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US 6,179,013 B2Granted
Low caliper multi-layer forming fabrics with machine side cross machine direction yarns having a flattened cross section
AssigneeWeavexx Corporation
InventorThomas G. Gulya
Life of this patent
Estimating the term…
Abstract
Multi-layer papermaker's fabrics are provided which include flattened bottom fabric cross machine direction yarns that advantageously reduce the void volume and water carry of the fabric. These flattened yarns may be of oval, rectangular or other shape. These fabrics preferably include a relatively large number of cross machine direction yarns on the papermaking surface and/or a papermaking surface having single float machine direction knuckles, so as to provide a high level of fiber support and good papermaking qualities. The fabrics also preferably include good drainage paths between the flattened bottom cross machine direction yarns.
Claims24
A triple layer papermaker's forming, fabric comprising:
- a set of top machine direction yarns, a set of top cross machine direction yarns and a set of auxiliary top cross machine direction yarns that are interwoven to form a top fabric layer having a papermaking surface;
- a set of bottom machine direction yarns and a set of bottom cross machine direction yarns which are interwoven to form a bottom fabric layer having a machine side surface;
- wherein said top cross machine direction yarns and said bottom cross machine direction yarns are substantially stacked;
- wherein each yarn in said set of bottom cross machine directions yarns is a flattened cross machine direction yarn;
- and
- wherein said set of auxiliary top cross machine direction yarns comprises a set of stitching cross machine direction yarns which bind said top and bottom fabric layers together.
3 more elements
A double layer papermaker's forming fabric comprising:
- a set of machine direction yarns, a set of top cross machine direction yarns, a set of auxiliary top cross machine direction yarns and a set of bottom cross machine direction yarns which are interwoven to form a top fabric layer having a papermaking surface and a bottom fabric layer having a machine side surface;
- wherein each yarn in said set of bottom cross machine directions yarns is a flattened cross machine direction yarn;
- wherein the yarns in the set of machine direction yarns interlace with the bottom fabric layer by passing under one bottom cross machine direction yarn, over the next adjacent bottom cross machine direction yarn, and under the next adjacent bottom cross machine direction yarn;
- and
- wherein at least one of said auxiliary top cross machine direction yarns is positioned between each adjacent pair of yarns in said set of top cross machine direction yarns.
2 more elements
An auto-joinable multi-layer papermaker's forming fabric comprising:
- at least one set of machine direction yarns, a set of top cross machine direction yarns and a set of bottom cross machine direction yarns interwoven to form a multi-layer forming fabric having a top fabric layer and a bottom fabric layer;
- wherein at least selected yarns of said set of bottom cross machine direction yarns are flattened cross machine direction yarns,
- wherein the ratio between the number of yarns in the set of top cross machine direction yarns and the set of bottom cross machine direction yarns is approximately one-to-one;
- and
- wherein said fabric has a top layer cross machine direction yarn count of at least 80 picks per inch.
2 more elements
A method of making paper, said method comprising the steps of:
- (a) providing a multi-layer papermaker's forming fabric comprising:
- at least one set of machine direction yarns, a set of top cross machine direction yarns, a set of auxiliary top cross machine direction yarns and a set of bottom cross machine direction yarns which are interwoven to form a top fabric layer having a papermaking surface and a bottom fabric layer having a machine side surface;
- wherein each yarn in said set of bottom cross machine directions yarns is a flattened cross machine direction yarn having an aspect ratio of less than 2.5. and
- wherein said set of auxiliary top cross machine direction yarns comprises a set of stitching cross machine direction yarns which bind said top and bottom fabric layers together;
- (b) applying paper stock to said papermaker's fabric;
- and
- (c) removing moisture from said paper stock.
4 more elements
A triple layer papermaker's forming fabric comprising:
- a set of top machine direction yarns and a set of top cross machine direction yarns that are interwoven to form a top fabric layer having a papermaking surface;
- a set of bottom machine direction yarns and a set of bottom cross machine direction yarns having a flattened cross-section which are interwoven to form a bottom fabric layer having a machine side surface;
- and
- a set of stitching cross machine direction yarns which bind said top and bottom fabric layers together;
- wherein said set of stitching cross machine direction yarns comprises pairs of adjacent stitching yarns that are woven in said fabric such that when the first yarn of the pair is weaving in the top fabric layer the second yarn of the pair is passing downwardly from said top fabric layer to interweave with said bottom fabric layer.
2 more elements
Dependencies are inferred from the claim text.