Injection Moulding Machine for Case Latches, Hinges and Catches
Hard case latches, hinges and catches are moulded on horizontal injection moulding machines, in glass-filled nylon where they carry load, POM where they slide and ABS for covers. Part size, cavities and slides for pin holes decide the machine. Moisture uptake in nylon matters most, since latch fit has to be set at conditioned size.
Latches and hinges sit on the load path between the case shells, so selection looks at fibre-filled moulding, drying and stable dimensions. Pratishna Engineers supplies horizontal machines for case hardware and can recommend a configuration from your parts and moulds.
Manufacturing Case Latches and Hinges?
Share your latch and hinge drawings, materials and volumes, and Pratishna Engineers will suggest the right machine.
Machine Requirements for Case Latch and Hinge Moulding
Hard cases tend to fail where the shell load enters the latch or hinge, so these parts need strength as well as a repeatable fit. Requirements:
- Wear-resistant screw and check ring for glass-filled nylon
- Dryer sized for nylon before moulding
- Gate and fibre direction set along the latch load path
- Slides for hinge pin bores and latch pockets
- Gauging to conditioned nylon size, not dry-as-moulded
- PP living-hinge catches flexed straight after ejection
Recommended Machine for Case Latches and Hinges
Most latch, catch and small hinge moulds fit the E Series (75-180 T). Larger hinges for big cases, family tools or moulds with several slides may need the H Series (120-350 T) or C Series (140-320 T), chosen by mould size and projected area.
Not Sure Which Machine You Need?
Send your latch or hinge part and mould size 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 KBLuggage & Bags Components & Machine Guide
A guide to Luggage & Bags components, covering trolley parts, spinner wheels, buckles, zipper sliders, handle grips, lock housings and case latches. It explains POM, nylon and PP, two-material parts, wear resistance, and how to match each part to a suitable machine.
Download PDFPDF · 206 KB
FAQs / Buyer Questions
Questions hard case makers ask about latches, hinges and catches.
Which Injection Moulding Machine Is Used to Make Case Latches and Hinges?
Horizontal machines sized to the part. Most latches and catches run on the E Series, while larger hinges, family tools or moulds with several slides move to the C or H Series.Why Does Latch Fit Change After Moulding?
Nylon absorbs moisture from the air after moulding and grows slightly. If the latch is gauged dry, the fit drifts once it conditions, so parts should be designed and checked at conditioned dimensions.How Is a Case Latch Tested?
With a fatigue test that opens, closes and loads the latch many times, rather than a single static pull. Failures start where load passes from the case shell into the latch, so fibre direction there matters.
Can a Catch Be Moulded With a Living Hinge?
Yes, if the catch is moulded in PP. The thin hinge section should be flexed straight after ejection, while still warm, so it does not crack in use. PP is the usual material for this.Can Pratishna Recommend a Machine for My Case Latch?
Yes. Share the latch, hinge and catch drawings or samples, materials, part weights, mould dimensions, cavities and monthly volume, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Hard Case Parts Too?
Yes. Similar machines can make small carry case bodies, luggage lock housings, trolley components and corner protectors, subject to the 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.
Talk to Our Engineers
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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