Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


Four different molecular weight grades of carboxymethylcellulose were used in combination with polyamide epicholrohydrin resin to study wet strength development. Noble and Wood handsheets were made with deionized water, using a white water recirculation system. Resin was added to thick stock followed by CMC, in dilute conditions. Wet and dry tensile strength were tested. Increasing CMC molecular weight increased dry strength. Increased CMC molecular weight had no effect on wet strength. CMC addition with resin increases wet strength.

CMC increases wet strength by a carboxyl group reaction with resin which results in increased resin retention. It was concluded that increased dry strength resulting from CMC addition, occurs by a bridging mechanism.