초록 ▼

A process and a device for the injection molding of plastic objects of thermoplastic, duraplastic, or elastomeric material implements the steps of: a) injecting a sufficient quantity of molten plastic into cavity (2) of a mold (1) along a melt flow path, which extends from a unit (4,5) for plasticiz

A process and a device for the injection molding of plastic objects of thermoplastic, duraplastic, or elastomeric material implements the steps of: a) injecting a sufficient quantity of molten plastic into cavity (2) of a mold (1) along a melt flow path, which extends from a unit (4,5) for plasticizing and injecting the plastic through a plastic injection nozzle (3) into mold (1); b) introducing a pressurized fluid, particularly a pressurized gas, from a wall (7) of cavity (2) through at least one fluid injection element (6), so that a fluid blanket (8) forms between wall (7) of cavity (2) and the plastic introduced into the mold; c) allowing the molded part thus produced to harden; d) relieving the cavity (2) of the pressure of the pressurized fluid; and e) demolding the molded part. It is provided according to the invention that at least one surface projection (9) is provided in the mold (1), on the cavity wall (7), such that its upper plateau (10) runs extensively parallel to the cavity wall (7). The pressurized fluid is injected by means of at least one fluid injection element (6) in the region of upper plateau (10) of the surface projection (9), such that fluid blanket (8) forms between the plastic and upper plateau (10) of surface projection (9). Thus, the fluid blanket is controlled to be limited in its extent.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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, t

[ What is claimed is:] [1.]1. 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.