Since its establishment in 2004, Nanjing Lesun has concentrated on the production and custom development of core twin-screw extruder components. The company produces 4,000m of screw elements, 1,400 screw shafts, and 1,000 extruder barrels annually on a 16,000 m² location with 10,000 m² of building space and more than 50 employees. Leading manufacturers of modified plastics, masterbatch, petrochemical pelletizing, plastic recycling, food, pharmaceuticals, powder coatings, and feed are among our clients.
MANUFACTURING FOUNDATION
Lesun has been a symbol of superior products, innovative technology, and trustworthy dependability for more than 20 years. Our engineers and technicians satisfy strict delivery criteria, such as quick response and trial production, covering every stage from product development, design, manufacturing, and quality control through to sales and delivery, keeping Lesun at the forefront of essential components for twin-screw extrusion and compounding equipment.
QUALITY ASSURANCE
Stable product quality is the result of a stable production process supported by a comprehensive inspection system. Lesun has consistently invested in inspection capability across the entire process, including raw material, heat treatment, mechanical characteristics, dimensional correctness, surface quality, and finished-part delivery. We quantitatively control key quality indicators using spectral analysis, ultrasonic flaw detection, metallographic analysis, hardness testing, mechanical-property testing, coordinate measurement, and surface roughness inspection, resulting in full-process verification from material to finished part.
Performance of twin-screw core components is determined by material structure, heat-treatment quality, machining accuracy, and assembly consistency, in addition to design. A variation at any step can result in anomalous wear, running vibration, seal failure, or a shorter service life. Lesun thus conducts inspection throughout the manufacturing process rather than just at the end, reducing quality variation through process control while boosting consistency and long-term operating stability.
Our manufacturing plant is equipped with spectrometer, ultrasonic flaw detector, metallographic microscopy system, Rockwell hardness tester, universal materials testing machine, impact tester, coordinate measuring machine (CMM), 2D vision measurement system, runout measuring instrument and roughness tester; covering material composition, internal defects, microstructure, mechanical properties, dimensional tolerance, geometric accuracy, and surface quality, and providing data support for product reliability.
With a comprehensive inspection capability and standardized quality control, each batch includes a full quality record with traceable key inspection data, meeting the consistency, interchangeability, and supply-chain quality requirements of international OEM machine builders and large compounding and pelletizing producers.
More stable product quality and batch consistency
More reliable assembly precision and cross-brand interchangeability
Lower early-failure risk and unplanned-downtime cost
Longer part service life and more stable process operation
WHY LESUN
Lesun, with over 20 years of experience and a technical database covering the major twin-screw brands worldwide, provides more than just dimensional compatibility. We maintain the critical fit parameters, torque-transmission capacity, and running stability that the original equipment requires. Customers gain dependable replacement and long-term stability without changing existing processes or equipment.
Diverse situations necessitate diverse material solutions. Lesun provides a complete material system for high-filler, high-glass-fiber, flame-retardant, recycled, corrosive, and high-temperature engineering plastics applications, ranging from tool steels and high-performance alloy steels to HIP powder-metallurgy wear-resistant materials. This system optimizes the combination of material, heat treatment, and surface engineering to achieve the best balance of wear resistance, corrosion resistance, and fracture toughness.
Beyond standard conveying and kneading elements, Lesun creates customized solutions based on each customer's material characteristics and process goals, such as low-shear mixing elements, high-dispersion mixing elements, high-efficiency conveying elements, special venting-section elements, and custom barrel configurations. We offer tailored engineering to achieve better dispersion, lower material temperature rise, enhanced fiber retention, or increased output and consistency.
Lesun maintains inventory of essential alloys and wear-resistant materials, reducing raw-material lead times that cause manufacturing delays. When combined with standardized manufacturing, high-precision machining, and a well-established worldwide logistics infrastructure, this allows for a quick response from order confirmation to delivery, assisting clients in reducing downtime and supply chain risk.