Paper machine clothing with edge reinforcement

Abstract

The invention relates to a clothing for a web-processing machine, in particular a tissue machine, including a flat basic structure with an upper side and a lower side, and with a coating which is applied to the upper side and / or lower side and includes at least one polymer material. At least one polymer material is a polyurea, in particular an elastomer polyurea.

Description

[0001]This is a continuation of PCT application No. PCT / U.S.08 / 58135, entitled “PAPER MACHINE CLOTHING WITH EDGE REINFORCEMENT”, filed Mar. 25, 2008, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a clothing for a web-processing machine, in particular a paper machine, paperboard machine or tissue machine.[0004]2. Description of the Related Art[0005]To improve wear resistance and / or hydrolysis resistance, clothings for web-processing machines are often equipped in their edge region and / or seam region with a coating. These coatings frequently have the disadvantage of not adhering firmly enough to the threads of the, for example woven, structure of the clothing, and therefore, of flaking off the threads when exposed to the effects of tensile stress, abrasion forces, heat and moisture. In particular on dryer fabrics or through-air dryer (“TAD”) meshes, which are exposed to high temperature combined with...

AI Technical Summary

Benefits of technology

[0008]By providing a coating containing a polyurea, a coating with a much improved adherence to the basic structure of the clothing, a far higher resistance to abrasion and a far higher resistance to chemicals is provided. The penetration of moisture into the material of the basic structure is prevented by the coating, leading to a clear improvement in the hydrolysis resistance of the clothing that is provided with said coating.

[0032]In order to increase the abrasion resistance, coating can extend from the longitudinal edges over approximately ⅜ inch to 1 inch in the cross machine direction (“CMD direction”). In order to increase the hydrolysis stability the coating can extend from the longitudinal edges approximately 5 cm to 20 cm in CMD direction.

Problems solved by technology

These coatings frequently have the disadvantage of not adhering firmly enough to the threads of the, for example woven, structure of the clothing, and therefore, of flaking off the threads when exposed to the effects of tensile stress, abrasion forces, heat and moisture.

In particular on dryer fabrics or through-air dryer (“TAD”) meshes, which are exposed to high temperature combined with a high level of moisture, and for this reason, are often equipped with or made from PET threads, it is a problem that the coatings known from the prior art flake off the PET threads after a short time already.

These coatings frequently also improve the hydrolysis resistance of such meshes only to a limited extent or not at all.

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