Injection Moulding Machine for Safety Spectacle Frames and Temples
Safety spectacle frames, temples and side shields are made on horizontal injection moulding machines from PC or TR90 nylon, with TPE nose pads and temple tips often two-shot. Small part size, cavity count and the soft overmould decide the machine. Material choice matters most, since the frame must pass high-velocity impact tests.
Machine selection for spectacle frames focuses on small, accurate shots, dry PC and nylon, and a clean TPE bond at the nose and temple. Pratishna Engineers builds two-shot machines to application as special purpose machines, offers horizontal machines for frames without the soft overmould, and can suggest a set-up for your range.
Manufacturing Safety Spectacle Frames?
Share your frame, temple and side shield designs with materials and volume, and Pratishna Engineers will recommend a machine.
Machine Requirements for Safety Spectacle Frame Moulding
Spectacle frames are small parts where impact rating, fit and the soft-touch overmould count for more than tonnage. Points for the machine:
- Small, repeatable shots for frame and temple tools
- Thorough drying of PC and TR90 before moulding
- Strong TPE nose pad and temple tip overmould bond
- Weld lines kept away from hinge and bridge sections
- Hinge bores and temple fits held cavity to cavity
- Gloss or texture finish with no gate mark on faces
Recommended Machine for Safety Spectacle Frames
Frames, temples and side shields are small, so most single-material moulds sit well within the E Series (75-180 T), with the C Series (140-320 T) for high-cavity hot runner tools and H Series (120-350 T) for large family tools. A frame with TPE pads or tips moulded on in the same cycle needs a machine built to application, and Pratishna Engineers builds such special purpose machines.
Not Sure Which Machine You Need?
Send your spectacle frame drawings and materials for a machine suggestion.
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 KBIndustrial Safety & PPE Components & Machine Guide
A guide to Industrial Safety & PPE components, covering goggles, face shields, respirator parts, spectacle frames, hard hat harnesses, ear defenders and valve components. It explains optical PC, soft-touch parts, sealing faces, and how to match each part to a suitable machine.
Download PDFPDF · 202 KB
FAQs / Buyer Questions
Answers to the points eyewear moulders check first when they plan a safety frame line.
Which Injection Moulding Machine Is Used to Make Safety Spectacle Frames?
Single-material frames, temples and side shields usually run on the E Series because the parts are small. Large family tools may use the C or H Series. Frames with a two-shot TPE overmould need a special purpose machine.Why Are PC and Nylon Used for Safety Spectacle Frames?
Impact rating drives the choice. PC and TR90 nylon take the high-mass and high-velocity impact tests where softer resins crack. Dry both fully before moulding to avoid splay marks and brittle hinge sections.Can Nose Pads and Temple Tips Be Moulded On?
Yes. TPE pads and tips are often overmoulded onto the rigid core, either two-shot on a special purpose machine or by transferring the core into a second tool. Check the bond after ageing, as peeling pads cause complaints.
Is the Lens Part of the Frame Moulding?
No. The lens is a separate optical part with its own optical class requirement, moulded or bought in separately. Approval covers the complete spectacle, so the frame moulder works to the same test regime as the brand.Can Pratishna Recommend a Machine for My Safety Spectacle Frame?
Yes. Share frame, temple and side shield drawings or samples, materials, overmould plan, part weights, mould sizes, cavities and monthly volume, and Pratishna Engineers will recommend a machine.Does the Machine Suit Other Eye Protection Parts Too?
Yes. Similar machines mould safety goggles frames, face shield headgear, visor clamp and pivot parts, and welding helmet ADF cartridge housings, subject to mould size.
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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