Film slitting machine performance and characteristics:
After the aluminum foil has been printed and coated, it is required to carry out the post-press slitting on the slitting machine, cutting the large-volume semi-finished product into the required size, and the semi-finished product running on the slitting machine is a process of unwinding and winding. This process includes two parts of the machine's running speed control and tension control. The so-called tension is to pull the aluminum foil and roll it to the core according to the standard, must apply a certain tension to the aluminum foil and tension the traction force, in which the control force of the tension aluminum foil is the tension. Tension control refers to the ability to permanently control the tension of aluminum foil as it is transported on the equipment. This control must be effective for any operating speed of the machine, including the acceleration, deceleration, and uniform speed of the machine. Even in case of emergency stop, it has the ability to ensure that the aluminum foil does not produce any damage. The slitter tension control is basically manual tension control and automatic tension control. Manual tension control means that when the winding diameter changes to a certain stage during the winding or unwinding process, the operator adjusts the manual power supply device to achieve the purpose of tension control. Automatic tension control is a tension sensor that directly measures the actual tension value of the tape, and then converts the tension data into a tension signal and feeds it back to the tension controller. By comparing this signal with the preset tension value of the controller, the control signal is calculated. The automatic control execution unit makes the actual tension value and the preset tension value equal, so as to achieve the purpose of stabilizing the tension. The size of the equipment winding and unwinding tension directly affects the product yield, the tension is too large, the winding is too tight, the aluminum foil is easy to produce wrinkles, the tension is insufficient, and the aluminum foil is liable to produce a serious misalignment on the shaft and the shaft slips, resulting in the inability to Unwinding, and causing a large swing of the reel when cutting, affect the cutting quality, so the slitter must have a good tension detection system.
1. Slitting machine unwinding tension detection system: The tension sensor detects it is a direct detection of tension, and is tightly integrated with the machine, with a detection method of moving parts. Usually two sensors are used in pairs, and they are mounted on the end shafts on both sides of the detection guide roller. By detecting the applied load on both sides of the guide roller, the material belt will make the tension sensor's sensitive element produce displacement or deformation, so as to detect the actual tension value, and convert this tension data into a tension signal and feed it back to the tension controller.
2. Attenuation and tension compensation of rewinding and unwinding of slitting machine: It is generally believed that maintaining the tension of the aluminum foil when the aluminum foil is retracted and rewinded is conducive to the quality of the finished aluminum foil product. This is not the case. The best method is to increase the aluminum foil tension according to a certain rule as the diameter or weight of the roll increases, and the smaller the diameter weight, the lower the tension value. Due to the automatic tension control and manual tension control in the slitting operation. Manual tension control requires the operator to continuously adjust the weight of the masterbatch roll diameter.
The automatic tension control system is a pre-set tension attenuation value, which is attenuated according to the change of the material roll during the operation of the equipment. When setting the automatic tension operation, set the initial tension first and then set the tension attenuation value. Take the attenuation value of the unwinding of the cut aluminum foil as an example. The principle of setting is: the attenuation value of aluminum foil tension (%) is equal to the tension of the end of each roll of aluminum foil minus the initial tension and then divided by the initial tension, then the quotient is multiplied by 100%. In setting the automatic tension value should not be too large, otherwise the aluminum foil winding surface hardness, easy to appear alice phenomenon, but the tension must not be too small, too small can easily cause the rewinding body is too loose, the winding is not neatly run edge. Therefore, the quality of the retractable roll during the slitting operation of the aluminum foil is mainly affected by the change in the tension of the aluminum foil. It can be seen that the mastery of the retractable roll control system is the key to the quality.
In summary, when cutting medicinal aluminum foil, first select the advanced model, and pay attention to understand the characteristics of the tension and tension detection control system used in the equipment during operation, and make reasonable use of the aluminum foil material used. The tension and the attenuation of the tension in the retracting and unwinding process are compensated to achieve a soft start and soft stop of the device tension to prevent quality problems. During the slitting operation, attention should be paid to the change of the tension of the aluminum foil retracting and rewinding coil, because it is affected by the material quality, weight, thickness uniformity, slitting speed change, and these properties must be matched with the aluminum foil when setting the rewinding reel tension. adapt. In order to ensure the correct tension of rewinding and rewinding, the dynamic balance processing should be carried out under the condition that the tension detection roller of the retracting and unwinding mechanism should be higher than the maximum speed, and the surface should have enough wrap angles to provide accurate running tension. To ensure the stability of product quality.