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1

Response Surface Modeling of Physical and Mechanical Properties of Cotton Slub Yarns

Qadir M. B., Malik Z. A., Ali U., Shahzad A., Hussain T., Abbas A., Asad M., Khaliq Z.

Autex Research Journal

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2018

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Vol. 18, no. 2

173--180

EN

The objective of this study was to model the physical and mechanical properties of 100% cotton slub yarns commonly used in denim and other casual wear. Statistical models were developed using central composite experimental design of the response surface methodology. Yarn’s linear density, slub thickness, slub length and pause length were used as the key input variables while yarn strength, elongation, coefficient of mass variation, imperfections and hairiness were used as response/output variables. It was concluded that yarn strength and elongation increased with increase in linear density and pause length, and decreased with increase in slub thickness and slub length. Yarn mass variation and total imperfections increased with increase in slub thickness and pause length, whereas yarn imperfections and hairiness decreased with increase in slub length. It was further concluded that due to statistically significant square and interaction effects of some of the input variables, only the quadratic model instead of the linear models can adequately represent the relationship between the input and the output variables. These statistical models will be of great importance for the industrial personnel to improve their productivity and reduce sampling.

2

Predicting Specific Stress of Cotton Staple Ring Spun Yarns: Experimental and Theoretical Results

Zubair M., Neckář T. B., Malik Z. A.

Fibres & Textiles in Eastern Europe

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2017

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Vol. 25, no. 2 (122)

43--47

EN

The aim of this research is to predict the yarn specific stress from fiber specific stress and fiber stress utilisation. In this paper a new approach is introduced to predict the specific stress-strain curves of cotton carded and combed yarns. The force on single fiberis worked out and these fiber forces are combined together to obtain forces acting on yarn. The theoretical model introduces the utilisation of fiber stress on the basis of the fiber specific stress-strain curve, twist angle, fiber directional distribution parameter C and contraction ratio. A comparison of experimental results suggests that the specific stress-strain curves predicted have reasonable agreement with the experimental yarn specific stress-strain curves for all types of yarns. Thus this model is valid to predict the specific stress-strain curves for carded and combed cotton ring spun yarns.

PL

W pracy przedstawiono sposób przewidywania krzywych naprężeń przędzy bawełnianej. Siły oddziaływujące na pojedyncze włókna pozwalają określić siły działające na przędzę. Model teoretyczny opiera się na krzywej naprężenia włókna, kącie skrętu, współczynnikach podziału kierunkowego włókna i kontrakcji. Porównanie wyników eksperymentalnych wskazuje, że przewidywane specyficzne krzywe naprężenia dobrze korelują z danymi eksperymentalnymi dla wszystkich typów przędzy. Przedstawiony model może być stosowany w przewidywaniu krzywych naprężeń dla przędz bawełnianych.

3

Use of Taguchi Method and Grey Relational Analysis to Optimize Multiple Yarn Characteristics in Open-End Rotor Spinning

Hussain T., Arain F., Malik Z. A.

Autex Research Journal

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2017

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Vol. 17, no. 1

67--72

EN

Rotor speed and twist per metres (tpm) are two key parameters in open-end rotor spinning of cotton yarns. High spinning productivity can be obtained by keeping the rotor speed high and twist level as low as possible. However, too high rotor speed may result in yarn imperfections and too low twist level may result in lower tenacity yarns. This study aimed at optimising the multiple yarn characteristics in open-end rotor spinning using the Taguchi method and the grey relational analysis. Cotton yarn samples of 30 tex were produced on rotor spinning machine with different twist levels (i.e. 500, 550, 600 and 700 tpm) at different rotor speeds (i.e. 70,000, 80,000, 90,000 and 100,000 rpm) according to the Taguchi design of experiment. Optimal spinning process parameters were determined using the grey relational grade as the performance index. It was concluded that for the cotton fibres and yarn count used in this study, optimum properties of the yarns could be obtained at 90,000 rpm rotor speed and 700 tpm.

4

Effect of sewing parameters and wash type on the dimensional stability of knitted garments

Malik M. H., Malik Z. A., Hussain T., Ramzan M. B.

Autex Research Journal

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2013

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Vol. 13, no. 3

89--94

EN

The aim of this research is to study the effect of clothing manufacturing parameters, that is, stitch type, stitch density, sewing thread type and washing type on the dimensional stability of single jersey knitted garment. Single jersey bleached fabric, made from Ne 32 cotton combed ring spun yarn, was used to make 32 medium size crew neck T-shirts selecting two levels of stitch type, stitch density, sewing thread type and wash type according to the experimental design. After constructing the garments, four critical measurements of each garment, that is, body length, body width, across shoulder and sleeve length were measured. The constructed garments were divided into two equal groups. One group was washed with water and the other group was washed using a detergent. After washing, drying and tumbling, the same critical measurements of each garment were taken and the percent shrinkage was calculated. Analysis of data was done on responses of output variables against the input variables using MINITAB. The results showed that three input variables: stitch type, stitch density and garment wash type have significant effect on all the output variables.