Person: EREN, RECEP
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EREN
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RECEP
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Publication Development of a test device for measuring tensile properties of fabrics(Ege Univ, 2016-01-01) Hasçelik, Barış; Eren, Recep; EREN, RECEP; Mühendislik Fakültesi; Tekstil Mühendisliği Ana Bilim DalıA tensile tester for textile materials has been designed, manufactured and its performance tested. Horizontal construction is preferred in the design. Servo motor and ballscrew drive is used in the drive of movable clamp and elongation of test sample is calculated from servo motor motion and gear-ballscrew kinematics. Tension is measured by load cells of different measuring intervals. Software routines have been developed for different tests including load-elongation (or stress-strain) curve, tension change under constant elongation, creep test and force and elongation lost under cyclic loading. It is shown that load-elongation curves obtained from the developed device and Instron 4301 are close to each other. But some deviations exist. This is taught to be due to the bending in the movable clamp and mechanical imperfections. With the improvement of rigidity of the device and mechanical imperfections, the device is expected to give test results of commercially available ones in the market.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 Experimental investigation of sensorless tension control system for textile processes(E.u. Printing And Publishing House, 2023-01-01) Bayraktar, İsmail; Eren, Recep; EREN, RECEP; Sadoun, Mohamad Y.; Mühendislik Fakültesi; Tekstil Mühendisliği BölümüSensorless tension control system is investigated for textile processes and machines in this paper. A prototype unit unit was designed and manufactured for this aim. Prototype unit consisted of winding and unwinding warp beams driven by a servomotor and an induction motor. Warp tension was measured by load cells for evaluating the sensorless tension control system performance. Diameters of winding and unwinding warp beams were measured by laser sensors. Wound warp length was measured by an incremental encoder fitted to the shaft of a cylinder rotated by warp yarns. Number of beam rotations of warp beams were measured by separate inductive switches. A software program was developed in LabVIEW to implemet sensorless tension control algorithms and record the performance data. Results showed that the desired tension can be kept constant within 5% deviation limits by the servomotor torque control.Publication Regenerated cellulose woven fabric reinforced hydrogel composite(Taylor, 2021-03-29) Koç, Ümit; Aykut, Yakup; Eren, Recep; Koç, Ümit; AYKUT, YAKUP; EREN, RECEP; Mühendislik Fakültesi; Tekstil Mühendisliği Bölümü; 0000-0002-9061-3040; JTV-2018-2023; G-2674-2016; CPO-1051-2022This study evaluates the effects of different aqueous borax solutions on the morphology, mechanical, thermal and chemical properties of regenerated cellulose fiber woven fabric reinforced hydrogel composites. The fabric reinforced hydrogel composites were fabricated with PVA/viscose ring, PVA/viscose open-end (viscose OE), PVA/viscose continuous filament (viscose CF) blended woven fabrics. Mechanical tests results showed that regenerated cellulose fiber woven fabric reinforced hydrogel composites made from PVA/viscose CF (380 N) exhibited better mechanical performance than its viscose ring (258 N) and viscose OE (318 N) counterparts. Another significant result, evaluated using statistical package for social sciences (SPSS) data analysis showed that there was a high level positive and meaningful relationship between borax-water concentration and breaking force at the breaking points of regenerated cellulose woven fabric reinforced hydrogel composites in the warp direction. The results have suggested that the regenerated cellulose fabric reinforced hydrogel composites with enhanced mechanical properties could be used as agricultural water retention materials and in geotextiles applications.Publication The evaluation of experimental studies about weavability limit(Pamukkale Univ, 2005-01-01) Turhan, Yıldıray; Eren, Recep; EREN, RECEP; Mühendislik FakültesiIn this paper, some experimental studies about the weavability limits are evaluated. Firstly, fabrics and loom parameters which were considered during these studies are pointed out and then, the results showing how these parameters affect the weavability limits and comparisons with earlier theoretical studies are presented. In conclusion, new experimental studies about the subject are suggested.Publication Analysis of thermo-physiological comfort properties of 100% acrylic, acrylic/cotton, acrylic/viscose and acrylic/pes blended woven fabrics(Inst Natl Cercetare-dezvoltare Textile Pielarie-bucuresti, 2019-01-01) Yavasçaoğlu, Arzu; Eren, Recep; EREN, RECEP; Şule, Gülcan; SÜLE, GÜLCAN; Mühendislik Fakültesi; Tekstil Mühendisliği BölümüIn this study, thermo-physiological comfort properties of woven fabrics produced with % 100 acrylic, cotton, viscose and PES weft as well as acrylic/PES, acrylic/cotton and acrylic/viscose weft mixing were investigated. For this purpose, 35 different fabrics were woven with acrylic warp and acrylic, cotton, PES, viscose, acrylic/cotton, acrylic/viscose and acrylic/PES weft yarns, with three different weft densities and plain, twill and satin weaves. Analysis of results showed that the effect of yarn material and weft density on thermal resistance was not observed. It was seen that weave type had an effect on thermal resistance, thermal absorbtivity and air permeability of the fabrics. Air permeability values of fabrics woven with plain weave were lower than those of satin and twill weaves. The air permeability decreased when weft density was increased. According to statistical evaluation, yarn type or yarn material had significant effect and weft density and weave had no significant effect on water vapour resistance.Publication Investigation of mechanical properties of a novel green composite developed by using enset woven fabric and bioresin materials(Springer, 2023-07-12) Temesgen, Alhayat Getu; Eren, Recep; EREN, RECEP; Aykut, Yakup; AYKUT, YAKUP; Mühendislik Fakültesi; JTV-2018-2023The developments of environmental concerns and regulations have pushed most of the composite industries to revisit natural resources. They have focused on natural fibers as a reinforcing material having low cost, low density and good mechanical strengths. Enset woven fabric is manufactured from enset fibers, which are abundantly available, light weight (1.2 g/cm(3)), moderate moisture content (10%) and biodegradable un-utilized new fiber under Ensete Ventricosum family. This research work focused on investigating mechanical properties of a new green composite fabricated by enset woven fabric reinforcement and specially prepared bioresin from plant gums. The tensile strength of the enset fabric was improved four times from 528 to 2074 N in single-layer composite structure, while double-layer composite tensile strength was obtained as 3480 N. The test results indicated that the laboratory-made bioresin matrix from acacia and frankincense gums had a significant effect on the mechanical strength of composite structures compared with enset fabrics having the same number of threads (warps) in the specimens. Increasing the grammage of bioresin restored energy and improved the performance of tensile and flexural strength by reducing the deformation of composite structures. Generally, this study revealed that enset woven fabric as reinforcing structure and mixed acacia-frankincense bioresin as a matrix materials had a promising result to be used as composite materials in light weight structural applications with the same potential to improve its performance.Publication One-step preparation of woven fabric-reinforced hydrogel composite(Sage Publications, 2021-02) Koç, Ümit; Aykut, Yakup; Eren, Recep; AYKUT, YAKUP; EREN, RECEP; Koç, Ümit; Mühendislik Fakültesi; 0000-0002-9061-3040; G-2674-2016; JTV-2018-2023; CPO-1051-2022Cotton-woven fabric-reinforced polyvinyl alcohol-based hydrogel composite was produced by constructing cotton as warp and polyvinyl alcohol/cotton hybrid and polyvinyl alcohol yarns as weft yarns in the fabric structure. As-prepared polyvinyl alcohol/cotton fabrics were treated with different concentrations of aqueous borax and glutaraldehyde crosslinking solutions. Polyvinyl alcohol molecules were transformed to crosslinked gel structure after the treatments. Since cotton yarns kept their yarn structure in the fabrics, woven fabric-reinforced hydrogel composites were obtained. Chemical analysis to investigate crosslinking was conducted by attenuated total reflection-Fourier transform infrared spectroscopy spectra analysis, and the results revealed that a proper crosslinking of polyvinyl alcohol molecules in polyvinyl alcohol yarns occurred by using both borax and glutaraldehyde as crosslinkers. Thermal stabilities of the samples were observed via thermogravimetric analysis measurements. Even though borax crosslinking increased the thermal stability, glutaraldehyde crosslinking did not have a significant effect on the thermal stability of hydrogel composite. Crystalline microstructural analysis was carried out with X-ray diffraction measurement. Tensile properties of the samples by focusing on the crosslinker ratio and water contents in the hydrogel composites were performed. The results revealed that tensile properties of hydrogel composite tremendously increased with fabric reinforcement. Also, breaking force gradually increased when the hydrogel composite structure released the water from its structure at both borax and glutaraldehyde samples. Since the produced fabric-reinforced hydrogel composites have high strength, they are promising candidates as hygroscopic materials for planting and erosion control at inclined terrains.Publication Yarn-reinforced hydrogel composite produced from woven fabrics by simultaneous dissolution and cross-linking(Sage, 2021-02-01) Koç, Ümit; Eren, Recep; Aykut, Yakup; Koç, Ümit; EREN, RECEP; AYKUT, YAKUP; Fen Bilimleri Yüksekokulu; Tekstil Mühendisliği; 0000-0002-9061-3040; JTV-2018-2023; G-2674-2016; CPO-1051-2022Polyvinyl alcohol (PVA)/cotton (Co) woven fabrics were produced by constructing Co as warp yarns and PVA as weft yarns in the fabric structure. As-prepared PVA/Co fabrics were treated with borax/water solution. Because of the simultaneous dissolution and gelation of PVA yarn in the fabric and transformation of PVA molecules into cross-linked gel structures, gel penetrated among the yarns in the matrix form and hence Co yarn-reinforced composite hydrogels were obtained. The retention time of water by composite hydrogels was first increased and then decreased by increasing borax concentration in the cross-linker solution. With yarn reinforcing, the tensile strength of hydrogel structure significantly increased. Mechanical properties of hydrogel composites were very variable depending on water content in the structure and tensile strength tremendously increased when water evaporated from the structure. Thermal and chemical characterizations of yarn-reinforced hydrogel composites were conducted in addition to swelling and mechanical analysis to investigate the performance of the hydrogel composites.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.