JPH04109069U - heat seal containers - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To provide a heat-sealed container equipped with a lid that is easy to open and seal, and has a rigidity that allows it to be put back on the container even after opening. [Structure] A container body 10 having flange parts 5, 13 on the outer periphery of the opening and at least the surfaces of the flange parts 5, 13 made of heat-sealable resin, and a lid having at least the inner surface made of heat-sealable resin. This is a container formed by heat-sealing the materials at the flange portions 5 and 13, and the lid material includes an outer layer 1 made of biaxially oriented ethylene-vinyl alcohol copolymer, an intermediate layer 2 made of vinyl chloride resin, and a heat-sealed material. It consists of a laminate of an inner layer 3 made of a synthetic resin, and the laminate has an outer layer 1 of 10 to 30 μm and an intermediate layer 2 of 100 μm.
from 15 to 500 μm, and from 15 to 100 μm for inner layer 3
It is in the range of m.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a heat-sealable container, and more specifically, to ease of opening and sealing. Excellent rigidity that allows it to be put back on the container without deforming even after opening. The present invention relates to a heat seal container with a lid.

0002

[Conventional technology]

Traditionally, containers made of thermoplastics such as polypropylene have been used. The container body and the lid body, which has a heat-sealable resin layer on a base material such as metal foil, are attached to the container body. Heat sealing is performed between the thermoplastic resin surface of the body and the heat-sealable resin layer of the lid. Easy-to-open heat-sealed containers are known, and these packaging containers are suitable for food products. Widely used in fields such as packaging.

0003

[Problem that the idea aims to solve]

However, these heat-sealed containers lack ease of opening and sealing. However, to make it easier to open, I decided to use a flexible laminate for the lid. Because of this, the lid body itself has the disadvantage of low rigidity and poor shape retention. . In other words, the lid with this structure may curl after opening. If a lid is removed from a container because it is unable to maintain its unopened condition, it may be returned to the container. There was an inconvenience that it could not be used as a cover.

0004 Therefore, the purpose of this invention is to provide excellent sealing and unsealing properties, as well as to provide a product that remains unsealed even after opening. Heat-sealed with a rigid lid that can be used as a lid. The goal is to provide a container. Another purpose of the present invention is to thermoform with high dimensional accuracy. The lid is heat-sealed and has excellent oxygen barrier properties. The goal is to provide a container.

[0005]

[Means to solve the problem] The present invention was proposed to achieve the above-mentioned object, and is particularly applicable to heat shields. It is characterized by using a specific laminate as the lid material for the roll container. That is, according to the present invention, a flange portion is provided on the outer periphery of the opening, and at least a flange portion is provided on the outer periphery of the opening. A container body whose surface is made of heat-sealable resin, and at least an inner surface The lid material whose surface is made of heat-sealable resin is heat-sealed at the flange. The lid material is made of biaxially oriented ethylene-vinyl alcohol copolymer. A stack of a composite outer layer, a vinyl chloride resin middle layer, and a heat-sealable resin inner layer. consisting of a layered body, and the layered body has an outer layer of 10 to 30 μm and an intermediate layer of less than 100 μm. 500 μm, and the inner layer is in the range of 15 to 100 μm. A heat seal container is provided.

[0006] In the present invention, the heat-sealing resin is a polyolefin resin and an ethythmyl resin. It is preferably made of a blend of vinyl-vinyl acetate copolymer, and the inside of the lid is By vacuum forming a convex part in the center that protrudes toward the outside of the container, the contents This makes it possible to store preservatives and the like to improve the shelf life of the product.

[0007]

[Effect]

In the present invention, the lid is made of biaxially stretched film as the outer layer 1, as shown in Figure 1. vinyl-vinyl alcohol copolymer, vinyl chloride resin as the intermediate layer 2, and Layer 3 consists of a laminate made of heat-sealable resin, and the laminate is the outer layer. is 10 to 30 μm, the middle layer is 100 to 500 μm, and the inner layer is 15 μm. An important feature is that it has a layer structure with a thickness of 100 μm.

[0008] That is, the biaxially oriented ethylene-vinyl alcohol copolymer used as the outer layer. has high tensile elongation at break and tear strength, low Young's modulus, and dimensional shrinkage when heated. It has the characteristics of a small amount of oxygen permeation and a small amount of oxygen permeation. Due to these characteristics, the lid can be thermoformed, and when creating irregularities, it is possible to make rounded corners etc. It can be formed with a clean texture and has excellent dimensional accuracy, so it has added rigidity. This makes it possible to create a level difference that can be applied.

[0009] In addition, the present invention uses a relatively thick hard vinyl chloride resin for the intermediate layer. This provides rigidity that prevents the lid from curling even after opening. Also, Vinyl chloride resin is inexpensive and has excellent economic efficiency, and has low oxygen permeation rate and heat resistance. It has the advantage of being suitable for molding.

0010 Furthermore, as a heat-sealing resin, the flange of the container to be heat-sealed is Adhesives such as ethylene-vinyl acetate copolymer or polyisobutylene are added to the same type of resin. Heat that satisfies easy-opening and sealing properties by using a blended product. It becomes possible to obtain seal strength.

[0011] In the present invention, in the above layer structure, the outer layer has a thickness of 10 to 30 μm, particularly 12 μm. from 100 to 20 μm, with an intermediate layer of 100 to 500 μm, especially from 150 to 350 μm m, and the inner layer is in the range from 15 to 100 μm, in particular from 20 to 70 μm. This is important in order to express the characteristics of each of the above resins as a laminate. in this range This provides sufficient strength and dimensional stability for thermoforming, and Even after opening, the lid can be re-attached and has sufficient rigidity to be used as a lid. become something that

0012

[Specific explanation of the idea]

Hereinafter, the heat seal container of the present invention will be specifically explained. (lid body) In "Fig. 2" which shows a cross-sectional view of an example of the lid, the lid 4 remains on the container even after opening. The flange part 5 corresponding to the container flange part is dropped into the inside of the container. A recessed portion 6 is formed with a stepped portion 7 interposed therebetween. This stepped portion 7 is formed. This allows the lid to be easily removed even if the lid is not tightly fitted to the container. It can prevent it from falling.

[0013] In addition, a convex portion 8 is formed in the center of the concave portion 6 of the lid, and protrudes toward the outside of the container. Various preservatives, such as oxygen scavengers and silica gel, are stored in the convex portion 8 to preserve the contents. Preservability can be improved.

[0014] As mentioned above, the lid is used as a cover even after opening, so it does not curl even after opening. It requires rigidity that will never deteriorate. In this invention, the laminate alone has sufficient rigidity. However, the supplement shown in FIG. 3, which is a plan view of another example of the lid of the present invention, can be obtained. By providing the stepped portion 9 for strength, even higher rigidity can be obtained.

[0015] The biaxially oriented ethylene-vinyl alcohol copolymer used for the outer layer contains ethylene. Preferably, the amount is in the range of 25 to 50 mol%, and generally Biaxially stretched products sold under trade names can be preferably used. The vinyl chloride resin used for the intermediate layer is not only a vinyl chloride homopolymer, but also Copolymers of vinyl chloride with other monomers, such as vinyl chloride and vinegar Vinyl acid, vinylidene chloride, acrylic ester, acrylonitrile, propylene It is possible to use copolymers such as A homopolymer of vinyl chloride is preferably used. The heat-sealing resin used for the inner layer is the material of the part of the container body that should be heat-sealed. Although it depends on the quality, ethylene-vinyl acetate copolymer is generally added to polyolefin resin. Those containing a tackifier such as or polyisobutylene can be suitably used. polio Examples of olefin resins include polypropylene and linear low density polyethylene (LLDP). A blend of E) can be preferably used.

[0016] This laminate can be obtained by coextruding each resin. It can also be obtained by gluing films or sheets together. The laminate having the above-mentioned layer structure is processed by known methods such as vacuum forming, pressure forming, and press forming. However, in this invention, vacuum forming is particularly preferred. Accordingly, it can be easily molded into the shapes shown in "FIG. 2" and "FIG. 3."

[0017] When printing on the lid of the present invention, the outer layer of biaxially oriented ethylene-vinyl aluminum Gravure printing is done on the back side of the coal copolymer film, that is, on the middle layer side. It is possible to provide clearer images with less printing bleed.

[0018] (container body) The container body 10, an example of which is shown in FIG. 4 in combination with the lid, is made of thermoplastic resin. For example, vacuum forming, pressure forming, press forming, plug-assist Formed into a seamless one-piece structure by drawing using methods such as stretch forming and stretch forming. and a circumferential side wall portion 11, a bottom portion 12 continuous to the lower end of this circumferential side wall portion 11, and a side wall. It consists of a heat-sealing flange part 13 continuous to the upper end of the part.

[0019] The container body is made of a multilayer structure containing heat sealing resin and gas barrier resin. A specific example of this is a heat-sealing material that has heat-sealability and moisture resistance. Plastic resins, such as polyethylene, polypropylene, and ethylene-propylene Polyolefins such as polymers, polyethylene terephthalate, polybutylene terephthalate, Inner surface layer and outer surface layer made of thermoplastic polyester such as phthalate, and gas Sub-barrier thermoplastic resins, such as ethylene-vinyl alcohol copolymers, salts Equipped with an intermediate layer made of vinylidene chloride resin, high nitrile resin, and nylon resin. These inner and outer surface layers and the intermediate layer are made of a resin that exhibits thermal adhesive properties. For example, acid-modified olefin resin, copolyester adhesive resin, epoxy-modified heat They may be joined via an adhesive layer made of plastic resin or the like. Also, the inner and outer layers and the middle It is also possible to use scraps produced during container molding between the interlayer and the interlayer.

[0020]

[Effect of the idea]

According to the present invention, the lid body is made of a biaxially oriented ethylene-vinyl alcohol copolymer. layer, an intermediate layer of vinyl chloride resin, and an inner layer of heat-sealable resin. and each layer of the laminate has an outer layer of 10 to 30 μm and an intermediate layer of less than 100 μm. Since the inner layer is in the range of 500 μm and the inner layer is in the range of 15 to 100 μm, it is easy to open. Excellent sealing and sealing properties, and rigidity that allows the container to be covered again even after opening. It has now become possible to obtain a heat-sealed container with a lid having . Also, this invention The heat seal container has excellent oxygen barrier properties and has a convex part in the center of the lid. This allows storage of oxygen absorbers, etc., which prevents acid from being affected by oxygen in miso, wasabi pickles, etc. Especially suitable for storing items that are easily destroyed.

[0021]

【Example】

The present invention will be explained below with reference to Examples. Biaxially oriented ethylene-vinyl alcohol with a thickness of 15 μm and an ethylene content of 32 mol% copolymer film and a polyvinyl chloride (PVC) sheet with a thickness of 300 μm. Dry lamination was performed using a urethane adhesive to obtain a laminated sheet. Next, a layer of ethylene-propylene with a thickness of 50 μm was placed on the PVC layer side of the laminated sheet. Copolymer 50: Ethylene-vinyl acetate copolymer 30: Linear low density polyethylene Dry laminate a sealant layer containing 20 and a small amount of polyisobutylene adhesive. I did it. The laminated sheet thus obtained is vacuum formed to form a medium as shown in Figures 1 to 3. A lid body with a convex portion formed in the center was obtained. On the other hand, the inner and outer layers are polypropylene, and the middle layer is ethylene-vinyl alcohol. Each layer is laminated with an adhesive layer of modified propylene resin. A cup-shaped container of three types and five layers is filled with contents, and an oxygen absorber is stored in the convex portion. The lid body was heat sealed. In this way, a container filled with contents and sealed has excellent sealing performance, and It can be opened easily, and the lid can be left intact after opening. It retained its shape and could be used as a lid for a container.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a laminate used for a lid of a heat-sealed container according to the present invention.

FIG. 2 is a sectional view showing an example of the lid of the heat seal container of the present invention.

FIG. 3 is a plan view showing another example of the lid of the heat seal container of the present invention.

FIG. 4 is a cross-sectional view showing an example of the heat seal container of the present invention.

[Explanation of sign]

1 Outer layer 2 Middle class 3 Inner layer 4 Lid body 5 Flange part 6 Recess 7 Step part 8 Convex part 9 Step part 10 Container body 11 Circumferential side wall 12 Bottom 13 Flange part

Claims (3)

[Scope of utility model registration request] 1. A container body having a flange portion on the outer periphery of the opening and having at least the surface of the flange portion made of a heat-sealable resin, and a lid member having at least an inner surface made of a heat-sealable resin. In a container heat-sealed at the flange, the lid material is composed of a laminate of an outer layer of biaxially oriented ethylene-vinyl alcohol copolymer, an intermediate layer of vinyl chloride resin, and an inner layer of heat-sealable resin, and The outer layer of the laminate has a thickness of 10 to 30μ.
m, the middle layer is 100 to 500 μm, and the inner layer is 1
A heat-sealable container characterized in that the thickness is in the range of 5 to 100 μm. 2. The heat-sealable container according to claim 1, wherein the heat-sealable resin comprises a blend of a polyolefin resin and an ethylene-vinyl acetate copolymer. 3. The heat-sealed container according to claim 1, wherein a convex portion projecting toward the outside of the container is provided at the center of the lid by vacuum forming.