Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korea Technical Association of The Pulp and Paper Industry
Journal Basic Information
Journal DOI :
Korea Technical Association of the Pulp and Paper Industry
Editor in Chief :
Volume & Issues
Volume 35, Issue 5 - Dec 2003
Volume 35, Issue 4 - Dec 2003
Volume 35, Issue 3 - Sep 2003
Volume 35, Issue 2 - Jun 2003
Volume 35, Issue 1 - Mar 2003
Selecting the target year
Influence of Crosslinked Cationic Starches and Silica Microgels on the Performance of Microparticle Retention System
Kim, Tae-Young ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 1~9
Effectiveness of the microparticle retention systems in improving drainage, retention, formation has been recognized for many years. In this study the effectiveness of crosslinked cationic corn starches and silica-based microgels as components of Compozil system has been evaluated. It was shown that improvements in retention and strength could be achieved by employing crosslinked cationic corn starches especially at high conductivity. Silica-based microgels with better performance in retention and drainage than a commercial colloidal silica sol have been made through a reaction of sulfuric acid and sodium silicate solutions.
Neutral Deinking of Old Newsprints Contaminated with Flexo Ink
Hoon Ryu ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 10~16
Presence of small amount of old newspapers printed with waterbased flexographic inks leads to a significant loss of brightness of the deinked pulp by flotation process. Recently there has been an increased interests in employing neutral deinking processes to solve the problems associated with waterbased flexo ink. A comparative experimental study was performed to evaluate the efficiency of neutral deinking and conventional alkaline deinking for ONP furnishes contaminated with flexo ink. Effects of the deinking processes on pulp quality and white water characteristics were examined. It was shown that neutral deinking would provide significant improvement in brightness, yield, and freeness as compared with conventional alkaline deinking. There was no increase in brightness when OMG was added in the furnish up to 20 ％, and it was attributed to the redeposition of flexo inks on chemical pulp fibers.
Characterization of Base Paper Properties on Coating Penetration
Kim, Bong-Yang ; Douglas W. Bousfield ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 17~25
The influence of base paper properties and fiber type on coating penetration was studied in terms of characterization of coating holdout using two types of hand sheets as the base paper which were prepared from thermomechanical pulp (TMP) and hardwood bleached kraft pulp(KP) sized internally with alkyl ketene dimmer (AKD). Laboratory rod draw down coater was used for surface sizing and coating application. Characterization of coating penetration was done by measuring the roughness of the backside of coating layer. The backside of the coating was exposed by dissolving the fibers in a solution of cupriethylenedimine (CEO). Data show that internal sizing of base paper is effective and surface sizing is more effective to prevent coating penetration. Comparing between the two types of base papers, backside roughness of coating layer of TMP sheet is much larger and sizing is more effective to reduce coating penetration than those of KP sheet. From the result of water absorption and sizing degree after surface sizing, it seems that internal sizing slows down molecular diffusion much more than capillary penetration, but surface sizing reduces the capillary penetration. Furthermore, predominant mechanism of water into paper of TMP sheet seems to be capillary penetration, but it is molecular diffusion in the case of KP sheet.
Analysis of the Wet-end Dynamics in Paper Mills
Ryu, Jae-Yong ; Yeo, Yeong-Koo ; Yi, Sung-Chul ; Seo, Dong-Jun ; Hong Kang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 26~36
The wet-end dynamics of a paper mill was analyzed to characterize its dynamic behavior during the grade change of paper. The model representing the wet-end section is developed based on the mass balance relationships written for the simplified wet-end white water network. From the linearization of dynamic model, higher-order Laplace transfer functions were obtained followed by the reduction procedure to give simple lower-order models in the form of 1
-order or 2
-order plus dead times. The dynamic response of the wet-end is influenced both by the white water volume and by the level of wire retention. Effects of key manipulated variables such as the thick stock flow rate, the ash flow rate and the retention aid flow rate on the major controlled variables were analyzed by numerical simulations. The simple dynamic model developed in the present study can be effectively used in the operation and control of paper mills.s.
Construction of a Pilot Headbox System and Pressure Monitoring Apparatus for the Development of High Speed Hydraulic Headboxes
Youn, Hye-Jung ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 37~45
To investigate the influence of the design and operating parameters of the headbox on hydrodynamics, a pilot headbox system and pressure monitoring apparatus were constructed. The pilot headbox system consisted of a circulating water reservoir, centrifugal pump, distributor, turbulence generator and slice. The distributor was designed to function as a pressure attenuator. Flow rate to the headbox and MD and CD velocity profiles in the slice zone were monitored using an ultrasonic flowmeter and Pitot tubes, respectively. As the distance from the step diffusor increased, evener CD velocity profile was observed. Wall effect increased with the increase of the velocity. Flow stability in the headbox was evaluated by injecting a dye at the outlet of the distributor. Application of theoretical analysis based on CFD in designing headboxes is briefly discussed.
Modeling of Grade Change Operations in Paper Mills
Ko, Jun-Seok ; Yeo, Yeong-Koo ; Ha, Seong-Mun ; Lim, Jung-Woo ; Ko, Du-Seok ; Hong Kang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 46~52
In this work we developed the closed-loop model of a paper machine during grade change with the intention to provide a reliable dynamic model to be used in the model-based grade change control scheme. During the grade change, chemical and physical characteristics of paper process change with time. It is very difficult to represent these characteristics on-line by using physical process models. In this work, the wet circulation part and the drying section were considered as a single process and closed-loop identification technique was used to develop the grade change model. Comparison of the results of numerical simulations with mill operation data demonstrates the effectiveness of the model identified.
Modeling of the Drying Process in Paper Plants
Hwang, Ki-Seok ; Yeo, Yeong-Koo ; Yi, Sung-Chul ; Dongjun Seo ; Hong Kang ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 53~61
In this study a model for the drying process in paper production plants was developed based on the mass and heat balances around drying cycles. Relationships for the heat transfer coefficients between the web and the air as well as between the drying cylinder and the web were extracted from the closed-loop plant operation data. It was found that the heat transfer coefficients could be represented effectively in terms of moisture content, basis weight and reel velocity. The effectiveness of the proposed model was illustrated through numerical simulations. From the comparison with the operation data, the proposed model represents the paper plant being considered with sufficient accuracy.
Bio-Soda Pulping of Rice Straw with Pleurotus cornucopiae under Atmospheric Pressure
Ju, Yong-Chan ; Kang, Jin-Ha ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 62~71
This study was carried out to develop the bio-chemical pulping method to enhance the energy saving and decrease the capital cost through the soda pulping under atmospheric pressure (
). Nonwood substrates, rice straw, were pretreated by white-rot fungi, Pleurotus cornucopiae. Several basic pieces of data that can be applied in soda pulping were acquired. The results of this study were as follows. Under the conditions without any nutrients or with glucose, N and glucose + N, the weight losses of rice straws inoculated by Pleurotus cornucopiae were 12.1∼32.6 %, 12.0∼26.3 %, 13.0∼25.4 % and 15.3∼24.7 % for 5, 10, 15, 20, 25 and 30 days incubation periods respectively. The more the fungal incubation was extended, the more the weight losses were gained. The yield of untreated rice straw was 54.8 % after pulping. When any nutrients was not added or glucose, N and glucose ＋ N were added for the pretreatment, the total yields were ranged to 57.3∼42.9 %, 51.0∼43.3 %, 51.7∼43.9 % and 52.1∼46.1 % for 5 different incubation periods respectively. The yields were gradually decreased based on the extending of the incubation periods. The physical properties of the rice straw soda pulp without fungal treatment, the density, breaking length, burst index, tear index and folding endurance were 0.24g/㎤, 2.32 Km, 0.91 kPaㆍ
/g, 46.7 mNㆍ
/g and 21 times, respectively. In the case of pretreatment without any nutrients or with glucose, N and glucose + N as nutrients, the density was 0.24g/㎤, the breaking length was 3.30∼6.46 Km, the burst index was 1.36∼3.01 kPaㆍ
/g, the tear index was 33.0∼57.0 mNㆍ
/g and the folding endurance was 14∼381 times at most incubating periods, when pulping was done. The physical properties were increased as the incubation duration was extended. Especially, when N and glucose ＋ N were added, the physical properties showed superior results during each incubation period.
Characterization of Nalita Wood (Trema orientalis) as a Source of Fiber for Papermaking (Part I): Anatomical, morphological and chemical properties
M. Sarwar Jahan ; Mun, Sung-Phil ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 72~79
Nalita wood (Trema orientalis), one of the fastest growing woods in the world, is characterized anatomical, morphological and chemical properties at annual growth ring level in order to investigate as papermaking raw material. The proportion of fibers and vessel was increased with an increase of growth ring (from pith to bark). The fiber length of Nalita was increased with increasing growth ring, and an average fiber length was about 817 um. The average basic density of Nalita was about 0.38 g/cc. The total lignin & holocellulose in Nalita were increased and ash & alcohol-benzene extract decreased from pith to bark. These values were about 23.5 - 24.4 ％, 78.1 - 80.1 ％, 1.04 - 0.92 ％ and 2.1 - 1.8 ％, respectively. The xylan was the predominant sugar in the hemicellulose of Nalita.
Production of Laccase and Bioremediation of Pentachlorophenol by Wood-Degrading Fungus Trichophyton sp. LKY-7 immobilized in Ca-Alginate Beads
Hyunchae Jung ; Kyuhwan Hyun ; Park, Chongyawl ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 35, issue 5, 2003, Pages 80~86
The wood-degrading fungus Trichophyton sp. LKY-7 (T. LKY-7) was immobilized in ca-alginate beads for laccase production and PCP bioremediation. The immobilized T. LKY-7 enabled the repeated use of this fungus for laccase production and produced high amount of laccase throughout 5 cycles incubation. As a laccase inducer. oak wood meal (Quercus variabilis) seemed to be effective laccase inducer for T. LKY-7, and the optimum addition amount was 1％ (W/W) in glucose-peptone medium. Bioremediation of pentachlorophenol by the immobilized T. LKY-7 reached an efficency of up to 90％ without toxic inhibition. The immobilized T. LKY-7 might thus be applicable for semicontinuous laccase production and bioremediation to serve inoculum for reactor system.