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    Ergonomic risk analysis of working postures for a textile factory worker
    (Çanakkale Onsekiz Mart University, 2024) İmamoğlu, Güler; Esi, Bestem
    The textile sector significantly contributes to total employment and exports in our country. At the same time, it has a production structure that is labor-intensive and where most of the work is done manually and repetitively. As a result of shift work and long working hours in textile production, some musculoskeletal disorders occur in employees due to non-ergonomic posture and repetitive movements. Untreated and neglected musculoskeletal disorders cause more serious problems for employees in the long term. In this study, ergonomic risk assessment was conducted using the Rapid Entire Body Assessment Method for the working postures of textile workers working in the weaving department of a textile factory. Thus, potential risk factors and ergonomic strain levels exposed to employees were determined. As a result of the research, it was determined that the employee was exposed to high risk, and precautions needed to be taken quickly. In addition, some recommendations were made to prevent musculoskeletal disorders and loss of productivity in the business through some precautions.
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    Investigation of tensile strength and elongation properties of chenille upholstery fabrics including recycling polyester yarns
    (Sage Publications Ltd, 2020) Esi, Bestem; Duru Baykal, Pınar
    Every day, millions of plastic and polyethylene terephthalate bottles are being thrown away by people. This leads not only to the reduction of landfills and increase in environmental problems but also to pollution of marine and oceans that affect the lives of many living things. Therefore, recycling of waste polyethylene terephthalate bottles with recycling technologies has great environmental importance. In this study, recycled polyester yarns obtained by recycling waste polyethylene terephthalate bottles and standard polyester yarns were used in staple forms, as well as binder and pile yarns of the chenille yarn structure. In this context, 16 different chenille yarns were produced and the production parameters such as rotor speed, spindle speed, and pile density are kept constant by selecting the appropriate values. Then, these chenille yarns were used as weft to produce upholstery fabrics. Tensile strength and elongation tests were applied to the upholstery fabrics, and the results were evaluated statistically. As a result of the tensile strength tests and statistical analyses, it is concluded that the weft breaking strength of all types of woven fabrics, which have 100% recycled polyester in the structures of chenille yarns as weft, is slightly decreased compared to other types, but this decrease is not statistically significant. The use of recycled polyester yarns in the structures of chenille yarns, which are widely used in the upholstery sector, will be beneficial in producing more sustainable and eco-friendly fabrics.
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    Optimization model for tensile strength prediction in woven upholstery fabrics containing recycled PP
    (Multidisciplinary Digital Publishing Institute (MDPI), 2026) Esi, Bestem
    The increasing environmental impact of the textile industry has led to the development of sustainable production methods. One of the effective approaches is the use of recycled fibers, which helps to save resources, reduce carbon emissions, and support the circular economy. This study investigates the feasibility of producing durable upholstery fabrics incorporating recycled polypropylene (r-PP) and virgin polypropylene (v-PP). Filament yarns with varying r-PP/v-PP blend ratios, produced by the melt spinning process, were used as weft yarns, while commercially available virgin polyester filament yarns were employed in the warp direction for all fabric samples. Performance tests in accordance with the standards were applied to the fabrics and the results were also evaluated statistically. The results show that acceptable performance is achieved in some mechanical properties if similar blend ratios and production parameters are used. In the study, an optimization model was developed to maximize the weft breaking strength using the equations obtained from the regression analyses. With the help of the mathematical model created, the values of other physical and performance properties of the fabric depending on the maximum breaking strength value could be estimated without the need for trial production. The model was solved using Lingo 18.0 optimization software. The solution of the model revealed that the optimum weft yarn blend ratio is 10/90 r-PP/v-PP, and the maximum weft breaking strength value is 562.45 N.
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    Optimization of the yarn slippage at the seam in chenille upholstery fabrics including recycled and virgin polyester yarns
    (Ege University, 2022) Esi, Bestem; Baykal, Pınar Duru
    In this study, it is aimed to establish an optimization model that minimizes the seam slippage in chenille upholstery fabrics using recycled and virgin polyester yams. For this purpose, 32 chenille yams were produced in two different pile lenghts by using r-PET and virgin polyester yams in binder and / or pile structure and then, these chenille yams were used as weft to produce chenille upholstery fabrics. Tests have been performed in accordance with the standards to determine the physical and performance properties of woven fabrics. Statistical analyzes were made using the data obtained as a result of the tests, and equations that express each variable mathematically were created with the help of regression analysis of performance characteristics. Lingo 18.0 software was used to solve the optimization model. In the solution of the model, while the amount of seam slippage was minimized within the constraints, optimum values of some physical and performance properties of the fabrics such as count of binder and pile yam, pile length, weft tensile strength, weft tear strength, stiffness were obtained. The use of recycled (r-PET) yams in binder and/or pile yams of chenille in fabrics did not affect the warp seam slippage values.