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Retention of cationic dispersed rosin size was studied via turbidity measurements on stock filtrate with different alum and dispersed rosin size dosages. Stock charge characteristics were analyzed using both an analysis of charge demand determined via a streaming current detector and an evaluation of zeta potential of the fibers by streaming potential measurement. The results indicated that an optimum amount of alum existed such that good sizing retention was maintained throughout a wide range of dispersed rosin size dosages. However, when an excessive amount of alum was used and fines and colloidal particles were transitioned from anionic to cationic, the cationic size retention was reduced. Laboratory results were confirmed with a paper machine trial. All data suggested that a stock charge study was necessary to identify optimal alum dosage for a cationic dispersed rosin sizing program. [ABSTRACT FROM AUTHOR]

The article discusses the influence of wet-end variables on the sizing efficiency of alkenyl succinic anhydride on fine papers created with Eucalyptus globulus kraft pulps. It states that the purpose of paper sizing is to make paper more resistant to liquid penetration. It explains that alkenyl succinic anhydride is a synthetic agent used in sizing that is usually involved in alkaline papermaking. It mentions that the synthetic agent has a fast curing size, but it can lose its ability if it is in contact with water.

The article presents a study which aims to evaluate the efficiency of a starch-fatty complex modified filler as an alternative method for papermaking. These starch-filler composites are known to improve the filler-fiber bonding in paper including its physical property, filler retention and the sizing effect. Results show that the starch-fatty acid complexes have low solubility, making it easy to be coated on clay surface to modify clay-fiber bonding ability. Researchers also noted that paper strength could increase up to more than 100 to 200 percent by using this method. Furthermore, it has been found that the presence of fatty acids in the complex increases the water-repellant property of the handsheet which can be used to facilitate sizing during papermaking.

Four cationic dispersed rosin sizes were studied in terms of their performance when pH, temperature, and water hardness were varied. Three of the sizes were based on fortified rosin with different concentrations of fumaric acid, and the fourth size was based on esterified rosin. Statistical tools are used to refine and simplify an earlier model proposed by Nitzman and Royappa, who first examined the relationship between sizing and the factors of pH, temperature, water hardness, and fortification. The simplified models provide some insight into the differences between esterified sizes and fortified sizes in terms of paper sizing. Based on the algorithmic modeling approach, guidelines are proposed for choosing different levels of pH, temperature, and water hardness for use with different rosin sizes. [ABSTRACT FROM AUTHOR]

The article presents an experimental research on polyethylene terephthalate (PET) polymers for making paper washbowls that can hold hot soapy water for a minimum of four hours by the use of wet-end technology. It states that this experiment is intended to contribute to the development of new technologies for high-temperature paper sizing. The washbowls are to be made out of recycled newspapers and telephone books to be used in the hospitals which can be recycled, need not be incinerated, and would lead to labor savings. Included are the list of materials needed, formula and steps, and the photographic views of the finished products. Results and conclusions are also provided which state that the main objective to develop a secondary fiber suitable for printed paper application is obtained.

This investigation of the mechanism of premixing alum-rosin size for neutral-alkaline papermaking conditions focused on the mixture solution charge and particle size distribution. The effect of the mixture concentration, temperature, and ratio of alum to rosin on the rosin-alum size efficiency was studied theoretically. [ABSTRACT FROM AUTHOR]