Stock material or miscellaneous articles – Sheet including cover or casing – Complete cover or casing
Patent
1978-06-13
1980-12-30
Anderson, Philip
Stock material or miscellaneous articles
Sheet including cover or casing
Complete cover or casing
181284, 181288, 181294, 181DIG1, 264 464, 264255, 264271, 428160, 428310, 428315, B32B 520, B32B 2706, B29D 2704
Patent
active
042423910
ABSTRACT:
A noise barrier pad and a method for the production of same comprises the steps of forming a tread layer by reacting a mixture for polyurethane foam in a hollow mold having separable upper and lower parts and which is shaped so as to form the tread layer, curing the foam, removing the upper part of the mold, placing a blank of noise barrier material on the surface of the foam which corresponds to the bottom side of the tread layer, and forming a bottom foam layer on the tread layer and barrier material by placing another upper mold constructed in accordance with the bottom layer of the noise barrier pad and defining a cavity over the tread layer and barrier material and filling the cavity with the reaction mixture for the polyurethane foam.
REFERENCES:
patent: 2845997 (1958-08-01), Waite
patent: 3534129 (1970-10-01), Bartel
patent: 3534828 (1970-10-01), Iver et al.
patent: 3762489 (1973-10-01), Proksch et al.
patent: 3796277 (1974-03-01), Gordon
patent: 3840627 (1974-10-01), Rhodes
patent: 4120376 (1978-10-01), Palmer
Reinhardt Hans
Schmahl Manfred
Tritsch Armin
Anderson Philip
Freudenberg Carl
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