Injection Moulding Machine for Spectacle Frames
Spectacle frames in TR90-type polyamide, PA12 or PC are made on horizontal injection moulding machines, with fronts and temples often in separate moulds. Machine size depends on front width, cavity count and runner length. Cooling is the process point to watch: it sets crystallinity in TR90, which decides the flexibility and shape memory of the frame.
Selection for frames centres on fill control for thin temple sections, accurate mould temperature and gentle ejection of a flexible part. Pratishna Engineers supplies hybrid and horizontal injection moulding machines suited to frame production and can recommend a configuration for your frame design and volume.
Manufacturing Spectacle Frames?
Share your front and temple drawings, material and monthly volume, and Pratishna Engineers will recommend a machine and quotation.
Machine Requirements for Spectacle Frame Moulding
Frames are judged on fit, flex and colour as much as on looks. Machine and mould points to confirm:
- Steady flow so thin temples fill without hesitation marks
- Controlled cooling to keep TR90 flexibility and shape memory
- Ejection layout that does not bend soft temples
- Front flatness and warp held across long runs
- Lens groove dimensions repeatable from cavity to cavity
- Colour matched between lots with consistent masterbatch dosing
Recommended Machine for Spectacle Frames
Frame fronts and temples are small parts, but long runners and family layouts add to the shot. Most frame moulds fit the E Series (75-180 T), with the Hybrid PH Series (120-140 T) where electric injection helps thin temples fill evenly. Larger family tools and multi-cavity temple moulds are placed on the H Series (120-350 T) or C Series (140-320 T).
Not Sure Which Machine You Need?
Share your frame drawings and colour range 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.
Horizontal Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: 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 KBOptical Components & Machine Guide
A guide to Optical components, covering precision lenses, spectacle frames, light guides, thick-wall lenses, visor lenses, lens barrels and fibre connector housings. It explains optical PC and PMMA, drying, flow line control, and how to match each part to a suitable machine.
Download PDFPDF · 208 KB
FAQs / Buyer Questions
What frame makers and eyewear brands ask before they buy a moulding machine.
Which Injection Moulding Machine Is Used to Make Spectacle Frames?
A horizontal machine in the lower tonnage band covers most frame tools. Pratishna Engineers usually proposes the Hybrid PH or E Series, and the C or H Series for multi-cavity temple moulds.Can Acetate Frames Be Injection Moulded?
No. Acetate frames are cut from layered sheet and finished by hand, so an acetate design is not a moulding job. TR90, PA12 and PC frames are injection moulded, which is where their cost advantage comes from.Does TR90 Need Drying Before Moulding?
Yes. TR90 and other polyamides take up moisture, which causes splay, brittle temples and size drift. Dry the granules to the supplier’s conditions and feed the dried material straight to the hopper.
Why Do Frame Fronts Warp After Moulding?
Front warp usually comes from uneven cooling between the bridge and the rims, or from a gate that packs one side harder. Balanced cooling, gate position and enough cooling time before ejection keep the front flat for lens fitting.Can Pratishna Recommend a Machine for My Spectacle Frame?
Yes. Share the front and temple drawings or samples, material grade, colours, cavity layout, mould size and monthly quantity, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Eyewear Parts Too?
Yes, within the mould limits. Related eyewear parts include temple tips, nose pads and hinge covers, spectacle cases, and sunglass and safety lenses.
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?
Share your component, material, mould and production target. Our engineering team will help you identify the right machine configuration.
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