35mm Laboratory Twin Screw Extruder Barrel for R&D and Process Testing

This 35mm laboratory twin screw extruder barrel is designed for material research, formulation screening, process development and small-scale pilot trials.

Its modular segmented structure allows individual barrel sections to be configured for feeding, mixing, venting, cooling or other test functions. Materials, inner-bore protection, ports and temperature-control layouts can also be customized according to the experimental objective.

The barrel helps R&D teams address common testing problems such as:

• Limited flexibility when changing experimental configurations
• Unstable temperature conditions between test runs
• Inconsistent screw-to-barrel clearance
• Excessive material consumption during early formulation trials
• Difficulty testing abrasive or corrosive formulations
• Long setup time when changing feeding or venting positions
• Test results that cannot support later process scale-up

Laboratory extrusion is often used before full-scale production to compare materials, additives, fillers and operating conditions.

A smaller extruder allows engineers to evaluate multiple formulations while using less raw material than a production line.

Typical research tasks include:

• Comparing resin and additive combinations
• Testing different filler percentages
• Evaluating color or functional masterbatch formulations
• Studying dispersion and mixing performance
• Determining suitable processing temperatures
• Observing pressure and torque changes
• Preparing samples for downstream testing

The laboratory extruder barrel should provide consistent geometry and temperature conditions so that differences between test results mainly reflect the formulation and process settings rather than variation in the equipment.

A modular lab extruder barrel allows individual sections to be selected according to the test objective.

Available configurations can include:

Used for conveying, melting, mixing and pressure development.

Designed for the main feeding position and matched to the existing hopper or feeder.

Used to remove trapped air, moisture or volatile components during experimental processing.

Used to introduce fibers, powders, fillers or additives at a selected downstream position.

Because the barrel is segmented, one functional section can be replaced or repositioned without manufacturing a completely new barrel assembly.

This improves experimental flexibility and reduces the amount of hardware required for different test programs.

Temperature stability is important when comparing formulations or processing conditions.

If one test is performed under different thermal conditions from another, the results may not be directly comparable.

The barrel can be configured with:

• Electric heater holes
• Independent water-cooling channels
• Separate inlet and outlet connections
• Temperature sensor holes
• Individual temperature zones
• Customized heating and cooling interfaces

Independent zone control allows different process stages to use different temperature settings.

For example, the feeding zone may require cooling, while the melting and mixing zones require controlled heating. High-shear sections may also require additional cooling to remove internally generated heat.

Temperature control should still be evaluated together with screw speed, throughput, material properties and screw configuration.

Laboratory development may involve materials that are not yet fully characterized.

Some experimental formulations contain:

• Glass fiber
• Mineral fillers
• Pigments
• Flame retardants
• Reactive additives
• Corrosive components
• Functional powders

These materials may create abrasion, corrosion or a combination of both.

Available barrel material options include:

38CrMoAlA with nitriding can be used for general polymer testing and moderate wear conditions.

Stainless steel may be selected where improved corrosion resistance, easier cleaning or reduced iron contamination is required.

For more demanding test materials, optional solutions include:

• Tool-steel liner
• Nickel-based alloy liner
• Laser-clad inner bore
• Integral alloy sleeve
• Customized wear- and corrosion-resistant systems

The material should be selected according to the test formulation rather than applying the highest-cost material to every barrel section.

Laboratory extrusion data is often used to support decisions for pilot or production-scale equipment.

The barrel itself cannot guarantee direct scale-up, because production behavior also depends on:

• Screw diameter
• Screw speed
• Throughput
• Free volume
• Torque
• Residence time
• Heat-transfer area
• Screw configuration

However, stable barrel geometry and repeatable temperature control can improve the reliability of the laboratory data used for comparison and process development.

For scale-up studies, it is helpful to record:

• Material formulation
• Screw configuration
• Barrel temperature settings
• Actual melt temperature
• Screw speed
• Feed rate
• Torque
• Melt pressure
• Product quality results

This allows the laboratory test conditions to be evaluated more systematically before larger-scale trials.

The barrel can be manufactured according to:

• Original technical drawing
• Used barrel sample
• Measured dimensions
• Existing machine interfaces
• Experimental process requirements

Customizable details include:

• Inner-bore dimensions
• Center distance
• Barrel length
• Connection faces
• Positioning dimensions
• Bolt-hole locations
• Feeding and venting ports
• Side-feeder interface
• Heating holes
• Cooling channels
• Sensor holes
• Inner-bore material and protection

When manufacturing from a used sample, worn or corroded dimensions must be identified and corrected rather than copied directly.

Inspection can include:

• Inner-bore dimensions
• Center distance
• Overall length
• Connection-face accuracy
• Positioning dimensions
• Bolt-hole locations
• Port dimensions
• Heating-hole positions
• Cooling-channel sealing
• Inner-surface condition
• Material verification

Inspection records can be retained for dimensional traceability and future repeat orders.

Please provide:

1. Laboratory extruder drawing or used barrel sample
2. Barrel bore and center distance
3. Required barrel-section functions
4. Existing heating and cooling layout
5. Processed material
6. Filler or additive information
7. Corrosion or abrasion concerns
8. Required temperature range
9. Required ports or sensor positions
10. Existing dimensional or process problem
11. Expected test purpose
12. Required quantity

Yes. A modular structure allows one section to be replaced when the adjacent sections and interface dimensions remain suitable.

Yes. Feeding, venting, vacuum, side-feeding and closed sections can be configured according to the test program, subject to the existing machine structure.

No. The material depends on corrosion, wear, cleaning and contamination requirements. Nitrided steel may be suitable for general polymer testing, while stainless steel or alloy protection may be better for aggressive formulations.

Laboratory results provide important process information, but direct scale-up also depends on screw geometry, throughput, torque, residence time and heat-transfer conditions.

Send us your existing barrel drawing, test material and required experimental functions.

We can help evaluate:

• Which barrel-section configuration is required
• Whether independent cooling or heating zones are needed
• Which bore material is suitable for the test formulation
• Whether the existing interfaces can be retained
• Which dimensions must be confirmed before manufacturing

Send Your Laboratory Extruder Requirements for Technical Review