Glossary



ABNORMAL CRIMP
A relative term for crimp that is either too low or too high in frequency and/or amplitude or that has been put into the fiber with improper angular characteristics.

ABRADED YARN
A filament yarn in which filaments have been cut or broken to create hairiness (fibrillation) to simulate the surface character of spun yarns. Abraded yarns are usually plied or twisted with other yarns before use.

ABRASION MARK
An area where a fabric has been damaged by friction.
Also see: CHAFE MARK BRUISE RUB

ABRASION RESISTANCE
The ability of a fiber or fabric to withstand surface wear and rubbing.

ABSORBANCE
The ability of a substance to transform radiant energy into a different form, usually with a resulting rise in temperature. Mathematically, absorbance is the negative logarithm to the base 10 of transmittance.

ABSORBENCY
The ability of fabric to take in moisture. Very important in relation to skin comfort, but other factors important too, effect on static build up, staining and removal, water repellency, shrinkage and wrinkling.

ABSORPTION
The process of gases or liquids being taken up into the pores of a fiber, yarn, or fabric. See ADSORPTION.)

ACCELERANT
A chemical used to speed up chemical or other processes. For example, accelerants are used in dyeing triacetate and polyester fabrics.

ACETATE FIBER
A manufactured fiber in which the fiber-forming substance is cellulose acetate (FTC definition). Acetate is manufactured by treating purified cellulose refined from cotton linters and/or wood pulp with acetic anhydride in the presence of a catalyst. The resultant product, cellulose acetate flake, is precipitated, purified, dried, and dissolved in acetone to prepare the spinning solution. After filtration, the highly viscous solution is extruded through spinnerets into a column of warm air in which the acetone is evaporated, leaving solid continuous filaments of cellulose acetate. The evaporated acetone is recovered using a solvent recovery system to prepare additional spinning solution. The cellulose acetate fibers are intermingled and wound onto a bobbin or shippable metier cheese package, ready for use without further chemical processing. In the manufacture of staple fiber, the filaments from numerous spinnerets are combined into tow form, crimped, cut to the required length, and packaged in bales.
Also see: CELLULOSE ACETATE TRIACETATE FIBER

ACETIC ACID
An organic acid (CH3COOH) widely used in textile applications. It is used in textile wet processing, dyeing and printing, and in the manufacture of cellulose acetate and cellulose triacetate.

ACETIC ANHYDRIDE
Anhydrous acetic acid [(CH3CO)2O]. It is used in the acetylation process in the manufacture of cellulose acetate.

ACETONE
Dimethyl ketone (CH3COCH3). One of the most powerful organic solvents. Acetone dissolves secondary cellulose acetate and other derivatives of cellulose. It is miscible with water and has a low boiling point (55-56°C).

ACETONE RECOVERY
A process for reclaiming the acetone solvent from acetate fiber or plastics manufacture. Usually the recovery process consists of adsorption by activated carbon and re-distillation.

ACETYL
The radical (CH3CO-) of acetic acid.

ACETYL VALUE
A measure of the degree of esterification or combination of acetyl radicals with cellulose in acetate or triacetate products.

ACETYLATION
A chemical reaction whereby the acetyl radical is introduced into a compound, as in the conversion of cellulose to cellulose acetate.

ACID DYES
A class of dyes used on wool, other animal fibers, and some manufactured fibers.Acid dyes are seldom used on cotton or linen since this process requires a mordant. Acid dyes are widely used on nylon when high wash fastness is required. In some cases, even higher wash fastness can be obtained by after treatment with fixatives.
Also see: DYES

ACID FADING
See GAS FADING.

ACID RECOVERY
A reclamation process in chemical processing in which acid is extracted from a raw material, by-product, or waste product. In the manufacture of cellulose acetate, acetic acid is a major by-product. Acid recovery consists of combining all wash water containing appreciable acetic acid and concentrating it to obtain glacial acetic acid.

ACID RESISTANCE
The property of withstanding contact or treatment with any acids normally encountered in use. The type of acid should be stated (i.e., organic or inorganic).

ACID-DYEABLE VARIANTS
Polymers modified chemically to make them receptive to acid dyes.

ACIDIC
A term describing a material having a pH of less than 7.0 in water.

ACRYLIC FIBER
A manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 85% by weight of acrylonitrile units [-CH2-CH(CN)-] (FTC definition). Acrylic fibers are produced by two basic methods of spinning (extrusion), dry and wet. In the dry spinning method, material to be spun is dissolved is a solvent. After extrusion through the spinneret, the solvent is evaporated, producing continuous filaments which later may be cut into staple, if desired. In wet spinning, the spinning solution is extruded into a liquid coagulating bath to form filaments, which are drawn, dried, and processed.

ACRYLIC RESIN
A polymer of acrylonitrile, used in the production of manufactured fibers, as a fabric finish and as a size.

ACRYLONITRILE
A colorless, volatile, flammable liquid (CH2=CHCN) used as a raw material in the manufacture of acrylic polymers and fibers.

ACTINIC DEGRADATION
See ULTRAVIOLET DEGRADATION.

ACTINIC RESISTANCE
See ULTRAVIOLET RESISTANCE.

ACTION STRETCH
A term applied to fabrics and garments that give and recover in both the lengthwise and the widthwise directions. Action stretch is ideal for tight-fitting garments such as ski pants.

ACTIVATED CARBON
Charcoal, mostly of vegetable origin, of high adsorptive capacity. It is used for decolorizing liquids and other adsorption purifications. Usually made by carbonization and chemical activation.

ADDITION POLYMERIZATION
A reaction yielding a polymer in which the molecular formula of the repeating unit is identical with that of the monomer. The molecular weight of a polymer so formed is a simple sum of the molecular weight of the combined monomer units. Combination occurs by means of rearrangement of the chemical bonds.
Also see: POLYMERIZATION

ADDITIVE
A supplementary material combined with a base material to provide special properties. For example, pigments are used as dope additives to give color in mass dyeing.

ADHESION
The force that holds different materials together at their interface and resists separation into two layers.

ADHESION PROMOTERS
Products used to treat the smooth fiber-face of closely constructed base fabric to provide a chemical bonding site for subsequent coating. This step is done because it is difficult to get good coating adhesion via strike-through and mechanical bonding in closely constructed fabrics. Products containing the isocyanate group are the most widely used promoters. See DIP TREATING.

ADHESIVE ACTIVATED YARNS
Yarns treated by the fiber manufacturer to promote better adhesion to another material such as rubber and/or to allow easier processing.

ADHESIVE MIGRATION
In nonwovens, the movement of adhesive together with its carrier solvent in a fabric during drying, giving it a non-uniform distribution within the web, usually increasing to the outer layers.

ADHESIVES
In textiles, materials which cause fibers, yarns, or fabrics to stick together or to other materials.

ADIPIC ACID
1,4-butanedicarboxylic acid [COOH(CH2)4COOH]. It is used in the polymerization reaction to form nylon 66 polymers and in the manufacture of polyurethane foams.

ADSORPTION
The attraction of gases, liquids, or solids to surface areas of textile fibers, yarns, fabrics, or any material. See ABSORPTION.

ADVANCED COMPOSITE
Polymer, resin, or other matrix-material system in which reinforcement is accomplished via high-strength, high-modulus materials in continuous filament form or is discontinuous form such as staple fibers, fibrets, and in-situ dispersions. See COMPOSITE.

AESTHETICS
In textiles, properties perceived by touch and sight, such as the hand, color, luster, drape, and texture of fabrics or garments.
Also see: ESTHETICS

AFFINITY
Chemical attraction; the tendency of two elements or substances to unite or combine, such as fiber and dyestuff.

AFTERGLOW
The flameless, glowing combustion of certain solid materials that occurs after the removal of an external source of ignition or after the cessation of combustion of the material.

AFTERTREATMENT
Any treatment done after fabric production. In dyeing, it refers to treating dyed material in ways to improve properties; in nonwovens, it refers to finishing processes carried out after a web has been formed and bonded. Examples are embossing, creping, softening, printing, and dyeing.

AGEING
1. Deterioration of textile or other materials caused by gradual oxidation during storage and/or exposure to light. 2. The oxidation stage of alkali-cellulose in the manufacture of viscose rayon from bleached wood pulp. 3. Originally, a process in which printed fabric was exposed to a hot, moist atmosphere. Presently, the term is applied to the treatment of printed fabric in moist steam in the absence of air. Ageing is also used for the development of certain colors in dyeing, e.g., aniline black.

AGER
A steam chamber used for ageing printed or padded material.

AGGLOMERATION
A cluster of particles or fibers.

AGITATE
To stir or to mix, as in the case of a dyebath or solution.

AIR BAG
An automatically inflating bag in front of riders in an automobile to protect them from pitching forward in an accident. End use for manufactured textile fibers.

AIR BRUSHING
Blowing color on a fabric or paper with a mechanized pneumatic brush.

AIR CONDITIONING
1. A chemical process for sealing short, fuzzy fibers into a yarn. Fabrics made from air-conditioned yarns are porous. Because they allow more air circulation, these fabrics are also cooler. 2. Control of temperature and/or humidity in work or living space.

AIR ENTANGLED YARNS
See COMPACTED YARNS.

AIR FORMING
A process in which air is used to separate and move fibers to fashion a web such as the Kroyer process for short fibers, usually of wood pulp; or the Rando-Webber process for staple-length fibers.

AIR JET METHOD
In this method of texturing, yarn is led through the turbulent region of an air jet at a rate faster than it is drawn off on the far side of the jet. In the jet, the yarn structure is opened, loops are formed, and the structure is closed again. Some loops are locked inside and others are locked on the surface of the yarn. An example of this method is the Taslan process. (Also see TEXTURED YARNS, CORE-BULKED YARN and ENTANGLED YARN.)
Also see: TASLIN PROCESS JET

AIR JET SPINNING
A spinning system in which yarn is made by wrapping fibers around a core stream of fibers with compressed air. In this process, the fibers are drafted to appropriate sliver size, then fed to the air jet chambers where they are twisted, first in one direction, then in the reverse direction in a second chamber. They are stabilized after each twisting operation.
Also see: MURATA SPINNING

AIR JET TEXTURING
See TEXTURING.

AIR PERMEABILITY
The porosity or the ease with which air passes through material. Air permeability determines such factors as the wind resistance of sailcloth, the air resistance of parachute cloth, and the efficacy of various types of air filters. It also influences the warmth or coolness of a fabric.

AIR-LAID NONWOVENS
Fabrics made by an air-forming process (q.v.). The fibers are distributed by air currents to give a random orientation within the web and a fabric with isotropic properties.

AIRPLANE FABRIC
A plain, tightly woven, water-repellent fabric traditionally made of mercerized cotton. During World War I, the fabric was treated with a cellulose acetate dope and used to cover the wings, tail, and fuselage of airplanes. Today, similar fabrics made from nylon or polyester/cotton blends are used in rainwear and sportswear.

AIR-SUPPORTED ROOF
A fabric-based roofing system that is supported and held in place by air pressure.

ALBATROSS
A soft, lightweight wool or wool blend fabric in a plain weave with a napped, fleecy surface that resembles in texture, the breast of the albatross. It is usually light-colored and is used in negligees, infants wear, etc.

ALGINATE FIBER
Fiber formed from a metallic salt (normally calcium) of alginic acid, which is a natural polymer occurring in seaweed. Alginate fiber is soluble in water.

ALKALINE
A term used to describe a material having a pH greater than 7.0 in water.

ALKYLATION
The introduction of an alkyl radical into an organic molecule.

ALLOY
A solid or liquid mixture of two or more metals; or of one or more metals with certain nonmetallic elements formed by fusing the components.

ALPACA
1. Long, fine hair from Alpaca sheep. 2. A fabric from alpaca fibers or blends, (originally a cotton cloth with alpaca filling) that is used for dresses, coats, suits, and sweaters. It is also used as a pile lining for jackets and coats. (The term has been incorrectly used to describe a rayon fabric.)

ALPACA STITCH
A 1 x 1 purl-links stitch that is knit so that the courses run vertically instead of horizontally as the fabric comes off the knitting machine. A garment made with an alpaca stitch is not always 100% alpaca; it can be made of other natural or manufactured fibers.

ALPHA CELLULOSE
One of three forms of cellulose. Alpha cellulose has the highest degree of polymerization and is the chief constituent of paper pulp and chemical dissolving-grade pulp. See BETA CELLULOSE and GAMMA CELLULOSE.

ALSIMAG
Registered trademark of American Lava Corporation for ceramic materials. These materials are used in guides and discs on textile processing machines and fiber manufacturing equipment.

ALTERNATING TWIST
A texturing procedure in which S and Z twist are alternately inserted in the yarn by means of a special heating arrangement.

AMBIENT CONDITIONS
See ATMOSPHERIC CONDITIONS.

AMINE END GROUP
The terminating (-NH2) group of a nylon polymer chain. Amine end groups provide dye sites for polyamides.

AMORPHOUS
Noncrystalline, lacking regular geometrical shape. Used to describe certain regions in polymers.

ANGORA
1. The hair of the Angora goat. The long, fine fibers are so smooth and soft that they must be combined with other fibers in weaving. 2. The hair of the Angora rabbit. The fine, lightweight hair is warm, and it is often blended with wool to decrease price and to obtain novelty effects in weaving. By law, the fiber must be described as Angora rabbit hair.
Also see: MOHAIR

ANHYDRIDE
A compound formed by abstraction of water, usually from an acid.

ANIDEX FIBER
A manufactured fiber in which the fiber-forming substance is any long chain synthetic polymer composed of at least 50% by weight of one or more esters of a monohydric alcohol and acrylic acid, (CH2=CH-COOH) (FTC definition).

ANILINE DYES
Dyes derived chemically from aniline or other coal tar derivatives.
Also see: DYES

ANIMAL FIBERS
Fibers of animal origin such as wool, alpaca, camel hair, and silk.

ANION
A negatively charged ion.

ANISOTROPIC
Not having the same physical properties in every direction. In the plane of a fabric, it is related to a non-random distribution of fibers.

ANTHRAQUINONE DYES
Dyes that have anthraquinone as their base and the carbonyl group(>C=O) as the chromophore. Anthraquinone-based dyes are found in most of the synthetic dye classes.
Also see: DYES

ANTIBACTERIAL FINISH
A treatment of a textile material to make it resistant to, or to retard growth of, bacteria.

ANTICHLOR
A chemical, such as sodium thiosulfate, used to remove excess chlorine after bleaching.

ANTIFELTING AGENTS
Products that prevent or minimize matting and compaction of textile materials.

ANTI-FOAMING AGENT
An additive that minimizes the formation of bubbles within or on the surface of a liquid by reducing the forces that support the bubbles structure.

ANTIOXIDANT
A substance to retard deterioration (of fiber, fabrics, finishes, etc.) resulting from reaction with oxygen.

ANTISOILING PROPERTIES
The properties of textile materials whereby they resist deposition of dirt and stains.

ANTISTAINING PROPERTIES
The ability of a textile to resist the deposition of oil- or water-borne stains

ANTISTATIC AGENT
A reagent capable of preventing, reducing, or dissipating static electrical charges that may be produced on textile materials.

ANTISTATIC PROPERTIES
The ability of a textile material to disperse an electrostatic charge and to prevent the build up of static electricity.

APPLIQUE
A design made separately and then sewn on a cloth or garment.

APRON MARK
See DECATING MARK.

ARACHNE MACHINE
A machine for producing loop-bonded non-wovens. The fabric is formed by knitting a series of warp yarns through a fiber web processed on a card. (Also see BONDING, STITCH BONDING.)

ARAMID FIBER
A manufactured fiber in which the fiber-forming material is a long chain synthetic polyamide having at least 85% of its amide linkages (-NH-CO-) attached directly to two aromatic rings (FTC definition). Aramid fibers exhibit low flammability, high strength, and high modulus. Fabrics made from aramid fibers maintain their integrity at high temperatures, such fabrics are used extensively in hot-air filters. Aramids are also found in protective clothing, ropes and cables, and tire cord.

ARGYLE
A pattern consisting of diamond shapes of different colors knit in a fabric.

ART LINEN
A plain-weave, softly finished fabric used either bleached or unbleached as a base fabric for needlework.

ARTIFICIAL TURF
A manufactured carpet having the appearance of grass. Used to replace grass in sports arenas, yards, etc. (Also see RECREATIONAL SURFACES.)

ASBESTOS
A nonmetallic mineral fiber, which is nonflammable. The fiber is woven into fabrics and used for theater curtains and industrial uses where flame-resistant materials are needed.

ASPECT RATIO
1. The ratio of length to diameter of a fiber or yarn bundle. 2. In tire production, the ratio of the height of the tire to its width. 3. In a rectangular structure, the ratio of the longer dimension to the shorter.

ASPHALT OVERLAY FABRICS
See GEOTEXTILES.

ASTRAKHAN CLOTH
A thick knit or woven fabric with loops or curls on the face. The base yarns are usually cotton or wool and the loops are made with fibers such as mohair, wool, and certain manufactured fibers. The face simulated the pelt of the astrakhan lamb.

ATACTIC POLYMER
A type of polymer molecule in which substituent groups or atoms are arranged randomly above and below the backbone chain of atoms, when the latter are all in the same plane (e.g., in polypropylene). (Also see ISOTACTIC POLYMER, SYNDIOTACTIC POLYMER, and TACTIC POLYMER.)

ATMOSPHERIC CONDITIONS
In general, the relative humidity, barometric pressure, and temperature existing at a given time.
Also see: AMBIENT CONDITIONS

ATMOSPHERIC FADING
See GAS FADING.

ATTRITION MILLS
Machines for reducing materials into smaller particles by grinding down by friction. In the manufacture of acetate and triacetate fibers, equipment used in shredding pulp prior to acetylation.

AUTOCLAVE
1. An apparatus for carrying out certain finishing operation, such as pleating and heat setting, under pressure in a superheated steam atmosphere. 2. Apparatus for polymerizing condensation polymers such as nylon or polyester at any pressure above or below atmospheric.

AVERAGE STIFFNESS
The ratio of change in stress to change in strain between two points on a stress-strain diagram, particularly the points of zero stress and breaking stress. (Also see MODULUS).

AVERAGE TOUGHNESS
See TOUGHNESS.

AXIAL YARN
A system of longitudinal yarns in a triaxial braid that are inserted between bias yarns.
Also see: LAID-IN YARN

AXMINSTER CARPET
A machine-woven carpet in which successive weft-wise rows of pile are inserted during weaving according to a predetermined arrangement of colors. There are four main types of Axminster looms

AZLON FIBER
A manufactured fiber in which the fiber-forming substance consists of any regenerated naturally occurring proteins (FTC definition). Azlon is not currently produced in the United States.

AZO DYES
Dyes characterized by the presence of an azo group (-N=N-) as the chromophore. Azo dyes are found in many of the synthetic dye classes. Potentially carcinogenic banned dyestuffs.
Also see: DYES

AZOIC DYES
See DYES, NAPHTHOL DYES.