Method and apparatus for producing plastic foam boardstock and p

Details Method and apparatus for producing plastic foam boardstock and p Method and apparatus for producing plastic foam boardstock and p

1977-05-27

1978-10-24

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

264 462, 427369, 427373, B32B 3112

Patent

active

041219570

ABSTRACT:
A pour urethane foam mixture is deposited on a thin porous non-woven fiberglass mat through which it is driven by an eccentric hexagonal beater bar. The space below the mat is limited by a second mat through which the uncured foam mixture penetrates to a lesser extent. The foam-penetrated pair of mats are led through an oven which accelerates curing of the urethane into reinforced boardstock having a precise thickness, a smooth upper surface and a uniform bottom surface that is cast onto a release surface or bonded to a flexible backing sheet such as paper or rigid substrate.

REFERENCES:
patent: 2648619 (1953-08-01), Alderfer
patent: 2677008 (1954-04-01), Fairclough et al.
patent: 2841515 (1958-07-01), Runton
patent: 3196030 (1965-07-01), Petry

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