公开(公告)号：US11299857B2

公开(公告)日：2022-04-12

申请号：US16601171

申请日：2019-10-14

Applicant: Valmet Technologies, Inc.

Inventor： Reijo Pietikäinen ,  Antti Poikolainen ,  Juan Cecchini ,  Teuvo Virkkunen

IPC: D21H27/34 ,  D21F9/00 ,  D21H21/16 ,  D21H23/48

Abstract: A method for forming a multi-ply fiber web in which least part of the sizing of the multi-ply fiber web is provided by applying sizing agent in the form of foam by a curtain type application device (C10, C20) in between at least two layers of the multi-ply fiber web in the forming section. The invention also relates to a forming section for a multi-ply fiber web having at least one twin-wire forming part formed between a wire (10) for the bottom layer and a wire (20) for the top layer of the multi-ply fiber web, where the layers are joined, and the treated layers combined. The forming section has a curtain type application device (C10, C20) for applying sizing agent in the form of foam in between two layers of the multi-ply fiber web in the forming section of a multi-ply fiber web production line.