Abstract: Injection molding apparatus is disclosed including a two cavity split-mold with a flow passage between the cavities. The sprue channel is heated as is the flow passage between the mold cavities. The apparatus has a rotatable core with a longitudinal recess. The flow passage has replaceable inserts for varying the size of the flow passage.

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.