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A bundle of optical fibers

Fiber (also spelled fibre) is a class of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of thread.

They are very important in the biology of both plants and animals, for holding tissues together.

Human uses for fibers are diverse. They can be spun into filaments, string, or rope, used as a component of composite materials, or matted into sheets to make products such as paper or felt. Fibers are often used in the manufacture of other materials. The strongest engineering materials are generally made as fibers, for example carbon fiber and Ultra-high-molecular-weight polyethylene.

Synthetic fibers can often be produced very cheaply and in large amounts compared to natural fibers, but for clothing natural fibers can give some benefits, such as comfort, over their synthetic counterparts.

Textile fiber[link]

A unit in which many complicated textile structures are built up is said to be textile fiber.

Natural fibers[link]

Natural fibers include those produced by plants, animals, and geological processes. They are biodegradable over time. They can be classified according to their origin:

• Vegetable fibers are generally based on arrangements of cellulose, often with lignin: examples include cotton, hemp, jute, flax, ramie, sisal and bagasse. Plant fibers are employed in the manufacture of paper and textile (cloth), and dietary fiber is an important component of human nutrition.
• Wood fiber, distinguished from vegetable fiber, is from tree sources. Forms include groundwood, thermomechanical pulp (TMP) and bleached or unbleached kraft or sulfite pulps. Kraft and sulfite, also called sulphite, refer to the type of pulping process used to remove the lignin bonding the original wood structure, thus freeing the fibers for use in paper and engineered wood products such as fiberboard.
• Animal fibers consist largely of particular proteins. Instances are silkworm silk, spider silk, sinew, catgut, wool, sea silk and hair such as cashmere, mohair and angora, fur such as sheepskin, rabbit, mink, fox, beaver, etc.
• Mineral fibers include the asbestos group. Asbestos is the only naturally occurring long mineral fiber. Six minerals have been classified as "asbestos" including chrysotile of the serpentine class and those belonging to the amphibole class: amosite, crocidolite, tremolite, anthophyllite and actinolite. Short, fiber-like minerals include wollastonite and attapulgite.

Synthetic fibers[link]

Synthetic generally come from synthetic materials such as petrochemicals, but some types of synthetic fibers are manufactured from natural cellulose, including rayon, modal, and Lyocell. Cellulose-based fibers are of two types, regenerated or pure cellulose such as from the cupro-ammonium process and modified cellulose such as the cellulose acetates.^[1]

Fiber classification in reinforced plastics falls into two classes: (i) short fibers, also known as discontinuous fibers, with a general aspect ratio (defined as the ratio of fiber length to diameter) between 20 to 60, and (ii) long fibers, also known as continuous fibers, the general aspect ratio is between 200 to 500.^[2]

Cellulose fibers[link]

• Cellulose fibers are a subset of man-made fibers, regenerated from natural cellulose. The cellulose comes from various sources. Modal is made from beech trees, bamboo fiber is a cellulose fiber made from bamboo, seacell is made from seaweed, etc.

Mineral fibers[link]

Mineral fibers can be particularly strong because they are formed with a low number of surface defects.^[3]

• Fiberglass, made from specific glass, and optical fiber, made from purified natural quartz, are also man-made fibers that come from natural raw materials, silica fiber, made from sodium silicate (water glass) and basalt fiber made from melted basalt.
• Metallic fibers can be drawn from ductile metals such as copper, gold or silver and extruded or deposited from more brittle ones, such as nickel, aluminum or iron.
• Carbon fibers are often based on oxydized and via pyrolysis carbonized polymers like PAN, but the end product is almost pure carbon.
• Silicon carbide fibers, where the basic polymers are not hydrocarbons but polymers, where about 50% of the carbon atoms are replaced by silicon atoms, so-called poly-carbo-silanes. The pyrolysis yields an amorphous silicon carbide, including mostly other elements like oxygen, titanium, or aluminium, but with mechanical properties very similar to those of carbon fibers.
• Stainless steel fibers.

Polymer fibers[link]

• Polymer fibers are a subset of man-made fibers, which are based on synthetic chemicals (often from petrochemical sources) rather than arising from natural materials by a purely physical process. These fibers are made from:
  • polyamide nylon
  • PET or PBT polyester
  • phenol-formaldehyde (PF)
  • polyvinyl alcohol fiber (PVA) vinylon
  • polyvinyl chloride fiber (PVC) vinyon
  • polyolefins (PP and PE) olefin fiber
  • acrylic polyesters, pure polyester PAN fibers are used to make carbon fiber by roasting them in a low oxygen environment. Traditional acrylic fiber is used more often as a synthetic replacement for wool. Carbon fibers and PF fibers are noted as two resin-based fibers that are not thermoplastic, most others can be melted.
  • aromatic polyamids (aramids) such as Twaron, Kevlar and Nomex thermally degrade at high temperatures and do not melt. These fibers have strong bonding between polymer chains
  • polyethylene (PE), eventually with extremely long chains / HMPE (e.g. Dyneema or Spectra).
  • Elastomers can even be used, e.g. spandex although urethane fibers are starting to replace spandex technology.
  • polyurethane fiber

• Coextruded fibers have two distinct polymers forming the fiber, usually as a core-sheath or side-by-side. Coated fibers exist such as nickel-coated to provide static elimination, silver-coated to provide anti-bacterial properties and aluminum-coated to provide RF deflection for radar chaff. Radar chaff is actually a spool of continuous glass tow that has been aluminum coated. An aircraft-mounted high speed cutter chops it up as it spews from a moving aircraft to confuse radar signals.

Microfibers[link]

Microfibers in textiles refer to sub-denier fiber (such as polyester drawn to 0.5 dn). Denier and Detex are two measurements of fiber yield based on weight and length. If the fiber density is known you also have a fiber diameter, otherwise it is simpler to measure diameters in micrometers. Microfibers in technical fibers refer to ultra fine fibers (glass or meltblown thermoplastics) often used in filtration. Newer fiber designs include extruding fiber that splits into multiple finer fibers. Most synthetic fibers are round in cross-section, but special designs can be hollow, oval, star-shaped or trilobal. The latter design provides more optically reflective properties. Synthetic textile fibers are often crimped to provide bulk in a woven, non woven or knitted structure. Fiber surfaces can also be dull or bright. Dull surfaces reflect more light while bright tends to transmit light and make the fiber more transparent.

Very short and/or irregular fibers have been called fibrils. Natural cellulose, such as cotton or bleached kraft, show smaller fibrils jutting out and away from the main fiber structure.^[1]

See also[link]

Wikimedia Commons has media related to: Fibers

• Optical fiber
• Fiber crop
• Molded pulp
• Dietary fiber
• Fibers in Differential Geometry
• Ceramic matrix composite

References[link]

v t e Textile arts Fundamentals Applique Beadwork Crochet Dyeing Embroidery Fabric (textiles) Felting Fiber Knitting Lace Macramé Nålebinding Needlework Patchwork Passementerie Plying Quilting Rope Rug making Sewing Stitch Spinning Spinning by hand Sprang Tapestry Tatting Textile printing Weaving Yarn History of ... Byzantine silk Clothing and textiles Silk Quilting Silk in the Indian subcontinent Textile manufacturing by pre-industrial methods Textiles in the Industrial Revolution Modern Industrial Textile Production Timeline of textile technology Regional and ethnic African Andean Australian Aboriginal Hmong Indigenous peoples of the Americas Korean Māori Mayan Mexican Navajo Oaxacan Related Blocking Fiber art Mathematics and fiber arts Manufacturing Preservation Recycling Textile industry Textile Museums Units of measurement Wearable fiber art Reference Dyeing terms Sewing terms Textile terms

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Brenda Watson (born May 15, 1953) is a natural health practitioner specializing in digestive care, nutrition, and internal cleansing and detoxification. Brenda became interested in holistic medicine when she faced her own struggle with poor health early in life. She has since dedicated her career to helping people improve their well being through natural remedies. Brenda is also the president and co-founder of Tampa Bay, Florida-based ReNew Life Formulas, Inc., which develops and manufactures herbal supplements. A New York Times best-selling author,^[1] she has earned recognition with her PBS specials and television appearances.

Biography[link]

Brenda Watson, C.N.C. has been a natural health practitioner for more than 20 years. Inspired by the holistic healing principles that helped her overcome her own battle with prolonged illness, she began her career in alternative medicine in 1993 with the establishment of five natural health clinics in the state of Florida specializing in herbal internal cleansing and detoxification. Through her clinical work, Brenda discovered the natural remedies that helped her patients improve their health and soon after began formulating her own herbal blends.

In 1997 Brenda and her husband Stan Watson founded ReNew Life Formulas, Inc. The Tampa Bay, Florida-based company manufactures and distributes natural digestive care products and functional foods. ReNew Life reaches more than 3 million people annually through a commitment to retailer and consumer education and maintains a facility in Boulder, Colorado and a Canadian division located in Ontario.

Career[link]

• 1993: Brenda became a licensed Colon Therapist and established five natural health clinics in the state of Florida. Treatment focused primarily on herbal internal cleansing and detoxification, as well as colon hydrotherapy, nutritional counseling, massage therapy and acupuncture.

• 1995-2005: Brenda served as president for the International Association for Colon Hydrotherapy (I-ACT), during which time she helped develop the I-ACT Ambassador Program for therapists and instructors.

• 1996-2006: During this time Brenda developed the ReNew Life School of Natural Therapies Anatomy/Physiology curriculum for Colon Therapy Licensure, as well as the curriculum for Colon Therapy Apprenticeship Programs in the state of Florida.

• 1997: Together with her husband Stan, Brenda founded ReNew Life Formulas, Inc., as well as its sister company, Advanced Naturals. Advanced Naturals develops natural digestive care formulas for natural health practitioners, colon therapists and medical doctors.

• 2003 to Present: Brenda continued her education, earning her credentials as both a Doctor of Naturopathy (N.D.) and a Certified Nutritional Consultant (C.N.C.). Brenda serves currently as the President of ReNew Life Formulas and Advanced Naturals.

Marriage and children[link]

Brenda has two grown children and lives in Florida with her husband Stan and their dogs.

Published works[link]

Books[link]

• Renew Your Life: Improved Digestion and Detoxification (2002)
• Gut Solutions: Natural Solutions to Your Digestive Problems (2003)
• Essential Cleansing for Perfect Health (2006)
• Gut Prescriptions (2006)
• The H.O.P.E. Formula: The Ultimate Health Secret (2006)
• The Fiber35 Diet: Nature’s Weight Loss Secret (2007)
• Total Body Internal Cleansing (2008)
• The Detox Strategy: Vibrant Health in 5 Easy Steps (2008)

Television[link]

• Brenda Watson’s H.O.P.E. Formula on PBS
• Brenda Watson’s Fiber35 Diet on PBS
• Brenda Watson’s Detox Strategy on PBS

References[link]