Common textile calculation formulas and identification methods

**1 The commonly used calculation formulas for fabrics are divided into two types: fixed-length calculation formulas and fixed-weight calculation formulas. **

Fixed length calculation formula:

(1), Denier (D) =g/L*9000 where g is the weight of the silk thread (grams), L is the length of the silk thread (meters)

(2), Tex (number) [tex(H)]: tex=g/L*1000 where g is the weight of the yarn (or silk) (grams), and L is the yarn (or silk) length (meters)

(3), decitex (dtex): dtex=g/L*9000 where g is the weight of the silk thread (grams), L is the length of the silk thread (meters)

Fixed weight calculation formula:

(1), metric count (N): N=L/G where G is the weight of the yarn (or silk) (grams), L is the length of the yarn (or silk) (meters)

(2), British count (S): S=L/(G*840) where G is the weight of the silk thread (pounds), L is the length of the silk thread (yards)

2Select the conversion formula

(1), metric number (N) and denier (D) conversion formula =9000/N

Conversion formula for (2), imperial count (S) and denier (D) =5315/S

(3), the conversion formula of decitex (dtex) and tex (tex): 1tex=10dtex

(4), tex (tex) and denier (D) conversion formula: tex=D/9

Conversion formula for (5), tex (tex) and imperial count (S): 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 Textile cotton yarn (50:50) K=587.0

Conversion formula for (6), tex (tex) and metric number (N): tex=1000/N

(7), decitex (dtex) and denier (D) conversion formula: dtex=10D/9

Conversion formula for (8), decitex (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 Textile cotton yarn (50:50) K=587.0

Conversion formula for (9), decitex (dtex) and metric number (N): dtex=10000/N

(10), metric centimeter (cm) and imperial inch (inch) conversion formula: 1inch=2.54cm

(11), metric meter (M) and imperial yard (yd) conversion formula: 1 yard = 0.9144 meters

(12), the conversion formula of satin weight per square meter (g/m2) and mm (m/m): 1m/m=4.3056g/m2

(13). The conversion formula between the actual weight of satin and the pound weight: pound weight (lb) = weight per meter of silk (g/m)*0.9144 (m/yd)*50 (yd) /453.6(g/yd)

1 Hand visual inspection method: This method is suitable for fabric raw materials in the state of loose fibers.

(1) Cotton fiber is shorter and thinner than ramie fiber and other hemp craft fibers and wool fibers, and often contains various impurities and defects.

(2). Hemp fiber feels thicker and harder.

(3). Wool fiber is curly and elastic.

(4) Silk is filament, long and slender, and has very good luster.

(5). Among chemical fibers, only viscose fiber has a large difference in strength between dry and wet states.

(6) Spandex yarn has extremely high elasticity, and its length can be stretched to more than five times at room temperature.

2 Microscopic observation method: Identify fibers based on their longitudinal and cross-sectional morphological characteristics.

(1) Cotton fiber: cross-sectional shape: round waist, with mid-waist; longitudinal shape: flat belt-shaped, with natural twist.

(2) Linen (ramie, flax, jute) fiber: cross-sectional shape: waist-round or polygonal, with a middle cavity; longitudinal shape: horizontal sections and vertical lines.

(3) Wool fiber: Cross-sectional shape: round or nearly round, some with pith; Longitudinal shape: scales on the surface.

(4) Rabbit hair fiber: cross-sectional shape: dumbbell shape, with pith; longitudinal shape: scales on the surface.

(5). Mulberry silk fiber: cross-sectional shape: irregular triangle; longitudinal shape: perfectly smooth and straight, with vertical stripes.

(6) General viscose fiber: Cross-sectional shape: zigzag shape, sheath-core structure; Longitudinal shape: longitudinal grooves.

(7) Rich and strong fiber: cross-sectional shape: less tooth-shaped, or round, oval; longitudinal shape: smooth surface.

(8) Acetate fiber: cross-sectional shape: trilobal or irregular zigzag; longitudinal shape: longitudinal stripes on the surface.

3. Density – used to indicate the number of yarns spun per unit length of woven fabrics, generally the number of yarns spun in 1 inch or 10 centimeters. my country’s national standards stipulate that 10 centimeters are used. The number of inner-spun yarns indicates density, but fabric companies are still accustomed to using the number of inner-spun yarns in 1 inch to express density. For example, the commonly seen “45X45/108X58” means that the warp and weft yarns are 45 respectively, and the warp and weft density are 108 and 58.

4. Effective width – the effective width of the fabric, usually expressed in inches or centimeters. Common ones are 36 inches, 44 inches, 56-60 inches, etc., which are called narrow width, medium width respectively. Width and width, fabrics higher than 60 inches are extra wide, generally called wide cloth. The effective width of extra wide fabrics in my country today can reach 360 cm. The effective width is generally marked after the density. For example, if the fabric mentioned in 3 is added with the effective width, it will be expressed as: “45Ｘ45/108Ｘ58/60＂”, that is, the effective width is 60 inches.

5. Weight per square meter – the weight per square meter of fabric is generally the weight of grams per square meter of fabric. The weight per square meter is an important technical indicator of knitted fabrics, woolen woolen Weight per square meter is usually also regarded as an important technical indicator. The weight of denim fabric per square meter is generally expressed in “ounces (OZ)”, which is the number of ounces of fabric weight per square yard, such as 7 ounces, 12 ounces of denim, etc.;

6. Yarn-dyed weaving-called “first-dyed fabric” in Japan, which refers to the process of dyeing the yarn or filament first, and then using the dyed yarn to weave the fabric. This kind of fabric It is called “dyed fabric”, and factories that produce yarn-dyed fabric are generally called dyeing and weaving factories, such as denim and most shirt fabrics;

1. Classification according to different organizing methods

(1) Woven fabric: A fabric composed of two systems of yarns arranged vertically, that is, transverse and longitudinal systems, interlaced on a loom according to certain rules. There are denim, brocade, flat cloth, linen, etc.

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