عنوان مقاله [English]
نویسنده [English]چکیده [English]
Nowadays, annual consumption of paper in the world and also in Iran is growing. To provide the present need, finding new ways to optimum usage of lignocellulosic resources and improved production methods are required. One of the common problems in the papermaking industry is existence of undesirable compounds and by-products such as pitch, stickies and external contamination in papermaking process that each of these materials may arise from various sources. Wood, a raw material for pulping, because of having hydrophobic materials such as waxes, lipids, fatty acids, resin acids, hydrocarbons, etc, can be the origin of these contaminants. The pitch can cause significant problems in papermaking equipment. For example, it can block drainage felt or attach to wire or drying cylinders and cause holes in the paper. Up to now, various methods have been proposed to control and eliminate these problems. Enzymes due to have various applications such as pitch control, reducing the time of refining, helping in pulp dewatering, improving bleaching efficiency and increasing pulp yield, have gained a lot of popularity in pulp and paper industry. Enzymes cause to hydrolize triglycerides and prevent their formation. Furthermore, enzymatic treatments is the basis of pitch and stickies control which can be used to reduce the size of these materials. In this paper, efforts are done to investigate utilization of enzymes as a new method base on biotechnology to control pitch in papermaking process.