Bamboo textile

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A scarf made of bamboo yarn and synthetic ribbon Seascarf.jpg
A scarf made of bamboo yarn and synthetic ribbon

Bamboo textile is any cloth, yarn or clothing made from bamboo fibres. While historically used only for structural elements, such as bustles and the ribs of corsets, in recent years different technologies have been developed that allow bamboo fibre to be used for a wide range of textile and fashion applications.

Contents

Examples include clothing such as shirt tops, pants, and socks for adults and children, as well as bedding [1] such as sheets and pillow covers. Bamboo yarn can also be blended with other textile fibres, such as hemp or spandex. Bamboo is an alternative to plastic that is renewable and can be replenished at a fast rate.

Modern clothing labeled as being made from bamboo is usually viscose rayon, a fiber made by dissolving the cellulose in the bamboo, and then extruding it to form fibres. This process removes the natural characteristics of bamboo fibre, rendering it identical to rayon from other cellulose sources. Only products made directly from bamboo fiber should carry the "bamboo" label. [2]

Different forms of bamboo-derived fiber

Bamboo fibres are all cellulose fibre extracted or fabricated from natural bamboo, but they vary widely.

Textiles labelled as being made from bamboo are usually not made by mechanical crushing and retting. They are generally synthetic rayon made from cellulose extracted from bamboo. Bamboo is used whole and in strips; these strips may be considered stiff fibers.

Stiff strips

Kinhyoshi yorin (Yang Lin), hero of the Suikoden, holding a bamboo hat, from Utagawa Kuniyoshi's series of woodblock prints illustrating the 108 Suikoden Suikoden.jpg
Kinhyōshi yōrin (Yang Lin), hero of the Suikoden, holding a bamboo hat, from Utagawa Kuniyoshi's series of woodblock prints illustrating the 108 Suikoden

Bamboo can be cut into thin strips and used for basketry. [3]

In China and Japan, thin strips of bamboo were woven together into hats and shoes. One particular design of bamboo hats was associated with rural life, worn mostly by farmers and fishermen for protection from the sun. [4]

An 1881 bustle design Dimitybustle1881.gif
An 1881 bustle design

In the West, bamboo, alongside other components such as whalebone and steel wire, was sometimes used as a structural component in corsets, bustles and other types of structural elements of fashionable women's dresses. [5]

Bamboo rayon

Rayon is a semi-synthetic fiber made by chemically reshaping cellulose. Cellulose extracted from bamboo is suitable for processing into viscose rayon (rayon is also made from cellulose from other sources).

Bamboo leaves and the soft, inner pith from the hard bamboo trunk are extracted using a steeping process and then mechanically crushed to extract the cellulose. [6] The viscose rayon process then treats the fibers with lye, and adds carbon disulfide to form sodium cellulose xanthate. After time, temperature, and various inorganic and organic additives (including the amount of air contact) determining the final degree of polymerization, the xanthate is acidified to regenerate the cellulose and release dithiocarbonic acid that later decomposes back to carbon disulfide and water. [7]

Viscose manufactured from bamboo is promoted as having environmental advantages over viscose made with cellulose extracted from wood pulp. Bamboo crops may be grown on marginal land unsuitable for forestry; demand for bamboo has sometimes led to clearing forests to plant bamboo. But this is less common since Chinese forestry policy reforms in the 1990s. [8] The viscose processing results in the same chemical waste products as wood-pulp viscose, notably carbon disulfide. But bamboo cellulose is suitable for a closed-loop viscose process that captures all solvents used. [8]

Workers are seriously harmed by inhaling the carbon disulfide (CS2) used to make bamboo viscose. Effects include psychosis, heart attacks, liver damage, and blindness. Rayon factories rarely give information on their occupational exposure limits and compliance. Even in developed countries, safety laws are too lax to prevent harm. [9] [10] [11]

Issues

Occupational safety

There are health threats from rayon manufacture. Bamboo rayon manufacture, like other rayon manufacture, exposes rayon workers to volatile carbon disulfide. Inhaling it causes serious health problems. Around 75 percent of all polluting emissions from the bamboo viscose process occur as air emissions. [12] [2] [13]

While it is possible to protect workers from the CS2, some legal limits for occupational exposure are still far higher than recommended by medical researchers. Rayon factories vary widely in the amount of CS2 they expose their workers to, and in the information they give about their safety limits or their compliance. [9] [8]

False advertising

In the U.S., the Federal Trade Commission (FTC) has ruled that unless a yarn is made directly with bamboo fibre — often called "mechanically processed bamboo"—it must be called "rayon" or "rayon made from bamboo". [2] [14] The U.S. Environmental Protection Agency (EPA) noted that the manufacturing process further purifies the cellulose, alters the physical form of the fibre, and modifies the molecular orientation within the fibre and its degree of polymerization. The end product is still cellulose, [15] and is functionally identical to rayon made from cellulose from other plant sources.

Agricultural

Bamboo can be cultivated quickly, [16] can be used as a cash crop in impoverished regions of the developing world. It is a natural fibre (as opposed to popular synthetics like polyester) whose cultivation results in a decrease in greenhouse gases. [17] There may be environmental problems with the cultivation of land expressly for bamboo plantations. [18]

Anti-bacterial claims

Even though bamboo fabrics are often advertised as antibacterial, finished bamboo fabric only retains some of bamboo's original antibacterial properties. Some studies have shown rayon-bamboo to possess a certain degree of anti-bacterial properties. Studies in China (2010) and India (2012) have investigated the antibacterial nature of bamboo-rayon fabric against even harsh levels of bacteria such as Staphylococcus aureus and Escherichia coli . While the Indian study found that "bamboo rayon showed excellent and durable antibacterial activities against both gram-positive and gram-negative bacteria", the Chinese study concluded "the bamboo pulp fabric just like cotton fabric has not possessed antimicrobial property". [19]

The FTC has charged companies with false antimicrobial claims when the fibre has been made with rayon. [20] Critics cite the cotton industry's powerful lobbying groups in influencing the FTC decision, and dismissal of the international studies proving otherwise.[ citation needed ]

Mechanically produced fine bamboo fiber

Tufts of retted bamboo fibers for sale at Kottiyoor Temple in Kerala Bamboo flower maker at her shop at Kottiyoor.jpg
Tufts of retted bamboo fibers for sale at Kottiyoor Temple in Kerala

Some bamboo fibre is made by a mechanical-bacterial process similar to retting flax into linen fibre. [21] In this way, the woody part of the bamboo is crushed mechanically before an enzyme-retting and washing process is used to break down the walls and extract the fibre. The natural enzyme comes from pre-existing microorganisms on the bamboo. [22] This bast fibre is then spun into yarn. [23] In fine counts the yarn has a silky touch. The same manufacturing process is used to produce linen fabric from flax or hemp. Bamboo fabric made from this process is sometimes called bamboo linen. The natural processing of litrax bamboo allows the fibre to remain strong and produce a high quality product. This process gives a material that is very durable.[ citation needed ]

Another means of extracting fibre from bamboo, and probably the only purely mechanical process of extraction anywhere in the world, is practiced in the days preceding the annual festival of the Kottiyur Temple of Kerala, India. The handcrafted bamboo artifact, known locally as "odapoovu" is in the form of a tuft of white fibres of up to 30 cm (1 ft) in length. The article is made out of newly emerging Ochlandra travancorica culms, which go through a process of alternating pounding with stones and retting in water lasting several days, followed by a combing to remove the pith, leaving the cream white fibres and a stub of the bamboo. The fibre is too coarse and the process very cumbersome, to be of much use in making fine yarn, thread or textiles.[ citation needed ]

Material properties

Mechanically produced bamboo fiber and bamboo rayon have markedly different properties. They look different under a scanning electron microscope (the mechanically produced fiber has nodes). [24] Bamboo rayon varies in physical properties, as would be expected from the range of properties in other rayon. [25]

Bamboo composite and biopolymer construction

There are various approaches to the use of bamboo in composites and as an additive in biopolymers for construction. In this case, as opposed to bamboo fabrics for clothing, bamboo fibres are extracted through mechanical needling and scraping or through a steam explosion process where bamboo is injected with steam and placed under pressure and then exposed to the atmosphere where small explosions within the bamboo due to steam release allows for the collection of fibre. Bamboo fibre can be in a pulped form in which the material is extremely fine and in a powdered state.[ citation needed ]

Ecological considerations

Growth

Bamboo has many advantages over cotton as a raw material for textiles. Reaching up to 35 metres (115 ft) tall, bamboo is the largest member of the grass family. [26] They are the fastest growing woody plants in the world. One Japanese species has been recorded as growing over 1 m (3 ft 3 in) a day. [27] There are over 1,600 species [28] found in diverse climates from cold mountains to hot tropical regions. About 40 million hectares (100 million acres) of the Earth is covered with bamboo, mostly in Asia. [29] The high growth rate of bamboo and the fact that bamboo can grow in diverse climates makes the bamboo plant a sustainable and versatile resource.

The bamboo species used for clothing is called Moso bamboo. Moso bamboo is the most important bamboo in China, where it covers about 3 million hectares (7.4 million acres) – about two percent of China's forest area. It is the main species for bamboo timber and plays an important ecological role. [30]

Harvesting

Once a new shoot emerges from the ground, the new cane will reach its full height in just eight to ten weeks. Each cane reaches maturity in three to five years. It is a grass and so regenerates after being cut just like a lawn without the need for replanting. This regular harvesting actually benefits the health of the plant—studies have shown that felling of canes leads to vigorous re-growth and an increase in the amount of biomass the next year. [31]

Yield and land use

Bamboo can be used as food, fibre and shelter and due to its ease of growth and extraordinary growth rate it is a cheap, sustainable and efficient crop. Bamboo grows very densely, its clumping nature enables a lot of it to be grown in a comparatively small area, easing pressure on land use. With average yields for bamboo of up to 60 tonnes per hectare (27 short tons per acre) [32] greatly exceeding the average yields of 20 tonnes per hectare (9 short tons per acre) for most trees, and 2 tonnes per hectare (1 short ton per acre) for cotton, [33] bamboo's high yield per hectare becomes very significant.[ citation needed ]

Greenhouse gases

All plants fix carbon dioxide CO2 but deforestation results in fewer trees to fix rising levels of CO2. Because it is fast-growing, bamboo fixes more CO2 and generates up to 35 percent more oxygen than similar stands of trees. [34] A bamboo plantation sequesters 62 tonnes per hectare (28 short tons per acre) of carbon dioxide per year, as compared with 15 tonnes per hectare (7 short tons per acre) for a young forest . [35]

Deforestation

Bamboo planting can slow deforestation, providing an alternative source of timber for the construction industry and cellulose fibre for the textile industry. [36] It allows communities to turn away from the destruction of native forests and construct commercial bamboo plantations that can be selectively harvested annually without the destruction of the grove. Tree plantations have to be chopped down and terminated at harvest but bamboo keeps on growing. [37]

Water use

Bamboo uses considerable water, but there is evidence that its water-use efficiency (relative to growth) may be greater than many trees. [38]

Soil erosion

Yearly replanting of tillage crops increases soil erosion. The extensive root system of bamboo and the fact that it is not uprooted during harvesting means bamboo cultivation is associated with less soil erosion. The bamboo plant's root system can hold soil together along river banks, deforested areas and in places prone to mudslides. Like forest trees, it also greatly reduces rain run-off. [39]

Biodegradable

Like other cellulose-based clothing materials, bamboo fibre is biodegradable in soil by micro organisms and sunlight. Having reached the end of its useful life, clothing made from bamboo can be composted and disposed of in an organic and environmentally friendly manner. [40]

Pesticides and fertilizers

There is no need for pesticides or fertilizers when growing bamboo, but herbicide and fertilizer applications are common in some places to encourage edible shoot growth. Bamboo also contains a substance called bamboo-kun–an antimicrobial agent that gives the plant a natural resistance to pest and fungi infestation, though some pathogen problems exist in some bamboo plantations. [41]

Related Research Articles

<span class="mw-page-title-main">Textile</span> Various fiber-based materials

Textile is an umbrella term that includes various fiber-based materials, including fibers, yarns, filaments, threads, different fabric types, etc. At first, the word "textiles" only referred to woven fabrics. However, weaving is not the only manufacturing method, and many other methods were later developed to form textile structures based on their intended use. Knitting and non-woven are other popular types of fabric manufacturing. In the contemporary world, textiles satisfy the material needs for versatile applications, from simple daily clothing to bulletproof jackets, spacesuits, and doctor's gowns.

<span class="mw-page-title-main">Yarn</span> Long continuous length of interlocked fibres

Yarn is a long continuous length of interlocked fibres, used in sewing, crocheting, knitting, weaving, embroidery, ropemaking, and the production of textiles. Thread is a type of yarn intended for sewing by hand or machine. Modern manufactured sewing threads may be finished with wax or other lubricants to withstand the stresses involved in sewing. Embroidery threads are yarns specifically designed for needlework. Yarn can be made of a number of natural or synthetic materials, and comes in a variety of colors and thicknesses. Although yarn may be dyed different colours, most yarns are solid coloured with a uniform hue.

<span class="mw-page-title-main">Fiber</span> Natural or synthetic substance made of long, thin filaments

Fiber or fibre is a natural or artificial substance that is significantly longer than it is wide. Fibers are often used in the manufacture of other materials. The strongest engineering materials often incorporate fibers, for example carbon fiber and ultra-high-molecular-weight polyethylene.

<span class="mw-page-title-main">Cellophane</span> Thin, transparent sheet made of cellulose

Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria, and liquid water makes it useful for food packaging. Cellophane is highly permeable to water vapour, but may be coated with nitrocellulose lacquer to prevent this.

<span class="mw-page-title-main">Rayon</span> Cellulose-based semi-synthetic fiber

Rayon, also called viscose and commercialised in some countries as sabra silk or cactus silk, is a semi-synthetic fiber, made from natural sources of regenerated cellulose, such as wood and related agricultural products. It has the same molecular structure as cellulose. Many types and grades of viscose fibers and films exist. Some imitate the feel and texture of natural fibers such as silk, wool, cotton, and linen. The types that resemble silk are often called artificial silk. It can be woven or knit to make textiles for clothing and other purposes.

<span class="mw-page-title-main">Carbon disulfide</span> Neurotoxic compound with formula S=C=S

Carbon disulfide is an inorganic compound with the chemical formula CS2 and structure S=C=S. It is a colorless, flammable, neurotoxic liquid that is used as a building block in organic synthesis. Pure carbon disulfide has a pleasant, ether- or chloroform-like odor, but commercial samples are usually yellowish and are typically contaminated with foul-smelling impurities.

Synthetic fibers or synthetic fibres are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms, such as plants or fur from animals. They are the result of extensive research by scientists to replicate naturally occurring animal and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. These are called synthetic or artificial fibers. The word polymer comes from a Greek prefix "poly" which means "many" and suffix "mer" which means "single units"..

<span class="mw-page-title-main">Lyocell</span> Regenerated cellulose fiber made from dissolving pulp

Lyocell is a semi-synthetic fiber used to make textiles for clothing and other purposes. It is a form of regenerated cellulose made by dissolving pulp and dry jet-wet spinning. Unlike rayon; which is made by the more common viscose processes, Lyocell production does not use carbon disulfide, which is toxic to workers and the environment. Lyocell was originally trademarked as Tencel in 1982.

<span class="mw-page-title-main">Fiber crop</span> Plant grown for fiber

Fiber crops are field crops grown for their fibers, which are traditionally used to make paper, cloth, or rope.

<span class="mw-page-title-main">Textile manufacturing</span> The industry which produces textiles

Textile manufacturing is a major industry. It is largely based on the conversion of fibre into yarn, then yarn into fabric. These are then dyed or printed, fabricated into cloth which is then converted into useful goods such as clothing, household items, upholstery and various industrial products.

<span class="mw-page-title-main">Cordura</span> Trademark for a group of high-performance fabrics developed by DuPont and now owned by Invista

Cordura is a collection of synthetic fiber-based fabric technologies used in a wide array of products including luggage, backpacks, trousers, military wear and performance apparel.

Courtaulds was a United Kingdom-based manufacturer of fabric, clothing, artificial fibres, and chemicals. It was established in 1794 and became the world's leading man-made fibre production company before being broken up in 1990 into Courtaulds plc and Courtaulds Textiles Ltd.

The manufacture of textiles is one of the oldest of human technologies. To make textiles, the first requirement is a source of fiber from which a yarn can be made, primarily by spinning. The yarn is processed by knitting or weaving, which turns yarn into cloth. The machine used for weaving is the loom. For decoration, the process of colouring yarn or the finished material is dyeing. For more information of the various steps, see textile manufacturing.

Dissolving pulp, also called dissolving cellulose, is bleached wood pulp or cotton linters that has a high cellulose content. It has special properties including a high level of brightness and uniform molecular-weight distribution. This pulp is manufactured for uses that require a high chemical purity, and particularly low hemicellulose content, since the chemically similar hemicellulose can interfere with subsequent processes. Dissolving pulp is so named because it is not made into paper, but dissolved either in a solvent or by derivatization into a homogeneous solution, which makes it completely chemically accessible and removes any remaining fibrous structure. Once dissolved, it can be spun into textile fibers, or chemically reacted to produce derivatized celluloses, such cellulose triacetate, a plastic-like material formed into fibers or films, or cellulose ethers such as methyl cellulose, used as a thickener.

Many materials have been used to make garments throughout history. Grasses, furs and much more complex and exotic materials have been used. Cultures like the Arctic Circle, make their wardrobes out of prepared and decorated furs and skins.[1] Different cultures have added cloth to leather and skins as a way to replace real leather. A wide range of fibers, including natural, cellulose, and synthetic fibers, can be used to weave or knit cloth. From natural fibers like cotton and silk to synthetic ones like polyester and nylon, most certainly reflects culture.

<span class="mw-page-title-main">Cellulose fiber</span> Fibers made with ethers or esters of cellulose

Cellulose fibers are fibers made with ethers or esters of cellulose, which can be obtained from the bark, wood or leaves of plants, or from other plant-based material. In addition to cellulose, the fibers may also contain hemicellulose and lignin, with different percentages of these components altering the mechanical properties of the fibers.

<span class="mw-page-title-main">Cotton recycling</span>

Cotton recycling is the process of converting cotton fabric into fibers that can be reused into other textile products.

Hydroentanglement is a bonding process for wet or dry fibrous webs made by either carding, airlaying or wet-laying, the resulting bonded fabric being a nonwoven. It uses fine, high pressure jets of water which penetrate the web, hit the conveyor belt and bounce back causing the fibres to entangle.

Green textiles are fabrics or fibres produced to replace environmentally harmful textiles and minimise the ecological impact. Green textiles are part of the sustainable fashion and eco-friendly trends, providing alternatives to the otherwise pollution-heavy products of conventional textile industry, which is deemed the most ecologically damaging industry.

Red Scar Works was built in 1939 by Courtaulds and produced rayon. It was located in Ribbleton Preston off Longridge Road. The closure of the works was announced in November 1979 and the issue raised in the UK Parliament House of Commons by the constituency MP. At the time of closure approximately 2,600 people were employed there but there were approximately 4,000 at its peak. It was the largest rayon producing site in Britain. Two main products were manufactured with one being tyre cord by a process known as CSPT – Continuous Spinning Process Tenasco. Two main denier of this product were manufactured. The other product was a general textile called Bright. A range of deniers of this were produced in a range of colours. The trade name for the coloured product was Duracol. At the time of closure, one reason given by management for the closure was the rising popularity of steel belt radial tires thus reducing demand for tyre cord.

References

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