The daily maintenance of the Dalian blown film unit is crucial for ensuring the normal operation of the equipment, extending its service life, and ensuring product quality. The following are the main contents of daily maintenance for the blown film unit:

1、 Cleaning aspect

Regularly clean the extruder

Clean the hopper of the extruder, remove residual plastic particles and impurities, and prevent blockage of the feed inlet.

Clean the screw and barrel thoroughly using specialized screw cleaning agents or by disassembling the screw. Remove burnt plastic and carbon deposits attached to the inner walls of the screw and barrel, and maintain the good working condition of the extruder.

Clean the heating device of the extruder, remove dust and dirt from the heating elements, and ensure even heating.

Clean the machine head and mouth mold

After each production is completed, promptly clean the residual plastic on the machine head and mouth mold to prevent the plastic from solidifying and affecting the quality of the next production film.

Use a soft cloth or copper brush to clean the discharge port of the die, maintain the smoothness of the die, and ensure uniform film thickness.

Clean the cooling device

Regularly clean the water tank or cooling fan of the cooling device, remove impurities and scale from the water, and maintain the cooling effect.

Check the pipelines and valves of the cooling device to ensure smooth water flow and no leakage.

Clean the winding device

Clean the reels and tension control system of the winding machine, remove residual plastic film and dust, and ensure smooth winding.

Check the transmission components of the rewinder, such as gears, chains, etc., add an appropriate amount of lubricating oil to maintain smooth transmission.

2、 Lubrication aspect

Extruder lubrication

Regularly add an appropriate amount of lubricating oil to the screw, gearbox and other transmission components of the extruder to reduce wear and extend equipment life.

According to the requirements of the equipment manual, choose the appropriate brand and model of lubricating oil, and pay attention to the replacement cycle of lubricating oil.

Lubrication of traction device

Lubricate the transmission components such as rollers and chains of the traction device to ensure smooth traction and prevent uneven stretching of the film.

Check the bearings of the traction device, add lubricating grease, and maintain the good operation of the bearings.

Lubrication of winding device

Add lubricating oil to the roller bearings, gears, and other components of the winding machine to ensure the normal operation of the winding device.

Check the tension control system of the winding machine to ensure that the tension adjustment components are flexible and reliable, and perform lubrication and maintenance if necessary.

3、 Inspection aspect

Electrical system inspection

Regularly inspect the electrical control system of the blown film unit, including distribution boxes, motors, frequency converters, and other equipment.

Check whether the connections of wires and cables are firm, and whether there are any damages, short circuits, or other phenomena. Ensure good grounding of electrical equipment to prevent leakage accidents.

Check if the instruments and indicator lights on the control panel are working properly, and repair or replace them promptly if there are any abnormalities.

Mechanical component inspection

Check the wear of the screw, barrel, head, die and other components of the extruder, and replace them promptly if there is severe wear.

Check the tension and wear of the rollers, chains, belts, and other components of the traction device, adjust the tension to the appropriate range, and replace severely worn components.

Check the working status of the reel, tension control system, transmission components, etc. of the winding device to ensure smooth winding and stable tension.

Safety device inspection

Check whether the safety protection devices of the blown film unit, such as protective covers and emergency stop buttons, are intact and effective.

Ensure that safety devices are functioning properly and can be shut down promptly in case of unexpected situations, protecting the safety of operators.

4、 Debugging aspect

Temperature adjustment

Before each startup, check whether the temperature control system of the extruder, head, cooling device and other parts is normal.

According to the production process requirements, set appropriate heating and cooling temperatures to ensure the effectiveness of plastic melting and film cooling and shaping.

Regularly check the accuracy of the temperature sensor and calibrate it promptly if there is any deviation.

Speed debugging

Adjust the screw speed of the extruder, the speed of the traction device, and the speed of the winding device to match each other, ensuring stable production speed and quality of the film.

Adjust the speed parameters reasonably according to different film specifications and production requirements to improve production efficiency.

Tension adjustment

Check and adjust the tension of the film during traction and winding to ensure that the film is flat and wrinkle free.

Adjust the parameters of the tension control system based on the material and thickness of the film to maintain the tension within an appropriate range.

In short, the daily maintenance of the blown film unit needs to start from multiple aspects such as cleaning, lubrication, inspection, and commissioning. Regular maintenance work should be carried out to timely detect and solve problems, ensuring the normal operation of the equipment and stable product quality.