Patent ID: 6372177
Filing Date: 2002-04-16
Classification: B29C,B60R

Abstract:
Method of manufacturing a plastic article with a cavity enclosed in the same, comprising the following steps:injection of plastic material under pressure into a mould cavity, cooling the plastic material closest to the walls of the mould cavity, injection of gas under pressure into fluent plastic material, which is surrounded by the cooled plastic material, pressing out fluent plastic material to at least one spill chamber located outside the mould cavity and communicating with the mould cavity, by means of the injected gas to form a cavity in the plastic material, and separation of the plastic material in the spill chamber from the plastic material in the mould cavity, characterized in that a communication with a predetermined flowthrough area is maintained between the mould cavity and the spill chamber during the injection of the fluent plastic material, and that a communication with a larger predetermined flowthrough area is maintained between the mould cavity and the spill chamber during the injection of the gas.