Warping
The parallel winding of
warp ends from many winding packages (cone or package (warp beam) on to a
common is called warping
Object of warping
The objects of warping are
to convert a predetermined number of single end packages, such as cones or cheeses
into a sheet of yarn of specified length& width. The individual ends in the
warp are uniformly spaced across its full width. The warp yarns comprise one of
the systems of yarns required to produce a woven fabric & also for warp
knitting. The objective at warping, as erroneously considered by many is not at
all to remove yarn faults, the breaks due to these being only incidental.
What warping should do
1. To form from a
predetermined single end packages, such as cones or cheeses, a continuous sheet,
of yarn of specified length and width.
2. The individual ends of
the sheet should be spaced uniformly across its full width.
3. The density of wound
yarn beam should be uniform across the width and from start to end of
4. All the ends in the
sheet should be wound at almost uniform tension winding the sheet
What warping should not Do
1. Attempts should not be
made to remove the yam faults during the process of warping the yam breaks
during warping should be as minimum as possible
2. Density of the beam
should be earn should be controlled not by increasing yam tension but by
adjusting the pressure roll on the beam case of spindle driven beam
3. The yams should not get
damaged during warping -this can happen if the drum surface is not smooth
and/or the parts in the yam path have cut marks
4. The yarn sheet or the
beam should not have faults, such as missing ends, cross ends, slack ends fluff
or wild yarn, high variation in tension between ends, damaged flangers etc that
will cause end break or defects at subsequent processes.
Importance of warping
1. Constructions of beam warp
yam
2. Constructions of a
parallel yarn sheet.
3. Modifying the faults of
yarn like thick & thin places, large knots etc.
4. Winding the predetermined
length of yarn
5. Combination of small
packages
6. Finding long length of
warp yam Accelerating the next process..
Requirements of warping
Requirements of warping
1. The tension of all
wound ends must be uniform & possibly constant during all the time of
withdrawal from supply package.
2. Warp yarn should not
impair the physical& mechanical properties of yarn.
3. The tension should be
moderate to allow the yarn complete retain its clastic property .
4. Predetermined length of
warping should be observed.
5. The production rate of
warp yarn should be high.
6. The surface of warp
yarn package must be cylindrical.
