Injection Moulding Machine for Compression Fittings
Compression fittings are made on horizontal injection moulding machines as separate parts: a PP body and nut, a POM split grip ring and a rubber O-ring fitted later. Thread forming, cavity count and body size decide each machine. Thread fit between body and nut matters most, because the nut drives the ring onto the pipe.
With compression fittings, selection usually covers two or three machines, one for bodies and nuts and a smaller one for rings. Pratishna Engineers supplies horizontal injection moulding machines for compression fitting parts and can lay out the machine sizes for your range.
Manufacturing Compression Fittings?
Tell Pratishna Engineers your fitting sizes, part list, materials and volumes to receive a machine recommendation and quotation.
Machine Requirements for Compression Fitting Moulding
Three parts in two materials, each with its own mould, shape the machine plan for compression fittings:
- Unscrewing cores for internal threads in the nut
- Slides or unscrewing action for body threads
- Small, repeatable shots for POM split grip rings
- Dedicated barrel for POM, kept apart from PVC
- Cooling and hold control for thread size repeatability
- Clamping force for multi-cavity nut and body moulds
Recommended Machine for Compression Fittings
Grip rings and small nuts are light parts that suit the E Series (75-180 T), often in many-cavity moulds. Bodies and nuts for larger pipe sizes move to the C Series (140-320 T) for more shot weight. Bigger moulds with unscrewing drives can also use the H Series (120-350 T). Plants making a full range often keep body, nut and ring moulds on separate machines.
Not Sure Which Machine You Need?
Share your body, nut and ring moulds for a matched machine plan.
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 KBPVC Pipes & Fittings Components & Machine Guide
A guide to PVC Pipes & Fittings components, covering elbows, tees, couplers, valves, end caps, saddles and threaded adaptors. It explains PVC-suited screw and barrel, core pulls and unscrewing moulds, sizing by pipe diameter, and how to match each part to a suitable machine.
Download PDFPDF · 218 KB
FAQs / Buyer Questions
Questions our engineers hear from compression fitting makers.
Which Injection Moulding Machine Is Used to Make Compression Fittings?
Horizontal machines, sized part by part. Rings and small nuts run on the E Series, while bodies and nuts for bigger pipes may need the C or H Series. The largest body mould sets the biggest machine in the line.Why Must POM and PVC Never Share a Barrel?
POM and PVC react when mixed hot, and the breakdown can be violent and give off gas. Plants keep separate machines, or purge fully with PP or PE between them. POM grip rings are usually run on a machine that never sees PVC.How Are the Nut Threads Formed?
The nut’s internal thread is moulded on a rotating core that unscrews before ejection. A gear drive or hydraulic motor turns the core, while ribs or flats on the outside of the nut hold it in the cavity.
Does the Grip Ring Need Special Moulding Care?
The POM ring is thin and slit, with teeth that bite the pipe. Sharp teeth need full fill and good venting, and POM’s high shrinkage means mould temperature and hold time must stay steady to keep the ring size.Can Pratishna Recommend a Machine for My Compression Fitting?
Yes. Share drawings of the body, nut and ring, pipe sizes, materials, part weights, mould dimensions, cavities and monthly volume, and Pratishna Engineers will recommend suitable machines.Does the Machine Suit Other Plumbing Fitting Parts Too?
Yes. Threaded adaptors, tank connectors, pipe joints and end caps can run on the same machines, depending on mould size and thread actions.
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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