< back to main site

Publications

Improved testing using the melt flow rate instrument - multi-rate and extensional flow measurements.

Rides, M; Allen, C R G; Dawson, A (2001) Improved testing using the melt flow rate instrument - multi-rate and extensional flow measurements. NPL Report. MATC(A)28

[img] Text
MATC28.pdf

Download (582kB)

Abstract

The melt flow rate method is widely used in quality control within the polymer industry and is likely to remain as a dominant tool for quality control and assurance. However, it is widely accepted within the industry that the melt flow rate method has limitations. To address these limitations various developments to the melt flow rate method have been undertaken and are reported here.
These developments encompass: the use of multi-load testing to enable melt floe rate data to be extrapolated more reliably to higher shear rate, the use of alternative die geometrics to separate the shear and extensional flow behaviours and the measurement of extrudate swell and draw-down.
The results presented demonstrate good agreement of shear viscosity and entrance pressure drop data measured using the multi-rate melt flow rate method with data obtained using a capillary extrusional rheometer. Furthermore, good qualitative agreement has been obtained between extensional flow behaviour measured by extrudate draw-down with that measured using quantitative stretching technique thus demonstrating the significant value of the draw-down technique.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MATC(A)28
Subjects: Advanced Materials
Advanced Materials > Polymer Rheology
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2005

Actions (login required)

View Item View Item