Paper machine belt

a technology of paper machine and process belt, which is applied in the field of paper machine process belt, can solve the problems of paper sheet misalignment, paper sheet damage, and serious problems for papermakers

Inactive Publication Date: 2005-04-21
VOTH FABRICS PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] According to the present invention there is provided a paper machine belt having paper machine a layer for providing strength in the cross-machine direction (hereinafter “the cd supporting layer”) and two or more additional layers, wherein at least two of the a...

Problems solved by technology

When the web breaks the paper machine must be shut down and consequently this constitutes a serious problem to the papermaker.
In severe cases this can lead to the belt folding over which would, at the very least, mark the roller and cause misalignment and damage to t...

Method used

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Examples

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Embodiment Construction

[0046] Referring to FIG. 1, a transfer and smoothing belt 17 for use in the press section of a paper machine includes an endless loop having five layers 11-15.

[0047] The supporting layer 11, includes spirally wound machine direction yarns 16 into which batt has been needled to hold the yarns 16 in position. In this embodiment the machine direction yarns include three pairs of yarns twisted together.

[0048] The second layer 12, located on layer 11, itself includes two individual layers of thermoplastic polyurethane each having a weight of 400 g / m2 and being 0.4 mm thick. On heating these two polyurethane layers, a single homogeneous layer is formed which bonds and partially impregnates the md supporting fabric 11 and the adjacent upper cd supporting layer 13.

[0049] Layer 13 includes a quasi non-woven structure made up of multifilament, cross-machine direction yarns and extremely fine machine direction yarns, for loosely holding the cross-machine direction yarns in position. This la...

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Abstract

A paper machine belt that includes a cross-machine direction supporting layer providing strength in the cross-machine direction and at least two additional layers. The two additional layers include polymeric material and at least one of the additional layers that includes the polymeric material is positioned on one side of the cross-machine direction supporting layer and at least another of the additional layers that includes the polymeric material is positioned on an opposite side of the cross-machine direction supporting layer. The cross-machine direction supporting layer substantially includes cross-machine direction yarns loosely bound together with very fine machine-direction yarns. A ratio of mass of the cross-machine direction yarns to the machine direction yarns being at least 160:1, and mass of the polymeric material of the additional layer on the one side of the cross-machine direction supporting layer is substantially the same as a mass of the polymeric material of the additional layer that is provided on the opposite side of the cross-machine direction supporting layer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a Continuation in Part of International Application No. PCT / GB03 / 00830, filed Feb. 24, 2003, and claims priority of Great Britain Patent Application No. 0204310.7, filed on Feb. 23, 2002. Moreover, the disclosure of International Patent Application No. PCT / GB03 / 00830, filed Feb. 24, 2003, and International Patent Application No. PCT / GB03 / 00824 filed Feb. 24, 2003 are expressly incorporated by reference herein in their entireties. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to paper machine process belts and particularly, but not exclusively, to belts for transferring and / or smoothing the paper web within, to and / or from a press section of a paper machine. [0004] 2. Discussion of Background Information [0005] Transfer belts are used for carrying a paper web through a portion of a paper machine so as to eliminate open draws in which the paper web is unsupport...

Claims

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Application Information

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IPC IPC(8): D04B9/12D21F1/00D21F7/08
CPCD21F1/0036D21F7/086D21F7/083
Inventor KARLSSON, KJELL ANDERSLIDAR, VAINO PER-OLA
Owner VOTH FABRICS PATENT GMBH
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