Mitsubishi Jukogyo Kabushiki Kaisha

Kazuhide Sakamoto

Takashi Bando

Hiromu Masuda

Hiroshi Iwata

Hiroyuki Fuchioka

A twin wire former of a paper machine can perform dewatering gently and symmetrically on the front and back sides of the wet paper, thereby producing paper with good yield and excellent front/back similarity. The twin wire former includes the loops of two wires, and first, second and third dewaterers, having large radii of curvature and disposed inside one and the other of the loops of the wires sequentially alternately between a point where a raw material jet alights on the wires and a couch roll, and the wire-run over this section is diagonal. The first and third dewaterers are disposed inside the loop of the wire and the second dewaterer is disposed inside the loop of the wire. This second dewaterer is pivotable about a point in the vicinity of its rear end, and the couch roll is a solid roll. This couch roll, a transfer suction box and the third dewaterer are mounted on a swing arm and can be pivoted for wire installation.

Twin wire former of paper machine

A dewatering instrument of a twin-wire former allows the angles at which the wires are wrapped around the dewatering blades to be adjusted even during operation so that pulsating pressure applied to the paper stock may be set appropriately according to the prevailing paper making condition. The respective dewatering blades of the dewatering instrument are supported by two support bodies, the first one of which is fixed and pivotably supports the blade, and the second one of which is movable to pivot the blade about the first. For example, the second support body may be a flexible tube which is inflatable and deflatable. When the blade is pivoted, the attitude of the land of the blade is changed so that the wrap angles of the wires with respect to the land of the dewatering blade are adjusted.

Dewatering instrument for a paper machine twin-wire former

In a twin-wire former in a paper machine, an operation of a hybrid former mode and that of a gap former mode are conducted, and papers of quality conforming to the kind of papers can be made in a wide range of basis weight with regard to multiple kinds of papers. In the twin-wire former, a forming roll, which guides a top wire so that it can approach to a bottom wire to pinch the stock of paper and run approximately horizontally, is made adjustable in an up and down direction. Upper surfaces of blades of a forming board and a forming shoe provided inside a loop of the bottom wire, are upwardly convex so that dewatering can be effected mainly downward.

Growing community of inventors

Mihara, Japan

Kazuhide Sakamoto