Person: EREN, RECEP
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EREN
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RECEP
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Publication Evaluation of enset fabric reinforced green composite as sound absorber structure(Ege Universitesi, 2021-04-01) Temesgen, Alhayat Getu; Eren, Recep; Aykut, Yakup; Süvari, Fatih; Temesgen, Alhayat Getu; EREN, RECEP; AYKUT, YAKUP; SÜVARİ, FATİH; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği Bölümü; Bursa Uludağ Üniversitesi, Mühendislik Fakültesi, Tekstil Mühendisliği Bölümü; 0000-0001-5708-7993; 0000-0002-5263-1985; 0000-0001-9389-0281; 0000-0001-7841-2281; JDH-9222-2023; CPO-1051-2022; JTV-2018-2023; N-1770-2019Noise is a problem that should be reduced in a variety of places. Fibrous structures are some of the most commonly used materials for sound absorption applications. Enset fibers have a limited use in technical textile applications especially in packaging sector and are mostly left as an agro waste materials. The aim of this research work was to investigate the acoustic property of this new alternative natural fiber (fabric) and its green composite material. The sound absorption performance of enset fabric and its green composite was determined with impedance tube method. The porosity and void structure of enset fibers were studied by scanning electron microscope (SEM) for analysis of enset fabric and enset fabric reinforced composite sound dissipation mechanism. The sound absorption coefficient of enset fabric could only reach to 0.5 level with 5 layers of enset fabric after 3500 Hz frequency. Composite structures with increasing number of fabric layers decreased sound absorption frequency interval. With 5 layers composite (5 fabric layers in the composite), a sound absorption coefficient remained over 0.5 at a large frequency interval between 2830 and 6000 Hz while it was reaching to 0.9 at around 2500 Hz frequency. Increasing the ratio of bio resin to enset fabric caused the sound absorption behavior of composite material tend to shift from higher to medium frequency regions.Publication Regenerated cellulose woven fabric reinforced hydrogel composite(Taylor, 2021-03-29) Koç, Ümit; Aykut, Yakup; Eren, Recep; Koç, Ümit; AYKUT, YAKUP; EREN, RECEP; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği Bölümü; Bursa Uludağ Üniversitesi/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 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; Bursa Uludağ Üniversitesi/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 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; Uludağ Üniversitesi/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 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; Bursa Uludağ Üniversitesi/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 Investigation of the effect of pique weave on auxetic performance and related fabric properties(Taylor, 2021-09-22) Akgün, Mine; Eren, Recep; Süvari, Fatih; Yurdakul, Tuğba; AKGÜN, MİNE; EREN, RECEP; SÜVARİ, FATİH; Yurdakul, Tuğba; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Tekstil Mühendisliği; 0000-0001-5708-7993; N-1770-2019; CBU-3381-2022; GIA-1705-2022Re-entrant structures are known to perform an auxetic effect. It was aimed in this paper to investigate the Poisson's ratio of the woven pique structures because of the re-entrant lozenge effect of the weave. Sound absorption, air permeability, and synclastic properties of the fabrics concerning the auxetic properties of pique structures were also examined. In evaluating the synclastic behavior, the drape ability and bending rigidity of the fabrics were assessed. Pique weave fabrics were subjected to tensile tests, and the changes in fabric unit cell at different tensile strains were observed in the warp and weft directions. Experimental results showed that the auxetic effect was produced in the warp direction. A high negative Poisson's ratio (NPR) was obtained in cotton pique fabrics under low elongation values. It was observed that the yarn floating lengths and the yarns intersecting region widths forming the re-entrant lozenge pattern had effects on fabrics' NPR.Publication Effect of different yarn combinations on auxetic properties of plied yarns(Walter, 2021-10-15) Akgün, Mine; Eren, Recep; Süvari, Fatih; Yurdakul, Tuğba; AKGÜN, MİNE; EREN, RECEP; SÜVARİ, FATİH; Yurdakul, Tuğba; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü; 0000-0001-5708-7993; N-1770-2019; CBU-3381-2022; CPO-1051-2022; GIA-1705-2022This study presents the effects of a novel plied yarn structure consisting of different yarn components and yarn twist levels on the Poisson's ratio and auxetic behavior of yarns. The plied yarn structures are formed with bulky and soft yarn components (helical plied yarn [HPY], braided yarn, and monofilament latex yarn) and stiff yarn components (such as high tenacity [HT] and polyvinyl chloride [PVC]-coated polyester yarns) to achieve auxetic behavior. Experimental results showed that as the level of yarn twist increased, the Poisson's ratios and the tensile modulus values of the plied yarns decreased, but the elongation values increased. A negative Poisson's ratio (NPR) was obtained in HT-latex and PVC-latex plied yarns with a low twist level. The plied yarns formed with braid-HPY and braid-braid components gave partial NPR under tension. A similar result was achieved for yarns with HT-latex and PVC-latex components. Since partial NPR was seen in novel plied yarns with braided and HPY components, it is concluded that yarns formed with bulky-bulky yarn components could give an auxetic performance under tension.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; Bursa Uludağ Üniversitesi/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.Publication Green synthesis of cellulosic nanofiber in enset woven fabric structures via enzyme treatment and mechanical hammering(E.u. Printing And Publishing House, 2021-01-01) Eren, Recep; EREN, RECEP; Temesgen, Alhayat Getu; Aykut, Yakup; AYKUT, YAKUP; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Anabilim Dalı.; JTV-2018-2023The rapid development of technology in textile industries has been improving textile finishing properties such as durability, water replants and breathability. Enset is effectively un-utilized agro-waste fiber composed of cellulose, hemicellulose and lignin, which are resemblance to banana fibers. This paper focused on the utilization of enset waste materials for the production of nano fiber. Enset nano fiber (ENF) was fabricated by defibrillation of raw fibers from the surface of enset woven fabrics into micro and nano-scale fibers by a-amylase enzyme treatment and then mechanical hammering. Instead of sandwiching the nanofiber mats between conventional woven fabrics, in this research work, nanofiber mats were manufactured on the surface of the conventional woven fabrics. This top-down nanofabrication approach is simple, cost-effective and environmentally friendly nanofiber manufacturing technique from the surface of woven fabric structures. Fiber characterization was done by fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). The surface area, pore size and pore volume of enset nano fiber was analyzed by brunauer, emmett and teller (BET). The test results revealed that nano fiber fabrication was significantly affected by the used enzyme concentration and applied mechanical power. Enset micro fiber was formed when 10 % (w/v) concentration of alpha-amylase enzymatic treatment was applied while enset nano fibers were formed when the enzyme concentration was increased to 15% - 20 % (w/v). The FTIR results revealed that hemicellulose and lignin were effectively removed and fine fibers were defibrillated from the crystal structure of enset woven fabrics. The SEM microscopic image also confirmed the formation of the enset nano fiber ranges from 660nm-63 nm.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.; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Tekstil Mühendisliği Bölümü.Sensorless 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.