Papermakers superimposed felt with voids formed by removing yarns
AssigneeAscoe Felts, Inc.
InventorsIan K. Booth, Francis J. Cunnane, III
Life of this patent
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Abstract
A papermakers felt having improved void volume and a method for manufacturing of the felt are disclosed. The felt as woven comprises at least three plies with one ply being comprised of removable yarns. Through removal of the removable yarns, a series of voids are created in the final felt.
Claims22
A papermaker's felt comprising at least:
- a first yarn system of machine direction yarns defining a first plane;
- a second yarn system of cross machine direction yarns interwoven with said first yarn system in said first plane and extending freely beyond said first plane into a second plane adjacent to said first plane;
- a third yarn system of machine direction yarns defining a third plane adjacent to said second plane;
- a fourth yarn system of cross machine direction yarns interwoven with said third yarn system in said third plane and extending freely above said third plane and into said second plane and cooperating with said second yarn system to define a plurality of void in said felt;
- and
- a batt needled adjacent to said first plane and having portions thereof extending into said first, second and third planes and retaining said planes relative to each other.
An improved multi-ply fabric for use as a papermaker's fabric, said fabric being of the type having controlled void volume through out and comprising at least a first yarn system of machine direction yarns, an intermediate yarn system of machine direction yarns, a third yarn system of machine direction yarns, a fourth yarn system of cross machine direction yarns interwoven with said first and intermediate machine direction yarn system and a fifth yarn system of cross machine direction yarns interwoven with said intermediate and third machine direction yarns systems, the improvement characterized by:
- said intermediate yarn system being comprised of removable yarns.
A method for making a papermaker's wet felt structure having improved void volume said method comprising at least the steps of:
- providing a first system of machine direction yarns;
- providing a second system of machine direction yarns, said second system of machine direction yarns comprised of removable yarns;
- providing a third system of machine direction yarns;
- providing a fourth yarn system of cross machine direction yarns interwoven with said first and second yarn systems of machine direction yarns;
- providing a fifth yarn system of cross machine direction yarns interwoven with said second and third yarn systems of machine direction yarns;
- needling a batt adjacent to at least one of said machine direction yarn systems, said needled portion of said batt having at least a portion thereof which extends into said at least said second and third yarn systems and retains said yarn systems relative to each other;
- and
- removing said removable yarns of the second yarn system of machine direction yarns from said structure to define a plurality of void in said structure.
A method for making a papermaker's wet felt structure having improved void volume said method comprising at least the steps of:
- providing a top layer of machine direction yarns;
- providing an intermediate layer of machine direction yarns said intermediate layer comprised of removable yarns;
- providing a bottom layer of machine direction yarns;
- providing a system of cross-machine direction yarns interwoven with said top, middle and bottom machine direction layers, each said cross-machine direction yarns woven in repeat pattern having interlacings with machine direction yarns in at least two of said machine direction layers;
- providing selected yarns among said cross-machine direction yarns interwoven with said intermediate layer and with said top layer with floats which extend over at least three top layer yarns so that said selected cross-machine direction yarns predominate the surface which they define with said top layer;
- providing selected yarns among said cross-machine direction yarns interwoven with said intermediate layer and with said bottom layer with floats which extend under at least three machine direction yarns so that said selected cross-machine direction yarns predominate the surface which they define with said bottom layer;
- providing a needling batt adjacent to at least one of said machine direction yarn systems, said needled portion of said batt having at least a portion thereof which extends into said at least said second and third yarn systems and retains said yarn systems relative to each other;
- and
- removing said removable yarns of the second yarn system of machine direction yarns from said structure to define a plurality of void in said structure.
A method for making a papermaker's wet felt comprising at least the steps of:
- providing a first system of machine direction yarns;
- providing a second system of machine direction yarns, said second system of machine direction yarns comprised of soluble yarns;
- providing a third system of machine direction yarns;
- providing a fourth yarn system of cross machine direction yarns interwoven with said first and second yarn systems of machine direction yarns;
- providing a fifth yarn system of cross machine direction yarns interwoven with said second and third yarn systems of machine direction yarns;
- needling a batt adjacent to at least one of said machine direction yarn systems to retain at least said first and third systems relative to each other;
- and
- dissolving said soluble yarns of the second yarn system of machine direction yarns to define a plurality of voids.
Dependencies are inferred from the claim text.