The Use Of Dual Capillary Rheometer Techniques As An Aid To Determining Optimum Processing Conditions In Multilayer Extrusion Polymer Processing Research Centre. The Queen's University of Belfast

Format:

Conference/Event

Author/Creator:

McNally, G. M., author.

Conference Name:

International Congress & Exposition (1999-03-01 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

Multilayer co-extrusion of plastics is fast becoming a very cost effective method of improving the barrier properties of plastic products. In this process individual polymers are melted and conveyed by separate extrusion systems, into a common distribution block and through a forming die where the polymer melts merge to form an integral multilayer structure. However, these multilayer structures are proving difficult to extrude because of their widely different temperature profiles required during extrusion, and the fact that all the melts enter a common die which can only be maintained at one particular temperature.The melt rheological characteristics of a range of commercially available barrier materials, polyvinylidene fluoride (PVDF), a terpolymer of vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene (THV), plasticised Nylons and tie layer materials have been studied using Dual Capillary Rheometric techniques. The relative change in shear viscosity with temperature, up to 270°C and shear rates up to 10-5 sec-1 have been investigated, for these materials, in order to determine optimum extrusion parameters during manufacture. The findings are confirmed by pilot plant tube extrusion trials using various multilayer structures and Arrhenius activation energies are also reported for the various polymers over a range of shear rates

Notes:

Vendor supplied data

Publisher Number:

1999-01-0375

Access Restriction:

Restricted for use by site license