VERFAHREN ZUR HERSTELLUNG VON HUELSEN MIT GESCHLOSSENEM ENDE UND AUSBILDUNG EINES KERNES FUER DIESES VERFAHREN.

摘要

A sleeve (7) having a closed end is produced by extruding a forming materia! from a mouthpiece (1). A core member (2) is arranged in position in the mouthpiece and has a piston member (5) detachably provided in a tip end of the core member. The piston member has an air communication aperture. An outer die (3) is arranged on the mouthpiece for forming an outer configuration of the closed end, so that a moulding space is formed by the mouthpiece, core member and outer die. The forming material is then supplied into this space and extruded to form the closed end of the sleeve. After the outer die (3) has been removed from the mouthpiece (1), the piston member (5) is caused to slide relative to the mouthpiece and at the same time the air is blow into the inside of the closed end through the air communication aperture of the piston, while the forming material is further supplied and extruded from the mouthpiece to form the closed end sleeve.