Method for producing a hollow vessel having outer annular projec

Details Method for producing a hollow vessel having outer annular projec Method for producing a hollow vessel having outer annular projec

1988-10-17

1989-06-27

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264534, 264542, 425525, 425530, B29C 4918, B29C 4930

Patent

active

048428027

ABSTRACT:
Process for producing a blown hollow vessel having an external annular projection integrally formed from the vessel wall in the blowing process. The vessel is formed initially in a mold having a reduced contour in the wall regions adjoining the annular projection. The vessel thus formed is then placed in a mold having the desired finished contour and blown to its final shape. In this manner, the vessel wall adjoining the annular projection is stretched and the inner surface of the vessel wall is smoothed in the area where the annular projection was formed.

REFERENCES:
patent: 3843005 (1974-10-01), Uhlig
patent: 3956441 (1976-05-01), Uhlig
patent: 4170622 (1979-10-01), Uhlig
patent: 4170623 (1979-10-01), Dubois et al.
patent: 4228911 (1980-10-01), Hammes
patent: 4650627 (1987-03-01), Peters

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