Injection Moulding Machine for Spectacle Cases and Covers
Spectacle cases and covers are made on horizontal injection moulding machines from PP, ABS or PC, as two shell halves or a one-piece body with a moulded hinge. Case size, cavity count and mould depth set the machine. What decides acceptance is the cosmetic outer face, where sink over hinge bosses and clip mounts is the usual reject.
Machine selection for cases weighs mould depth and opening stroke, cooling for flat shell faces and steady gloss across cavities. Pratishna Engineers supplies horizontal injection moulding machines for spectacle case production and can recommend a configuration for your case design.
Manufacturing Spectacle Cases?
Share your case design, hinge type, material and monthly volume, and Pratishna Engineers will recommend a machine and quotation.
Machine Requirements for Spectacle Case Moulding
Cases sell on their look and on a lid that keeps closing after months of use. Points for the machine and mould:
- Opening stroke for deep shells and clean ejection
- PP living hinge flexed straight after ejection
- Sink-free cosmetic face over bosses and clip mounts
- Even cooling so the halves close without gaps
- Gloss or texture held across cavities and lots
- Hinge pin and snap fit dimensions held repeatably
Recommended Machine for Spectacle Cases
Spectacle cases are mid-sized parts with some depth. The E Series (75-180 T) suits most case and lid moulds. Larger hard cases, multi-cavity tools or family moulds carrying body and lid together go to the C Series (140-320 T), or to the H Series (120-350 T) where mould height and opening stroke need more room.
Not Sure Which Machine You Need?
Send your case drawing and finish 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.
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
Questions eyewear brands and case makers ask before choosing a moulding machine.
Which Injection Moulding Machine Is Used to Make Spectacle Cases?
Most case tools run on the E Series. Pratishna Engineers would look at the C or H Series where the case is large, the mould is deep, or body and lid share a family mould.Which Material Suits a Hinged Spectacle Case?
A one-piece case with a moulded living hinge needs PP, flexed soon after ejection while the hinge is still warm. ABS and PC cases are moulded as two halves joined by a pin or snap hinge.Can a Spectacle Case Have a Soft-Touch Finish?
Yes. A TPE soft-touch layer can be overmoulded onto the shell, which is a two-material process planned on enquiry. Other routes are a separate TPE part fitted after moulding, or in-mould decoration on the shell.
Why Do Case Halves Gap When Closed?
Uneven cooling between core and cavity bows the shell, so the halves open slightly at the ends. Balanced cooling channels, gate position and enough cooling time keep the rims straight.Can Pratishna Recommend a Machine for My Spectacle Case?
Yes. Share the case drawing or sample, material, hinge type, finish, mould size, cavity count and monthly quantity, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Eyewear Parts Too?
Yes, depending on the mould. Spectacle frames, temple tips and nose pads, and sunglass lenses are related parts on the same class of machine.
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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