شناسايى مواد حسبناك ومنشأ آنها دركارخاذه توليد كاغد بستهبغدى

Sticky contaminants present one of the biggest technical challenges in the paper recycling process. These contaminants reduce paper strength, cause plugging of wires and felts, and stick to or deposit on machine parts affecting the runnability of the paper machine. In this study, first, the sticky deposit on doctor blades was subjected to multi-stage extraction with alcohol, acetone, toluene, and tetrahydrofuran solvents respectively. Then the nature of the resulting material and its physicochemical properties was investigated with FTIR analysis, GC-MS, TGA, XRF, SEM. The results showed that these deposite originates from the fibers, polymers such as polyvinyl acetate and styrene butadiene, which are components of hot melt adhesives, and fatty acid/resin esters. Fatty acids and resins are the most common organic compounds in stickies deposite. The possible origin of these compounds are chemical substances (saponified fatty acids), deinking steps and some resins and fatty acids used in the formulation of adhesives or more resistant resins and extractive materials related to cellulosic fibers. The identified minerals are mainly calcium, iron, silica and aluminum, which are present in the formulation of fillers and coating pigments during the papermaking process. [ABSTRACT FROM AUTHOR]