Drawframe is a very critical machine in the spinning process. It has influence on quality, especially on evenness. If drawframe is not set properly, it will result in drop in yarn strength and yarn elongation at break. The faults in the sliver that come out of drawframe can not be corrected . It will pass into the yarn.
The factors that affect the yarn quality are
1. the total draft
2. no of drawframe passages
3. break draft
4. no of doublings
5. grams/meter of sliver fed to the drawframe
6. fibre length
7. fibre fineness
8. delivery speed
9. type of drafting
10. type of autoleveller
11. autoleveller settings
• The total draft depends upon
1. material processed
2. short fibre content
3. fibre length
http://www.cottonyarnmarket.net/OASMTP/PROCESS%20PARAMETERS%20IN%20DRAW%20FRAME.pdf
Reduce Uster of Finisher DrawFrame (In Hindi)
https://www.youtube.com/watch?v=ZUZFKGxRQwo
concept of yarn irregularity: The spinning of even yarns from staple fibres is dependent on certain technical limits. The fundamental requirements for an optimum mass distribution would be the same number of fibres each having the same fineness in each having the same fineness in each section of the yarn. No present existing spinning system is in a position to produce a yarn always having the same number of fibres in the cross section. The theoretical limit of irregularity is if referred to as the limiting irregularity and can be calculated.
The index of irregularity I am characteristics without a unit which gives an indication of the degree to which the mass variations of a fibre assemble deviate from the ideal fibre distribution. In order to able to calculate the limiting irregularity of yarns spun from fibres with a high variation in fibre fineness a formula is used.
The average value for all the deviations from the mean which is expressed as a percentage of the overall mean is called percentage of Mean Deviation (PMD). This is termed U% by the Uster Company.
Coefficient of mass variation (CV %)
The coefficient of mass variation CV % is the ratio of standard deviation of mass variation divided by average mass variation. The higher the CV value is the more irregular the yarn
Uster hairiness index: The hairiness index H corresponds to the total length of protruding fibres within the measurement field of 1cm length of the yarn .
Effect of yarn unevenness, coefficient of variation and hairiness on fabric: The yarn unevenness, coefficient of variation and hairiness may create different problem on fabric surface under consideration of major fabric properties such as fabric appearance, clear structure, good luster on fabric surface, hand feel of fabric, water absorption, abrasion resistance, fabric strength, pilling tendency and as well as other effects on dyed and printed fabric surface .
Machines used during production of a batch of blended spun yarn in an experiment:
Carding machine: Trutzschler-03
Drawframe machine: TOYOTO (DX- 10)
Simplex machine: TOYOTO (FL- 100)
Ring frame machine: TOYOTO (RX- 10).
News
2020
Productivity and Economic Analysis
https://www.textileworld.com/textile-world/weaving-spinning/2020/10/productive-spinning-with-high-short-fiber-content/
2019
Study of the Effects of Number of Sliver Doubling in Draw Frame Sliver, Roving
and Carded Yarn Quality
Abdella Simegnaw
Bahir Dar University, Ethiopian Institute of Textile and Fashion Technology (EITEX),
International Journal on Textile Engineering and Processes
Vol. 5, Issue 3, July 2019
https://www.researchgate.net/publication/341726167_Study_of_the_Effects_of_Number_of_Sliver_Doubling_in_Draw_Frame_Sliver_Roving_and_Carded_Yarn_Quality/link/5ed0bee145851529451b7a60/download
2018
Yarn Manufacturing Process
https://www.slideshare.net/prafullnik/yarn-manufacturing-process-drawframe
RSB-D 50 DRAW FRAME – A NEW DIMENSION IN PRODUCTIVITY, QUALITY AND OPERATION
Jun 26, 2018
https://textilevaluechain.in/in-depth-analysis/articles/textile-articles/rsb-d-50-draw-frame-a-new-dimension-in-productivity-quality-and-operation/
Process Control in Drawframe
http://textilesworldwide.blogspot.com/2018/07/process-control-in-draw-frame.html
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