Features: 1. Utilizes a matched main–auxiliary machine configuration, ensuring stable heating temperatures, effectively improving the material’s molecular structure, enhancing air permeability, and significantly boosting pellet quality. 2. The plastic pelletizing unit primarily consists of a main machine, a crusher, an automatic traction system, and a pelletizer; the main machine is equipped with an automatic screen‑changing device. 3. Both the main and auxiliary machine screw barrels are manufactured from high‑strength, premium carbon structural steel. 4. The plastic pelletizer employs a conical screw barrel design, enabling rapid feeding and high production output. 5. All recycled materials, after sorting, crushing, and cleaning, can be processed directly without the need for spin‑drying or drying by baking or sun exposure, making it suitable for both dry and wet applications. 6. Features a modular, fully automatic electrical distribution system to ensure safe and reliable motor operation. 7. The machine boasts an elegant and sophisticated appearance, with customizable color finishes available upon customer request. Plastic Pelletizer Modifications: A plastic pelletizer is a molding machine capable of shaping materials into specific forms. Its innovative design increases the thread pitch between the screws, allowing for thorough plasticization and melting within the barrel during heating. A variable‑diameter configuration has been adopted, which technologically extends the relative service life of the screws. Furthermore, the use of high‑strength 38CrMoAlA alloy in material selection enhances the overall performance of the machine. The pelletizer’s barrel is crafted from 45# steel, finely machined, and then quenched to achieve high hardness along with excellent wear and corrosion resistance. Additionally, strategically placed slots at the feed end facilitate smooth material intake.

Model SJ-30 SJ-65 SJ-80 SJ-90 SJ-105 Screw Diameter (mm) 30 65 80 90 105 Length-to-Diameter Ratio 25:1 25:1 25/30:1 25/30:1 25/30:1 Motor Power (kW) 2.2 7.5 11–15 15–18.5 22 Machine Center Height (mm) 850 850 850 1000 1100 Screw Speed (r/min) 60 60 60 60 60 Output (kg/h) 5–8 40–80 80–150 150–250 220–330 Main Applications of High-Speed Single-Screw Extruders Pipe Extrusion: Suitable for PP-R pipes, PE gas pipes, PEX cross-linked pipes, aluminum-plastic composite pipes, ABS pipes, PVC pipes, HDPE silicon-core pipes, and various co-extruded composite pipes. Sheet and Plate Extrusion: Applicable to extruding profiles and sheets made from PVC, PET, PS, PP, PC, and other materials. Also suitable for extruding various other plastic products such as filaments and rods. Profile Extrusion: By adjusting the extruder speed and modifying the screw design, it can produce PVC and polyolefin-based plastic profiles of various shapes. Modified Pelletizing: Ideal for blending, modifying, and reinforcing pelletizing of different types of plastics. Characteristics of Traditional Extruder Drives Components of Extrusion Molding Equipment An extrusion machine typically consists of a main unit (extruder), auxiliary equipment, and a control system. Collectively, these components are referred to as an extrusion line. 1. Main Unit The main unit of an extruder comprises three major subsystems: extrusion, drive, and heating/cooling. The extrusion system mainly consists of the screw and barrel, which are critical components of the extruder. The drive system is responsible for powering the screw, ensuring that it maintains the required torque and rotational speed during operation. Meanwhile, the heating and cooling system regulates the temperature of both the material and the extrusion system throughout the molding process. 2. Auxiliary Equipment The specific auxiliary equipment varies depending on the type of product being manufactured. Generally, auxiliary units include metering devices, shaping molds, cooling systems, traction mechanisms, cutting devices, and equipment for winding or stacking finished products. 3. Control System The control system of an extruder primarily includes electrical components, instrumentation, and actuators. A variable-frequency drive offers a wide adjustable frequency range from 0 to 400 Hz, delivers 180% torque at 0.5 Hz, responds rapidly, easily meets the demands of plastic extrusion machines, and exhibits strong anti-interference capabilities, ensuring stable and efficient operation without being affected by extrusion-related disturbances. How many systems does a plastic extruder have, and what are their functions? Both extruders and injection molding machines are plastic processing equipment. An extruder uses a rotating screw to force molten plastic through a die of fixed shape, then cools and shapes the material before cutting it into finished products. It is mainly used for mass-producing items with uniform cross-sections, such as pipes, rods, and profiled sections, and can also be employed in modified pelletizing processes. In contrast, an injection molding machine injects molten plastic into a mold; after cooling, the molded part is ready. Injection molding has extremely broad applications, with specific uses varying according to the type of plastic involved.

The pelletizing unit is ingeniously composed of an upper-stage pelletizer and a lower-stage pelletizer. Films, fibers, and other materials are rapidly shredded into pellets before being directly fed into the extruder. Depending on the material, the pre‑pelletizing extrusion recycling pelletizing unit can be equipped with either a short‑screw extruder or an vented extruder. Its low melt temperature effectively minimizes further degradation of the material. The PVC/PE/PS series pelletizing units are complete systems comprising a pelletizer and its corresponding auxiliary equipment. They are primarily used to produce various plastic pellets such as PVC, yielding uniform, dense, and aesthetically pleasing granules. These units offer excellent plasticization performance, high production efficiency, a compact overall structure, and a high degree of automation. 1. Extrusion System: The extrusion system comprises the screw, barrel, hopper, die head, and mold. Plastics are plasticized into a uniform melt within this system and, under the pressure generated during the process, continuously extruded through the die head by the screw. (1) Screw: This is the most critical component of the extruder, directly influencing its application scope and productivity. It is manufactured from high-strength, corrosion-resistant alloy steel. (2) Barrel: A metallic cylindrical component typically made of heat‑resistant, high-pressure‑strength, wear‑resistant, and corrosion‑proof alloy steel, or a composite steel pipe lined with alloy steel. Working in conjunction with the screw, the barrel crushes, softens, melts, plasticizes, vents, and compacts the plastic while continuously and uniformly delivering the molten material to the forming system. Generally, the barrel length is 15–30 times its diameter, ensuring thorough heating and complete plasticization of the material. (3) Hopper: Equipped at its base with a shut-off device for adjusting and interrupting the material flow, the hopper also features side viewing ports and calibrated measuring devices. (4) Die Head and Mold: The die head consists of an inner sleeve made of alloy steel and an outer jacket of carbon steel, housing the forming mold. Its function is to convert the rotating motion of the molten plastic into a steady, parallel linear motion, smoothly guiding it into the mold cavity while applying the necessary forming pressure. After being plasticized and compacted within the barrel, the plastic passes through a porous filter plate along designated channels, flows through the die neck, and enters the forming mold. Proper coordination between the core and the mold cavity creates a progressively narrowing annular gap, enabling the molten plastic to form a continuous, tightly packed tubular coating around the core wire. To ensure proper flow paths inside the die head and eliminate dead zones where plastic might accumulate, diversion sleeves are often installed; pressure‑balancing rings may also be added to mitigate fluctuations in extrusion pressure. Additionally, the die head includes mechanisms for correcting and adjusting the mold, facilitating precise alignment of the core and mold cavity concentricity. Extruders classify their die heads based on the angle between the material flow direction and the screw’s central axis: oblique‑angle dies (with a 120° angle) and right‑angle dies. The die head’s outer shell is secured to the machine body via bolts, while the internal mold contains a core seat fixed to the inlet end by nuts. The front of the core seat houses the core itself, and both the core and its seat feature central holes for the core wire. A pressure‑balancing ring is mounted at the front of the die head to equalize pressure. The extrusion forming section comprises the mold holder and the mold assembly; the position of the mold can be adjusted using support bolts, allowing fine-tuning of the relative positioning between the mold and the core, thus facilitating even control over the thickness of the extruded layer. External heating and temperature‑monitoring devices are also installed on the die head. 2. Drive System: The drive system powers the screw, supplying the torque and rotational speed required during the extrusion process. It typically consists of an electric motor, a reducer, bearings, and related components. 3. Heating and Cooling System: Heating and cooling are essential prerequisites for carrying out the plastic extrusion process.

Model XJ-120 XJ-150 XJ-200 XJ-250 Screw Diameter (mm) 120 150 200 250 Length-to-Diameter Ratio 5:1 5:1 5:1 5:1 Motor Power (kW) 37 55 75 110 Screw Speed (r/min) 30–50 30–50 30–50 30–50 Output (kg/h) 200–400 350–450 400–800 600–1000 Applications and Features A rubber filter machine is a device that uses the pushing and conveying action of a screw to remove impurities from raw rubber or reclaimed rubber. It mainly consists of a screw, a barrel, a filter head, and a drive mechanism. The filter head is equipped with a perforated plate and a filtration mesh; the perforated plate supports the filtration mesh and serves as the discharge port, featuring conical holes that widen in the direction of rubber flow. Safety Operating Procedures for Rubber Filter Machines 1. Before filtering, preheat the filter head and body to the specified temperature. 2. The motor load must not exceed the rated value (160 amperes). 3. During normal filtration, the maximum rubber temperature should not exceed 140°C; for chloroprene rubber, the limit is 105°C. 4. Do not filter burnt rubber mixtures, and ensure that filtered mixtures contain no charred particles. 5. Cold rubber must not be filtered; if cold rubber needs to be processed, it must first be softened before filtration. 6. Do not introduce metallic or other foreign objects into the filter machine. 7. Never manually stuff rubber into the feeder or attempt to remove rubber by hand while the machine is running. Technical Highlights of Rubber Filter Machines 1. Screw diameters are typically 150 mm or larger. 2. The length-to-diameter ratio is generally around 5:1. 3. The screw structure features uniform pitch and depth. 4. Compression ratios are very low—many models operate without compression. 5. Rotational speeds are relatively slow, requiring high power output to achieve efficient filtration. 6. Cooling is essential for extruders, but even more so for rubber filter machines. 7. The diameter of the screen holes is approximately 1.7 times the screw diameter. 8. Filtration meshes usually have a mesh count of around 50. Rubber filter machines, including those used for inner tube filtration, are designed to remove impurities from rubber compounds. Their filter heads are hinged and mounted on flanges attached to the machine body, with a worm-gear drive system for easy opening and closing, ensuring energy efficiency and convenient operation. The machine body incorporates spiral-shaped water‑vapor channels that provide excellent temperature control, along with thermocouples, temperature sensors, and millivolt meters for precise temperature monitoring. Both the screw and liner are made of high-quality alloy steel and undergo nitriding treatment, offering superior strength and wear resistance. The reducer employs involute cylindrical gear transmission, featuring a compact oil‑bath lubrication system that keeps weight low.