Injection Moulding Machine for Relay Housings
Relay housings are produced on horizontal injection moulding machines in multi-cavity moulds, using glass-filled or flame-retardant PBT, PA66 or PA6. Tonnage is driven by the cavity count and the combined projected area, with shot weight staying small. Keeping the deep cover walls even matters most, because core shift makes one side thin.
Relay housing machine selection is about repeatable small shots across many cavities and steady drying of PBT or nylon. Pratishna Engineers supplies horizontal injection moulding machines for relay housing and base moulding and can recommend a configuration for your relay design and cavity plan.
Moulding Relay Housings?
Send your relay cover and base drawings, material and cavity plan, and Pratishna Engineers will recommend a machine.
Machine Requirements for Relay Housing Moulding
Relay covers are small, deep boxes and bases carry terminal holes, so the process has to hold size in every cavity:
- Shot control for small parts in multi-cavity moulds
- Drying of PBT, PA66 and PA6 to stop splay
- Even wall thickness on deep covers without core shift
- Venting at the closed end to stop air traps
- Ejection of deep box shapes without stress whitening
- Wear-resistant screw for glass-filled relay grades
Recommended Machine for Relay Housings
Relay housings are light parts, and many cover and base moulds run on the E Series (75-180 T). Moulds with a high cavity count, a hot runner or covers and bases together in one tool can need the H Series (120-350 T) or the C Series (140-320 T) for clamping force and platen space.
Not Sure Which Machine You Need?
Share your relay housing and mould details to receive 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
- 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
Common questions from relay and switchgear part moulders.
Which Injection Moulding Machine Is Used to Make Relay Housings?
A small horizontal machine in the E Series handles many relay housing tools. Bigger series are chosen when the cavity count or a combined cover and base mould raises the clamping force needed.Why Do Relay Covers Come Out With One Thin Wall?
The long core forming the inside of the cover can be pushed sideways by melt pressure. Gating at the centre of the top, a well supported core and balanced filling keep the walls even.Should PBT and Nylon Be Dried Before Moulding?
Yes. PBT can lose strength through hydrolysis if moulded wet, and nylon shows splay and brittle parts. Dry to the resin supplier figures and keep the hopper covered or fed from the dryer.
Can Terminals Be Moulded Into the Relay Base?
Some bases are moulded around metal terminals placed in the mould as inserts. That needs precise insert location, careful sealing of the pins in the tool to avoid flash, and loading time in the cycle.Can Pratishna Recommend a Machine for My Relay Housing?
Yes. Share drawings or samples of the cover and base, material grade, part weight, cavities, any inserts and target output, and Pratishna Engineers will suggest a suitable machine.Does the Machine Suit Other Small Automotive Housings Too?
Yes. Depending on the mould, the same machine can mould fuse boxes, sensor housings, automotive connectors and battery terminal covers.
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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