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ABSTRACT
This article firstly describes the historical development of coextrusion and focuses on its impact on the maket of foils and sheets. After mentioning the typical drawbacks generated by the deformations and interfacial instabilities, it describes two generic technologies i.e. the coextrusion box and the multichannel sector, highlighting the details of the design of materials placed on the market. It then mentions the ongoing developments concerning layer multipliers and the continuous measurement by IR gauge of the layers thickness. It finally deals with the multilayer coextrusion, a lesser known aspect of the subject and yet worthy of interest.
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Francis PINSOLLE: ENSEM engineer (École nationale supérieure d'électricité et de mécanique de Nancy), - Master of Sciences from Philadelphia University (U of P), - IAE (Aix-en-Provence Institute of Business Administration)
INTRODUCTION
In less than forty years, coextrusion has become a major technological component of extrusion.
In every field, from tube to sheet, from profile to plate, from bottle to blown film, it is at the heart of manufacturing processes. Among other things, it can be used to incorporate :
a protective layer on the outside of the profile;
a flexible joint on a rigid profile;
a color and/or protective layer on the surface of a sheet or plate;
an inner barrier layer in a sheet, tube or bottle;
scratches on the outside of tubes and straws (used for drinking);
an internal recycling layer, etc.
In particular, coextrusion is ubiquitous in sheet and plate production, to the extent that virtually every line sold today incorporates several extruders.
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