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1

An Investigation on the Performance of Modified Coir Spinning Machine

Velayutham Thanabal, Dhandapani Saravanan

Autex Research Journal

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2019

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Vol. 19, no. 3

211--216

EN

Coir fibre is a non-conventional fibre extracted from the husk of coconut fruit and is abundantly available in tropical countries. Coir yarn is produced in the decentralised cottage industry. Increase in the demand for the coir fibre yarns for value-added applications has forced the coir yarn manufacturers to improve the existing coir spinning machine in different ways. In this study, the working principle of the existing coir spinning machine has been studied from the perspective of further improvements in production rate, yarn quality and spinning performance. Modifications have been made in the existing coir spinning machine in fibre feeding, opening and cleaning. There is improvement in the production rate of up to 20% with significant improvements in the yarn quality and spinning performance.

2

The effect of feed particle size on breakage rate parameter in a pilot scale ball mill

Erdem S. A., Ergun L. S., Benzer H. A.

Inżynieria i Aparatura Chemiczna

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2009

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Nr 4

34-37

EN

The paper presents investigation results of feed particle size effects on the breakage ratę parameter in a pilot-scale ba]] mili. The specific ratę of breakage was calculated for each test by modelting of grinding process in a milt. The resutts revealed that breakage ratę increased with the increase of particle size within a certain size rangę and then de-creased despite the further increase of particle size. This tendency takes a similar pattern irrespective of a top ball size but the particle size at maximum breakage occurred as dependent on a top bali size in all tests. Consequent)y, the feed particle size is strongly related to the top baH size in bali media, which allows one to achieve optimum mili per-formance.

PL

Artykuł przedstawia rezultaty badań, w półprzemysłowym młynie kulowym, wpływu rozmiaru ziaren nadawy na szybkości rozdrabniania. Rozdrabnianie prowadzono w sposób okresowy. Następnie określono szybkość rozdrabniania, modelując proces mielenia. Wyniki badań dla wszystkich testów pokazały, że szybkość rozdrabniania wzrasta wraz ze wzrostem wielkości ziarna, w określonym przedziałe rozmiarowym, a następnie spada pomimo wzrostu wymiaru ziarna. Największe szybkości przemiału występują dla największych kuł, we wszystkich prowadzonych testach. Wskazuje to również, iż rozmiar ziaren jest silnie uzależniony od rozmiaru największych mielników, które pozwalają uzyskać optymalne warunki mielenia.

3

The mechanism of end breakage in ring spinning: a statistical model to predict the end break in ring spinning

Ghosh A., Ishtiaque S., Rengasamy S., Patnaik A.

Autex Research Journal

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2004

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Vol. 4, no. 1

19--24

EN

The mechanism of end breakage in ring spinning is a complex phenomenon, and is entirely different from the yarn failure mechanism during a tensile test. In this paper a possible mechanism of end breakage is reported. A statistical model is developed for predicting the likely end breakage rate in ring spinning. The important factors in governing end breaks are the mean yarn strength, yarn strength variation, mean value of the peak spinning tensions and the variation of yarn mass irregularity. Some practical aspects have also been discussed to tackle the problem of when the breakage rate suddenly increases.