Packaging material comprising a water-soluble film

Details Packaging material comprising a water-soluble film Packaging material comprising a water-soluble film

1996-12-13

1998-10-27

Nold, Charles

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 343, 428 353, 428 354, 428 359, 428 57, 383 1, 383 37, 383210, 383107, 383109, 383113, 2065241, 2065242, 2065245, 2065247, B65D 6546

Patent

active

058275860

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a container for use in dividingly packaging chemical preparations, particularly pesticide preparations, and to a film for forming said container.
A chemical preparation such as pesticide preparation has so far been made into an article by directly filling a container with the preparation and packaging the container, whether the preparation is a solid or a liquid. Otherwise, an article has been made by packing a preparation in an inner bag made of water-soluble film and further packaging the inner bag thus obtained into a prior type of direct packaging container to form a double package.
If a pesticide having been packed in an inner bag made of water-soluble film is further packaged in an outer packaging container in the form of double package, however, the process of packaging involves two steps, namely the first step for dividingly packing the pesticide into inner bags and the second step for introducing and packaging one or more inner bags into one outer bag, and such a process is not economical from the viewpoint of working efficiency. Further, since the process involves the two packaging steps, two kinds of packaging machines are necessary, namely the first packaging machine for packing a pesticide into inner bags on the one hand and the second packaging machine for sealing the outer bags on the other hand. A packaging work using a water-soluble film has to be carried out in an appropriately air-conditioned environment because the water-soluble film is susceptible to the influence of atmospheric conditions such as humidity, temperature, etc. The insertion of inner bags into the outer bag must be carried out manually because the inner bags are soft in nature and leakage of content from inner bags must be prevented carefully, and such a manual operation makes automation of the inserting work quite difficult.
Further, in a double package, the inner bags are liberated from the protective outer bag and therefore cannot sufficiently be protected from the shocks which may be applied to the inner bags in the course of transportation in spite of the protective function of the outer bag. Thus, as an disadvantage, breakage of inner bags can take place.
The aim of the present invention is to solve the above-mentioned problems in the prior packaging containers for chemical preparations.
One object of the present invention provides a packaging container capable of exhibiting the same function and effect as in the prior double package type of packaging container including water-soluble inner bags, which can be produced by using the same packaging materials as in the prior direct packing type of containers for chemical preparations in only one step of packaging process.
Another object of the present invention consists in providing a packaging bag wherein the dislocation of inner bags in the outer bag is prevented and the outer bag can sufficiently function as a protective bag.
A further object of the invention consists in providing a packaging film for forming the above-described packaging bag.
The packaging container for chemical preparations according to the present invention is a container formed by sealing multi-layer films each constituted of a water-soluble polymer film and at least one layer of water-insoluble film, wherein the inner layer of the container is constituted of a water-soluble polymer film, the outer layer of the container is constituted of a water-insoluble film, and at least in the seal part, water-soluble polymer films of the inner layer are bonded to each other, a water-soluble polymer film of the inner layer and a water-insoluble film of the outer layer are bonded to each other, and the water-soluble polymer films and water-insoluble films are readily releasable from one another.
According to the invention, the multi-layer film for forming a packaging container for chemical preparations may be a product prepared by simply superposing a water-soluble polymer film and a water-insoluble film. A bag-form container is made therefrom by sealing the films so that the

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