Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


It is the purpose of this thesis to investigate possible means of rendering latex-based pressure sensitive adhesives innocuous in currently operating secondary fiber systems.

It has been found that certain solvents will effectively attack and disperse latex-based pressure sensitive adhesives when used in solutions of 0.5 to 1.0 percent depending on the end product.

This involves presoaking the contaminated stock prior to defibering for varying amounts of time depending on the amount of contamination, the type of adhesive present, the temperature and pH parameters currently in use in each specific system.

It is also evident that contaminant build-up on equipment may be problematic also depending on the amount of contamination, the percentage of dispersant and the amount of agitation involved in the pre-soaking reaction vessel. The amount of equipment build-up was found to be minimized by increasing the peripheral speed of the pre-soaking slurry, thus increasing the slurry to reaction vessel contact. Contamination build-up on the defibering device was not encountered.