Abstract: A hydraulic control device for an industrial machine, which can efficiently control a high flow rate of a pressure oil by a simple hydraulic instrument configuration, is provided.

Abstract: In a twin wire former, white-water withdrawal means (20) for withdrawing white water (15) dewatered to the opposite side of a roll is arranged to the upstream side of a pressure element (30) to suppress the interference of the dewatered white water (15) with the pressure element (30). This renders it possible to prevent damage to the pressure element (30) that is caused by a collision with white water (15) during dewatering and to manufacture defect-free paper that has even dispersion of fibers.

Abstract: A paper former comprises two wires which converge for defining a paper production gap and a plurality of dewatering blades arranged in the paper production gap in a paper producing direction and brought into sliding contact with one of the two wires so that a stock is dehydrated while being conveyed in a state put in the paper production gap. Each of the plurality of dewatering blades is shaped into a convexly curved surface configuration bent along a traveling direction of the wires and equipped with a wire sliding contact surface brought into sliding contact with said wire for guiding the traveling of said wire, and grooves are made in said wire sliding contact surfaces as a moisture run-off opening for running off moisture developing through the dewatering from the wire side. This paper former thus constructed can suppress the occurrence of paper defects stemming from the landing of a material jet or paper defects stemming from the dewatering property, thus improving the paper quality.

Abstract: A paper former comprises two wires which converge for defining a paper production gap and a plurality of dewatering blades arranged in the paper production gap in a paper producing direction and brought into sliding contact with one of the two wires so that a stock is dehydrated while being conveyed in a state put in the paper production gap. Each of the plurality of dewatering blades is shaped into a convexly curved surface configuration bent along a traveling direction of the wires and equipped with a wire sliding contact surface brought into sliding contact with said wire for guiding the traveling of said wire, and grooves are made in said wire sliding contact surfaces as a moisture run-off opening for running off moisture developing through the dewatering from the wire side. This paper former thus constructed can suppress the occurrence of paper defects stemming from the landing of a material jet or paper defects stemming from the dewatering property, thus improving the paper quality.

Abstract: In order to render a twin wire former for a paper machine more applicable to an appropriate dewatering pressure state with respect to widely used paper formation conditions, there is provided a dewatering device including a plurality of dewatering blades that face a gap for paper formation through the wires constituting closed loops. The dewatering blades comprise a pressure adjustment unit for operating the dewatering blades in a direction close to or away from a wire and an angle adjustment unit for swinging the dewatering blades in a wire running direction, which are operationally associated with each other. The angle formed between an active plane of the dewatering blades and the wires is externally adjustable by the angle adjustment unit.