How to diagnose and repair the malfunction of the PE blown film machine?

As the core equipment for plastic film production, the performance and quality of PE blown film machine directly affect the production efficiency and product quality of the film. By understanding the working principle, main components, operating procedures, and maintenance of the PE blown film machine, operators can better master the operation and maintenance skills of the equipment, ensuring efficient and stable operation of the equipment and high-quality production of films. With the continuous development of plastic processing technology, PE blown film machines will continue to be upgraded and improved, providing stronger technical support for the development of the plastic film industry.

PE film is one of the main materials in the packaging industry, used to make plastic bags, food packaging films, industrial packaging films, etc. Its excellent waterproofing, flexibility, and printability make it the preferred packaging material. PE film is mainly used in agriculture for the production of plastic film, greenhouse film, and anti-seepage film. Plastic film can keep warm and moisturize, promote crop growth; Greenhouse film can regulate the temperature and humidity inside the greenhouse, increasing crop yield.

How to diagnose and repair the malfunction of the PE blown film machine?

Uneven film thickness

Reason for malfunction

Uneven discharge from the mold head: The internal flow channel design of the mold head is unreasonable or blocked by impurities, resulting in inconsistent flow velocity of the plastic melt at the mold head outlet.

Unstable inflation ratio: Unstable inflation air pressure or fluctuating traction speed can cause different degrees of expansion in various parts of the film during the inflation process.

Uneven cooling: The air outlet of the cooling air ring is uneven, or the cooling water flow rate is inconsistent, causing the film to shrink unevenly during the cooling process.

maintenance methods

Clean the mold head, check whether the flow channel is worn or deformed, and repair or replace it if necessary. At the same time, regularly maintain the mold head to prevent impurities from accumulating.

Stabilize the inflation air pressure and check for any air leaks in the air compressor and related pipelines. Adjusting the traction speed to maintain stability can be achieved by installing a speed controller.

Adjust the air outlet of the cooling air ring to ensure even air flow. Check the cooling water pipeline to ensure smooth water flow, and clean it promptly if there is any blockage.

The film has bubbles or holes

Reason for malfunction

Moisture in raw materials: Polyethylene plastic particles become damp during storage, and when heated and melted, the moisture evaporates to form bubbles.

Excessive extrusion temperature: causing excessive decomposition of plastic melt, resulting in the formation of gas bubbles.

Impurities or damage to the mold head: Impurities are mixed into the plastic melt, or the surface of the mold head is damaged, causing holes to appear in the film during the molding process.

maintenance methods

Dry the damp raw materials by using drying equipment to ensure that their moisture content meets the requirements. At the same time, strengthen the storage management of raw materials to prevent them from getting damp.

Reduce the extrusion temperature and adjust the temperature of each section of the extruder reasonably according to the characteristics of the raw materials and the requirements of the equipment. At the same time, regularly check the temperature sensor and heating device to ensure accurate temperature control.

Clean the mold head and remove impurities. Check if there is any damage on the surface of the mold head. If there is any damage, repair or replace the mold head in a timely manner. During the production process, a filter screen can be installed to prevent impurities from entering the mold head.

The device is running unstably

Reason for malfunction

Wear of mechanical transmission components: such as screws, gears, chains, and other components wear, leading to a decrease in transmission accuracy and equipment shaking or lagging during operation.

Electrical system failure: Motor failure, frequency converter failure, or poor electrical circuit contact can all lead to unstable equipment operation.

Lubrication system malfunction: Insufficient lubrication or poor quality of lubricating oil can exacerbate the wear of mechanical components and affect the normal operation of equipment.

maintenance methods

Check the wear of mechanical transmission components and replace severely worn parts. Regularly maintain the equipment, lubricate and adjust the transmission components to ensure transmission accuracy.

Check the operating status of the motor and frequency converter, and promptly repair or replace any faults. At the same time, check if the electrical circuit connections are secure and tighten them promptly if they are loose.

Regularly check the lubrication system to ensure sufficient lubricating oil and replace deteriorated lubricating oil in a timely manner. Clean the filter of the lubrication system to prevent impurities from entering the lubrication system.

Unorganized winding of rolls

Reason for malfunction

Mismatch between traction speed and winding speed: The two speeds are not consistent, resulting in uneven elasticity of the film during the winding process.

Failure of winding device: Uneven surface of winding roller, improper control of winding tension, or malfunction of winding motor can all affect the quality of winding.

Quality issues with the film itself, such as uneven thickness and inconsistent tightness on both sides, can also lead to uneven winding.

maintenance methods

Adjust the traction speed and winding speed to match each other. By installing speed sensors and controllers, the speed of both can be precisely controlled.

Check the surface flatness of the winding roller, and repair or replace it promptly if there is wear or deformation. Adjust the winding tension to maintain uniformity and stability. Check the operation of the winding motor and repair or replace it promptly if there is any malfunction.

Resolve the quality issues of the film itself, such as adjusting the die discharge, stabilizing the inflation ratio, and ensuring uniform cooling, to ensure uniform thickness of the film and consistent tightness on both sides.

PE Blown Film Extrusion Machine is an important equipment in the plastic processing industry, mainly used for producing polyethylene (PE) film. PE film is widely used in packaging, agriculture, construction, medical and other fields, with excellent characteristics such as lightweight, flexibility, corrosion resistance, and waterproofing. As the core equipment for producing PE film, the performance of the blown film machine directly affects the quality and production efficiency of the film.

Add polyethylene particles or recycled materials into the hopper, and after drying treatment (if necessary), enter the extruder. The extruder melts polyethylene particles into a uniform plastic melt through heating and rotation of the screw, and extrudes them into a tubular film through the die. The tubular film extruded from the die is inflated by compressed air to form a film bubble tube with a certain diameter and thickness.