JPH047957Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lid material used for a plastic container.

[Conventional technology]

In recent years, plastic containers have come into widespread use for processed foods and various other products, but many require gas barrier properties depending on the contents to be stored in the containers.

As described above, in order to maintain gas barrier resistance during long-term storage in products that require gas barrier properties, the solution is to laminate aluminum foil as a lid material.

[Problems that this invention attempts to solve]

As mentioned above, lids with metals such as aluminum foil laminated on them have excellent gas barrier properties, but if you heat them directly in a microwave oven with the lid attached, the aluminum foil will be laminated. There is a risk of ignition in that area and damage to the lid material.

Therefore, in the case of a lid material laminated with aluminum foil, it is necessary to remove the aluminum foil beforehand and then place the lid material in a microwave oven, which is inconvenient in handling.

On the other hand, in order to prevent the moisture content from scattering when directly heated in a microwave oven or the like, some lids are covered with polyethylene or vinylidene chloride film. However, this method has the disadvantage that if the container is heated directly in a microwave oven or the like with the lid attached, the vapor pressure inside the container will rapidly increase due to heating, causing damage to the container or lid, and the contents spilling out. However, there is a drawback in that the lid must be partially opened and heated.

The present invention was developed as a result of research to improve the above-mentioned drawbacks of the conventional technology.It has the ability to maintain gas barrier resistance, can be heated directly in a microwave oven, etc., and does not damage the container, lid, etc. due to the steam pressure inside the container. Our goal is to provide a lid material that is unique to the market.

[Means for solving problems]

In the present invention, a polypropylene coat layer is formed as the innermost layer of an outer layer made of a laminate of aluminum foil and a plastic film, and an inner layer made of a plastic laminate without laminated aluminum foil is formed with a polypropylene coat layer of the outer layer. is integrally laminated with polyethylene interposed therebetween, and is adhesively sealed to the flange of the container by a laminate of plastic film with no aluminum foil laminated thereon, and a laminate of plastic film with no aluminum foil laminated thereon. The body has a cut for peeling in the part that corresponds to the flange of the container, and multiple holes or cuts in the part that corresponds to the open part of the container, so that when heating the container in a sealed state, the aluminum The outer layer made of a laminate of foil and plastic film is pulled upward, the inner layer made of a laminate of plastic film on which aluminum foil is not laminated is cut at a peeling cut, and the outer layer is peeled off. This lid material for a plastic container is constructed so that it can be heated while being sealed with a laminate of plastic film that is not laminated with a polyethylene layer.

[action, effect]

The present invention has the above-mentioned structure, and a laminate of aluminum foil and plastic film (hereinafter referred to as an aluminum-containing laminate) is basically a laminate of plastic film and aluminum foil laminated with an adhesive. It is.

Plastic film is polyester, nylon or oriented polypropylene (OPP).
Various types such as can be used. Furthermore, a brand or pattern can be printed on the plastic film as required.

Although the aluminum foil and plastic film are laminated with an adhesive, the present invention is not limited to adhesives; after applying an anchor coat to the surface of the plastic film, polyethylene, ionomer, etc. It may also be a laminate of plastic such as ethylene acrylic acid or ethylene methacrylic acid.

Further, a biaxially oriented polypropylene coat layer (CPP layer) is formed on the back surface of the aluminum foil as the outer layer via an adhesive. The adhesive layer in the holder may be made of an anchor coat treated like the above-mentioned adhesive and laminated with a plastic such as polyethylene, ionomer ethylene acrylic acid or ethylene methacrylic acid. Further, the CPP may be an OPP film.

In addition, the plastic film laminate without aluminum foil (hereinafter referred to as the aluminum-free laminate) is made of the same plastic as that used for the outer plastic film whose surface has been anchor-coated, as well as oriented polyethylene (OPE). ) can be used. Further, the plastic film can be printed on either the front or back side, and an easy-to-open sealant is laminated on the back side of the plastic film via an adhesive.

In addition, after the aluminum-free laminate is formed into a predetermined shape, a cut for peeling is provided in the part that corresponds to the flange of the container, and a plurality of holes or cuts are appropriately provided in the part that corresponds to the open part of the container. It is being

The two laminates are aluminum-containing laminates.
The CPP layer and the anchor-coated surface of the aluminum-free laminate are integrally laminated with a polyethylene layer interposed therebetween to form the lid material.

The lid material is sealed by adhering to the flange of the container with a lowermost layer of easy-to-open sealant. Therefore, since the lid of the container is laminated with aluminum foil, sufficient gas barrier properties can be maintained during storage or transportation, and the container can withstand long-term storage.

Next, when heating the sealed container directly in a microwave oven, etc., pull the upper aluminum-containing laminate (outer layer) upward and cut the laminate without aluminum (inner layer) at the peeling cut. At the same time, it peels off at the surface of the CPP layer formed as the innermost layer of the outer layer. The CPP layer and the polyethylene layer are laminated with moderate adhesive strength, so there is no risk of them peeling off during storage or transportation, but if you pull the outer layer as described above, it will peel off easily, and the container will be a laminate without aluminum ( It is sealed by the inner layer) and the polyethylene layer on the surface.

In other words, the lid of the container is sealed without the aluminum foil, so if you heat it as is in a microwave oven, etc., there is no risk of ignition caused by the aluminum foil of the lid, and the container will be sealed. , can be heated safely without damaging the lid, etc.

In addition, if the vapor pressure inside the container increases due to heating, if the polyethylene layer corresponding to the positions of the multiple holes or cuts provided in the inner layer is punctured with a needle or scissor, multiple Steam is released to the outside through the holes or cuts in the container, so there is no risk of damage to the container or lid due to heating. For products that do not require direct heating in a microwave oven or the like, the lid material in which the outer layer and the inner layer are integrally laminated may be peeled off at the easily releasable sealant part.

As described above, in the present invention, the lid material is made of an aluminum-containing laminate and an aluminum-free laminate that are integrally laminated with a polyethylene layer interposed between them, so gas barrier properties are maintained sufficiently during storage or transportation. be able to.

In addition, when heating directly in a microwave oven, the aluminum-containing laminate is peeled off and heated, so there is no fire caused by the aluminum and there is no damage to the container or lid material.

Furthermore, since the aluminum-free laminate has appropriate holes or cuts, even if the aluminum-free laminate is heated while sealed, the vapor pressure generated by heating can be released from the holes or cuts. Therefore, there is no damage to the container, lid, etc. due to an increase in internal pressure.

〔Example〕

FIGS. 1 to 5 show an embodiment of the present invention. Next, the present invention will be specifically explained based on these drawings.

A lid material 1 is composed of a laminate 2 containing aluminum and a laminate 3 without aluminum. Aluminum-containing laminate 2
The top layer is polyester, nylon or OPP
A printed portion 5 is appropriately formed on the back surface of a plastic film layer 4 such as the above, an aluminum foil 7 is laminated on the surface of the printed portion 5 via an adhesive layer 6, and an adhesive layer 8 is further formed on the back surface of the aluminum foil 7. through
A CPP layer 9 is formed.

Instead of an adhesive, the adhesive layers 6 and 8 may be appropriately anchor coated and laminated with polyethylene or an ionomer such as ethylene acrylic acid or ethylene methacrylic acid.

The laminate 3 without aluminum is made of a plastic film 10 made of polyester, nylon, OPP, OPE ethylene vinyl alcohol copolymer (EVAL), or polyvinyl alcohol resin.
A printed part 11 is formed on the surface of the plastic film 10, an anchor coat treatment 12 is applied to the surface of the printed part 11, and an easy-to-open sealant 14 is laminated on the back surface of the plastic film 10 via an adhesive layer 13. still,
The printed portion 11 is not limited to the front surface, but may be printed on the back surface.

After forming the aluminum-free laminate 3 into a predetermined shape, it is placed in a container 15 as shown in FIGS. 2 and 3.
Cut 1 for peeling in the part that corresponds to the flange 16 of
7 is provided, and a plurality of holes 18 are provided at the opening of the container 15. The peeling cut 17 and the plurality of holes 18 can be easily formed using a punch method or a laser beam. Note that the hole 18 is
Although it is shown in an enlarged state for convenience of explanation in FIGS. 2 to 5, it is actually formed to have a minute diameter.

Furthermore, in the aluminum-containing laminate 2 and the aluminum-free laminate 3, the CPP layer 9, which is the innermost layer of the aluminum-containing laminate 2, and the anchor coat treated surface 12 of the aluminum-free laminate 3 are polyethylene layers. 19
The aluminum-containing laminate 2 is used as the outer layer, and the aluminum-free laminate 3 is used as the inner layer to form the lid 1.

In the lidding material 1 of the present invention, after the contents are stored in the container 15, the easy-open sealant 14 of the aluminum-free laminate 3 is adhered to the flange 16 of the container 15 for sealing.

Since the lid material 1 of the present invention includes the aluminum foil 7, it has excellent gas barrier properties during storage and transportation, and can withstand long-term storage.

Next, when heating the container 15 sealed with the lid material 1 directly in a microwave oven or the like, the aluminum-containing laminate 2 is pulled upward and the laminate 3 without aluminum is heated.
The polyethylene 19 is cut at the peeling cut 17, the aluminum-containing laminate 2 is peeled off, and the laminate 3 without aluminum and the polyethylene layer 19 are sealed together and heated in a microwave oven.

That is, in this state, the aluminum foil 7 of the lid material 1
Since it has been removed, there is no risk of ignition even if it is heated directly in the microwave, and it can be heated safely.

Further, the plurality of holes 18 provided in the laminate 3 without aluminum are covered with a polyethylene layer 19, but when the vapor pressure increases due to heating, the portions corresponding to the holes 18 are covered with a polyethylene layer 19. Alternatively, if the polyethylene layer 19 is pierced with a needle or the like, the vapor pressure generated by heating can be released from the hole 18, thereby avoiding damage to the container 15 and the lid due to the increase in vapor pressure caused by heating.

In addition, if the contents do not require heating, in order to remove the contents, it is sufficient to peel off the lid 1 with the easy-open sealant 14 in one motion. It has the advantage that it can be applied to anything that is not required.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of one embodiment of the present invention;
The figure is a plan view of the state attached to the container, and Figure 3 is
Figure 2 is a cross-sectional view taken along the line - Figure 4 is a cross-sectional view of the aluminum-containing laminate in Figure 3 which has been peeled off;
The figure is a cross-sectional view of a sealed state with a laminate without aluminum. 1... Lid material, 2... Aluminum-containing laminate, 3...
Laminate without aluminum, 4, 10... Plastic film layer, 5, 11... Printing section, 6, 8, 13
... Adhesive layer, 7 ... Aluminum foil, 9 ...
CPP layer, 12... Undercoat, 14... Easy-open sealant, 15... Container, 16... Flange, 17... Peeling cut, 18... Hole, 19
...Polyethylene layer.

Claims (1)

[Scope of utility model registration request] A polypropylene coat layer is formed as the innermost layer of an outer layer made of a laminate of aluminum foil and plastic film, and an inner layer made of a plastic laminate without aluminum foil is coated with polyethylene in the outer polypropylene coat layer. A laminate of plastic film integrally laminated with no aluminum foil is adapted to be adhesively sealed to the flange of the container, while a laminate of plastic film without aluminum foil is attached to the container. In addition to providing a cut for peeling at the part that corresponds to the flange,
A plurality of holes or cuts are provided in the open part of the container, and when the container is heated in a sealed state, the outer layer consisting of a laminate of aluminum foil and plastic film is pulled upward, and the laminate of aluminum foil is pulled upward. The inner layer consisting of a laminate of untreated plastic film is cut with a peeling cut,
A lid material for a plastic container, characterized in that the outer layer is peeled off and the lid material for a plastic container is heated while being sealed with an inner layer made of a plastic film not laminated with aluminum foil and a polyethylene layer.