Application of 6000S series inverter in film blowing and winding The film produced by the film blowing machine is suitable for various film packaging. This film can be widely used in light and heavy packaging due to its good barrier properties, freshness, moisture, frost, oxygen, and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid beverages, medical supplies, and even agricultural films. I. Overview The film produced by the film blowing machine is suitable for various film packaging. This film can be widely used in light and heavy packaging due to its good barrier properties, freshness, moisture, frost, oxygen, and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid beverages, medical supplies, and even agricultural films. The film blowing machine heats and melts the plastic particles and blows them into a film. The dried polyethylene particles enter the screw through the lower hopper, and then the plastic particles are pushed forward by the screw. During the process, due to the plastic and screw, plastic and barrel The friction between the particles and the collision and friction between the particles and the external heating of the barrel gradually melt. The die of the molten plastic head comes out, is cooled by the wind ring, and after inflation, passes through the herringbone baffle, and is pressed into a film by the traction roller and wound into a tube. The output speed of the film blowing machine can reach 20 ~ 100m/min, even up to 200m/min or more. The film produced by the multi-layer co-extrusion film blowing machine has the characteristics of high transparency, puncture resistance, high toughness, good low-temperature hot-cutting property, good compound fastness, and anti-curling property. 2. Working principle Film blowing machine is a device that melts and blows plastic particles into a film, which is mainly composed of film blowing and winding. The role of the winding part is to wind the blown film into a roll, and make the rolled film flat without wrinkles, neat curling, and the film on the reel should be moderately tight to prevent the film from stretching and deformation and ensure quality. Therefore, constant tension control must be used when winding. At present, the torque motor is mainly used in the industry to achieve the above control, but there are shortcomings that require manual adjustment during operation, the operation is inconvenient, the torque motor generates heat during long-term operation, the controller is relatively easy to damage, and the reliability is not high. . Introduction of film blowing machine winding process 1. Constant tension must be maintained throughout the winding process without manual adjustment; 2. When the empty roll is started, the tension should not be too large to prevent the film from wrinkling, and the tension should not be too small during the full disk operation to prevent the film from being taken up too loosely; 3. The system is responsive, and can be quickly adjusted according to the changes of pre-stage speed and tension during acceleration and deceleration to ensure constant tension; 4. It is required to quantify the tension, that is, the tension can be set according to the process requirements of different film production. 3. System configuration The main traction roller of this system adopts ALPHA6000 universal frequency converter, and the winding adopts ALPHA6000S vector frequency converter, and the system adopts open loop vector mode. Note: In order to prevent the rewinding and material breaking speed, the running frequency of the traction stick can be output as the frequency setting of rewinding. Four, system advantages 1. The system torque + speed mode is simple in structure and easy to operate, and the inverter displays torque adjustment value display intuitively; 2. Excellent blocking function can prevent the motor from burning due to blocking due to misreception. 3. The starting current is small, which impacts the power grid and mechanical equipment The output and drawing speed are stable, which greatly reduces the defect rate of the product and saves the production materials. 5. Adopt frequency conversion stepless speed control, plastic extrusion and stretching speed can be controlled at will, high production efficiency. 6. Built-in AVR automatic voltage stabilization function, plastic extrusion and stretching speed are not easily affected by input voltage fluctuations, ensuring product quality in the case of unstable grid voltage. 7. Strong protection function, the inverter has built-in multiple protection functions of over-voltage, over-current, under-voltage, overload, overheat and lack of equal.