Extrusion
Plastic films are made in the extrusion process. Plastic pellets are crushed and melted continuously under the application of heat. The liquid hotmelt is extruded from a nozzle. The plastic solidifies through cooling and thereby receives its film form. We differentiate between two processes: the blown film and cast film process. The choice of the manufacturing process is determined by the respective requirements for an application. Different visual and mechanical properties for the films are achieved through the different cooling speeds in the two processes. The properties are reinforced through possibilities available in the choice of raw materials. NORDENIA has been manufacturing with both methods since the mid-70s.
Blown Film Extrusion
In the blown film process, a ring die forms the extruded hotmelt into a sleeve. Blowing air inside expands the sleeve. The plastic is cooled down slowly by the air that flows past the sleeve and solidifies it into a film sleeve. Blown film extrusion is one of NORDENIA's core competences. A variety of machine configurations based on the latest technology and the high performance of the facilities enable the production of a particularly wide range of blown films.
Cast Film Extrusion
During the cast film extrusion process, a flat sheet die forms the extruded hotmelt into a flat film web that is quickly solidifies on a cooled roll (chill roll). Cast films are primarily used in technically complicated application profiles. In the past few years, NORDENIA has considerably expanded its capacities, especially for the production of "high-performance films", and has gained a strong market position for its products by using the latest extrusion faculties.
