Apparatus and method for advanced structural foam molding

Details Apparatus and method for advanced structural foam molding Apparatus and method for advanced structural foam molding

B - Operations, Transporting

29

C

B29C 44/42 (2006.01)

Patent

CA 2517995

An advanced structural foam molding technology for improving the dispersion of the blowing agent in the polymer matrix has been invented. This technological innovation is an improvement on the well-known existing low-pressure structural foam molding technology based on the preplasticating-type (so called piggy-bag) injection- molding machines. By introducing means for continuing the polymer matrix melt flow stream, preferably an additional accumulator and a gear pump, the processing conditions become more consistent to disperse the injected gas more uniformly in the polymer matrix. By using this technology, the structural foams have a smaller cell size, a more uniform cell structure, a larger void fraction (i.e., more material saving), less surface swirl, and less weld line contrast.

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