Injection Moulding Machine for Extension Board Bodies and Covers
Extension board bodies and covers are made on horizontal injection moulding machines, from flame-rated ABS, PC/ABS, PC or FR PP, often with a hot runner or several gates. Board length and mould size set the machine more than clamp force does. Flow length against wall thickness is the main limit, since the housing is long and thin.
Selection for extension boards looks at injection speed and pressure to fill a long thin shell, plus platen size for long moulds. Pratishna Engineers supplies horizontal injection moulding machines for extension board bodies and covers and can recommend a configuration for your board length and socket count.
Manufacturing Extension Boards?
Share the body and cover drawings, grade and socket count, and Pratishna Engineers will suggest a suitable machine.
Machine Requirements for Extension Board Moulding
An extension board is a long housing around a live busbar, so filling and flame rating come first. What to check:
- Injection capacity to fill long thin walls without short shots
- Hot runner or several gates along the board length
- Flame-rated grade wherever the busbar runs
- Screw bosses cored and gusseted to stop sink outside
- Weld lines kept away from socket openings and snap hooks
- Platen and tie-bar space for long moulds
Recommended Machine for Extension Boards
Most board bodies and covers, with their long moulds, sit on the C Series (140-320 T). The longest boards, deeper bodies with switch and indicator pockets, or body and cover in one family mould suit the H Series (120-350 T). Short boards and small covers or switch caps can run on the E Series (75-180 T).
Not Sure Which Machine You Need?
Send your board length, mould size and gating plan for a machine proposal.
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
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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 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
Common questions from extension board and spike guard makers.
Which Injection Moulding Machine Is Used to Make Extension Boards?
Long bodies and covers are commonly run on the C Series, with the H Series for the longest boards or family moulds. Short boards and small loose parts can go on the E Series.Why Does Flow Length Limit an Extension Board More Than Clamp Force?
The shell is long with thin walls, so melt cools before it reaches the far end. Fill pressure and speed run out before clamp force does, which is why a hot runner or extra gates are planned.How Is Sink Avoided Over Screw Bosses?
Bosses on the inside of a cosmetic outer wall telegraph sink through the face. Coring the boss, adding gussets, keeping its wall thinner than the shell and holding pressure long enough avoid it.
Which Flame-Rated Grade Suits an Extension Board?
FR ABS and PC/ABS are common for bodies and covers, with PC where more impact strength is wanted and FR PP for lower-cost boards. The grade must carry its flame rating at the moulded wall thickness.Can Pratishna Recommend a Machine for My Extension Board?
Yes. Share the body and cover drawings or samples, grade, part weights, mould size, gating plan and monthly volume, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Electrical Housings Too?
Yes, subject to the mould. Similar machines run stabiliser housings, UPS housings, electricity meter boxes and distribution board enclosures.
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?
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