﻿SPINNING TESTS OF COTTON. 

 BREAKING STRENGTH* OF YARNS. 



17 



The cotton of each compression was spun into 40's, 50's, and 60's 

 yarn with twists equal to 4.00, 4.25, and 4.50 times the square root 

 of the number spun. The average breaking strength of these yarns 

 are shown in Table 16. 



Table 16. 



-Breaking strength in pounds per skein of 120 yards of yarn spun from Webber 

 49 cotton, 1\ inch staple. 





New 



Draper 



standard. 



Twist 

 multiplier. 



Type of bale. 



No. of yarn. 



Flat. 



Stand- 

 ard. 



High 



density. 



High 

 density 



wet. 



40's 



Pounds. 

 61 



48 



39 



f 4.00 

 \ 4.25 

 [ 4.50 



Average. . 



[ 4.00 

 I 4.25 

 { 4.50 



Average. . 



f 4.00 

 i 4.25 

 I 4.50 



Average. . 



Pounds. 

 44.2 

 45.3 

 44.2 



Pounds. 

 45.7 

 47.0 

 45.7 



Pounds. 

 46.7 

 46.0 

 45.7 



Pounds. 

 47.0 

 46.0 





46.2 





44.6 



46.1 



46.1 



46.4 



50's 



35.0 

 35.0 

 34.0 



36.5 

 35.3 



34.7 



36.4 

 34.7 

 34.6 



34.5 

 33.8 





33.2 





34.7 



35.5 



35.2 



33.8 



60's 



25.9 

 24.8 

 25.5 



26.3 

 25.9 

 25.6 



25.8 

 25.5 



24.8 



25.9 

 24.9 





24.5 





25.4 



25.9 



25.4 



25.1 



Table 16 shows that there is practically no difference between 

 the strength of the yarns spun from the different types of bales. 

 None of the yarns broke as strong as the new Draper standard. 



IRREGULARITY OF YARNS. 



The following figures give the irregularity in the sizings and break- 

 ing strengths of the yarns spun from the different types of bales : 



Sizing Break 



(percent), (percent). 



Flat bale 1. 92 5. 51 



Standard or railroad compressed bale 2. 02 4. 96 



High-density bale 1. 98 4. 73 



High-density bale compressed wet 2. 00 4. 68 



These figures indicate that there is practically no difference in the 

 irregularity of the sizings or strengths of the yarns from the different 

 types of bales. 



The results of the calculations of the irregularity of the yarns are 

 verified by tests on the Moscrop single-strand tester. Figure 4 is 

 a photograph of a chart made by this tester when breaking 50 's yarn 

 spun from cotton compressed to different densities. 



Each dot in this figure represents the breaking strength of a single 

 strand of yarn 12 inches long. The greater the distance these dots 

 are from a horizontal line, the more irregular the yarn. 



