Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-02-07
1990-08-21
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
53451, 156218, 1563084, 156466, 493197, 493269, 493302, B29C 5300
Patent
active
049503456
ABSTRACT:
A back-up pad is provided over an anvil surface of a back-up plate, and between the anvil surface and a sealing surface of a sealing die, in an apparatus for forming seals between layers of film material. The back-up pad has a slip surface on one side thereof and a spring surface on an opposite side thereof, the slip surface opposing the sealing face of the die so that the layers of film material pass between the sealing die and the back-up pad during seal formation. The spring surface is comprised of a plurality of outwardly extending resilient spring loops that act against the back-up plate during seal formation, the spring loops resiliently urging the layers of film material against the sealing face to effect seal formation between the film layers while cushioning the film layers to prevent damage to the film layers due to drag between layers and the die face.
REFERENCES:
patent: 3042103 (1962-07-01), McDevitt et al.
patent: 3935048 (1976-01-01), Rucker
patent: 4529471 (1985-07-01), Vaughan
Kreager, Jr. William D.
Priggs Fredrick J.
Reaves Jerry M.
Frito-Lay Inc.
Gallagher John J.
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