Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1989-03-09
1990-06-12
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34115, 34120, 162370, F26B 500
Patent
active
049321382
ABSTRACT:
Method and device in a drying group or groups provided with a single wire draw, in a multi-cylinder dryer of a paper machine for securing the threading of the web. The multi-cylinder dryer has drying cylinders heated by steam or equivalent, with the web to be dried being pressed by the drying wire into direct contact with cylinder faces of the drying cylinders. The multi-cylinder dryer also has leading cylinders or rolls on which the web remains outside the drying wire. In the area of single-wire draw, the leading cylinders or rolls are provided with a suction zone situated at a side of the service-side end of the rolls. The suction zone is provided by way of perforations passing through a mantle of the leading cylinders or rolls. The negative pressure present in an interior space in the leading cylinders is spread onto the outer faces thereof through the perforations and by way of grooves situated within the area of the suction zone and passing around the roll mantle. The sector of the leading cylinders or rolls that remains free from the drying wire and from the web, is closed over the suction zone by way of an outer closing arrangement.
REFERENCES:
patent: 2714342 (1955-08-01), Beachler
patent: 3091563 (1963-05-01), Meyer
patent: 4202113 (1980-05-01), Kankaanpaa
patent: 4483083 (1989-11-01), Chance
Karlsson Markku
Liedes Allan
Bennett Henry A.
Sollecito John
Valmet Paper Machinery Inc.
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