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causes and solutions for flash

When two halves of a mold come together, the sides of the cavities must press together tight enough that no molten plastic leaks out of the cavity, resulting in a thin layer of plastic protruding from the part called flash. The plastic injection molding press must have enough tonnage, and the mold must be properly built and maintained to avoid this problem. However, some materials flash more easily than others. In fact, most thermoset materials will flash regardless of the press and mold. These parts need to be “deflashed” as a secondary operation.
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