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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII(NEW) EXAMINATION - SUMMER 2019
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Subject Code: 2182902 Date: 17/05/2019Subject Name: Process & Quality Control in Weaving
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Which loom mechanism/parts effect loom speed? Discuss any two in short. 03
(b) Calculate expected efficiency of a warping machine from following data: 04
Speed: 650 mpm Set length: 18000 m
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Yarn length on cheese: 54000 mNo. of ends/beam: 540 End breaks/400 ends/1000 m: 2.3
Time to mend a warp break: 38 sec Time to change a beam: 400 sec
Time to change a creel: 2000 sec
(c) Explain variable staggering of healds and asymmetric shedding tappets. 07
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Q.2 (a) Give equation to calculate operative efficiency. 03
(b) Following data is available from slub catcher: 04
No. of objectionable faults : 235 No. of knots put : 174
No. of objectionable faults removed by slub catcher : 65
Calculate clearing efficiency, knot factor and quality factor of the slub catcher.
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(c) Explain in detail various quality point about sizing beams. 07
OR
(c) Write in detail on stops on loom due to shuttle change and loss of efficiency due to same. 07
Q.3 (a) What are the control measures related with yarn content on pirn? 03
(b) Discuss on weft tension control in shuttle 04
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(c) Write a short note on effect of condition of machine on end breaks at warping. 07
OR
Q.3 (a) Give equation to calculate tension during unwinding of a bobbin. Also discuss effect of each parameter. 03
(b) Explain terms like clearing efficiency, knot factor, relative strength of splice and clearing curve. What is the importance of these terms? 04
(c) Discuss effect of depth of immersion roller, level of size paste and density of ends on average size pick up. 07
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Q.4 (a) What is recommended creel tension level for warping? Give value of tension and weight of discs for high speed warping for different count groups. 03
(b) List causes & remedies for patterning damage occurring on wound bobbins. 04
(c) Write a short note on hard waste control in weaving preparatory processes. 07
OR
Q.4 (a) Give sizing-weaving curve and hence discuss how optimum size pick up level is decided? 03
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(b) With sketch explain in short use of after waxing. How it helps in improving performance at sizing? 04
(c) Discuss causes and remedies for following defects: 07
(i) Weft Bar (ii) Weft Snarl
Q.5 (a) Write three points to control small weft loop (Phurkies) damage. 03
(b) What are the causes of tightness/slackness in shed connections? How ratio of front and back heald shaft lift is calculated? 04
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(c) Discuss in short what special care is required during weaving of Polyester Filament yarn as weft in shuttle looms? 07
OR
Q.5 (a) What are the effects of reed parameters on weaving performance? What is air space? 03
(b) What do you understand by smoothness of shedding in a loom? 04
(c) Write in detail on role of swell release mechanism in shuttle checking. 07
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