Regular irregularity is distributed on the blackboard in oblique strip shape, commonly known as "oblique strip". The regular length is generally equal to the circumference of the front roller or the front cot, or greater than the circumference of the front roller. Reflected in the cloth surface presents "striped cloth", "Plaid" and other defects. Regular unevenness of strip usually has the following situations.
01
There are many problems in spinning frame or in a particular variety of yarn. The reasons are improper drafting process, too large total draft, too large or too small rear draft, improper gap between apron jaws or roller, insufficient roller pressure, improper temperature and humidity control, and poor semi-finished products (roving).
02
There are several main reasons for unevenness of strip in an area or adjacent machine.
1) poor temperature and humidity control in this area.
2) the quality fluctuation of Front Spinning fixed supply machine.
3) some process parameters of the machine (roller, jaw spacing and back draft, etc.) are inappropriate or misused.
4) the quality of cots and aprons in this area is poor.
03
Some machines are unevenly dried. The main reasons are as follows.
1) eccentric, bending or torsional vibration of roller.
2) excessive abrasion or poor engagement of draft drive gear.
3) the shaft and bearing of draft drive gear are worn out beyond the limit.
4) after the special number (number) is changed, the process parameters are omitted or mistaken.
5) the machine stops for too long or the roving is worn out after using for a long time.
6) the quality of the cots and aprons is not good.
04
Some or some spindles on the machine are unevenly dried. The main reason is that some parts wear out of limits or do not meet the specifications.
1) the feeding parts are poorly maintained or in disrepair (such as rough and rusty yarn guide rod, missing porcelain bowl and porcelain ring, damaged spindle and poor rotation, defective yarn guide horn, etc.).
2) deviation of guide yarn movement or deflection of individual guide yarn horn (regular coarse pitch is often formed).
3) caulking or impurities in the rear roller groove.
4) under pressure or failure of the rear rubber roll (decline or failure of the pressure spring of the cradle).
5) the rubber roll is not in normal operation (the rubber roll is eccentric, there are indentation on the surface, the rubber roll loses elasticity, the rubber roll bearing is lack of oil or the roller is seriously worn, and the specifications of the same rubber roll are not the same as those of the shift rubber roll, etc.).
6) the rubber ring fails to rotate or falters (including uneven elasticity, hardening, crack, deviation or lack of oil and wear of middle and upper rollers).
7) the self-adjusting center function of the cradle is out of order and the "three straight lines" position of the cot is not correct.
