Paper making and fiber liberation – Processes and products – Conditioning – preparing or repairing of apparatus
Patent
1997-04-17
1999-05-04
Silverman, Stanley S.
Paper making and fiber liberation
Processes and products
Conditioning, preparing or repairing of apparatus
162275, 162274, 162278, 134122R, 134 64R, 134 15, 68 44, 68204, D21B 102
Patent
active
059001178
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus and method for cleaning papermachine clothing and particularly, but not exclusively, to an apparatus and method for cleaning press felts.
2. Description of the Related Art
Generally speaking papermaking machines are made up of three sections, namely the forming, pressing and drying sections. In each section a fabric belt is used to transport a continuous paper sheet through the papermaking equipment as the paper is being manufactured. When in use, the fabric belts become contaminated with components from the pulp such as aluminium hydroxide, natural wood resin components, resin components, resin size, latex binders and inorganic coating pigments. The problem of belt contamination is increasing as the use of recycled paper in the pulp becomes more common. Debris on the belt may contaminate the paper product supported by the belt.
The traditional method of cleaning papermaking belts, such as press felts, is to direct jets of high pressure water onto the paper stock carrying surface of the felt from an apparatus which traverses the cross-machine direction of the belt. The water penetrates into the body of the felt and returns out through the paper side of the felt. As the water returns out through the felt surface, felt fibre ends are brought out from the felt. These shredded felt fibres contaminate the paper product supported by the belt.
SUMMARY OF THE INVENTION
The present invention has been made from a consideration of this problem.
According to a first aspect of the present invention there is provided a papermachine clothing cleaning apparatus comprising means for directing a fluid stream towards a first surface of the papermachine clothing and first and second bodies, said bodies respectively being located at opposite surfaces of the papermachine clothing, one of said bodies being movable relative to the other so as to form a press adjacent the area of papermachine clothing to be impacted by the fluid stream.
According to a second aspect of the present invention there is provided a method of cleaning papermachine clothing using apparatus comprising means for directing a fluid stream towards a first surface of the papermachine clothing and first and second bodies, said bodies respectively being located at opposite surfaces of the papermachine clothing, the method comprising the steps of moving one of said bodies relative to the other so as to form a press adjacent the area of papermachine clothing being impacted by the fluid stream.
The press force applied to the first surface of the papermachine clothing is large enough to balance the internal fluid pressure that is developed in the area of the papermachine clothing being cleaned.
The cleaning fluid is preferably water, optionally containing cleaning agents, such as detergents and anti-redeposition agents. The fluid stream is preferably injected into the papermachine clothing, such as a felt, under high pressure.
The first body preferably comprises a plate having a number of holes therethrough. The plate is pressed against the felt during the cleaning operation. The second body may, for example, be a plate, bar or roller.
The rate of fluid injection into the papermachine clothing can be regulated by regulating the water pressure and/or by selecting one press plate from a range of such plates having different numbers of holes. The conditioning effect of the felt cleaning apparatus may be influenced by selecting one press plate from a range of such plates having different patterns of holes and/or hole angles.
The pressure of the cleaning fluid intake will depend on the velocity, total volume saturation capability, water content and fibre orientation of the incoming belt, all of which will vary according to the type of papermachine clothing or papermachine press section used.
If the rate of fluid flow is increased to levels above the capacity of the papermachine clothing, an enforced lateral water flow in the felt can be achieved. The lateral flow can al
REFERENCES:
patent: 1501179 (1924-07-01), Peacock et al.
patent: 1550994 (1925-08-01), Vickery
patent: 2368662 (1945-02-01), Jordan
patent: 2544572 (1951-03-01), Vickery
patent: 3190793 (1965-06-01), Starke
patent: 4822454 (1989-04-01), Meirowitz et al.
patent: 4888096 (1989-12-01), Cowan et al.
patent: 4943451 (1990-07-01), Zimmer
Fortuna Jose S.
Scapa Group PLC
Silverman Stanley S.
LandOfFree
Apparatus and method for cleaning papermachine clothing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for cleaning papermachine clothing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for cleaning papermachine clothing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1867923