Demolding and ejection of molded components from a plastics processing machine involves feeding liquid gas to a recess in tool half below component where fluid gas expands to gaseous state for ejection

摘要

A feed line(14) enters the tool cavity via a surface(19a) facing the component(18) and directs a controled flow of compressed gas at the component to detach it from the tool surface. Gas is in a liquid form when it reaches an area immediately beyond the mouth(17) of the feed line. In this area a pressure drop occurs and the liquid gas is coverted into a gaseous state. T : A feed line(14) enters the tool cavity via a surface(19a) facing the component(18) and directs a controled flow of compressed gas at the component to detach it from the tool surface. Gas is in a liquid form when it reaches an area immediately beyond the mouth(17) of the feed line. In this area a pressure drop occurs and the liquid gas is coverted into a gaseous state as its volume greatly increases. The sudden increase in gas volume loosens and ejects the component from the tool surface. An independent claim is included for the process equipment which includes a tool with male(12) and female(11) parts. One or both tool parts have a gas feed line mouth(17) in its surface(19a) facing the component(18). A recess(V) in the surface(19a,19b) of at least one tool half, close to the gas feed line mouth houses a highly porous, compression resistant material block(20) with pore-like, branched flow channels for introducing gas between component and tool surface.