| 摘要 |
<p>A mass for injection moulding of plastic articles possesses a basic formulation comprising the following components: thermosetting resin, polymerization catalysts, cross-linking agents, plasticizing materials, non-hygroscopic lubricating fillers, non-hygroscopic and non-lubricating fillers and recycled materials. The percentages by weight of the various components are carefully worked out so that the moulded articles have a low coefficient of static friction together with high stability of the same during prolonged use. The basic composition in micronized form, less than 100 µm, is cold mixed, then subjected to hot calendaring and ground to make granules or tablets. The articles, moulded by transfer technique, are subjected to thermal cycles for stabilization and, lastly, to lapping cycles using abrasive materials of different granular sizes.</p> |
