Double layered paper making forming fabric with a coarse structu

Details Double layered paper making forming fabric with a coarse structu Double layered paper making forming fabric with a coarse structu

1988-10-28

1991-12-24

Hastings, Karen M.

Textiles: weaving

Fabrics

Drier felts

162348, 162DIG1, D21F 110, D03D 1300

Patent

active

050743392

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a double layered paper making forming fabric with a coarse structured running side and a fine structured paper side.
Since long time the paper makers request that in the manufacturing of paper making forming fabrics the paper side, i.e. the paper making surface of the paper making forming fabric, should be provided with an as small meshed structure as possible to obtain an optimal fiber depository at a high as possible retention and a complete absence of marking, while the running side of the paper making forming fabric should be provided with coarse meshes to achieve a good dewatering of the pulp, whereby furthermore the susceptibility to pollution should be reduced and the cleaning possibilities should be improved. Additionally the running side should be sufficiently wear resistant by respective built-in-materials, so that at least the life time usual nowadays for double layered forming fabrics is achieved.
For the attainment of the above quality features of double layered paper making forming fabrics considerable progresses have been made in the last years, but no fabrics could have been manufactured which are adequate in their entirety to the modern, quick and efficient but also more sensitive printing processes to that extent that they can deliver papers of highest quality. Even the so-called composite forming fabrics, comprising two complete fabrics connected to one another could not completely fulfill as yet the requirements of the requested paper qualities.
In this context attention is drawn for instance to U.S. Pat. No. 4,112,982 disclosing two-layered forming fabrics which are characterized by transverse or cross floatings on the paper side and a coarse structure of the running side by means of relatively thick cross threads of a relative low number. The practice has shown in this connection that only cross threads of a similar thickness can be interwoven with the fine longitudinal threads of the known double layered fabric on the running side thereof and that by increasing the diameter of the cross threads the weft runner quality is lost more and more. That means, the distance between the wear plane provided by the cross thread floatings and the plane of the longitudinal thread knuckles is getting less and less. That is the reason why the longitudinal threads are exposed too early to the wearing so that a quick loss of the stability in the longitudinal direction will occur leading finally to a tearing in transverse direction of the fabric and a reduced running time.


SUMMARY OF THE INVENTION

Accordingly, it is the object of the invention to provide a double layered paper making forming fabric of the above-mentioned type having improved sheet support surface smoothness and long service life.
It is another object of the present invention to provide such a papermaker's fabric with fine meshes on the paper side and coarse meshes on the running side and having moreover excellent wear resistance so that over the full service life papers of highest quality can be produced which are highly suited for the modern and sensitive printing processes.
These objects are solved by a double layered paper making forming fabric with a coarse structured running side and a fine structured paper side, comprising a longitudinal thread set and at least two cross thread sets which are interwoven in a weave pattern of at least six shafts, so that a cross thread set forms on the running side a wearing plane and the remaining cross threads or thread sets are arranged on the paper side, and threads of the cross thread sets on the running side may differ from each other with respect to the diameter and/or material of the threads, and the cross threads on the paper side may differ in the length of their floatings, wherein at least some of the cross threads on the running side form multiple threads, each of them consisting of at least two closely adjacent threads which are interlaced by different longitudinal threads. Thus, the basic idea of the invention is to interweave

REFERENCES:
patent: 3851681 (1974-12-01), Egan
patent: 4231401 (1980-11-01), Matuska
patent: 4394414 (1990-06-01), Borel
patent: 4564052 (1986-01-01), Borel
patent: 4592396 (1986-06-01), Borel et al.
patent: 4636426 (1987-01-01), Fleischer
patent: 4789009 (1988-12-01), Troughton

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