CONTROL OF VACUUM AND EVACUATION RATE IN TOOTHPASTE MANUFACTURING PROCESS AND PRODUCTION OF TOOTHPASTE

摘要

PROBLEM TO BE SOLVED: To provide a vacuum control method suppressing the scattering of an inner soln. to a evacuation piping when a pasty product such as toothpaste is defoamed and efficiently performing pressure reducing operation within a short time. ;SOLUTION: A liquid substance to be defoamed is charged in the vacuum stirring and mixing tank 2 connected to a vacuum pump unit 5 by a evacuation piping 8 and evacuation is performed from an atmospheric pressure state by the vacuum pump unit 5. At this time, the liquid surface position of the liquid substance in the vacuum stirring and mixing tank 2 is measured within a real time by a level sensor 16 and, when it is detected that the liquid surface reaches a predetermined upper limit position, a suction valve 12 is opened to suppress the lowering speed of the pressure in the vacuum stirring and mixing tank 2 or to slightly raise pressure temporarily. By this operation, the liquid surface is lowered from the predetermined upper limit position and, after it is detected that the liquid surface falls to a predetermined lower limit position by the level sensor 16, the suction valve 12 is again closed to continue evacuation and the liquid substance is allowed to reach a predetermined vacuum within a short time to be accelerated in aeration.;COPYRIGHT: (C)2000,JPO