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- DHP418 series polypropylene spinning and drafting machine
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Regular irregularities are distributed in diagonal stripes on the blackboard, commonly known as "slanted stripes". Its regular length is generally equivalent to the circumference of the front roller of the spun yarn or the rubber roller, or larger than the circumference of the front roller of the spun yarn. Reflected on the cloth surface are defective cloths such as "striped cloth" and "plaid cloth". Regular unevenness usually has the following situations.
Spinning machines commonly appear or uneven yarns of a particular type of yarn are caused by improper configuration of the drafting process of the yarn, the total draft is too large, the post draft is too large or too small, the aprons jaws or rollers Inappropriate distance, insufficient roller pressure, improper temperature and humidity control, and poor semi-finished products (rovings).
There are several reasons for unevenness in an area or a nearby machine.
1) Poor temperature and humidity control in this area.
2) The quality of the front spinning fixed supply machine fluctuates.
3) Some machine parameters (roller, jaw spacing, rear drafting, etc.) are inappropriate or used incorrectly.
4) The quality of the rubber rollers and aprons in this area is not good.
There are several reasons for unevenness in individual machines.
1) Roller eccentricity, bending or roller torsional vibration.
2) Excessive wear of the drafting transmission gear or poor meshing.
3) The shaft and bearing of the draft drive gear are worn out.
4) After changing the special number (count), the process parameters are missed or wrong.
5) The machine has been parked for too long or the roving has deteriorated over time.
6) The quality of the rubber roller and rubber ring is not good.
Partial or individual spindles appear uneven on the machine. The main reason is that some parts are worn out of tolerance or out of specification.
1) The feeding parts are poorly maintained or out of repair (such as rough and rusty yarn guide rods, lack of porcelain bowls and porcelain rings, failure of hanging spindles and rotation failure, and missing yarn guide horns, etc.).
2) The deviation of the yarn guide movement or the skew of individual yarn guide horns (often regular thick knots).
3) Back roller groove inlays or impurities.
4) The pressure of the rear rubber roller is under pressure or failure (decay or failure of the cradle compression spring).
5) The rubber roller is not running properly (eccentric rubber roller, indentation on the surface, rubber roller loses elasticity, the rubber roller bearing lacks oil or the roller is worn seriously, and the specifications of the rubber roller are inconsistent)
6) Poor rotation or frustration of the aprons (including uneven elasticity of the aprons, stiffness, cracks, deviation, or lack of oil and wear on the middle and upper rollers).
7) The function of the self-adjusting center of the cradle fails, and the "three straight" position of the rubber roller is incorrect.
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