| 摘要 |
<p>1380307 Laminating foam materials KOEPP AG 16 Feb 1972 [19 Feb 1971] 7097/72 Heading B5N [Also in Division B2] Foamed materials, e.g. polyurethane foam sheets, are laminated to sheet materials by heating a surface of the foam to soften it to an extent insufficient for permanent bonding, uniting the softened surface with a foil of melt adhesive melting the foil and contacting the sheet material with the melt. The process may be carried out continuously and the intermediate product may be stored. Lamination to both sides of the foam may take place. The heating and melting stages may be carried out by flame, hot gas, infra-red radiation or heated roller, and the product may be cooled after each stage. The adhesive is preferably polyethylene or polypropylene, but may also be polyamide or a homopolymer or copolymer of styrene, vinyl chloride or vinyl acetate; if the foil is not'self-supporting (e.g. polyvinyl acetate foils) it may be supported on a paper, cellulose or plastics release layer which is removed after the adhesive has contacted the softened foam. The adhesive foil may be sufficiently thin (e.g. 10-50 microns) to enable the product to " breathe ". The sheet material may be woven or knitted fabric (e.g. knitted acrylic fabric), fleece, carpenting (e.g. polyethylene base-acrylic fibres), textile velour or plastics web or foil (including foamed plastics).</p> |
