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3. Coextrusion systems
Coextrusion of several polymers is very common in cast film technology. There are two main ways of producing a multilayer cast film:
use a single-layer die downstream of a coextrusion box (known as a feed block or black box);
use a multi-layer die (multimanifold).
The combination of feed block and single-layer die remains the most frequently used system. Here we describe the principles, advantages and disadvantages of each of these systems.
A single-layer die (called a single-manifold) can be used downstream of a coextrusion box (usually called a feed-block), as shown in figure
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Coextrusion systems
Drawing stage
References
Machine manufacturers (non-exhaustive list)
Axon Plastics Machinery AB
Battenfeld Gloucester Europe Ltd
Berstorff GmbH
Black Clawson Converting Machinery LLC
Brückner Maschinenbau GmbH
Collin Dr, GmbH
Davis Standard France
Dolci Extrusion SpA
...
Theses
- - http://www.sudoc.abes.fr
- SOLLOGOUB (C.) - Étude du procédé d'extrusion couchage de films polymères sur tôle d'acier. - École nationale supérieure des mines (2003).
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