(192n) STATISTICAL MODELING of Coating Colour Formulation with A LOW Cost Blend of Starch-Styrene Butadiene Latex Binder
STATISTICAL MODELING OF COATING COLOUR FORMULATION WITH A LOW COST BLEND OF STARCH-STYRENE BUTADIENE LATEX BINDER
NITIN MOON , N.C.MISHRA, AND A.K.RAY
DEPARTMENT OF PAPER TECHNOLOGY, IIT ROORKEE, INDIA
Styrene butadiene latex as binder and starch as co-binder are presently predominantly being used in Indian paper industry in coating colour formulation along with pigments such as calcium carbonate and clay,. Not only the cost of SB latex is much higher than that of starch , it is not environmentally friendly. However the use of starch and latex proportions in the binder are governed by the desired properties of paper .The effective cost of blends can be optimized in relation to optimizing coated paper properties.
The study planned in this present investigation mainly focuses on the variation of properties of coated paper with varying composition of coating color with clay as a pigment in which only binder and co-binders are changed.The study deals with various composition of starch and SB latex balance to get the targeted properties for all set of experiments. As the SB latex is used in almost all coating industries and more or less the properties remain constant, the starch has varying properties depending upon the source and the modification method used. The objectives of the study is to find out the balance between costly SB latex and cheaper starch samples supplied by an well known Indian industry. The coating experiments were performed in “DT Paper science Finland” laboratory coater.
Styrene Butadiene shows an increase in IGT, gloss, opacity, smoothness, brightness and whiteness with the increase in amount of SB latex in the binder, whereas porosity is found to decrease as the very small sized plastic particles of SB latex increase in the coating formulation. Starch samples show a similar nature of effect on properties of coated sheets. As the amount of starch in the coating color increases, the IGT value and the porosity are found to increase. But the opacity, gloss, smoothness, brightness and whiteness properties decrease with the increase in amount of starch in binder level in coating color formulation.
Based on the data experimentally evaluated in a pilot coater, various statistical regression analyses have been performed. A computer program was developed to optimize various options. A sample calculation has been shown to get the minimum cost of blend of latex and starch