Please use this identifier to cite or link to this item: https://hdl.handle.net/1822/15628

TitleBi-axially oriented blown film technology: searching for suitable polymers and processing conditions
Author(s)Carneiro, O. S.
Covas, J. A.
Domingues, C.
KeywordsBi-oriented blown film
Extrusion
Rheological properties
Processing-properties
Bubble stability
Issue date2012
PublisherCarl Hanser Verlag GmbH & Co.
JournalInternational Polymer Processing
Abstract(s)A set of commercial polyethylenes (three LDPE and three LLDPE) was rheological characterized and processed in a laboratory double bubble extrusion line with the purpose of investigating: i) whether their relative processability could be predicted in the laboratory and ii) the effect of operating and machine variables on processability. Oscillatory shear and extensional measurements were able to differentiate the various materials, who also behaved quite differently upon processing. Those with a stronger shear thinning behaviour, higher elasticity and higher melt strength were the most suited to the process. Bubble stability and thickness uniformity were assumed as the main requirements for processability. The former was estimated by monitoring the time required to stabilize the bubble and examining any variation/ oscillation in size/ shape. Bubble stability depends on the interaction between various parameters, the most relevant being those related with the film cooling stage, namely the axial position of the air rings, the air flow rate and air velocity. The study was preceded by an assessment of the performance of the re-heating oven and die/ calibration/ centring, as these parameters could also narrow the practical operating window.
TypeArticle
URIhttps://hdl.handle.net/1822/15628
DOI10.3139/217.2538
ISSN0930-777X
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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