These are those who operate the transformation process, i.e. they transform raw materials, e.g. in the form of polymer pellets, with steps that may include the formation and orientation of the film, until a final packaging structure is obtained.

Source:

Morris, B. A. ‘Converting Processes. In Morris, B. A. (Edited by) “The Science and Technology of Flexible Packaging. Multilayer Films from Resin and Process to End Use” (2017), William Andrew Publishing, Norwich. (ENG) ISBN 97803242738.