Patent ID: 7255818

Claim:
A method for producing a plastic part utilizing a fluid-assisted plastic injection molding process: providing a mold cavity in a mold for formation of a plastic molded part having at least one thicker section, the mold cavity having a gate for entry of plastic material; positioning a first pressure transducer in the mold cavity, the pressure transducer being positioned between the gate and the thicker section; injecting a quantity of plastic material into the mold cavity, said quantity being less than an amount needed to completely fill the mold cavity; detecting a first pre-established pressure reading from said first pressure transducer; injecting a pressured fluid from a controller into the plastic material in the mold cavity based on the detection of said pre-established pressure, said pressured fluid forming a hollow space in the at least said one thicker section of the mold cavity and; packing the plastic material in the mold cavity.