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| Analysis of the Effect of Ultrasonic Beating on Pulp Fibers |
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| DOI：10.11980/j.issn.0254-508X.2017.04.005 |
| Key Words:bleached kraft softwood pulp mechanical ultrasonic beating |
| Fund Project:国家级大学生创新训练项目 (201610225034)。 |
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| Abstract:Bleached kraft softwood pulp fibers were beaten by the ways of mechanical, ultrasonic and mechanical-ultrasonic. The beating degrees, wet weight, morphology, bonding strength and intrinsical strength of the fibers were measured to evaluate the effects of different beating processes. Results indicated that beating degree increased rapidly with mechanical beating. When beating to 75°SR, the wet weight dropped from 12.9 g to 2.48 g, the fiber average length decreased from 2.29 mm to 0.862 mm, the uniformity was decreased by 59.6 percentage points for long fibers and increased by 25 percentage points for short fibers, the content of fines increased by 6.4 percentage points. Beating degree with ultrasonic beating raised more slowly compared with mechanical besting. When beating to 49°SR, the wet weight was 11.08 g, fiber average length and uniformity were changed slightly, the content of fines were decreased by 0.4 percentage points. When beating to 75°SR by combining mechanical and ultrasonic processes, the wet weight dropped to 6.16 g, the fiber average length decreased to 1.098 mm, the uniformity decreased by 46.6 percentage points for long fibers and increased by 16.5 percentage points for short fibers, the content of fines increased by 3.7 percentage points. At the same time, the zero-span tensile strength and tensile strength were the best with mechanical-ultrasonic process, mechanical process was better than ultrasonic. All above indicated that the beating degree increased rapidly and accompanied seriously cutting with mechanical besting. Ultrasonic beating not only promoted swelling and fibrillation of the fibers, but also reduced fiber cutting and crush. Mechanical-ultrasonic beating was the best beating method, which promoted fiber swelling, fibrillation and maintained the length of fibers. |
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