Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1994-12-01
1996-04-02
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162193, 1623602, 162286, 1623603, D21F 302
Patent
active
055037160
ABSTRACT:
The invention relates to a device in a paper machine for guiding a web and in particular in guiding a leader of the web. The device operates in a paper machine in the area between a center roll of the press section and a separate press nip in the press section. The separate press nip is formed between a smooth-faced upper roll and a hollow-faced lower roll. Around this lower roll, a lower felt of the separate press is placed and runs from a suction-transfer roll placed at the proximity of the center roll as a straight run into the separate press nip. At the initial end of the straight run of the felt of the separate press nip, in connection with the guide roll, air-transfer devices are arranged, by whose means a reduced pressure is produced at least across the width of the leader in connection with a closing inlet nip between the felt and the leader and/or in connection with an opening outlet nip defined between the guide roll and the straight run of the felt.
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D. McDonald et al. "A New Web Transfer System For Closing The Draw Between Last Press And Dryer Section" CPPA Annual Meeting 1990.
Hirsimaki Martti
Kivimaa Juha
Hastings Karen M.
Valmet Paper Machinery Inc.
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