B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
92/60
B01D 33/04 (2006.01) D06B 5/08 (2006.01)
Patent
CA 1285164
ABSTRACT OF THE DISCLOSURE The invention is a method and apparatus for treating a perme- able web with a fluid. The fluid may be used for displacement washing of the web, it may be a reactive material, or it may be some other type of treatment. The apparatus has a rotatable drum with a fluid permeable endless belt reeved about at least a portion of the drum circumference, Two or more spaced-apart press rolls bear against the outer surface of the belt, pressing it against the drum with sufficient force to form nip zones. A belt position control mechanism gives the belt limited freedom of radial movement away from the drum in the area between the nip zones. This permits a gap of controllable dimension to form between the drum and the belt. The gapped region defines a volume which creates a perme- able web treating zone. The drum surface has at least one row of spaced apertures located entirely around its circumference. These apertures communicate with a fluid supply system which can supply treating fluid under pressure outwardly through the surface apertures into the treating zones between the press rolls. Seals between the edges of the belt and the drum prevent fluid leakage along the belt margins. A conventional driving apparatus completes the apparatus. In use, the web of material being treated is passed between the moving belt and rotating drum. Treating fluid under pressure is directed outwardly through the drum apertures against the drum facing surface of the web as it passes through the treating zone. The treating zone becomes pressurized and the web being treated is forced against the belt and away from the drum surface, The gap between the drum and belt is made sufficiently large to permit a pool of fluid to form between the web and drum. In one version of the invention, the drum is free floating and supported only by the belt and press rolls.
548122
Miller Ray R.
Osler Hoskin & Harcourt Llp
LandOfFree
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