公开(公告)号：US20230313466A1

公开(公告)日：2023-10-05

申请号：US18012476

申请日：2021-06-23

Applicant: SAPPI Netherlands Services B.V.

Inventor： Gustavo DUARTE ,  Vera LOURENCO ,  Mario HOLZLECHNER ,  Jo SIMONS

IPC: D21H21/16 ,  D21H21/38 ,  D21H19/12 ,  D21H19/08 ,  D21H19/82 ,  D21H27/10 ,  B65D65/42

CPC classification number: D21H21/16 ,  D21H21/38 ,  D21H19/12 ,  B65D2565/387 ,  D21H19/824 ,  D21H27/10 ,  B65D65/42 ,  D21H19/08

Abstract: A process for improving the barrier properties of a barrier layer in a pulp-based substrate layer having a barrier layer, comprising the steps of providing a pulp-based substrate layer having a layer of an aqueous barrier composition applied to it, and then drying the pulp-based substrate layer having a layer of aqueous barrier composition applied to it to form a pulp-based substrate layer having a barrier layer, such that the moisture content of the pulp-based substrate layer having a barrier layer is below 2.5% by weight, preferably below 2% by weight, based on the weight of the pulp-based substrate layer having a barrier layer.