Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference (한국펄프종이공학회:학술대회논문집)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
권호 표지

DEINKING OF COLORED OFFSET NEWSPRINT WITH ENZYME TREA TMENT IN COOPERATION WITH ULTRASONIC WAVE

  • Yimin XIE (State Key Laboratory of Pulp & Paper Engineering, South China University of Technology) ;
  • U, Hong-W (State Key Laboratory of Pulp & Paper Engineering, South China University of Technology) ;
  • Yanming LAI (State Key Laboratory of Pulp & Paper Engineering, South China University of Technology)
  • Published : 1999.11.01

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Abstract

A new process for deinking of colored offset newsprint, i.e. enzyme treatment in cooperation with ultrasonic wave was developed in the present study. The physical characteristics such as fiber length, coarseness, crystallinity index of the deinked pulps were investigated and the sugar residues released from the treatment were analyzed. It was found that colored offset newsprint could be deinked effectively by cellulase treatment when ultrasonic wave was applied. The brightness increased by 5% ISO over that of control experiment and the pigment content was reduced markedly. Though the ultrasonic wave had little effect on the strength and crystallinity of the pulp, the treatment of enzyme combined with ultrasonic wave reduced the coarseness and fiber length to some extent. It was also found that ultrasonic wave could accelerate the hydrolysis of cellulose and hemicellulose during the cellulase treatment.

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