Method for blow molding a hollow plastic article having a concav

Details Method for blow molding a hollow plastic article having a concav Method for blow molding a hollow plastic article having a concav

1975-09-16

1977-07-12

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

264 405, 264 89, 264 94, 264296, B29C 1707

Patent

active

040354555

ABSTRACT:
In a blow-moulding process, the base of a hollow plastics body is formed initially of convex configuration and then a portion of the base is deformed inwardly to provide a concave area surrounded by an annular support surface. Deformation of the base is controlled in response to an increase of pressure in the mold cavity after termination of venting thereof.

REFERENCES:
patent: 688924 (1901-12-01), Blair et al.
patent: 2123552 (1938-07-01), Helwig
patent: 2952875 (1960-09-01), Herrick
patent: 3496257 (1970-02-01), Brown et al.
patent: 3666849 (1972-05-01), Williams et al.
patent: 3764644 (1973-10-01), Robinson
patent: 3819789 (1974-06-01), Parker
patent: 3865530 (1975-02-01), Jesselallee et al.

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