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preform |
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preform [prē′fȯrm] (engineering) A preshaped fibrous reinforcement. A compact mass of premixed plastic material that has been prepared for convenient handling and control of uniformity during the mold loading process. (engineering acoustics) The small slab of record stock material that is loaded into a press to be formed into a disk recording. Also known as biscuit (deprecated usage). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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It reportedly allows molding preforms at 20[degrees] F lower melt temperature and 5% to 10% faster. 0, into rectangular preforms containing different volume fractions of alumina (NF and SF) and alumina-silica (CF) short ceramic fibers. The accuracy of all ECOs ([+ or -] 1% by volume) means that considerable material savings can be achieved in preform production (and shaped preforms are said to reduce the risk of mold rejects). |
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