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.
|
Parameter
|
High speed drafting
|
High draft ratio
|
High speed drafting with high
draft ratio
|
|
Front roller speed or
Delivery rate
|
increases
|
remains same
|
increases
|
|
Feed hank
|
remains same
|
decreases
|
decreases
|
|
Surface velocity of apron
|
Increases
|
decreases
|
remains same
|
|
Surface velocity of Front top cot
|
increases
|
remains same
|
increases
|
|
Front zone Draft
|
remains constant
|
increases
|
increases
|
Case Study 1 Mills normal
parameter to spun 100s Ne:
|
Make of RF
|
LR 6
|
Material Processed
|
100% Cotton
|
|
Drafting type
|
P 3-1
|
Fibre Length / Denier
|
35.5
|
|
Blend ratio
|
N/A
|
Total draft
|
35.71
|
|
Dyed / grey
|
N/A
|
Break Draft
|
1.136
|
|
Yarn Count In Ne
|
100s Cwd
|
Spindle speed
|
19000
|
|
Roving hank
|
2.8
|
FRS
|
12.46 Mts / Min
|
|
Roving TM
|
1.12
|
RF - TM
|
3.8
|
|
Parameter
|
Normal
|
High speed
drafting
|
High draft ratio
|
High speed drafting with high
draft ratio
|
|
Front roller speed or Delivery rate mts /min
|
12.46
|
16
|
12.46
|
16
|
|
Feed hank
|
2.8
|
2.8
|
2.0
|
2.0
|
|
Delivery hank
|
100s
|
100s
|
100s
|
100s
|
|
Surface velocity of apron in mts/min
|
0.396
|
0.509
|
0.283
|
0.396
|
|
Surface velocity of Front top cot
|
12.46
|
16
|
12.46
|
16
|
|
Front zone Draft
|
31.43
|
31.43
|
44
|
44
|
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