http://nopr.niscpr.res.in/handle/123456789/67939 Sun, 11 Oct 2026 13:06:12 GMT 2026-10-11T13:06:12Z http://nopr.niscpr.res.in/handle/123456789/67970 Title: Comparative Analysis of Structural, Thermal, and Electrical Characteristics of Virgin and Recycled Polyester Yarns Authors: ÖZKAN, Ýlkan; İLHAN, İlhami Abstract: This study presents a comprehensive comparison between virgin and recycled polyester yarns in both filament and staple forms, focusing on their mechanical, electrical, thermal, and structural properties. Yarn samples produced from mechanically recycled PET bottles and virgin polyester were evaluated in terms of tensile strength, elongation, and surface resistivity. In addition, thermal behavior was analyzed using thermogravimetric analysis (TGA), and crystallinity was examined through X-ray diffraction (XRD). The results showed that recycled polyester yarns exhibited lower tensile strength but higher elongation than virgin counterparts. Recycled samples also demonstrated lower surface resistivity, indicating better electrostatic dissipation characteristics. TGA revealed a lower decomposition temperature and higher residual mass in recycled samples, while XRD analysis confirmed reduced crystallinity compared to virgin polyester. These findings provide valuable insight into the performance characteristics of recycled polyester yarns and their suitability for various applications within sustainable textile production. Page(s): 167-175 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/67970 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/67969 Title: Influence of Fly Ash and abaca fibre reinforcement on the mechanical and physical properties of polypropylene composites Authors: Gode, Ravindra; Gaval, Vivek; kakad, Dattatraya Abstract: The growing demand for sustainable and high-performance materials has sparked significant interest in hybrid composites that incorporate natural fibres and industrial waste products. This study focuses on the fabrication and evaluation of polypropylene (PP) composites reinforced with abaca (Musa textilis) fibres and fly ash (FA) as a filler, with and without a compatibilizer. Composite samples were fabricated with different fibre contents while keeping the FA loading constant. Standard ASTM dimensions were used for preparing the specimens required for experimental testing. Mechanical and physical properties, including tensile, flexural, impact strength, hardness, density, water absorption, and void content, were systematically evaluated. Field Emission Scanning Electron Microscopy (FESEM) analysis of the tensile fracture surfaces revealed that the addition of a compatibilizer improved the fibre–matrix interfacial adhesion and reduced the number of voids. The results demonstrated that composites with 7.5–10 wt.% abaca fibre and 3 wt.% compatibilizer exhibited optimal performance. This study provided the potential of abaca fibre and FA-based PP composites as lightweight, supportive sustainable material for applications in automotive, packaging, and consumer products. Page(s): 176-186 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/67969 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/67968 Title: Sustainable and energy-efficient dyeing of esterase-treated polyester with reactive dyes Authors: Chetal, Sumit; Chakraborty, JN; Yadav, Anilkumar Abstract: The conventional high-temperature, high-pressure (HTHP) dyeing of polyester with disperse dyes is energy-intensive (~1580 kcal/kg fabric), time-consuming, and requires specialized machinery while producing harmful, dye-laden effluents. The issue is more pronounced with polyester cotton blends, as polyester requires disperse dyeing at high temperature while cotton requires reactive dyes, both in aqueous media, necessitating separate or sequential dyeing steps that increase water, energy, and chemical consumption. This study presents a cleaner, energy-efficient alternative through the enzymatic surface modification of polyester using Esterase enzyme. The treatment introduces reactive -OH and -COOH groups, enabling dyeing with cold-brand reactive dyes, which are water-soluble, self-hydrolyzing, and require much less energy (~201 kcal/kg fabric). Treatment parameters, enzyme concentration, time, temperature, and pH, were optimized, and FTIR analysis confirmed successful functionalization. The modified polyester showed enhanced absorbency, reduced wicking height and contact angle, and better dye affinity without compromising fabric strength. Dyeing at 40-45 °C achieved 60-70% energy savings over the HTHP process. This method also eliminates the need for high-pressure machinery, reduces process complexity, and lowers effluent load due to the environmentally benign nature of reactive dyes. The dyed fabrics exhibited uniform shades, good color fastness, and moderate K/S values. Overall, this strategy supports sustainable, eco-efficient textile processing. Page(s): 187-198 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/67968 2026-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/67967 Title: Design and development of the angular lenticular brick motif woven fabric panels by weaving, double-layering, stitching, and foam tube wadding techniques Authors: G Panneerselvam, R; Mohamed Zakria, G; Sankar, K; Prakash, C Abstract: Angular Lenticular Panel (ALP) technology enables the transformation of one figure into another based on the viewing angle, developed using optical lenses, painted relief surfaces, or folded paper constructions. Recent research has extended this concept to textiles through Angular Lenticular Woven Fabric Panels (ALWFPs), which predominantly relied on elastic yarns to induce surface curvature during weaving, leading to limitations related to material control, dimensional stability, and long-term durability. The present study introduces a novel structural approach for developing ALWFPs without the use of elastic yarns, thereby advancing material innovation in angular lenticular textiles. An analysis of four previously reported ALP technologies revealed three common developmental stages, viz., segmentation motifs of identical dimensions, formation of a curved surface, and alternate placement of segmented motif elements on that surface. Based on these principles, three new ALWFPs were designed and fabricated with brick motifs using conventional heald shedding and extraweft figure techniques. In the proposed method, two motifs were alternately woven into a single fabric. After weaving, the motif fabric was double-layered with a plain backing fabric and stitched to form horizontal hollow cloth tubes. Expanded polyethylene foam (EPEF) tubes were inserted into these channels to generate stable and repeatable curved surfaces. Each panel exhibited a clear angular lenticular effect, wherein one motif was perceived from one viewing direction and the alternate motif from the opposite direction. The developed ALWFPs demonstrate improved structural stability, material flexibility, and design scalability, offering potential applications in functional textiles, interior surfaces, interactive displays, and architectural textile design Page(s): 199-209 Mon, 01 Jun 2026 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/67967 2026-06-01T00:00:00Z