(19) |
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(11) |
EP 0 248 625 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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05.07.1989 Bulletin 1989/27 |
(43) |
Date of publication A2: |
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09.12.1987 Bulletin 1987/50 |
(22) |
Date of filing: 01.06.1987 |
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(51) |
International Patent Classification (IPC)4: B30B 9/24 |
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(84) |
Designated Contracting States: |
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AT DE SE |
(30) |
Priority: |
04.06.1986 FI 862390
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(71) |
Applicant: A. AHLSTROM CORPORATION |
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29600 Noormarkku (FI) |
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(72) |
Inventors: |
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- Heino, Jukka
SF-57600 Savonlinna (FI)
- Kohonen, Raimo
SF-57230 Savonlinna (FI)
- Pöyry, Pekka
SF-55100 Imatra (FI)
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(74) |
Representative: Gilmour, David Cedric Franklyn et al |
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POTTS, KERR & CO.
15 Hamilton Square Birkenhead
Merseyside L41 6BR Birkenhead
Merseyside L41 6BR (GB) |
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(57) A filter press for removing excess water from a cake of slurry (3) running between
two opposite, endless wires (1, 2), the filter press comprising a pre-pressing section
(4) and a post-pressing section (5) and a turning roll (6) disposed between said pressing
sections in the direction transverse to the wires and extending substantially over
the whole width of the wires, and at which roll the direction of the wires is changed.
One of the problems with known filter presses presently in use is that the velocity
of the presses can not be improved because of the sealing difficulties between the
wires. The filter press according to the present invention avoids this problem as
the ends (7) of the turning roll (6) are at least during operation of the press closer
to the wire (2), which is further away from the roll in the center portion (8) of
the turning roll.