Injection Moulding Machine for Concealed Flush Tanks and Cisterns
Concealed flush tanks and cisterns are produced on horizontal injection moulding machines as deep, ribbed mouldings in HDPE or PP, with ABS for exposed parts. Mould height, opening stroke for the tank depth and the projected area of the body set the machine size. Even cooling of the long core keeps wall thickness steady.
With a cistern, machine choice centres on daylight and stroke for the deep mould, enough shot capacity for the full tank and steady holding pressure on the ribs. Pratishna Engineers supplies horizontal injection moulding machines for flush tank moulding and can recommend a configuration for your tank and mould.
Moulding Flush Tanks?
Share your tank drawing, material, part weight and mould size, and Pratishna Engineers will recommend a machine.
Machine Requirements for Flush Tank and Cistern Moulding
A concealed cistern sits inside the wall for years, so it must stay leak-free and hold its shape. Points to check when selecting a machine:
- Mould height and opening stroke for a deep tank
- Shot capacity for the full tank weight in one shot
- Uniform wall thickness so the tank body does not warp
- Ribs packed out without sink on sealing faces
- Core pulls for inlet, outlet and mounting bosses
- Ejection that frees a deep tank without stress whitening
Recommended Machine for Flush Tanks and Cisterns
Cistern size decides the series. Smaller tanks, lids and covers can run on the E Series (75-180 T). Full-size concealed tank bodies need more shot capacity, mould height and stroke, which the C Series (140-320 T) and H Series (120-350 T) cover. Very large tanks are checked against the mould before a machine is proposed.
Not Sure Which Machine You Need?
Share your tank size and mould dimensions to get a machine matched to them.
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 KBBuilding & Construction Components & Machine Guide
A guide to Building & Construction components, covering plumbing fittings, switch plates, junction boxes, wall plugs, cable ties, cisterns and toilet seats. It explains PVC, nylon, PP and ABS processing, high-cavity moulds for small fixings, and how to match each part to a suitable machine.
Download PDFPDF · 215 KB
FAQs / Buyer Questions
Questions buyers ask when planning cistern production.
Which Injection Moulding Machine Is Used to Make Flush Tanks?
A horizontal machine chosen for its mould space as much as its tonnage. Smaller cisterns may suit the E Series, while full concealed tank bodies usually move to the C or H Series for daylight and stroke.What Mould Height and Opening Stroke Does a Cistern Need?
The opening stroke has to be roughly twice the tank depth, plus room to take the moulding out clear of the core. Mould height follows from that depth and the plates behind it. Both are checked before tonnage is fixed.Which Material Suits a Concealed Cistern Tank?
HDPE and PP take water, impact and site handling well and suit tanks hidden in the wall. ABS gives a harder, glossier surface for exposed cisterns and covers. The material also sets shrinkage, which the mould is cut for.
Are All Concealed Cisterns Injection Moulded?
No. Some concealed cisterns are blow moulded in one piece, which is a different process. This page covers injection moulded tanks, lids and covers, where ribs, bosses and mounting points are moulded in.Can Pratishna Recommend a Machine for My Flush Tank?
Yes. Share the tank drawing or sample, material, part weight, tank depth, mould dimensions, core pulls and yearly volume, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Bathroom and Sanitary Parts Too?
Yes. Machines in this range can mould toilet seats and covers, floor drains and traps, bathroom fittings and bathroom accessories, subject to mould size.
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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