Causes, countermeasures and effects on the quality of BOPP film slitting quality ---
(iv) Effect of film roll tightness on product quality
2. The volume is too loose:
1 Shift: Due to the looseness of the winding, the film roll is easy to move in series and shifts. If the degree is serious, it cannot be used.
2 Core-pulling: Due to the looseness of the winding, the film roll has serious end face misalignment near the paper tube during the loading or unloading or use process, commonly known as “core pulling”, which affects the appearance and use effect of the product.
3 The film wrinkles produced by the loosening of the rolls and the pit lines (stars) formed by the tightness of the inner pines affect the appearance quality and the use effect of the products to some extent.
4 Face wrinkles: Due to the looseness of the winding, the point support force of the end face of the film roll during the movement is reduced, and the fish scale-like end face wrinkles are easily generated.
5 Eccentricity: If the winding is too loose, the film roll will be eccentric (elliptical), and the unwinding tension will be uneven during the unwinding process, which will affect the use effect, especially the printing overprinting effect.
Slitting machine operation guide ---
3 job responsibilities
3.1 Slicing machine gear duties
3.1.1 Conscientiously abide by the rules and regulations of the company and the production department, and obey the leadership with the monitor.
3.1.2 Proper operation and use of equipment, strict compliance with safe operating procedures, and timely elimination of common faults.
3.1.3 According to the requirements of product quality standards, it is responsible for the quality, consumption, safety and task completion of the machine, and self-inspection and its records.
3.1.4 Responsible for guiding, supervising and managing the work of the machine personnel.
3.1.5 According to the maintenance requirements of the equipment, carefully carry out the maintenance work of the equipment.
3.1.6 Work with the machine personnel to do a good job of cleaning the equipment and the area of ??responsibility.
3.1.7 Carefully carry out the work of handover, and communicate and record the problems existing in the operation of the equipment.
3.1.8 Have the responsibility for care and maintenance of the auxiliary facilities (lighting, emergency lights, tables, chairs, shelves, etc.) belonging to the machine and surrounding.
3.1.9 Complete the other tasks assigned to the squad leader and the superior leader.
3.2 Slitting machine auxiliary duties
3.2.1 Conscientiously abide by the rules and regulations of the company and the production department, obey the management of the vehicle, and strictly abide by the safe operating procedures.
3.2.2 Carefully assist the gear shifter to adjust and troubleshoot the equipment, and timely carry out the sanitary cleaning work within the scope of the equipment responsibility area under its jurisdiction.
3.2.3 Do a good job in preparation before starting the machine, do a good job in paper and product handling, and do a good job in quality self-inspection.
3.2.4 Clean up waste paper, garbage, packaging materials and evacuate the production site in time; cut off the power and air supply of the machine and auxiliary facilities at the end of the work.
3.2.5 Receive raw and auxiliary materials according to the requirements of the gears and do the work and identification of the original and auxiliary materials.
Slitting machine parts ---
2. Attenuation and tension compensation of the tension of the rewinding and unwinding: It is generally believed that maintaining the constant tension of the aluminum foil during the rewinding and unwinding of the aluminum foil is beneficial to the apparent quality of the finished aluminum foil, but it is not. The best method is to increase the tension of the aluminum foil according to a certain rule as the diameter of the coil increases, and the smaller the diameter, the lower the tension value. There are automatic tension control and manual tension control during the slitting operation. The automatic tension control system is the leading set tension attenuation value, which is maintained throughout the winding process. The manual tension control requires the operator to continuously adjust the diameter of the master roll to meet the tension required for the aluminum foil during operation. When setting the automatic tension operation, set the initial tension before setting the tension attenuation value. Taking the setting of the slitting and unwinding attenuation value as an example, the setting principle is that the aluminum foil tension attenuation value (%) is equal to the tension at the end of winding of the aluminum foil minus the initial tension and then divided by the initial tension. Multiply by 100%. When setting the automatic tension value of the unwinding, it should not be too large, otherwise the aluminum foil winding surface has a large hardness and is prone to warping. But the tension should not be too small, too small and easy to cause the rewinding body to be too loose, and the winding is not neatly running. Therefore, the quality of the rewinding and unwinding during the aluminum foil slitting operation is mainly affected by the change of the tension of the aluminum foil. It can be seen that the mastery of the retracting and unwinding control system is the key to affecting the quality.
3. The change of speed during slitting affects the change of tension: When the speed is increased or decelerated, the speed of the main motor changes. Firstly, it causes the instantaneous change of the tension of the unwinding traction to the winding section of the aluminum foil, and it is necessary to slightly vibrate the aluminum foil after a period of time to gradually stabilize the tension. The instability of this tension is manifested in the fact that the finished roll is not well-wound, and the end face has unevenness, which affects the quality of the product.
Zhengzhou EAST IMPORT AND EXPORT co., ltd . ( a goulian group of company) a manufacturer and exporter for all kind of packaging machinery , like bopp tape coating machines, bopp tape slitting machines. Bopp tape core cutter, bopp tape core loader etc