Presses – Methods – With separation from material of liquid expressed
Patent
1988-10-28
1990-01-02
Coe, Philip R.
Presses
Methods
With separation from material of liquid expressed
8156, 68 45, 68158, 68181R, 100118, 100154, 162 60, 210400, D21C 102
Patent
active
048905500
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for treating fibre material containing liquid, said apparatus comprising, at least two drums rotatably journalled on horizontal shafts in a stand, an endless driven belt pervious to liquid and gas and extending between and passing around the cylindrical surfaces of the drums, a feeding means for the supply and a discharging means for the removal of the fibre material, at least one collecting container for collecting liquid and if applicable gas, the liquid and gas being displaced from the fibre material through the endless, driven belt, a continuous wall means impervious to liquid and gas and extending along a main part of and at a distance from the endless, moving belt from the feeding means to the discharging means in such a manner that a continuous space is defined for the liquid containing fibre material between said wall means and the endless, moving belt, and at least a part of the space, seen in the direction of movement of the belt, forms one or more treating zones where liquid and gas if any are displaced from the fibre web through the movable belt to one or more collecting containers.
Various types of apparatus for treating fibre material containing liquid in the form of fibre suspensions are known. They are of a more or less practical nature, and the following references are mentioned as being representative.
FI No. 67892 describes a special fourdrinier wire washing apparatus for washing cellulose pulp in two or more steps, the wire and the fibre web produced thereon being moved through the washing liquid. The washing liquid flows through the fibre web and the wire, the liquid in the fibre web being displaced.
SE No. 157267 describes a means for filtering suspensions such as waste water from the paper industry and comprises an endless screening belt introduced from above into a container filled with the suspension and passing several suction boxes and a rotating screening drum. Before the screening belt is lowered into the suspension a preliminary filter layer is formed thereon.
U.S. Pat. No. 4,014,736 describes a fourdrinier wire washing apparatus having a plurality of suction boxes arranged on the lower side of the upper, horizontal part of a wire running around two rollers spaced apart. In such a washing apparatus of the fourdrinier wire type, only the upper horizontal part of the wire can be utilized for washing a fibre web formed thereon. Considerable force is required to drive the wire and overcome the friction between wire and suction-box lid. The considerable tensile stresses thus occurring in the wire, limit its length since the tensile stress increases with the length of the contact area between wire and suction-box lid.
SE No. 8306658-9 proposes a solution to this problem of tensile strength by replacing the wire by a perforated steel strip. However, the washing result is still limited since the suction effect cannot be increased in view of the resultant increased friction between steel strip and suction-box lid. This reference therefore proposes arranging a special belt pervious to liquid arranged in conjunction with one of the rollers around which the steel strip passes, this special belt running around rollers and cooperating with the steel strip to press liquid out of the fibre web passing therebetween, thus achieving a higher dry solids content in the fibre web produced.
U.S. Pat. No. 3,878,698 (corresponding to SE No. 349340)describes a washing press for washing a fibre web formed on a rotating perforated drum and washed in a washing zone. A liquid chamber being under pressure is arranged on the outside of a cover inside which the fibre web travels. Within the region of the liquid chamber, the cover is provided with a plurality of cylindrical liquid flow channels emerging on the inside of the cover and being in direct contact with the fibre web.
SE No. 378433 describes an apparatus for continuously separating a suspension liquid from a fibre suspension which is conducted through a fibre separating space defined by the casing of a rot
REFERENCES:
patent: 3469704 (1969-09-01), Sepall
patent: 3938206 (1976-02-01), Stranger-Johannessen
patent: 4265171 (1981-05-01), Busse et al.
patent: 4292123 (1981-09-01), Lintunen et al.
patent: 4769986 (1988-09-01), Kokkonen et al.
Eriksson Sture
Jonsson Ann-Sofi
Jonsson Bengt
Coe Philip R.
Kamyr Aktiebolag
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