Date of Award

6-1954

Degree Name

Bachelor of Science

Department

Pulp and Paper Technology

First Advisor

Dr. Alfred H. Nadelman

Abstract

Mannogalactans and particularly locust bean gum are used for a wide variety of applications. They serve as thickening agents and emulsifiers for foodstuffs, in sizing as well as finishing yarns and in creaming rubber latex. The papermaking industry is the largest user of mannogalactans. Here they are used in kraft grades, sulphite, book papers, coating raw stock, offset and printing grades, bonds, ledgers, and other fine papers and also in newsprint and other groundwood sheets.

Locust bean gum and methylcellulose are effective as deflocculating agents and are said to surpass the performance of deacetylated karaya gum. Both hydration film and electrokinetic potential on the fiber are involved in fiber flocculation and dispersion (1). Locust bean gum responds to a minimum extent when used with hardwoods. However, mixed hardwood-softwood sheets, produced with a relatively high percentage of hardwood, still maintain appreciable strength properties when locust bean gum is used. Gray and Van den Akker (1) found that an addition of one percent locust bean gum greatly reduced the friction of high consistency stock in pipes.

Mannogalactans, when used as beater additives will tend to increase the retention of some types of fillers. Usually the stock is beaten to maximum tear before addition of the gum. An automatic continuous dispenser has been developed (18), that supplies cooked additive to paper-machines in quantities up to 20,000 gallons per day.

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