Analysis of the causes of poor forming of 14 types of packages
1. Overlapping packages
(1) What is an overlapping package?
Overlapping winding means that the yarn is At or near the same position, they fall together and wind together to form a strip winding. (2) The consequences of harmful overlapping bobbins on the unwinding process of subsequent processes: A. High-speed unwinding breakage due to decoupling! B. High-speed unwinding and breakage (adhesion) due to involvement (3) The usual anti-overlapping methods of self-winding machines are as follows:
Method 1. Usually the anti-overlapping mechanism is by reducing or increasing the groove barrel The rotation speed is used to disperse the possible overlapping winding, (the opening and closing time of the grooved drum motor is different from the time difference), thereby causing the grooved drum and the bobbin to slip and reduce the overlap of the yarn. Common models include Murata 7-2, 7-5, 7-7, 21C, Schlafhorst 138, 238, 338, Lorian, Qingdao SMARO and other models!
Method 2: This anti-overlapping mechanism uses a slight left-right swing of the bobbin cradle, that is, the pressure change range of the contact surface between the bobbin and the grooved cylinder, which causes the grooved cylinder and the bobbin to slip and cause the yarn to slip. Reduce overlap. Common models include early Savio and Qingdao ESPERO. Method 3: This anti-stacking mechanism realizes the anti-stacking of the bobbin by changing the number of groove turns of the groove barrel through program control. When using ordinary grooved cylinders, when the diameter of the cylinder is close to a multiple of the diameter of the grooved cylinder, it is easy for the cylinder to overlap. When using a grooved cylinder with a different number of groove turns, the diameter of the cylinder when the overlap occurs has a certain difference. The ring-changing groove The drum takes advantage of the different diameters of the drums when overlapping bands occur, effectively avoiding overlapping bands. Usually, the diameter of overlapping bands is much smaller when using a 2-turn grooved barrel than using a 2.5-turn grooved barrel. Common machines The model is Murata 21C.
When the above anti-overlapping mechanism is enabled on the automatic winding machine, the possibility of overlapping the winding bobbin will occur under normal circumstances. The rate is low. When the winding conditions of the bobbin are abnormal and the bobbin overlaps the winding phenomenon, the usual processing method is: (1. Optimize the acceleration and deceleration ratio of the grooved drum.
(Prevent overlapping and drying) winding setting); 2. Set to reduce the contact pressure between the bobbin and the trough (increase the balance air pressure of the cradle, the cradle The balance air pressure is inversely proportional to the contact pressure between the package and the trough; 3. The package cradle or chuck is not functioning properly; 4. Packages with oversized diameters may cause overlapping packages; 5. Moisture resurgence of spun yarn tubes or winding production environment. The humidity is too high; 6. Slightly increasing the winding tension will have a slight effect on reducing overlap. 2. Chrysanthemum core tube. Sub.
(1) What is a chrysanthemum core bobbin?
In the area where the package head is close to the bobbin, the yarn layer is squeezed and causes “chrysanthemum core”. It is caused by the outer yarn exerting greater pressure on the inner yarn.
(2) Several factors that produce chrysanthemum core tubes.
Varieties with softer yarn characteristics, thicker yarn counts, higher yarn moisture regain, higher yarn elasticity, rotor spinning, wool-proof yarn, etc. are more likely to occur. Chrysanthemum core (3) Causes and solutions of chrysanthemum core tube
A. When the tension is too small and the contact pressure is inappropriate, it is easy to occur. The above parameters need to be optimized; B. The bobbin eccentricity is serious and easy to occur. Replace the qualified bobbin; C. The contact surface between the bobbin and the grooved tube is poor. Please correct the relative position between the small end of the bobbin and the grooved tube. (If there is a certain gap between the left side of the contact surface between the bobbin and the grooved bobbin, the core of the bobbin after winding will be softer); D. Excessive increment during winding will also cause chrysanthemum core bobbins. 3. Raised edge bobbin (1) What is a convex edge bobbin?
The cause of the convex bobbin is that as the winding diameter of the bobbin increases, the corresponding contact pressure between the bobbin and the grooved bobbin increases, and the winding density of the yarn also increases, causing the inner yarn of the bobbin to When compressed, it bulges out from the sides.
(2) Causes and solutions of convex bobbins
A. Thick yarns, double-ply yarns, elastic yarns, and bulked yarns are prone to such poor forming phenomena; B . For the above elastic yarns, if the tension is too large and the contact pressure is too large, convex bobbins are prone to occur; C. You can try to use a tension and contact pressure gradually reducing device to solve the problem. 4. Tangled yarn layer package (1) The formation and harm of the random yarn layer
During the high-speed winding process of the package yarn, slight slippage occurs between the yarn layers, resulting in the occurrence of the random yarn layer. This kind of slight slipping phenomenon between yarn layers sometimes manifests itself as yarn adhesion in the package yarn during high-speed unwinding, resulting in end breakage.
(2) Causes and solutions to the messy yarn layer
A. Excessive suction static pressure may lead to a messy yarn layer on the package. Appropriately reduce the static pressure. For machines without suction motor inverters, it is recommended to install them!
B. The large suction nozzle touches the tube when tying knots. When the diameter of the small head is 120 mm, adjust the distance between the large suction nozzle and the bobbin to 5-6 mm, and repeat the knotting action several times in succession. Adjust the twisting quality and do a good job in single spindle maintenance! D. The contact pressure of the bobbin is too low. Appropriately increase the package contact pressure (note: the balance air pressure is inversely proportional to the package contact pressure) E. The overlapping yarn layer is loose. Adjust the ON and OFF time ratio F of the anti-overlapping motor. This may occur when the yarn is slippery, the moisture regain is small, or when the distance between the large suction nozzle and the bobbin is too small during knotting. Appropriately increase the package contact pressure and air humidity (65%-70%), and optimize the parallel distance and negative pressure between the large nozzle and the package!
G. The tension unexpectedly decreases or disappears in a short period of time. Repair, clean and clean the tension system. Strengthen on-site management!
H. The chuck bearing of the bobbin cradle is running poorly. Repair and clean the bobbin cradle chuck!
I. Yarns, brittle fibers and products with high friction coefficientYarns with high static buildup can cause problems. Optimize the vehicle speed, tension and cradle pressure, and appropriately increase the air humidity of the production environment!
J. Too high bobbin winding speed. Reduce the winding speed appropriately! 5. Cross-side (climbing head) bobbin (1) What is cross-side (climbing head) bobbin? The yarn is thrown out from the left or right end of the bobbin. See Figure (2) Causes and solutions of side-crossing (top-climbing) bobbins A. The contact pressure of the bobbin is too small, causing excessive slippage between the grooved drum and the package. Appropriately increase the bobbin contact pressure
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