Patent ID: 7943672

Claim:
A method for mixing a high-viscosity material with a gas, using a piston pump in which a piston is reciprocally moved in a cylinder to thereby effect suction and discharge, said method comprising: a step of effecting a first suction stroke in which the piston is moved in the cylinder so as to generate a suction condition in the cylinder; a step of supplying a high-viscosity material to the cylinder at a high-viscosity material supply pressure using a suction force in the cylinder generated in said first suction stroke, wherein the high-viscosity material supply is at a pressure of 1 to 10 kg/cm 2 ; a step of stopping the piston after said first suction stroke; a step of effecting a second suction stroke in which the piston is moved in the cylinder after the supply of the high-viscosity material; a step of supplying a gas to the cylinder at a gas supply pressure of 0 to 5 kg/cm 2 , using a suction force in the cylinder generated in the second suction stroke; a step of effecting a pressurizing stroke in which the piston is moved in the cylinder after completion of the supply of the gas, to thereby pressurize the high-viscosity material and the gas; and a step of effecting a discharge stroke in which the piston is moved in the cylinder after the pressurizing stroke, to thereby discharge the high-viscosity material and the gas into a conduit.