Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1997-10-14
2000-10-24
Chin, Peter
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162274, 162275, D21F 132
Patent
active
061361488
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention is directed to a method of cleaning fabrics, particularly paper machine fabrics.
The present invention is also directed to an apparatus for cleaning fabrics, particularly paper machine fabrics.
Fouling of fabrics has been experienced to be a problem in present fast running paper machines and particularly in such machines which use fillers and/or recycled fibres. In addition, or alternatively to that, particularly the fast decreasing of permeability of the first drying fabrics or wires after the machine has been started is becoming more and more common, particularly in machines where so called suction rolls and web stabilizers are used for supporting the web in contact with the drying fabric. In such a case also dust and/or other particles in surrounding air and/or in the web is sucked through the fabric. Dust or other particles decrease rapidly the permeability of the fabric and thus, e.g. reduce the effect of the web stabilizing equipment, which may result in a need of decreasing the speed of the machine.
In presently used cleaning methods the cleaning of fabrics is typically accomplished by blowing pressurized air or cleaning liquid through the fabric with special nozzles, which are moved across the running direction of the fabric. In such a case, even if there are several nozzles adjacent to each other, a considerably long period of time is required for good cleaning results in order to have the whole fabric treated.
It is an intention of the present invention to provide a totally new method of cleaning of fabric, with which method shortcomings of the prior art are minimized.
It is also an intention of the present invention to provide a totally new apparatus for cleaning of fabric, with which method shortcomings of the prior art are avoided.
SUMMARY OF THE INVENTION
The solution according to the present invention has several considerable advantages compared to prior art systems. The method according to the present invention is very quick. The whole fabric may be cleaned over its whole area even during a short break. For example, when a machine speed is 1300 m/min and the fabric has a length of 45 m, the cleaning of the fabric takes place about 29 times during a one minute cleaning period. Thus the method of the present invention does not require long shut-down periods of the paper machine. Also, the cleaning is accomplished during normal running conditions, that is, normal operation speed.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in the following by means of preferred examples referring to the following figures, in which;
FIG. 1 depicts an exemplary embodiment according to the present invention,
FIG. 2 depicts another exemplary embodiment according to the present invention,
FIG. 3 depicts still another exemplary embodiment according to the present invention,
FIG. 4 depicts still another embodiment according to the present invention, and
FIG. 5 depicts still another embodiment according to the present invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
In the case of FIG. 1 the fabric (1), such as a wire or felt of a paper machine has been arranged to run along the roll or cylinder (2). The gap (3) defined by the fabric (1) and the cylindric surface (of a cylinder of a roll) is referred to a nip. The nip is called as a closing nip, if the fabric (1) is coming into the gap, and respectively as an opening nip if the fabric (1) in leaving the gap. According to the invention liquid for cleaning the fabric is introduced into the closing nip (3), between the fabric (1) and roll (2). Thus the liquid is pressed between the roll (2) and the fabric (1) and further into the fabric (1) disengaging therefrom by an effect of, e.g., centrifugal force caused by the rotation of the roll (2). The liquid is thus carried along through the fabric. The fabric is cleaned of its whole width several times even during a period of one minute. In case the paper machine speed is 1300 m/min and the fabric has a length of 45 m, the cleaning of the fabric
REFERENCES:
patent: 3347740 (1967-10-01), Goumeniouk
patent: 5863386 (1999-01-01), Vuorinen et al.
1993 Practical Aspects of Pressing and Drying Seminar, Course Notes pp. 1-16, M.M. Cutts: "Press and Dryer Fabric Cleaning and Moisture Profile Management".
Haverinen Timo
Koskinen Pekka
Chin Peter
EV Group Oy
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