Molded plastic structural web articles

Details Molded plastic structural web articles Molded plastic structural web articles

1978-12-08

1980-11-18

Dixon, Jr., William R.

Stock material or miscellaneous articles

Structurally defined web or sheet

Longitudinal or transverse tubular cavity or cell

264572, 264574, 428 36, B32B 330, B29H 702

Patent

active

042346428

ABSTRACT:
A process is disclosed for the production of molded tubular structural web articles of thermoplastic material comprising the steps: passing molten plastic material into a tubular mold cavity to fill a substantial portion of said cavity; injecting a low viscosity pressurizing fluid into said material in said mold cavity; coordinating the fluid flow rate, pressure, temperature and plastic material volume so that the pressurizing fluid divides into at least two streams on entering said material without causing the low viscosity pressurizing fluid to break through said material flow front so that, when pairs of melt fronts merge, a molded tubular structural web article is formed having a solid web at each point of merger; and maintaining a positive pressure in the mold cavity after pressurizing until said tubular article is self-supporting. The resulting tubular structural web articles are also disclosed.

REFERENCES:
patent: 3940467 (1976-02-01), Brachman
patent: 4101617 (1978-07-01), Friederich
patent: 4136220 (1979-01-01), Olabisi

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