Injection Moulding Machine for Thin-wall Square Containers and Tubs
Thin-wall square containers and tubs are moulded on horizontal injection moulding machines using single or multi-cavity hot runner tools, from PP copolymer or IML-grade PP. Cavity count and projected area set tonnage, while flow length against wall thickness sets the injection speed and pressure needed. Corner filling matters most for this shape.
Thin-wall work puts injection speed, injection pressure and a short dry cycle ahead of raw clamp size. Pratishna Engineers offers horizontal injection moulding machines for square tub production and can recommend a set-up once the wall, flow length and cavity plan are known.
Manufacturing Square Tubs?
Share the tub drawing, wall thickness, cavity plan and decoration method, and Pratishna Engineers will suggest a machine.
Machine Requirements for Thin-wall Square Tub Moulding
A thin square tub fills from the base gate out to four distant corners, so the machine needs:
- Fast injection to reach corners before the wall freezes
- High injection pressure for long thin flow paths
- Short dry cycle for quick mould open and close
- Rapid even cooling of thin walls and base
- Corner radii and ribs that ease filling and stress
- Clean ejection of thin walls without stress whitening
Recommended Machine for Thin-wall Square Tubs
Smaller square tubs in multi-cavity tools can run on the E Series (75-180 T). Mid-size tubs and higher cavities move to the C Series (140-320 T). Larger tubs and tools at the top of the range go on the H Series (120-350 T). Check injection speed and pressure as closely as tonnage for thin walls.
Not Sure Which Machine You Need?
Send the tub drawing and wall thickness for 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
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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 KBIndustrial Packaging Components & Machine Guide
A guide to Industrial Packaging components, covering paint pails, lube containers, jerry-can caps, drum bungs, lids, spouts and dispensing taps. It explains HDPE and PP, leak-free closures, tamper-evident features, mould height, and how to match each part to a suitable machine.
Download PDFPDF · 203 KB
FAQs / Buyer Questions
Common questions from makers of square tubs for industrial and retail fills.
Which Injection Moulding Machine Is Used to Make Thin-wall Square Tubs?
The E Series suits smaller tubs, the C Series mid-size tubs and higher cavities, and the H Series larger tubs. For thin walls a machine is judged on fill speed and pressure as well as clamp tonnage.Why Do Square Tubs Crack or Short Shot at the Corners?
Corners are the furthest point from the gate and the thinnest flow path, so melt arrives last and coolest. Sharp corners also concentrate stress. Corner radii, ribs and correct venting reduce both faults.How Thin Can the Wall of a Square Tub Be?
It depends on flow length, material flow grade and the injection speed and pressure available. Thinner walls save material but raise the demand on machine and mould, so wall and machine are decided together.
Can Square Tubs Carry In-Mould Labels?
Yes, IML-grade PP is used for labelled tubs. Four flat sides suit wrap-around or side labels, and the mould and label robot are designed for IML from the start.Can Pratishna Recommend a Machine for My Square Tub?
Yes. Share the tub drawing, capacity, wall thickness, flow length, material grade, cavity count, decoration method and output target, and Pratishna Engineers will suggest a machine.Does the Machine Suit Other Industrial Packaging Parts Too?
Yes. The same machines can also mould pail and tub lids, jerry-can caps and screw caps for lube bottles, subject to cavity count and 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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