Dryer group with controlled heating and cooling of a paper web i

Details Dryer group with controlled heating and cooling of a paper web i Dryer group with controlled heating and cooling of a paper web i

1997-06-05

1998-12-22

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34119, D21F 500

Patent

active

058507019

ABSTRACT:
A dryer group for drying a paper web moving in a running direction through a paper-making machine includes and upper tier and a lower tier. The upper tier and lower tier each include a plurality of rotatable cylinders for carrying the paper web. Each of the cylinders has an inner chamber. The plurality of cylinders for the upper tier and the lower tier each include at least two drying cylinders and at least one cooling cylinder. The at least one cooling cylinder is disposed downstream from the at least two drying cylinders, relative to the running direction of the paper web. The upper tier and lower tier also each include a plurality of carrier rolls, with each carrier roll being disposed adjacent to a pair of corresponding cylinders. An upper felt and lower felt are alternately carried by each of the cylinders and each of the carrier rolls of the upper and lower tiers, respectively. A steam generating device is fluidly connected with the inner chamber of each drying cylinder of the upper and lower tiers, and a cooling fluid generating device is fluidly connected with the inner chamber of each cooling cylinder of the upper and lower tiers.

REFERENCES:
patent: 4622758 (1986-11-01), Lehtinen et al.
patent: 4625430 (1986-12-01), Aula et al.
patent: 5033207 (1991-07-01), Sturn et al.

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