US2009183795A1PendingUtilityA1

Multi-Layer Papermaker's Forming Fabric With Long Machine Side MD Floats

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Assignee: WARD KEVIN JOHNPriority: Jan 23, 2008Filed: Jan 23, 2008Published: Jul 23, 2009
Est. expiryJan 23, 2028(~1.5 yrs left)· nominal 20-yr term from priority
Inventors:Kevin WardJason Goins
D21F 1/0045
44
PatentIndex Score
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Claims

Abstract

A papermaker's fabric includes: a set of top MD yarns; a set of bottom MD yarns; a set of top CMD yarns interwoven with the top MD yarns to form a top fabric layer; a set of bottom CMD yarns interwoven with the bottom MD yarns to form a bottom fabric layer; and a set of stitching yarns that interweave with the top and bottom fabric layers. The top MD yarns and the top CMD yarns are interwoven in a series of repeat units and the bottom MD yarns and the bottom CMD yarns are interwoven in a series of corresponding repeat units. Each of the bottom MD yarns forms a bottom MD float by passing under three or more consecutive bottom CMD yarns.

Claims

exact text as granted — not AI-modified
1 . A papermaker's fabric, comprising:
 a set of top machine direction (MD) yarns;   a set of bottom MD yarns;   a set of top cross machine direction (CMD) yarns interwoven with the top MD yarns to form a top fabric layer;   a set of bottom CMD yarns interwoven with the bottom MD yarns to form a bottom fabric layer;   and a set of stitching yarns that interweave with the top and bottom fabric layers;   wherein the top MD yarns and the top CMD yarns are interwoven in a series of repeat units and the bottom MD yarns and the bottom CMD yarns are interwoven in a series of corresponding repeat units;   wherein each of the bottom MD yarns forms a bottom MD float by passing under three or more consecutive bottom CMD yarns.   
     
     
         2 . The papermaker's fabric defined in  claim 1 , wherein the bottom MD floats pass under between three and five consecutive bottom CMD yarns. 
     
     
         3 . The papermaker's fabric defined in  claim 1 , wherein the bottom MD yarns comprise monofilament yarns. 
     
     
         4 . The papermaker's fabric defined in  claim 1 , wherein the stitching yarns are arranged in pairs. 
     
     
         5 . The papermaker's fabric defined in  claim 4 , wherein the stitching yarn pairs comprise MD stitching yarns. 
     
     
         6 . The papermaker's fabric defined in  claim 4 , wherein the stitching yarn pairs comprise CMD stitching yarns. 
     
     
         7 . The papermaker's fabric defined in  claim 1 , wherein the top MD yarns, the top CMD yarns and the stitching yarns combine in the top fabric layer to form a plain weave top surface. 
     
     
         8 . The papermaker's fabric defined in  claim 1 , wherein each of the MD yarns of the top layer is also a stitching yarn. 
     
     
         9 . The papermaker's fabric defined in  claim 4 , wherein one of the stitching yarns of each pair is a phantom stitching yarn. 
     
     
         10 . The papermaker's fabric defined in  claim 5 , wherein each of the stitching yarns stitches below a bottom CMD yarn that is one of the consecutive yarns that each of the adjacent bottom MD yarn passes under in forming the bottom MD float. 
     
     
         11 . The papermaker's fabric defined in  claim 6 , wherein each of the stitching yarns stitches under a bottom MD yarn that an adjacent bottom CMD yarn also passes under. 
     
     
         12 . The papermaker's fabric defined in  claim 1 , wherein the top MD yarns have a first diameter, the bottom MD yarns have a second diameter, and the first diameter is smaller than the second diameter. 
     
     
         13 . The papermaker's fabric defined in  claim 8 , wherein the ratio of MD stitching yarn pairs to bottom MD yarns is 1:1. 
     
     
         14 . The papermaker's fabric defined in  claim 5 , wherein the ratio of top MD yarns and stitching yarn pairs to bottom MD yarns is 2:3. 
     
     
         15 . The papermaker's fabric defined in  claim 5 , wherein the ratio of top CMD yarns to bottom CMD yarns is 5:2. 
     
     
         16 . The papermaker's fabric defined in  claim 6 , wherein the ratio of top CMD yarns to bottom CMD yarns is 1:1. 
     
     
         17 . A papermaker's fabric, comprising:
 a set of top machine direction (MD) yarns;   a set of bottom MD yarns;   a set of cross machine direction (CMD) yarns interwoven with the top MD yarns to form a top fabric layer;   a set of CMD stitching yarn pairs that interweave with the top and bottom fabric layers;   wherein the top MD yarns and the top CMD yarns are interwoven in a series of repeat units and the bottom MD yarns and the bottom CMD yarns are interwoven in a series of corresponding repeat units;   wherein each of the bottom MD yarns forms a bottom MD float by passing under three or more consecutive CMD stitching yarn pairs.   
     
     
         18 . The papermaker's fabric defined in  claim 17 , wherein the bottom MD yarns comprise monofilament yarns. 
     
     
         19 . The papermaker's fabric defined in  claim 17 , wherein the top MD yarns, the top CMD yarns, and the stitching yarns combine in the top fabric layer to form a plain weave top surface. 
     
     
         20 . The papermaker's fabric defined in  claim 17 , wherein one of the CMD stitching yarns of each pair is a phantom stitching yarn. 
     
     
         21 . The papermaker's fabric defined in  claim 17 , wherein the ratio of top MD yarns to bottom MD yarns is 1:1. 
     
     
         22 . A papermaker's fabric, comprising:
 a set of machine direction (MD) stitching yarns, the stitching yarns being arranged in pairs;   a set of bottom MD yarns;   a set of top cross machine direction (CMD) yarns interwoven with the MD stitching yarns to form a top fabric layer; and   a set of bottom CMD yarns interwoven with the bottom MD yarns to form a bottom fabric layer;   wherein the MD stitching yarns and the top CMD yarns are interwoven in a series of repeat units and the bottom MD yarns, the MD stitching yarns and the bottom CMD yarns are interwoven in a series of corresponding repeat units; and   wherein the MD stitching yarns have a first diameter, the bottom MD yarns have a second diameter, and the first diameter is less than the second diameter.   
     
     
         23 . The papermaker's fabric defined in  claim 22 , wherein the ratio of the first diameter to the second diameter is between about 0.4 and 0.7.

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