Injection Moulding Machine for Plastic Stools
Plastic stools are moulded on high-tonnage horizontal injection moulding machines, usually one stool per shot, from PP copolymer, HDPE or talc-filled PP. Projected area of the seat plus runners sets the minimum clamping force, with shot weight and mould height close behind. Filling the thin seat rim at the end of a long flow path is the main process risk.
Selection for a stool tool weighs clamping force and injection speed against the stacking design built into the mould. Pratishna Engineers supplies horizontal and two-platen injection moulding machines for smaller stool moulds and can suggest a setup once the seat size and shot weight are known.
Manufacturing Plastic Stools?
Share your stool size, shot weight and mould dimensions, and Pratishna Engineers will suggest a suitable machine.
Machine Requirements for Plastic Stool Moulding
Stools look simple, but a thin seat and stacking legs put specific demands on the press:
- Clamping force covering seat area plus runner and gate
- Fast injection to fill the seat rim before it freezes
- Venting at the rim and leg ends against short shots
- Stacking draft and nesting height built into the tool
- Mould height and opening stroke for a tall stool core
- Stiff copolymer or talc-filled grade for load-bearing seats
Recommended Machine for Plastic Stools
Smaller and children’s stools can fit the H Series (120-350 T), the Two-Platen PHM Series (160-350 T) or the C Series (140-320 T), depending on seat area and mould height. A two-platen machine gives more room for a tall stool mould. Larger stools and bar stools that need more tonnage are discussed on request.
Not Sure Which Machine You Need?
Share your stool mould and seat size for a tonnage check.
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 KBFurniture & Hardware Components & Machine Guide
A guide to Furniture & Hardware components, covering chairs, stools, tables, drawers, storage, hinges, drawer channels, knobs, castors and fittings. It explains large-part moulding, mould height, POM and nylon hardware, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
What stool makers ask most when they plan a new stool tool.
Which Injection Moulding Machine Is Used to Make Plastic Stools?
Stools need high clamping force for their size because the seat is a broad, flat area. Smaller stools can fall within the H, C or PHM range, while tall or large stools may need a bigger press.What Causes Short Shots at the Stool Seat Rim?
The rim is the farthest point from the gate, so thin high-flow PP can freeze before it fills. Faster injection, better venting at the rim, a warmer mould or a gate moved closer can correct it.How Does Stacking Design Affect the Stool Mould?
Stacking draft and nesting height are set in the tool, not added later. Steeper leg draft eases ejection and nesting but changes the look and the load path, so agree it before steel is cut.
Which Test Shows a Stool Is Strong Enough?
Load testing is the acceptance check. A stool can pass a static load and still crack under repeated loading, so agree both tests with your customer and trial the grade and wall design before production.Can Pratishna Recommend a Machine for My Plastic Stool?
Yes. Share the stool drawing or sample, material, shot weight, mould dimensions and daily output, and Pratishna Engineers will suggest a suitable machine and clamping force.Does the Machine Suit Other Furniture Parts Too?
Yes. Depending on mould size, the same machines can mould plastic drawers, modular storage bins, storage crate lids and furniture legs and glides.
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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