| 摘要 |
<p>1492332 Coated thermoplastic film BRAAS & CO GmbH 10 Oct 1975 [26 Oct 1974 14 June 1975] 41602/75 Heading B2E A thermoplastic film, e.g. of polyvinyl chloride, is coated with a single layer of inorganic particles, e.g. glass or quartz, in a binder such as polyvinyl chloride or an acrylic resin which is dried or cured. The particles are adjacent to the film layer and cover 20 to 95% of its surface and consist of substantially spherical or ground rounded edge particles of average particle diameter 1 to 80 microns or fibre like or plate shaped particles of average particle diameter 1 to 500 microns. A printing ink binder may be applied to the substrate as primer, e.g. by lacquering, screen printing, reverse roller coating or curtain coating. The binder may be applied to the film by a knife technique, by extrusion, by melt roller application or by melt coating. The particles may be applied to the binder by powder brushing, spreading or electrostatic spreading. The particles sink into the binder as shown in Figure 1 and may be partly embedded in the substrate, e.g. by rollers or belts. The particles may be mixed with the binder before application to the film. A single layer of particles is formed by means of a stripping wiper or an air jet. The product may be embossed or pressed to satisfy requirements of gloss, roughness and resistance to heat deformation.</p> |
