Method of making tortuous tubular articles

Details Method of making tortuous tubular articles Method of making tortuous tubular articles

1977-12-29

1978-11-07

Hoag, W. E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

B29C 112, B29D 2300

Patent

active

041246780

ABSTRACT:
Method for making tubular articles of tortuous configuration and of resin impregnated material. The method is intended to avoid resin-starved areas in the product. Specifically, tubular articles having high curvature, sharp transitions in cross section size and/or shape and close tolerance ends are provided these being made by applying and incorporating selectively placed porous components.
The article is formed in a mold by an inflatable mandrel which carries a continuous, surrounding knitted fabric component and one or more localized foam, felt and/or fabric devices of porous nature which control the supply, flow and/or final disposition of resin matrix in the molding process.

REFERENCES:
patent: 1981949 (1934-11-01), DeWitt
patent: 2514597 (1950-07-01), Daly
patent: 2995781 (1961-08-01), Sipler
patent: 3015855 (1962-01-01), Merkel
patent: 3193438 (1965-07-01), Schaefer
patent: 3755037 (1973-08-01), Erwin

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