Patent ID: 8449935

Claim:
A method for producing soymilk, comprising: a submerged friction-grinding step of grinding down soybeans while keeping the soybeans immersed under soybean-grinding water in an air-tight friction-grinding portion of a submerged friction-grinding unit to obtain a raw soybean soup having a specific gravity of 1.00-1.10; a retaining step retaining the raw soybean soup at 15° C. or lower, or for 5 minutes or less thereby obtaining a retained soybean soup; a preheating step of preheating the retained soybean soup at a temperature of 60-80° C. within 0.1-60 seconds thereby obtaining a soybean soup; and a heating step of further heating the soybean soup at a temperature same as or higher than the temperature in the preheating step in a continuous heating unit or a batchwise boiling can; wherein the preheating step and the heating step are air-tightly connected therebetween.