Multi-cylinder dryer for a paper machine with supported draw of

Details Multi-cylinder dryer for a paper machine with supported draw of Multi-cylinder dryer for a paper machine with supported draw of

1989-10-25

1990-11-27

Yuen, Henry C.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34116, 34117, F26B 1102

Patent

active

049726080

ABSTRACT:
A multi-cylinder dryer for a paper machine having several drying groups situated one after the other, in which drying cylinders are situated one above the other in stacks, preferably in vertical stacks. In subsequent groups, a web is passed from one drying cylinder onto a next drying cylinder by way of a single-wire draw, so that the drying cylinders in the single-wire draw groups are situated outside the loops of their respective drying a wires. The web is passed as a supported draw from one single-wire group to a subsequent single-wire group by using at least two transfer-suction rolls. A first one of the transfer-suction rolls is situated inside a loop of a drying wire of the preceding single-wire draw group. The second or final transfer-suction roll is situated proximate to the first suction roll and inside a loop of a drying wire of the latter or subsequent single-wire draw group, proximate to a first drying cylinder in this subsequent group. Transfer of the web from one wire group to the next wire group takes place with support by a drying wire substantially all the time. At that location, the web is subjected to a difference in pressure that maintains the web in contact with a drying wire, generally a negative pressure being effective from the drying-wire side.

REFERENCES:
patent: 3355816 (1967-12-01), McKie et al.
patent: 3753298 (1973-08-01), Ely
patent: 4510698 (1985-04-01), Ely
patent: 4669198 (1987-06-01), Wedel
patent: 4875976 (1989-10-01), Wedel

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