Method of producing honeycomb structural bodies consisting of barium titanate series ceramics having a positive temperature coefficient of electric resistance

A method of producing a honeycomb structural body consisting of barium titanate series ceramics having a positive temperature coefficient of electric resistance, comprising kneading raw material powders, which contain at least 50% by weight of powders having perovskite type crystal structure and have a particle size distribution that 5-50% by weight of the raw material powders has a particle size of not smaller than 10 .mu.m and 10-60% by weight thereof has a particle size of not larger than 2 .mu.m, together with water and at least two kinds of organic binders to prepare a green mass, extruding the green mass into a honeycomb shaped article, drying the extruded article by blowing air through the channels of the honeycomb article at a rate of at least 50 cm/sec until the water content of the article becomes less than 5% by weight wherein the temperature of the air employed is less than 40.degree. C., and firing the dried article, wherein said at least two kinds of organic binder are different by at least 50.degree. C. in the decomposition temperature or weight decreasing temperature between a binder having the highest decomposition temperature or weight decreasing temperature and another binder having the lowest decomposition temperature of weight decreasing temperature.