How It Works
Rotational Moulding machines are computer controlled, ensuring consistent quality for every unit produced. The Rotational Moulding process is split into 4 operations:
The process begins by loading a hollow, aluminium mould with a pre-determined amount of powdered polymer, typically polyethylene and virgin or recyclable material. The mould is then closed, locked and loaded into an oven chamber.
Once inside the oven, the mould is rotated biaxially (ie. around 2 axes). The temperature of the oven, typically between 260°C - 370°C depending on the material used, causes the polymer to melt. As the mould rotates, the molten polymer is dispersed evenly and coats the inside walls of the mould.
After the mould has been rotated sufficiently to spread the molten polymer evenly, it is then removed from the oven and cooled, causing the polymer to solidify.
When the mould has cooled sufficiently to retain its shape, the mould is opened and the product removed. The mould can then be reloaded and the process repeated.
Benefits of Rotational Moulding
• Variety of surface finishes and colours
• Flexible designs
• Even wall thickness
• Extremely durable
• Stronger, lighter mouldings
• Minimum wastage
• Economic tooling costs
• Economical and environmentally friendly production