What are the formulas for calculating the weight of knitted fabrics?
What are the formulas for calculating the gram weight of knitted fabrics? The gram weight of fabrics generally refers to the gram weight in square meters. A commonly used gram weight tester is used. Everything is 10 square centimeters. After weighing it with a balance, multiply the number of grams obtained by 1000 to get the gram weight. .
How to calculate the weight of knitted fabric?
It is the weight of fabric length 1 meter * width 1 meter. If you don’t have such a large piece of fabric on hand, If so, you can weigh 0.5 meters * 0.5 meters in grams, and then convert it into square meters.
Gram weight: A commonly used unit for evaluating textile silk products is the weight of fabric per square meter. The unit is “grams per square meter” (g/m2), abbreviated as FAW.
To calculate, you must first clarify two formulas:
1. Yarn count (English count) is what we usually use S to represent, The conversion formula to denier (represented by D): S=5315/D
2. Denier represents the number of grams of yarn of 9000 meters. For example, the 100D we often say represents 9000 The weight of the rice yarn is 100 grams.
Knowing these two points, it is easy to understand the formula.
Example: 40S*40S/133*72 63″, 133*72 means the number of warp and weft threads per inch, 63″ means the width of the fabric is 63 inches.
What are the calculation formulas?
Amount of warp yarn per meter: 133×63×(5315÷40)÷9000×1.1 (Weaving shrinkage) = 136 grams, where the weaving shrinkage varies according to the thickness and density of the weft yarn. The thicker and denser the weft yarn, the higher the weaving shrinkage.
Weft yarn usage per meter: 72×63×(5315÷40)÷9000=70 grams
Then multiply the yarn usage per meter by the yarn price, for example The combed yarn of 40S is 25 yuan/kg, then the cost of the fabric yarn is (136+70)÷1000×25=5.15 yuan
Then plus the weaving cost, the general arrow shaft machine is 3 points per weft, that is: 72*0.03=2.16 yuan
The total price of the fabric is: 5.15+2.16=7.31, and some of them can be rounded.
How to calculate the weight and price of woven stretch fabric
Let’s take a look first. The principle of weft stretch fabric is the same.
Generally, the gray fabric of stretch fabrics can reach 72″, and the door width of the dyed finished product is only 48″/50″. Generally, the ratio of the door width of the gray fabric on the machine to the finished door width is: 1.44~1.48:1, the specific requirements are Check whether the fabric is plain, twill or satin. Some manufacturers also deliberately reduce the width of the machine in order to cut corners.
Example: 40S*40S+40D/133*72 48″/50″, this In order to determine the door width and warp and weft density of the finished product, the door width of the gray fabric must be 72″.
Amount of warp yarn per meter: 133 (finished product warp density)×50 (finished product width)×(5315÷40)÷9000×1.1=108 grams
Weft yarn per meter Dosage: 72 (weft density) × 72 (door width) × (5315÷40) ÷9000*1.1 = 84 grams
72 (weft density) × 72 (door width) × 12 (denier )÷9000=7 grams, Note: 40D spandex is generally converted to 12D, 70D spandex is generally converted to 25D
The amount of weft yarn per meter is: 84+7=91 grams
The above is the fabric knowledge compiled by the editor on how to calculate the gram weight of knitted fabrics and what the calculation formulas are. I hope this article can be helpful to you. At the same time, Xiaobu hopes that everyone must be cautious when buying fabric products and be careful of being deceived.
Keywords:
Knitted fabric weight
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