Date of Award

4-8-1980

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

A study was performed to determine the effectiveness of NaCMC, as an anti-redeposition agent on newsprint, in a flotation deinking system. NaCMC performs the function of preventing soils from redepositing in many commercial laundry detergents. The study used six different surfactants; five were nonionic, and one was anionic. The effect of NaCMC was studied at three different levels of addition~ 0.05%, 1.0%, and 5.0%. One set of handsheets was produced with peroxide for comparison purposes. The effect of pH at 9.0, 10.0, and 11.0 with NaCMC was also studied. The data indicates that NaCMC does act as a redeposition agent in nonionic flotation systems. The strength as measured by mullen significantly increased at 5.0% level of NaCMC addition. NaCMCdoes not appear to be compatible with anionic surfactants and NaCMC does not significantly increase brightness of the deinked pulp.

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