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Textile fibres
Published in Michael Hann, Textile Design, 2020
Coir fibre is extracted from coconut husks. When sourced from fully ripened coconuts, a brown-coloured fibre results and, when taken from yet-to-ripen coconuts, a white or pale-brown fibre is the outcome. The brown-coloured fibre type is exceedingly coarse, not too flexible, though stronger than cotton and resilient to abrasion; it is used predominantly in hard-wearing brushes. Meanwhile, the white or pale-brown coir fibre type is softer (and less strong) and may be twisted into rope or woven into floor mats. Fibres have good resistance to both microbial attack and salt water. Important producers include India and Sri Lanka as well as Brazil, Indonesia, Vietnam, Thailand and the Philippines, where, typically, in each case, the fibres are harvested from coconuts grown by small-scale farmers and subsequently extracted by local mills. Other types of plant fibre include those found within stems or leaves. The former is known as bast fibre and the latter simply as leaf fibre. Typical bast fibres include flax, jute, hemp, ramie, kenaf, nettle and banana, and leaf fibres include sisal, abaca (or Manila hemp) and pina. Each is considered further below.
Recycled HDPE Composites
Published in P. C. Thomas, Vishal John Mathai, Geevarghese Titus, Emerging Technologies for Sustainability, 2020
B. Abhijith, Abin John, Abin Manichan Aloysious, George Joseph, Rakesh Jose
The required composites are prepared by mixing HDPE in matrix form with reinforcements such as coir pith, carbon black and glass fiber in different weight ratios. The reinforcements are taken in different weight ratios (5, 10, 20%) in the weighing machine. The additional materials like OHP sheet and mould (7×5×2 mm) are further required for the preparation. Used HDPE covers are collected and are shredded. Total of 500gm shredded HDPE is taken into the preparation. Coir is a natural product and is extracted from the coconut husk. This coir pith is made by drying the coir and is made into the powdered form for the reinforcement. The required weight of coir pith powder required is about 30gm carbon black powder is taken as reinforcement. Glass fiber of 30gm is also further required for the preparation.
Durability study on coir geotextiles embedded in different pavement conditions
Published in Sheela Evangeline, M.R. Rajkumar, Saritha G. Parambath, Recent Advances in Materials, Mechanics and Management, 2019
Akhila Vijayan, Y. Sheela Evangeline, Ajin Krishna
Coir is a versatile, cost-effective and biodegradable lignocellulosic natural fiber extracted from the husk of coconut abundantly available in southern part of India, Srilanka, Indonesia etc. Coir geotextile made from coir fibres are usually used in Civil Engineering applications especially in pavements. Based upon the production of fibre, the coir fibre is classified into retted coir and brown coir. The retted coir fibre has higher tensile strength to that of brown fibre. The coir fibre diameter ranges from 0.1 to 0.8 mm and length of individual fibre varies widely. It is more durable compared to other natural fibres as it has higher lignin content.
A homogenized finite element analysis of the deformation of multicellular thin-walled epoxy/coir fiber-reinforced aluminum 6063 composite tubes
Published in Mechanics of Advanced Materials and Structures, 2023
The selected matrix material is aluminum alloy 6063 which is an age-hardenable alloy with medium to high strength properties is considered a suitable energy absorber for the current investigation due to its dynamic deformation behavior and high strain rate sensitivity [34]. In light of pursuing a lightweight design objective, the metallic alloy is amalgamated with a reinforcement phase composed of an epoxy/coir fiber system. Coir fiber is an agro waste material that poses little or no environmental concerns, it is reproducible and inexpensive, possessing good fracture toughness characteristics and can be stretched beyond the elastic limit without rupture. It is essentially biodegradable with a metal-foam filler characteristic, hence a potentially viable energy absorption material [35, 36]. The pictorial representation of the coconut mesocarp (coir) fiber is shown in Figure.1, while the chemical compositions of the matrix alloy and coir fiber [37] are shown in Tables 1 and 2, respectively. The epoxy resin is a bonding agent that is resilient and tough, the polymer is compatible with natural fibers, and can prevent shrinkage and preserve their properties during curing.
Gaseous mercury capture by coir fibre coated with a metal-halide
Published in Journal of the Air & Waste Management Association, 2020
Damien N. McCarthy, Grant C. Edwards
The use of renewable resources for environmental remediation of heavy metals makes sense from an economic and environmental perspective. Coir is derived from the mesocarp of germinated fruit of the coconut palm (Cocos nucifera), is a readily available renewable resource available in bulk at low cost, and has useful properties such as high tensile and flexural strength. It can readily be made into rope and matting by facile mechanical processes and is widely used as a geotextile. However, when employed as a geotextile, being cellulosic, coir is prone to chemical and biological degradation over time mediated by fungi, bacteria, and substrate characteristics (Balan 1995; Lekha 2004). This degradation can be reduced by various fiber surface modifications and other treatments (Nicholas 1982; Suni, Unnikrishnan, and Mathew 2016).
Triaxial test on saturated sands reinforced with coir products
Published in International Journal of Geotechnical Engineering, 2019
Dharmesh Lal, N. Sankar, S. Chandrakaran
Much of the attention now is focused on the use of natural products as a substitute for synthetic reinforcement materials (Arvind and Deepak 2016; Butt, Mir, and Jha 2016; Lal, Sankar, and Chandrakaran 2017c). Natural products being environmental friendly, cost-effective biodegradable and easily available should be preferred over polymeric synthetic reinforcement materials. Coir being a biodegradable and environment-friendly material is an excellent replacement for its synthetic counterparts. Based on the durability studies on coir, researchers (e.g. Rao and Balan 2000; Lekha and Kavitha 2006) have recommended that the longevity of coir is quite satisfactory to serve as a reinforcement material. The advantages of coir products include easy availability, economic price range, eco-compatibility, excellent engineering and hydraulic properties. So far, however, there has been little discussion about the use of coir products as a reinforcement material (e.g. Ajitha and Jaydeep 1997; Subaida, Chandrakaran, and Sankar 2009; Vinod, Ajitha, and Sreehari 2009). Sivakumar Babu, Vasudevan, and Sayida (2008) reported an improvement in properties of expansive soils with the addition of coir reinforcement.