2. Mathmatical law:
• Production = πDN inch / min
• Production = Nip/min X Feed/Nip X No. of head X Waste% X Eff.%
• Production per day,
100-Noil%
= Nip/min X Feed/nip X No. of head X Feed lap weight X Efficiency X …..…………. X 60 X 24
100
• Mechanical draft =
draft constant
𝐷𝐶𝑃
Feed sliver weight
• Actual draft = ………………………… X Doubling
Delivered sliver weight
•
Actual draft = (Mechanical draft X 100) / (100 –Waste%)
• Production constant = Circumference speed of coiler calendar roller / 36
3. 1. In a combing machine coiler calendar roller speed
is 118 rpm, radius 1”, Delivered sliver weight per yd is
46.6 grain. Calculate the production constant. If
efficiency is 90% then also calculate the production
per shift.
Ans : Production constant = 20.58
Production/shift= 59.20 lb/shift
4. 2. Ribbon/feed lap weight per yd 580 grain. 6 laps
are feeded in a combing machine .
If delivered sliver weight per yds is 46.60 grain,
then what will be the ribbon lap hank and draft?
Ans: Ribbon lap hank= 0.0144
Actual draft= 74.68
5. 3. If in a combing machine draft constant is 2780 and
DCP is 46, then what will be the mechanical draft of
the machine?
If waste is 18%, then what will be the actual draft?
Ans: 60.43
73.70
6. 4. Calculate the DCP of a combing machine from
these parameters. Feed lap hank = 64 KTex,
Delivered single sliver hank = 3.40 KTex,
Doubling = 6,Waste = 15%, and draft constant =
1696.The machine is giving twine sliver delivery.
Ans: 35T
7. 5. Calculate the production for 8 hrs of a combing
machine from the following data –
Feed/Nip = 6.7 mm
Waste = 16%
Nip/min = 120
Efficiency = 90%
No. of head = 6 Feed
lap hank = 68 Ktex
A ns: 119.04 kg/8hrs
8. 6. Calculate the production per day of a combing
machine when,
Nip/min = 220
No. of head = 8
Feed/nip = 7mm
Lap weight = 1000 grains/yd
Efficiency = 90% & Noil = 15%
Ans: 2113.31 lbs
9. 7. If the hank = 60 ktex,
sliver hank = 5 ktex,
a six head comber used
what is the draft or actual draft ?
Ans: 72
10. 8. For a comber machine, which is
6 head comber
Sliver delivered in cans = 1
The linear density = 68 ktex
Sliver hank = 3.54
What is the actual draft ?
Ans: 57.7
11. 9. If the data in comber is:
Feed/nip = 6.7 mm
Sliver nip = 324 mm
Then what is the mechanical draft
?
Ans: 48.5
12. 10. if for a six head comber m/c , twin slivers of 3.4 ktex
is required,
Head is six head comber
Feed lap = 64 ktex
Draft constant = 1696
Waste extraction = 15%
Dcp = ?
Ans: 36
13. 11.The sliver delivered by a comber is of 3.4
ktex & the dcp is 35
What is the dcp if the required output sliver
had to be 3 ktex ?
Ans: 31
14. 12. Find out the no of comber m/c to produce 10000 lb/day of
40 count semi combed [50:50] yarns when:
Nips/min = 380
Feed/nip = 5 mm
Lap wt = 1000 grains/yd
No of head/ frame = 8
Noil % = 15 %
Efficiency = 90 %
Ans: 4
15. 13. Find out production if nips/min & feed/nips
are
360 & 5.5 mm
Assume the parameters .
16. 14. Find out the production/shift/comber machine
in kgs
( assume necessary parameter)
15. Find out the total draft required to produce a
comber lap ( assume necessary parameter)
