Extrusion or extruding refers to continuous production of a semi-finished article, tube or a film made of plastic. Multi-wall sheet extrusion refers to the production of very light sheets consisting of two, three or more layers that are linked to each other by means of fillets.

Usually multi-wall sheets are made of Makrolon^®, a transparent polycarbonate.

Multi-wall sheets made of Makrolon^® are used, for example, for window construction in greenhouses, industry, building construction and urban development, window panes in the private household sector (conservatories, verandas and carports) as well as in the hobby sector.

Fig. 1 Extrusion unit for multi-wall sheets [Omipa, Morazzone (VA), Italy]

Strengths

General

Multi-wall sheet systems consist of at least an extruder, a multi-wall sheet nozzle as well as a vacuum calibrator, followed by a take-off unit. The vacuum calibrator has the function of fixing and cooling the plastic that has been plasticized by the extruder in a certain form. The characteristic properties of extruded multi-wall sheets made of Makrolon^® include:

Fig. 2 Multi-wall sheets made of Makrolon®