Patent Number: 6,309,511

Title: Dewatering instrument for a paper machine twin-wire former

Abstract: A dewatering instrument for a paper machine twin-wire former for improving the fiber dispersion performance while avoiding the decrease in strength of formed paper in its thickness directions. In the dewatering instrument, dewatering inhibiting blades have plane sections for supporting a wire and inclined surfaces for defining wedge-shaped spaces spreading out toward the upstream side in the wire traveling direction with respect to a wire plane formed on a wire entry side of the plane sections. Angles (wedge-angles) between the inclined surfaces and the wire are set to become sequentially smaller as a whole in proportion as the dewatering inhibiting blades are positioned on the further downstream side in the flowing direction of a paper raw material liquid. Or, the dimensions of the wedge-shaped spaces defined between the inclined surfaces and the wires are made to become sequentially larger as a whole in proportion as the dewatering inhibiting blades are positioned on a further downstream side in the flowing direction of a paper raw material liquid. With the configurations of the dewatering inhibiting blades, the dewatering pressure peak value increases in accordance with advancing toward the downstream.

Inventors: Iwata; Hiroshi (Hiroshima-ken, JP), Masuda; Kazuhiko (Hiroshima-ken, JP)

Assignee: Mitsubishi Heavy Industries, Ltd.

International Classification: D21F 1/48 (20060101); D21F 9/00 (20060101); D21F 001/54 ()

Expiration Date: 10/30/2018