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...Design and manufacturing of plastic injection mould content molding history equipment cycle trial defects machine types machines unit clamping gate type sprue edge tab overlap fan film or flash diaphragm internal ring external spoke multipoint pin gates submarine tunnel curved hot runner valve why molds are expensive from wikipedia the free encyclopedia british moulding is a technique for making parts both thermoplastic thermosetting materials in production molten injected at high pressure into mold which inverse product s shape after designed usually by an industrial designer engineer made moldmaker toolmaker metal either steel aluminium precision machined to form features desired part widely used variety smallest component entire body panels cars most common method with some commonly items including bottle caps outdoor furniture typically capable tolerances equivalent it grade about polystyrene low cost lacking strength longevity other abs acrylonitrile butadiene styrene ter polymer ...