发明名称 |
TWIN-WIRE WEB FORMER IN A PAPER MACHINE |
摘要 |
A twin-wire web former in a paper machine includes a covering wire and a carrying wire defining a forming zone, at the beginning of which zone there is a forming gap into which the discharge opening of a headbox feeds a pulp suspension jet. A first forming roll is located on the twin-wire zone, in the area of the forminggap, on which the twin-wire zone is curbed within a certain sector, followed by a dewatering unit(s), which is in turn followed by a second forming roll(s) in the twin-wire zone. Thereafter, the web is detached from the covering wire and passed on the carrying wire to a pick-up point. Between the first forming roll and the second forming roll(s), a dewatering unit(s) is provided which comprises a press-support unit which guides the wire that enters into contact with the unit as a straight run. The dewatering unit(s) also includes a dewatering equipment facing the press-support unit and provided with suction and foil equipment for removing a substantial amount of water out of the web. The magnitude of the twin-wire turning sector placed in connection with the first forming roll is within the range of from about 5.degree. to about 120.degree..
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申请公布号 |
CA2050844(C) |
申请公布日期 |
1996.03.26 |
申请号 |
CA19912050844 |
申请日期 |
1991.09.06 |
申请人 |
VALMET PAPER MACHINERY INC. |
发明人 |
KOIVURANTA, MAURI;ODELL, MICHAEL;PARTANEN, ERKKI;VERKASALO, LAURI |
分类号 |
D21F9/00;(IPC1-7):D21F1/00 |
主分类号 |
D21F9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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