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5、二、注塑模和壓縮模 盡管成型某些熱固性材料的方法取得了一定進步，但注塑模主要（還是）用來生產(chǎn)熱塑性塑件（這主要是因為）熱固性塑料熔體的過程中，也會出現(xiàn)這種情況，這個問題一直非常難解決。住宿成型要換里和鑄造十分相似。住宿成型的工藝過程包括：首先把料斗中的粉狀或粒狀的塑料混合物依次輸送到定量去和熔化區(qū)，然后再注射到模具型腔中，經(jīng)過短時冷卻后，開模，推出成型塑件。注塑機分為手動，半自動及全自動操作。住宿模具有以下優(yōu)點： （ i） 較高的成型速度使大批量生產(chǎn)成為可能； （ 為成形具有不同使用性能的熱塑性材料提。

6、The Injection Molding1The injection moldingInjection molding is principally used for the production of the thermoplastic。

7、The Injection Molding1The injection moldingInjection molding is principally used for the production of the thermoplastic。