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| Measurement of the Surface Viscosity of Stickies in Waste Paper Pulp Based on the Simulation of Peeling Sticky Films |
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| Key Words:stickies surface viscosity peeling strength deposition area water drainage property |
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| Abstract:Stickies are easy to adhere onto dryers, belts and other parts in papermaking process, thus affecting paper product quality. Traditionally the effect of stickies on papermaking process is evaluated by testing its deposition area and amount. Those methods cannot characterize the surface viscosity of the stickies and its harm to papermaking process. A new method based on testing the peeling strength of two films coated with stickies was proposed in the study. The effect of system change on surface viscosity and the effect of surface viscosity on the deposition property and drainage property were analyzed by testing the surface viscosity of different stickies model substances. Results showed that the surface viscosity of the stickies in the pulp adding PA was the highest, the addition of inorganic salt and the temperature increase could increase the surface viscosity; the increase of the surface viscosity led to the increase of deposition. When the peeling strength of PA increased from 0.1607 N/mm to 0.7676 N/mm , the deposition area of stickies increased from 3997.3 mm2/ m2 to 24226 mm2/ m2, the number of stickies increased from 8760.4 per square meter to 96750 per square meter, the drainage property of pulp became worse and the maximum drainage weight decreased by 14 g in unit time. |
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