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Process Control in Warping-1
Process Control in Warping
Warping is the process of winding together on a beam a specified
number of warp ends from
Creel. The creel is a convenient rack for holding spools, cones
or cheeses while the yarn iswithdrawn to the warp beam.
The following are the process control parameters in a warping
department:
1. Minimising End breaks.
2. Quality of warping beam3. Control of productivity
Importance of Minimising end breaks:
The stoppage of the machine due to an end break is likely to
deteriorate the quality of the beamdue to three reasons:
1. The rubbing of the beam by the drum which stops abruptly.2.
Owing to the difficulty in finding the broken end, there is a
possibility of incorrect mending. It
may lead to lappers during sizing.
3. There is some loss in the extensibility of broken end when
the machine is stopped, it increasesthe probability of breakage in
weaving and sizing.
The following points should be noted to improve the quality of
warping beams:
1. condition of beam flanges:
If the beam flanges are damaged, the unwinding of yarn near the
flanges will not be satisfactory.This will cause difficulties in
sizing and weaving.
2. Stop Motions and Breaks:
Proper stopping of the warping machine after an end break
ensures that the broken end on the
beam can be traced easily.
3. condition of the driving drum:
On most warping machines the beam is driven by fricitonal
contact with the driving drum. In
order to get a package of the correct density, the pressure
between the drum and the warper'sbeam has to be kept at fairly high
level.
4. Barrel Diameter of the Beam
Beams of small barrel diameter give rise to high unwinding
tension at sizing, particularly when
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