The Process

The process of rotational moulding includes four steps:

  • Loading the resin into the mould
  • Heating and fusing the resin
  • Cooling the mould
  • Unloading the mould

STEP 1 - LOADING THE RESIN IN THE MOULD

A closable mould is charged with plastic resin material in liquid ot powder form. A variety of resin materials are available. The most widely used are polyethylenes and plasitisols. Other resin materials include nylon, fluoropolymers, polypropylene, polycarbonate, cellulose acetate butyrate, elastomers, ionomer, polyurethane, EVA and specially formulated compounds. The charged mould is moved into anoven.

STEP 2 - HEATING AND FUSING THE RESIN

The mould is continuously rotated on two axes at low speed. As heat penetrates the rotating mould, the resin adheres to the mould's inner surface until it is completely fused.

STEP 3 - COOLING THE MOULD

The mould is then moved to the cooling chamber and cooled by air or water spray or a combination of both while still rotating. The temperature is lowered in a gradual manner to allow the newly moulded part to solidify, retaining the shape of the mould...

STEP 4 - UNLOADING THE MOULD

The mould is opened, the finished part is removed, and the mould is recharged for the next cycle.