Preferential heating

Preferential heating

Preferential heating

By using a standard heating process, the expansion of material is uniform in all directions; for this reason this is unsuitable for the production of non-cylindrical containers; indeed, the use of a standard heating process on a non-cylindrical container would lead to the premature cooling of non-stretched material, causing non-uniform thickness zones on the final container.


Preferential heating uses a differentiated/dedicated temperature profile, allowing the preform to expand in a controlled manner and take the specific shape of the mould. Preferential heating thus enables to:

  • have a better material distribution; in particular it allows to obtain uniform thicknesses on complex containers (i.e. asymmetric, non-cylindrical)
  • eliminate zones with an excessive thickness
  • facilitate the labelling
  • optimize the weight of a particularly complex container

Therefore preferential heating is suitable for the production of containers for detergents, cleaners, cosmetics, pharmaceutical products, sauces, condiments and some alcoholic beverages with the ratio of the long and short side exceeding 2.

ECOBLOC® K ERGON with preferential heating

3D simulation of SMI's blowing/filling/capping system for non-cylindrical containers