Method for forming foamed parts and a multiple layer release adh

Details Method for forming foamed parts and a multiple layer release adh Method for forming foamed parts and a multiple layer release adh

1988-07-28

1990-11-27

Simmons, David

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156245, 156249, 264 465, 264 466, 428 31, 428 40, B32B 3112

Patent

active

049733710

ABSTRACT:
A process for molding foam products from foam precursors reacted in a mold cavity formed in part by a mold lid and which is covered by a double layer cover to maintain the surface of the lid clean during the foaming process comprising the steps of: providing a double layered cover having four working surfaces; adhering one of the working surfaces to the lid and thereafter closing the tool lid and foaming the part. The lid is opened and the cover and foam part are separated from the mold. The lid is separated from the double layer cover and foam part at a working surface of low strength adhesive; a release sheet of the cover is separated at two other working surfaces to expose a high strength adhesive for connecting the foam part to another member. The double layer cover used for practicing the process includes a foam layer adapted to have one surface thereof bonded to foam material and including a high strength adhesive backing thereon. A release sheet layer is formed on the high strength adhesive and remains thereon until a foam part is separated from the mold. The release sheet further includes a low strength adhesive on the exposed surface thereof which is adapted to be connected to the mold lid to prevent foam material build up without use of release agent coatings.

REFERENCES:
patent: 2956310 (1960-10-01), Roop et al.
patent: 3533899 (1970-10-01), Kapral
patent: 3787546 (1974-01-01), Pratt et al.
patent: 3895154 (1975-07-01), Kapral
patent: 4165999 (1979-08-01), Egner
patent: 4207017 (1980-05-01), Hefele
patent: 4546022 (1985-10-01), Madonia et al.
patent: 4673542 (1987-06-01), Wigner et al.

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