VISCOSITY WINDOWS OF OLD MANUAL

The best resource for mill coating information is the Technical Services department in most mills.ДЇor more information on improving your coating process, contact your Valmet representative. Table of rheology and associated problems AreaД¬oating recipes vary by mill, so we donвЂ™t have specific information on them. However, I find it counter intuitive that the dynamic viscosity, the internal friction, of the fluid increases. Coating rheogramsДЇigures 1 & 2 are illustrations showing how different types of coating recipes are affected by shear rate and the problems that can arise when viscosities get out of control.ДЇigure 2 General guidelines for interpreting graphs (see area descriptions below) From dimensional analysis I find that the dynamic viscosity of an ideal gas must depend on its pressure p, density and mean molecular free path l in this way: C p l. High high-shear viscosities can cause poor coat weight control, bleeding at the blade tip, and excessive blade loading, which can lead to poor runnability on the coater. So the chief engineer goes out and inspects the batch through the windows.

VISCOSITY WINDOWS OF OLD MANUAL

It is a good indication of how the coating will respond to high shear rates under the blade tip. People seem to like old war stories, as long as, being fascinating in their. CANNON В® miniQV-X Automatic Viscometer with VISCPRO Instruction & Operation Manual Version 1. High-shear viscosity is not usually done on the coater, but performed in the lab when testing different coating recipes or investigating coater runnability problems. Brookfield viscosity is a good indication of coating solids, problems with the starch cooker operation, blade load pressure, coat weight control, and drying demand.

It is a simple test but very useful for determining operation of the coater.

Low-shear viscosity is the most often performed test in the control of the coating process. Specifically, in coating rheology, it is the measure of the resistance of a coating formulation to an imposed flow. Viscosity is the resistance of a material to flow.

Coating rheology is measured with low shear (Brookfield) and high shear (Hercules) viscosity instruments.

Viscosity windows of old