Multi-cylinder dryer with twin-wire draw and web transfer betwee

Details Multi-cylinder dryer with twin-wire draw and web transfer betwee Multi-cylinder dryer with twin-wire draw and web transfer betwee

1989-12-01

1990-11-06

Yuen, Henry C.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34115, 34116, F26B 1102

Patent

active

049674897

ABSTRACT:
Multi-cylinder dryer, has upper cylinder (13,14,15,16) and lower cylinders (10,11,12) over which a paper web (W) to be dried is run in meandering fashion from one cylinder onto the next cylinder The paper web is in direct contact with each drying cylinder within a sector that is larger than 180.degree.. An upper wire (5) and a lower wire (6) are used to press the paper web against faces of the drying cylinders (10,11,12; 13,14,15,16). The wires (6,5) are guided by guide rolls, which are placed in such a way that the paper web (W) is continuously supported by a wire (5,6) as it runs from one cylinder onto the other. The guide roll arrangements consist of fragmentary rolls (21,51), which are supported on suction boxes (20) and/or on blow boxes (50) so that at least two fragmentary rolls (21,51) are supported on each suction box (20)/blow box (50). By means of the suction boxes (20)/blow boxes (50), blowings (S,P) are directed at the drying wire (5,6). The blowings improve a support contact between the paper web (W) and the wire (5,6) and/or pocket ventilation.

REFERENCES:
patent: 3874997 (1975-04-01), Kankaanpaa
patent: 3956832 (1976-05-01), Justus
patent: 4835881 (1989-06-01), Welsby
patent: 4881327 (1989-11-01), Hauser et al.
patent: 4905380 (1990-03-01), Eskelinen et al.

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