Method and a device for drying or heat treatment of a...

Details Method and a device for drying or heat treatment of a... Method and a device for drying or heat treatment of a...

2008-07-22

2008-07-22

Lu, Jiping (Department: 3749)

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

C034S451000, C034S507000, C034S510000

Reexamination Certificate

active

10539398

ABSTRACT:
When drying a web-formed material, the web-formed material is passed, in contact with a gas-permeable dryer screen, through a drying plant. One or more fans blow hot process air against, and through, the web-formed material in order to dry it. A chamber, surrounding the fan or the fans, has a limiting surface that is essentially parallel to the surface of the web-formed material. This limiting surface has an opening that extends essentially across the whole width of the web-formed material. A distributing member, in the form of an arcuate perforated, sheet-formed element, placed outside the chamber, covers the opening completely. With the distributing member a first flow of process air is divided into a large number of jets, distributed over essentially the whole of the angular area that faces the web-formed material. Thereafter, the jets are allowed to mix with one another again to form a second flow of process air, which is passed through a flat perforated, sheet-formed element that is positioned close to and extends over essentially the whole of the web-formed material, and then against and through the web-formed material lying on the gas-permeable dryer screen.

REFERENCES:
patent: 3849904 (1974-11-01), Villalobos
patent: 4133636 (1979-01-01), Flynn
patent: 4253247 (1981-03-01), Bergstrom
patent: 4365423 (1982-12-01), Arter et al.
patent: 4977687 (1990-12-01), Boissevain
patent: 5337586 (1994-08-01), Ronchi
patent: 5967770 (1999-10-01), Heine et al.
patent: 6735882 (2004-05-01), Takahashi

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