Vorhersage der mechanischen Folieneigenschaften bei der Schlauchfolienextrusion

The manufacturing of blown films made of thermoplastic materials is considered an important processing technique for polymer raw material. Today, one goal of the further development of the blown film extrusion is the reduction of raw material application while maintaining or improving the quality of the film, also in regard of the mechanical properties. Therefore, the mechanical film properties, as a key aspect on the way to create thinner films, move into the focus of interest. Up to now, a generic and recognised calculation model, which predicts the film properties in the blown film extrusion process, is not available. Hence, large imponderability in predicting film properties for new product development or the change of material or the production line result to the film manufacturer. Therefore, the proposal of a calculation model in order to predict the mechanical characteristic values of the blown film extrusion is the subject of this work. The model developed in the course of this work, in order to predict the blown film properties, is based on the foundation of statistical modelling. The corresponding mechanical characteristic values form the start values of the model. As input value, dimensionless process characteristic values are being chosen, in order to ensure the transferability of the statistical property model on different materials and production lines. Therefore, next to the known characteristic values of the blown film process, blow-up ratio and take-up ratio, additional process characteristic values are being introduced. All used process characteristic values have in common that they describe the process state in the bubble expansion zone because the blown film properties are being fixed there. The results show that it is on principle possible to describe the mechanical blown film properties with statistical models by the use of process characteristic values. The results of shrinkage and strain at 100 % stretch are to be judged as good, while the results of the calculation of Young’s modulus and tensile strength can be used to assess the properties roughly. The transferability of the model to different materials and blown film lines has been realised only to a limited extend. For a possible improvement, further research is necessary. Some approaches by the use of additional material- or plant-specific characteristic values have been shown already.

Grantor dc:publisher

Mainz

Year dc:date

2004

Author dc:creator

• Ohlendorf, Friedrich

Contributors dc:contributor

• Michaeli, Walter

• info:eu-repo/classification/ddc/660
• Schlauchfolie
• Extrusionsblasformen
• Mechanische Eigenschaft
• Kennzahl
• Mathematisches Modell
• Technische Chemie

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-123814%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:62234