Packaging bag and method for production thereof

Abstract

A packaging bag, characterized in that it comprises 2 sheets of resin film (2,2) having innermost layers (2a, 2a) made from one or more resins selected from the group consisting of a polyester, a polyamide, a polyacrylonitrile, a polycarbonate, a cyclic polyolefin and a polyfluoroethylene, the 2 sheets of resin film are arranged so that the innermost layers (2a, 2a) face each other in the inner sides thereof, and peripheral edge portions of the two resin films (2,2) are bound to each other via a peripheral edge adhesion section (3) comprising a thermoplastic resin capable of melting and adhering to the resin films (2, 2).

Description

TECHNICAL FIELD [0001] The present invention relates to a packaging bag and a method for producing the same. More specifically, the invention relates to a packaging bag which has flexibility and to which ingredients of a solution filled therein as a cotent are hardly adsorbed even when the packaging bag is used for liquid medicines, intravenous solutions and so on, and to the manufacturing method thereof. BACKGROUND ART [0002] Conventionally, as containers for preventing ingredients filled therein from adsorbing, injection molded or blow molded bottles are proposed which are made from resins that exhibit little adsorption such as cyclic polyolefins. [0003] However, such bottles are fragile due to the stiffness of cyclic polyolefins or the like. In addition, since the large amount of the resin used for making the bottles is required and the cyclic polyolefins or the like are very costly, the bottles formed from these resins become expensive. Furthermore, these bottles are not easy to...

AI Technical Summary

Benefits of technology

[0005] The object of the present invention is to solve the problems which usually non-adsorptive blow molded bottles and injection molded containers have on discarding and on utilizing because of their cost, and to provide a non-adsorptive packaging bag which is readily disposable and low-priced, as well as a method for producing the same.

Problems solved by technology

However, such bottles are fragile due to the stiffness of cyclic polyolefins or the like.

In addition, since the large amount of the resin used for making the bottles is required and the cyclic polyolefins or the like are very costly, the bottles formed from these resins become expensive.

Furthermore, these bottles are not easy to crush on account of their stiffness, and thus become so bulky that these bottles cause the problem of discarding.

On the other hand, the cyclic polyolefins or the like themselves have inferior heat sealing properties, although they can be formed into films.

This causes the problem that a large bag having high heat sealing strength and the storage capacity of 300 ml or higher can not be produced.

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