Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1983-03-07
1985-05-21
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264516, 264531, 264533, 264534, 264541, 425525, 425532, B29C 1707, B29D 300
Patent
active
045185581
ABSTRACT:
A method and apparatus for producing hollow plastic articles are disclosed. The articles have a blow-molded portion and a compression-molded portion, and are formed by downwardly extruding plastic at at least one extrusion rate to progressively form a parison having a downwardly facing open end from a first location adjacent an extrusion head toward a second location axially spaced therefrom. A male mold member is provided at the second location. Portions of the open end of the parison are engaged by a plurality of fingers, while the open end travels toward the second location and the engaged portions are moved downwardly at a rate at least corresponding to the extrusion rate. During the travel toward the second location, portions of the open end are radially expanded and guided over the male mold member. The parison is enclosed in a hollow mold having a molding surface corresponding to the blow-molded portion of the hollow article and having a second portion having a molding surface corresponding to the compression molded portion of the hollow article and cooperating with the male mold member. Air is admitted to the interior of the first portion to form the blow-molded portion.
REFERENCES:
patent: 3100317 (1963-08-01), Perry
patent: 3275726 (1966-09-01), Rudolph
patent: 3371376 (1968-03-01), Fischer et al.
patent: 3452391 (1969-07-01), Langecker
patent: 4092392 (1978-05-01), Dunbeker
patent: 4334852 (1982-06-01), Haubert
Anway Kenneth L.
Born Gerald W.
Quality Products, Inc.
Silbaugh Jan
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