Rotational moulding (also known as rotomoulding) is a manufacturing process used to produce hollow plastic products, most commonly using polyethylene.
Unlike other moulding methods, rotational moulding does not rely on high pressure. Instead, plastic powder is heated inside a mould that rotates slowly, allowing the material to coat the inside evenly and form a consistent, durable product.
The process typically involves four key stages:
1. Loading
Polyethylene powder is placed into a mould.
2. Heating and rotation
The mould is heated in an oven while rotating on two axes. This ensures the material coats the internal surface evenly.
3. Cooling
The mould continues rotating as it cools, allowing the product to retain its shape and strength.
4. Demoulding
The finished product is removed from the mould.
Rotational moulding is particularly well suited to:
Uniform wall thickness
Products are consistent and structurally sound.
Durability
Polyethylene is highly resistant to impact, UV exposure and chemicals.
Design flexibility
Complex shapes and large products can be produced.
Cost-effective tooling
Compared to injection moulding, tooling costs are significantly lower.
Rotational moulding is ideal when:
Rotational moulding is a versatile and cost-effective manufacturing process for producing strong, durable plastic products. It is widely used across agriculture, mining and industrial applications where reliability matters.
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