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1

Methodology of Optimum Selection of Material and Semi-Folded Products for Rotors of Open-End Spinning Machine

Płonka Stanisław, Postrożny Jacek, Drobina Robert

Autex Research Journal

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2021

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Vol. 21, no. 4

393--402

EN

The article presents the methodology of optimal selection of material and the form of semi-product for the rotors of the spindle-less spinning machine. The multicriteria approach was utilized taking into account versatile criteria. The applied procedure consists of two stages: the optimum method in the Pareto sense and the method of distance function. Based on the analysis of the spinning head work, rotor and availability function, six different materials and three forms of semifinished products (extruded bar, forged element, and cast element) were considered. In consequence, the admissible set consisting of nine elements was obtained. For the evaluation of technological quality of the rotor, the following criteria were proposed: index of functionality of the material σf/ρ, maximum height of the surface peaks, Sp, and maximal hardness on surface of oxide layer μHV0,1. Finally, taking into account the economical criterion (unit cost), the Pareto-optimal set of solutions was determined based on four criteria. Due to the fact that this set contained five variants, the distance function was utilized for choosing the best final variant. The optimal material and the semi-product (because of the assumed criteria) chosen were as follows: alloy AlSi1MgMn and the forged element - because in this case the value of distance function was minimal.

2

Simulation of Reliability Prediction Based on Multiple Factors for Spinning Machine

Li Chen, Liu Rongxing, Pan Fukui

Autex Research Journal

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2020

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Vol. 20, no. 1

17--23

EN

Reliability prediction of spinning machines can result in a time-saving and cost-saving development process with high reliability. Based on an analysis of failure times among systems and subsystems, a simulation method for reliability prediction of spinning machines is proposed by using the Monte Carlo simulation model. Firstly, factor weights are determined according to the fuzzy scoring and analytic hierarchy process. According to the status of reliability growth, growth coefficients are proposed based on reliability influencing factor weights and fuzzy scoring. To achieve the prediction of reliability distribution law, reliability index, and fault frequency, the reliability prediction model is constituted by combining the reliability growth coefficient and the Monte Carlo simulation model. Simulation results for spinning machines are obtained via the model thus built, which are confirmed with a practical example.

3

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.

4

Wear evaluation of the rotors of open end spinning machines

Płonka S.

Fibres & Textiles in Eastern Europe

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2010

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Vol. 18, no. 5 (82)

44--50

EN

This paper presents the results of an observation and investigation into the wear of the rotors of an open end spinning machine mating with wool yarn in industrial conditions. The rotors were made of alloys EN AW-2024 (AlCu4Mg1) and EN AW-6082 (AlSi1MgMn) after a process of hard anodic oxidation in industrial conditions. Analysis of the wear process together with the decrease in the oxide layer thickness before and after the operation certifies that such a layer assures at least a two and a half fold increase in wear resistance. The surface topography and microstructure of the surface layer before and after the period of operation were assessed, which allowed us to establish that the wear of the inner surfaces of the rotor in the collecting groove caused by the friction of impurities and yarn on their surfaces is mainly determined by the abrasive wear.

PL

W pracy zamieszczono wyniki obserwacji i pomiarów zużycia, w warunkach przemysłowych, rotorów przędzarek bezwrzecionowych do wełny i włókien wełnopodobnych wykonanych ze stopu EN AW-2024 (AlCu4Mg1) oraz ze stopu EN AW-6082 (AlSi1MgMn) przed i po procesie utleniania elektrolitycznego twardego. Analiza przebiegu zużywania się oraz grubości warstwy tlenkowej, przed i po okresie eksploatacji, potwierdza, że warstwa tlenkowa zapewnia co najmniej dwuipółkrotny wzrost odporności na zużycie. Ocena topografii i mikrofotografii powierzchni oraz mikrostruktury warstwy wierzchniej, przed i po okresie eksploatacji, pozwala na stwierdzenie, że na zużywanie się powierzchni wewnętrznych rotora w rowku zbiorczym, podczas tarcia zanieczyszczeń i przędzy o te powierzchnie, decydujące znaczenie ma zużycie ścierne.

5

Investigation of energy consumption in yarn production with special reference to open-end rotor spinning

Kaplan E., Koç E.

Fibres & Textiles in Eastern Europe

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2010

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Vol. 18, no. 2 (79)

7--13

EN

The aim of this study is to evaluate the energy consumption, in general, for open-end rotor type yarn manufacturing systems and to examine the energy consumption in a chosen spinning mill by considering available data including installed power as well as monthly and yearly energy usage. A simple theoretical approach for predicting specific energy consumption in a particular yarn type produced in the spinning mill selected has been developed. The results obtained by applying this model to a specific yarn have been compared with relevant values available in literature.

PL

Celem artykułu jest ocena zużycia energii dla produkcji przędz rotorowych. Jak również analiza przykładu określonej przędzalni, uwzględniając dostępne dane w tym zainstalowaną moc oraz roczne i miesięczne zużycie energii. Opracowano prostą teoretyczną metodę przewidywania zużycia energii dla określonego typu przędzy, produkowanej w wybranej przędzalni. Uzyskane wyniki porównano z wynikami podawanymi w literaturze.

6

Analysis of regularized card sliver after short-termlevelling process

Idzik M.

Autex Research Journal

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2010

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Vol. 10, no. 2

35--38

EN

Doubling of sliver has ceased to be the fundamental operation for reducing the weight irregularity of spinning halfproducts, which are decisive for the quality of yarn. Its role has now been taken over by the general use of autolevellers. After leaving the regulation zone, card sliver, whose weight irregularity is reduced by a short-termautoleveller, undergoes a process of relaxation. This phenomenon takes place only in the case of regulated sliver. Unregulated slivers passing through a leveller operating with constant draft show few relaxing properties. One reason why autolevelled card sliver has such relaxing properties may be the variation of the drafting force caused by the continually changing draft. The performance of the short-term card autoleveller cannot be unequivocally evaluated. The main difficulty lies in the time span between levelling and measurement, during which the sliver undergoes relaxation. How quickly the autolevelled card sliver is fed to the next machine in the yarn manufacturing process is therefore important, because in the intervening time the initial irregularity of the product may undergo uncontrolled changes.

7

Computer analysis distribution of the yarn linear density from open end spinning machine

Idzik M.

Autex Research Journal

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2009

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Vol. 9, no. 4

101--104

EN

Basing on a detailed kinematics scheme of the R1 Rieter rotor spinning machine, calculation of spectral characteristics of yarn made on the spinning machine was done. The calculations served to create a computer programme facilitating the qualitative evaluation of the spinning process on the R1 spinning machine. It also allows a rapid localising of mechanical damages and technological errors in the machine. The calculations make it possible to detect the sources of periodical faults and damages of yarn which follow from: the noncentred work of elements of the spinning machine or from their being damaged, from damaged pulleys, gear wheels, driving belts, from dirt or damages of the elements driving the roller etc.

8

Influence of the Type of Montmorillonite and the Conditions of Fibre Formation from a Polyacrylonitrile Nanocomposite on the Fibre Properties

Mikołajczyk T., Boguń M., Szparaga G.

Fibres & Textiles in Eastern Europe

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2007

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Vol. 15, no. 3 (62)

25--31

EN

We investigated the influence of the ultrasound disintegration of montmorillonite (MMT) nanoadditions before inserting them into the spinning solution on the structure and properties of fibres spun from a polyacrylonitril (PAN) nanocomposite. The supermolecular structure, the porosity, and the tenacity were characterised, and the distribution of the nanoaddition on the fibre surface was evaluated. The fibres were formed under conditions related to those for manufacturing fibres with a high tensile strength, and alternatively under conditions appropriate for obtaining fibres with increased porosity, but with tensile strength at a level which would enable their further processing by carbonisation in order to obtain carbon fibres.

PL

Zbadano wpływ ultradźwiękowego rozpraszania nanododatku, przed wprowadzeniem do roztworu przędzalniczego, na strukturę i właściwości włókien z nanokompozytu poliakrylonitrylowego (PAN). Scharakteryzowano strukturę nadmolekularną i porowatość, oznaczono wytrzymałość właściwą oraz oceniono rozkład nanododatku na powierzchni włókien. Włókna formowano w warunkach odpowiadających otrzymaniu włókien o wysokiej wytrzymałości oraz alternatywnie w warunkach odpowiadających uzyskaniu włókien o zwiększonej porowatości, przy zachowaniu poziomu wytrzymałości na poziomie umożliwiającym przeprowadzenie procesu karbonizacji.

9

The application of optical fobres for the measurement of the rotational speed of yarn in the spinning chamber

Zięba J., Kowalczyk L.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

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1999

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z. 57

71-77

EN

In the paper the problem of measurement of the rotational speed of yarn in the spinning chamber has been discussed. To ensure the optimum conditions of break spinning, it is necessary to measure the rotational speed of yarn. To allow the measurement of the latter, an optical waveguide sensor has been built. Its structure and principle of operation has been described and the curves of tensions at the characteristic points of the sensor have been presented.

PL

W pracy opisano zagadnienie pomiaru prędkości obrotowej przędzy w komorze przędzącej. Dla zapewnienia optymalnych warunków procesu przędzenia konieczny jest pomiar prędkości obrotowej przędzy. Do pomiaru prędkości wirowania przedzy zbudowano czujnik światłowodowy. Opisano jego budowę i zasadę działania. Zamieszczono przebiegi napięć w charakterystycznych punktach czujnika.