Method for producing a hollow plastic product having a radially

Details Method for producing a hollow plastic product having a radially Method for producing a hollow plastic product having a radially

1992-01-10

1993-03-30

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264513, 264515, 264534, 425112, 425113, 425127, 425525, 425532, B29C 4904, B29C 4920

Patent

active

051981742

ABSTRACT:
A method for producing a plastic product including an axially extending portion, such as a duct or pipe, and a radially extending portion, such as a flange or bracket. A parison is placed in a first mold cavity defined in a mold and blow molded to form the axially extending portion, and then a movable mold segment is moved to a retracted position to define a second mold cavity adjacent to a part of an outer peripheral surface of the axially extending portion thus formed. Then, a second molted plastic material is supplied into the second mold cavity and the movable mold segment is again moved to another predetermined position to pressurize the second plastic material to thereby form a radially extending portion. The resulting hollow plastic product is extremely high in structural integrity between the axially and radially extending portions.

REFERENCES:
patent: 3917789 (1975-11-01), Heisler
patent: 4170623 (1979-10-01), Dubois et al.
patent: 4713207 (1987-12-01), Udell et al.
patent: 4946368 (1990-08-01), Masumoto
patent: 5013515 (1991-05-01), Aoki
patent: 5057266 (1991-10-01), Belcher
patent: 5089208 (1992-02-01), Nakamura et al.

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