This slide is directly focus on SNAP STUDY IN WEAVING.

1. SNAPSTUDY
Submitted By: -
Mr. AMAN
PANDEY
greataman22@gmail.com

2. Snap study/reading is a technique that helps
both in listing in the various causes of loss in
efficiency and in estimating the percentage
loss due to each cause. When sufficient round
are taken, data for all the readings are put into
a table.

3. SNAP STUDY IN WEAVING
 For taking a snap reading one walks down the loom alleys
making tally of loom that are stopped against a list of
causes of stoppage, the recording of the incidence should
be spontaneous, the person taking snap readings should
not anticipate and incident stoppage.
 When sufficient round are taken, data for all the readings
are put into a table. The total number of looms found
stopped during the round expressed as percentage of all
loom inspected is a good measure of loss of loom
efficiency.

4. EXAMPLE
In a shed of 1000 looms, after taking 20 rounds of snap
reading and if 5000 are found stopped, the loss in
efficiency would be-
 ἠ = (5000) / (20*1000)*100
= 25%
If out of 5000 stopped loom, 1600 loom are found
stopped due to end breaks and warp falls, the loss in
efficiency due to end breaks and warp falls will be 8%.
Similarly loss in efficiency due to other causes can be
calculated.

5. This analysis will help immensely in taking corrective actions.
For making the more effective each mill should evolve norms
for various causes which result in loss of efficiency.
The minimum rounds required can be calculated from the
following relationship
R = K*E*(100-E)/ND2
Where,
R = number of snap rounds
K = constant (9 for 99.7% confidence and 4 for 95% confidence)
D = % error in estimation of efficiency (can be taken 1)
E = expected efficiency level
N = number of looms or machine

6. Snap study is done by studying these:-
1. Routine Studies 2. Special studies
 ROUTINE STUDIES
• End breaks and operations
Warp and weft breakage studies should be conducted once a month
for each count. The breaks should be noted case wise.
• Efficiency
Loom-shed efficiency should be studied every day by conducting
a snap round the department.

7. • Fabric defects
A snap round should be taken every day in the department for
observing fabric defects. The number of rounds should be
increased to 2-3 per day when the defects are excessive. While
observing the loom for the incidence of fabric defects, the type
of defect should be noted on an observation sheet.
•Speed checking
Loom speeds should be checked at least once a month. The
procedure to be followed is to rest a finger on the picking shaft
of a loom and count the strokes for two minutes.
•Hard waste
The hard waste level is to be calculated every month from
records. This will show the general trend.

8. •Transfer failures
•Colored weft shade
•Ordinary looms working with one shuttle
•Functioning of Warp stop motion
•Survey of ejected pirns on automatic loom
•Sortwise efficiency
•Maintenance audit
•Life estimation of stores items
•Productivity
•Stores consumption
•Labor employment
•Fabric inspection
•Packing and baling inspection

9. SPECIAL STUDIES
• Hard waste
Whenever required, detailed cause wise hard waste studies
should be conducted to pin-point the areas responsible for
excessive hard waste.
• Yarn content on weft pirn
In the event of any problem regarding weft supply, yarn content of
pirns should be checked either by measuring length of yarn on a few
pirns individually or by checking the pirn doff weights. In the case of
direct weft, count and yarn properties may also be checked.

10. Analysis of Loss in Loomshed efficiency by Snap Study:-