Apparatus for introducing a foamable plastic insulation into the

Details Apparatus for introducing a foamable plastic insulation into the Apparatus for introducing a foamable plastic insulation into the

1980-12-08

1985-06-11

Anderson, Philip

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

249 91, 264 465, 264 467, 264 469, 425123, 425256, 425817R, 425DIG29, B29D 2704

Patent

active

045225788

ABSTRACT:
This invention relates to insulated pipe and methods and apparatus for making the same. There has been difficulty in placing foamable insulating materials in the narrow elongated space between a casing pipe and a core pipe. According to the instant invention, a miniaturized mix head is inserted in this elongated space. Constituents of the foamable insulating material are simultaneously mixed and disseminated by the mix head in a manner to create a moving foam front which displaces air within the elongated space and permits the formation of a layer uniform, low density insulating material therein.

REFERENCES:
patent: 3090078 (1963-05-01), Ackles
patent: 3311948 (1967-04-01), Akelsonn
patent: 3439075 (1969-04-01), Bauer et al.
patent: 3444279 (1969-05-01), Dost
patent: 3491171 (1970-01-01), French
patent: 3876145 (1975-04-01), Gusmer et al.
patent: 3950461 (1976-04-01), Levens
patent: 4051209 (1977-09-01), Tabler
patent: 4073841 (1978-02-01), Dultgen et al.
patent: 4138454 (1979-02-01), Harmon et al.
"The Encyclopedia of Patent Practice and Invention Management," Robert Calvert, Edt., New York, Reinhold, .COPYRGT.1964, p. 138.

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