• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.29 no.2
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• pp.16-24
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• 1997

This experiment was mainly performed with a biological treatment of laser printed paper using enzyme, We got the following conclusions : In the case of nonionic surfactant treatment, brightness, residual ink contents and several strength properties of deinked paper were excellent at the low dosage of cellulase 0.05%. When mixed cellulase and xylanase was used, yield was increased as the dosage increased up to 0.2%, but brightness was decreased at the same condition. In contrast, deinking efficiency of anionic type was reduced in terms of brightness, residual ink contents, and tensile strength. As flotation time was increased, yield decreased and brightness increased slightly. On the other hand, the addition of surfactant during repulping process showed better result than that during flotation process.

• Proceedings of the Korean Printing Society Conference
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• 2001.06a
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• pp.46-60
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• 2001

본 연구는 전기화학적으로 제조된 초환원수 수용액을 탈묵에 적용하기 위한 연구로서 수용액의 알카리도가 고지의 젖음성에 미치는 영향과 그에 따른 탈묵성에 미치는 영향을 고찰한 것이다. 초 환원수는 고전압 하에서 순수 물을 전기적으로 분해한 것으로서 양극에서 pH가 약 11이상의 것을 얻어 사용하였다. 물의 알칼리도에 따라서 탈묵제가 펄플에 젖음성의 영향을 살펴보았으며, 특히 펄프 입자의 표면 전하에 큰 영향을 미쳤다. 이에 따라서 잉크 입자의 탈착이 효과적으로 진행됨이 관찰되었으며, 탈착된 잉크 입자의 크기도 탈묵에 적절함으로서 탈묵 효과가 향상되었다. 이러한 현상을 사용된 계면활성제, 물의 알카리도, 펄프 및 잉크의 표면 전화, 친수/소수화도 등과 비교 검토하였다.

• Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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• 1999.11b
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• pp.149-152
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• 1999

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.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.30 no.4
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• pp.1-11
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• 1998

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.37 no.1 s.109
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• pp.25-37
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• 2005

This study was carried out to examine the optimal cultural condition in enzyme activities of CMCase, FPase and xylanase in selected strains which secret extracellular enzymes for using deinking agent to old newsprint. The results of this study were as follow: The production of enzyme by Bacillus pumilus I was maximal as grown on the medium, containing of rice bran+xylan $2.0\%$, peptone $0.8\%,\;K_2HPO_4\;0.1\%\;and\;CaCl_2\;0.06\%$ at pH 8.0 and $28^{\circ}C$ for 72 hours. Optimal cultural condition of B. subtilis I was avicel+xylan $3.5\%,\;urea\;0.4\%,\;K_3PO_4\;0.1\%\;and\;CaCl_2\;0.015\%$ at pH 9.0 and $28^{\circ}C$ for 36 hours. The maximal enzyme production was observed in the medium, containing of avicel+xylan $3.5\%,\;urea\;1.6\%\;and\; K_2HPO_4\;0.125\%$ with pH 9.0 when B. pumilus II was cultured at $28^{\circ}C$ for 60 hours. The production of enzyme by B. subtilis IT was maximal as grown on the medium, containing of xylan $2.0\%,\;yeast\; extract\;0.6\%,\;K_2HPO_4\;0.1\%\;and\;ZnSO_4\;0.04\%$ at pH 8.0 and $34^{\circ}C$ for 36 hours. The activities of FPase and xylanase in tested 4 strains were not much different with Thermomonospora fusca.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.09a
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• pp.250-251
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• 2005

• Resources Recycling
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• v.5 no.4
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• pp.3-10
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• 1996

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.37 no.1 s.109
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• pp.47-52
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• 2005

Enzymatic pulping properties of mixed office waste paper in standard disintegrator were investigated for successful enzymatic deinking of mixed office waste paper. Enzymatic pulping need more revolution in standard disintegrator than alkaline pulping and Cellusoft need more revolution than Denimax. The freeness of disintegrated pulp with enzyme was higher than those of disintegrated pulps with alkaline and heat killed enzyme. The freeness of disintegrated pulp with Denimax was higher than that of disintegrated pulp with Cellusoft. The freeness of disintegrated pulps were increased with a dosage of enzymes. The mechanical properties of disintegrated pulp were improved with enzyme addition comparing with heat killed enzyme. The tensile and burst index of hand sheet of disintegrated pulps with acidic Cellusoft were higher than that of others.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.37 no.1 s.109
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• pp.53-60
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• 2005

The mechanical properties of deinked mixed office waste paper in relation to sorts and dosage of enzymes were investigated for successful enzymatic deinking of mixed office waste paper. The increasing of $\Delta$. freeness was most predominant in pulp of Denimax treated pulp. The tensile and burst properties are decreased with enzyme dosage while $\Delta$. freeness were increased. The fine content in disintegrated pulp was decreased with enzyme dosage of $0.4\%$ on the dried weight of paper. The water absorption of handsheets of enzyme deinked pulp was like as that of market roll tissue papers and the mechanical properties of handsheets of enzyme deinked pulp were improved with enzyme treatment comparing of market roll tissue papers.

• Resources Recycling
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• v.5 no.4
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• pp.11-16
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• 1996

In the flotation system for deinking process, the ink partcles musl collidc with the air bubbles for adhesion The probability of bubble-particle collision is largely dependent on the hydrodynamic conditions The main reason for the very small ink particles not to be able to float easily may be tound in the hydrodynamic effects, which make small ink particlcs move following the slreamlines around the bubbles rather than achually collide with bubbles. Also. the low floatabdily of the large and heavy ink particles is due to the gravity force and viscous drag which affect uprising molinn of particles through the liquid. Therefore, it is vely important to control not only the surface chemical conditions but the hydrodynamic conditions in practical floialion system