Importance

Loading Importance Indicators...

Abstract

The dimensions of a plastic product are controlled while injection molding the product in a mold cavity of a mold comprising a core section and a cavity section, separated by a parting line and defining the mold cavity. In one method the mold cavity wall thicknes is controlled during an injection of a first quantity of plastic material by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs a predetermined period after discontinuing the flow of plastic material into the mold cavity and after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of a at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material. In another method, the mold cavity wall thickness is controlled during an injection of a first quantity of plastic material, which does not completely cover the parting line of the mold, by locking the core section to impede lateral movement thereof by means of contact between a non-perpendicular contact surface of a protracted contact element of one mold section and an associated non-perpendicular contact surface of the other mold section, and is further controlled during an injection of a second quantity of plastic material, which occurs after the contact element has been retracted, by locking the core section to impede lateral movement thereof by means of at-least-partly-solidified wall sections having a controlled thickness formed during the injection of the first quantity of plastic material.

Loading the Abstract Image...

First Claim