Downstream production line auxiliaries
Thickness measurement device: In the high-speed continuous production process, cast film thickness measurement must be non-contact automatic tracking. Most of the current use of radioisotopes such as beta ray or infrared radiation thickness gauge, thickness gauge in the third chapter has been described. The detector reciprocates transversely to measure the film thickness, comparing the target value with the true value, showing the deviation, positive and negative tolerances and the average value on the screen. Measured data can be automatically fed back to the computer for processing, processing automatically adjust the process conditions. However, the current manual or mainly to adjust the process parameters.
Tension measurement and vibration control: In the production of cast film, due to the delivery and coiling, the transmission system should be able to provide a constant torque, the use of SCR rectifier DC motor can achieve this requirement. One way to measure film tension is to measure the motor torque in direct proportion to the drag current of the motor, which is calculated from the armature current and from the armature voltage. The structure of the load cell controller is shown in Figure 7-14, which records the tension of the film in front of the towing unit and signals the control system. To avoid excessive tension during film transport, the web tension needs to be measured using a roller system or a roller in the load-sensing pick-up shaft. Before the product is cut and rewound, the film is vibrated in the direction of extrusion to change the width. Membrane movement path and vibration device can be horizontal and vertical installation. The vibrating device is located behind the thickness measuring device.
Slitting device: Extruded film as a result of "thin neck" (film width less than the width of the head) will make the edge of the film is too thick, it is necessary to remove the film edge, in order to ensure that the end of the film roll neat surface formation. Trimming the edge of the scrap material can be used to roll the machine into a tube, suction can also be used aspirated, where the trimming material is a cleaning material, can be directly sent to the crusher for recycling. Cast film width is very wide, the manufacturer must be based on user requirements cut the film into a certain size. There is a pre-towing device between the radial slitter and the towing device so that the tension required for the film to be cut and delivered is independent of the take-up tension.
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