Check the traction speed and control the film thickness.
Observe and adjust the uniformity of the film thickness, and ensure that the bending diameter meets the standard.
Check the pressure of the air storage cylinder, it should not be too high, but there should be a backup pressure.
Check and control the proportion of raw materials and mix them evenly.
Check for impurities in the raw materials, especially by promptly using a magnet to check for any iron mixed in.
Check the lubrication condition of the gearbox position and air compressor cylinder lubricating oil.
Regularly check the temperature rise and mechanical transmission of each operating motor.
Maintenance of blown film machine - targeted maintenance items
1. Feeding machine system: Clean the filter in a timely manner and check for any air leaks in the negative pressure feeding system.
2. Extruder system:
① Observe the pressure gauge and main motor current, and clean the screen changer in a timely manner
② Check for noise and overheating in the gearbox, screws, and main motor
③ Check the operating frequency, current, and temperature rise of the frequency converter, and clean the dust on the motor and frequency converter on time.
④ Correct the measurement error between thermocouple and actual temperature.
⑤ Correct the placement of the extruder, adjust the groove wheel to ensure that the extruder is placed at an angle and level.
3. Mold head system:
① The startup heating adopts a secondary heating method to avoid temperature overshoot.
② Before starting and stopping the machine, use a pure copper scraper to clean the accumulated material, paraffin to clean the membrane opening, and reduce the impact of precipitates on the membrane bubbles.
③ Cover the protective felt promptly after shutdown to avoid damage to the mold. (This method is used for the upper blower)
④ Regularly check the temperature and current of each temperature zone and membrane heating plug, and correct the temperature difference.
⑤ Correct the level of the mold head and match the center point with the traction.
⑥ Use a torque wrench to disassemble the mold screws, and operate according to the specified torque. Use molybdenum disulfide grease for the high-temperature parts of the screws.
⑦ Welding and cutting of molds are prohibited.
4. Wind ring maintenance: Clean up debris and dust inside the wind ring in a timely manner
5. Maintenance of traction device: The zigzag folding is pollution-free, the clamping traction (cooling) roller pressure is appropriate, there is no condensation water, and the flattening roller operates flexibly.
6. Maintenance of corona discharge processor:
① Regularly clean high-voltage transformers, discharge rollers, discharge racks, electrical control boxes, and adjust discharge clearances;
② Before starting up, check the humidity of the equipment to avoid short circuits in the discharge rack, and check the operating temperature of the discharge roller bearings,
③ Replace the silicone tubing in a timely manner.
7. Electrical maintenance
① Ensure the stability and reliability of the power supply, and ensure that the performance parameters meet the requirements,
② Maintain appropriate temperature and humidity, keep good grounding, and pay attention to eliminating static electricity hazards.
③ Regularly remove dust from the radiator.
④ It is prohibited to carry out repairs on core components.