Injection Moulding Machine for Castor Wheels and Roller Wheels
Castor and roller wheels with a soft tread are made on two-shot injection moulding machines: a rigid PA6, PP or POM hub with an overmoulded TPU or TPE tread. Machine size follows wheel diameter, tread thickness and both shot weights. Tread to hub bond matters most and is proven by a peel test, not assumed from the datasheet.
Selection for two-material wheels depends on the shot ratio between hub and tread and on how the mould transfers the hub. Pratishna Engineers builds special purpose machines to application for two-shot wheels, supplies horizontal machines for single-material wheels, and can recommend a configuration.
Manufacturing Castor Wheels?
Share your wheel drawing, hub and tread materials and load rating, and Pratishna Engineers will recommend a suitable machine.
Machine Requirements for Castor and Roller Wheel Moulding
Castor and roller wheels combine a load-bearing hub with a tread that must not flat-spot or peel. Machine selection should consider:
- Two-shot process for a TPU or TPE tread on a rigid hub
- Material pairing and hub surface that give a peel-tested bond
- Long cooling time for thick tread sections prone to sink
- Drying for PA6 hubs and TPU tread material
- Creep-resistant compound so parked wheels do not flat-spot
- Concentric bore for the axle or bearing seat
Recommended Machine for Castor Wheels and Roller Wheels
A two-shot wheel with an overmoulded tread needs a machine built to application, and Pratishna Engineers builds special purpose machines to application for it. Single-material PP, PA6 or POM wheels run on standard machines: smaller wheels on the E Series (75-180 T), larger wheels or multi-cavity moulds on the C Series (140-320 T), or the H Series (120-350 T) where mould height calls for it.
Not Sure Which Machine You Need?
Share your hub and tread details for a machine recommendation.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
- In-House Engineering & Manufacturing
- Multiple Machine Series
- Production-Focused Solutions
- End-to-End Technical Support
- Industry-Specific Solutions
- Machine Lifecycle Support
Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Special Purpose Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to specify a machine built to application: component and process, product weight, projected area, number of cavities, plastic material, required clamping force, shot / injection capacity, mould dimensions, production quantity, cycle time and automation requirement.
Download PDFPDF · 265 KB
How to Calculate Clamping Force for an Injection Moulding Machine
A clear methodology that explains how clamping force is calculated, covering projected area, injection pressure, safety factor, number of cavities and material considerations.
Download PDFPDF · 363 KBEngineering Components & Machine Guide
A guide to Engineering components, covering gears, bushings, rollers, bearings, brackets, pneumatic fittings, sprockets and precision mechanical parts. It explains POM, nylon and filled grades, shrinkage, tolerance control, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB
FAQs / Buyer Questions
Common buyer questions on moulding castor and roller wheels.
Which Injection Moulding Machine Is Used to Make Castor Wheels?
It depends on the wheel build. A soft-tread wheel moulded in one cycle needs a special purpose two-shot machine built to application. A single-material wheel is sized to its mould on the E, C or H Series.How Is the Tread Bonded to the Hub?
The TPU or TPE tread is moulded directly onto the hub in the second shot, and the bond depends on the material pair and hub surface. Peel tests on sample wheels confirm it, since datasheet values do not reflect the actual mould.Why Do Thick Wheel Treads Show Sink Marks?
Thick tread sections cool slowly from the inside, so the surface pulls in as the core shrinks. Longer holding pressure and cooling time help, and coring out the hub or tread section where the design allows reduces sink.
Which Material Stops a Wheel From Flat-Spotting?
Flat spots form when a wheel stands under load and the material creeps. Hub and tread compounds are chosen on creep resistance at the rated load, often with POM or PA6 hubs and a harder TPU tread for heavier duty.Can Pratishna Recommend a Machine for My Castor Wheel?
Yes. Share the wheel drawing or sample, hub and tread materials, part weights, mould dimensions, number of cavities and production quantity, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Engineering Parts Too?
Yes. Single-material machines in this range also mould rollers, knobs and handwheels, plastic bearings and conveyor components, subject to the mould and material.
Technical Disclaimer
Disclaimer: The information provided in this webpage is for general informational and educational purposes only. It is based on technical references and industry information available at the time of preparation and may be subject to change. It does not constitute engineering, technical, commercial or professional advice, nor does it constitute a quotation, specification, warranty or contractual commitment by Pratishna Engineers.
Actual injection moulding machine and process requirements vary according to the component design, material, mould, production volume, machine configuration and operating conditions. The information, examples, calculations and recommendations provided should be independently evaluated and verified for the specific application before making any equipment, process or production decision. Information obtained from third-party sources remains subject to the accuracy and limitations of those sources.
Limitation of Liability: Pratishna Engineers makes no representation or warranty, express or implied, regarding the completeness, accuracy or suitability of the information for any particular application. To the extent permitted by applicable law, Pratishna Engineers shall not be liable for any loss, damage, cost or consequence arising from reliance on or use of the information contained in this webpage. Final machine selection, configuration and application suitability should be confirmed with Pratishna Engineers based on complete and accurate project requirements.
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Planning a New Injection Moulding Project?
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