Person: ÇELİK, ÖZGE
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ÇELİK
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ÖZGE
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Publication Experimental investigation of effect of balloon length on yarn tension during unwinding(Emerald Group Publishing Ltd, 2019-08-05) Çelik, Ozge; ÇELİK, ÖZGE; Eren, Recep; EREN, RECEP; Mühendislik FakültesiPurpose Yarns of different types are unwound from bobbins in different processes like warping, weaving, doubling and re-winding. It is required that yarn tension remains constant during unwinding in all these processes. Otherwise, it ends with product quality and process efficiency problems. The purpose of this paper is to investigate experimentally the effect of balloon length on yarn tension change with respect to bobbin diameter during unwinding in an attempt to obtain a minimum yarn tension variation. Design/methodology/approach An experimental set up was built. Bobbin diameter was measured by a laser sensor and yarn tension was measured by a single yarn tension sensor. Both sensor outputs were interfaced to a PC via a DAQ cad. A software program was developed in C programming language to read and record the tension and bobbin diameter simultaneously. Experimental study was conducted with three different balloon lengths for both continuous filament and spun yarns of four different yarn numbers and five different unwinding speeds. Findings Results showed that yarn tension change with bobbin diameter was affected in different ways with balloon length depending on yarn number, unwinding speed and yarn type. Originality/value Available literature on the effect of balloon length on yarn tension bobbin diameter relation is limited and measurements were generally conducted for three different bobbin diameters. Yarn tension bobbin diameter relation is obtained in this research for at least eight different diameters and more for three different balloon lengths covering practical application ranges. The results obtained can be used in the design of tension control system for warping and winding machines as well as for setting these machines for optimum efficiency.Publication Analysis of hardness variations in radial and longitudinal directions of bobbins in step precision winding(Ege Üniversitesi, 2019-01-01) Çelik, Özge; Eren, Recep; ÇELİK, ÖZGE; EREN, RECEP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JCO-0392-2023; CPO-1051-2022Step precision winding is a widely used bobbin winding method in industry, especially for dyeing bobbins. It is important to adjust winding parameters in an optimum way to obtain optimum hardness variation and best dyeing performance. Main winding parameters are winding pressure, crossing angle and yarn tension. This paper presents a research investigating the effect of main winding parameters on hardness distribution in radial and longitudinal directions of bobbins wound with step precision winding. Bobbins are produced from Ne 30/1 and Ne 10/1 cotton yarns. Bobbin hardness is measured by a new instrument called UNITORQ, which enables the measurement of relative bobbin hardness in radial and longitudinal directions with small increments of distance. It is found that crossing angle affects mainly longitudinal hardness variation while radial hardness variation is determined and affected in a large variation interval by winding tension. Winding pressure is seen to have no significant effect on winding hardness distribution in both radial and longitudinal directions but it determines bobbin hardness level together with winding tension and crossing angle.Publication Experimental investigation of the relationship between the yarn tension and bobbin diameter in the warping process(Inst Chemical Fibres, 2019-01-01) Çelik, Özge; Eren, Recep; ÇELİK, ÖZGE; EREN, RECEP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JCO-0392-2023; CPO-1051-2022Yarns of different types are unwound from bobbins in different processes like warping, weaving, doubling and re-winding. A change in yarn tension from a full to empty bobbin causes serious product quality and machine efficiency problems in processes like weaving and winding. This paper investigates experimentally the relationship between yarn tension and bobbin diameter in the warping process. For this purpose, an experimental set up was built with a laser sensor measuring the bobbin diameter, a tension sensor for measuring yarn tension, a bobbin winding unit, PC, and DAQ cant A software program was developed in the C programming language to read and record the tension and bobbin diameter simultaneously. The unwinding speed and yarn number both had a significant effect on the relationship between the yam tension and bobbin diameter. The effect of the unwinding speed became more pronounced with yarns getting thicker.Publication Experimental investigation of the performance of a feedback tension control system designed for warping machines(Ege Univ, 2019-10-01) Eren, Recep; EREN, RECEP; İhtiyar, Merve; Çelik, Ozge; ÇELİK, ÖZGE; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; JCO-0392-2023This paper presents a research work which investigates experimentally the performance of a tension control system realized by a controlled disc brake. An experimental set-up was established by using a creel with step motor-controlled disc brake, laser distance sensor, yam tension sensor and a 2-unit winding machine. A software was developed in C programming language to read yarn tension and bobbin diameter data and then to control the disc brake by step motor drive. Experimental investigation was carried out with three different cotton yarn counts and unwinding speeds. It was shown that yarn tension changed from full to empty bobbin at a significant amount depending mainly on yarn number and unwinding speed. The feedback tension control system based on adjusting level of braking responded well to short, medium and long term tension variations and enabled unwinding tension control mostly within +/- 1 cN deviation from the adjusted value.