公开(公告)号：US11512431B2

公开(公告)日：2022-11-29

申请号：US16910242

申请日：2020-06-24

Applicant: Valmet Technologies Oy

Inventor： Juan Cecchini ,  Juha Kivimaa ,  Kari Lamminmäki ,  Antti Poikolainen

IPC: D21F11/04 ,  D21F9/00 ,  D21F9/02

Abstract: The invention relates to a method for forming a three-layer board web, preferably a folding box board (FBB) or a solid bleached (sulfate) board (SBS), in a forming section (300) comprising a multilayer headbox (100) and a forming unit (200). In the method the layers of the three-layer board web are first formed of pulp suspension in the multilayer headbox (100) and fed to only one forming unit (200), a gap former where the pulp suspension from the multilayer headbox is fed to a gap between lower and upper wires for water removal and for joining the layers of the three-layer board web and where water is first removed by a non-pulsating forming shoe (37, 39).