发明名称 Press section with an equalizing nip in a paper machine
摘要 A press section of a paper machine through which a paper web has a substantially closed and supported draw including an extended-nip zone and an equalizing-nip zone following the extended-nip zone in the running direction of the web. In the equalizing-nip zone, the asymmetry of roughness is equalized that was formed in the web to be pressed in the preceding press nip or nips, while not dewatering the web to a substantial extent. The extended-nip zone and the equalizing-nip zone are formed between three press components which are interconnected in a compact way so that the extended nip is formed by a press component provided with a flexible mantle together with a press roll provided with a rigid mantle. The press roll with the rigid mantle also forms the equalizing-nip zone together with a smooth-faced equalizing-press roll. After the equalizing-nip zone, the web has at least one free draw or runs on a transfer fabric, on which draw(s) or run, by a difference in speed, the stretch of the web in the machine direction, taking place in the equalizing-press nip is compensated for and the web is kept appropriately tensioned.
申请公布号 US5849156(A) 申请公布日期 1998.12.15
申请号 US19970876147 申请日期 1997.06.13
申请人 VALMET CORPORATION 发明人 VALLIUS, OIVA
分类号 D21F3/02;D21F3/04;(IPC1-7):D21F3/00 主分类号 D21F3/02
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