METHOD FOR FORMING FOAMED MATERIAL IN FOAM SHIELD DRIVING METHOD AND FOAMED MATERIAL FOR USE IN FOAM SHIELD DRIVING METHOD

摘要

A method for forming a foamed material in a foam shield driving method, which comprises adding, as a thickener, a material selected from among CMC, a guar gum and alginic acid or a mixture thereof to a frother as a main agent, to thereby prepare a frother solution having been adjusted to have a viscosity of 300 to 500 mPa.s, passing the frother solution through an expanding apparatus (18), to expand it at a prescribed expansion ratio, and, immediately after the expanding, adding an aqueous solution of a metal ion to the resultant foamed product, followed by mixing.