Abstract:
Described is a system for controlling the amount of coating per unit of area applied to a continuous web which passes through a dip tank and thence through squeeze rolls and one or more drying chambers. The system also incorporates means for controlling tension in a dried web, which tension is a function of the amount of coating applied per unit of area. The foregoing is accomplished by controlling the amount of concentrated coating solution fed to a blending tank, which supplies the dip tank, as a function of web speed; by controlling the pressure exerted on the web by the squeeze rolls as a function of the liquid level in the blending tank to which excess solution from the squeeze rolls and dewatering pads is fed; and by controlling the amount of solvent for the concentrated coating solution fed to the blending tank as a function of the tension in the dried web. The invention additionally includes means for directly monitoring the density of the coating solution in the blending tank and for adjusting that density should it depart from a predetermined set value.
Abstract:
Described is a control system for a refining hydrogenation and deodorizing plant for edible oils and the like wherein various system variables are converted into signals which are fed to a computer which controls the system to optimize performance and reduce oil losses.