Alternative pressure control for a low constant pressure injection molding apparatus

摘要

A low constant pressure injection molding machine forms molded parts by injecting molten thermoplastic material into a mold cavity at low constant pressures of 6,000 psi and lower. As a result, the low constant pressure injection molding machine includes a mold formed of easily machineable material that is less costly and faster to manufacture than typical injection molds.

主权项

1. A melt pressure regulating mechanism for an injection molding apparatus having a melt holder for pressurizing molten plastic prior to injection into a mold, the molten plastic having a melt pressure, and an injection element for advancing the molten plastic from the melt holder through a nozzle and into the mold, the melt pressure regulating mechanism comprising:
a pressure regulating device, disposed between the melt holder and the mold but separate from the nozzle, the pressure regulating device configured to maintain molten plastic within a mold cavity of the mold at a substantially constant melt pressure, the pressure regulating device comprising at least one of a fluid pressure regulating valve and a pressure relief valve.