Datum
2019Schlagwort
660 Chemische Verfahrenstechnik, Technische Chemie ExtrudierenSiliconkautschukGeometrieStoffeigenschaftMetadata
Zur Langanzeige
Konferenzveröffentlichung
The Influence of different die geometries on the Extrusion Process of High-Consistency Silicone Rubber
Zusammenfassung
Silicone Rubber and especially High-Consistency Silicone Rubber (=HCR), are typically processed in the extrusion process. Due to the high requirements in terms of the ma-terial properties and the geometric dimensions, a funda-mental knowledge of the whole process including experi-ences in tool design are essential.
In this study, HCR with different Shore-hardnesses are extruded on a vertical silicone extrusion line with various breaker plates with different length to diameter ratios (=L/D-ratio) in order to analyze the influence on the whole extrusion process.
It has been shown that soft materials, regardless of die geometry, achieve higher throughputs compared to harder compounds. Increasing counter pressure, e.g. due to long-er die lengths, reduces the volume flow rate per revolution and reduces the throughput. Tools with a small L/D ratio achieve the highest throughput. With regard to die design, it can be seen that dies with a smaller L/D ratio have clear advantages: due to their short length, they represent a smaller pressure consumer. As a result, the dwell time in the extruder is shorter and the risk of scorch is reduced. The absolute value of the swelling behavior is larger, but can be predicted with high accuracy. Shorter tools also show less flow instabilities.
In this study, HCR with different Shore-hardnesses are extruded on a vertical silicone extrusion line with various breaker plates with different length to diameter ratios (=L/D-ratio) in order to analyze the influence on the whole extrusion process.
It has been shown that soft materials, regardless of die geometry, achieve higher throughputs compared to harder compounds. Increasing counter pressure, e.g. due to long-er die lengths, reduces the volume flow rate per revolution and reduces the throughput. Tools with a small L/D ratio achieve the highest throughput. With regard to die design, it can be seen that dies with a smaller L/D ratio have clear advantages: due to their short length, they represent a smaller pressure consumer. As a result, the dwell time in the extruder is shorter and the risk of scorch is reduced. The absolute value of the swelling behavior is larger, but can be predicted with high accuracy. Shorter tools also show less flow instabilities.
Zitierform
In: Society of Plastics Engineers (Hrsg.): ANTEC® 2019 - Proceedings of the Technical Conference & Exhibition, Detroit, MI, March 18-21, 2019. Society of Plastics Engineers: 2019, S. ; isbn:978-0-9753707-2-8, eisbn:978-1-59124-974-0Zitieren
@inproceedings{doi:10.17170/kobra-202206216373,
author={Verheyen, Fabian and Giesen, Ralf-Urs and Heim, Hans-Peter},
title={The Influence of different die geometries on the Extrusion Process of High-Consistency Silicone Rubber},
booktitle={ANTEC® 2019 - Proceedings of the Technical Conference & Exhibition, Detroit, MI, March 18-21, 2019},
year={2019}
}
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2022-06-22T09:36:39Z 2022-06-22T09:36:39Z 2019 doi:10.17170/kobra-202206216373 http://hdl.handle.net/123456789/13941 eng Society of Plastics Engineers Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ 660 The Influence of different die geometries on the Extrusion Process of High-Consistency Silicone Rubber Konferenzveröffentlichung Silicone Rubber and especially High-Consistency Silicone Rubber (=HCR), are typically processed in the extrusion process. Due to the high requirements in terms of the ma-terial properties and the geometric dimensions, a funda-mental knowledge of the whole process including experi-ences in tool design are essential. In this study, HCR with different Shore-hardnesses are extruded on a vertical silicone extrusion line with various breaker plates with different length to diameter ratios (=L/D-ratio) in order to analyze the influence on the whole extrusion process. It has been shown that soft materials, regardless of die geometry, achieve higher throughputs compared to harder compounds. Increasing counter pressure, e.g. due to long-er die lengths, reduces the volume flow rate per revolution and reduces the throughput. Tools with a small L/D ratio achieve the highest throughput. With regard to die design, it can be seen that dies with a smaller L/D ratio have clear advantages: due to their short length, they represent a smaller pressure consumer. As a result, the dwell time in the extruder is shorter and the risk of scorch is reduced. The absolute value of the swelling behavior is larger, but can be predicted with high accuracy. Shorter tools also show less flow instabilities. open access Verheyen, Fabian Giesen, Ralf-Urs Heim, Hans-Peter Extrudieren Siliconkautschuk Geometrie Stoffeigenschaft publishedVersion 2019-03-18 Detroit ANTEC® 2019 - Proceedings of the Technical Conference & Exhibition, Detroit, MI, March 18-21, 2019 Society of Plastics Engineers isbn:978-0-9753707-2-8 eisbn:978-1-59124-974-0 false ANTEC 2019
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