Rotational molding: What is it and how does it work?

Rotational molding: What is it and how does it work?
14 Dicembre 2021 lorelux_redazione

Rotational molding, also called rotomolding, is a production technique that allows the creation of hollow objects with constant thickness without any welding spot.

It permits to obtain products of large dimensions and with very complicated contours, which are difficult to obtain with other automated techniques such as injection molding or thermoforming.


Its operation is divided into 4 phases:

  1. Charging: the hollow mold is filled with the necessary quantity of plastic material, so with no waste
  2. Heating: the mold is heated and at the same time rotated around two axes, so that the molten polymer placed inside adheres to the walls of the mold. The process has a low environmental impact, as the fusion of the powders takes place without direct contact with flames or heat sources
  3. Cooling: the mold is cooled, so that the polymer solidifies in the desired shape
  4. Demolding: the mold is opened to extract the solid product

Lorelux has chosen this technology to create original, durable and 100% recyclable luminaires, with the aim of offering more freedom in urban lighting design even in particularly aggressive environments, such as coastal areas or with a high concentration of pollutants.

To learn more about rotomolding, we suggest the article on the online magazine Rotoworld

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