D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 13/00 (2006.01) D21F 11/04 (2006.01)
Patent
CA 2066812
ABSTRACT OF THE DISCLOSURE METHOD AND APPARATUS FOR THE PRODUCTION OF MULTIPLY CELLULOSIC BOARD AND PRODUCT OBTAINED THEREBY A method and apparatus for the production of multiply cellulosic fiber board wherein first and second streams of cellulo5ic pulp are deposited on a wire, partly dewatered, mechanically integrated and conditioned to form a bilayered web, followed by thc deposition of a third stream of cellulosic pulp onto the top of the bilaycred web and further dewatering in a flow direction opposite the di.rec- tion of flow of the dewatering of the bilayered web to hydraulically integrate and form a trilayered web. Prefera- bly, the total quantity of fibers contAincd in the seconc1 (inner) layer is greater than the quantity of fibers in either the first or third outer layer, thereby developing a board product that exhibits an appareIlt bulk at least equal to the apparent bulk of a single layer board formed from the same quantity of fibers, but containing between about 9% and 11% fewer fibers than such single layered board. The novel product exhibits substantially improved physical and other properties,especially stiffness. Coating of the board with a polymer and formation of the coated board into liquid containers is disclosed. U.S. APPLICATION SERIAL NO. 071690,518
Gowling Lafleur Henderson Llp
International Paper Company
Self R. Wayne
LandOfFree
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