Abstract
SUMMARY: The refining is the mainly techniques used to recover paper quality during the recycling process. However, this technique also results in undesirable effects. In this study the potential of ultrasonic treatment to develop the mechanical properties of recycled waste papers was evaluated. Ultrasonic energies were applied at 20 kHz with an intensity of 190 Watts into 1 liter batches of re-pulped OCC at consistencies of 0.5 to 4%, pH levels of 7 and 10, and time increments of 5, 10 and 20 minutes. Sheets were made and evaluated for bulk, ring crush test, tear index and tensile index. Pulps were additionally processed in a PFI mill and compared with the results of the ultrasound trials at equivalent o SR. Pulp consistencies didn’t affect the ultrasonic treatment. The use of higher pH and treatment time favored the development of paper properties. To the same value of tensile index, the ultrasonic treatement produced sheets with higher bulk than the PFI. The results indicate that the ultrasonic treatment of the pulp can be used to improve the properties of recycled waste paper.
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