A higher alcohol based emulsion type defoamer is widely appleid for paper making process because of tis small affect on sizing performance, excllent effect on deairation of white water, and its low cost. However, there are some weakness in the present emulsion type product, for example the viscosity of product increase during storage, the occurence of spot is sometimes found in relation to the adhesive component from the defoamer when it stains the apepr making system. This paper gives an outiline on the preparation procedure of emulsion type product, and some examples of trouble and shooting. Finally, the auther would like to introuduce our new product "KURILESS 230" which was developed to be aimed at eliminating the above weakness.
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