Thermoplastics and Injection Molding
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Title: Thermoplastics and Injection Molding

Essay Details:

Subject: Science
Author: Mary G
Date: January 22, 2013
Level: University
Grade: A
Length: 8 / 2228

Essay text:

Thermoplastic polymers differ from thermosetting polymers (Bakelite; vulcanized rubber) which once formed and cured, can never be remelted and remolded. Many thermoplastic materials are addition polymers; e.g., vinyl chain-growth polymers such as polyethylene, polyvinyl chloride and polypropylene, and others like polystyrene, polyester, acrylics, nylons and cellulosics Thermoplastics can be melted and re-molded, and thus they can be recycled. This also means that they can be farbricated by processes that use plastic flow. Injection Molding is one such process. History of Thermoplastics ? 1868 - John Wesley Hyatt injection molds Celluloid billiard balls...

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