Method for pocket ventilation and sheet support in a papermaking

Details Method for pocket ventilation and sheet support in a papermaking Method for pocket ventilation and sheet support in a papermaking

1998-09-18

2000-03-07

Gravini, Stephen

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

34458, 34457, F26B 300, D21F 500

Patent

active

06032385&

ABSTRACT:
A dryer section in a papermaking machine has two reversing rolls to form a pocket between each pair of dryers in a dryer tier. The first reversing roll is a vacuum roll and the second reversing roll is a grooved roll. A blow box is disposed between the two rolls, the blow box provides suction for the grooved roll and provides vacuum which restrains a web on the dryer fabric as it travels between the first and the second rolls. The blow box also provides a supply of make-up air which extends in a cross machine direction along the pocket formed by the two reversing rolls. The blow box also supports a pivoting foil which is positioned against the dryer fabric as it moves from a first dryer, towards the first reversing roll. The foil defines a region of low pressure which restrains the web as it travels between the first dryer and the first reversing roll.

REFERENCES:
patent: 4539762 (1985-09-01), Eskelinen et al.
patent: 4669198 (1987-06-01), Wedel
patent: 4953297 (1990-09-01), Eskelinen et al.
patent: 5068980 (1991-12-01), Mueller
patent: 5152078 (1992-10-01), Wedel
patent: 5230168 (1993-07-01), Heinzmann et al.
patent: 5495679 (1996-03-01), Deshpande et al.
patent: 5524360 (1996-06-01), Virta et al.
patent: 5737848 (1998-04-01), Chau-Huu et al.

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