Calculation of yarn raw material dosage
Calculation of yarn raw material dosage
Amount of raw materials: Amount of raw materials required to weave 1 meter of cloth
1. Untwisted long fiber fabric
Warp: G/M total number of warps * D/9000 *
(1+X%)
Weft: G/M gray fabric weft density * upper machine door width * D/9000 * (1+X%)
X% includes: ①Natural shrinkage of raw materials
②Loss
③Weaving shrinkage rate
④Difference rate of warp and weft raw materials
Comprehensive =﹥X% experience value
FDY:6～8%
DTY (net), FDY+POY, PNT: 8～10%
Example 1.70D nylon FDY * 21S C +70D SP; 110 * 86; 59” 150cm; upper machine door width 208cm
Request: SP?%; C?%; Nylon?%
calculate:
Warp: 110 * 59 * 70/9000 * (1+6%) = 53.5g/m
Latitude: 21S==﹥5315/21=253D 70D SP=25D
86
Gray cloth weft density=————————=32.9
2.54*(1+3%)
Latitude: 32.9*208*
278/9000 * (1+12%)＝236.74g/m
Total = longitude + latitude = 236.74 + 53.5 = 290.2g/m
25/278 * 236.7
Spandex ratio:————————*100%=7.3%
290.2
53.5
Nylon ratio:————*100%=18.44%
290.2
C＝1-18.44%-7.3%＝74.26%
Example 2. 68D DTY network * 130D/144FDTY network
17# * 3 pieces *165cm
27 pieces/cm
calculate:
Warp=17*3*165*68/9000*(1+8%)=68.67g/m
Weft = 27*165*130/9000* (1+10%) = 70.78g/m
2.Twisted long fiber fabric:
Warp: Total warp number * D/9000 * (1+X%)* (1+ twist shrinkage rate) * (1+ steam shrinkage rate)
Weft: gray fabric weft density * upper machine door width * D/9000
* (1+X%)*(1+twist shrinkage rate)*(1+steam shrinkage rate)
A. Twist shrinkage = 0.0038 * (T/MM) 2 * D/10
Example 1. 75D FDY 18T/2S2Z =﹥18T/CM=1.8T/MM
Twist shrinkage=0.0038*(1.8)2*75/10*100%=9.23%
B.Steam shrinkage rate: 8～18T/CM 5%
18T/CM or above 6.5%
Below 8 T/CM Ignore
Shaping: fixing the state of twisted yarn
Example 2. 75D Glossy FDY * 150D DTY 16T/2S2Z
17# * 5 pieces *168cm 30 pieces/cm
Calculation: 17*5*168*75/9000*(1+6%)＝126.14g/m
Weft: 30*168*1150/9000*(1+10%)*(1+0.0038*(1.6)2*150/10)*(1+5%)
=84*1.1*1.15*1.0=111.18g/m
3.Short fiber fabrics
G/M =0.6498 * ——————
Sj (warp yarn count)
Weft density * door width
Latitude G/M=0.64984 * ——————
Sw (weft yarn count)
Example 1.30S C * 30S C 133*72 59”
calculate:
through
0.64984 * 133*59/30＝169.98g/m
Weft
0.64984 * 72*59/30＝92.02g/m
Total = longitude + latitude = 169.98 + 92.02 = 262g/m
Example 2. 70D nylon FDY * 21S
C 110*86 59”
Compare long fiber algorithm and short fiber algorithm
Staple fiber: weft=0.64984 * 86 * 59/21=157.8
Long fiber: weft = 32.9 * 162 * 253/9000 * (1+8%) = 161.8g/m
Weft usage = weft density on the upper machine * (door width on the upper machine + discarded edge yarn) * D/9000 * (1+X%)
Example 3. Longitude 70D nylon FDY; weft: A is 32S
C, B is 32S C + metal wire 68D
The latitude lines are arranged 5A and 1B 133 * 72 59”
Required: Metal wire ratio
calculate:
Warp=133*59*70/9000*(1+6%)=64.69g/m
Weijia＝0.64984 * 72 * 59/32 * 5/6＝71.89g/m
Wei Yi=0.64984 * 72 * 59/32 * 1/6 + 72 * 59
*68/9000 *(1+8%)*1/6＝14.38+5.78＝20.16
Metal wire ratio=5.78/(64.69+2016)*100%=6.8%
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Required: Metal wire ratio
calculate:
Warp=133*59*70/9000*(1+6%)=64.69g/m
Weijia＝0.64984 * 72 * 59/32 * 5/6＝71.89g/m
Wei Yi=0.64984 * 72 * 59/32 * 1/6 + 72 * 59
*68/9000 *(1+8%)*1/6＝14.38+5.78＝20.16
Metal wire ratio=5.78/(64.69+2016)*100%=6.8%
Disclaimer:
Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.
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