Injection Moulding Machine for Automotive Junction Boxes
Automotive junction boxes are moulded on horizontal injection moulding machines from glass-filled PA66 or PBT for the housing, with PP often used for covers. Machine size depends on the housing footprint, mould slides for wire exits and the shot weight of thick mounting areas. Flatness of the sealing face matters most, since glass fibre can cause warpage.
For junction boxes, machine choice weighs platen space for slide-heavy moulds and clamping force for the full housing. Pratishna Engineers supplies horizontal injection moulding machines for automotive junction box housings and covers, and can recommend a configuration for your design and tool.
Manufacturing Automotive Junction Boxes?
Share the housing and cover drawings, material, sealing design and mould size, and Pratishna Engineers will recommend a machine.
Machine Requirements for Automotive Junction Box Moulding
A junction box protects wiring under the bonnet or inside the cabin, so the housing must seal, mount firmly and hold its shape:
- Flat sealing groove that holds its shape after cooling
- Gate layout that controls glass fibre orientation and warp
- Platen space for slides at wire exits and latches
- Clamping force for upper housing, lower housing or cover
- Dried PA66 or PBT for strong latches and bosses
- Brass insert bushes at bolt points where specified
Recommended Machine for Automotive Junction Boxes
Compact junction boxes and their covers can often be moulded on the E Series (75-180 T). Main power distribution housings with wide footprints and several slides usually need a C Series (140-320 T) machine, or an H Series (120-350 T) one where the slides widen the mould. Larger housings beyond these sizes are reviewed on request.
Not Sure Which Machine You Need?
Send the junction box drawings and mould layout 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 KBAutomotive Components & Machine Guide
A guide to Automotive components, covering connectors, clips, lamp lenses, battery containers, two-wheeler panels and EV parts. It explains engineering plastics and glass-filled grades, cosmetic surfaces, mould size, and how to match each part to a suitable machine.
Download PDFPDF · 223 KB
FAQs / Buyer Questions
Questions junction box suppliers ask when planning a new machine.
Which Injection Moulding Machine Is Used to Make Automotive Junction Boxes?
A horizontal machine chosen by housing size and mould width. Covers and small boxes may suit the E Series, and main housings with slides often go to the C or H Series.How Is the Sealing Face Kept Flat?
Glass fibres shrink less along the flow than across it, so a flat face can bow. Gate placement that gives even fibre orientation, uniform walls, balanced mould cooling and correct holding pressure keep the seal groove flat.Can the Junction Box Cover Be Moulded in PP?
Yes, many covers that need no high heat or stiffness are moulded in PP, often with a living hinge or snap latches. The housing that carries terminals usually stays in glass-filled PA66 or PBT.
Do Wire Exits and Latch Windows Change the Mould Size?
Yes. Each exit or window can need a slide, and slides make the mould wider and taller. Tie-bar spacing and opening stroke then set the machine size as much as tonnage.Can Pratishna Recommend a Machine for My Junction Box?
Yes. Share drawings or samples for the housing and cover, material grades, part weights, mould dimensions with slides and annual volume, and Pratishna Engineers will advise.Does the Machine Suit Other Vehicle Wiring Parts Too?
Yes. Depending on the mould, it can also produce fuse boxes, relay housings, automotive connectors and EV charging gun housings.
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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