Study On Stickies Remove And Production Of The Steam Explosion In Waste Coated Art Paper

Because coated art paper adding a lot of non-fiber material in the manufacture of paper and arising obstacles from the production process in reuse of waste paper, looking for a low cost and effective method of removing Stickies now becomes a hot research. Stickies chemical group of waste coated art paper (WCAP) are separated and identified in steam explosion process. Understanding the main ingredients of Stickies and choosing the appropriate way to remove or reduce the content of Stickies, it is conducive to operate smoothly in the pulp and papermaking process and to improve the quality of the final product. This study focused on the waste coated art paper steam explosion to remove Stickies's process conditions, the Stickies chemical composition analysis in expansion process, Simultaneously, the advanced analytic technology of SEM, IR spectrum as well as X-ray diffraction spectrum were used to analyze the microscopic mechanism of explosion pulp. The discussed results of the study were as follows:(1) According single factor experiment and orthogonal experiment, it proves the optimum conditions of WCAP: expanded pressure of 0.5 MPa, heat preservation time 10 min, liquid ratio 1:5, NaOH charge 2%, Na₂SiO₃ charge 2%.(2) Compared the removing effect of stickies in explosion with chemical and physical method, explosion method is more conducive to remove the Stickies.(3) FTIR analyzes ethanol and chloroform extraction in explosion pulp, we can see that after Expanded the adhesive material basic structure has not changed, only the Stickies polymer molecular weight increase or decrease.(4) The SEM analysis shows that in the expanded processing WCAP's fiber had been better dispersion, the fiber were loose soft, slurry into good effect. And the fiber surface adhesion Stickies basic removal, the removal efficiency significantly.(5) IR spectrum shows that in the expanded processing cellulose characteristic absorption peak strength of the relative absorption increased, and some fiber absorption peak intensity change, the main chemical structure did not change significantly.(6) the X-ray diffraction spectrum analysis shows that the relative crystallinity of fibers increase, there are a crystallization of the district and the change of crystal of the crystallization.