The Effect of Ink Formulations and Deinking Chemicals on the Deinkability of Newspapers According to the Aging Time

열화기간에 따른 잉크조성분과 탈묵약품이 신문지의 탈묵성에 미치는 영향

  • 안병준 (고려대학교 산림자원학과) ;
  • 백기현 (고려대학교 산림자원학과)
  • Received : 1999.04.13
  • Accepted : 1999.05.31
  • Published : 1999.08.10

Abstract

To investigate the deinkability according to the ink composition, deinking chemicals and aging time, newspaper was printed with different solvent types: 30% soy-based oil ink(A), 50% soy-based oil ink(B), 45% mineral oil ink(C) and 42% linseed oil ink(D). The newspapers were aged naturally for 15, 30, 90, 180 days, and were deinked with various deinking chemicals. The brightness of the deinked pulp of newspaper was affected by the ink composition, aging time and deinking chemicals, i.e., it was decreased with increasing aging time in the order of C, A, B and D. And the brightness also decreased in the order of lipase, cellulase and conventional chemical. The deinking yield showed the same tendency as the brightness variation at a given brightness. The strength of the deinked pulps increased until 30 days, but decreased or maintained after that time. And the strength decreased in the order of C, D, B and A, and also decreased in the order of lipase, conventional chemicals and cellulase.

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