Press section dewatering fabric
AssigneeJWI Ltd.
InventorGraham W. Jackson
Life of this patent
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Abstract
A dewatering fabric for the press section of a paper machine having improved dewatering capabilities. The fabric is constructed to provide long exposed floats of flattened monofilaments on the paper side of the fabric, at a high fill factor. The fabric may be used alone, with a paper side batt, or with a batt on each side.
Claims31
A woven dewatering fabric for the press section of a paper making machine having a paper side, a machine side, opposed side edges, the fabric having a cross-machine direction extending between the side edges and a machine direction extending perpendicularly to the cross-machine direction, and having a fabric weave pattern that provides long exposed floats on the paper side of the fabric of a monofilament warp yarn having a flattened cross-section with an aspect ratio of at least 1.5:1, having a fill factor for the flattened monofilament of at least 45%, and having a float ratio for the exposed floats of the flattened monofilaments expressed by the formula of a/b wherein:
- (i) "a" represents the number of paper side surface layer weft yarns in a single weave pattern repeat of a flattened monofilament warp which are underneath and in contact with that warp;
- (ii) "b" represents the total number of paper side surface layer weft yarns in the single weave pattern repeat;
- and further wherein for a majority of the long exposed floats:
- (iii) "a" is greater than 1;
- and
- (iv) "a" is greater than one half of "b".
Dependencies are inferred from the claim text.