JPH0618909Y2 - Cylindrical container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a container made of a high nitrile resin. More specifically, the present invention relates to a cylindrical container having excellent storage stability after opening.

[Prior Art] In order to improve the storability of various foods, a packaging material having an excellent gas barrier property is used to contain an oxygen scavenger or perform gas replacement and hermetically seal.

There are various shapes of containers such as trays, cups, and bottles. In a cylindrical container, a pressure difference between the inside and the outside of the package occurs due to temperature changes during use of the oxygen absorber or after storage after packaging, and during transportation, etc., causing the container to deform and the contents to deform and the product design to be inferior. Therefore, increasing the thickness of the container,
Although methods such as reinforcement with ribs have been taken, increasing the thickness of the container increases the cost, and if the ribs are added, it becomes difficult to label the container. As an improved method, the present applicant has proposed the idea of providing a flexible tubular film at one or both ends of the container.
(Practical application No. 63-14736) [Problems to be solved by the invention] However, since the tubular film is cut when opening,
After opening, the problem that the gas barrier property of the container is lost and the storability of the contents is deteriorated has not been solved.

It is an object of the present invention to provide a tubular container which is free from the drawbacks of the conventional tubular container having a gas barrier property and has excellent storability even after opening.

[Means for Solving the Problems]

The present inventors diligently studied to solve such a problem,
We have found that these problems can be solved all at once by attaching fasteners to the flexible film at one or both ends of a cylindrical container made of high nitrile resin, which has excellent rigidity and gas barrier properties, and finally completed the present invention. did.

That is, the present invention provides a conjugated diene-based synthesis of a mixture of acrylonitrile monomer content of 50% by weight or more and a large amount of acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer. A tubular container made of a high nitrile resin produced by polymerization in the presence of rubber, which has flexibility at one or both ends and a tubular film having excellent gas barrier properties. A tubular container characterized in that it has a fastener at an end of a strip-shaped film.

The high nitrile resin used in the present invention is a copolymer mainly composed of unsaturated nitrile monomers such as acrylonitrile and methacrylonitrile, and the unsaturated nitrile monomer content is 50% by weight or more, preferably 55%. It contains more than weight%.

As the monomer copolymerizable with the unsaturated nitrile monomer,
Examples include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, and the like, one or more of which is copolymerized with an unsaturated nitrile monomer.

Further, as the high nitrile resin, butadiene-acrylonitrile copolymer, isoprene-acrylonitrile copolymer, butadiene-styrene copolymer, polybutadiene, a mixture of the rubber-like polymer such as polyisoprene and the above copolymer, and these It is also possible to use those obtained by graft-bonding the unsaturated nitrile monomer and the above-mentioned copolymerizable monomer in the presence of the rubber-like polymer. In particular, the content of acrylonitrile monomer is 50 wt% or more, and a mixture of a large amount of acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer, the presence of conjugated diene-based synthetic rubber The resin produced by polymerization below is preferable because it has a good balance of gas barrier properties, rigidity, processability, impact resistance and the like.

The container of the present invention can be formed by vacuum molding, pressure molding, or blow molding, injection molding a sheet obtained by subjecting the above resin to a usual extrusion molding method, calender molding method, inflation molding method, or the like. Separately manufactured with a container body obtained by winding a metal bottom lid around one end of a tubular body obtained by cutting the sheet into a required size and heat-sealing it, for example. It is excellent in flexibility and gas barrier property and is manufactured by adhering to a tubular film having a fastener. In the above description, the term “cylindrical” means not only a circular shape but also various shapes such as a triangle and a square.

The thickness of the container body of the present invention varies depending on the internal capacity, required strength, etc., but is usually 100 to 1000 μm, and if it is less than 100 μm, the rigidity of the container is insufficient, which is not preferable. On the other hand, it may be over 1000 μm, but this will result in poor workability and increase in cost.

The tubular film having a fastener having excellent flexibility and gas barrier properties used for the container end portion of the present invention is a single layer film of high nitrile resin having high gas barrier property, or polypropylene, polyethylene, polyester,
A multilayer film obtained by laminating the above monolayer film on a film such as nylon is preferable, and polyamide, ethylene-vinyl alcohol copolymer, or a resin film obtained by laminating metal vapor deposition or metal foil is used as a gas barrier layer. Multilayer films can also be used.

In the present invention, as a method of adhering the container body and the end film, a normal adhesive, a double-sided adhesive tape, a heat sealing method,
There is a high-frequency sealing method.

In the container of the present invention, an object to be packaged such as food and an oxygen scavenger are stored, and the film portion at the end is sealed by a usual heat sealing method, impulse sealing method or the like.

〔Example〕

 Hereinafter, an example of the container of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a case where a tubular film 2 having a fastener portion 6 is adhered to one end of a container body 1 obtained by thermoforming a high nitrile resin sheet and sealed by a seal portion 3. It is a perspective view of a cylindrical container. A rib 4 for accommodating an oxygen absorber or the like may be provided on the bottom of the container, if necessary.

FIG. 2 shows that a tubular film 2 having a fastener portion 6 is adhered to one end of a container body 1 obtained by injection molding a high nitrile resin, a tubular film 7 is adhered to one end thereof, and a sealing portion is used. 3 is a perspective view of the cylindrical container of the present invention when it is sealed in FIG.

FIG. 3 shows a tubular body having a tubular body 1 obtained by cutting and heat-sealing a high nitrile resin sheet, with a metallic bottom cover 5 wound around one end and a fastener portion 6 at the other end. It is a perspective view of the cylindrical container of this invention when the film 2 is adhere | attached and sealed by the seal part 3. FIG.

[Effect of device]

The container of the present invention is made of a high nitrile graft resin obtained by polymerizing a monomer mixture containing 50% by weight or more of acrylonitrile monomer in the presence of a conjugated diene-based synthetic rubber. It is a cylindrical container that has a good balance of properties, rigidity, processability, impact resistance, etc., and is excellent in storability even after opening. It is a great contribution to the distribution and sale of various foods.

[Brief description of drawings]

FIG. 1, FIG. 2 and FIG. 3 are perspective views showing an example of a cylindrical container according to the present invention. In the figure, 1 is a body of a container, 2 is a tubular film having a fastener, 3 is a sealing part, 4 is a rib, 5 is a bottom lid, and 6
Is a fastener and 7 is a tubular film.

Claims (1)

[Scope of utility model registration request] 1. A conjugated diene synthetic rubber containing a mixture of an acrylonitrile monomer content of 50% by weight or more and a large amount of an acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer. A tubular container made of a high nitrile resin produced by polymerization in the presence of a tubular container made of a tubular film having flexibility at one or both ends and having excellent gas barrier properties. A tubular container having a fastener at an end of a film.