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Compact, Precise, 360° Adjustable Lab-to-Production Solution
Compact SJ25/26 single screw extruder with 0–3 kg/h output, 360° rotation and height-adjustable frame, optimized BM screw for high plastication and stable melt, premium electricals, and precise multi-zone temperature control—ideal for R&D, small-batch production, and profile/filament applications.
Product Overview
What is SJ25/26
The SJ25/26 is a high-precision single screw extruder designed for small-lot production, material testing, and laboratory-scale continuous extrusion. With a maximum output of 0–3 kg/h and a 26:1 L/D, it delivers uniform melting, excellent plastication, and stable throughput in a compact footprint.
360° Adjustable, Height-Lift Design
- 360° rotation and vertical lift for flexible line integration, easy alignment to downstream equipment, and ergonomic operation.
- Center height 1000 mm (+150, -50 mm) to accommodate different dies, calibration tables, and take-off heights.
Key Features
Optimized BM Screw Geometry
- High plastication rate and uniform melt quality ensure consistent product dimensions and smooth surfaces.
- Stable, continuous output supports precise diameter/thickness control for profiles, tubes, filaments, and sheets.
Durable Materials and Surface Treatment
- Screw and barrel made of 38CrMoAlA; screw surface hard chrome plated.
- Barrel inner surface is nitrided and finely honed for wear and corrosion resistance, extending service life with filled or abrasive materials.
Precise Temperature Control (5 Zones)
- Heating zones: Screw 3 zones, flange 1 zone, die 1 zone (total 5).
- Temperature range: 100–360 °C with Dongqi controllers (or customer-preferred instrumentation).
- Ceramic heater bands ensure fast, uniform heating for stable melt temperature.
Quality Electrical Components
- Stainless steel hopper for clean feeding.
- Delixi electricals, Schneider contactors and push buttons for reliability and global serviceability.
Reliable Drive and Gearbox
- 4 kW premium VFD motor, 50–1500 rpm wide speed range.
- Yaskawa 4 kW inverter for smooth vector control and precise torque at low speeds.
- Direct connection to a hardened-tooth gearbox (Ruidesen brand) for efficient power transmission and low noise.
Fast Changeover, Easy Integration
- Two-piece quick-open die flange with dual heater rods speeds up die changes and startup.
- Thermocouple and aviation connector models match customer samples for plug-and-play replacement.
- Custom exterior dimensions, styles, and screw fasteners strictly follow client-provided photos/drawings.
Technical Specifications
Extruder Model
- Model: SJ25/26
- Max Output: 0–3 kg/h
- Center Height: 1000 mm (+150, -50 mm)
- Frame: Height adjustable, 360° rotatable
Screw and Barrel
- L/D Ratio: 26:1
- Speed Ratio: 22:1
- Screw Rotation: Counterclockwise (viewed from shank to tip)
- Structure: Optimized BM screw for high plastication and uniform melt
- Materials: 38CrMoAlA; screw hard-chrome plated
- Barrel Treatment: Nitrided and honed inner surface
- Vent: Barrel with exhaust port
- Origin: In-house design, processed in Zhoushan
- QA: Supplier-issued material composition certificates
Heating and Control
- Zones: 5 total (3 screw, 1 flange, 1 die)
- Heating Method: Ceramic heater bands
- Heating Power: 1 kW × 3 (core band groups), auxiliary die heaters included
- Temperature Range: 100–360 °C
- Controllers: Dongqi (or as per customer’s current model preference)
Drive and Transmission
- Main Motor: 4 kW branded VFD motor
- Speed Range: 50–1500 rpm
- Speed Control: 4 kW Yaskawa variable-frequency drive
- Connection: Direct-coupled motor-to-gearbox
- Gearbox: Hardened-tooth reducer (Ruidesen)
Die and Interfaces
- Die Flange: Two-piece quick-open type with two heater rods
- Sensors/Connectors: Thermocouples and aviation plugs per customer samples
Build and Customization
- Exterior dimensions and style per customer photos
- Screw/bolt sizes strictly matched to provided references
Process Advantages
Stable Melt, Clean Surface
- Optimized screw ensures low pulsation, excellent mixing, and minimal gels for premium surface quality.
Wide Material Window
- Suitable for PP, PE, ABS, PC, PMMA, PETG, TPU/TPE, PA, and additive-rich formulations for R&D and specialty runs.
Fine Speed and Temperature Control
- Broad RPM range and precise multi-zone heating enable accurate residence time and viscosity tuning for lab-to-pilot transferability.
Applications
R&D and Quality Labs
- Material formulation screening, color masterbatch evaluation, additive and filler trials, rheology tuning, and sample preparation.
Small-Batch Production
- Precision profiles, filaments, micro-tubing, wire/cable insulation samples, and thin sheets for pilot orders.
Education and Demonstration
- Universities and institutes for process education, extrusion training, and demonstration lines.
User Feedback and Market Recognition
What Customers Say
- “The 360° rotation and center-height lift make alignment with different dies and take-off units effortless.”
- “Uniform melt and stable output greatly improved consistency for our micro-tube line.”
- “Yaskawa VFD and hardened gearbox ensure smooth startup and tight low-speed control for R&D.”
Market Performance
- Adopted by labs, universities, and specialty processors for reliable small-lot, high-precision extrusion.
- Strong repeat orders due to durability, ease of setup, and compatibility with existing downstream equipment.
