Baspappförpackningsstruktur omfattande en kolloidal kopolymerer för förbättrande av holdouten

摘要

This invention relates to the use of a single "hold-out" coating layer applied by the paper machine on the press-applied barrier side of a paperboard substrate. It more particularly relates to a substrate for paperboard packaging comprising : a first layer of particulate minerals (4); a paperboard layer (6) located interior to said first layer of particulate minerals (4); a second layer of particulate minerals (8) including a colloidal copolymer for improving holdout located interior to said paperboard layer (6) ; and a barrier layer (10) located interior to said second layer of particulate minerals (8); and to a method for producing such a substrate. Such structures of this type, generally, allow paper machines with only one coater on the barrier side to apply a sufficient coating for the desired holt-out.