| 摘要 |
1,052,860. Preserving vegetables. ARMOUR & CO. Nov. 24, 1965 [Nov. 24, 1964], No. 49967/65. Heading A2D. [Also in Divisions B5 and C3] Boilable and/or shrinkable plastics pouches for packaging vegetables are made by applying to an inert plastics film an adhesive composition comprising a thermoplastic copolymer selected from vinyl acetate-ethylene copolymers, vinyl acrylate-ethylene copolymers and vinyl acetate-propylene copolymers, an ester of pentaerythritol or glycerol with a rosin, terpene, polyterpene or dimerized resin acid, wax and a solvent, drying, and then heat sealing the coated film to itself or to another substrate. The films may be of a polyfluoro-carbon, a polyolefine, a polyamide, a polyester, polyvinylidene or polyvinyl chloride. In the example an adhesive composition comprising a vinyl acetateethylene copolymer, an ester of pentaerythritol and hydrogenated rosin, paraffin wax and toluene is applied to one face each of two sheets of polyfluoro-chloroalkyl plastic film. The sheets are then placed upon each other with the coated surfaces innermost and three of the edges are heat sealed to form an open ended pouch. A vegetable item is inserted into the pouch and the fourth edge heat sealed. The vegetable containinng package may be quick frozen and subsequently immersed in boiling water without damaging the heat seals or the plastics film. |
