Stabilized fabric seam for flat-woven continuous fabric belts

Abstract

A continuous fabric belt with intersecting threads and a method to produce the belt, so that within fabric seam region at least two strip-shaped regions which extend over the entire width of fabric seam and contain meeting points are arranged between strip-shaped fabric regions in which there are crossovers between warp- or machine directional threads and weft or cross-machine directional threads. The crossovers are materially connected by transmission welding.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of PCT application No. PCT / EP2012 / 052892, entitled “STABILISED FABRIC SEAM FOR FLAT-WOVEN CONTINUOUS FABRIC BANDS”, filed Feb. 21, 2012, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The current invention relates to continuous fabric belts for use in machines for the production of paper and relates in particular to the formation of fabric seams to connect the ends of the fabric belts in order to produce continuous fabric belts.[0004]2. Description of the Related Art[0005]Papers of various types, cartons and cardboards are summarized under the generic term of paper. Production of paper generally begins with the formation of a fibrous web from a fiber stock suspension in the forming section of a paper machine. The suspension and the fibrous web created therefrom through dewatering is supported on a continuous belt which—redirected through rollers—revolves wit...

AI Technical Summary

Benefits of technology

The present invention relates to a method for joining yarns in a fabric seam using near infrared light absorbing materials. The method allows for the distribution of the joining points to at least two fabric regions, which results in a more flexible finish of the fabric seam region. The use of welding light absorbing yarns is limited to the fabric seam region or a slightly extended welding region, which offers greater flexibility. The introduction of a material that absorbs light from the near infrared range into the yarn-contact region of crossovers of the warp- or machine directional threads with weft- or cross-machine directional threads is also possible. The arrangement of the meeting points in some embodiments provides increased tear resistance of the fabric seam.

Problems solved by technology

This causes open areas in the fabric seam which reduce its tear strength and can lead to uneven drying and marking of the fibrous web.

However, the strength of the seam increases only sub-proportionally with the seam length, so that the improvement of strength on long fabric seams is not within an economic ratio to the production costs.

This overlapping of the warp- or machine directional thread ends however leads to a local reduction of the hollow spaces between the yarns with the result of a local impairment of the water and air permeability of the fabric and thereby to a different dewatering and drying characteristic compared to the full weave.

Transmission laser welding of yarn crossovers in the fabric seam region of a continuous flat fabric belt conducted in this manner results however in greater stiffness of the fabric seam, compared to that in a full weave.

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