D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
92/15.3
D21F 5/02 (2006.01) D21F 3/10 (2006.01)
Patent
CA 1229756
METHOD OF AND APPARATUS FOR REMOVING LIQUID FROM WEBS OF POROUS MATERIAL STRONG CHIEU-HSIUNG CHUANG and HUGH ANSLEY THOMPSON ABSTRACT An apparatus for removing water or other liquids from webs of such porous materials as fibrous paper webs coursing through a papermaking machine without substantially compacting the webs. The web which may be coherent or perforate passes over a sector of a cylinder having preferential-capillary-size pores through its cylindrical-shape porous cover. Preferably, the porous cover comprises hydrophilic material which is substantially non-resilient and which renders the surfaces of the porous cover wettable by the liquid of interest. A portion of the interior of the cylinder may be subjected to a controlled level of vacuum to effect pneumatically augmented capillary flow of liquid from the web; and another portion of the cylinder may be subjected to pneumatic pressure for expelling the transferred liquid outwardly through a portion of the porous cover which is not in contact with the web. The method may comprise controlling the level of vacuum as a function of air flow to maximize liquid removal from a web while substantially obviating air flow through the capillary-size pores of the porous cover of the cylinder. Preferential-capillary-size pores are such that, relative to the pores of a wet porous web, normal capillary flow would preferentially occur from the pores of the web into the preferential-capillary-size pores of the porous cover when the web and porous cover are juxtaposed in surface-to-surface contact.
444388
Chuang Strong C.
Thompson Hugh A.
Gowling Lafleur Henderson Llp
The Procter & Gamble Company
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