Method for protective film lamination with curl control

Details Method for protective film lamination with curl control Method for protective film lamination with curl control

1976-08-04

1978-01-17

Drummond, Douglas J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156322, 156324, B29C 1902, B65C 925

Patent

active

040690814

ABSTRACT:
A method for controlling curl in laminating a protective film having a heat-softenable adhesive surface onto a relatively flexible substrate document, in which the adhesive surface of the film is heated, the film and the substrate are then passed between two pressure rolls, and the laminate thus formed is maintained in contact with the pressure roll that engages the substrate through an appreciable arcuate distance after the laminate clears the other pressure roll to control longitudinal curl. The pressure rolls engaging the substrate and the film may be of convex and concave configuration, respectively, to minimize transverse curl. Radiant heating is preferably employed, together with limited pigmentation in the adhesive portion of the film.

REFERENCES:
patent: RE9905 (1881-10-01), Palmer
patent: 2361527 (1944-10-01), Bacon
patent: 3108034 (1963-10-01), Hannon
patent: 3180778 (1965-04-01), Rinderspacher et al.
patent: 3322593 (1967-05-01), Conti
patent: 3574031 (1971-04-01), Heller, Jr. et al.
patent: 3660190 (1972-05-01), Stroszynski
patent: 3901758 (1975-08-01), Humphries
patent: 3959567 (1976-05-01), Bradley
patent: 3976528 (1976-08-01), James

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