| 摘要 |
1346780 Coating process STANDARD OIL CO 24 Feb 1971 5323/71 Heading B2E A plastics laminate is obtained by a process comprising advancing a sheet of heat-fusible foamed plastics material past an extruder die, continuously extruding a layer of molten resinous polymeric material from the die on to the surface of the sheet, the polymeric material then contacting the sheet being at a temperature sufficient to fuse a thin surface layer of the sheet, and compressing the sheet and resinous polymeric material to form a laminate. The sheet may be compressing by passing it between a nip roller and a chill roller, the path of the sheet being diverted by a third roller so that the sheet extends around a portion, e.g. at least a half, of the chill roller and the layer of molten material is extruded on to the surface of the sheet which contacts the chair roller. The surface speed of the nip roller may be from 0-10% slower than that of the chill roller and the surface speed of the third roller may be from 0-10% faster than that of the chair roller. The fusible foamed sheet may be of polystyrene, styrene copolymer or poly vinyl chloride and the resinous polymeric material may be acrylonitrile-butadiene-styrene copolymer, polyvinyl chloride, crystalline polystyrene, rubbermodified polystyrene or acrylonitrile-styrene copolymer. Alternatively, both the foamed sheet and the resinous polymeric material may be polyethylene or they may both be of polypropylene. |
