Process for applying microcapsule-containing compositions to pap

Details Process for applying microcapsule-containing compositions to pap Process for applying microcapsule-containing compositions to pap

1990-02-23

1991-09-17

Lusignan, Michael

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

427359, 427365, 427428, B05D 312

Patent

active

050494201

ABSTRACT:
Microcapsules are applied in metered quantity to a paper web passing through an ingoing nip between a hard applicator roll and a soft backing roll. Metering is achieved by means of a deformable metering roll in adjustable pressure contact with the applicator roll and rotating in an opposite sense thereto to define an ingoing nip. Coating composition is fed to this nip from a pipe or by the roll dipping into a bath of coating composition. The metered coating emerging from the metering nip is re-distributed and smoothed by a deformable smoothing roll rotating in the same sense as the applicator roll and in contact therewith. The process facilitates application of relatively high solids microcapsule compositions at low wet coatweights.

REFERENCES:
patent: 2398844 (1946-04-01), Muggleton et al.
patent: 3186861 (1965-06-01), Smith et al.
patent: 3684561 (1972-08-01), Labombarde
patent: 3830199 (1974-08-01), Saito et al.
patent: 4198446 (1980-04-01), Goetz
Coating Equipment and Processes, George L. Booth, 1970, pp. 168-169.
"The Dahlgren Liquid Application System (LAS)", M. Bridges, Paper Industry Technical Association Conference held Oct. 1983, pp. 123-141.
"The Combined Locks Wet End Coating Process", J. F. Whalen, 1965, TAPPI Monograph, pp. 9-13.
"Reverse Roll Coating", G. L. Booth, TAPPI Monograph, pp. 69-73.
"Roll Coating", Pulp & Paper, 3rd Edition, vol. 4, Casey, pp. 2137-2147.
"Capabilities of the Dahlgren Liquid Application System", Dahlgren Mft. Co., 1981.

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