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Textile Textile is an Hyponymy and hypernymy, umbrella term that includes various Fiber, fiber-based materials, including fibers, yarns, Staple (textiles)#Filament fiber, filaments, Thread (yarn), threads, different #Fabric, fabric types, etc. At f ...
fiber Fiber or fibre (from la, fibra, links=no) 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 ...
s, threads,
yarn 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 manu ...
s and
fabric 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 ...
s are measured in a multiplicity of units. * A
fiber Fiber or fibre (from la, fibra, links=no) 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 ...
, a single filament of natural material, such as
cotton Cotton is a soft, fluffy staple fiber that grows in a boll, or protective case, around the seeds of the cotton plants of the genus '' Gossypium'' in the mallow family Malvaceae. The fiber is almost pure cellulose, and can contain minor pe ...
,
linen Linen () is a textile made from the fibers of the flax plant. Linen is very strong, absorbent, and dries faster than cotton. Because of these properties, linen is comfortable to wear in hot weather and is valued for use in garments. It also ...
or
wool Wool is the textile fibre obtained from sheep and other mammals, especially goats, rabbits, and camelids. The term may also refer to inorganic materials, such as mineral wool and glass wool, that have properties similar to animal wool. ...
, or artificial material such as
nylon Nylon is a generic designation for a family of synthetic polymers composed of polyamides ( repeating units linked by amide links).The polyamides may be aliphatic or semi-aromatic. Nylon is a silk-like thermoplastic, generally made from pet ...
,
polyester Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include natura ...
,
metal A metal (from ancient Greek, Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, e ...
or
mineral fiber Fiber or fibre (from la, fibra, links=no) 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 ...
, or man-made cellulosic fibre like viscose, Modal,
Lyocell Lyocell, originally trademarked in 1982 as Tencel, is a form of regenerated cellulose. It consists of cellulose fibers, made by dissolving pulp and then reconstituting it by dry jet-wet spinning. The fiber is used to make textiles for clothing a ...
or other
rayon Rayon 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. It is also called viscose. Many types and grades of viscose ...
fiber is measured in terms of linear mass density, the weight of a given length of fiber. Various units are used to refer to the measurement of a fiber, such as: the denier and tex (linear mass density of fibers), super S (fineness of wool fiber),
worsted Worsted ( or ) is a high-quality type of wool yarn, the fabric made from this yarn, and a yarn weight category. The name derives from Worstead, a village in the English county of Norfolk. That village, together with North Walsham and Aylsham ...
count, woolen count, linen count (wet spun) (or Number English (Ne)), cotton count (or Number English (Ne)), Number metric (Nm) and yield (the reciprocal of denier and tex). * A
yarn 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 manu ...
, a spun
agglomeration Agglomeration may refer to: * Urban agglomeration, in standard English * Megalopolis, in Chinese English, as defined in China's ''Standard for basic terminology of urban planning'' (GB/T 50280—98). Also known as " city cluster". * Economies of ag ...
of fibers used for
knitting Knitting is a method by which yarn is manipulated to create a textile, or fabric. It is used to create many types of garments. Knitting may be done by hand or by machine. Knitting creates stitches: loops of yarn in a row, either flat or i ...
,
weaving Weaving is a method of textile production in which two distinct sets of yarns or threads are interlaced at right angles to form a fabric or cloth. Other methods are knitting, crocheting, felting, and braiding or plaiting. The longitudinal ...
or
sewing Sewing is the craft of fastening or attaching objects using stitches made with a sewing needle and thread. Sewing is one of the oldest of the textile arts, arising in the Paleolithic era. Before the invention of spinning yarn or weaving ...
, is measured in terms of cotton count and yarn density. * Thread, usually consisting of multiple yarns plied together producing a long, thin strand used in sewing or weaving, is measured in the same units as yarn. *
Fabric 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 ...
, material typically produced by weaving, knitting or knotting textile fibers, yarns or threads, is measured in units such as the momme, thread count (a measure of the coarseness or fineness of fabric), ends per inch (e.p.i) and picks per inch (p.p.i).


Fibers


Micronaire

Micronaire is a measure of the air permeability of cotton fiber and is an indication of fineness and maturity. Micronaire affects various aspects of cotton processing.


Micron

One millionth of a
metre The metre ( British spelling) or meter ( American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its pre ...
, or one thousandth of a millimetre; about one-fourth the width of a strand of spider silk. Cotton Bale Size Cotton lint is usually measured in bales, although there is no standard and the bale size may vary country to country. For example in the United States it measures approximately 0.48 cubic metres (17 cubic feet) and weighs 226.8 kilograms (500 pounds). In India, a bale equals 170 kilograms.


S or super S number

Not a true unit of measure, S or super S number is an index of the fineness of wool fiber and is most commonly seen as a label on wool apparel, fabric, and yarn.


Slivers, tops and rovings

Slivers, tops and rovings are terms used in the worsted process. The sliver come off the card, tops come after the comb, rovings come before a yarn, and all have a heavier linear density.


Grams per metre

If the metric system is in use the linear density of slivers and tops is given in grams per metre. Tops destined for machine processing are typically 20 grams per metre. Hobby spinners typical use a little heavier top.


Yield

Similar to tex and denier, yield is a term that helps describe the linear density of a roving of fibers. However, unlike tex and denier, yield is the inverse of linear density and is usually expressed in yards per pound (yd/lb).


Yarn and thread


Twist


Twists per inch

Number of twists per inch.


Twists per metre

Number of twists per metre.


Linear density

There are two systems used for presenting linear density, direct and indirect. When the direct method is used, the length is fixed and the weight of yarn is measured; for example, tex gives the weight in grams of one thousand metres of yarn. An indirect method fixes the weight and gives the length of yarn created.


Units

The textile industry has a long history and there are various units in use. Tex is more likely to be used in Canada and
Continental Europe Continental Europe or mainland Europe is the contiguous continent of Europe, excluding its surrounding islands. It can also be referred to ambiguously as the European continent, – which can conversely mean the whole of Europe – and, by ...
, while denier remains more common in the United States. *tex: Grams per 1,000 metres of yarn. Tex is a direct measure of linear density. *den (denier): Grams per 9,000 metres of yarn. Den is a direct measure of linear density. *dtex (deci-tex): Grams per 10,000 metres of yarn. Dtex is a direct measure of linear density. *gr/yard: Grains per yard of yarn. Gr/yard is a direct measure of linear density, but is rarely used in the modern textile industry. *ECC or NeC or Ne (English Cotton Count): The number of 840 yd lengths per pound. ECC is an indirect measure of linear density. It is the number of hanks of skein material that weighs 1 lb. Under this system, the higher the number, the finer the yarn. In the United States cotton counts between 1 and 20 are referred to as coarse counts. *NeK or NeW (Worsted Count): The number of 560 yd lengths per 1 lb of yarn. NeK is an indirect measure of linear density. NeK is also referred to as the spinning count. *NeL or Lea (Linen Count): The number of 300 yd lengths per 1 lb of yarn. NeL is an indirect measure of linear density. *NeS (Woollen Count or Yorkshire Skeins Woollen): The number of 256 yd lengths per 1 lb of yarn. NeS is an indirect measure of linear density. One of the best known of the many different woolen yarn counts.


Conversion table

The following table summarizes several measures of linear density and gives equivalences.


Denier

Denier () or den (abbreviated D), a unit of measure for the linear mass density of
fibers Fiber or fibre (from la, fibra, links=no) 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 ...
, is the
mass Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different ele ...
in
gram The gram (originally gramme; SI unit symbol g) is a unit of mass in the International System of Units (SI) equal to one one thousandth of a kilogram. Originally defined as of 1795 as "the absolute weight of a volume of pure water equal to th ...
s per 9000
metres The metre (British spelling Despite the various English dialects spoken from country to country and within different regions of the same country, there are only slight regional variations in English orthography, the two most notable va ...
of the fiber. The denier is based on a natural reference: a single strand of silk is approximately one denier; a 9000-metre strand of silk weighs about one gram. The term ''denier'' comes from the
French denier The denier ( la, denarius; . d.) or penny was a medieval coin which takes its name from the Frankish coin first issued in the late seventh century; in English it is sometimes referred to as a silver penny. Its appearance represents the end ...
, a coin of small value (worth '' sou''). Applied to
yarn 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 manu ...
, a denier was held to be equal in weight to . There is a difference between ''filament'' and ''total'' measurements in deniers. Both are defined as above, but the first relates to a single filament of fiber (commonly called ''denier per filament'' (''DPF'')), whereas the second relates to a yarn. Broader terms, such as ''fine'' may be applied, either because the overall yarn is fine or because fibers within this yarn are thin. A 75-denier yarn is considered fine even if it contains only a few fibers, such as thirty 2.5-denier fibers; but a heavier yarn, such as 150 denier, is considered fine only if its fibers are individually as thin as one denier. The following relationship applies to straight, uniform filaments: :DPF = total denier / quantity of uniform filaments The denier system of measurement is used on two- and single-filament fibers. Some common calculations are as follows: In practice, measuring 9000 metres is both time-consuming and unrealistic. Generally a sample of 900 metres is weighed, and the result is multiplied by ten to obtain the denier weight. *A fiber is generally considered a microfiber if it is one denier or less. *A one-denier
polyester Polyester is a category of polymers that contain the ester functional group in every repeat unit of their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include natura ...
fiber has a
diameter In geometry, a diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid f ...
of about ten micrometres. *In
tights Tights are a kind of cloth garment, most often sheathing the body from the waist to the toe tips with a tight fit, hence the name. They come in absolute opaque, opaque, sheer and fishnet styles — or a combination, such as the original concep ...
and
pantyhose Pantyhose, called sheer tights, or tights, are close-fitting legwear covering the wearer's body from the waist to the toes. Mostly considered to be a garment for women and girls, pantyhose first appeared on store shelves in 1959 for the advert ...
, the linear density of yarn used in the manufacturing process determines the opacity of the article in the following categories of commerce: ultra sheer (below 10 denier), sheer (10 to 30 denier), semi-opaque (30 to 40 denier), opaque (40 to 70 denier) and thick opaque (70 denier or higher). For single fibers, instead of weighing, a machine called a vibroscope is used. A known length of the fiber (usually 20 mm) is set to vibrate, and its fundamental frequency measured, allowing the calculation of the mass and thus the linear density.


Yarn length

Given the linear density and weight the yarn length can be calculated; for example: , where is the yarn length in metres, is the English cotton count and is the yarn weight in kilograms. The following length units are defined. *Bundle: usually *Thread: a length of —the circumference of a warp beam *Lea: *Hank: a length of 7 leas or *Spyndle: —used in the English rope industry


Fabrics


Grams per square metre (GSM)

Fabric weight is measured in grams per square metre or g/m2 (also abbreviated as GSM). GSM is the metric measurement of the weight of a fabric—it is a critical
parameter A parameter (), generally, is any characteristic that can help in defining or classifying a particular system (meaning an event, project, object, situation, etc.). That is, a parameter is an element of a system that is useful, or critical, when ...
for any textile product. The weight may affect density, thickness and many physical properties of the fabric, such as strength. GSM is accountable for the linear metres and specific use of the fabric. The fabric weight is measured in grams. In the
metric system The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the Intern ...
, the mass per unit area of all types of textiles is expressed in grams per square metre (g/m2). The gram (alternative spelling: gramme; SI unit symbol: g) is a
metric system The metric system is a system of measurement that succeeded the decimalised system based on the metre that had been introduced in France in the 1790s. The historical development of these systems culminated in the definition of the Intern ...
unit Unit may refer to: Arts and entertainment * UNIT, a fictional military organization in the science fiction television series ''Doctor Who'' * Unit of action, a discrete piece of action (or beat) in a theatrical presentation Music * ''Unit'' (a ...
of
mass Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different ele ...
. A gram is defined as one thousandth of the SI base unit, the
kilogram The kilogram (also kilogramme) is the unit of mass in the International System of Units (SI), having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially. ...
, or . Square metre (alternative spelling: square meter; SI unit symbol: m2) is a superficial area equal to that of a square whose sides' lengths are each one metre. Typically a cheap T-shirt fabric is approximately 150 g/m2. GSM of fabric helps in determining the consumption, cost and application. The more the gsm transposes to thicker and heavy construction.


Mommes

Mommes (mm), traditionally used to measure
silk Silk is a natural protein fiber, some forms of which can be woven into textiles. The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from th ...
fabrics, the weight in pounds of a piece of fabric ''if'' it were sized 45
inch Measuring tape with inches The inch (symbol: in or ″) is a unit of length in the British imperial and the United States customary systems of measurement. It is equal to yard or of a foot. Derived from the Roman uncia ("twelfth ...
es by 100
yard The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3  feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly ...
s (1.2 m by 90 m). One momme = 4.340 g/m2; 8 mommes is approximately 1 ounce per square yard or 35 g/m2. The momme is based on the standard width of silk of 45 inches (1.2 m) wide (though silk is regularly produced in 55-inch (1.4 m) widths and uncommonly in larger widths). The usual range of momme weight for different weaves of silk are: *
Habutai Habutai (from the Japanese , literally "feather-two-layer", also spelled habotai or habutae) is one of the most basic plain weaves of silk fabric. While it was traditionally woven in Japan, most habutai is today woven in China. It is normally a lin ...
—5 to 16 mm * Chiffon—6 to 8 mm (can be made in double thickness, i.e. 12 to 16 mm) * Crepe de Chine—12 to 16 mm *
Gauze Gauze is a thin, translucent fabric with a loose open weave. In technical terms "gauze" is a weave structure in which the weft yarns are arranged in pairs and are crossed before and after each warp yarn keeping the weft firmly in place. ...
—3 to 5 mm * Raw silk—35 to 40 mm (heavier silks appear more "wooly") * Organza—4 to 6 mm * Charmeuse—12 to 30 mm The higher the weight in mommes, the more durable the weave and the more suitable it is for heavy-duty use. Also, the heavier the silk, the more opaque it becomes. This can vary even within the same weave of silk: for example, lightweight charmeuse is translucent when used in clothing, but 30-momme charmeuse is opaque.


Thread count

Thread count, also called threadcount or threads per inch (TPI), is a measure of the coarseness or fineness of fabric. It is measured by counting the number of threads contained in one square inch of fabric or one square centimetre, including both the length (
warp Warp, warped or warping may refer to: Arts and entertainment Books and comics * WaRP Graphics, an alternative comics publisher * ''Warp'' (First Comics), comic book series published by First Comics based on the play ''Warp!'' * Warp (comics), a ...
) and width (
weft Warp and weft are the two basic components used in weaving to turn thread or yarn into fabric. The lengthwise or longitudinal warp yarns are held stationary in tension on a frame or loom while the transverse weft (sometimes woof) is dra ...
) threads. The thread count is the number of threads counted along two sides (up and across) of the square inch, added together. It is used especially in regard to cotton
linen Linen () is a textile made from the fibers of the flax plant. Linen is very strong, absorbent, and dries faster than cotton. Because of these properties, linen is comfortable to wear in hot weather and is valued for use in garments. It also ...
s such as
bed sheet A bed sheet is a rectangular piece of cloth used either singly or in a pair as bedding, which is larger in length and width than a mattress, and which is placed immediately above a mattress or bed, but below blankets and other bedding (such a ...
s, and has been known to be used in the classification of towels. There is a common misconception that thread count is an important consideration when purchasing bedding. However, linen experts claim that beyond a thread count of 400, there is no difference in quality. They further highlight that sheet material is of greater importance than thread count. The amount of thread that can fit into a square inch of fabric is limited, suggesting that bedding beyond 400 count is likely a marketing strategy. Inflated thread counts are usually the result of including the number of strands in a twisted yarn in the claimed thread count.


Industry standard

Thread count is often used as a measure of fabric quality, so that "standard" cotton thread counts are around 150 while "good-quality" sheets start at 180 and a count of 200 or higher is considered " percale". Some (but not all) extremely high thread counts (typically over 500) mislead as they usually count the individual threads in " plied" yarns (a yarn that is made by twisting together multiple finer threads). For marketing purposes, a fabric with 250 two-ply yarns in both the vertical and horizontal direction could have the component threads counted to a 1000 thread count although according to the
National Textile Association The National Textile Association is the United States's oldest and largest association of fabric-forming companies. NTA members knit and weave fabric in the U.S.; supply fibers, yarns to the fabric-forming industry; or supply other materials or ...
(NTA), which cites the international standards group
ASTM ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, an ...
, accepted industry practice is to count each thread as one, even threads spun as two- or three-ply yarn. The
Federal Trade Commission The Federal Trade Commission (FTC) is an independent agency of the United States government whose principal mission is the enforcement of civil (non-criminal) antitrust law and the promotion of consumer protection. The FTC shares jurisdiction o ...
in an August 2005 letter to the NTA agreed that consumers "could be deceived or misled" by inflated thread counts. In 2002, ASTM proposed a definition for "thread count" that has been called "the industry's first formal definition for thread count". A minority on the ASTM committee argued for the higher yarn count number obtained by counting each single yarn in a plied yarn and cited as authority the provision relating to woven fabric in the ''Harmonized Tariff Schedule of the United States'', which states each ply should be counted as one using the "average yarn number." In 2017, the Federal Trade Commission issued a General Exclusion Order barring entry of woven textile fabrics and products marked with inflated thread counts. The inflated thread counts were deemed false advertising under section 43 of the Lanham Act, 15 U.S.C. 1125(a)(1)(B).


In tartans

In the context of
tartan Tartan ( gd, breacan ) is a patterned cloth consisting of criss-crossed, horizontal and vertical bands in multiple colours. Tartans originated in woven wool, but now they are made in other materials. Tartan is particularly associated with Sc ...
s, thread counts are used not for determining coarseness, but rather for recording and reliably repeating the cross-striped pattern of the cloth. Such a thread count (which for the typical worsted woollen cloth used for a kilt must in total be divisible by 4) is given as a series of colour-code and thread-count pairs. Sometimes, with typical symmetrical (reflective) tartans, slash ( / ) markup at the ends is used to indicate whether (and how much of) a "pivot" colour is to be repeated when the design is mirrored and repeated backwards. For example, calls for a pattern of (left to right) blue, white, blue, red, black, green, and white, and indicates that when mirrored the two white threads (going one direction) or 24 blue threads (going the other) are repeated after mirroring, resulting in a total of 4 white going rightward and 48 blue heading left. This is known as a ''half-count at pivot'' thread count. The same sett (technically a half-sett) could also be represented , in a ''full-count at pivot'' thread count; this indicates that after the four white threads, the pattern resumes backwards with 24 green without repetition of any of the white count. The old style, without slash markup——is considered ambiguous, but is most often interpreted as a full count. The comparatively rare non-symmetrical tartans are given in full setts and are simply repeated without mirroring.


Ends per inch

Ends per inch (EPI or e.p.i.) is the number of
warp Warp, warped or warping may refer to: Arts and entertainment Books and comics * WaRP Graphics, an alternative comics publisher * ''Warp'' (First Comics), comic book series published by First Comics based on the play ''Warp!'' * Warp (comics), a ...
threads per inch of woven fabric. In general, the higher the ends per inch, the finer the fabric is. Ends per inch is very commonly used by weavers who must use the number of ends per inch in order to pick the right reed to weave with. The number of ends per inch varies on the pattern to be woven and the thickness of the thread. The number of times the thread can be wrapped around a ruler in adjacent turns over an inch is called the ''wraps per inch''.
Plain weave Plain weave (also called tabby weave, linen weave or taffeta weave) is the most basic of three fundamental types of textile weaves (along with satin weave and twill). It is strong and hard-wearing, and is used for fashion and furnishing fabr ...
s generally use half the number of wraps per inch for the number of ends per inch, whereas denser weaves like a twill weave will use a higher ratio like two-thirds of the number of wraps per inch. Finer threads require more threads per inch than thick ones and thus result in a higher number of ends per inch. The number of ends per inch in a piece of woven cloth varies depending on the stage of manufacture. Before the cloth is woven, the warp has a certain number of ends per inch, which is directly related to the size reed being used. After weaving, the number of ends per inch will increase, and it will increase again after being washed. This increase in the number of ends per inch (and picks per inch) and shrinkage in the size of the fabric is known as the take-up. The take-up depends on many factors, including the material and how tightly the cloth is woven. Tightly woven fabric shrinks more (and thus the number of ends per inch increases more) than loosely woven fabric, as do more elastic yarns and fibers.


Picks per inch

Picks per inch (or p.p.i.) is the number of
weft Warp and weft are the two basic components used in weaving to turn thread or yarn into fabric. The lengthwise or longitudinal warp yarns are held stationary in tension on a frame or loom while the transverse weft (sometimes woof) is dra ...
threads per inch of woven fabric. A pick is a single weft thread, hence the term. In general, the higher the picks per inch, the finer the fabric is.


Courses and wales

Loops are the building blocks of
knitted fabrics Knitting is a method by which yarn is manipulated to create a textile, or fabric. It is used to create many types of garments. Knitting may be done by hand or by machine. Knitting creates stitches: loops of yarn in a row, either flat or ...
, and courses and wales in knitted fabrics are importantly similar to ends and pick in woven fabrics. The knitting structure is formed by intermeshing the loops in consecutive rows. * Courses are the total number of horizontal rows measured in per inch or per centimetre. The course is a horizontal row of loops formed by all the adjacent needles during one revolution. Course length is obtained by multiplying loop length with the number of needles involved in the production of the course. * Wales are the number of vertical columns measured in per inch or per centimetre. * Because the number of courses and wales per inch or per centimetre infers (more or less) the tight and loose knitting. Stitch or loop density is the total number of loops in a unit area such as per square centimetre or per square inch. * Stitch/loop length is a major factor in a knitted fabric's overall quality, affecting dimensional stability, drape and appearance, etc. Loop length is the length of yarn contained to form a loop.


Air permeability

Air permeability is a measure of the ability of air to pass through a fabric. Air permeability is defined as "the volume of air in cubic centimetres (cm3) which is passed through in one second through 100 cm2 of the fabric at a pressure difference of 10 cm head of water", also known as the Gurley unit. It is standardized by, among others, nor
ASTM D737-18
and nor

Factors that affect air permeability include
porosity Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measur ...
, fabric thickness and construction, yarn density, twist, crimp, layering, and moisture within the fabric. The concept of air permeability is important for the design of active wear and insect netting.


References


Bibliography

* *


External links


Textiles Intelligence Glossary
{{DEFAULTSORT:Units Of Textile Measurement Textiles Units of measurement