Injection Moulding Machine for Security Seals and Tamper-Evident Locking Devices
Security seals and tamper-evident locking devices are moulded on horizontal injection moulding machines, usually in multi-cavity tools, from PA66, PP or HDPE. Strap length, cavity count and core detail in the locking head decide machine size. A lock that breaks at its set strength and cannot be closed again matters most.
Seal moulding needs steady fill of a long thin strap, careful drying of nylon and repeatable lock geometry in every cavity. Pratishna Engineers supplies horizontal injection moulding machines for security seal production and can recommend a machine once the seal design and output are shared.
Manufacturing Security Seals?
Share the seal design, material, numbering method and cavity plan, and Pratishna Engineers will recommend a machine.
Machine Requirements for Security Seal Moulding
A security seal is sold on break strength and on proof of tampering, so moulding needs:
- Fast fill along long thin straps without short shots
- Lock teeth and jaws moulded sharp and flash-free
- Gating that keeps weld lines out of the lock
- Drying for PA66 to avoid brittle, splayed seals
- Interchangeable mould inserts for moulded-in codes
- Repeatable shot weight so break strength stays even
Recommended Machine for Security Seals
Most security seals are small and light, so the E Series (75-180 T) runs typical seal moulds even with several cavities. Long-strap seals in wide tools, heavier padlock-style seals or high-cavity hot runner moulds suit the H Series (120-350 T). Each seal type is sized from its own mould layout.
Not Sure Which Machine You Need?
Send your seal drawing and numbering method 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
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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 KBIndustrial Packaging Components & Machine Guide
A guide to Industrial Packaging components, covering paint pails, lube containers, jerry-can caps, drum bungs, lids, spouts and dispensing taps. It explains HDPE and PP, leak-free closures, tamper-evident features, mould height, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
Questions logistics suppliers and seal makers ask before choosing a machine.
Which Injection Moulding Machine Is Used to Make Security Seals?
Standard seal moulds usually fit the E Series, chosen by strap length and cavity count. Wider long-strap tools, heavier padlock seals and high-cavity hot runner moulds move up to the H Series.How Is Break Strength Kept Consistent?
Break strength depends on the strap section, the lock geometry and the material condition. Even filling, weld lines kept out of the lock and steady drying of nylon keep every seal breaking within its set range.How Are Serial Numbers Added to Plastic Seals?
Codes can be moulded in through interchangeable mould inserts, or laser-marked after moulding. Inserts suit fixed codes and logos, while laser marking handles sequential serial numbers without changing the mould.
Why Do Nylon Seals Need Drying and Conditioning?
PA66 absorbs moisture, so undried granules give splay and brittle seals. Moulded parts then take up moisture from the air, which changes toughness and break strength, so design and testing use conditioned properties.Can Pratishna Recommend a Machine for My Security Seal?
Yes. Share the seal drawing or sample, material, strap length, numbering method, cavity count, mould size and output target, and Pratishna Engineers will suggest a machine.Does the Machine Suit Other Industrial Packaging Parts Too?
Yes. These machines can also mould pail handle grips, drum bungs, screw caps for lube and chemical bottles and dispensing tap parts, subject to the mould.
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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