| 摘要 |
1,135,483. Foam core laminates. IMPERIAL CHEMICAL INDUSTRIES Ltd. 8 May, 1967 [17 May, 1966], No. 21816/66. Heading B5N. A method of making a laminate having a core of foamed plastics material 9 sandwiched between and bonded to two outer facing materials 6 and 7, comprises providing two co-operating substantially parallel conveying surfaces 1 and 2 forming within supporting platens 3 and 4 an extended longitudinal nip 5, one of said platens being movable on a vertical plane relative to the other, continuously maintaining said platens substantially parallel to each other and at a substantially constant distance apart by feedback control means, feeding a facing material into contact with each conveying surface, supplying to at least one of the facing materials, anterior to the nip, a foam-forming reactional mixture, continuously sensing the thrust of the foam against at least one of the platens by continuously measuring the fluid pressure required to maintain the platens in said constant positions, controlling the rate of lay-down of the foam-forming mixture per unit area of facing material so as to maintain the thrust within desired limits, and removing the laminate from the nip. An apparatus for effecting the process is described and claimed. The specified plastics material is polyurethane. |
