| 摘要 |
1318745 Wrapping-up articles DOW CHEMICAL CO 7 Aug 1970 [8 Aug 1969] 38245/70 Heading B8C A package comprises an article enclosed in a multilayer plastics sheet having a layer of selfadhering plastics material facing the article and an outer layer of non-tacky plastics material different from the first layer, the plastics sheet being in conforming contact with the article and all opposing contacting surfaces of the sheet being sealed together. In the arrangement shown, an article 5 is enclosed in a flexible multilayer container 7 having a lining layer 9 of self-adhering plastics material bonded to a shrunk layer 11 of heat-shrinkable thermoplastic organic polymer. The package is formed by inserting the article into the container which is already sealed on three sides, gradually lowering the container into hot water to expel gases therefrom and finally sealing the open end of the container. In another arrangement, Figs. 3-5 (not shown), the container is in the form of a bag within a bag, the bags being separate or attached at their edges. Each of the bags may be perforated to facilitate collapsing by evacuation of air or gas within the bag or bags. The bag openings are sealed by known means. The Specification refers to many plastics materials which may be used. Those for the outer layer include ethylene, propylene, nylon and cellophane, and those for the liner include ethylene/ vinyl acetate, and low molecular weight polypropylene. |
