Multi-component injection moulding tools - have their cavity connected to minor chamber which is filled with shot before second component is injected

摘要

The injection mould for multiple-component mouldings has a cavity which is connected (a) to the nozzle feeding the polymer and (b) to a feed of a second component to be made when the mould has already been filled; the cavity is connected to at least one space which is partly filled with the shot of material before the second component is fed in. ADVANTAGE - The system enables internally gas-pressurised mouldings to be produced free from defects. It therefore cuts out any need for post-moulding operations on the parts moulded.