A series of bulk molding compounds (BMC) WERE EVALUATED ON BOTH RECIPROCATING SCREW INJECTION AND DIRECT PLUNGER INJECTION MOLDING MACHINES. Both quantitative and qualitative data were collected and evaluated to determine the optimum processing method. An automatic BMC hopper- feeder was developed which reduces labor input to the BMC molding operation by as much as 50 percent. The effects of glass fiber degradation, fiber orientation, and resin segregation on the molded part as a function of the processing machinery was investigated. It was found that the density of the part as a function of the processing machinery was investigated. It was found that the density of the part is more critical than strength loss due to fiber breakage. It is necessary, therefore, within the molding machine to have absolute control over injection pressures and finite control over shot size. (Author, modified-PL) ANNOTATION: Injection molding bulk compounds.
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