Verfahren und Vorrichtung zum Blasformen

摘要

In a method of blow moulding, a parison is extruded by pushing a hollow tube of hot thermoplastic material through a die gap 2 between a mandrel 3 and die 1. An exit compression ring 5 is formed on the mandrel 3 adjacent to the die exit 2. The ring acts as a flow enhancer to ensure free flow of the thermoplastic material. Outer surfaces of the die 1 and mandrel 3 may be provided with release strips 9, 10 to prevent the parison becoming stuck to the die face.