Method for producing multi-layer pipe conduit components of plas

Details Method for producing multi-layer pipe conduit components of plas Method for producing multi-layer pipe conduit components of plas

1989-09-22

1993-04-13

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264311, B29C 4104

Patent

active

052020762

ABSTRACT:
A rotating mold is fed with a flowable mixture of an inorganic filler material powder and a polyester resin for the purpose of generating or building up individual layers. By selecting the rotating speed during the layer buildup a more or less pronounced separation between resin and filler material is produced inside the layer, the value of the separation being selected in accordance with the specific application the component produced is intended to be used for. Subsequently the layer is fed cut glass fibers made to penetrate at least into the innermost resin-enriched region of the generated layer. Owing to this rotational-speed-controlled distribution of filler material and resin inside the layers, larger values of mechanical strength may be obtained with reduced glass requirements. Any "strain-corrosion" may be avoided by using filler materials containing carbonate. The pipe conduit of the invention has thin-walled layers going over into each other and arranged to have layers containing glass fibers alternate with layers containing no glass fibers, the specific structure of the wall cross-section being determined in accordance with the specific requirements of the application at hand.

REFERENCES:
patent: 3406724 (1968-10-01), Carlstrom et al.
patent: 4383965 (1983-05-01), Rother
patent: 4405398 (1983-09-01), Rother
patent: 4515547 (1985-05-01), Rother
patent: 4518556 (1985-05-01), Yamamoto
patent: 4957683 (1990-09-01), Hartmann

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