| 摘要 |
PCT No. PCT/CH86/00153 Sec. 371 Date Jul. 14, 1987 Sec. 102(e) Date Jul. 14, 1987 PCT Filed Nov. 4, 1986 PCT Pub. No. WO87/03109 PCT Pub. Date May 21, 1987.In a process for the production of smooth surfaced parts, a paste material, which includes paste or granule pieces which are coated with added pigment and then pressed back together, is applied, in the form of an extrusion or a coating, to a substrate. The extrusion or coating is subjected to a first, incomplete hardening, after which it is no longer flows freely under its own weight. The surface layer, containing added pigment, is then removed from a surface to be used. This surface is subsequently smoothed, and the hardening of the coating to form a hard material is completed. The smoothing and the completion of the hardening can occur in the same processing step as a shaping for the formation of separable shaped parts. The substrate can be inseparable from the hardened coating. The surface layer, containing added pigment, can be removed by mechanical means, solvents or abrasion by a suspension in liquid or air, if appropriate in the presence of ultrasound. The extrusion can also be cut in order to form a surface layer which is free of added pigment. The process can be used for the production of gemlike shaped parts.
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