Spin plan for the spinning mill. Here the calculation is done for 80s Ne combed cotton yarn. for carded yarn, the calculation for comber and lap former is not needed.

1. Khulna University of Engineering and Technology
Course No: TE 3201
Course Title: Yarn Manufacturing Engineering-II
Assignment on Spin Plan for 80s
(Ne) Cotton Yarn
Prepared by
Swaraz Mollick
Roll: 1421008
Student of Dept. of Textile Engineering
Third Year Second Term

2. Problem # Spin plan for a cotton mill (For 80s
Ne combed yarn)
1) Ring frame:
Total no of spindles = 25000
Spindles/frame = 480
Spindle speed = 18000 rpm
Yarn count = 80s
(Ne)
TPI = 27
Waste = 2.5%
Efficiency = 90%
Average stoppage time = 5%
Solution:
Required ring frame = ⁄ = 52.08 ≈ 52 for (52x480) 24960 spindles
No of running spindles =
= 23712
Production/hr =
=
= 352.86 lb
2) Simplex:
Spindle speed = 1600 rpm
Spindles/frame = 120
Roving hank (for 80s
count) = 3.5
TM = 1
TPI = 1√ = 1.87
Waste = 0.5%

3. Efficiency = 90%
Average stoppage time = 5%
Solution:
Total production of simplex = ring frame production x ( )
= ( )
= 361.68 lb
Production/hr/spindle =
=
= 0.44 lb
No of running spindles =
No of established spindles =
=
= 863.1 ≈ 863
No of simplex machine = ≈ 7
3) Comber
Feed/nip = 7mm
Nips/min = 300
Feed lap wt = 900 grains/yd
Feed lap hank = 0.0093
Delivery lap wt = 50 grains/yd
Delivery lap hank = 0.16
Noil = 16%
No of head = 8
Efficiency = 90%
Avg stoppage time = 5%

4. Solution:
Production in comber =
=
= 363.5 lb
Production/hr = (Feed/nip) X(nips/min) X Lap wt in grain X No of heads X Efficiency
=
= 127.14 lb
No of comber =
No of installed comber =
=
= 2.96 ≈ 3
4) Super lap former
Delivery speed = 90 m/min
Lap wt = 850 grains/yd
Lap hank = 0.0098
Efficiency = 90%
Waste = 2.5%
Avg stoppage time = 5%
Solution:
Production in super lap former =
=
= 421.66 lb
Production/hr =
=
= 625.5 lb

5. No of lap former =
No of installed lap former =
=
= 0.70 ≈ 1
5) Draw frame
Delivery roller speed = 400 yd/min
Sliver hank = 0.176
Delivery head/machine = 2
Waste = 0.75%
Efficiency = 90%
Avg stoppage time = 5%
Draft = 6
Doubling = 6
Solution:
Draw frame production = p o m p o on
=
= 432.2 lb
Production/hr/frame =
=
= 321.4 lb
Running draw frame =
Installed draw frame =
=
= 1.407 ≈ 2
D/F sl v h nk
𝐶𝑎𝑟𝑑 𝑠𝑙𝑖𝑣𝑒𝑟 𝑎𝑛𝑘 𝑋 𝐷𝑟𝑎𝑓𝑡
𝐷𝑜𝑢𝑏𝑙𝑖𝑛𝑔
=
𝑋
= 0.176

6. 6) Carding
Doffer Diameter = 27”
Doffer speed = 45 rpm
Sliver hank = 0.16
Efficiency = 90%
Waste = 5%
Avg stoppage time = 5%
Draft = 110
Solution:
Carding Production =
=
= 435.4 lb
Production/hr =
=
= 42.6 lb
Running carding machines =
Installed carding machines =
=
= 10.73 ≈ 11
7) Blow room
Bottom calendar roller diameter = 10”
Bottom calendar roller speed = 12 rpm
Lap wt = 12 oz/yd
Lap hank = 0.0016
Waste = 5%
Efficiency = 90%
Card sl v h nk Blow oom l p h nk X D
= 0.0016 X 110
= 0.176

7. Scutcher/Blow room line = 2
Avg stoppage time = 5%
Solution:
Production in Blowroom = n p o on
=
= 457.17 lb
Production/hr =
=
= 420.7 lb
Running scutchers =
Total scutchers =
=
= 1.15 ≈ 2
No of Blowroom line =
Summary:
No of required machine for 25000 spindles and 80s
(Ne) Cotton yarn:
1) Blowroom line = 1 (scutcher = 2)
2) Carding machine = 11
3) Drawframe = 2
4) Super lap former = 1
5) Comber = 3
6) Simplex = 7
7) Ring frame = 52

8. Yarn count = 80s
(Ne)
No of spindles = 25000
Parameters/
machine
Blowroom Carding Drawframe Super
lap
former
Comber Simplex Ring
frame
Hank/Count 0.0016 0.176 0.176 0.0098 0.16 3.5 80
Doubling 6 28
Drafting 110 6 1.56 16.32 21.87 22.85
Delivery speed
Or spindle
speed
12 rpm 45 rpm 400 yd/min
90
m/min
1600
rpm
1800
rpm
Delivery roller
dia
10” 27”
TM 1 3.01
TPI 1.87 27
Efficiency % 90 90 90 90 90 90 90
Ideal time % 5 5 5 5 5 5 5
Waste % 5 5 0.75 2.5 16 0.5 2.5
Delivery/frame
Or
Spindle/frame
2 2 8 110 480