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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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
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Volume & Issues
Volume 30, Issue 4 - Dec 1998
Volume 30, Issue 3 - Sep 1998
Volume 30, Issue 2 - Jun 1998
Volume 30, Issue 1 - Mar 1998
Selecting the target year
Deinking Difficulties Related to Waterbased Ink Printed Papers
Galland, Gerard ; Carre, Bruno ; Vernac, Yves ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 1~11
Evaluation and Application of Retention Aids for Papermaking System Closure
Lee, Hak-Lae ; Sung, Yong-Joo ; Youn, Hye-Jung ; Kim, Yong-Sik ; Oh, Jong-Ik ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 11~17
Reducing the effluent discharge from a paper mill is urgently needed due to tightening environmental regulations and economic reasons. For a paper mill to respond to system closure it is required to adopt the best practical retention system that enables the mill to improve fines retention and drainage. In this study, effects of various retention agents on fines retention, drainage and formation were examined using linerboard stock in the laboratory. Among the retention aids tested, high molecular weight cationic polyacrylamides showed good efficiency both in retention and drainage. On the other hand, high charge density, low molecular weight polymeric retention aids showed little improvement both in retention and drainage. The best retention system selected from the laboratory experiment was applied on a paper machine producing linerboard to evaluate its effect on papermaking system closure.
Evaluation and Application of Retention Aids for Papermaking System Closure
Lee, Hak Rae ; Seong, Yong Ju ; Yun, Hye Jeong ; Kim, Yong Sik ; O, Jong Ik ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 12~12
An Overview of Biopulping Research: Discovery and Engineering
Scott, Gary M. ; Akhtar, Masood ; Lentz, Michael J. ; Horn, Eric ; Swaney, Ross E. ; Kirk, T.Kent ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 18~27
Biopulping is defined as the treatment of wood chips with lignin-degrading fungi prior to pulping. Fungal pretreatment prior to mechanical pulping reduces electrical energy requirements during refining or increases mill throughput, improves paper strength, reduces the pitch content, and reduces the environmental impact of pulping. Our recent work involved scaling up the biopulping process towards the industrial level, investigating both the engineering and economic feasibility. We envision the process to be done in either a chip-pile or silo-based system for which several factors need to be considered: the degree of decontamination, a hospitable environment for the fungus, and the overall process economics. Currently, treatment of the chips with low-pressure steam is sufficient for decontamination and a simple, forced ventilation system maintains the proper temperature, humidity, and moisture conditions, thus promoting uniform growth of the fungus. The pilot-scale trial resulted in the successful treatment of 4 tons of wood chips (dry weight basis) with results comparable to those on a laboratory. Larger, 40-ton trials were also successful, with energy savings and paper properties comparable with the laboratory scale. The overall economics of the process also look very favorable and can result in significant annual savings to the mill. Although the current research has focused on biopulping for mechanical pulping, it is also beneficial for sulfite chemical pulping and some applications to recycled fiber have been investigated.
Effect of Polymerization Conditions on the Characteristics of Polyvinyl Acetate Emulsions
Youn, Hye-Jung ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 28~34
Polyvinyl acetate emulsion has been widely used as adhesives for wood and paper, paint additives and binders for fiber, leather, and other materials because it is an excellent adhesive with many advantages including low in toxicity risks and manufacturing cost. It is expected the consumption of polyvinyl acetate emulsion as adhesives will increase in cigarette industry as well as in paperboard coating industry. Recently the operation speed of the cigarette tip wrapper increased so substantially that improvement of the emulsion properties is required including good wet tack development, narrow and controlled particle size distribution, low viscosity, etc. In this study the effects of such polymerization conditions as the type and amount of emulsifier, internal or external plasticizing, and emulsification methods on the viscosity and particle size of polyvinyl acetate emulsions were examined. Results showed that polyvinyl alcohol with a high degree of hydrolysis and low molecular weight and nonionic surfactants are superior to anionic surfactant in improving adhesion and emulsion stability. They also tend to produce emulsions with smaller particle size. External plasticization with dipropylene glycol dibenzoate was more effective in improving flexibility than internal plasticization with butyl acrylate. Monomer emulsification under high shear was more effective in decreasing the particle size.
Effect of Filler Addition on Properties of Sheets Prepared from Bacterial Cellulose
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 35~41
The bacterial cellulose has many unique properties that are potentially and commercially beneficial. In order to make opaque product from this cellulose, filling properties by fillers should be known. This study was performed to investigate the effect of filler addition on physical properties of sheets from bacterial cellulose. The effect of filling on its optical properties was also discussed. The apparent density and internal bonding strength of bacterial cellulose sheet are decreasing with the increase of filler contents. Those adversely affect Young's modulus and physical property of the sheet, but these negative phenomena of the bacterial cellulose sheet by filler addition are not so sensitive compared to substantial decreasing of physical properties of ordinary hardwood KP. This strength decrease would be attributed to the decrease of relative bonding sites among pulp fibers. Concerned to optical properties, the bacterial cellulose sheet shows high increase of brightness and opacity according to filler loading, but no significant changes in porosity up to 17.3% loading because of fine and filamentous structure of bacterial cellulose fibers.
Effect of Bacterial Cellulose Addition on the Property of Chemithermomechanical Pulp Sheet
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 42~48
The bacterial cellulose(BC) has many unique properties that are potentially and commercially beneficial. In order to enhance inherently inferior physical property of chemithermomechanical pulp(CTMP) sheet, chemical pulp has been used widely. Bacterial cellulose also has an enhanced sheet strength because of its unique physical and morphological features. This study was carried out to inverstigate the effect of BC addition on physical properties of CTMP sheets. The effect of BC addition on its optical properties was also discussed. The apparent density, internal bond strength, Young's modulus, tensile strength and folding endurance of CTMP sheet are increasing with increase of BC contents. This strength increase would be attributed to the increase of relative bonding sites among pulp fibers by addition of BC which has microfibrillar structure with very high specific surface areas. There were not so significant changes in opacity of CTMP sheet upto 20% addition level of BC, while over 40% addition, the opacity gradually decreased and levelled off. Porosity is decreased with addition of BC. This decrease would be attributed to densification of sheet by fine and filamentous structure of BC fibers.
Study of Refining Effects on Pulp Fibre by Scanning Probe Microscopy(SPM)
;Keity Roy Wadhams;;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 49~58
The SPM could image the most detailed microstructure of a sample in a wet and dry state by measuring the interaction between the atoms on the sample surface and the extremely sharp probe tip. The refined fibre exhibited large wrinkles formed by fibrillar bundles, the disintegrated fibres extensively showed “scale-like features”. By using the Non-Contact Atomic Force Microscopy (NC-AFM) and Contact Atomic Force Microscopy (C-AFM) including Phase Detection Microscopy (PDM) and Force Modulation Microscopy (FMM), it was possible to investigate surface topography, surface roughness and mechanical property (hardness or visco-elasticity) of fibre surface in detail. The PDM and FMM images showed that the disintegrated only fibre displayed uniform mechanical properties, whereas the refined one did not. The surface roughness of pulp fibres was higher in refined fibres than in disintegrated fibres due to the presence of external fibrils. These SPM images would be used to provide visual evidence of morphological change of a single fibre created during mechanical treatments such as refining, drying, calendering and so on.
Effect of Chitosan Surface Treatment on the Antibacterial Properties of Paper
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 59~68
This study was to investigate the effect of chitosan molecular weight, its charge density, and its surface coating treatment on the antibacterial properties of paper. For this study, E.coil was used for antibacterial experiment. Results obtained were as follows : 1. The antibacterial properties of chitosan was significant on the surface-treated sheet. 2. Antibacterial property surface treatment was appeared to be effective when film was formed on the paper surface. 3. The antibacterial properties of chitosan-treated paper was dependent on the amount and the molecular weight of chitosan used. The lower the molecular weight of the chitosan down to 30,000 the better the antibacterial properties in this experiment. 4. Determination of the degree of chitosan-deacetylation by colloidal titration method was consistent with the more complicated and conventional FT-IR method.
Calendering Effects on the Properties of TiO
Highly Leaded Paper
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 69~78
Papers loaded with 10-40%
by dry weight were calendered under the various combinations of calendering conditions such as calender type, linear pressure, and roll temperature. After being calendered, light scattering coefficient, surface roughness, density, and tensile strength of the papers were measured and the results were summerized as follows: 1. To increase the light scattering coefficient of
-highly-loaded paper further by calendering, the calender roll pressure and temperature should be kept low. Under these conditions, the physical strength of the paper was not significantly affected. 2. At low roll temperature, soft nip calender and machine calender type showed the same relationship between paper density and its roughness. At high roll temperature, soft nip calender type gave much lower roughness than machine calender type at the same density. 3. At high roll temperature of both calenders, the density as well as the tensile strength of the TiO
-loaded paper was increased significantly.
Effect of Substrate Porosity on Double Coating Structure
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 79~84
The process of double coating consists of bottom coating using relatively coaser pigments to improve characteristics of base paper and top coating using finer pigments to cover unevenness of the bottom coating and to give various function of the coated paper. The structure of precoating is influenced not only by its components, but also characteristics of base paper, Moreover pore size and its size distribution of precoating are expected to influence the top coating properties, but this is not well understood. Coating and printing operations involve the application of pigmented fluid on top of a porous substrate. The porosity of the substrate has been shown to influence the properties of the coating, but a good understanding of the mechanisms is lacking in the literature. The role of pore size and void volume on top coating structure is unclear.
Studies on the Characteristics of Microorganisms Isolated fro]m Ancient Archives
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 30, issue 4, 1998, Pages 85~91
Habitative microorganisms were isolated from the floated air and surface of record materials of library with ancient archives. The major ecological fungi from them were isolated and identified as Aspergillus niger, Aspergillus oryzae, Neurospora sitophile, Mucor mucedo, Mucor rouxii, Penicilliun notatum, Rhizopus delema, Rhizopus nigricans, Thamnidium elegans, and Tricoderma viridae. When the cellulase activity of fungi isolated from ancient archives and documents was analyzed, Mucor rouxii and Penicilliun notatum showed the highest avicelase and filter paper activity, to 18.089 and 2.819 units, respectively, showing destructive ability of old archives and documents. Whereas, Mucor mucedo revealed the highest CMCase activity of exoglucanase to 7.044 units.