Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1986-08-19
1988-11-22
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264541, B29C 4700, B29C 4730
Patent
active
047864583
ABSTRACT:
A heat-softening plastic material is extruded such that the plastic material forms a pine-shaped outer member and at least one rod-shaped core member is positioned in the inside space of the pipe-shaped outer member. Divided forming molds are disposed about the extruded plastic material except for an entrance opening for introducing gas such that only the pipe-shaped outer member is expanded by the pressurized gas and the thus formed container is subsequently cooled and hardened. The thus formed hollow container has at least one rod-shaped support extending between the upper and lower ends on the inside of the hollow container. The container will not expand and remains stable even if a high pressure fluid is introduced into the inside of the container.
REFERENCES:
patent: 3080614 (1963-03-01), Adams
patent: 3084395 (1963-04-01), Thielfoldt
patent: 3103036 (1963-09-01), Nave et al.
patent: 3371376 (1968-03-01), Fischer et al.
McCarthy Neil M.
Silbaugh Jan H.
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