Qingzhou City Dehai Fine Chemical Plant

Surface sizing is a process in the processing of paper or paperboard. It is usually placed at the end of the dryer section of the paper machine to form a film on the surface of the paper and paperboard by subsequent drying to achieve the purpose of changing the surface properties of the paper or paperboard. From the development of the paper industry, paper surface sizing is one of the indispensable processes. Surface sizing can add surface additives to improve the performance of paper or increase the water resistance of paper or paperboard. Originally, due to technical limitations and paper type requirements, surface sizing agents can only be used on special paper types, such as banknote paper, bond paper, and sea drawings. With the improvement of the technical level of the paper industry, the surface sizing of paper has become a routine paper processing process, especially the surface properties and strength of cultural paper, wrapping paper and corrugated paper in recent years due to the popularity of printing, copying and faxing. Water resistance puts higher demands, so the paper industry is constantly exploring new surface sizing techniques. 1) Improve the printing performance of paper and paperboard; 2) Improve the surface strength or water resistance of paper by selecting different types of surface sizing agents; 3) Improve the physical strength of paper and paperboard; 4) Surface sizing can reduce paper The difference between the two sides; 5) is not affected by the papermaking water quality and water temperature, the sizing effect is relatively stable; 6) the rubber retaining effect is good, the sizing cost is low; 7) and the internal sizing at the same time can make up for the internal sizing Some flaws. According to the function of the surface sizing agent, we are divided into water resistant and enhanced. Surface sizing agents for improving water resistance may be selected from alkyl ketene dimer (AKD), styrene maleic anhydride copolymer, etc.; optional starch, carboxymethyl cellulose (CMC), polyethylene (PVA) ) Alcohol, etc.