Injection Moulding Machine for Electric Plug Tops (Two-Pin and Three-Pin)
Electric plug tops with moulded-in brass pins are made on vertical insert moulding injection moulding machines, from PA66, PC or PP, and from PVC where the plug is moulded onto a cord. Pin count, cavities and insert loading time set the machine. Pin alignment matters most, because spacing and projection are fixed by the plug standard.
For plug tops, selection centres on how the pins are held in the mould and how cleanly the melt packs around the pin roots. Pratishna Engineers supplies vertical injection moulding machines for insert-moulded plug tops, plus horizontal machines for rewireable tops, and can recommend a configuration.
Manufacturing Plug Tops?
Share the plug type, pin inserts, grade and cavity plan, and Pratishna Engineers will recommend a machine.
Machine Requirements for Plug Top Moulding
A plug top with moulded-in pins is an insert moulding job, and the pins decide most of the set-up. Look for:
- Vertical clamp so pins sit in the lower half by gravity
- Pin holders that keep spacing true under injection pressure
- No voids or short shots around the pin roots
- Stable shrinkage so pin positions stay within the standard
- Dried PA66 and PC to avoid splay and brittle bodies
- Shuttle or rotary table to load pins during the cycle
Recommended Machine for Plug Tops
Insert-moulded plug tops suit the Vertical PVDL Series (40-80 T), where pins are loaded into an open lower mould between shots. E Series (75-180 T) runs rewireable plug bodies and covers with pins fitted after moulding. H Series (120-350 T) suits larger multi-cavity tools for covers or plug bodies with more cavities.
Not Sure Which Machine You Need?
Send your plug drawing and pin insert details for a machine suggestion.
Why Choose Pratishna Engineers?
- Application-Based Machine Selection
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- Multiple Machine Series
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Injection Moulding Machine Buyer Resources
Download practical resources to help you select, size and specify the right machine.
Vertical Injection Moulding Machine Selection Guide
A step-by-step guide covering the key inputs needed to select the right machine: product weight, insert type and loading method, 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 KBElectrical & Electronics Components & Machine Guide
A guide to Electrical & Electronics components, covering switches, sockets, MCB and RCCB housings, plug tops, meter boxes, solar connectors and electronic housings. It explains flame-retardant and glass-filled grades, thermoset parts, dimensional control, and how to match each part to a suitable machine.
Download PDFPDF · 202 KB
FAQs / Buyer Questions
What plug makers ask when moving to insert-moulded pins.
Which Injection Moulding Machine Is Used to Make Plug Tops?
Plug tops with pins moulded in usually run on vertical presses such as the PVDL Series. Rewireable tops and covers, with pins fitted later, run on horizontal E Series or, for larger multi-cavity tools, H Series machines.Why Use a Vertical Machine for Plug Pins?
Brass pins drop into the open lower mould and stay in place by gravity while the mould closes. On a vertical press, a shuttle or rotary table lets one half be loaded while the other moulds.What Causes Pin Spacing to Go Out of Specification?
A shrinkage shift after a grade, colour or mould temperature change can move the pins. Since pin spacing and projection are set by the plug standard, this is a rejection rather than a cosmetic fault, so the process is locked once approved.
Why Are Voids Around the Pin Root a Problem?
A void or short shot where the pin leaves the body traps dirt and moisture, which is where tracking starts. Proper gating, venting near the pins and enough holding pressure pack that area. Urea plug tops are thermoset and use another process.Can Pratishna Recommend a Machine for My Plug Top?
Yes. Share the plug drawing or sample, pin insert details, grade, part weight, mould size, cavities and monthly volume, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Wiring Accessory Parts Too?
Yes, subject to the mould. Similar machines run socket outlet bodies, extension board covers, cable accessories such as junction connectors, and electronic connectors.
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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