| 摘要 |
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.
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