Closed end sleeve producing method and core structure used in th

Details Closed end sleeve producing method and core structure used in th Closed end sleeve producing method and core structure used in th

1989-02-08

1991-04-23

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including use of vacuum

26417711, 26421111, 264335, 264563, 264573, 425467, B29C 6900

Patent

active

050098322

ABSTRACT:
A method for producing a sleeve having a closed end by extruding a forming material from a mouthpiece. A core member is arranged in position in the mouthpiece and has a piston member detachably provided in a tip end of the core member. The piston member has an air communication aperture. On the other hand, an outer die is arranged in the mouthpiece for forming an outer configuration of the closed end. As a result, an annular space is formed by the mouthpiece, core member and outer die. The forming material is then supplied into the annular space and extruded to form the closed end of the sleeve. After the outer die has been removed from the mouthpiece, the piston member is caused to slide relative to the mouthpiece and at the same time the air is blown into an 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.

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patent: 4652292 (1987-03-01), Ziegler et al.
patent: 4810458 (1989-03-01), Oshima et al.

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