khadi yarn faults. figure of the fault definitioncausesremedy undrafted and untwisted roving present...
TRANSCRIPT
KHADI YARN FAULTS
Figure of the
fault
Definition Causes Remedy
Undrafted and
untwisted
roving present
in the yarn
Broken gear
tooth.
Damaged cots
of top roller.
Insufficient
pressure on the
top roller.
Proper
maintenance.
Buffing of cots.
Pote
Moree
Figure of the
fault
Definition Causes Remedy
Improperly
joined broken
ends.
Improper
piecing present in
sliver or roving.
Improper
piecing by the
charkha operator.
Training to the
operator about
piecing and its
importance.
Bakar
Figure of the
fault
Definition Causes Remedy
Trash (mainly
seed coats)
present in the
yarn structure.
Improper
ginning i.e. seeds
broken during
ginning.
Presence of too
much trash in
cotton fibre.
Insufficient
cleaning in blow
room.
Good ginning
practice.
Selection of
proper cotton
variety.
Proper cleaning
in blow room.
Over Twisted Yarn
Figure of the
fault
Definition Causes Remedy
Presence of
excessive twist
in yarn
segments.
Wrong selection
of twist wheel.
Wrong selection
of spindle driving
pulley.
The yarn count
has become
coarser.
Suitable action
to overcome these
difficulties.
Soft Twisted Yarn
Figure of the
fault
Definition Causes Remedy
It is the yarn
portion having
less twist than
the normal.
Wrong selection
of twist wheel.
Wrong selection
of spindle driving
pulley.
Cord slippage
on spindle wharve
Select proper
twist wheel.
Check spindle
slippage at
regular intervals.
Daghi
Figure of the
fault
Definition Causes Remedy
Oil or stain
marks
present on
the yarn.
Over flowing of oil
from spindle bolster.
Excessive oil on
ring with the
intention of running
the traveller
smoothly.
Improper storage
of material.
Improper material
handling.
Proper oiling
and greasing.
Proper material
storage.
Proper material
handling
Slub
Figure of the fault
Definition Causes Remedy
Thick places
having length
of 1 to 4 cm
and about 5 to
8 times larger
than the
average yarn
diameter at
the thickest
portion.
Poor
individualization
of fibres at the
card.
Lack of
adequate fibre
control in the
drafting region.
Better opening
and cleaning in
blow room and
card.
Replace
defective aprons.
Adjust setting.
Adjust top
roller pressure.
Excessive
roving twist