VISCOSITY CONTROL - High Brightness Paper Coatings

SUMMARY

Viscosity control during manufacture ensures high brightness and smooth finish. Proper viscosity defines balance between high filler load and leveling properties. One manufacturer reports $40,000 to $50,000 savings per month due to reduced scrap.

INSTALLATION

The VISCOLINER mounts directly onto an ANSI flange. The transmitter can be located conveniently on a wall in the mill or located in a control room up to 1000' from the transducer. The transducer may be installed near the bottom of the kettle, keeping the sensor clean due to liquid contact and mixing action, or pipeline mounted in a tee section.

OPERATION

Tank installations are trouble free when precautions are taken to prevent film formation between batches. Fill up the tank with water before shutdown. Changes in sources of clay or carbonate usually means corresponding changes in dispersion time, which is continuously indicated by the viscometer. Check instrument calibration once a year.

TEST

Addition of clay to the low viscosity starch and blending with TiO2, lubricant and dye are accurately controlled by the VISCOLINER®. Dispersion time is determined by mixing to a constant viscosity. Final adjustment within upper and lower control limits ensures good flow and leveling of the wet film on the sheet; maximum brightness is the result.

The VISCOLINER® is especially good for controlling multiphase fluid systems like paper coatings. It measures at a high shear rate and it correlates with low shear laboratory viscosity measurements.

TYPICAL OPERATING CONDITIONS

Temperature: 50°F to 120°F

Pressure: ATM to 150 psig

Viscosity: 50 to 600 cP

VISCOLINER® SPECIFICATION

Temperature: -40°F to 850°F

Pressure: ATM to 5000 psig

Viscosity: 0.1 to 1,000,000 cPs

Materials of Construction: 316SS

Click here to view the Nametre viscosity monitoring products