CELLULOSIC WEB WITH A PERMEANT BARRIER OR CONTAMINANT TRAP

摘要

Nonwoven cellulosic fiber webs including, paperboards and corrugated paperboard, etc., are described containing a barrier layer (250) that can ac t both as a barrier to the passage of a permeant and as a trap for contaminant materials that can arise in new materials or from the recycle of fiber in th e manufacture of paperboard. The effective material which acts as a trap or barrier is a cyclodextrin compound, substantially free of an inclusion compl ex compound. The cyclodextrin barrier layer (250) can be corrugated or sheet laminated with or on the cellulosic web (240). Alternatively, the cyclodextr in material can be included in a coating composition that is coated (210) on th e surface or both surfaces of the cellulosic web (240) after web formation. Further, the cyclodextrin material can be included in a thermoplastic film that can be used as one layer in a bilayer or multilayer laminate containing a cellulosic web (240).