05Lecture-p1-ch13 - Manufacturing and Production Processes...

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Manufacturing and Production Processes ENGR 3190U – Lecture 05 – Part 1 Chapter 13 - Shaping process for plastics Sections 13.7, 13.8, 13.9, 13.12 1. Compression & transfer molding 2. Blow molding & rotational molding 3. Thermoforming 4. Product design considerations 5. In class video clips: Blow molding
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Compression Molding Figure 13.28 Compression molding for thermosetting plastics: (1) charge is loaded, (2) and (3) charge is compressed and cured (4) part is ejected and removed.
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Molds for Compression Molding Simpler than injection molds No sprue and runner system in a compression mold Process itself generally limited to simpler part geometries due to lower flow capabilities of TS materials Mold must be heated, usually by electric resistance, steam, or hot oil circulation Typical compression-molded products: Electric plugs, sockets, and housings; pot handles, and dinnerware plates
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Transfer Molding TS charge is loaded into a chamber immediately ahead of mold cavity, where it is heated; pressure is then applied to force soft polymer to flow into heated mold where it cures Two variants: Pot transfer molding - charge is injected from a "pot" through a vertical sprue channel into cavity Plunger transfer molding – plunger injects charge from a heated well through channels into cavity
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Figure 13.29 Pot transfer molding: (1) charge is loaded into pot (2) softened polymer is pressed into mold cavity and cured (3) part is ejected.
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