Liquid molding pressure control apparatus

摘要

A liquid molding pressure control apparatus is provided that includes a housing and a piston assembly movably disposed within the housing. The piston assembly includes a shaft and first and second pistons engaged with the shaft. The housing is configured to receive a pressurized fluid adjacent the first piston and to receive a starting material adjacent the second piston. The first and second pistons are sized such that the starting material received within the housing exits the housing at a pressure greater than the pressure of the pressurized fluid received within the housing. Accordingly, the liquid molding control apparatus may be used to increase the pressure within the mold cavity after mold cavity has been provided with the starting material. Alternatively, the liquid molding control apparatus may be used to substantially maintain pressure within a mold cavity after the mold cavity has been provided with the starting material.