D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/14.1
D21F 1/36 (2006.01) D21F 9/00 (2006.01) D21F 9/02 (2006.01) D21F 11/04 (2006.01)
Patent
CA 1076862
ABSTRACT OF THE DISCLOSURE: A method and an apparatus for manufacturing a multi- layer board which includes an outer web bonded to a base web has the features of initially forming the outer web on a planar section of a single wire where through a suitable structure a first dewatering stage of the web on the single wire is provided, a second dewatering stage being provided by way of a suitable dewatering shoe subsequent to the first dewatering stage with this second dewatering stage having an initial portion where dewatering takes place simultaneous in opposite directions and a final portion where dewatering takes place only outwardly away from the first wire. A second wire cooperates with the first wire at the second dewatering stage to provide a twin- wire web formation while forming a first sandwich structure which includes the first and second wires and the web there- between, this first sandwich structure being guided along a convexly curved surface of the dewatering shoe at the second stage of dewatering and then being guided around a forming roll where additional dewatering takes place in a third dewatering stage. This first sandwich structure is guided tangentially from the forming roll and at a location beyond the latter the second wire is detached from the web while the first wire with the web adhering thereto travels to a solidification zone where a third wire which carries the base web is joined to the first wire with the outer web adhering thereto, the latter webs being pressed against each other at the solidifica- tion zone while a suitable structure cooperates with the first and third wires to urge toward each other at the solidification zone.
302172
Kankaanpaa Matti
LandOfFree
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