Surface tension and extrusion-based rheological characterisation of hot melt adhesives.
- Author(s):
Rides, M, Allen, C R G, Dawson, A, Nottay, J S
- Source:
- Measurement Good Practice Guide No. 81, December 2005
- ISSN:
- 1368-6550
- ISBN:
- NPL Doc. Ref:
- PDB: 4106
- Document Type:
- Guide
- DOI:
Note: An asterisk after an author's name indicates a non-NPL author.
Abstract:
This Guide presents guidance for good practice in measurement of the surface tension and the shear and extensional flow properties of hot melt adhesives. It covers: the measurement of surface tension of hot melt adhesives using the pendant drop method, the measurement of shear viscosity and entrance pressure drop by capillary extrusion rheometry, the measurement of melt flow rate behaviour using a simple extrusion rheometer, and the analysis of the melt flow rate results obtained using ‘long’ and ‘short’ dies to determine shear viscosity and entrance pressure drop data.Example results are presented to illustrate the above methods, and to enable comparison of capillary extrusion rheometry and melt flow rate data thereby demonstrating the applicability of the melt flow rate method.In particular, the rheological methods covered in this guide focus on high rate measurement.
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