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High speed drafting of textile material with high draft ratio and its impact on cots and aprons at ring spinning machines
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By
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B. Sujai
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High speed drafting with high draft ratio:
Increasing the delivery speed or productivity of a spinning
machine and the same time reducing the feed hank from finer side to courser
side will proportionately increase both the speed of drafting and also draft
ratio.
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Parameter
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High speed drafting
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High draft ratio
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High speed drafting with high
draft ratio
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Front roller speed or
Delivery rate
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increases
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remains same
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increases
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Feed hank
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remains same
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decreases
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decreases
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Surface velocity of apron
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Increases
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decreases
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remains same
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Surface velocity of Front top cot
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increases
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remains same
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increases
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Front zone Draft
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remains constant
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increases
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increases
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Case Study 1 Mills normal
parameter to spun 100s Ne:
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Make of RF
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LR 6
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Material Processed
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100% Cotton
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Drafting type
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P 3-1
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Fibre Length / Denier
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35.5
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Blend ratio
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N/A
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Total draft
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35.71
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Dyed / grey
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N/A
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Break Draft
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1.136
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Yarn Count In Ne
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100s Cwd
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Spindle speed
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19000
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Roving hank
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2.8
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FRS
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12.46 Mts / Min
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Roving TM
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1.12
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RF - TM
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3.8
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Parameter
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Normal
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High speed
drafting
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High draft ratio
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High speed drafting with high
draft ratio
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Front roller speed or Delivery rate mts /min
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12.46
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16
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12.46
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16
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Feed hank
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2.8
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2.8
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2.0
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2.0
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Delivery hank
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100s
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100s
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100s
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100s
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Surface velocity of apron in mts/min
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0.396
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0.509
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0.283
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0.396
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Surface velocity of Front top cot
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12.46
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16
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12.46
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16
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Front zone Draft
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31.43
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31.43
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44
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44
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