혼합폐지의 무염소 표백

안병준; 백기현; Byoung Jun Ahn; Ki Hyon Park

Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.7, 724-729, November, 2001

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혼합폐지의 무염소 표백

Chlorine-Free Bleaching of Mixed Office Wastepaper

안병준, 백기현^{1, †}

일본 구주대학 임산학과
¹고려대학교 환경생태공학부

Byoung Jun Ahn, and Ki Hyon Park^{1, †}

Department of Forest Products, Kyushu Universities, Japan
¹Division of Environmental Science and Ecological Engineering, Korea University, Korea

E-mail:

초록

표백방법에 따른 혼합폐지의 표백 효율을 구명하기 위하여 레이저 프린터 폐지/색지/신문폐지/잡지폐지(60 ~ 70/25/5 ~ 10/0 ~ 5)로 구성된 혼합폐지를 산화표백제와 환원표백제들을 사용한 3단계로 표백하였다. 10가지의 표백 방법 중에서 (Y 또는 FAS)ZP 와 ZP(Y 또는 FAS) 표백이 다른 표백 조합보다 백색도를 더 증가시켰다. 이와 같은 표백 방법에 의하여 초기 백색도가 약 30 ISO와 54.7 ISO인 혼합폐지들이 각 각 백색도 70 ISO 이상과 75 ISO 이상으로 상승되었다. 초기 백색도가 낮은 혼합폐지는 환원 표백 단계로 Y를, 초기 백색도가 높은 혼합폐지는 FAS를 각각 사용하는 것이 백색도 증진면에서 유리하였다. 3단 표백 후 색도의 차이, 특히 b값은 표백방법에 따라 상당한 차이가 있지만 a값은 0인 y축에 접근하였다. 인장강도와 파열강도는 표백으로 인하여 감소하였다. 이들 강도의 감소 폭은 초기 백색도가 낮은 혼합폐지에서 더욱 현저하였다. 인열강도는 초기 백색도가 높은 혼합폐지에서는 증가하거나 또는 미표백 펄프의 인열강도를 그대로 유지하였다. 그러나 초기 백색도가 낮은 경우에는 인열강도가 감소하거나 혹은 표백 전 강도를 그대로 유지하였다. 산화 표백방법 사이에 환원표백 단계를 실시할 경우, 백색도와 표백 펄프의 강도가 현저히 감소하였다.

To investigate efficiency of bleaching methods, three types of mixed office waste paper (MOW) were evaluated via a three-stage bleaching procedure using oxidative and reductive bleaching agents. The contents of MOW contained black & white laser printed paper, color laser printed paper, newspaper and magazine, and their range consisted of 60 ~ 70 %, 25%, 5 ~ 10%, 0 ~ 5%, respectively. For the brightness gains, (Y or FAS) ZP and ZP (Y or FAS) bleaching sequences were the best among ten different bleaching sequences studies. Using these bleaching sequences, MOW of 30 ISO and 54.7 ISO brightness were bleached to over 70 ISO and 75 ISO, respectively. Sodium hydrosulfite (Y) was effective in the MOW having a low initial brightness, whereas FAS was effective in the MOW that had a high initial brightness. After the three-stage bleaching, the results showed that the value of chromacity, the b value, changed considerably depending on a type of bleaching method used, but a value remained constant, near zero. The tensile and burst strength were decreased by the three sequences bleaching. Such decrease in strengths was prominent in MOW having a low initial brightness than a high initial brightness. The tear strength was increased or remained unchanged in a MOW that had a high initial brightness, but the strength decreased or remained unchanged in a MOW with a low initial brightness. The oxidative-reductive-oxidative bleaching sequence reduced the effectiveness of both the brightness gains and the bleached pulp strengths.

Keywords:oxidative bleaching;reductive bleaching;mixed office wastepaper;brightness;lab;strengths

[References]

Kogan J, Perkins A, Muguet M, Tappi Proc. Recycling Symp., 139, Atlanta, GA (1995)
Jobbins JM, Heise OU, Tappi Proc. Recycling Symp., 27, New Orleans, LA (1996)
Sharpe PE, Tappi Proc. Recycling Symp., 157, Atlanta, GA (1995)
Popson SJ, Malthouse DD, Robertson PC, Tappi proc. Recycling Symp., 127, New Orleans, LA (1996)
Granfeldt T, Grunstrom P, Lary E, Pulp Pap. Can., 98(1), 62 (1997)
Szczucki CL, Kilgannon RR, Tappi Proc. Recycling Symp., 57, New Orleans, LA (1996)
Naddeo RC, Szczucki CL, Moss C, Tappi Proc. Recycling Symp., 69, New Orleans, LA (1996)
Alder MG, Hill GH, J. Am. Chem. Soc., 72, 1884 (1950)
Boucharad J, Nugent HM, Berry RM, TAPPI J., 78(1), 74 (1995)
Darlington B, Jezerc G, Kulikowski T, Magnotta V, Naddeo R, Waller F, White-Gaebe K, Proc. Pira Conf. Developments Wastepaper Technol., 18, Surrey, UK (1993)
Kapel J, Matzke W, Proc. Paper Recycling Conf., 1, London, UK (1994)
Muguet M, Kogan J, Proc. Paper Recycling Conf., 1, London, UK (1994)

[Referenced By]

[1] Kogan J, Perkins A, Muguet M, Tappi Proc. Recycling Symp., 139, Atlanta, GA (1995)

[2] Jobbins JM, Heise OU, Tappi Proc. Recycling Symp., 27, New Orleans, LA (1996)

[3] Sharpe PE, Tappi Proc. Recycling Symp., 157, Atlanta, GA (1995)

[4] Popson SJ, Malthouse DD, Robertson PC, Tappi proc. Recycling Symp., 127, New Orleans, LA (1996)

[5] Granfeldt T, Grunstrom P, Lary E, Pulp Pap. Can., 98(1), 62 (1997)

[6] Szczucki CL, Kilgannon RR, Tappi Proc. Recycling Symp., 57, New Orleans, LA (1996)

[7] Naddeo RC, Szczucki CL, Moss C, Tappi Proc. Recycling Symp., 69, New Orleans, LA (1996)

[8] Alder MG, Hill GH, J. Am. Chem. Soc., 72, 1884 (1950)

[9] Boucharad J, Nugent HM, Berry RM, TAPPI J., 78(1), 74 (1995)

[10] Darlington B, Jezerc G, Kulikowski T, Magnotta V, Naddeo R, Waller F, White-Gaebe K, Proc. Pira Conf. Developments Wastepaper Technol., 18, Surrey, UK (1993)

[11] Kapel J, Matzke W, Proc. Paper Recycling Conf., 1, London, UK (1994)

[12] Muguet M, Kogan J, Proc. Paper Recycling Conf., 1, London, UK (1994)