Injection Moulding Machine for UPVC and CPVC Threaded Pipe Fittings
UPVC and CPVC threaded pipe fittings such as elbows, tees and couplers are made on horizontal injection moulding machines with a PVC-suited screw and barrel. Clamp size follows the projected area, cavities and the higher cavity pressure PVC needs. Temperature control matters most, as a stall or overheated barrel releases HCl and attacks the screw.
With rigid PVC, machine selection is about barrel protection, accurate zone heating and long holding pressure for thick threaded ends. Pratishna Engineers supplies horizontal injection moulding machines for threaded UPVC and CPVC fittings and can recommend a configuration once the mould is known.
Moulding UPVC and CPVC Fittings?
Share your fitting sizes, thread type, compound and cavity plan, and Pratishna Engineers will recommend a suitable machine.
Machine Requirements for UPVC and CPVC Threaded Fitting Moulding
Rigid PVC is less forgiving than PP or PE, both in the barrel and in the mould. Requirements for threaded fitting work include:
- Nitrided or bimetallic barrel and screw that resist PVC corrosion
- Low-compression screw that avoids shear heating of the melt
- Independent barrel zone heating and cooling for a narrow window
- Higher clamping force per area than PP or PE fittings
- Long holding pressure for thick threaded ends and sockets
- Unscrewing cores or slides for male and female threads
Recommended Machine for UPVC and CPVC Threaded Pipe Fittings
Small elbows, tees and couplers in multi-cavity moulds can run on the E Series (75-180 T). Larger threaded sizes, or moulds carrying more cavities with unscrewing gear, move up to a C Series (140-320 T) machine, or to the H Series (120-350 T) for the heaviest tools. Because PVC fittings are cooling-limited, plan cavities against cycle as well as tonnage.
Not Sure Which Machine You Need?
Share your fitting size range and compound for a PVC-suited 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
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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 KBSanitary & Bathroom Fittings Components & Machine Guide
A guide to Sanitary & Bathroom Fittings components, covering taps, bib cocks, angle cocks, health faucets, showers, cistern fittings, traps and drains. It explains PTMT, POM, ABS and UPVC, leak-free threads and seats, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
Questions plumbing fitting manufacturers ask about moulding rigid PVC threaded fittings.
Which Injection Moulding Machine Is Used to Make UPVC and CPVC Threaded Fittings?
A horizontal machine set up for PVC. The E Series suits smaller threaded fittings, while bigger sizes and higher-cavity moulds go to the C or H Series, always with a screw, barrel and heating suited to rigid PVC.Why Does PVC Need a Special Screw and Barrel?
Rigid PVC breaks down if overheated or held too long, giving off HCl that corrodes steel. A low-compression screw, corrosion-resistant barrel and well-controlled heating zones keep the melt stable and protect the machine.What Is Different About Moulding CPVC?
CPVC runs hotter than UPVC, with an even narrower window between flow and degradation. It needs careful screw speed, back pressure and purging, and hot water fittings must hold their thread form without warpage.
Why Is the Cycle Long on PVC Fittings?
Thick threaded ends need long holding pressure and cooling before ejection, or they shrink and lose thread form. Cooling time, more than injection, usually sets the cycle, so mould cooling design matters as much as machine size.Can Pratishna Recommend a Machine for My UPVC or CPVC Fitting?
Yes. Share the fitting drawing or sample, sizes, compound, part weight, mould dimensions, cavities and output target, and Pratishna Engineers will recommend a machine.Does the Machine Suit Other PVC Plumbing Parts Too?
Yes. With the same PVC-suited setup, it can mould SWR drainage fittings, ball valve bodies, waste couplings and conduit fittings, subject to the mould.
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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