| 摘要 |
970,932. Laminates and laminating. OWENS-CORNING FIBERGLASS CORPORATION. Oct. 3, 1960 [Oct. 2, 1959], No. 21930/64. Divided out of 970,931. Heading B5N. A porous web is provided with a surface film of a synthetic thermoplastic polymer by first disposing the film in contact with a surface of the web, heating the film to soften it, drawing the film into intimate contact with the web surface by applying suction to the other surface of the web, and cooling the film whilst maintaining suction. The web may be a board or sheet or a loose aggregate of material disposed to form a layer, preferred materials being fibrous glass or open-celled foamed plastics. The film may, e.g., be polyethylene or a vinyl resin such as polyvinyl chloride. Glass fibres may be supplied from a forehearth and form into a mat 145 on a conveyer 140. A suction chamber 142 assists compaction of the fibres into a layer which passes between rolls 150 where it meets a thermoplastic film 147 and the two layers then pass below heating elements 152 which heat the film to a semi-fluid state; they then pass over a suction chamber 156 which draws the film against the web. The suction may be supplemented by pressure and in either case the film may be perforated by the air pressure. The roll 159 presses the film on to the surface further and cools it whilst suction is maintained. Further rolls 160 and 161 provide further cooling. An inspection box 163 casts up a light'through the web. A film may be applied also to the other surface of the web. Cut strands or rovings of glass fibres may be used instead of the loose fibres, or a board of glass fibres or other particles held together by a resinous or other binder may be used as the porous web. In such cases the thermoplastic film will not bond the fibres as it does with the thin mat previously described, but will merely coat the surface. |
