Patent ID: 6294126
Filing Date: 2001-09-25
Classification: B29C

Abstract:
A process for the injection molding of a plastic object, comprising:injecting a sufficient quantity of molten plastic into a cavity of a mold along a melt flow path, which extends from a plasticizing and injection unit through a plastic injection nozzle into the mold, the mold including a surface projection from a wall of the cavity into the cavity, the surface projection having lateral regions;tempering the lateral regions of the surface projection causing an increased solidification of the molten plastic in the lateral regions;introducing a pressurized fluid into a region limited to an upper plateau surface projection on the wall of the cavity into the molten plastic, the pressurized fluid forming a fluid blanket limited to a space between the plastic and upper plateau of the surface projection, the plastic forming a gas seal surrounding the upper plateau of the surface projection;allowing the molded part thus produced to harden;relieving cavity of the pressure of the pressurized fluid; anddemolding the molded part.