About Rotomolding
In the rotomolding process, an aluminum metal mold is filled with a predetermined quantity of polymer powder, closed, clamped and then passed into an oven chamber. The mold is heated externally to a high temperature and rotated around both vertical and horizontal axes. As the powder inside heats up, it begins to melt and adhere to the inner surface of the mold.
This continues until a layer of molten plastic is formed over the inner surface of the mold.
In the cooling chamber air is directed at the mold and in some cases water jets are used. When the plastic inside the mold has become solid, the mold can be removed from the chamber.
The Amazon Case or Rack is then removed from the mold and allowed to cool in a cooling jig to prevent distortion. Cycle time can vary from 20 minutes to one hour.
There is a natural thickening of material at edges and corners which increases strength as the plastic is formed without pressure and as a result has no molded in stresses.
FEATURES
- Rotomolding is cost efficient for small to medium production volumes, i.e. up to 10,000 units
- Rotomolded containers are naturally shock resistant due to the elasticity of the material and a process which builds material at the corners and edges.
- The high density polyethylene (HDPE) used for rotomolding is resistant to a wide range of solvents, acids and alkalis.
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Carousel Rotational Molding Machine
Rotomolding Stage 1 Mold filled with polymer powder
Rotomolding Stage 2. Heating and rotation.
Rotomolding Stage 3. Cooling cycle.
Rotomolding Stage 4. Removal from mold and cooled in a “jig”
The product of choice where flexibility of design and resistance to impact and hostile environments are essential
