TECHNICAL LIBRARY

 

High Performance Circular Screen Separator With Heavy Duty Gyrator Motor Provides Over 20 Years Of Cost Effective Service.

Pigment manufacturers and applicators know the difficulties caused by oversize grains of ingredients in pigment. In 1968, Engelhard Chemical (then Harshaw Chemical Company and later Harshaw/Filtrol) was determined to keep its pigment free from troublesome mineral grains. The Louisville, KY, company was looking for ways to ensure that their customers would never have cause for complaints due to oversize particles.

The company installed several in-line Kason VIBROSCREEN circular screen separators to ensure that the lead chromate, pigment, and water formulation was free of lumps and all extraneous material over 200 mesh size that would impair processing and pigment quality. Most of the pigment is used for industrial coatings and traffic grade paint. The 48 in. diameter units operate continuously on a 24-hour-per-day schedule or on demand. Equipped with stainless steel screens, these circular screen separators handle approximately 2000 pounds per hour (dry basis) of slurry.

According to Dan Cunagin, production manager, maintenance has been largely limited to adjusting the vibrating frequency. Tight tolerances and scheduled lubrication procedures account for the reliable service that has helped Engelhard keep on line and profitable. The 1 hp gyrator motors operate year after year.

Kason engineers also learned long ago that the horsepower of the motor was not so important as its design and the quality of the components. As a result of improved design, the gyrator contributes to low power requirements. Most separator equipment of this size use a 2 and one-half hp motor.

In the Kason design, adjustable top and bottom eccentric weights enable the machine to efficiently handle a variety of slurries. These weights are independently variable for mass and angular relationship, giving a great deal of control over all vibration components. If the mass of the top eccentric weight is increased, the horizontal throw of the screen will increase. Increasing the bottom eccentric weight increases the vertical component of motion. This encourages a maximum quantity of undersize material to flow through the screen without blinding.

The relative angular position of the top and bottom eccentric weights controls the flow pattern that oversize material will follow on the screen. Once the optimum settings have been achieved, it is an easy matter to ensure uniform performance. A simple vibration amplitude gauge applied to the vibratory circular screen separator provides a self -stick gauge that lets the operator visually check the
horizontal and vertical motion. This results in maximum efficiency.

Screen Tips - Volume 7, Number 3 Spring 1992

Circular Screen Separator Screens Pigment for 20+ Years

For more than 20 years, a Kason VIBROSCREEN circular screen separator has handled up to 2000 pounds per hour (dry basis) of slurry for Engelhard Chemical Company, Louisville, KY. Screening ensures that the lead chromate, pigment, and water formulation was free of lumps and all extraneous material over 200 mesh size that would impair processing and pigment quality.