Understanding the Rotational Moulding Process
The rotational moulding process, often called rotomoulding, is a versatile manufacturing method ideal for producing large, hollow, and complex plastic parts. It involves a low-pressure, high-temperature cycle that results in seamless, stress-free products with uniform wall thickness. As experts in tooling, we craft precision moulds that are fundamental to the success of this process.
The Four Stages of the Rotational Moulding Process
The rotational moulding process is defined by four distinct stages. It begins with 'Charging', where a pre-measured amount of polymer powder is loaded into the hollow mould. Next is 'Heating' or 'Curing', where the mould is heated in an oven and rotated biaxially, causing the polymer to melt and coat the internal surfaces. This is followed by 'Cooling', where the mould is cooled using air or water, allowing the plastic to solidify into the desired shape. Finally, 'Demoulding' involves opening the mould and removing the finished, one-piece part.
Key Stages of Rotomoulding
- Mould Charging (Loading polymer resin).
- Heating and Rotation (Melting and forming the part).
- Cooling Cycle (Solidifying the plastic).
- Demoulding (Removing the finished product).
- Mould preparation and maintenance between cycles.
Key Features of the Rotational Moulding Process
- Produces seamless, one-piece hollow items.
- Ensures consistent and uniform wall thickness.
- Low-pressure process reduces stress on the final product.
- Ideal for creating complex shapes and large-scale items.
- Minimal material waste as the entire charge is used.
Applications of the Rotomoulding Process
- Manufacturing large water storage and chemical tanks.
- Producing industrial containers, bins, and pallets.
- Creating playground equipment like slides and climbers.
- Automotive components such as ducts and tanks.
- Marine products like buoys, floats, and kayaks.
Benefits of the Rotational Moulding Process
- Exceptional design flexibility for complex, hollow geometries.
- Inherent product strength and durability due to uniform walls.
- Tooling is generally more cost-effective compared to other processes.
- Reduced production stress results in a stronger final product.
- Ability to mould in inserts, threads, and different surface finishes.
Your Partner for Roto Moulding Solutions
As a leading rotational mould manufacturer, Unique Mould leverages a deep understanding of the rotational moulding process. We design and build high-quality moulds, including cast aluminium and fabricated steel, that are optimized for efficient heat transfer, easy demoulding, and a long operational life, ensuring your production is smooth and reliable.
Tips for Optimizing the Rotomoulding Process
- Ensure the mould is properly vented to avoid voids or blowholes.
- Use a high-quality mould release agent for easy part removal.
- Precisely monitor oven temperature and heating times for optimal curing.
- Control the cooling cycle to manage shrinkage and part dimensions.
- Regularly clean and inspect mould parting lines for a clean finish.
FAQs – Rotational Moulding Process
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