in the order of film/CPP/polyolefin sealant, and CPP A composite laminated sheet with a total thickness of 100 to 300 μm is placed on the flange of the container body. Lid body consisting of a heat-sealable flange part and a flat part that fits into the top opening of the container We succeeded by developing a container that allows you to see the contents by combining Ta.

[0005] The present invention will be explained below with reference to the drawings. Figure 1 is an external view of the metal foil container according to the present invention, and Figure 2 is a composite foil container used for the lid. FIG. 3 is a cross-sectional view of a layered sheet. That is, in the present invention, what is the container body 12 made of metal foil? , mainly made of epoxy resin and anhydrous male aluminum foil with a thickness of about 80 to 150 μm. Polypropylene graft-modified with inic acid is baked and coated to make the food that is the content. Even during long-term storage with acids, alkalis, or salt, and even when heated, the metal The metal foil is coated with a protective coating to prevent corrosion, and a flange is used for sealing. This is a deep-drawn container with a groove. The outside of the container is usually a heat-resistant ink It is printed by.

[0006] The lid body 13 is made of CPP (casting polypropylene film) 1/adhesive 2/ Oxygen barrier film 3/Adhesive 4/CPP6/Adhesive 7/Olefin sealer It is made by processing a composite laminated sheet consisting of 5 components. CPP1 and CPP6 are The thickness is 50 to 200 μm, and adhesives 2, 4, and 7 are mainly urethane adhesives. 6 μm thick, polyvinylidene chloride film or ethylene film as barrier film 3. The thickness of the saponified tyrene-vinyl acetate copolymer film is preferably about 15 to 40 μm. In other words, a film of about 15 to 25 μm is further attached to a film of 20 to 60 μm using adhesive 4. A composite sheet in which a thick polyolefin sealant 5 is laminated is used. this The flange part of the container body 12 and the heater are bonded to the composite laminated sheet by compressed air or vacuum forming. It has a flange part 15 that can be sealed and a flat part 14 that fits into the upper opening part of the container. The lid body 13 is made as follows.

[0007] The manufacturing method for composite sheets is not particularly limited, but CPP can be used as a barrier film. Because of the lack of adhesive properties, dry lamination is required. Adhesion Prior to this, the CPP film should be pre-treated such as discharge treatment and primer treatment. This is advantageous in subsequent processing since the adhesive strength is improved.

[0008] The adhesives 2, 4 and 7 should be selected depending on the use of the metal foil container 11 , such as boiling adhesives when heat sterilized at 70 to 100°C, and retort adhesives when used at 100 to 130°C. If a higher temperature than this is required, it is necessary to use a high retort adhesive.

[0009] Oxygen barrier films are used to prevent packaging contents from being exposed to atmospheric oxygen or moisture. Salt that has oxygen barrier properties even if it is transparent to prevent oxidation or deterioration. Vinylidene dihydride or saponified ethylene-vinyl acetate copolymer is used. deer When using hot water or steam for heat sterilization, use ordinary ethylene-vinyl acetate. With saponified copolymers, water absorption causes a decrease in barrier properties and whitening of the film. Since it is highly dangerous, polyvinylidene chloride film or polyvinylidene film is used as a barrier film. Saponified ethylene-vinyl acetate copolymer with excellent heat resistance, retort resistance, and transparency (For example, EVAL RT-Grade Kuraray Co., Ltd.) is preferably used. .

0010 Polyolefin sealant 5 also needs to be used differently depending on its heat resistance (usage temperature). For low temperature applications, ethylene-vinyl acetate copolymer, low-density polyethylene, etc. As the temperature increases, the sealant based on high density polyethylene, polypropylene A sealant based on Ren or the like is used.

[0011] Easy-peel polypropylene-based or polyethylene-based sealer As a result of heat sealing, the sheet has a heat sealing strength of 0.5 to 2.0 kg/15 mm width. usually preferred. If the width is less than 0.5kg/15mm, there is a problem with sealing performance. If it is stronger than 2.0 kg/15 mm width, it will be difficult to open and the lid 13 or the container body will be damaged. 12 may cause damage.

0012 The composite laminated sheet of this invention has an oxygen barrier film sandwiched between two sheets of CPP. In this case, each CPP has a thickness of 50 mm. ~200 μm, and CPP6 is 1/3 to 2 times the thickness of CPP1 on the surface. Therefore, the total thickness of CPP1 on the surface and this CPP6 falls within 100 to 300 μm. It is preferable to do so.

[0013] CPP is used to ensure the dimensional stability of the lid, especially when the oxygen barrier film is When it is a saponified tyrene-vinyl acetate copolymer, the thickness of CPP on both sides is the same. Or, the smaller the difference in thickness, the higher the dimensional stability of the laminated sheet and lid. can get. Of course, the same applies to polyvinylidene chloride film. this is This is to restrain the barrier film by sandwiching it with CPP from both sides. It is estimated that The total thickness of the laminated film composited in this way is Processed by molding or vacuum forming, etc. to ensure proper sealing (pressure during sealing, thermal buffering properties) ), a thickness of 150 to 400 μm is required to make the lid body 13 dimensionally stable. Ru.

[0014]This composite sheet is formed into a lid material by ordinary pressure forming or vacuum forming. For packaging, the metal foil container 11 is filled with contents using a normal automatic packaging line and can be packaged by heat sealing.

[0015]

[Effect]

In the present invention, the metal foil container body 12 and CPP/adhesive/oxygen barrier film Composite laminate system consisting of rubber/adhesive/CPP/adhesive/olefin sealant Since the lid body 13 is made of processed aluminum, the oxygen barrier film is properties, moisture intrusion resistance, and resulting long shelf life and heatability as food containers. It was possible to obtain a metal foil container whose contents could be seen without opening the container.

[0016] Also, the lid body is not a flat lid type that is normally heat sealed, but a flange part. Since it is a so-called drop-lid type consisting of a flat part, it is easy to punch out after heat sealing. Since there is no need for trimming, etc., filling speed can be increased, and the filling and sealing machine can be used more easily. There is a wide range of choices and a wide range of applications. Furthermore, the deep-drawn container body reduces capacity. It can be made large, has good sealing properties, and can be heat sterilized (retort sterilization). Therefore, it is useful as a container for foodstuffs, etc.

[0017]

【Example】

CPP 70μm (Tohcello Co., Ltd. RXC-3), dry lamination adhesive 4 μm (Dainippon Ink Co., Ltd., LX-747A/KX75), barrier layer Etile saponified vinyl acetate copolymer 15 μm (Kuraray Eval RT- grade), dry laminate adhesive 4μm, CPP 70μm, dry laminate nate adhesive 4μm, polyolefin sealant 50μm (Toray Gosei Co., Ltd.) ) CF-9501A) The lid body was formed by pressure forming using a laminated sheet constructed in the order of CF-9501A). was molded. The container body is baked coated with modified polypropylene on aluminum foil. It has a flange portion (for heat sealing) with an inner diameter of approximately 10 cm. Of test Therefore, when we heat-sealed both (the lid and the container body) on an automatic packaging line, they were smooth. Even if a seal is formed on the container and it is retort sterilized at 120℃ for 30 minutes, it will not heat up. It becomes transparent in a short time after processing, and the packaging is intact, with no visible damage to the packaging. Ta. Furthermore, even if only the lid is subjected to retort treatment, there is almost no distortion, resulting in dimensional stability. It was confirmed that it was excellent.

[0018]

[Effect of the idea]

The metal foil container according to the present invention can be produced at low cost, and the container format is heat-sealable. Since automatic packaging is possible using an automatic packaging line using Not only is it good, but it is also easy to open, making it an extremely excellent container for packaging foods, etc. . In particular, the lid has excellent heat resistance (dimensional stability at high temperatures), so this container is made of metal. Heat resistance (heat sterilization such as retort sterilization) is an excellent property of metal foil containers made of metal foil. (can be heated in an oven), oxygen barrier properties, long shelf life, and contents It has the characteristic of being visible and can be widely used as a container for packaging foods, etc.

[Brief explanation of drawings]

FIG. 1 is an external view of a metal foil container of the present invention.

FIG. 2 is a sectional view of a composite laminated sheet used for the metal foil container lid of the present invention.

[Explanation of symbols]

1 CPP 2 Adhesive 3 Barrier film 4 Adhesive 5 Olefin sealant 6 CPP 7 Adhesive 11 Metal foil container 12 Container body 13 Lid 14 Flat part 15 Flange part

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B32B 27/28 102 6122-4F 27/30 C 8115-4F 27/32 8115-4F B65D 8/16 6540−3E 25/54 6540−3E // B29L 9:00 4F 22:00 4F

Claims (3)

[Scope of utility model registration request] Claim 1: A container body made of metal foil formed by deep drawing and provided with a flange portion for heat sealing, and a container body made of metal foil from the surface.
PP50-200μm/Oxygen barrier film/CPP
/polyolefin sealant, and C
It is characterized by combining a composite laminated sheet with a total thickness of PP of 100 to 300 μm and a lid body consisting of a flange part that can be heat-sealed to the flange part of the container body and a flat part that fits into the open top part of the container. A container whose contents can be seen. 2. The metal foil container according to claim 1, wherein the lid is a transparent lid comprising a flat part that fits into the upper opening of the container body and a seal part that is heat-sealed at the flange of the container body. 3. The metal foil container according to claim 1, wherein a polyvinylidene chloride film or a saponified ethylene-vinyl acetate copolymer is used as the oxygen barrier film of the lid.