Coex fles BARRIER
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Coextrusion system for the production et 5,7 and 9 layers blown film FLEXIBLE - MODULAR - EFFICIENT

The history of the production of barrier films, is mainly associated to three-layer co-extrusion lines, with a barrier of nylon, bound to the structural polymer by means of the interposition of a tying layer. While being suitable for required purposes, these early structures showed a strong tendency to curl (curling effect), made even worse by the substantial thickness of the layer required to ensure that the barrier was sufficient. This intrinsic defect was the main driving force to quickly move towards the production of geometrically balanced structures, bringing the nylon in the core...

The main feature of this technology is that the residence time of the melt inside the head was highly reduced. The density of the assembly, the moderate volume with the additional advantage that this design allows for the same flow-path on all the layers, offer an excellent flexibility for the choice of polymers which can be used and also leading to an improvement of the time requested for product changeover, with a significant reduction in the purging process. The word “barrier film” immediately brings to mind the food packaging sector, whilst there are many non-food applications, like the...

Rev.001-02/09 www.bonobodesign.it Macchi S.p.A. - 21040 Venegono Inferiore (VA) Italy - via Papa Paolo VI, 5 - Tel. +39 0331 827.717 - Fax. +39 0331 827.750 Service Hotline +39 0331 866.427 - email: macchi@macchi.it - www.macchi.it The content of this catalogue is for informative purposes only. All data concerning technical specifications and production rates granted depend exclusively on contractual agreements. 9 layers 5 layers 7 layers Extruders configuration