Defect in Blow Room
Flowing defect in blow
room it’s given below
1. Uneven lap
2. Irregular lap
3. Soft lap
4. Conical lap
5. Barrel shaped lap
6. Licking lap
7. Defective Selvedge
8. Split lap
9. Dirty lap
Causes for defect in Blow Room
Important causes for defects in blow room are
given below
1. Causes for
Nep formation in Blow room.
A. Cotton with too high or low moisture.
B. Extremely fine cottons with high trash
content.
C. Reprocessing of laps and mixing of soft waste
D. Rough or blunt blades and bent pins on beaters
E. Narrow settings between the feeding roller or pedal and beater
F. Long curved and U-bends in conveyor pipe
lines.
G. Inappropriate ratio of fan to beater speed. Wider H. setting between stripping rail and beater blade
G. Inappropriate ratio of fan to beater speed. Wider H. setting between stripping rail and beater blade
2.Causes for Curly Cotton:
A. Grid bars setting too close to beater.
B. Hooked or bent pins on kirschner beater.
C. Too wide a setting of stripping rail .
D. Long and bent conveyor ducts with low fan
speed.
3. Causes for lap Licking:
A. Use of too much soft waste in mixing.
B. Too high fan speed, excessive beating.
C. Cotton is damp or departmental humidity is
high. D. Sticky nature of material
4. Causes for Conical Lap:
A. Improper functioning of pedals on one side
due to pedals being choked with dirt .
B. Air entering at one side from under the grid
bar of beater .
C. Defective beater blade at one side.
D. Uneven suction at the cages leaving to
deposition of more material on one side than another s.
E. Lap roller racks, calander roller not exerting
even pressure across the lap width *Cages may not be properly levelled
5. Causes for Soft Lap
Calendar pressure
inadequate duc to wear and tear of weighting mechanis
Prevent fault in Blow Room
Preventive
Action for Neps Formation:
For avoiding neps formation
it is necessary to select the cotton according to moisture content in the
cotton. In both cases if moisture content is less or more, our process will
become critical as quality of our end product depends upon raw material. If
cotton having more trash content then it s necessary to increase beating point
And this beating will directly affect our neps formation and neps formation
will be more Cotton mixing supervisor should take action that during mixing
soft waste and process lap not to be mix with fresh mixing This step is
necessary to avoid neps formation. As neps formation affect the quality of our
yam.
Preventive
Action for Curly Cotton:
For getting good quality
product it is necessary to keep trained staff for maintenance point of view.
There is a need of technical person who have full grip on their work. They
should check the setting of machine and to keep machine update to avoid the
problems. Machine setting must not be wide not so close to avoid curly cotton
problem.
Preventive
Action for Lap Licking:
In order to prevent from
lap licking it is necessary not to mix soft waste during mixing process. Avoid
sticky nature cotton as in case sticky nature cotton then as a preventive
action inside temperature of department is to be controlled. In this case low
relative humidity and high temperature is needed.