Cationic Starch Description

Cationic Starch

Basic properties of Cationic Starch;

We have conducted research on the effect of the degree of substitution of the cationic starch on its retention on the fibers, paper and strengthening the effectiveness of AKD neutral sizing. A Cationic Starch in an amount of 8kg/ton pulp is fed into the bleached softwood pulp SFA/leaf at a ratio of 1/1. In addition a cationic pulp starch was fed AKD emulsion in an amount of 8 kg/ton.

Cationic Starch is almost completely (over 90%) is retained on the cellulosic fibers even under a very small degree of substitution - 0.01 mol/mol or higher. Natural Starch under these conditions is kept at 30-40%. When the degree of substitution of 0.030 and Cationic Starch is retained up to more than 95%.

Cationic Starch and effectively holds the fiber particles attaches the AKD emulsion glue, but the effect is clearly seen when the degree of substitution above 0,020-0,025 moles/mole. Natural starch does not affect the retention of neutral glue, because of the greater adsorption of the cationic starch to the fibers and provides a larger increase in strength properties of the paper. In our case, the paper is tested for energy ties fiber on a "Scott-Bond." Effective hardening achieved starches with a very low degree of substitution. It may be noted that the curves 1 and 3 are well correlated. About methods for controlling the properties of recycled paper pulp fibers in the course of research, we came to the conclusion that some of the most important characteristics of the recycled pulp are the following:

• The concentration (content) of dissolved starch in the white water.
• The mass rate of dehydration under standard conditions.
• The turbidity of the clarified and recycled water. Consider these figures in more detail. Concentration or content of dissolved starch in the white water. Characterized primarily by the degree of pollution coming deinking starch and, consequently, the tendency to corrupt the masses. It was dissolved starch is a great food for microorganisms, and mucus is their waste products. Practical experience with the enterprises showed that the concentration of dissolved starch in the white water is from 30 to 100 mg/l, but in some plants, is 160 mg/l. In terms of fiber means, such that in the head box at a concentration of 0.32% weight of the dissolved starch is 50kg/m That's a lot, and cannot create any problems. The bulk of soluble starch comes from waste paper of corrugated boxes. Thus, the concentration of dissolved starch is characterized on the one hand the quality of the incoming waste paper, and on the other - the main reason for the technological difficulties that would come or have already come. Speed dehydration weight under standard conditions. It characterizes the rate of dehydration or weight per formers forming table and determines the performance of the equipment. The difference between the methods is that the degree of grinding is determined by significantly diluting the thick mass of fresh water, and thus obtained values characterizing the properties of the fibers themselves, when determining the drainage time using the mass of the head box, without dilution with fresh water, whereby a set of characteristics of the fiber as and the properties of the circulating water. In the presence of dissolved starch and its damage, while dehydration mass characterizes not so much the degree of development and grinding fibers as water-holding capacity of the fibers in the presence of the substances and mucus dissolved starch, which increases the viscosity of the aqueous system. It is known that if the fiber is designed to obtain high that the mechanical strength of paper and paper board is very difficult. But it so happens that you cannot raise the degree of grinding, since the mass and so badly dehydrated on the forming table. Rotten weight of bad press, scores cloth enters the dryer section with high humidity and requires increased steam flow for drying. Thus, the rate of dehydration mass taken from the head box, in addition to the freeness mass suggests why at low freeness mass forming table works poorly, dry cloth pressed low and high steam consumption. Sometimes vice versa. By using an efficient dewatering system based on modern chemical dewatering rate of mass can be very high even at high freeness fibers. This is the best version of the work, as due to the higher degree of beating effectively achieved strength of cardboard and paper, but the performance of the equipment and steam consumption without deteriorating.

Cationic Starches with a degree of substitution of 0.050 and above is especially ended for systems of heavily contaminated (high haze), because have high cationic charge density and are more apt to break the protective shell of the colloidal particles stabilized pulp. Apply these starches is useful when starch with a lower degree of substitution is not working satisfactorily. Thus it is necessary to pay attention not only on the degree of substitution, but also on the basis of natural starch and a retention system in general. Program application and use of cationic starch and oxidized develop individually for each enterprise. Provide scientific and technical support for all subsequent cooperation.