Combination comprising the press section and the initial...

Details Combination comprising the press section and the initial... Combination comprising the press section and the initial...

D - Textiles, Paper

21

F

92/21

D21F 3/00 (2006.01) D21F 3/04 (2006.01) D21F 5/04 (2006.01)

Patent

CA 2015815

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 (N1, N2, N3) with one another. The press section further comprises a separate press, whose press rolls (30, 31) for a press nip (N4). 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 centre 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.

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