Twin-wire former
First Claim
1. A twin-wire former in a paper machine including two forming wire loops, which define between themselves a twin-wire zone, and at least one dewatering box, which is located inside one of the wire loops to remove water through said wire from a web being formed, and at least one loading blade, which is located opposite to the dewatering box inside the other wire loop in contact with the other wire, which dewatering box includes at least three successive dewatering zones, wherein every second zone of the dewatering box has a vacuum and every second zone is vacuum-free, and the loading blade or blades is/are placed inside one of the wire loops at a location where it or them is/are opposed by a vacuum-free zone, which is preceded and followed by a vacuum zone.
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Accused Products
Abstract
A twin-wire former in a paper machine has two forming wire loops (10, 20), which define between themselves a twin-wire zone. At least one dewatering box (30) is located inside one of the wire loops (10, 20) to remove water through the wire from a web (W) being formed. At least one loading blade (40) is located opposite the dewatering box (30) inside the other wire loop (20; 10) in contact with the other wire. The dewatering box (30) includes at least three successive dewatering zones (30a, 30b) in which every second zone (30a) has a vacuum (p) and every second zone (30b) is vacuum-free. The at least one loading blade (40) is placed inside one of the wire loops (20; 10) at a location where it is opposed by a respective vacuum-free zone (30b), which is preceded and followed by a vacuum zone (30a).
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Citations
21 Claims
- 1. A twin-wire former in a paper machine including two forming wire loops, which define between themselves a twin-wire zone, and at least one dewatering box, which is located inside one of the wire loops to remove water through said wire from a web being formed, and at least one loading blade, which is located opposite to the dewatering box inside the other wire loop in contact with the other wire, which dewatering box includes at least three successive dewatering zones, wherein every second zone of the dewatering box has a vacuum and every second zone is vacuum-free, and the loading blade or blades is/are placed inside one of the wire loops at a location where it or them is/are opposed by a vacuum-free zone, which is preceded and followed by a vacuum zone.
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8. A twin-wire former in a paper machine, the former comprising:
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a first forming wire loop;
a second forming wire loop, wherein portions of the first forming wire loop and the second forming wire loop extend adjacent one another to define a twin-wire zone;
at least one dewatering box located inside the first forming wire loop, to remove water through the first forming wire loop from a web being formed, the at least one dewatering box having a first zone, a second zone downstream of the first zone, and a third zone downstream of the second zone, the first zone and the third zone having vacuum applied thereto, and the second zone having no vacuum applied thereto; and
at least one loading blade, which is located opposite to the at least one dewatering box inside the second wire loop, the at least one loading blade being in contact with the second wire loop at a location opposed by the second zone, such that the at least one loading blade is positioned such that it is preceded and followed by zones of the at least one dewatering box having vacuum applied thereto. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21)
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15. A twin-wire former in a paper machine, the former comprising:
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a first forming wire loop;
a second forming wire loop, wherein portions of the first forming wire loop and the second forming wire loop extend adjacent one another to define a twin-wire zone;
at least one dewatering box located inside the first forming wire loop, to remove water through the first forming wire loop from a web being formed, the at least one dewatering box having at least three successive zones arranged in the twin-wire zone, wherein the zones alternate between being a vacuum zone and being a vacuum-free zone; and
at least one loading blade, which is located opposite to the at least one dewatering box inside the second wire loop, the at least one loading blade being in contact with the second wire loop at a location opposed by one of the vacuum zones, such that the at least one loading blade is positioned such that it is preceded and followed by zones of the at least one dewatering box having vacuum applied thereto.
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Specification