Improvement of waste paper pulp properties by using aspen high-yield pulp

Because of the public environmental awareness growing and Fibrous raw material shortage, waste paper recycling has received widespread attention, increased year by year. Waste paper fiber through the whole process of pulping and papermaking, different production processes and the use of environment, waste paper fiber can occur in many different changes compared with the original fiber, accordingly the paper properties change.In this study, a high-quality aspen high-yield pulp (HYP) was used to improve the Waste paper pulp properties at the laboratory scale.The results indicate that adding 25% aspen HYP into unrefined or refined Waste paper fiber can minimize many of the drawbacks associated with Waste paper fiber: improving its drainage, bulk, and opacity. And addition of a small amount (about 1%) of cationicstarch can also significantly increase the tensile index of OCC.