The feed pressure of the polypropylene extrusion granulator is too high – what could be the reason?

There may be several reasons for the high cutting pressure: 1. Improper adjustment of the extruder: If the cutting pressure of the extruder is not adjusted properly, it becomes impossible to keep the pressure within the normal range when using manual control, resulting in high pressure. 2. Excessively high temperature: Polypropylene extrusion granulators carry out the extrusion process at high temperatures; if these temperatures are too high, the plastic becomes more soft, which increases friction between the knife and the die, thereby leading to higher pressure exerted by the knife. 3. Mold wear: After prolonged use, the mold of the extruder may become worn, resulting in a smaller gap between the knife and the mold. This, in turn, causes the knife pressure to be excessively high. 4. Extrusion material issues: If the content of certain components or impurities in the extrusion material is too high, it will increase the resistance between the cutter and the die, thereby resulting in a higher cutting force. In light of the above situation, the following measures can be attempted to resolve it: 1. Adjust the extruder to bring the feed pressure back within the normal range. 2. Control the temperature of the extruder to ensure extrusion is carried out at an appropriate temperature. 3. Regularly inspect and replace worn molds to maintain an appropriate gap between the blade and the mold. 4. Screen and clean the extruded material to ensure that there are no excessive components or impurities in it. If necessary, the materials can be pre-treated. If the problem persists, it is recommended to consult a professional technician for repair. .

There is suspicion that the blade shaft is jammed by the fabric, which affects the cutting process

Jamming of the tool shaft in the material can cause difficulty in feeding or excessive tool pressure. You can try the following methods to solve this problem: 1. Clean the knife shaft: Remove any debris from the knife shaft, especially from the surfaces that come into contact with the material. Use tools such as brushes or air guns to clean the knife shaft, ensuring there are no residues left. 2. Lubricate the cutter shaft: Apply an appropriate lubricant along the shaft to reduce friction. However, it is important to use an appropriate amount of lubricant; too much lubricant may cause the material to stick together or affect product quality. 3. Check the alignment between the cutter shaft and the mold: Ensure proper alignment between them to prevent unnecessary lateral forces from causing difficulties in feeding the cutter shaft. 4. Adjust the tool shaft speed: Properly adjusting the rotational speed of the tool shaft can improve the cutting process. Adjust the rotational speed of the tool shaft up or down according to the actual conditions to find the most suitable feed rate. 5. Replace the tool shaft or die: If the above methods do not work, it may be necessary to replace the damaged tool shaft or die to ensure proper cutting operation. If the problem persists, it is recommended to consult the extruder manufacturer or maintenance technician for more professional assistance. .

How can we prevent such problems from happening again? Does anyone have any good ideas?

To prevent the issue of the cutting shaft getting stuck in the raw material from occurring again, you can consider the following methods: 1. Regular cleaning and maintenance: Clean the cutting shaft and molds regularly, remove impurities such as scraps of raw material, and ensure that the surface of the cutting shaft is clean with no residues. At the same time, lubricate the cutter shaft regularly to reduce friction. 2. Standardize operating procedures: Ensure that operators follow the correct procedures to work, thereby avoiding unnecessary operational errors or carelessness that could lead to blockages in the knife shaft. 3. Control the feeding speed: Manage the feeding speed properly to prevent difficulties in feeding the cutter shaft caused by too fast or too slow feeding. Adjust the feed rate according to the actual conditions to find the optimal operating parameters. 4. Regularly check the wear of the cutter shaft and molds: Periodically inspect the degree of wear on the cutter shaft and molds, and replace any damaged ones promptly to maintain the proper gap between them. 5. Use high-quality cutter shaft materials and molds: Choosing high-quality cutter shaft materials and molds provides better wear resistance and anti-adhesion properties, reducing the likelihood of cutter shaft blockage. 6. Train operators: Provide operators with the necessary training and guidance to help them understand the standard operating procedures and routine maintenance methods, thereby preventing operational errors or neglect of maintenance tasks. In summary, problems such as the jamming of raw material in the cutter shaft can be effectively avoided through regular cleaning and maintenance, standardized operating procedures, and control of the feeding speed. .