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2. Flat dies
The molten polymer flows through a flat die with a rectangular end section. One of the aims of this tool is to achieve the best possible temperature and thickness uniformity across the die (i.e. perpendicular to the direction of flow). The air gap (i.e. the rectangular cross-section through which the molten polymer flows) of the dies used in cast film can be adjusted either manually or automatically. Uniformity of flow distribution is linked to the design of the channel (commonly called a manifold), and a flexible lip is used for final adjustment of the melt thickness. In some applications, a throttle bar is used to adjust flow regularity.
2.1 A few design rules
The purpose of the die is to transform a polymer flow from a circular to a rectangular geometry....
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Flat dies
Coextrusion systems
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
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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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