Gas pressure assisted molding, e.g. for injection blow molding, involves injecting a cooling medium into the gas stream just upstream of the blowing nozzle

摘要

Pressurized gas passes through a control valve (2) to the molding tool (3) and is introduced through a nozzle (6) into the molded component (4). Before reaching the tool (3), a cooling medium (8) is injected through a transfer valve (7). The cooling medium can be water, liquid or gaseous nitrogen, or liquid or gaseous carbon dioxide. An independent claim is also included for the corresponding equipment, incorporating controls to obtain optimum cooling of the component.