Methods and apparatus for dewatering leather
OwnerJiri Dokoupilinventor
Life of this patent
Estimating the term…
Abstract
A method of, and apparatus for, dewatering leather wherein there is provided at least a first dewatering-pressure zone and to both sides and neighboring such first dewatering-pressure zone two further dewatering-pressure zones producing a lower pressure than the first dewatering-pressure zone. The two further dewatering-pressure zones together with the first dewatering-pressure zone move over the surface of the leather, and the leather, at the region of the pressure zones, is brought into pressure contact, at least at one face or side thereof, with an absorbent element.
Claims10
A method of dewatering leather comprising the steps of:
- 1. feeding the leather containing water along a predetermined path of travel;
- 2. providing at least a first dewatering-pressure zone along the path of travel for the leather;
- 3. providing two further dewatering-pressure zones, one to each side and neighboring the first dewatering-pressure zone, said two further dewatering-pressure zones producing a pressure which is less than the pressure generated at the first dewatering-pressure zone;
- 4. said two further dewatering-pressure zones moving together with the first dewatering-pressure zone over the surface of the leather;
- and
- 5. bringing into pressure contact with the leather at least at one side thereof at the region of the pressure zones an absorbent element for removing the squeezed-out water.
An apparatus for dewatering leather, comprising at least one pair of dewatering-pressure rolls defining a dewatering zone, a pair of transport bands conveying the leather therebetween in a predetermined direction of travel and between the dewatering-pressure roll pair, at least one of the transport bands is structured for taking-up water, a hollow roll within which there is arranged at least one of the dewatering-pressure rolls, said hollow roll having a flexible shell, said hollow roll cooperating with the other of said dewatering-pressure rolls to define therebetween a roll nip through which passes the leather to be dewatered, the dewatering pressure being transmitted via the flexible shell of the hollow roll to the leather, said flexible shell of the hollow roll possessing a greater elasticity in radial direction in comparison to the elasticity in radial direction of said one dewatering-pressure roll arranged therein.
An apparatus for dewatering leather, comprising at least one pair of dewatering-pressure rolls defining a dewatering zone, transport means for conveying the leather between the dewatering-pressure roll pair and for absorbing water expressed from the leather, a hollow roll within which there is arranged at least one of the dewatering-pressure rolls, said hollow roll cooperating with the other of said dewatering-pressure rolls to form therebetween a roll nip through which passes the leather to be dewatered, said hollow roll having a flexible jacket, the dewatering pressure being transmitted via the flexible jacket of the hollow roll to the leather, said flexible jacket of the hollow roll possessing a greater elasticity in radial direction in comparison to the elasticity in radial direction of said one dewatering-pressure roll arranged therein, said flexible jacket cooperating with said pair of dewatering-pressure rolls to form at said dewatering zone an increased pressure zone at the region of said roll nip and to each side thereof a respective zone of reduced pressure relative to said increased pressure zone, one of said reduced pressure zones providing an infeed region for the leather, whereby there is provided relatively wrinkle free infeed of the leather from said infeed zone of reduced pressure to said roll nip and high squeezing-dewatering action at the increased pressure zone.
Dependencies are inferred from the claim text.