Regarding the production process, in injection molding, the plastic material is melted and injected into a high-pressure mold. The plastic rapidly solidifies inside the mold and is then extracted as the finished product.

In rotational molding machines, the plastic (either in particles or dust form) is poured into an empty mold, which is then rotated on multiple axes to evenly distribute the plastic material on the inner surface of the mold. The plastic is melted and solidified during the rotation process, and the final shape of the product is then extracted.

Injection molding is typically used to produce small or medium-sized objects, such as electronic components, containers, automotive parts and much more.

Rotational molding is more suitable for large-sized and complex-shaped objects, such as tanks, children’s toys, garden furniture, and heavy vehicle components.

In injection molding, molds are generally expensive to design and manufacture because they require high precision and strength to withstand the high injection pressures.

Molds used in rotational molding machines are generally less expensive, as they can be made from less robust materials since they do not need to withstand high pressures.

Rotational molding is therefore ideal for the production of objects with complex shapes, thanks to its ability to evenly distribute the plastic material on the entire inner surface of the rotating mold. 

Rotational molding is also particularly advantageous for the production of large-sized objects. Rotational molding machines can handle significant mold sizes, enabling the production of tanks, industrial containers, and parts for the naval industry. This capability to work with larger sizes provides an advantage over injection molding, which is more suitable for small-sized objects.