Decker Thickner operates decker or rotary filter machines to remove water from pulp stock and reduce stock to specified consistency for bleaching or beating: Turns valves to regulate flow of pulp stock into machine vat. Starts machine and adjusts controls to regulate speed of cylindrical screen in vat.

Turns valve to adjust suction in cylinder to deposit pulp on screen at specified rate and remove white water through meshes of screen.

Turns hand wheels or pulls lever to adjust press roll against screen to obtain pulp of specified consistency. Pulls lever to adjust blade that scrapes pulp from screen into storage chest. May tend flat or rotary screens to remove coarse fibers from pulp.

Decker ThicknerDecker / Washer:
The decker / washer has two functions. One function is the thickening of the pulp slurry fed to it. Secondly is the washing action of draining away water that contains residual minute ink particles and ash for brightness enhancement. Accepts from the forward cleaners flow to one of two decker / washers. Consistency of the forward cleaner accepts supplied to the decker / washer is 0.58 percent. Accepts from the gravity decker / washer are diluted to 3.5 percent and sent to the second press.

Control:
Control for the decker / washer works off the tub level. As the level increases the speed of the drum’s rotation increases to control level. Generally, every deinking system has at least one stage of washing for the removal of fine ink and ash; this system utilizes two washing cycles through this stage of the process.