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Fixation device
| Details |
Inventors: Gunderson, Harald;
Assignee: Alfsen & Gunderson A/S (Oslo, NO)
Primary Examiner: Chin; Peter
Assistant Examiner: Dang; Thi
Attorney, Agent or Firm: Dressler, Goldsmith, Shore, Sutker & Milnamow
Fixation device for permeable web materials, such as felts and wires for paper machines, where air at controlled temperature and pressure is pressed through the web from jets in at least one pressure chamber (12) on one side of the web, to at least one corresponding suction chamber (15) on the other side of the web, the device thereby comprising an upper structure (9) and a lower structure (10) between which the web is running during operation where a pressure chamber (16) with a corresponding suction chamber (13) being arranged in front of, and a pressure chamber (14) with a corresponding suction chamber (11) being arranged behind, at least one middle pressure chamber (12) with a corresponding suction chamber (15), each pressure chamber (12, 14, 16) being provided with two jets arranged in an acute angle to the web and towards each other, with one front jet (17, 19, 21) and one rear jet (18, 20, 22), thereby establishing and maintaining an overpressure between the jets and the web, jets arranged in opposed pressure chambers and adjacent each other thereby directing air passed each other in such a way that air from one pressure chamber substantially is prevented in penetrating into the adjacent suction chamber, and the upper and lower structures (9, 10) being provided with ducts (30, 31) for an air flow having a controlled temperature, thereby avoiding deformations of the upper structure (9) due to temperature influences from the heated air in the fixation process. |
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DETAILED DESCRIPTION OF THE DRAWINGS FIG.
1 discloses the principal structure of a fixation device according to the invention, comprising an upper structure 9 and a lower structure 10 extending across the total width of the felt or the wire 27, perpendicularly to direction of movement of the felt.
The felt as such creates an endless band, whereas only a short segment is disclosed in the Figure.
The upper structure 9 comprises a middle pressure chamber 12 supplied with pressurized air through a slit 28 in a duct 29, arranged in such a way that the air conditions as to temperature and pressure in the lower end of the pressure chamber 12 and especially across the full length of jets 5 and 17 arranged in the chamber, are substantially uniform.
The upper structure 9 is arranged in a distance from the lower structure 10, whereby the felt or the wire 27 is transfered between the structures.
A middle suction chamber being arranged in the lower structure 10 is adapted to receive the pressurized air from the middle pressure chamber 12 in the upper structure after the air having passed through the felt 27.
From the suction chamber 15 the air is brought to the devices adapted for conditioning of the air before reentrance into the pressure chamber 12, when using a closed circuit system.
In the lower structure 10, one pressure chamber is arranged on each side of the middle suction chamber 15, a front pressure chambers 16 and a rear pressure chamber 14.
The pressure chambers 14 and 16 are supplied with pressurized air principally in the same manner as the pressure chamber 12, in such a way that the pressure conditions in the upper parts of the pressure chambers 14 and 16 being substantially uniform when entering first and second jets 19 and 22 in the pressure chamber 14 and first and second jets 21 and 20 in the pressure chamber 16.
Front and rear suction chambers 13 and 11 are arranged in the upper structure 9 opposed to the lower pressure chambers on each side of the middle pressure chamber 12.
From the suction chambers 11 and 13 the air is guided to devices for reintroduction into the pressure chambers 14 and 16, separately or independently when using a closed circuit system
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Manufacturing Materials 
