Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1996-07-23
1998-06-16
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162300, 162315, 162317, 162351, D21F 100
Patent
active
057664196
ABSTRACT:
A twin-wire gap former in a paper machine in which an outer wire and an inner wire are guided by guide rolls and by web forming members. The wires form a twin-wire zone which starts from a forming gap into which a slice part of a headbox feeds a stock suspension jet. The forming gap is followed by a curved portion of the twin-wire zone which is guided by a first forming roll placed inside the loop of one of the wires. The forming-gap arrangement includes two opposite tip plates which define a slice channel between them. The lip plates extend deep into the forming gap so that the free ends of the lip plates are placed in direct vicinity of the forming wires or in contact with the wires. On the curve sector of the twin-wire zone, which starts after the forming gap and which is guided by the first forming roll, inside the loop of one of the wires, a water drainage box is provided, at which box the edges of the sides that are placed against the inner face to the wire are substantially sealed. The water drainage box is connected to devices which regulate the pressure/pressures in the space or spaces placed in the interior of the box and are filled with water. Then, the drainage of water is controlled both in the forming gap and on the curve sector following after the forming gap.
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Linsuri Ari
Verkasalo Lauri
Hastings Karen M.
Valmet Corporation
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