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TOKYO, Sept 14 (Bernama) -- Polyplastics Co., Ltd., a leading global supplier of engineering thermoplastics, has identified several solutions to help processors limit the occurrence of gas burns during the injection molding process. The company used its Gas Investigation Method in Injection Molding (GIMIM) test method to analyze the phenomenon and help pose preventative measures.
Gases that are produced during molding have no place to escape and are compressed, thus resulting in a hot, burned resin surface which threatens continuous molding. First, the study examined gas resulting from energy loss at the time of injection. The nozzles of typical injection machines are comprised of a drastically contracted structure, and energy loss arises due to the shape. Potential solutions include lowering the injection speed, using multiple gates or cavities, and increasing the size of the gate and nozzle.
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