During the operating process with dissolvers it must be assumed that the electrical energy will unavoidably lead to product heating due to particle friction, a side effect which is advantageous for the optimum dispersion process, because the flow behaviour of the product is positively influenced. Trials in the manufacture of white lacquer from titan dioxide pigments resulted in a considerably improved fineness modulus by approx. 5 µ at a temperature of 70° C, thus a better degree of whiteness and gloss as compared with a dispersion temperature of only 60° C.
Due to the improved particle wetting, in addition to pigment saving, not only the colour intensity development but also the storage stability is positively influenced. Experience has shown that the critical temperature upper limit of the majority of products is clearly higher than the factory reference values for dissolver application.