Load-Elongation Properties of Filaments in a Multifilament Yarn

Different techniques used for the mass coloration of polyester fibers are discussed in this article. Dope-dyed fibers have been produced starting from PET bottle wastes. Dope dyeing has been carried out both by the incorporation of pigments during drying before melt extrusion and by masterbatch addition. Fibers produced using different pigments and at different add-ons have been evaluated for color fastness properties and loss of mechanical properties due to dope addition. It has been shown that fibers having excellent fastness properties with little loss in mechanical properties could be obtained by either of these techniques. Fibers produced by recycling PET bottle wastes have been compared with those obtained by recycling polyester fiber wastes and virgin fiber grade polyesters melt spun under identical conditions. It has been demonstrated that bottle wastes yield fibers having properties equivalent to those of virgin polyester but probably cost similar as fiber wastes. Molded automotive carpets developed from recycled fibers from PET bottle wastes have shown excellent mechanical and fastness properties. It is inferred that using dope-dyed fibers based on PET bottle wastes in automotive applications may ensure a high benefit to cost ratio.

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“…Lower cost of coloring . Colored yarns can be textured without any adverse effect on the shade [6,7].…”

Section: Mass Coloration Of Polyestermentioning

confidence: 99%

Dope-dyed Polyester Fibers from Recycled PET Wastes for Use in Molded Automotive Carpets

Gurudatt¹,

De²,

Rakshit³

et al. 2005

Journal of Industrial Textiles

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“…Therefore, in an earlier paper [2], we used the load elongation diagram of a multifilament yarn to arrive at the mechanical properties of the individual filaments in the yam. We developed a technique which gives these properties from breaking steps in a load-elongation diagram of a multifilament yarn.…”

mentioning

confidence: 99%

“…We developed a technique which gives these properties from breaking steps in a load-elongation diagram of a multifilament yarn. In this technique, the tenacity value of a filament (TBALF) is obtained from the average load on the filament [2].…”

mentioning

confidence: 99%

“…· All the samples were conditioned (65% RH, 25°C) before we recorded their load-elongation diagrams on the Instron tensile tester (rate of elongation, 10 cm/ minute for undrawn yarn and 5 cm/minute for all other yarns; gauge length, 5 cm). For each sample, we used 10 recordings to compile the distribution data on load-at-break (or TBALF) and elongation-to-break of individual filaments in a multifilament yarn [2]. .…”

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confidence: 99%

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Load Elongation Properties of Filaments in a Multifilament Yarn

Datye¹,

Mishra²

1985

Textile Research Journal

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This paper describes the technique of finding the distribution of load-at-break and elongation-to-break of filaments in a multifilament yarn from the breaking steps in a load-elongation diagram. There is a correlation between the distribution data and the performance of undrawn nylon 6 yarn on the draw-twisting machine. The distribution in the drawn yarn is correlated with that of the undrawn yarn. The effect of spinning speed of the filament yarn on the distribution is brought out using lowspeed spun nylon 6 yarn and MOY and POY polyester. The effect of the hot water relaxation process and aqueous dyeing process on the distribution is also studied.The behavior of individual filaments in a bundle is not the same as that of the filaments tested individually. Therefore, in an earlier paper [2], we used the load elongation diagram of a multifilament yarn to arrive at the mechanical properties of the individual filaments in the yam. We developed a technique which gives these properties from breaking steps in a load-elongation diagram of a multifilament yarn. In this technique, the tenacity value of a filament (TBALF) is obtained from the average load on the filament [2].In this paper, we have studied the effect of postspinning operations on the mechanical properties of multifilament nylon 6 and moderately and partially oriented polyester yarns by examining the distribution of tenacity (TBALF) and elongation-to-break as obtained by the technique mentioned above. The effect of the relaxation process on the distribution has also been studied by treating the drawn nylon 6 yarn with boiling water and under conditions of dyeing.Materials and Methods ' . The following yams produced commercially by J. K. Synthetics Ltd., India, were collected at various stages of their manufacture: (a) undrawn nylon 6 yarn (143 denier, 10 filaments), (b) undrawn nylon 6 yam (385 denier, 24 filaments) and its corresponding drawn yam ( 111 denier, 24 filament, zero twist), (c) moderately oriented (MOY) polyester yam ( 136 denier, 34 filaments) and the corresponding sequentially drawtextured yam (85 denier, 34 filaments), and (d) partially oriented (POY) polyester yarn (102 denier, 34 filaments) and the corresponding simultaneous drawtextured yam (85 denier, 34 filaments). Based on their performance on the draw-twisting machine, yams were classified as good, acceptable, and unworkable. The yarn was good when it stretched without any breakage in a draw-twisting machine. If the yam broke frequently it was rejected as unworkable. A yam with occasional breaks was acceptable.The relaxed samples were obtained as follows: (e) the drawn sample (b) was further treated with hot water (95°C, 4 seconds at 30 m/minute), and (f) the drawn sample (b) was dyed after winding on a collapsible spring with CI Acid Blue 113 (Erionyl Blue S5R) ( 1.S g/1, I:100::M:L ratio, at boil, 1 hour) in the conventional manner. · All the samples were conditioned (65% RH, 25°C) before we recorded their load-elongation diagrams on the Instron tensile tester (rate of elongation, 1...

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