During the extrusion process, the extruder screw may suddenly get stuck. At this time, if the protection device of extruder does not work, the operator should immediately stop the operation. More commonly, the screw can still rotate, but the speed slows down, and at the same time a harsh metal scraping sound is made, the current rises sharply, and the operator should also stop the machine immediately.
Then, the reasons why the extruder screw suddenly does not rotate are as follows:
1. Foreign matter enters the extruder barrel and blocks the screws. If it is a ferrous metal foreign body, it will cause huge damage to the screw and barrel.
2. The screw and barrel are deformed.
3. The temperature of the lens barrel of the extruder barrel is too low, or the filter plate is blocked, causing the pressure of the lens barrel to rise sharply, so that the screw is deformed.
4. The design of the screw spring barrel of extruder screw is unreasonable. If the compression ratio of the screw design is too large, it is easy to deform the screw in use.
5. The thermal expansion coefficient of the extruder screw barrel is too different from the extruder screw material used. When the extruder barrel is heated, the barrel will cool. If the extruder barrel is not cooled, it may be locked.
LESUN is specialized in the production of parallel and co-rotating modular screw elements, barrels and shafts, involving various types with diameters between Ø20mm and Ø300mm. After more than ten years of vigorous development, our company now has several sets of advanced CNC machine tools and processing equipment dedicated to processing screws. Now our processing business has basically realized intelligence and automation. Advanced processing methods, strong technical force, and sophisticated processing technology ensure that the quality of each production technical target can fully meet customer needs.
CKE elements combine conveying and mixing functions, providing gentle material exchange with low shear and reduced energy consumption.
Best suited for:
Heat-sensitive materials
Low-shear compounding processes
Applications requiring stable conveying with mild mixing
Primary feeding barrel introducing raw materials into the extruder under controlled fill and stable conveying conditions.
Best suited for:
Main material feeding
Pellet and powder input
Stable process start
Single flight conveying elements provide higher conveying efficiency than standard double flight elements. Their wider flight design reduces leakage flow and increases pressure-building capability.
Best suited for:
Feeding sections
Extrusion zones
Applications requiring strong conveying force
Triple flight elements provide strong distributive mixing with lower shear. They are commonly used in melt mixing sections where gentle material distribution is required.
Best suited for:
Melt distribution
Sensitive materials
Low-shear compounding
Reverse kneading elements introduce backflow and pressure build-up, increasing residence time and enhancing mixing intensity.
Best suited for:
Before venting zones
Degassing preparation
High mixing demand sections
Cold-Forming high-torque shaft with improved strength and fatigue resistance for demanding extrusion conditions.
Best suited for:
High torque extrusion systems
High filler compounding
Continuous high-load production
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