Yarn count expression, calculation, conversion and other knowledge
Yarn count, referred to as yarn count, refers to the thickness of the yarn, its expression methods are S, D, N, Tex, Dtex and so on. Specific fabrics are used with specific specifications, of which S and D are more commonly used. The technical literature generally converts tex.
Yarn count representation:
Yarn count is a way of yarn representation, usually expressed in the "fixed weight system" (this calculation method is divided into metric and imperial count two), that is, under the condition of common moisture recovery (8.5%), the weight of one pound of yarn, the number of strands of 840 yards per strand is the number of strands. The count depends on the length and weight of the yarn.
For example, if one or two pieces of cotton make 30 yarn of 1 meter in length, that is 30 yarn; One or two cottons made into 40 yarn lengths of 1 meter, that is 40 yarn; 1 Two cottons made into 60 yarn lengths of 1 meter, that is 60 yarn.
Therefore, the higher the number of yarn, the finer the yarn, the better the uniformity, the thinner the woven cloth, the more soft and comfortable the cloth is. Obviously, the higher the number of cloth requires the higher the quality of raw materials, and the requirements for cotton mills and weaving mills are also relatively high, so the cost of cloth is higher.
Generally speaking, above 30S is called high count yarn, (20s-30s) is medium count yarn, and below 20S is low count yarn.
Yarn density: refers to the number of warp and weft threads arranged per square inch, also known as warp and weft density. Generally, it is expressed by "number of warp threads * number of weft threads".
Several common densities such as 110* 90,128 * 68,65 * 78,133 *73, indicating that the warp per square inch are 110, 128, 65, 133; The weft threads are 90, 68, 78, 73.
Calculation unit of yarn count:
Imperial count (Ne): An indirect system of counting yarn that represents a multiple of 840 yards of length of 1 pound of yarn at a common moisture regain rate, i.e.,1 pound of yarn is exactly 840 yards long and is 1(NE) yarn (the number of yarns per pound of 840 yards).
S is the British count, it refers to the common moisture return rate, the weight of a pound of yarn, its length of several 840 yards, called several yarns.
In general, the yarn branches of staple fiber are expressed in S, and the staple fiber is expressed in English as Spun. The thicker the yarn, the smaller the S value; The thinner the yarn, the larger the S value, for example, the yarn count of 40S is thinner than 20S.
D is the abbreviation of Denier (Daniel), is a method of fineness representation of chemical fiber, refers to the weight of 9,000 meters of silk at a fixed moisture return rate in grams. Generally, the number of Filament is represented by D, and the filament is expressed as filament in English. A larger D indicates a thicker yarn, for example, 75D is thicker than 50D
Tex, also known as "number", referred to as special, formerly known as the public branch. It refers to the number of grams of weight of 1000 meters of yarn at a common moisture regain.
The Nm metric count refers to the meter multiple of the length of 1 kg of heavy yarn under the common moisture return rate, that is, 1 kg of heavy yarn is exactly 1 meter long (male) yarn, 1 kg of heavy yarn length is 200 meters long, and the fineness of yarn is 200 pieces. The metric count is also fixed weight, so the larger the count, the finer the yarn.
dtex, or fen for short, refers to the number of grams of a 10,000-meter-long bundle of fibers.
The calculation formula of yarn count
1, fixed length system calculation formula:
(1), Denier: 9000 meters of silk in the common moisture return rate of the mass grams called denier.
Common formula: Nden= (G/L) ×9000
Where G is the weight of the silk (g) and L is the length of the silk (m).
(2) Tex: The mass gram number of 1000 meter length yarn at the common moisture return rate is called the special number.
Common formula: Ntex = (G/L) x 1000
Where G is the weight of the yarn (g) and L is the length of the yarn (m).
(3), divided Tex (dtex): dtex=g/L*100, where g is the weight of the silk thread (g),L is the length of the silk thread (m)
2. Calculation formula of fixed weight system:
(1) Metric count (N): the length of 1 gram yarn (silk) in meters. N=L/G where G is the weight of the yarn (or silk) in grams and L is the length of the yarn (or silk) in meters
(2), Imperial count (S): The number of 840 yards of length for 1 pound of yarn. S=L/(G*840) where G is the weight of the thread (pounds) and L is the length of the thread (yards)
Yarn count conversion formula:
Common conversion formulas for several units are: D=5315/S,D=9000/N,Tex=D/9,1Tex=1/10Dtex,Tex=1000/N,Dtex=10D/9,Dtex=1000/N
Specifically as follows
1. Conversion formula of metric count (N) and Denier (D) :D=9000/N
2. Conversion formula of imperial count (S) and Denier (D) :D=5315/S
3, the conversion formula of dtex and tex :1tex=10dtex
4, tex and Denier (D) conversion formula :tex=D/9
5, tex and imperial count (S) conversion formula :tex=K/S K value: pure cotton yarn K=583.1 pure chemical fiber K=590.5 polyester cotton yarn K=587.6 cotton viscose yarn (75:25)K=584.8 dimensional cotton yarn (50:50)K=587.0
6, tex and metric number (N) conversion formula :tex=1000/N
7, the conversion formula of dtex and Denier (D) :dtex=10D/9
8, the conversion formula of dtex and imperial count (S) : dtex=10K/S K value: pure cotton yarn K=583.1 pure chemical fiber K=590.5 polyester cotton yarn K=587.6 cotton viscose yarn (75:25)K=584.8 dimensional cotton yarn (50:50)K=587.0
9. Conversion formula between dtex and metric count (N) :dtex=10000/N
10. The conversion formula of metric centimeter (cm) and British inch (inch) is :1inch=2.54cm
11, metric meter (M) and British code (yd) conversion formula :1 yard =0.9144 meters
12, the conversion formula of silk square meter weight (g/m2) and m/m (m/m) :1m/m=4.3056g/m2
13, the actual weight of silk and pound weight conversion formula: pound weight (lb)= per meter silk weight (g/m)*0.9144(m/yd)*50(yd)/453.6(g/yd)
Yarn comprehensive tester:
Automatic yarn comprehensive test system is mainly used for yarn diameter, yarn count, yarn hairiness, line dry uniformity, yarn defects (thickness, detail) test.
Computer control, all Chinese graphical interface, high degree of automation, easy to operate;
Test parameters such as: sample length, yarn speed, hair length, yarn defect classification, can be set by the user on the computer screen through the keyboard, the instrument can visually display the dynamic test data and yarn shape curve on the computer screen;
Test data can be saved on disk or printed in report form. At the same time, it has the function of historical test data query; Free software upgrade is available.
Common defects in yarn count:
Edge missing weft: The edge fabric is missing a weft. Cause: opening time is too early and easy to edge weft; Early withdrawal sword is also easy to lack latitude, latitude jump; Returning the sword too late is also easy to miss the weft (pull break).
Strip dry: yarn weight is not symmetrical strip dry.
Cloth drag yarn: short for yarn tail. The excess yarn of the broken warp joint is not cut off, which affects the dyeing quality.
Sundries: There are foreign bodies woven into the cloth surface 0.3cm assessment.
Rough warp: the warp is thicker than the original yarn, called rough warp. 50cm.
Thick weft: the weft is thicker than the original yarn, called thick weft. Full width 3.
Warp shrinkage: parallel 3 loose warp length of 1cm warp, loose and tight, called warp shrinkage.
Thin dense road: broken latitude, stop the platform, put too much teeth caused by dense road or weft dense teeth slip (bad car); Broken weft stop driving, put too little teeth caused by thin road.
Wave pattern: parking platform driving teeth put too much resulting in wave pattern or harness clamp off or broken car, three.
Harness wrong: 50cm not according to the process requirements of harness or reed.
Oil warp: the warp is oily and dark.
Oil weft: The weft is greasy, dark, two shed.
Oil stains: There are oil stains on the cloth.
Holes: warp or weft broken more than 3 holes called holes, 5 and more assessment.
Edge brace: continuous edge, edge piercing ring is not flexible. Or help the dismantling cloth is improper handling caused by one-time weft or warp wear or hair, called edge support.
Cloud weaving: The cloth is sparse and dense or a blossoming thin dense, called cloud weaving.
Double warp: there is excess yarn in the knitting mouth, which refers to two warp threads in a heald.
Tear marks: Tear marks caused by improper handling of the blank.
Missing edge: 5 or more broken yarn on the fabric edge are not jointed, resulting in missing edge.
Knot head: spun cotton, cotton, cotton can take twist head. Multiple broken warp threads (resulting in knots to the joint) within 5cm of 10 check.
Reed path: damage caused by the reed tooth, caused by improper operation.
Weft shrinkage: weft loop, weft shrinkage. The weft is loose between the cloth.
