Method and device for drainage of a fibrous suspension
AssigneeVoith Sulzer Papiertechnik Patent GmbH
InventorAxel Gommel
Life of this patent
Estimating the term…
Abstract
A method and device for drainage of a fibrous suspension where a converging drainage gap is formed between a first area and a second area. At least one of the first area or the second area is water permeable. A curved drainage zone is connected to the converging drainage gap. The first area moves relative to the second area. A fibrous suspension is introduced into the converging drainage gap. The fibrous suspension is transported by one of the first area and the second area as a layer. The first area and the second area are compressed closer together thereby causing drainage from the fibrous suspension through one of the first area or the second area.
Claims38
A method for drainage of a fibrous suspension comprising:
- forming a converging drainage gap between a first water permeable area and a second water impermeable area the second water impermeable area having a smooth surface so that the fibrous suspension slides along the smooth surface, the converging drainage gap including a curved drainage zone;
- moving the first area relative to the second area in a direction of motion;
- and
- introducing a fibrous suspension into the converging drainage gap, the fibrous suspension being transported by the first area as a layer.
A method for drainage of a fibrous suspension comprising:
- forming a converging drainage gap between a first water permeable area and a second water impermeable area having a smooth surface, the converging drainage gap including a curved drainage zone;
- moving the first area relative to the second area in a direction of motion;
- and
- introducing a fibrous suspension into the converging drainage gap, the fibrous suspension being transported by the first area as a layer,
- where a second suspension is added such that at least one additional point for adding the second suspension passes through the second area.
A method for drainage of a fibrous suspension comprising:
- forming a converging drainage gap between a first water permeable area and a second water impermeable area having a smooth surface, the converging drainage gap including a curved drainage zone;
- moving the first area relative to the second area in a direction of motion;
- and introducing a fibrous suspension into the converging drainage gap, the fibrous suspension being transported by the first area as a layer,
- draining a majority of a filtrate radially from the drainage zone, wherein the filtrate penetrating through the first area is divided into at least a first filtrate, which appears first in the direction of motion, and into a second filtrate;
- and
- applying, at an addition point, at least a part of the first filtrate onto a layer of pulp already formed in the converging drainage gap.
A device for drainage of a fibrous suspension comprising:
- a first area, said first area being water permeable and moving in a direction of motion;
- a second area having a smooth surface, said second area being impermeable to water, said second area and said first area forming a converging drainage gap that includes a curved drainage zone in which the fibrous suspension is adapted to slide along said smooth surface, said second area being one of moving slower than said first area and being stationary;
- and
- a headbox, said headbox introducing a fibrous suspension into the converging drainage gap, the fibrous suspension being transported in the direction of motion as a layer by said first area, thereby causing drainage from the fibrous suspension.
Dependencies are inferred from the claim text.