B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
26/198, 18/924
B29C 39/12 (2006.01) B29C 41/04 (2006.01) B29D 29/06 (2006.01) D21F 3/02 (2006.01)
Patent
CA 1315063
ABSTRACT OF THE DISCLOSURE The invention relates to a method of and an apparatus for the manufacture of dimensionally stable, liquid- impermeable, flexible press bands, particularly for wet presses of paper making machines. With known manufacturing methods for such press bands, the provision of a structured surface for liquid dis- charge on the outer surface of the press band, which faces the fibrous web or the felts, is achieved either by reversing the press band after removal from the casting mould so that the structured surface becomes the outer surface of the band while the smooth surface forms the inside thereof, or by grinding drainage ducts. into the outer surface of the press band. But especially in the case of small band diameters, reversing of such cast press bands causes serious problems and entails considerable expenditure, wherein the risk of damage to the band cannot be excluded and grinding of the drainage ducts is just as expensive. To simplify the manufacturing process and to eliminate reversing of the press band after removal thereof from the casting mould, the inner wall of the centrifugal tube is provided with cavities and/or depressions which upon casting of the free-flowing mixture are filled there- with to form raised surface portions on the outer surface of the finished press band, so that in a sub- sequent pressing operation liquid to be discharged may be drained between said raised portions, and the completely cast press band is ground to finished size on the inside thereof.
533970
Joos Heinz
Krenkel Bernhard
F. Oberdorfer Siebtechnik Gmbh
Perley-Robertson Hill & Mcdougall Llp
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