Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Forming plural articles
Patent
1981-10-02
1984-03-27
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Forming plural articles
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
Abramov Vsevolod V.
Gerasimov Vasily I.
Kuznetsov Vsevolod V.
Rysin Nikolai I.
Tkhai Vitaly S.
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