JP2544244B2 - Container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly used for packaging foods and drinks, pharmaceuticals, etc., which are required to have light-shielding properties, moisture-proof properties, gas barrier properties, aroma retention properties, storage resistance properties, etc. Containers that can be used for containers, especially retort pouches, aseptic packs, etc., and have excellent rigidity and openability [Prior art] Plastic films are used in large quantities as packaging materials, and cost, workability, and automatic packaging It is used in various packaging product fields due to its superior applicability to machines.

Aluminum foil is also used in large quantities for packaging foods, cigarettes, pharmaceuticals, toiletries, cosmetics and the like.

However, the plastic film alone and the aluminum foil alone cannot meet the demands such as the quality maintenance of the packaged products, the corrosion resistance of the packaging material, the cost, the shape retention, the sealing property, the productivity, etc. This is supported as a laminate or an aluminum vapor deposition material).

There are various types of packaging containers made from this composite material, such as bag-shaped containers and rigid containers that retain their shape. In recent years, there has been an aluminum foil in the middle, and both sides of the container are thermoplastic plastic substrates. There is a proposal of a container body consisting of (Japanese Patent Laid-Open No. 60-90130).

The container manufacturing method disclosed herein is a method in which a planar thin aluminum foil is three-dimensionally folded, the distortion (too much) generated at the time of molding is thickened in the corner portion of the container, and heat setting is performed.

The container manufactured by this method has the advantage that a relatively large aluminum foil can be manufactured even if the aluminum foil is thin, the aluminum foil has a uniform thickness throughout the container, and there is little risk of pinholes or the like being generated during processing. On the other hand, it is difficult to make a rigid one, and in order to make a rigid one, it was necessary to use the container as a preform base material and further injection-mold plastic on the surface.

Further, the lid part needs a container having a shape that is easy to open and has excellent sealing property that does not require a special tool as a rigid container.

[Problems to be Solved by the Invention] The present invention is, firstly, a problem for avoiding impairing the aesthetic appearance associated with a fold when folding an aluminum foil, which is a problem for the above-mentioned container, and second, a rigid. To manufacture a simple container, fold the aluminum foil laminated material and temporarily bond it,
It was necessary to insert this into an injection molding machine and perform injection molding, but to make the appearance smart, reduce costs by shortening the process, and develop a container that can be heated in a microwave oven. And

[Means for Solving the Problems] In order to achieve the above object, the present invention provides: (a) a container body obtained by deep-drawing a laminate comprising at least two layers in which an aluminum foil and a plastic layer are laminated by cold pressing; (B) A tab seat is provided on a preform substrate having a plastic flap portion in the periphery and a gas barrier property substrate as an intermediate layer, and a score portion and the score portion are cut at the peripheral portion of the tab seat. This is a container developed by combining a lid with a tab for

That is, the laminate used in the present invention varies in thickness depending on the rigidity of the container required for the thickness of the aluminum foil used for this and the degree of cold pressing, but as a general rule, it is thin when the degree of processing is small. Good, but when the degree of processing is high, it is necessary to make it thicker, and in order to maintain the shape that makes the plastic layer spring back, it is necessary to have a thickness of 20% or more of the plastic layer, generally 20 to 150 μm. Should be used.

As a plastic, homopolypropylene is processable,
It is the most suitable material in terms of price and heat resistance considering the case of cooking in the microwave oven after opening.

Since the adhesiveness between polypropylene and aluminum foil is low, for example, after processing aluminum foil with a titanium coupling agent or the like, a polypropylene film {casting film (CCP) is preferable with a dry lamination adhesive such as urethane. } Must be completely bonded.

By completely adhering the both, there is an advantage that the aluminum foil can be formed without problems of pinholes and cracking even when cold press forming is performed with a high degree of working such that pinholes and cracking occur.

The temperature of the cold pressing of this laminate varies slightly depending on the type of plastic used for the laminate, but in polypropylene, it can be carried out at a temperature from room temperature to about 40 ° C.

In principle, the gas barrier substrate used for the lid is an aluminum foil, but when light shielding is not required, a gas barrier resin such as a partially saponified ethylene-vinyl acetate copolymer, polyamide, or polychlorinated material is used. Vinylidene resin may be used.

Trouble can be reduced by using plastics which are used for the container body, for example, polypropylene having the same adhesiveness as polypropylene.

In order to ensure easy openness of the lid, a tab is provided on a tab seat having a score portion, and the container can be opened from the score portion by pulling up the tab.

The container can be completely sealed by welding the flap portion of the lid to the container body. After opening, it can be heated in a microwave oven.

The size of this container body can be 20cc to 500cc and can be manufactured with good productivity, but it is thought that the main size is 100cc or more considering the combination with the lid.

 Hereinafter, it will be described in more detail with reference to the drawings.

FIG. 1 is an aluminum foil-plastic laminate used for the container body 10 , 11 and 13 are plastic layers,
12 is an aluminum foil of 20 to 150 μm. Since the 11 plastic layers require corrosion resistance after filling the contents, it is preferably a film of CPP with a thickness of about 50 μm or more.
3 plastic layers to give the container rigidity 30
It can be selected from CPPs of up to 400 μm. If it exceeds 400 μm, cold plus molding becomes difficult.

The total of aluminum foil thickness and plastic film thickness
If it is 100 μm or less, the rigid property of the container body becomes weak and the practicality becomes poor.

Considering formability, rigidity and economy, aluminum foil of 100 to 140 μm and CPP of 150 to 250 μm are preferable.

Further, the plastic film can be colored with a pigment in order to make the appearance beautiful. In particular, it is possible to add titanium dioxide to eliminate the metallic luster of the aluminum foil.

This laminate is formed into a container body as shown in FIG. 2 by cold pressing. In this case, the flange portion 14 is formed, but is cut according to the width of the flap portion 25 of the lid portion.

On the other hand, the laminate used for the lid 20 may be the same as the plastic laminate of the container body as shown in FIG. 3, but the plastic layer may be thinner than that of the container body because deep drawing is not performed. In some cases, plastic layers 21 and 23 may simply be anticorrosion coats. In this case, the aluminum foil is 50 μm or less, preferably 9 to
It is about 30 μm.

Next, this laminate is squeezed and punched out to make a preform base material 24 shown in FIG. 4 (a), and a flap portion 25 is formed on it as shown in FIG. 4 (b), (c) and (d). After attaching the tab seat 26, attach the tab.

When the container body is cylindrical, a plan view of this lid is shown in FIG.
Shown in the figure. FIG. 4D corresponds to this AA sectional view. Further, FIG. 6 is a sectional view when the main body of the container and the lid portion are joined together.

The main body and the lid are sealed with a high-frequency sealer after filling the contents.

[Examples] Hereinafter, the present invention will be described more in detail.

Laminate CPP (50 μm) / Urethane dry adhesive (5 g / m ² ) / Aluminum foil (100 μm) / Urethane dry adhesive (5 g / m ² ) / CPP (200 μm) at room temperature from the side in contact with the contents Pressing was performed using a mold set with a wrinkle retainer and a male and female mold with a cutting edge to create a 113cc container body.

On the other hand, urethane dry adhesive is applied to both sides of the aluminum foil 11 μm with CPP (20 μm) on the front side and CPP (60 μm) on the inside.
Was laminated and was drawn and punched to form a preform base material, and as shown in FIG. 4, a flap part, a tab seat, and a tab were attached to form a lid part.

After putting 100 cc of water in the container body, heat welding was performed to prepare a sealed container.

The sealing condition is the voltage when polypropylene is used.
It is sufficient that the current is 80 V, the current is 37 A, and the pressure on the adhesive surface is 1.4 kg / cm ² for 2 seconds.

When 20 samples of this sample were naturally dropped from a height of 3 m, the container was not deformed and the contents did not leak.

[Operations and Effects] The container body of the present invention can be molded from an aluminum foil-plastic laminate by a single cold pressing process, and has extremely excellent productivity. The lid also has high productivity by combining with injection molding.

This container is a container that can be completely sealed by filling the contents of the container with a cover and heat-sealing it, and can be used in a microwave oven.

Since it uses a laminate of plastic and aluminum foil, it has excellent sealing properties, moisture resistance, corrosion resistance, and contamination resistance against microorganisms and dust, which are the most important packaging materials, and is required as a food and drink packaging material. It also has applicability to automatic packaging machines, gas barrier properties, aroma retaining properties, and light shielding properties. Further, since the container of the present invention is composed of the specified container body and lid, it also has a rigid property and an easy open property, and can be used as a container for packaging foods and drinks, pharmaceuticals, cosmetics and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a laminate which is a material of a container body, FIG. 2 is a sectional view of a container body, FIG. 3 is a sectional view of a laminate which is a material of a lid body, and FIGS. 4 (a) to 4 (d). Is a cross-sectional view of an embodiment for manufacturing a lid from a laminate of materials, FIG. 5 is a plan view of the lid, and FIG. 6 is a cross-sectional view of a container in which a container body and a lid are combined. 10 : Container body, 11: Plastic layer 12: Aluminum foil, 13: Plastic layer 14: Flange layer, 20 : Lid 21: Plastic layer 22: Gas barrier base material 23: Plastic layer, 24: Preform base material 25 : Flap part, 26: Tab seat 27: Tab, 29: Score part

Claims (3)

(57) [Claims] 1. A container body formed by deep-drawing a laminate comprising at least two layers in which an aluminum foil and a plastic layer are laminated by a cold press, and (b) having a plastic flap portion around a gas barrier property. A container in which a tab seat is provided on a preform base material composed of a laminate having a base material as an intermediate layer, and a lid body in which a score portion and a tab for cutting the score portion are provided on a peripheral portion of the tab seat is combined. 2. The container according to claim 1, which is a lid body obtained by injection-molding a flap portion on a preform substrate and then taking a tab. 3. The laminate aluminum foil of the container body has a thickness of at least 20% of the thickness of the plastic layer, and the total thickness of the aluminum foil and the plastic layer is at least 100 μm. Item 1 container.