D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 27/30 (2006.01) B32B 5/26 (2006.01) B32B 29/00 (2006.01) D21H 17/52 (2006.01) D21H 17/53 (2006.01) D21H 17/57 (2006.01) D21H 25/06 (2006.01)
Patent
CA 2120524
2120524 9307337 PCTABS00021 Polyurea-reinforced fiber-based materials, and methods for their manufacture, are disclosed. A representative material is a sheetlike ply having on one or both faces thereof a polyurea-impregnated stratum. When the material has only one such stratum, the stratum has a thickness extending depthwise into the ply no greater than about half the ply thickness dimension. When the material has two such strata (one on each face), each stratum has a thickness no greater than about one-third the ply thickness dimension. In either case, a portion of the ply thickness dimension is unimpregnated. The material can comprise plural superposed plies, such as reinforced corrugated paperboard wherein at least one ply, such as the corrugated medium, has at least one polyurea-impregnated stratum. The present materials have, at a given compression strength, less brittleness (more foldability) than prior-art materials. The present materials are made by controllably applying a polyisocyanate resin to a fibrous web surface so as to prevent excess penetration of the resin into the web thickness dimension, then curing the resin. The materials are capable of being corrugated and folded after curing, and are useful for manufacturing cartons and other finished products.
Oyen Wiggs Green & Mutala Llp
Weyerhaeuser Company
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