Injection Moulding Machine for File and Folder Clips
File and folder clips are produced on horizontal injection moulding machines in multi-cavity moulds, from PP copolymer for living-hinge clips and POM or PA6 for stiffer spring parts. Cavity count and clip size set the machine. On living-hinge designs the hinge decides the part: it must be gated so flow crosses it and flexed straight after ejection.
Machine selection for file clips depends on whether the spring is a moulded hinge or an assembled steel spring, since the two are different parts and quotes. Pratishna Engineers supplies horizontal injection moulding machines for file clip production and can recommend a configuration for your clip and mould.
Moulding File Clips?
Share your clip drawing or sample, spring type, material and output, and Pratishna Engineers will recommend a suitable machine.
Machine Requirements for File and Folder Clip Moulding
Only the clip and its mechanism are mouldings, since folder bodies are cut from sheet or board. Points to check when selecting a machine:
- Living hinge gated so melt crosses it in one direction
- No weld line at the hinge or spring arm
- Hinge flexed right after ejection while still warm
- POM spring arms with stable shrinkage and stiffness
- Dried PA6 for clips that must not turn brittle
- Prongs that pass cleanly through punched paper holes
Recommended Machine for File and Folder Clips
File clips are small, so tonnage follows the number of cavities and the mould frame. The E Series (75-180 T) suits many clip and fastener moulds. Longer clip bars, high-cavity tools or family moulds for the clip and its mechanism may need the H Series (120-350 T) or the C Series (140-320 T).
Not Sure Which Machine You Need?
Send your clip drawing and spring type 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 KBStationery Components & Machine Guide
A guide to Stationery components, covering pen barrels, caps, refills, markers, rulers, sharpeners, clips, ID card holders and desk tools. It explains high-cavity hot runner moulds, clear parts, small mechanisms, and how to match each part to a suitable machine.
Download PDFPDF · 204 KB
FAQs / Buyer Questions
What file and folder clip buyers ask most often.
Which Injection Moulding Machine Is Used to Make File Clips?
Horizontal machines matched to the clip mould. Small clip and fastener tools often run in the E Series, and longer clip bars or tools with many cavities may move to the C or H Series.Should the Clip Use a Living Hinge or a Steel Spring?
A living hinge in PP copolymer gives a one-piece part with no assembly. A steel spring clip needs a moulded body plus spring fitting, so the two are quoted differently. Hinge life depends on gating and grade.How Is a Living Hinge Moulded So It Does Not Crack?
Gate so the melt crosses the hinge in one direction, with no weld line there, and keep the hinge section even. Flexing the hinge straight after ejection, while it is still warm, sets the orientation that gives long hinge life.
Which Parts of a File or Folder Are Moulded?
Only the clip and its mechanism. Folder bodies, box files and display book spines are die-cut or fabricated from extruded PP sheet or board, and lever-arch mechanisms are steel.Can Pratishna Recommend a Machine for My File Clip?
Yes. Share the clip drawing or sample, spring type, material, part weight, mould size, number of cavities and required output, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Stationery Parts Too?
Yes. The same machines can mould clipboard and display book fittings, ID card holder frames, badge reel clips and sharpener bodies, 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.
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.
- Machine Sales
- +91 99690 38542
- Service Support
- +91 97689 28259
- Sales Email
- [email protected]