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Process for imparting permanence to a shaped non thermoplastic fibrous material

A fiber material, non-thermoplastic technology, applied in the field of permanently formed fiber materials, can solve impractical problems and achieve the effect of eliminating intermediate steps

Inactive Publication Date: 2008-10-15
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of non-thermoplastic fibers containing amino groups, for high tpm of eg 1670 dtex yarn above one hundred twists per meter, it is impractical to apply this process, both in terms of productivity and uniformity

Method used

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  • Process for imparting permanence to a shaped non thermoplastic fibrous material
  • Process for imparting permanence to a shaped non thermoplastic fibrous material
  • Process for imparting permanence to a shaped non thermoplastic fibrous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Will A plain bobbin of 29 para-aramid yarn was used as the starting material for all the examples described below. The yarn consisted of 1000 filaments of 1.5 d / f and had a total density corresponding to 1670 dtex. This material is hereafter referred to as K29. The moisture content of K29 was determined to be 5.9% by weight using ASTM D885-98.

[0097] Using SAURER Elastic twisting machine (elasto-twister) AZB 200 / 240 Set at 500 tpm, a sufficient amount of K29 yarn was twisted and wound directly onto a plastic cylindrical bobbin which was known to be water resistant and showed no appreciable swelling or shrinkage on exposure to water. The 500 tpm twisted K29 ​​yarn is referred to as M3D hereinafter. The actual tpm was confirmed to be 609 tpm using a twist counter Zeigle D311, which is a fairly common deviation from the 500 tpm set point due to the high twist obtained with the manually controlled twister.

[0098] A 50cm M3D sample was allowed to relax freely, al...

Embodiment 2

[0101] Using SAURER Elastic twisting machine (elasto-twister) AZB 200 / 240 Set at 500 tpm, a sufficient amount of K29 yarn was twisted and wound directly onto a plastic cylindrical bobbin which was known to be water resistant and showed no appreciable swelling or shrinkage on exposure to water. The 500 tpm twisted K29 ​​yarn is referred to as M3D hereinafter. The actual tpm was confirmed to be 617 tpm using a twist counter Zeigle D311, which is a fairly common deviation from the 500 tpm set point due to the high twist obtained with the manually controlled twister.

[0102] A sufficient number of M3D bobbins were soaked for 48 hrs in a vessel filled with deionized water, and the resulting fibers were hereinafter referred to as M1-500. The moisture content of M1-500 was determined to be 22.1% by weight using ASTM D885-98.

[0103] A 50cm M1-500 sample was allowed to relax freely to untwist to its natural equilibrium level. Use a twist counter to completely untwist the M1-50...

Embodiment 3

[0106] Using SAURER Elastic twisting machine (elasto-twister) AZB 200 / 240 Set at 500 tpm, a sufficient amount of K29 yarn was twisted and wound directly onto a plastic cylindrical bobbin which was known to be water resistant and showed no appreciable swelling or shrinkage on exposure to water. The 500 tpm twisted K29 ​​yarn is referred to as M3D hereinafter. The actual tpm was confirmed to be 611 tpm using a twist counter Zeigle D311, which is a fairly common deviation from the 500 tpm set point due to the high twist obtained with the manually controlled twister.

[0107] Immerse a sufficient number of M3D cartridges in a container of deionized water for 48hr. Take out the bobbin from the container and feed it into the off-line processing device in Fig. 1 at 6m / min. The corresponding residence time in the cylinder TM010 resonant cavity is 3 seconds. figure 2 The resonant cylindrical cavity is depicted and its dimensions are also provided. The temperature of the fiber en...

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Abstract

The invention relates to a process to impart permanence to a shaped non thermoplastic fibrous material comprising submitting, under low tension, the shaped non thermoplastic fibrous material to a constant and uniformly distributed electromagnetic field generated by a single mode Transverse Magnetic 010 mode cylindrical resonant cavity microwave reactor,- the uniformly distributed electromagnetic field being operated at frequencies of from 5 MHz to 500 GHz,- the shaped non thermoplastic fibrous material being processed through the uniformly distributed electromagnetic field at a rate of from 0.01 to 1200 m / min,- the rate of the increase in temperature of the shaped non thermoplastic fibrous material being less than 300 DEG C / s,- the shaped non thermoplastic fibrous material comprising at least one polymeric structure comprising amino groups and at least 0.05 weight % of an aqueous composition. The invention also relates to permanently shaped non thermoplastic fibrous material obtained by this process, in particular to permanently twisted fibers, and to a structure comprising this shaped non thermoplastic fibrous material.

Description

[0001] This application is a divisional application of an invention patent application, the filing date of the parent application is December 4, 2002, the application number is 02824435.4, and the invention title is "Method for Imparting Permanence to Shaped Non-thermoplastic Fiber Materials". technical field [0002] The present invention relates to a method of imparting permanence to shaped non-thermoplastic fibrous materials containing amino groups. It also relates to permanently shaped fiber materials obtained from this method. Background technique [0003] Much textile processing involves the twisting process of multifilament fibers, which are then fabricated into woven, knitted or braided structures. Twisting is the process of combining filaments into a yarn by arranging them in a helical pattern or by combining two or more parallel individual yarns into a plied thread or rope. Twist is generally expressed as: the number of turns per unit length of fiber around its lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M10/00D02J13/00D02G1/20H05B6/78H05B6/80
CPCH05B6/788D02J13/001D02G1/20D06M10/003D06M10/00
Inventor S·勒布瓦拉特N·庞特B·斯蒂芬尼诺
Owner EI DU PONT DE NEMOURS & CO
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