JPS62135154A - Multilayer plastic vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] This invention relates to a multilayer plastic container for packaging foods and other articles.

[Prior Art] Multilayer Plus Deck containers use materials that make up the body.
The surface layer material and the middle layer material are made of a multilayer plastic made of different materials, and the middle layer material has contents resistance,
By using materials with excellent barrier properties, it is superior to metal containers in terms of resource savings, low cost, and ease of handling.
Moreover, it was devised to overcome the weaknesses of plastic containers in terms of resistance to contents and barrier properties.

[Problems to be Solved by the Invention] However, multilayer plastics have a weakness in that when they are bent, the integrity between layers of different constituent materials deteriorates, causing the parts to separate into their respective constituent single layers and peeling off. .

For this reason, the container body is made of multilayer plastic,
When a lid made of metal or the like is tightened around the opening end, the part bent to the outside of the container due to tightening will separate into a single layer, causing incomplete tightening, resulting in so-called delamination, which will reduce the shelf life of the contents. There was a problem that it could deteriorate.

This invention was made in view of the above circumstances, and has the advantages of multilayer plastic containers such as resource saving, low cost, and ease of handling, as well as content resistance and barrier properties close to those of metal containers. It is an object of the present invention to provide a multilayer plastic container that does not cause delamination in the seam portion and deteriorate the storage stability of the contents.

(b) Structure of the invention [Means for solving the problem] In response to this object, the multilayer plastic container of the present invention has a container body having a multilayer plastic container body consisting of a surface layer material and an intermediate layer material. , the opening end of the container body is wound and tightened, and the opening end does not include an intermediate layer material in the bent portion caused by the tightening.

Hereinafter, details of the present invention will be explained with reference to the drawings showing one embodiment.

In FIG. 1, 1 is a multilayer plastic container. The multilayer plastic container 1 is made by double-sealing a ductile metal lid 3 to the open end of a container body 2.

The container body 2 has a surface layer material 4 such as polyester, and an intermediate layer material 5 such as EVAL (ethylene vinyl acetate copolymer),
It is formed by stretch blow molding of a multilayer plastic preform using U polymer (bolyarylate), MX nylon (aromatic polyamide), etc., and the width of the open end of the preform is bent by double seaming. Bending part 6 of d
has a single layer of surface layer material 4 without the intermediate layer material 5, and the bent portion 6 gradually becomes thinner than the body wall thickness toward the tip.

On the other hand, the extensible metal lid 3 consists of a top plate part 7 that closes the open end of the container 112, and a seam part 8 that is the outer periphery of the top plate part 7. The seaming part 8 includes an inner part 8a that stands up almost vertically from the top plate part 7 and is located along the inner wall of the container ll112, and an upper end part 8b that continues from the inner part 8a and forms the upper end of the multilayer plastic container 1. Subsequently, an outer portion 8C that hangs down on the outside of the container body 2 and forms the outer surface of the seaming portion 8;
It consists of a core valve 8d that rises again along the outer wall of the container body 2 following the outer portion 8C.

The container 11i12, which is sandwiched between the inner part 8a and the core valve 8d, contains the intermediate layer material 5 up to an intermediate position in the height direction, and beyond that, a single layer of the surface layer material 4 is formed, which continues to the folded part 6. . This single-layer portion is wound so that its inner surface is in contact with the inner portion 8a, upper end portion 8b, and outer portion 8C, and its outer surface is in contact with the core valve 8d.

[Operations/Effects] The multilayer plastic container 1 configured as described above is superior to metal containers in resource saving, low cost, and ease of handling. Also, the inside of the container is either the multi-layered part of the container body 2 or the metal lid 3.
Because it is separated from the outside of the container by
Excellent barrier properties.

Further, since the folded portion 6 for seaming does not contain an intermediate layer material and is a single layer, no delamination occurs and the storage stability of the contents does not deteriorate. Further, since the folded portion 6 gradually becomes thinner, it is easy to tighten the folded portion 6.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional end view showing the seaming part of a multilayer plastic container according to an embodiment of the present invention, and FIG. 2 is a cross-sectional end view showing the container body and lid of the multilayer plastic snack container shown in FIG. be. 1...Multilayer plastic container 2...Container body
3... Expandable metal lid 4... Surface material 5...
Intermediate layer material 6...Bending part 7...Top plate part
8... Sealing part 8a... Inner part 8b... Upper end part 8C... Outer part 8d... Core valve patent applicant Toyo Seikan Co., Ltd. agent
Osamu Kawai Sword Illustration 2

Claims (1)

[Claims] It consists of a container body having a multilayer plastic container body made of a surface layer material and an intermediate layer material, and a lid that is wrapped around the open end of the container body, and the open end is bent at the folded part by the seaming. A multilayer plastic container characterized by not containing an intermediate layer material.