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Monofilament yarn for a paper machine clothing fabric

Inactive Publication Date: 2014-09-18
VOITH PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a paper machine clothing (PMC) fabric with monofilaments made of a thermoplastic resin called polyamide 6 / 6T copolymer resin. This copolymer resin has a reduced water absorption compared to polyamide 6 alone, which improves its properties such as tenacity, loop strength, and knot strength. Additionally, the resin improves loop tenacity over polyamide 6 alone. This composition simplifies processing and does not require additional additives to effectively stand the test of time.

Problems solved by technology

This creates multiple friction points within the paper machine that wear down the PMC fabric and cause an increase in power consumption.
However, a common problem associated with each of these polyamides is that they absorb a considerable amount of water in the papermaking process due to the hydrogen bonding capacity of the amide linkages present in the polymer structure.
This results in a decrease in advantageous monofilament properties and dimensional changes to the fabric, which can lead to marking of the fibrous material web being produced thereon.
However, these approaches may result in adverse effects on the yarn tensile properties.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Monofilament yarn for a paper machine clothing fabric
  • Monofilament yarn for a paper machine clothing fabric
  • Monofilament yarn for a paper machine clothing fabric

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[0023]Table 1 below shows a comparison of the tensile properties of monofilament yarns produced with standard polyamide resins and a monofilament yarn produced with the PA6 / 6T copolymer resin according to the present invention. ASTM D2256-97 method was used to carry out the tensile testing of the yarns. The water absorption of the yarns was measured according to ASTM D570. The yarns were submerged in distilled water at approximately 23° C. for 24 hours. The samples were then removed, pat dried using lint free cloth and weighed. Further, the abrasion resistance of the yarns was measured using the squirrel cage method, which consists of the use of a rotating drum of metal wires which are aligned perpendicular to the polymer strands. A pretension is used on each polymer strand prior to starting the drum. During the test, the strands are continually abraded by the rotation of the drum and the strand's abrasion resistance is quantified by the number of cycles it takes for the strand to f...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

A paper machine clothing (PMC) fabric includes a plurality of monofilament yarns, at least some of which have a composition which is a thermoplastic resin. The thermoplastic resin yarns have physical properties including a water absorption of less than approximately 6% and a loop tenacity of greater than approximately 8.0 grams / denier.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a paper machine clothing, and more particularly, to the composition of monofilaments used in the paper machine clothing.[0003]2. Description of the Related Art[0004]A paper machine clothing (PMC) fabric is typically carried by a number of rolls in a paper machine, and travels at a high speed. Vacuum boxes are used to pull moisture from the web through the PMC. This creates multiple friction points within the paper machine that wear down the PMC fabric and cause an increase in power consumption. The individual yarns making up a PMC fabric require several desirable physical properties, such as modulus of elasticity, relative elongation, abrasion resistance, fibrillation resistance, water absorbency, and a low coefficient of friction.[0005]PMC fabrics, particularly in the forming and press sections of a papermaking machine, come into contact with large volumes of water. In the forming secti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D21F1/00
CPCD21F1/0027D21F7/08Y10T428/298Y10T428/249921
Inventor GOOD, BRIANDHENDE, VIKRAMZHU, YIDAN
Owner VOITH PATENT GMBH
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