Rotational moulding is a very competitive and
efficient alternative to blow moulding, thermoforming and injection
moulding used to manufacture hollow plastic parts. The process involves
a chance to produce stress-free articles, with uniform wall thickness
and complex shapes.
Rotational moulds define the outside shape and surface of the part
without any internal cores. Care should be taken regarding the material
to be used, while designing a mold. This is so, because every mold must
be heated and then cooled during each cycle.
Types of Materials Used:
Cast aluminium Moulds: The most common type of molds, these are used
for small to medium rotational moulding parts. Aluminium moulds cast are
ideal for forming free shapes, unusual shapes and special surface
details that are difficult to machine. Cast aluminium moulds also
provides cost benefits as compared to other moulds, when multiple moulds
are required.
Sheet metal moulds. These moulds are fabricated from metal sheets
including aluminium, steel, or stainless steel. These moulds are widely
used for large and easy shaped products. Due to the manufacturing
process, free form shapes are difficult to achieve in sheet metal moulds
CNC milled moulds. These moulds are made from block aluminium and are
mainly used for smaller products demanding high accuracy and short lead
times. The cost of this type of mould is in direct proportion to the
size of the aluminium block, i.e. the deeper the mould-halves, the
higher the cost.
Application of Rotational Moulds
- Automotive Components
- Waste Bins
- Mannequins
- Toys
- Plastic Furniture
- Tanks
- Types of
Rotomolding Machines -
