Over the last 100 years one of the most widely used items of equipment used in the dispersion of powders into paint were ball and pebble mills.Due to improvements in the dispersibility of the most common pigments and extenders ball and pebble mills have fallen out of favour,with high-speed dispersers now being the dispersion equipment of choice.Many modern paint factories no longer have a ball and/or pebble mill available.Ball and pebble mills still have a place in the modern paint factory,particularly if the smaller particle size pigments such as carbon black or organic pigments are to be dispersed.The van der Waals force binding the agglomerates of nano particle sized organic pigments cannot be separated by a high-speed disperser.Greater shear,such as that obtained by a ball or pebble mill,is required to break apart these agglomerates.
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