Enzymatic Control of Stickies in Recycle Paper

One of the most important problems in recycled paper and paperboard is stickies. When the recycle paper converting to the pulp, this stickies will deposition on the paper machine, dryer and wires and decreases the quality and tear strength of paper. Recently in paper recycling to control the stickies and pressure sensitive adhesive (PSA) utilize the enzyme technology that performance is very high. Pressure sensitive adhesive (PSA) is one of the types of stickies found in recycled paper. In this study we focused on effect of controlling pressure sensitive adhesive (PSA) in recycled Old Corrugated Containers. In this research we use some enzymes including Lipase and Esterase to controlling the pressure sensitive adhesive. Pressure sensitive adhesive and stickies contain a large number of ester linkage. Esterase and lipase enzymes could break these links. Stickies become to finer particle due existing Steras and Lipase and help to better removal and more complete. Also these enzymes changed the surface adhesion of pressure sensitive adhesive and reduce the adhesion strength. By controlling the enzyme could remove the viscous material about 70 to 90 percent. Remove the stickies and pressure sensitive adhesive of recycled paper by enzymes improve their optical and resistance properties.