Choose the screw, drive and line connection for your thermoplastic extrusion process.
Specify an SJ single-screw extruder for your material, output and product range. Review the screw, heating arrangement and connection to retained equipment.
The SJ series is a single-screw extrusion platform for thermoplastic processing. A useful specification begins with the exact resin and material form, then connects the screw design and drive to the required melt delivery. Pipe, profile and other extrusion applications can place different demands on the same nominal screw size.
For an existing line, identify what will remain: feeding equipment, die, cooling section, haul-off and controls. For a new project, define the finished product and the production target so that the extruder is sized with the complete process in view.
Model Specifications
Compare SJ Models
Compare the listed models against your material, product dimensions and operating requirements.
Parameter
SJ-25
SJ-30
SJ-45
SJ-50
SJ-65
SJ-75
SJ-80
SJ-90
SJ-120
SJ-150
Screw diametermm
25
–
45
50
65
75
80
90
120
150
Screw speedrpm
20–120
20–120
20–150
20–150
20–150
20–150
20–110
20–110
20–90
20–75
Screw L/D ratio (catalog range)
25–28:1
25–30:1
25–33:1
25–33:1
25–33:1
25–33:1
25–33:1
25–33:1
25–33:1
25–33:1
Extruder motor power (catalog configuration/range)kW
0.75–2.2
2.2–5.5
7.5–30
7.5–35
22–90
55–110
37–120
37–185
75–280
90–355
Barrel heating power (catalog)kW
3
3
6–8
6–12
10–15
10–15
15–25
20–30
35–45
50–75
Output (catalog figure/range)kg/h
2–5
5–10
50–150
55–200
60–250
200–350
250–500
320–600
320–800
400–1200
Center height (catalog)mm
1000±50
1000±50
1000±50
1000±50
1000±50
1000±50
1000±50
–
–
–
Catalog power and output ranges describe available series configurations. Select the actual screw, motor and operating conditions for the named material and product.
A dash means no value is listed for that model. Confirm the final specification with the selected configuration.
Design And Function
What The Machine Does On Your Line
01
Single-screw processing
The screw conveys and plasticizes the feed before delivering melt to the die. Geometry, material condition and operating settings should be evaluated together.
02
Model range
The model range provides a starting point for comparison. Use the table to shortlist machines, then confirm the selected configuration against your resin and product.
03
Separate extrusion and line requirements
Extruder output describes one stage of production. Cooling, haul-off and cutting must also support the intended product and line speed.
Model Selection
Not Sure Which Configuration Fits Your Line?
Send your material, product size and output target. We shortlist the model and the options with you before quotation.
Specify resin grade, pipe diameter, wall thickness and material output. Include any color stripe or layer requirements when describing the die arrangement.
Profiles and other extruded sections
Provide the section drawing, surface requirements and downstream process. The die and calibration method influence the melt conditions required from the extruder.
Selection
Points To Settle Before You Specify
Settle these points first and the quotation you receive can be compared line by line.
01
Describe the feed accurately
Identify pellets, regrind or another feed form, along with bulk density, moisture considerations and material blending. Do not describe unlike feedstocks only as plastic.
02
Match the screw to the job
Review screw diameter, length-to-diameter ratio and processing purpose together. A different polymer or product may need a different screw configuration.
Line Interfaces
Connecting It To The Rest Of Your Line
Tooling and center height
Check the die connection, melt outlet, center height and access for tooling changes before approving a replacement.
Line controls
Define how the extruder exchanges operating signals with the haul-off, feeder and other retained equipment.
This video shows QTech-Machinery’s complete nylon tube extrusion line running after installation and commissioning. The line includes an SJ65/28 single screw extruder, customized tube die, vacuum calibration tank, immersion cooling tank, servo belt haul-off, rotary flying knife cutter, conveyor, and automatic collection system.
Viewers can see the full production process from nylon material plasticizing to tube forming, cooling, traction, online cutting, and finished tube collection. It is a practical reference for manufacturers looking for nylon tube extrusion equipment, PA tube production lines, or automatic plastic tube cutting solutions.
Watch this video to see a complete Φ20–Φ110 mm HDPE pipe extrusion line supplied by QTech-Machinery for PE100 water supply pipe production. The line includes automatic feeding, SJ75/33 extrusion, color stripe co-extrusion, vacuum calibration, spray cooling, servo haul-off, cutting, winding, and stacking.
It is a practical reference for customers looking for a reliable HDPE pipe extrusion line manufacturer in China.
Watch QTech-Machinery’s tumbler straw extrusion line for THERMOS, producing LLDPE and PCT reusable straws with automatic feeding, extrusion, cooling, servo cutting, chamfering, and V-shape opening.
What machine is used to produce nylon tubes or PA tubes? Nylon tubes and PA tubes are produced by a complete nylon / PA tube extrusion line, not by a single standalone machine. A professional production line normally includes material drying and feeding, a single screw extruder, customized tube die, vacuum calibration tank, cooling tank, […]
What machines are included in a complete HDPE pipe extrusion line? A complete HDPE pipe extrusion line is not just one extruder. It is a coordinated production system that includes material feeding, drying, extrusion, co-extrusion, die tooling, vacuum calibration, cooling, haul-off, cutting, winding or stacking, electrical control, spare parts, and technical documents. For manufacturers planning […]
How to choose the right tumbler straw extrusion line? Choosing the right tumbler straw extrusion line is not only about buying an extruder. It is about matching material, straw size, output, cooling, cutting, finishing, automation, and supplier support with your real production needs. For reusable tumbler straw production, especially for drinkware brands, the line must […]
Need an answer for your own material or product? Ask Maggie directly.
Can one SJ machine process several materials?
That depends on the screw, temperature range, feeding arrangement and tooling. List the required materials and identify which changes between runs are acceptable.
Should I select only by motor power?
No. Motor power is one specification. Screw design, material behavior, die resistance and the required production result must also be considered.
What is needed for an extruder replacement?
Send the machine nameplate, material and output requirements, die connection drawing, center height, utility details and photographs showing the available space.
Configuration Request
Discuss Your SJ Single-Screw Extruder Configuration
Tell us what you need to produce, the required output and whether this is a new installation or a replacement. Share the information you already have so we can review the next configuration details with you.
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