Method of making and using molds for longitudinally curved secti

Details Method of making and using molds for longitudinally curved secti Method of making and using molds for longitudinally curved secti

1979-08-22

1981-06-30

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

249 91, 249160, 264 469, 264225, B29D 2704

Patent

active

042762456

ABSTRACT:
A first mold is made by mounting a plurality of semicircular ribs of a relatively large radius on a board in spaced relationship and centered along an arc on the board with the ribs extending generally radially of the arc and having diametral portions of their peripheries facing the board, foaming a foamable hardenable liquid resin in place between each pair of adjacent ribs, and applying hardenable liquid resin over the ribs and foam. A glass fiber reinforced outer jacket for insulation is formed on and removed from the first mold. A second mold is made similarly to the first but using semicircular ribs of a relatively small radius. The outer jacket is mounted on the second mold and the space therebetween has foamable hardenable liquid resin inserted therein to form a jacketed longitudinally curved semicircular section of foamed resin pipe insulation.

REFERENCES:
patent: 2724868 (1955-11-01), Kish
patent: 2755510 (1956-07-01), Rauter
patent: 3072971 (1963-01-01), Kish
patent: 3141053 (1964-07-01), Terry
patent: 3247549 (1966-04-01), Kolt
patent: 3248758 (1966-05-01), Schmitz et al.
patent: 3723585 (1973-03-01), Nussbaum
patent: 4073049 (1978-02-01), Lint

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