Method of making rigid packages from flexible films and products produced thereby
专利汇可以提供Method of making rigid packages from flexible films and products produced thereby专利检索，专利查询，专利分析的服务。并且The method of forming a package from a flexible film containing a plasticizer or other constituent which is capable of being polymerized upon being irradiated from a high energy source. After enclosing a product in such a packaging film, the thus formed package is subjected to a controlled amount of irradiation from a high energy source to produce cross-linking within the plasticizer or other constituent which results in the flexible packaging film becoming rigid. An electron accelerator, such as, for example, a high voltage Van de Graaff machine, may be used for this purpose. Other suitable irradiation sources include radioactive elements such as Cobalt 60, X-ray devices, corona discharge apparatus and ultraviolet emitters. In order to avoid discoloration of such films, it is preferred that the amount of irradiation not exceed 5 megarads. In one embodiment of the present invention, a packaging film lamination is formed by extruding a polyvinylidene chloride film and polyvinyl chloride film which, upon being extruded, are immediately received in a supercooling water bath maintained at a temperature of from approximately 30* F. to 100* F. One or both of these film contains an amount of polymerizable plasticizer ranging from approximately 10 percent to 50 percent by weight based on the combined weight of the film forming resin and plasticizer present therein. These films are then pressed together through contacting rollers to form a film lamination. A product to be packaged is then interposed between the film lamination and a base member, which can be a flexible film or rigid material. Peripheral portions of the film lamination are then contacted with said base member to completely enclose the product and crystallization of the polyvinylidene lamina then induced as, for example, by the application of heat. The package is then irradiated in accordance with this invention to rigidify the film lamination.，下面是Method of making rigid packages from flexible films and products produced thereby专利的具体信息内容。
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