Date of Award


Degree Name

Bachelor of Science


Pulp and Paper Technology

First Advisor

Dr. Alfred H. Nadelman


This thesis is a study of pulp washing methods and factors influencing their operation. The literature survey is a discussion of diffusers, deckers, vacuum washers, screw presses, and inclined screen or side hill washers and methods of evaluation of washing systems.

Experimental work consisted of the analysis of the efficiency of a laboratory model inclined screen washer from the standpoint of suspended and dissolved solids removed and rate of flow. The experiments were run with deinked waste paper stock at four angles.

The results obtained indicated that an improved design of the inclined screen washer is necessary and suggestions along this line are offered.