Combination comprising the press section and the initial part of

Details Combination comprising the press section and the initial part of Combination comprising the press section and the initial part of

1990-04-24

1991-11-12

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Running or indefinite length product forming and/or treating...

1623601, 34117, D21F 300

Patent

active

050645030

ABSTRACT:
The combination of the press section and the initial part of a multi-cylinder drying section in a paper making machine wherein the press section comprises a compact press roll arrangement, whose rolls (16, 18, 20, 21) form press nips (N.sub.1, N.sub.2, N.sub.3) with one another. The press section further comprises a separate press, whose press rolls (30, 31) form a press nip (N.sub.4). The drying section of the combination comprises a multi-cylinder dryer comprising different cylinder groups (25, 39). Between the compact press roll arrangement and the separate press, a group of pre-drying cylinders (25) is fitted, said group being provided with a single-wire draw of the web (W) so that the upper cylinders (25a, 25b, 25c) in the group (25) of pre-drying cylinders remain outside the loop of the drying wire (26), which accomplishes the single-wire draw. The web (W) is passed from the center roll (20) of the compact press section on the drying wire (26) substantially as a closed draw onto the press felt ( 33) of the separate press, the felt being fitted as the lower felt in the separate press.

REFERENCES:
patent: 2892263 (1959-06-01), Hornbostel
patent: 3286360 (1966-11-01), Walker
patent: 4016032 (1977-04-01), Kankaanpaa
patent: 4086131 (1978-04-01), Rempel
patent: 4452669 (1984-06-01), Koski

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