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    • 7. 发明专利
    • FR2010229A1
    • 1970-02-13
    • FR6912434
    • 1969-04-21
    • KELLER PETER
    • B29C44/12B29C70/46B29C70/86E04C2/20E04B1/00
    • 1,227,668. Foam laminates; moulding plastic substances. P. KELLER. 6 June, 1969 [6 June, 1968], No. 28882/69. Headings B5A and B5N. [Also in Division E1] A synthetic resin foam is reinforced by heat- and pressure-welding thereto a web or mat of, consisting of or impregnated with, a synthetic resin solution and which has been folded concertina-wise at an edge prior to welding, whereby to reinforce the edge. The preferred reinforcement is a glass fibre mat impregnated with polystyrene solution, but may be a polystyrene web. The impregnant may be a dissolved foam polystyrene and the foam layer may also be polystyrene. The mat may be applied to the foam after partial or complete evaporation of solvent; preferably the mat is impregnated and solvent completely removed before application to the foam. The mat may be applied to both sides of the foam, or may be an interlayer between separate foam layers. Welding takes place in a heated mould, whereby shaped structures can be obtained, e.g. having a rib on one surface. The edge of the mat may be folded to a thickness greater than desired and compacted during pressing.