Subject Name: Production Planning & Maintenance
Time: 10:30 AM TO 01:00 PM
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1
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In a weaving unit 40 projectile looms are running with following quality of fabrics.
Fabric Details:
R.S.: 56” Reed count: 80s
Length contraction: 5% Warp/Weft: 2/80sNe / 50s Ne
Ends/dent: 2 GSM: 160
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Loom RPM: 320 Loom Effi.(%) : 89
Loom width: 130”
Calculate how many warp beams will be required per week for the above shed if maximum length of yarn on a beam is 3000 m (ignore selvedge during calculation) [09]
Calculate the time after which all cans will be exhausted on draw frame from following data. [05]
Doublings: 8 DF Speed: 450 mpm
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DF Efficiency: 85% Count of sliver: 4.1 ktex
Wt. of sliver in one can: 27.8 Ibs Draft: 8
A fabric is to be produced having 40 inch Reed Space. The fabric has a weft way stripe of 50 threads per repeat comprising of 10 dark threads and 40 white threads. Find out requirement of dark and white weft yarn per 100 linear m of fabric. The PPI-are 60.Count of the weft yarn is 2/80s Ne. [07]
Calculate how many times warping creel needs to be changed from following data. [07]
Maximum length on warper’s beam : 20000 yds
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Length of yarn on weaver’s beam : 2000 yds
No. of ends'in weaver’s beam : 5328
No. of weaver’s beams required : 20
Count of yarn : 50s Ne
No. of threads in warping creel : 592
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Wt. of yarn on package : 1.75 kg
OR
A mill wants to produce 8000 m of a particular fabric every day. Calculate number of bobbins required from winding and pirn winding departments from following details. [07]
R.S.:45” EPI: 80 Weight of fabric: 175 gsm
Count : 40s / 34s Ne
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Length of yarn on wound bobbin : 70000 m
Winding speed/eff. : 1100 mpm / 85%
Pirn winding speed/eff. : 500 ypm / 75%
Length contraction : 6%
Weight of yarn on pirn : 1.2 ozs
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION - WINTER 2018
Subject Code: 172903 Date: 19/11/2018
Total Marks: 70
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Q.3
Loom no. Pick Counter Reading RPM PPI
Start End
1 10312 31696 98 90
2 09834 32514 210 80
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3 18979 42739 220 52
Write all maintenance check points for winding and ordinary plain power loom. [07]
OR
Weaving department has following types of looms and the fabric varieties to be produced on particular loom. Calculate total requirement of yarn.(Assume 6 % contraction for each fabric) [10]
Loom details:
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Type of loom Max. R.S. RPM Eff. % No. of looms
1. Air jet 190 cm 650 90 24
2. Rapier 220 cm 500 90 24
3. Autoloom 56” 200 90 48
Fabric Details & Requirement:
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No. EPI/PPI R.S” Wp/ Wt Req.(m) To be woven on
1 80/52 42 34/34 35000 Autoloom
2 120/ 96 56 2/80/50 30000 Air jet
3 80/ 80 50 2/60/2/60 28000 Rapier
Q4
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Derive equation to work out length of yarn per weft bobbin, length of cloth produced per weft bobbin and no. of weft bobbins per loom per hour. [04]
What is the effect of change in PPI on number of weft bobbins required per hour? [04]
Write atleast five maintenance check points for carding machine [04]
An OE Spinning Plant has following requirement for a month (30 working days at 24 hrs per day) [10]
Count Requirement Rotor speed rpm eff.%
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9s 22,000 kgs 75000 95
Calculate no. of OE spindles required to produce above counts. Also calculate no. of cards required from following data.
Doffer dia:27” Doffer rpm: 35 Tension draft: 1.01
Count of sliver: 4.91 ktex Efficiency of Card : 85%
OR
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A texturising plant has following requirement per day: [07]
Count(Denier) Required Production in kg
75/36 1200
75/36/400 0800
Calculate no. of spindles required of SDS 600(94%efficiency) and of TFO (running at 13000 rpm and 91 % efficiency).
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There is a requirement of 300 kgs/day of 40s 100% cotton and 600 kgs/day of 54s PC blended (67:33)material. How many comber shifts required to cater requirement of material. Nips/min is 250 and feed/nip is 5 mm. Other data is as given below: [07]
Comber type Count lap wt.g/m noil % eff. %
Bicoiler 8 head 54s pc 68 15 90
Q.5 (a) Ring frame department of a spinning unit supplies following yarns (from same mixing) to a weaving unit per day: [10]
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Count Fibres Production in kg
32sK 100 % 500
40s C Cotton 600
Work out number of blow room laps required per hour from following data.
Lap roller speed: 5 mpm efficiency : 85%
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Count of lap : 490 g/m lap length : 40 yds
(assume waste% at all stages)
(b) Calculate the production of a ring frame from following data: [04]
Count : 42sNe
Spindles: 1008 Spindle speed/eff.% : 21000/85%
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OR
Q.5 (a) Calculate weight of doff, time after which doff is to be taken and time after which roving bobbin will be exhausted on ring frame from following data. [07]
Speed of RF: 15000 rpm Eff.: 87% Count of yarn: 42sNe
T™: 4.0 Wt. of roving bobbin: 3.5 lbs
Waste at RF: 2.5 % Count of roving: 0.59 ktex
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No. of spindles: 880 Length of yarn on ring bobbin: 4200 m
(b) Calculate time after which the lap will be exhausted on card from following data. [07]
Lap weight: 490 ktex Lap length: 40 yd Doffer dia.: 277
Doffer rpm: 30 Efficiency: 86 % Tension draft: 1.01
Draft at card: 100
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