Industrial hemp (Cannabis sativa) is one of the most available and widely produced bast fibers with high cellulose content. Interest in these fibers is warranted due to environmental protection challenges as well as their inherent properties such as low density, high specific strength, and stiffness. In addition, advanced research and progress have gone into increasing their mechanical performance through surface treatments and in the development of new materials. The most promising application for hemp fibers is as reinforcement in polymeric composites or through hybridization. Nonetheless, more research is needed to improve their properties and expand their range of applications. The biodegradability issue is one problem that must be addressed when considering long life-cycle applications as the reproducibility of these composites’ final properties. This review is a comprehensive literature review on hemp fibers. It includes hemp fibers’ chemical and mechanical properties, surface modifications, hybrid composites, as well as current and future applications.

Hemp fibers derived from Cannabis sativa L. have experienced a resurgence in popularity over the past few decades, establishing themselves as one of the most sought-after fibers. This article delves into the intricacies of the hemp production chain, offering a comprehensive understanding from field to fiber. Key aspects covered include the botany of hemp, cultivation requirements, the impact of various factors on plant growth, the harvesting process, different methods of fiber extraction, fibers properties, and suitable spinning processes. Recent studies of hemp’s Life Cycle Assessment are explored, shedding light on how it compares to other sustainable crops and providing insights into the true sustainability of hemp, substantiated by numerical data. The article also addresses challenges encountered throughout the hemp production chain and speculates on future directions that may unfold in the coming years. The overall goal of this study is to provide a knowledge base encompassing every facet of hemp fiber production. It elucidates how different technological approaches and the technical properties of fibers play pivotal roles in determining their ultimate applications. By offering a comprehensive overview, this article contributes to the broader understanding of hemp as a valuable and sustainable resource in the textile industry.

The nonwoven industry is undergoing significant changes, driven by rapid growth and sustainability concerns, with a growing need to shift from fossil-based polymers like polyester (PES) and polypropylene (PP) fibres to biodegradable, fossil-free materials. Compared to other cellulose-based fibres, lyocell (LY) is a promising solution due to its good mechanical performance and lower environmental impact. Additionally, cellulose acetate (CA) fibres, known for their thermoplastic and biodegradable properties, can act as a binder, offering another promising alternative to fossil-based fibres. This study explores the use of 100% LY fibres, alone and in blends with CA and recycled polyester (rPES) fibres, in the development of needle-punched nonwovens and assesses the mechanical benefits of adding a thermal bonding step. Among the blends, rPES-based nonwovens with thermal bonding showed the best results. 100% LY exhibited the best mechanical performance among needle-punched nonwovens, while rPES-based blends outperformed the others. Biodegradability and toxicity studies were also performed. 100% LY nonwovens fully biodegraded within 55 days, and 100% CA and 100% rPES showed no biodegradation. The findings revealed that the thermal process did not affect the disintegration level and, the germination of Brassica oleracea was not affected by soils in which the samples were buried for 75 days.

Due to the continuous optimization of cutting plans, the cotton scrap size resulting from the cutting of components for clothing production (post-industrial residues) is often considered insufficient to obtain fibres with the proper length to produce a new yarn through mechanical recycling processes; so it is important to search for other applications for these wastes. In this context, small pieces of cotton were submitted to a shredding process to obtain recycled fibres. Cotton small pieces and recycled fibres were then submitted to a refining process to achieve refined fibres. Using these materials alone and in blends with refined and unrefined bleached eucalyptus kraft pulp (BEKP), wet-laid nonwovens were developed and characterized. An analysis of the results revealed that the replacement of unrefined BEKP by 70% cotton waste fibres in wet-laid nonwovens, reducing the use of virgin raw material, enhances the structures’ mechanical properties by 80% and 14%, for small pieces or recycled fibres, respectively. Additionally, refining small pieces of cotton seems to be more promising than refining recycled fibres, because less steps are required to obtain wet-laid nonwovens with better mechanical properties. These results highlight the potential of this approach to be explored further for different products and end applications.

Natural fibres have garnered substantial attention because of their eco-friendly attributes and versatility, offering a sustainable alternative to synthetic ones. This review surveys plant fibres, including flax, hemp, jute, banana, and pineapple, emphasizing their diverse properties and applications in nonwoven materials. This research also examines the use of synthetic polymer composites blended with natural fibres to create high-performance nonwoven materials. Furthermore, this review outlines the primary applications of nonwovens manufactured with plant fibres through needle-punching. These applications span geotextiles, automotive interiors, construction materials, and more. The advantages, challenges, and sustainability aspects of incorporating natural fibres in needle-punched nonwovens are discussed. The focus is on mechanical and thermal properties and their adaptability for specific applications. This research provides valuable insights for researchers and industry professionals aiming to leverage the benefits of plant fibres in needle-punched nonwovens across various sectors.