Production in Drawframe:
Draw frame is a part of the yarn manufacturing process in which slivers pass through pairs of rollers and get some elongation, draft, doubled, and drawn. That’s why it ensures more straight, more combination, and more uniformity of yarns. Dust removal is also like a four subject of this draw frame stage. In this article, we will discuss production in a draw frame.
Technical specifications of an ideal draw frame:
- Delivery speeds should up to 800
- Production per delivery ( kg/hr) should up to 300
- The number of head per machine should 1-2
- Delivery per machine should 1 or 2
- Doubling per machine should 4-8
- The maximum feed weight(kg) should 55
- Delivery hank (ktex) should 3-7
- Waste,in % should 0.5-1
How to Find Out Production in Drawframe
Problem: 01
A conventional draw frame with a 1.125 diameter front roller and running at 400 rpm suffers 20% stoppages while per delivery 0.14 hank sliver. Find the machine’s actual production per delivery per shift of 8 hours?
Solution:
Surface speed of front roller = [ (π x Dia. x 400 ) ÷ 36 ] yards per minute
= [ ( 3.1416 x 1.125 x 400) ÷ 36 ] yards per minute
= 39.2857 yards per minute
Total yards delivery by each delivery is 8 hours with 20% stops,
= 39.2857 x [ (60 x 8 x 80 ) ÷ 100 ]
So Actual per delivery per shift production = 39.2857 x [ (60 x 8 x 80 ) ÷ (100 x 840 x 0.14) ]
= 128.2 pounds (ANS.)
You may like also: Useful Formulas for Spinning (Blow room, Carding and Draw frame)
Problem: 02
A draw frame having 1.25 front roller diameter makes 280 revolutions while producing a sliver of 0.15 hank. Find the production in hanks as well as in lbs. per delivery per shift of 8 hours given that the total time lost is 40 minutes?
Solution:
As we know the surface speed of roller = [ (π x Dia. X 400 ) ÷ 36 ] yards per minute
So 100% production in hanks = [ 3.1416 x 1.25 x ( 280/36 ) x{ ( 60 x 8 ) / 840 } ]
Actual production in hanks = [ 3.1416 x 1.25 x ( 280/36 ) x ( 440 / 840 ) ]
= 16 (approx.).
Actual production in pounds = [ 16 hanks / 0.15 hanks sliver ]
= 106.6 (ANS.)