Dynamics of film extrusion. Part 2. Studies on scale-up of tubular film extrusion. I. Relation between process condition and film physical properties
| Autor: | Masakatsu Kimura, Jiro Shimizu, Toshitaka Kanai |
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| Rok vydání: | 1985 |
| Předmět: | |
| Zdroj: | Sen'i Gakkaishi. 41:T139-T150 |
| ISSN: | 1884-2259 0037-9875 |
| Popis: | We investigated the relationship between process conditions and physical properties of the wide-thick HDPE films. The wider and/or the thicker HDPE film yielded under the same out-put rate, the lower the physical properties. Elevation of process temperature and temperature rise of resin due to the heat generated by viscous energy dissipation resulted to the insufficient stretching effect and the inferior physical properties.In order to understand the relation between physical properties and process conditions, we observed melt behavior during the tubular film process. It was found that the deformation rate and elongational viscosity were very important factors for the stretching effect. The magnitude of stretching stress at the region from the uppermost of the bubble neck to the frost line level was closely related to the physical properties. The above results imply that the high strength HDPE films can be processed by keeping the stretching stress high; high out-out rate, high take-up speed, and low temperature by reducing the heat generated by viscous dissipation. We realized that measurement of deformation rate during the tubular film process is very important to control the film properties. |
| Databáze: | OpenAIRE |
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