Introduction

Some industries require strict control of particle size and particle shape in order to manufacture high quality products. These industries can benefit from the use of a particle size analyzer that can also perform shape analysis.

This document describes measurement made on plate particles used in paint industry. The shape of the particles is of first importance for the paint industries in order to have good shades. Two samples having the same thickness with two different surface must be controlled after production.

Purpose of analysis

img41The aim is to determine the Shape Factor (SF) of two different samples having the same thickness (3μm). The results obtained by the innovative CCD shape analysis will be compared with laser diffraction analysis.

Experimental set up

The CILAS 1180 Particle Size Analyser is ideal for repetitive, high quality measurements of particle size and shape. Its integrated wet and dry dispersion modes, built in video camera and short optical path make it the most versatile instrument available anywhere. The unique design of the 1180 provides a measurement range of 0.04 to 2,500 μm while maintaining an extremely small footprint.

Expert Shape software allows the users to calculate many different parameters from a sample, and to view qualitative results. Expert Shape for thresholding, contour identification and binary noise removal. Images of your particles can be stored along with the particle size distribution data for later retrieval.

Results summary (d50 in μm)

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Results interpretation

The aim of the measurement was to determine the mean diameter of the particles. The table shows the perfect correlation between the laser diffraction technology and the CCD values.

The benefits of the CILAS 1180 and the EXPERT SHAPE software

– Shape analysis combined with the Laser particle size analyzer
– Direct comparison of results with the same software
– Advanced tools for data management, statistical analysis and report generation
– Methods and results applicable on other CILAS Particle Size Analyzer
– Implementation of a Standard Operation Procedure
– Permanently aligned optical system
– Short bench concept
– Full automated routine analysis
– Interactive, user friendly software

Other applications : Mica, Feldspath, Paint industries, Cosmetic, Metals,…

Conclusion

The both technologies are complementary. The shape analysis helps to characterise the process and the laser diffraction allows to do routine analysis when the process is defined.