Plastic Article Forming Apparatuses and Methods for Using the Same

摘要

A system for forming a plastic article, the system comprising a preform injection molding apparatus, comprising a mold, a plastic melt injection system, a sensor, and a controller, wherein: the first mold portion is made of a material having a thermal conductivity between about 52 watts per meter kelvin and about 385 watts per meter kelvin; the controller is configured to control the injection element to maintain the molten thermoplastic material at a substantially constant melt pressure, during filling of the mold cavities, wherein the substantially constant melt pressure is between about 2.76 megapascals (400 psi) and about 68.95 megapascals (10,000 psi); and the preform injection molding apparatus is designed to have a useful life of between one million and ten million injection molding cycles.

主权项

1. A system for forming a plastic article, the system comprising a preform injection molding apparatus for forming a preform, which is configured to be subjected to a subsequent forming process, the preform injection molding apparatus comprising a mold, a plastic melt injection system, a sensor, and a controller, wherein:
the mold has a first mold portion and a second mold portion; the mold is configured to move from an open position, wherein the first mold portion and the second mold portion are separated, to a closed position, wherein the first mold portion and the second mold portion form a plurality of mold cavities; the first mold portion is made of a material having a thermal conductivity between about 52 watts per meter kelvin and about 385 watts per meter kelvin; the plastic melt injection system includes a melt holder configured to retain molten thermoplastic material and an injection element configured to inject the molten thermoplastic material into the mold cavities; the sensor is configured to sense a characteristic of the molten thermoplastic material in the melt holder and to transmit to the controller, a signal from the sensor;The controller is configured to control the injection element to maintain the molten thermoplastic material at a substantially constant melt pressure, during filling of the mold cavities, wherein the substantially constant melt pressure is between about 6.89 megapascals (1,000 psi) and about 103.42 megapascals (15,000 psi); and
the preform injection molding apparatus is designed to have a useful life of between one million and ten million injection molding cycles.