Injection Moulding Machine for Washing Machine Tubs
Washing machine outer tubs are moulded on large horizontal injection moulding machines, toggle or two-platen, from talc-filled PP, glass-filled PP or PP copolymer. Projected area, mould height for the tub depth and a heavy shot set the machine size. Cooling layout matters most, because it controls warp and roundness on the thin shell.
Machine selection for a tub starts with clamping force beyond mid-size presses, a long opening stroke for the deep core and enough shot capacity. Pratishna Engineers supplies horizontal and two-platen injection moulding machines and can review your tub and mould details to advise what fits.
Manufacturing Washing Machine Tubs?
Share your tub drawing, material, part weight and mould size, and Pratishna Engineers will review the tonnage needed and advise.
Machine Requirements for Washing Machine Tub Moulding
An outer tub is a large, deep shell that has to stay round and stiff in hot water and detergent. Machine selection depends on:
- Clamping force for the full projected area of the tub
- Long opening stroke and mould height for a deep core
- Large shot weight with stable melt from talc-filled PP
- Mould cooling layout that holds roundness and limits warp
- Even wall thickness and rib layout for balance at spin
- Suspension mounting bosses and drain port moulded with the tub
Recommended Machine for Washing Machine Tubs
Outer tubs need more clamping force than the standard Pratishna series provide. The H Series (120-350 T) and Two-Platen PHM Series (160-350 T) are offered for smaller appliance mouldings, and Special Purpose machines are built to application. Share your tub drawing and mould details on enquiry, and the team will advise whether a suitable machine can be offered.
Not Sure Which Machine You Need?
Send your tub drawing and mould size so the required tonnage can be checked.
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 KBWhite Goods & Appliances Components & Machine Guide
A guide to White Goods & Appliances components, covering washing machine tubs and panels, refrigerator liners and trays, AC louvres and grilles, fan blades, mixer bodies and appliance housings. It explains large-part moulding, cosmetic finish, flame-retardant grades, and how to match each part to a suitable machine.
Download PDFPDF · 204 KB
FAQs / Buyer Questions
Questions buyers ask most before moulding washing machine outer tubs.
Which Injection Moulding Machine Is Used to Make Washing Machine Tubs?
Tubs run on large-tonnage presses sized by tub diameter, depth and shot weight. That class is larger than the H and PHM Series, so each tub is reviewed on enquiry rather than matched to a standard model.Why Is Talc-filled or Glass-filled PP Used for Tubs?
Filled PP gives the stiffness to hold shape under load and resists hot water and detergent. Glass fibre adds more stiffness but wears the screw and barrel faster, so a wear-resistant screw is worth discussing.What Causes Warp in a Washing Machine Tub?
Uneven cooling across the large thin shell is the main cause, along with changes in wall thickness and fibre orientation in glass-filled grades. Cooling channel layout and mould temperature control it more than extra clamp force.
Why Is the Outer Tub Moulded in One Shot?
A single moulding replaces an assembly of several parts, which cuts joining work and leak paths. The trade-off is a large, costly mould and a high-tonnage press, so the part design is settled before tooling starts.Can Pratishna Recommend a Machine for My Washing Machine Tub?
Share your tub drawing or sample, material grade, part weight, mould dimensions and annual volume. Pratishna Engineers will check the clamping force and mould height needed and advise on the options.Does the Machine Suit Other White Goods Parts Too?
The H and PHM Series can run smaller appliance parts such as washing machine pulsators and lint trap frames, fan blades, AC louvres and appliance knobs, subject to the mould and tonnage.
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.
- Machine Sales
- +91 99690 38542
- Service Support
- +91 97689 28259
- Sales Email
- [email protected]