Process for injection molding of thermoplastics and split mold f

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles

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264310, 2643288, 26432812, B29F 106

Patent

active

044393903

ABSTRACT:
An injection molding process is adaptable to various branches of industry for the production of high-strength textured articles from thermoplastic materials. The process consists of successively filling the intercommunicating cavities of a split mold with a polymer melt, holding the latter under pressure, and cooling the melt. As the hot melt is held under pressure and cooled, it is forced through the mold cavities at a temperature not exceeding the polymer melting or yield temperature by not more than 40.degree. to 50.degree. C., and under a pressure of 900 to 3,000 kgf/cm.sup.2. The mold surfaces are cooled within the temperature range starting from -20.degree. C. and ending with the polymer initial melting or yield temperature. Mounted in the split mold, having half-molds with a die and plunger, are conventional heaters arranged at the inlet and outlet openings in isolation from the remaining part of each half-mold.

REFERENCES:
patent: 2976571 (1961-03-01), Moslo
patent: 3779506 (1973-12-01), Adams
patent: 3907952 (1975-09-01), Cleereman
patent: 4094952 (1978-06-01), Frank
patent: 4309163 (1982-01-01), Cottancin

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