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Topics - Alamgir Hossain

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Science and Information / Reduction of end Breakage in spinning
« on: July 23, 2013, 12:44:14 PM »
End breakage is a common phenomenon in spinning. It is one the basic ways to increase profit and quality in the ring spinning process is to keep the end breakage rate to a minimum level. The end breakage rate is a critical spinning parameter that not only affects the maximum spindle speed but may also indicate the quality of yarn, the mechanical condition of the machine and the quality of raw materials. Therefore, it is an important parameter which determines the overall working of a spinning mill.

Substantial research works have been carried out to predict likely end breakage rates in ring spinning. Most of these are based on large numbers of simplifying assumptions and complexity of calculations. Moreover, in many cases, they do not reflect the results which are compatible with the actual situation.

To reduce end breaks, the following aspects should be taken into consideration:

I. Since end breakage in ring spinning is related to slippage of fibres at the spinning triangle as a result of peaks occurring in the spinning tension fibre, the grip at the front drafting rollers should be increased by having a higher top roller pressure. The use of softer cots also enhances the grip at the front rollers. If the total pressure on the rollers cannot be increased, the grip at the front rollers nip can be improved by reducing the width of the cots.

II. A reduction in friction between ring and traveller could reduce the peak tension during the rotation of the traveller.

III. Measures should be taken to reduce the mass irregularity of yarn straight after carding.

IV. The width of the drafted ribbon at the front roller nip should be reduced.

Textile science, events, trade and issues / "Poor man's cotton"
« on: November 23, 2011, 01:28:15 PM »
Cotton is the main natural fibre and it has been used in versatile area in textile sector. The annual consumption of cotton fibre has reduced recently due to increased price of cotton fibre. It has noticed that some synthetic fibre getting importance in place of cotton fibre. The most interesting news is that in the last few years the demand and consumption of polyester fibre is larger than cotton fibre.
       The applications of polyester fibres are wide spread. It can be effectively used in home furnishings for products like carpets, curtains, pillow cases, upholstery etc, in industrial textiles, in auto motive industries, and mainly in the apparel industry. In the apparel industry, polyester fibres are used in every form of clothing due to its easy caring, and maintenance facility. It is widely used in garment manufacturing because of its tenacity, and durability. Since these fibres can be molded into any shape, certain insulating properties can be easily built in the fibre.

        Polyester is the current main synthetic fibre globally. The price of polyester is low and it can be used in many aspects. So, it is rightly called as the “poor man’s cotton”.

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