| 摘要 |
1276634 Metal foil-plastics laminates NITTO ELECTRIC INDUSTRIAL CO Ltd 3 Dec 1970 [5 Dec 1969 9 May 1970] 57538/70 Headings B5B and B5N [Also in Division H1] A laminate comprises a metal foil, e.g. of aluminium, copper, iron, steel, silver, gold or tin, having laminated thereto a composite layer comprising a first layer in contact with the metal foil comprising ethylene-vinyl acetate copolymer containing 10-45% by weight of vinyl acetate and a second layer welded to the first layer comprising polyethylene or ethylenevinylacetate copolymer containing not more than 8% by weight of vinyl acetate. The laminate may be produced by extruding a stream of polyethylene or ethylene-vinyl acetate copolymer containing not more than 8% by weight of vinyl acetate and a stream of ethylene-vinyl acetate copolymer containing 10-45% by weight of vinyl acetate from the respective outputs of two extruders, feeding the streams to an inflation die, thermally welding together the two streams before or after the exit of the die to form a composite layer and pressing the composite layer on to a metal foil at an elevated temperature such that the latter copolymer is in contact with the foil. The composite layer may be extruded as a tube and cut to form a sheet or the tip ends of the two extruders may be connected to a single T-die. One or both surfaces of the composite layer may be subjected to treatment to improve its adhesive properties, e.g. by corona discharge. The laminate may be used as a shielding layer for a communication cable, the laminate being disposed around an aggregated core covered with a bundling tape of polyester or polyethylene film and an outer jacket of polyethylene being disposed on the outer surface of the plastics layer of the laminate. |
