Canadian Plastics

New window frames use 45% less material

A collaboration between Presma Corp. and Cinpres Gas Injection, Ltd. has led to the development of a large, ground-breaking window frame for the construction industry, soon to be marketed in the U.S....

February 1, 2005   Canadian Plastics



A collaboration between Presma Corp. and Cinpres Gas Injection, Ltd. has led to the development of a large, ground-breaking window frame for the construction industry, soon to be marketed in the U.S. The inside and outside frames, manufactured by an unspecified company, are produced using a combination of co-injection and gas-assist molding. Co-injection of two polypropylene materials, virgin and recycled grades, is used to produce a frame with a cosmetic, UV-resistant skin and a low-cost core. Gas-assist results in frame sections which are hollow, achieving a weight savings of up to 45%.

Presma Corp, the American subsidiary of Presma of Italy, developed a patented system for connecting high pressure gas to each mold from a single connection to the gas controller enabling the retention of in-mold gas pressure when rotating to second, third or fourth station positions. Cinpres has modified its MF Multi-Function control software to enable one or two gas control circuits to operate different pressure/time cycles to suit each mold on up to eight stations. Each pressure/time cycle is set and displayed graphically on a 12 in. TFT touch screen.

Cinpres Gas Injection, Ltd.

(Dalan Plastic Machinery, 519-925-3493)

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