• Title/Summary/Keyword: Old newsprint

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Enzymatic Deinking of Old Newsprit with Alkalophilic Enzymes from Coprinus cinereus 2249

  • Lee, Jung-Myong;Eom, Tae-Jin
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.5
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    • pp.12-17
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    • 1999
  • This study was to evaluate applications of the alkalophilic enzymes from Coprinus cinereus 2249 with old newsprint(ONP). A enzymatic deinking process based on alkalopholic enzymes was investigated . It was found that alkalophilic enzymes could effectively deink old newsprint. When applied on deinking of the old newsprint, it increases the freeness and brightness due to effect of hydrolysis at 0.1% enzyme concentration . Also, the physical properties of deinked pulp were improved.

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The Analysis of Manufactured Cellulose Acetate Using Old Newsprint by Acetosolv Pulping (초산펄프화법에 의해 신문고지로부터 제조된 셀룰로오스 아세데이트의 분석)

  • 임부국;이종윤;양재경;장준복
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.35 no.1
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    • pp.41-47
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    • 2003
  • Recently, interest in utilization plan of recycling paper have been enhanced. Therefore, this research aimed to develop the manufacture process of cellulose acetate using old newsprint by acetosolv pulping process. And the manufactured cellulose acetate was also analyzed, especially based on chemical properties. The summarized results in this research were as follows; Reaction time, kind and amount of catalyst, and ratio of liquor to material were varied during acetosolv pulping process of old newsprint. Ratio of liquor to material did not give the significant difference in reaction product. Delignification rate was increased with increasing reaction time during acetosolv pulping, but yield and degree of substitution decreased with increasing reaction time. Sulfuric acid are better catalyst than hydrochloric acid in acetosolv pulping process for old newsprint, and optimal addition amount of catalyst was 1% based on reaction material. Delignification, yield, and degree of substitution were influenced by the catalyst and reaction time. Under pulping condition of $120^{\circ}C$ in 1/12 liquor to material ratio and 60min, degree of substitution was about 0.7. The acetylation reaction was not completely caused by these reaction condition. The examination of the FT-IR spectra revealed that absorption band(1200$\textrm{cm}^{-2}$, 1,750$\textrm{cm}^{-1}$) caused by carbonyl group were confirmed.

The Comparison of Deinkability of Domestic, Japanese and Australian Old Newsprint (열화기간에 따른 국내 및 수입 신문고지의 탈묵성 비교)

  • Kim, Yong-Sek;An, Byoung-Jun;Paik, Ki-Hyon
    • Applied Chemistry for Engineering
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    • v.10 no.2
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    • pp.299-303
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    • 1999
  • In this paper, to investigate the deinkability of domestic and Australian old newsprint according to aging time, two types of newsprint printed with commercial offset ink in domestic(K; Korean newsprint, C; Canadian newsprint), Japanase(J) and Australian(A) old newsprint were aged naturally for 10, 30, 90, 180 days, and then yield, brightness, fiber length, and physical properties (tensile index, tear index, burst index) were evaluated according to aging time. As the aging time increased, the yield and brightness of respective samples decreased. The brightness and yield were decreased in the order of A, K, J and C. The brightness and strength of newsprint varied according to the ink formulation and kinds of pulp and wood. The decreasing order of strength is subsequently J, K, C and A.

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Increase of the Mixing Ratio of KONP in Producing Newsprint (신문용지 생산에 있어서 국내 신문고지 혼입량 증대에 관한 연구)

  • 백기현;김용석;안병준;손상돈
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.31 no.1
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    • pp.1-9
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    • 1999
  • This study was performed to investigate the deinkability of Korean old newspaper(KONP) and the properties of newsprint made from deinked pulp with some addition of virgin pulp. When the samples of composed of 50% Australian old magazine(AuOMG) and 50% KONP were compared with the samples 50% AuOMG and 50% AuONP, the yield, opacity, strength properties of the former were high, but its brightness was low. When the mixing ratio of AuOMG : AuONP : KONP was 30:20:50, the brightness and strength properties were obtained the similar or better than those obtained samples having other mixing ratio. The brightness and opacity of samples made from deinked pulp with the some addition of TMP and BKP can meet the minium qualifications of brightness and opacity specified by Japanese Industrial Standard. The samples, which DIP, TMP, and KP were mixed with the ratio of the 85:10:5 and 90:5:5, maintained higher brightness and strength comparing to the samples containing higher amount of virgin pulp. Since the newsprint samples made from KONP was not inferior to those from imported old newspaper, the more use of KONP in producing newsprint is recommended.

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Screening of Microorganisms Secreted High Efficient Enzymes and Properties of Enzymatic Deinking for Old Newsprint(II) - Isolation and screening of fungi producing cellulase and xylanase- (고효율 효소를 분비하는 균주의 선발 및 신문고지의 효소탈묵 특성(제2보) -Cellulase와 Xylanase를 생산하는 Fungi의 분리 및 선발-)

  • Park Seong-Cheol;Kang Jin-Ha;Lee Yang-Soo
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.36 no.3
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    • pp.9-14
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    • 2004
  • The useful fungi which secret extracellular enzymes was selected for deinking agent of old newsprint. Five fungal strains were isolated from a paper mill soil ground. The CMCase, FPase and xylanase activities of fungi on the liquid culture were investigated at optimal growth conditions. The results of this study were as follow: The optimal pH and temperature for culture growth were 4~8 and 27~$35^{\circ}C$, respectively. For screening of extracellular enzymes at optimal culture conditions the optimal culture period were less than 6-7 days. Fusarium pallidoroseum and Aspergiilus niger which shows relatively higher CMCase, FPase and xylanase activities than the other species were selected for further enzymatic deinking research.

Deinking process of Old Newsprint(ONP) by using Modified Cellulase with synthesized copolymer (기능성 고분자를 이용한 수식 셀룰라아제의 폐 신문용지 탈묵에 관한 연구)

  • Kim, Honghyun;Kwak, Tae-Heon;Park, Jinwon;Park, Kwinam
    • Clean Technology
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    • v.10 no.4
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    • pp.195-201
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    • 2004
  • Cellulase was modified with copolymer with polyethylene(PE)/polypropylene(PP) oxide and maleic anhydride(MA) by maleylation reaction, and modified cellulase was applied to the reprocessing of old newsprint (ONP). Cellulase of modified cellulase enhanced the detachment of ink particles by fibrillation of fiber. The copolymer, which acted as the surfactant formed bubbles and removed the ink particles in the floatation process. Modified cellulase showed the same deinking ability without excess dosage compared with the conventional method. And, it improved the physical properties including tensile strength, brightness, and whiteness compared with the conventional deinking process. The bond between the ink and fiber got stronger as the storage time increased, and it became very difficult to remove the ink particle. But, modified cellulase increased the deinking ability by 41% compared with the conventional process at the experiment of the ONP for 1 year storage time. It removed the yellowing and increased the whiteness and brightness as well as tensile strength and internal bond strength.

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Screening of Microorganisms Secreted High Efficient Enzymes and Properties of Enzymatic Deinking for Old Newsprint(III) -Production of bacterial cellulase and xylanase for enzymatic deinking of old newsprint- (고효율 효소를 분비하는 균주의 선발 및 신문고지의 효소탈묵 특성(제3보) -고지탈묵용 Bacterial Cellulase와 Xylanase의 생산-)

  • Park Seong-Cheol;Kang Jin-Ha;Lee Yang-Soo
    • 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.

Screening of Microorganisms Secreted High Efficient Enzymes and Properties of Enzymatic Deinking for Old Newsprint(IV) -Culture conditions of fungal extracellular enzyme production for biological deinking system- (고효율 효소를 분비하는 균주의 선발 및 신문고지의 효소탈묵 특성(제4보) -고지탈묵용 Fungal Cellulase와 Xylanase의 생산-)

  • Park Seong-Cheol;Kang Jin-Ha;Lee Yang-Soo
    • 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.38-46
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    • 2005
  • This study was focused on the optimum culture condition in CMCase, FPase and xylanase activities of two fungal strains that secret extracellular enzymes for using enzymatic deinking agent to old newsprint. The results of this study were as follows. When Fusarium pallidoroseum was grown on the medium, containing of rice bran+xylan $2.0\%,\;peptone\;0.6\%,\;KH_2PO_4\;0.075\%\;and\;MnSO_4\;0.06\%\;with\;pH\;9.0,\;at\;29^{\circ}C$ for 6 days, the quantitative degree of extracellular enzyme production was the highest. Optimum culture condition for Aspergillus niger was pH 5.0, $27^{\circ}C$ incubating temperature and 7 days incubation period on liquid medium, containing of CMC+xylan $2.5\%,\;yeast\;extract\;0.4\%,\;K_3PO_4\;0.05\%\;and\;CaCl_2+FeSO_4\;0.08\%$. Aspergillus niger was fairly higher FPase and xylanase activities than Trichoderma reesei ATCC 28217.

Comparison of Froth-flotation Efficiency between Fatty Acid and Non-ionic Surfactant Added to Recovered Paper with Increased Mixing Ratio of OMG (순환제지자원의 OMG비율 증가에 따른 지방산과 비이온성 계면활성제의 탈묵효율 비교)

  • Seo, Jin Ho;Lee, Kwang Seob;Lee, Tai Ju;Lee, Myoung Ku;Ryu, Jeong Yong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.47 no.4
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    • pp.88-95
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    • 2015
  • The main sources of recovered paper for newsprint are old newsprint (ONP) and old magazine (OMG). Recently, a lot of advertisement flyers are flowing into bales of ONP and portion of OMG is increasing in recovered paper because the consumption level of coated paper increases. In this study, nonionic surfactant and fatty acid were used as the de-inking agent for froth-flotation process of mixed recovered paper to investigate the effect of increased mixing ratio of OMG. De-inking efficiency of nonionic surfactant decreased as the mixing ratio of OMG increased; ink removal efficiency of froth-flotation is poor, however, the reject ratio increases due to ash from OMG. In comparison with nonionic surfactant, the ash from OMG had a little effect on reject ratio and optical properties of fatty acid applied flotation accept. If nonionic surfactant and fatty acid are added to pulper and flotation cell sequentially, excessive ash from OMG may not give an adverse effect on de-inking efficiency of mixed recovered paper.

Effects of Cloud Point of Non-ionic Surfactant on Deinking Efficiency of ONP at High Blending Ratio of OMG (비이온성 계면활성제의 운점이 OMG 배합비가 증가된 폐 신문지 탈묵효율에 미치는 영향)

  • Lee, Tai Ju;Seo, Jin Ho;Ryu, Jeong Yong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.47 no.6
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    • pp.164-169
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    • 2015
  • Nowadays blending ratio of OMG (old magazine) in recovered paper used for manufacturing newspaper have been increased. When large amount of OMG is consumed in newsprint mill, brightness can be improved by inorganic pigments of coating layer. On the other hand decrease in yield of deinking process will be encountered because the pigments can be removed as reject of froth flotation process. Therefore selection of the optimal deinking agent is an important. Non-ionic surfactant have been used widely in newsprint mill. Non-ionic surfactant has amphoteric characteristics. Hydrophilic group is ethylene and propylene oxide that can induce hydrogen bonding with water molecules. In this regard, cloud point is an important parameter in order to control efficiency of deinking process because hydration of the hydrophobic group can be varied according to temperature of a system. In this study, deinking properties of ONP at high blending ratio of OMG was analyzed according to cloud points of non-ionic surfactants. $L^*$, $a^*$, $b^*$, brightness and effective residual ink concentration did not affected by the change of cloud points. Especially, flotation reject decreased significantly according to increase in cloud point of the non-ionic surfactant. Consequently, when a nonionic surfactant having a cloud point higher than the temperature of the system is used, properties of the deinked pulp can be maintained and yield of deinking process can be improved.