The increasing demand for cleaner coloration of synthetic textiles has renewed interest in plant-based dyes; however, limited dye–fiber affinity and shade durability remain major challenges in nylon dyeing. This study developed a mordant-free dyeing process for nylon fabric using Terminalia catappa leaf extract by optimizing extraction pH, dyebath pH, dyeing time, and temperature. Mature T. catappa leaves were aqueously extracted under acidic, neutral, and alkaline conditions, followed by systematic dyeing optimization. The dyed fabrics were evaluated using color strength (K/S), CIELAB color coordinates, standard fastness tests, FTIR spectroscopy, and FE-SEM analysis. Alkaline extraction followed by acidic dyeing produced the highest dye uptake. The optimum condition was extraction pH 11, dyebath pH 3, 120 °C, and 60 min, yielding a maximum K/S value of 21.94 with ΔL, Δa, and Δb values of −54.25, 8.03, and 24.92, respectively. FTIR and SEM results supported possible dye–fiber interaction through hydrogen bonding, electrostatic attraction, and surface/inter-filament dye deposition without obvious fiber damage. The optimized fabric showed very good washing, dry rubbing, perspiration, and saliva fastness, good light fastness, excellent ultraviolet protection, and slightly lower wet rubbing fastness. Overall, T. catappa leaf extract offers a promising mordant-free route for durable nylon coloration.

Thermal insulating materials are necessary for buildings, automobiles, and industrial operations to be cool and energy-efficient. Traditional insulation materials are usually made from synthetic polymers, known to release toxic fumes and are not readily biodegradable. Sustainable green materials are progressively more significant as the need for energy preservation and environmental conservation increases. In this line, a sustainable bio-composite comprised of coir fiber (CF) and natural latex suitable for thermal insulation purposes has been developed and is presented in this study. The composites were produced with varying CF content (10%−50%) to determine the optimum fiber-to-latex ratio for improved mechanical and thermal properties. These results indicate that the mechanical properties were improved by CF incorporation, and the optimal tensile strength, elastic modulus, and maximum breaking force were recorded at 40% CF addition (Coir-Latex Composites-4). In addition, the thermal conductivity of CLC-4 was 0.04411 W/m·K, which was 22.55% lower than conventional thermal insulating materials (Poly-Ethylene foam). It also shows strong thermal stability in the thermogravimetric examination with a high residue (17.7%) at 600°C, indicating good thermal resistance. Latex helped to reduce CF hydrophilicity and water uptake with advantages at high CF contents. Fiber-matrix adhesion was confirmed by Field-Emission Scanning Electron Microscopy (FESEM), showing adequate distribution and concentration at lower fiber loadings. The mechanical properties of the material deteriorated when the CF content exceeded 40%. Therefore, the CLC composite presents an eco-friendly alternative to conventional insulation materials, having the complementary features of enhanced mechanical strength, low thermal conductivity, and biodegradability, making it a sustainable insulation for construction and energy-efficient applications.

Labeling is crucial for enabling customers to identify and purchase apparel items accurately by providing necessary and reliable product information. However, conventional apparel labels, produced using various fibers and processes, have significant environmental and economic impacts. To address these challenges, replacing conventional labels with printed Quick Response (QR) codes presents a unique, eco‐friendly, and sustainability‐oriented alternative. This study evaluated the feasibility of using QR code labels with screen printing, as well as direct‐to‐film (DTF) transfer printing techniques. DTF prints on cotton and polyester retained complete scannability with a recognition time of around 1 s and good‐to‐excellent color fastness (Grade 4–5) after five wash cycles. On the other hand, screen‐printed labels on polyester failed after three washes and on cotton after two to three. Although DTF prints were somewhat rigid, they were still within tolerable comfort ranges. The results showed that DTF printing outperformed screen printing in clarity and durability. Although the printed fabric exhibited slightly increased stiffness, the fastness properties were acceptable and had minimal impact on user comfort. Therefore, conventional fabric labels may be replaced by DTF‐printed QR code labels. This eco‐friendly labeling method reduces auxiliary material inputs, enhances transparency and traceability for textile and apparel products, and promotes more sustainable manufacturing through emerging circular‐economy practices while improving consumer engagement with product information through digital integration.