Papermaking dryer with multi-roll vacuum chamber

Details Papermaking dryer with multi-roll vacuum chamber Papermaking dryer with multi-roll vacuum chamber

1995-01-27

1996-03-05

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34114, F26B 1102

Patent

active

054956790

ABSTRACT:
The dryer of this invention employs a vacuum chamber interposed below and between first and second heated dryer rolls. The vacuum chamber has two sides and a top which overlies two grooved reversing rolls. The vacuum chamber controls all flow of air in the gap between and below the dryer rolls. The dryer-fabric-backed paper web passes from the first dryer roll around the reversing rolls and up to the second dryer roll. The dryer fabric seals the vacuum chamber, and air is drawn therefrom. The provision of the grooved rolls permits a greater wrap of the felt around the dryers and the application of vacuum to hold the web against the felt during movement of the web between the dryers and the grooved rolls and between the grooved rolls.

REFERENCES:
patent: 3956832 (1976-05-01), Justus
patent: 4807371 (1989-02-01), Wedel
patent: 4876803 (1989-10-01), Wedel
patent: 4882854 (1989-11-01), Wedel et al.
patent: 4967489 (1990-11-01), Autio
patent: 5046266 (1991-09-01), Autio

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