Method of making foam pipe insulation including controlling rate

Details Method of making foam pipe insulation including controlling rate Method of making foam pipe insulation including controlling rate

1976-06-23

1978-02-28

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling rate of movement of molding material or its...

264 462, 264 466, 264 467, 264146, 264157, 264173, B29D 2300, B29D 2704

Patent

active

040767817

ABSTRACT:
The method includes use of a stationary hollow mandrel supported at one end, a pair of forming shoes over which strips of material are respectively pulled longitudinally of the mandrel to provide a cylindrical inner liner surrounding the mandrel and a cylindrical outer jacket surrounding the inner liner in spaced relationship thereto, a conduit having an outlet end portion disposed within the outer jacket above the inner liner, supply means for supplying foamable hardenable exothermic reacting liquid material to an inlet end portion to the conduit, additional supply means for separately supplying a fast acting catalyst to the foamable material in the conduit, means for reciprocating the outlet end portion of the conduit transversely over the inner liner, conveyor-mold means confining the outer jacket as the foamable foams and cures, rotatable tire means for pulling the insulation formed by the outer jacket, the cured foam, and the inner liner off the mandrel longitudinally thereof, a traveling saw for cutting the insulation into predetermined lengths, a slitting saw for slitting the tubular insulation longitudinally, and an infrared sensor for controlling the speed of two motors respectively driving the conveyor-mold means and the rotatable tire means in accordance with the sensed temperature of the exothermic reaction of the foamable hardenable liquid material.

REFERENCES:
patent: 3122785 (1964-03-01), Weinbrenner et al.
patent: 3245261 (1966-04-01), Buteux et al.
patent: 3265786 (1966-08-01), Voelker
patent: 3417168 (1968-12-01), Keith
patent: 3816043 (1974-06-01), Snelling et al.
patent: 3837771 (1974-09-01), Kolakowski et al.

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