First, raw materials
1, using cotton as a raw material, spinning prone aprons folder, because the fiber length is longer, less short fiber, the spinning draft is not easy to open, resulting in a too big burden drafting zone;
2, blended varieties, using fine denier polyester fiber polyester (0.8 denier), because the fiber is longer, in good order, the number of fibers per unit area more strongly increased in the drafting zone is not easy to draw too easily lead to a hard head, folder apron;
3, such as blends of these two varieties is also the fiber, the more vulnerable folder apron phenomenon.
Solution: You can magnify appropriate before spinning in the back roller gauge, the roller diameter Φ25mm, the former can be as between 17 ~ 18mm, the rear can be between 34 ~ 35mm; diameter Φ27mm, the former invariant, the post should be put to the 32mm, back draft multiples can be slightly enlarged.
Second, the process
A roving quantitative heavier, larger twist factor, resulting in the posterior region untwisting not spinning, drawing is not open;
2, spinning back draft multiples too small, resulting in the former district draft ratio is too large, the draft does not open;
3, yarn spacing block is too small, excessive pressure on the upper and lower jaws Shaw, resulting draft is not open.
Solution: ① in the process design note roving quantitative, can put a little small, but some manufacturers spinning zone after the installation of a pressure bar or double apron drafting, increasing the back draft multiple of roving twist coefficient appropriate amplification; ② appropriate to reduce the roving twist factor, lower spinning untwisting difficult, but should not affect spinning roving breakage, do not produce unexpected draft, back draft appropriate amplification factor, blended yarn can be put to 1.25, cotton Yarn can be put to 1.145, can not be too large, too easily lead to deterioration of dry and appropriate amplification spinning gauge block thickness appropriate to enlarge the roller gauge before.
Third, the device
1, the spinning tension torsion torque is too small, the tension is not enough, the next folder apron apron relaxation causes;
2, before the roller gauge yarn is too small, resulting in lower apron touch the front roller, friction increases, aprons operation blocked, turn ineffective cause;
3, using the new yarn under Shaw, due to increased surface pressure and upper Shaw, front roller and the front roller nip pressure consisting of the same, but the upper and lower jaws consisting Shaw pressure increases, resulting in Spinning Draft not open, easy folder apron.
Solution: ① appropriately increased tension torsion torque, increase apron tension; ② appropriate amplification before the roller gauge, blended 17 ~ 18mm, preferably 18mm, wear resistant bottom apron can be used, the cycle can be shortened ; pure cotton yarn for 17 ~ 17.5mm, spinning cradle pressure is not too large, can be between 14 ~ 16kg (Double Din), to compensate for the roller gap before enlargement brings evenness loss can be on Shaw Shaw forward setting the position 3 ~ 5mm, the amount of front roller downfield 4 ~ 5mm can be placed between the forward setting.
Fourth, air conditioning
Spinning temperature and humidity through the large, aprons moisture, surface hair stagnation, friction increases, resulting in ineffective rotation, playing Dayton, in addition to high humidity, roving also easy to absorb moisture, causing difficulty in drawing a direct result folder apron.
Solution: spinning temperature and humidity should be controlled at a relative humidity between 56 to 60, so that the apron and rovings are in excellent moisture absorption and desorption state. |
