The increasing interest in karate has also attracted the attention of researchers, especially in combining the equipment used by practitioners with technology to prevent injuries, improve technical ...skills and provide appropriate scoring. Contrary to the sport of taekwondo, the development of a smart body protector in the sport of karate is still a niche field to be researched. This study focused on developing piezoresistive, textile-based pressure sensors using piezoresistive film, conductive fabric as well as different bonding materials and methods. Primarily, small-scale sensors were produced using ultrasonic welding, hot press welding and oven curing. These were characterized using a universal testing machine and specific conditioning and data-acquisition hardware combined with custom processing software. Large-scale sensors were then manufactured to be placed inside the karate body protector and characterized using cyclic testing. The conditioning circuit allows flexible gain adjustment, and it was possible to obtain a stable signal with an output of up to 0.03 V/N, an adequate signal for the tested force range. The transfer function shows some drift over the cycles, in addition to the expected hysteresis and slight nonlinearity, which can be compensated for. Finally, the configuration with the best results was tested in real practice tests; during these tests the body protector was placed on a dummy as well as on a person. The results showed that the piezoresistive textile-based pressure sensor produced is able to detect and quantify the impact of even light punches, providing an unobtrusive means for performance monitoring and score calculation for competitive practice of this sport.
In recent years, with the increase in global awareness of environmental problems, the term “sustainability” became more important for apparel manufacturers and consumers. Therefore, recycling of ...wastes plays a significant role in environmental sustainability by converting the wastes into raw materials. This study focused on recycled cotton-included fabrics, to evaluate the effect of these fabrics on thermal comfort properties. In this context, first, the 45% recycled cotton/55% polyester blended yarns and 50% virgin cotton/50% blended yarns were obtained. Afterwards, single jersey and rib-structured fabrics were knitted using these yarns. The thermal comfort tests were performed on the fabrics and four long sleeve rounded neck shirts then were manufactured using these fabrics to test by the thermal manikin method. Results showed that the yarns including recycled cotton led to a decrease in the values in air permeability of the fabrics and in the effective clothing insulation of the garments. In contrast, it was observed that, including recycled cotton increased the thermal resistance values of the fabrics.
Additive manufacturing (AM) is a 3D printing technology that works by deposition of a material, layer by layer, creating 3D objects. The growth of these technologies has been exponential and the ...application of AM in the textile industry has also been a subject of increased interest in the past few years. The applications are not only for decorative purposes, but also for biomedical and other uses in e-textiles. However, a crucial point for making such assembly is the adhesion between the material and the textile substrate, as well as the premise of meeting demanding wash resistance requirements. This work aims to investigate the possibility of creating sensors by combining textiles with conductive polymeric filaments used in 3D printing. Merging the flexibility of use, mechanical properties and electrical conductivity of the polymeric filaments with the comfort and physical properties of the textiles can be a promising approach to create novel sensing structures. In this document, we give an overview of the recent state of the art of experimental research on adhesion in textile and polymer composites as well as an optimization of the printing parameters with a conductive filament, PI-ETPU. Some results from the printed samples in terms of print quality and electrical resistance are presented. Combining both topics, further work will include printing with conductive filament on textile substrates to study the possibly of creating sensing and electrical connections.
Eklemeli üretim (EÜ), bir malzemenin katman katman birleştirilmesiyle 3 boyutlu (3B) nesnelerin oluşturulmasını sağlayan bir 3B baskı teknolojisidir. Bu teknolojilerin ilerlemesi katlanarak artmıştır ve özellikle son yıllarda EÜ’nün tekstil endüstrisinde uygulanması da artan bir ilgi konusu haline gelmiştir. Uygulamalar sadece dekoratif amaçlı değil, aynı zamanda biyomedikal ve e-tekstil ürünlerinde de gerçekleştirilmektedir. Bununla birlikte, malzeme ile tekstil yüzeyi arasındaki yapışmanın yanı sıra eklemeli üretim için önemli noktalardan biri de zorlu yıkama direnci gereksinimlerini karşılama konusudur. Bu kapsamda gerçekleştirilen bu çalışmada, tekstil yüzeylerinin 3B baskıda kullanılan iletken polimerik filamentlerle birleştirilmesiyle sensör oluşturma olasılığının araştırılması amaçlanmıştır. Polimerik filamentlerin kullanım esnekliğini, mekanik özelliklerini ve elektriksel iletkenliğini tekstil malzemelerinin konforu ve fiziksel özellikleriyle birleştirmek, yeni algılama yapıları oluşturmak önemlidir. Bu çalışmada, öncelikle tekstil yüzeyleri ile polimerlerin birleştirilmeleri üzerine yapılan deneysel araştırmaların yanı sıra iletken bir filament olan PI-ETPU için baskı parametrelerinin optimizasyonu hakkında bir genel bakış sunulmuştur. Çalışmada daha sonra, gerçekleştirilen 3B baskı ile üretilen numunelerin baskı kaliteleri ve elektriksel direnç değerleri ile ilgili bazı sonuçlar verilmiştir. Her iki konuyu birleştirecek şekilde ileriki çalışmalar, algılama ve elektrik bağlantıları oluşturma olasılığını incelemek üzere farklı tekstil yüzeyleri üzerine farklı iletken filamentler ile baskı çalışmalarının gerçekleştirilmesi üzerine olacaktır.
This study aims to determine the best fabric structure containing recycled fibre for a daily use summer t-shirt considering the physical and comfort properties through a multi-criteria decision ...making methodology. Herein, 12 cotton fabric and 12 polyester fabric structures contained different blend ratios of virgin fibre, recycled fibre and elastane were generated. Alternatives were tested according to the 10 criteria assessed by 20 experts and were ranked Measurement of Alternatives and Ranking according to the Compromise Solution (MARCOS) method. The air permeability and mass per unit area were weighted as the two most important criteria. Supportively, 80/20% BCI Co/ r-Co blended fabric (A11) among cotton alternatives, 100% r-PET blended fabric (A21) among polyester alternatives were ranked as the best fabric alternatives providing desired test results. Furthermore, it was determined that composition ratios of the fabric had no direct effect on ranking. This study proved that MARCOS method is a convenient and useful tool under the conditions of finite alternatives and conflicting criteria.
Recycling and reusing of textile waste as a resource can be an important opportunity to reduce environmental pollution and make a great contribution to sustainable development of society. Recycling ...cotton waste makes it low-priced and high return value. This way it can be easily industrialized and commercialized to extend the life cycle of cellulose resources. The aim of this research was to investigate the performance properties of fabrics made from recycled cotton and virgin polyester blends. The fabrics were knitted using different knitting constructions while keeping the yarn count and fabric content constant. The study focused on evaluating the pilling and elasticity properties of the fabrics and the effect of knit structure on these properties. Especially pilling is one of the performance characteristics that fabric manufacturers receive feedback from their customers and as it is stated in the literature, it should be improved. The results showed that knitting type had a significant impact on pilling and elasticity values. It was observed that the napping process negatively affected the pilling property as it caused mechanical deformation in the fabric. The findings of this research can help manufacturers and designers to select the appropriate knitting construction to achieve the desired performance properties in fabrics made from recycled cotton and virgin polyester blends. This research contributes to the ongoing efforts to promote sustainable practices in the textile industry.
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