| Autor: |
Christian Hopmann, Christian Windeck, Florian Petzinka |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings. |
| ISSN: |
0094-243X |
| DOI: |
10.1063/1.4965486 |
| Popis: |
The variothermal extrusion embossing process enables a high quality replication of microstructures in plastics films. In this advancement on regular flat film extrusion a polymer melt is shaped by a flat film die and cast on an embossing roll. The surface of the embossing roll has the negative form of the desired microstructure. A counter pressure roll is used to apply the line force needed for embossing, thereby transferring the microstructure into the polymer melt. The melt stays in contact to the embossing roll allowing for a rapid cooling of the film and a solidification of the microstructures inside the molds on the embossing roll’s surface. At the haul-off point the cooled down film is removed from the roll. The governing process parameters for successful embossing are the melt temperature, the viscosity, the surface temperature of the embossing roll and its rotation speed. By tempering the embossing roll to a low base temperature while using an electrical inductor or a high-power infra-red laser as... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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