Injection Moulding Machine for Plastic Tubs and Washing Basins
Plastic tubs and washing basins are made on horizontal injection moulding machines from PP copolymer, HDPE or recycled PP blends. Because the part is wide and fairly shallow, clamping force is set by the footprint rather than the part weight. Rim design and even base cooling decide whether a full tub survives a drop and sits flat.
Tub moulds are wide, so selection looks at tie-bar spacing, platen size and clamping force before shot weight. Pratishna Engineers supplies horizontal injection moulding machines for tub and basin moulding and can recommend a configuration for your size range.
Manufacturing Plastic Tubs?
Share the tub diameter, depth, material and mould size, and Pratishna Engineers will recommend a suitable machine.
Machine Requirements for Plastic Tub Moulding
An open tub is a large flat projection with a short wall, and that changes what the machine has to provide:
- Clamping force matched to the full tub footprint
- Tie-bar spacing wide enough for a broad mould
- Ribbed or rolled rim filled solid without short shots
- Even base cooling so the tub sits flat
- Nesting draft kept consistent for stacked dispatch
- Stable fill with recycled PP of varying melt flow
Recommended Machine for Plastic Tubs
Small basins and shallow tubs can run on the E Series (75-180 T). Mid-size washing tubs usually move to the C Series (140-320 T), and the H Series (120-350 T) handles wider moulds and heavier rims. Large bathing and laundry tubs may need more clamping force, and those are discussed on request.
Not Sure Which Machine You Need?
Send your tub dimensions and mould size for a suitable machine.
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 KBHousehold Products Components & Machine Guide
A guide to Household Products components, covering buckets, mugs, tubs, storage boxes, casseroles, hangers, bins, baskets and kitchen containers. It explains PP and HDPE, food-contact use, recycled material, mould height, and how to match each part to a suitable machine.
Download PDFPDF · 204 KB
FAQs / Buyer Questions
What tub and basin makers ask most when sizing a machine.
Which Injection Moulding Machine Is Used to Make Plastic Tubs?
A horizontal machine whose clamping force and tie-bar space suit the tub footprint. Pratishna Engineers matches basins to the E Series and larger tubs to the C or H Series, with bigger tools reviewed on request.Why Is Tub Tonnage Higher Than the Part Weight Suggests?
Clamping force depends on the projected area under injection pressure. A wide tub has a large area even though the wall is thin, so the press is sized by diameter, not by the weight of plastic.How Do You Stop a Tub Base from Warping?
Warpage on a wide base usually comes from uneven cooling or wall thickness. Balanced cooling channels, ribs under the base and gating that fills the part evenly help it sit flat after ejection.
How Is Rim Strength Built Into a Tub?
A rolled or ribbed rim gives stiffness without thickening the whole wall. The rim must fill completely, so venting and injection speed are set to avoid short shots at the far edge.Can Pratishna Recommend a Machine for My Plastic Tub?
Yes. Share the tub drawing or sample, diameter and depth, material, part weight, mould dimensions and output target, and Pratishna Engineers will recommend a suitable machine.Does the Machine Suit Other Bathroom and Laundry Products Too?
Yes. The same machines can mould plastic buckets, plastic trays, dustpans and soap dish and bathroom accessory parts, depending on the size of each 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.
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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