Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1981-11-24
1984-11-13
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34116, 34117, 34123, F26B 1308
Patent
active
044817231
ABSTRACT:
A paper machine multiple cylinder dryer includes a plurality of drying cylinders, in conjunction with which a drying fabric supports the web as it moves from one cylinder to another in closed conduction. A supporting fabric supports the web on some of the cylinders. The runs of the web supported by the drying fabric, the free surfaces of the drying cylinders and the runs of the supporting fabric confine elongated pockets in conjunction with the cylinders. In order to prevent web breaks occurring in the drying section of the fast-running paper machine, since such breaks are among the most important factors limiting the increasing of paper machine speeds, the multiple cylinder dryer provides a pressure greater than the ambient atmosphere pressure in the pockets in the direction of travel of the web, at least in the initial part of the dryer. This results in the considerable stabilization of the running of the web. One manner of producing the over-pressure is to partially or totally close both ends of the pockets with particular closing plates.
REFERENCES:
patent: 1595478 (1926-08-01), Minton
patent: 2910784 (1959-11-01), Metcalfe
patent: 3049809 (1962-08-01), Sellers
patent: 3250019 (1966-05-01), Beachler
patent: 3283415 (1966-11-01), Schnyder
patent: 3355816 (1967-12-01), McKie et al.
patent: 3751822 (1973-08-01), Crist
patent: 4172007 (1979-10-01), Kankaanpaa 34117
Schwartz Larry I.
Valmet Oy
Westphal David W.
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