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Calculation of Weaving Loom Efficiency

Calculation of Weaving Loom Efficiency
S. M. Hossen Uzzal
Production Officer
Monno Fabrics Ltd., Manikgonj
Email: uhossen@gmail.com




Loom Efficiency:
If we define loom efficiency then we can say that, the average number of picks per minute inserted by a loom expressed as a percentage of what is theoretically possible if the machine were running continuously.
Calculation of Weaving Loom Efficiency
Calculation of Weaving Loom Efficiency
Loom efficiency can be measured by the following formula:

                                         Actual Production
Loom Efficiency (%) = …………………………. X 100
                                       Calculated Production

A second approach, which gives the same answer, is to consider running times:

                                                Actual running time
Loom efficiency (%) = ……………………….......………. X 100
                                       Actual running time + stopped time

It is the stopped time that management try to minimize by appropriate choice of yarns, preparation of warp and weft, loom selection and maintenance, training of operatives , supervision, etc.

Example:
Find out the loom efficiency from the following data,
  • Loom speed = 180 picks/min
  • Repair of warp breaks per 100,000 picks = 20 occasions
  • Repair of weft breaks per 100,000 picks = 15 occasions
  • Other repairs with loom stopped per 100,000 picks = 6 occasions
  • Average warp-repair time = 0.85 min
  • Average weft-repair time = 0.30 min
  • Average time for other repairs = 0.12 min
Solution:
First, we want to find out the running time per 100,000 picks

Running time for 100,000 picks =100,000/loom speed

=100,000/180 = 555.5min

Stopped time for warp breaks = 20 x 0.85 =17 min

Stopped time for weft breaks = 15 x 0.30 = 4.5 min

Stopped time for other repairs = 6 x 0.12 = 0.72 min

Total time for machine stoppage = 17 + 4.5 + 0.72 = 22.22min

Total time to weave 100,000 picks =555.5 + 22.22 = 577.72 min

Hence, the loom efficiency:

                                                Actual running time
Loom efficiency (%) = ………..............………………………. X 100
                                      Actual running time + stopped time

          555.5
= ……...…....….. X 100
    555.5 + 22.22

= 96.16% (ANS)

This efficiency value does not take into account time lost for such matters as major mechanical breakdown, waiting for new warp and gaiting new warp, type new warp to old warp.

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