Coex fles BARRIER
Coex fles BARRIER
The document discusses the evolution and advancements in coextrusion systems for producing 5, 7, and 9-layer blown films. Initially, three-layer co-extrusion lines were standard, but they had limitations such as curling effects due to the thickness of the barrier layer.
Technological Advancements
The introduction of EVOH and improved tie resins led to the development of asymmetric structures with different sealing layers. This necessitated systems with four extruders and a five-layer head, which became a standard setup.
Current Production Systems
Macchi has developed systems to produce films with multiple barriers (PA and EVOH) to optimize performance and reduce thickness. This includes the development of five, seven, and nine-layer machines, along with innovative extrusion screws and head designs.
Key Features
The technology reduces the residence time of the melt inside the head, offering flexibility in polymer choice and improving product changeover times. This is crucial for applications in food packaging, pharmaceuticals, automotive, and industrial specialties.
Additional Technologies
Macchi provides technology-oriented devices for perfectly winding these expensive films, ensuring high-quality production.
Conclusion
The document highlights Macchi's commitment to innovation in barrier film production, addressing industry needs for efficiency and flexibility.
Catalog excerpts
Coextrusion system for the production et 5,7 and 9 layers blown film FLEXIBLE - MODULAR - EFFICIENT
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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 central...
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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 pharmaceutical-...
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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: [email protected] - 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
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