The formula for calculating the weight of cloth:
g/y=[(经 secret/meridian branch+ Weft density/weft branch)*width*0.582]
1 For example:
C110*90*90”40s110m
（110/40+90/40)*90*0.582=261.9g/y
110/0.9144*261.9=31506g=31.5kg
Do you understand? 0.582 is a fixed value. The first step above is to calculate the gram weight of each yard of cloth, then convert the meter length of the cloth into the total yard length, and finally multiply it by the weight of each yard of cloth. You can try it out, it will be used often.
Grain weight:
Refers to the weight per unit area of the fabric, generally expressed in grams per square meter (g/ m2). The simplest calculation method in business.
2 For example:
Cotton fabric is generally 70~250g/ Within the range of m2; the weight of veldine (combed) wool fabric is about 185g/m2; the weight of thick tweed (carded) is about 280g/m2; the weight of thin silk fabric is generally between 20 and 100g/m2.
The weight of gray cloth is also one of the quality indicators for assessing the physical properties of fabrics, which is more important for woolen fabrics. In the “Ministry-issued” standards for combed wool fabrics and wool-type chemical fiber fabrics, it is stipulated that if the square meter weight is too light and cannot exceed the allowable tolerance (stipulated as 5%), it will be classified as a first-class product; if it exceeds 5% but does not exceed 7%, it will be classified as a first-class product. Second class product.
According to the calculation method according to the “Ministry Standards” (the moisture regain factor should be deducted):
In the formula:
GK–The square meter weight under the public moisture regain (g/m2)
GO–The dry weight of the sample (g)
WK –Normal moisture regain of the sample (%)
L–Sample length (cm)
B–Sample width (cm)
The constant moisture regain (WK) of commonly used yarns is excerpted as follows:
Cotton yarn: 8.5%
Combed wool yarn: 16%
Carded wool yarn: 15%
Polyester/cotton yarn (65/35): 3.2%
Approximate estimation based on fabric structure factors Calculation method of square meter weight:
In the formula: NtT–Number of warp Tex (number)
NTw–Number of weft Tex (Number)
PT–Warp yarn density (root/250px)
PW–Weft yarn density (root/250px)
This calculation formula is an approximation and does not take into account the bending, elongation of the yarn and the weight change of the fabric during processing.
(Note: The Tex number (number) refers to the weight (g) of a 1,000-meter-long yarn at a common moisture regain.)
The dry weight of one square meter of cotton cloth without pulp
G——The dry weight of one square meter of cotton cloth without pulp ( grams);
Gj——The dry weight of the warp yarns of one square meter of cotton cloth (grams);
Gw——The dry weight of the weft yarns of one square meter of cotton cloth (grams) grams);
Pj——The warp density of cotton cloth (roots/10 cm);
Pw——The weft yarn density of cotton cloth (roots/10 cm);
gj——Standard dry weight of warp yarn spinning (g/100m);
gw——Standard dry weight of weft yarn spinning (g/100m);
Fj—— —The total fly rate of warp yarns;
aj—the warp yarn shrinkage rate;
Sjz—the total warp yarn elongation rate;
aw—the weft yarn shrinkage rate.
Among them:
1. Standard dry weight of warp and weft yarns (g/100) = metric number * 0.92166/ 10 or = 53.74/imperial count
2. The weight of the strands is calculated based on the combined weight.
3. Total warp elongation: The sizing single yarn is calculated as 1.2% (of which winding and warping are calculated as 0.5%, and the sizing yarn is calculated as 0.7%).
Sheung Shui stocks below No. 102 are calculated as 0.3%, and stocks above No. 102 are calculated as 0.7%.
4. The elongation of indirect weft yarn is small and can be ignored.
5. The total warp fly rate: coarse (count) fabric is calculated as 1.2%; medium (count) plain weave fabric is calculated as 0.6%, twill fabric is calculated as 0.9%; Fine size (count) fabrics are calculated as 0.8%; thread fabrics are calculated as 0.6%.
6. The total elongation of warp yarns, the total fly rate of warp yarns and the weaving shrinkage rate of warp and weft yarns are the basis for calculating the weight of one square meter of fabric, and are not prescribed indicators.
But the above formulas are all from the perspective of technicians, who are actually doing sales. How can they have time to go through the trouble of using computers one by one when facing customers? Let’s do the math? Therefore, it is best for marketers to use the following formula, (just understand the above)
The simplest: (for price verification and workshop yarn estimation)
The warp yarn used for 100 meters = warp density/count * door width * 0.0065
The weft yarn used for 100 meters = weft density/count * door width * 0.0065
More reasonable: (for craftsmen)
Warp yarn for 100 meters = (warp number * total warp number / (1 -Warp shrinkage))/10000*1.01
100 meters of weft yarn = number of weft yarns * weft density * 3.937* (reed width + yarn return) / 100000 * 1.003
Spill yarn – take 300px for elastic yarn and 200px for plain yarn
Amount of yarn used per 100 meters (KG/100 meters) = ( Warp density + weft density) sub)=precision*1.1*59/(2.54*yarn count)+weft density*1.1*59/(2.54*yarn count)
Longitude and latitude
a. Longitude (latitude) density/2.54–convert imperial density to metric density
b. Coefficient 1.1 – taking into account the warp (weft) shrinkage and warp (weft) yarn loss, it is about 10%. Although there is a deviation, it is not a big deal as a convenient and quick calculation
c.59/yarn count–converts British yarn count to metric special number. It combines the conversion coefficients of cotton 583.1, polyester 590.5, etc., and takes the coefficient of 590. Although there is an error, it is not big.
d. I will not list the specific unit conversions involved.
To sum up: warp a*b*c+ weft a*b*c
=precision+weft density)*1.1*59/( 2.54*yarn) = square meter weight of gray cloth
e.g. Fabric cost accounting information
Amount of yarn used per meter = (warp density + weft density) X0.065X finished product width X1.01
3 Example:
45sT/C*45sT/C110*7058/59″ polyester cotton rice (yarn price: 26,000 yuan/ton)
For short fiber types, the following formula can be used to calculate the square meter weight
Warp weight = (imperial warp density/imperial yarn count)* 23.25
Weft weight = (imperial weft density/imperial yarn count) * 23.25
For filament yarns, you can use the following formula to calculate the square meter weight Formula
Warp weight = (Length denier*imperial warp density)/228.6
Weft weight = (Lateral denier*Imperial system) Weft density)/228.6
Conversion between the grammage of gray fabric and the grammage of finished product
The conversion between the gram weight of the gray fabric and the gram weight of the finished product, if calculated by a formula, may deviate greatly from the reality. The main reasons are twofold. The setting of the gray fabric can be calculated by a formula. As long as the conditions are closer, the result will be more accurate. Because weaving is a physical change, the raw fabric is processed into finished fabric. After multiple processes of dyeing and finishing, the fabric undergoes physical and chemical changes, and the variables increase. During the process, various types of machinery, processes, etc. are involved, forming various types of fabrics. Companies have different specifications and standards, so each company has its own standards for converting the weight of gray fabric into the weight of finished product.
How to establish an enterprise conversion formula
It is recommended to collect the enterprise’s past results from embryonic fabrics to finished fabrics, and then use a computer to filter the most results as the standard, and then according to the enterprise’s production situation, Evaluate its practicality and then set the conversion formula.
Reference: (General cloth, general weaving, dyeing and finishing technology)
Embryo weight = order finished product weight x embryo weight coefficient
Cloth/embryo weight coefficient
Plain weave 92%
Double beads 88%
Double-position clothing 89%
Single beads 93%
Unit clothing 89%
Stretch plain weave 100%
Towel 106%
Double-sided 88%
Stretch rib 91%
Rib 83%
Stretch rib 92%
Lamp core 87%</p
