The main task of the roving process is to lengthen and thin the cooked sliver provided by the drawing process according to a certain draft multiple, improve the parallel straightness of the fiber, add appropriate twist, and wind it into shape for the next process. Storage, transportation and use of the process. The quality of roving directly affects the quality of yarn in the next process. Today, the editor will share the causes of several common roving process defects and their solutions.
01 The roving weight is substandard
Cause:
① The weight of the cooked strips fed is incorrect;
② The number of teeth of the draft conversion gear is wrong.
Solution:
① Control the weight of the cooked strips in the front line and strengthen inspection to ensure accurate feeding of the cooked strips;
② Correct the drafting change gear of the upper machine Strengthen inspections.
02 The strips are uneven and have serious rough details
Causes:
① Roller pressurization failure and improper roller spacing , the roller bends eccentrically;
② The rubber roller is concave, surface damaged, unable to rotate properly, and skewed;
③ The roller is wrapped, the rubber roller is wrapped, and the drafting transmission parts are abnormal;
④ The apron jaws are too tight;
⑤ Some drafting configurations are improper;
⑥ The roving twist is improper;
⑦ Workshop relative Humidity is too low.
Solutions:
① Correctly design the process;
② Strengthen the maintenance of drafting components;
③ Correct twisting;
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④ Prevent accidental drafting;
⑤ Pay attention to controlling the temperature and humidity of the workshop;
⑥ Control the quality of the front cooked strips.
03 Loose yarn and rotten yarn
Causes:
① Poor drafting performance of raw materials;
② The winding tension is too small and the winding density is insufficient;
③ The twist coefficient is too small.
Solutions:
① Correctly select raw materials;
② Increase winding density and winding tension;
③ Increase Twist coefficient.
04 Shoulder loss
Causes:
①Improper configuration of forming angle gear;
②Replace The directional mechanism fails and the forming mechanism components are poorly coordinated;
③ The roving tension is improperly controlled.
Solutions:
① Correctly replace the forming angle gear;
② Strengthen the maintenance of reversing and forming mechanisms;
③ Stabilize the roving tension.
05 Head and foot popping up
Causes:
① The height of the spindle wing or pressure palm is different;
② The stroke of the lifting ribs is too long or too high or too low, and the heights of the lifting ribs are different;
③ The spindle wing (rod) and bobbin gear jump.
Solutions:
① Unify the height of the winding parts;
② Ensure the spindle wing (rod) and bobbin transmission gear run smoothly;
③ Correctly design and adjust the movement of the lifting beam.
06 The entire roving winding machine is too tight
Causes:
① Improper configuration of forming and lifting conversion gears;
② The tension of the iron cannon belt is loose or the displacement is incorrect;
③ The twist of the roving is too large or too small, and the temperature and humidity are inappropriate.
Solutions:
① Correctly design and exchange the forming and lifting conversion gears;
② Tension the cannon belt and replace the winding gear to make the cannon belt The tension is appropriate;
③ Adjust the roving twist and control the temperature and humidity.
07 Flying flowers are attached
Causes:
① The feeding sliver itself contains flying flowers or the flying flowers fall into the cotton sliver ;
② If the cleaning work is careless, defects or flying flowers are attached to the roving;
③ The processing channel is not smooth and there is usually fiber accumulation.
Solutions:
① Strengthen front cleaning work;
② Seriously implement cleaning work specifications;
③ Strengthen tampon passage clean.
08 Oil-stained roving
Causes:
① Improper oiling of lubricating parts and oil overflow;
② When repairing flat cars and wiper machines, careless touching of cotton slivers and rovings occurs;
③ The working place is unclean with oil stains.
Solutions:
① Strengthen the sense of responsibility in flat cars, wiping cars, repairing machines, and refueling;
② Do a good job in cleaning the work area. </p
