Rides, M; Allen, C R G; Dawson, A; Duncan, B (2005) Measurement of the rheological properties of adhesives. NPL Report. DEPC-MPR 019

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Abstract

The development of measurement methods for characterising the rheological behaviour of adhesives in conditions typical of processing is reported, focusing on the melt flow rate and capillary extrusion rheometry methods. Results are presented for a range of hot melt adhesives used for packaging and garments. The melt flow rate instrument has been modified and successfully used to measure melt volume flow rate values in excess of 1000 cm3/10 minutes. Leakage of hot melt adhesive in capillary rheometry testing was identified as a problem and methods to virtually eliminate it have been developed and implemented. However, leakage in the melt flow rate method is likely to remain a problem under certain circumstances due to the nature of the test.
Both the capillary extrusion and melt flow rate methods are capable of ranking the flow behaviour of the adhesives. Quantitative comparison of shear viscosity and entrance pressure drop results obtained from both methods indicated varying levels of agreement, it being good for shear viscosity of the higher viscosity garment adhesives. Explanations accounting for the discrepancies have been proposed.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	DEPC-MPR 019
Subjects:	Advanced Materials Advanced Materials > Adhesives
Last Modified:	02 Feb 2018 13:16
URI:	http://eprintspublications.npl.co.uk/id/eprint/3171

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