Rotational moulding (or Rotomolding) is a process that is used to manufacture plastic products. It involves the heating and melting of a thermoplastic powder in a mould, the liquid polymer then coats the mould surface to produce the desired shape. This process is typically used to mould hollow parts, especially those with complex and varied shapes not easily obtainable by other hollow-art processes. It is a virtually shear-free and pressure-free process. The wall thickness uniformity and part weight can be easily maintained and there is very little waste of material due to scrap. The moulds used are normally less expensive than the moulds used in injection and blow moulding.

Rotational Moulding Process

Steps:

1. Loading - This is where the polymer powder is loaded into the mould.

2. Heating - The powder is heated in a mould that is rotating on two axes. The melted powder coated the inside of the mould to provide the required shape.

3. Cooling - The part is cooled in a cooling station under the desired temperature is achieved.

4. Unloading - The finished part is removed from the mould.

Materials

Low Density Polyethylene

Medium Density Polyethylene

High Density Polyethylene

Polypropylene

Customised Material

Advantages

Very large parts can be manufactured

Minimum design constraints

Very low tooling costs

No polymer weld lines

Stress-free products.

Rotationally Moulded Products

Pipe Fittings
Oil Tanks
Water Tanks
Chemical Containers
Intermediate Bulk Containers
Materials Handling Products
Bottle Banks
Instrument Housings
Agricultural Feeders
Agricultural Drinkers
Highway Barriers
Boats and Kayaks
Tool Carts
Planter Pots
Playground equipment
















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