Method of making a collapsible foam mandrel

Details Method of making a collapsible foam mandrel Method of making a collapsible foam mandrel

1976-09-07

1978-05-02

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 467, 264225, 264236, 264278, 264279, 264313, 264334, 264259, B29D 300, B29D 2704

Patent

active

040875024

ABSTRACT:
Method of making a cylindrically shaped, partially collapsible, foam mandrel to be used for the manufacture of hollow resin impregnated fiber tubes. The mandrel is made of a substantially rigid foam cylindrical member, an extractable bar, and a means for aiding in collapsing the cylindrical member such as a groove. Both the extraction bar and the means for aiding in collapsing the cylindrical member are disposed in and along the entire length of the cylindrical member such that the longitudinal axis of the bar, the means for collapsing the cylindrical member, and the axis of the cylindrical member preferably lie on the same plane.
The method of manufacturing the aforementioned mandrel comprises the steps of first providing a circular mold having upper and lower sections. A groove-forming member is placed in the lower section and the extraction bar is placed on the upper section. Foam forming material is poured into the lower section which is then covered with the upper section. Because the foam forming material expands, a generally cylindrical member is formed with the extraction bar and the groove forming member disposed therein. Finally, the cylindrical member is allowed to cure whereby a partially collapsible, foam mandrel is produced.

REFERENCES:
patent: 2582022 (1952-01-01), Feldman et al.
patent: 3396923 (1968-08-01), Windecker
patent: 3446692 (1969-05-01), Turnbull

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