Plastic strip extruder

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.

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Plastic strip extruder

Model number	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 rotation speed r/min	60	60	60	60	60
Production rate 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 pipe , 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: Suitable for extruding profiles and sheets made from PVC, PET, PS, PP, PC, and other materials. Also applicable to the extrusion of various other plastics into filaments, rods, and similar products.
Extrusion of profiles: By adjusting the extruder speed and modifying the screw design, it can be used to produce various plastic profiles, including PVC and polyolefin-based materials. Modified pelletizing: Suitable for blending, modifying, and reinforcing pelletizing of a wide range of plastics.

Characteristics of Traditional Extruder Drives

Components of Extrusion Molding Equipment An extrusion system typically consists of a main machine (extruder), auxiliary equipment, and a control system. Collectively, these components are commonly referred to as an extrusion unit.

1. Extruder Main Unit: An extruder main unit comprises three major subsystems—extrusion, drive, and heating–cooling. The extrusion system, consisting primarily of the screw and barrel, is the core component of the extruder. The drive system serves to power the screw, ensuring that it maintains the required torque and rotational speed during operation. The heating–cooling system is responsible for precisely controlling the temperature of both the material and the extrusion system throughout the molding process.

2. Auxiliary Equipment: The configuration of auxiliary equipment for extrusion lines varies depending on the type of product being manufactured. Generally, such equipment comprises a die‑and‑calibrator assembly, a cooling system, a traction unit, a cutting device, and a take‑up or stacking mechanism for the finished product.

3. Control System: The extruder’s control system primarily comprises electrical components, instrumentation, and actuators. The variable-frequency drive offers a wide adjustable frequency range of 0–400 Hz and delivers 180% torque at 0.5 Hz, with rapid response times, easily meeting the demands of plastic extruders. Additionally, it features robust anti-interference capabilities, remaining unaffected by extrusion-related disturbances, thereby ensuring more stable and efficient operation.

How many systems does a plastic extruder have, and what are their functions?

Extruders and injection molding machines are both types of plastic-processing equipment. An extruder uses a screw to force molten plastic through a die of a fixed cross-sectional shape; the extrudate is then drawn, water‑cooled to set its shape, and cut into finished products. It is primarily used for the high‑volume, continuous production of items with uniform cross sections, such as pipes, rods, and profiled shapes, and can also be employed for compounding and pelletizing plastics. By contrast, an injection molding machine injects molten plastic into a mold; after cooling, the molded part is removed. Injection molding has a wide range of applications, and the specific uses vary depending on the type of plastic being processed.