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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
Editor in Chief :
Volume & Issues
Volume 44, Issue 6 - Dec 2012
Volume 44, Issue 5 - Oct 2012
Volume 44, Issue 4 - Aug 2012
Volume 44, Issue 3 - Jun 2012
Volume 44, Issue 2 - Apr 2012
Volume 44, Issue 1 - Feb 2012
Selecting the target year
Application of spacers for increasing OCC solid content in wet pressing process (I)
Hwang, In-Young ; Lee, Young-Ho ; Jung, Jae-Gwon ; Sung, Yong-Joo ; Seo, Yung-Bum ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 1~7
DOI : 10.7584/ktappi.2012.44.4.001
The increase of OCC solid content after wet pressing will save drying energy greatly. We applied spacers, which used to increase draining rate and bulk in fiber furnishes, to increase the OCC solid contents. MDF fibers (fibers for making medium density fiberboard) and diatomaceous earth were used as spacers, and added 10% by weight to the OCC fiber furnish. Application of high wet pressing pressure to the mixed furnish of spacers and refined OCC did not deteriorate bulk and drainage rate, but their solid contents were increased to 0.5-1.5% without loss of compressive strength when compared to those of unrefined OCC, which is the furnish normally used for mill commercial practice. It is believed that the spacers caused the rate of solid content increase faster in the mixed furnish with OCC at high wet pressing pressure area than the unrefined OCC furnish did. Little amount of starch addition (0.5%) to the spacers helped to keep the strength properties.
Application of in-situ CaCO
forming process on recycled fibers for optical property improvement
Park, Dong-Hui ; Lee, Min-Woo ; Lee, Jong-Kyu ; Ahn, Ji-Whan ; Seo, Yung-Bum ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 8~15
DOI : 10.7584/ktappi.2012.44.4.008
Optical property improvements for ONP (old newspaper) and OMG (old magazine) were attempted by application of in-situ
formation process on recycled fiber surfaces. Washing treatment of ONP and OMG resulted in 35~40% yield loss for around 6% brightness improvement. Washing plus bleaching process with
and FAS (formamidine sulfinic acid) improved brightness and ERIC values a little more with the same amount of yield loss as washing treatment. In-situ
formation method improved those optical properties much better than the washing plus bleaching method without loss of yield, and better than the case of adding high brightness PCC up to the same ash level. It can be said that the in-situ
formation method may be used as an effective alternative for upgrading optical properties of recycled fibers.
Preparation of Cross-sectional Specimen for High Resolution Observation of Coating Structure and Visualization of Styrene/butadiene Latex Binder
Kim, Chae-Hoon ; Youn, Hye-Jung ; Lee, Hak-Lae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 16~24
DOI : 10.7584/ktappi.2012.44.4.016
To characterize the coating structure, diverse methods such as mercury intrusion, nitrogen adsorption and oil absorption methods have been developed and widely employed. These indirect techniques, however, have some limitation to explain the actual coating structure. Recently microscopic observation methods have been tried for analyzing structural characteristics of coating layers. Preparation of the undamaged cross section of a coating layer is essential for obtaining high quality image for analysis. In this study, distortion-free cross-section of the coating layer was prepared using a grinding and polishing technique. The coated paper was embedded in epoxy resin and cured. After curing the resin block it was ground with abrasive papers and then polished with diamond particle suspension and nylon cloth. Polished coating layer was sufficient enough to obtain undamaged cross sectional images with scanning electron microscope under backscattered electron image mode. In addition, the SEM images allowed distinction of the coating layer components. Also S/B latex film formed between pigment particles was visualized by osmium tetroxide staining. Pore size distribution and pore orientation were evaluated by image analysis from SEM cross-sectional images.
Application of PEO/Cofactor System on Papermaking Process for Recycled Fibers
Jung, Chul-Hun ; Lee, Jin-Ho ; Kil, Jung-Ha ; Park, Jong-Moon ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 25~31
DOI : 10.7584/ktappi.2012.44.4.025
Ionic trash in furnish decreases retention and drainage performance of the microparticle retention system using recycled fibers in closed papermaking system. Two retention systems, such as the microparticle system and the PEO/cofactor system, were compared and analyzed to improve retention. The PEO/cofactor system achieved similar retention performance at low addition level as the microparticle system. Optimum ratio of PEO/cofactor dual polymer system was 1:10. Ash retention was increased when using the fixing agent. As the TMP ratio increased, the PEO/cofactor system was more efficient in retention and drainage than the other system. The high molecular weight and non-ionic polymer retention system had less effect on flocculation hindrance than the traditional electrostatic retention system.
Analysis on the Trend of the Utilization of Woody Biomass - Production, supply, and practical use of woody biomass -
Ahn, Byeong-Il ; Kim, Chul-Hwan ; Lee, Ji-Young ; Shim, Sung-Woong ; Jo, Hu-Seung ; Lee, Gyeong-Sun ; Lee, Jee-Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 32~42
DOI : 10.7584/ktappi.2012.44.4.032
Wood biomass including forest residues, waste wood, and construction residuals has been widely generated in Korea, but forest biomass from the National Forest Management Operation Project plays a big role in generating wood biomass. Unfortunately the promotion policy of woody energy organized by the Forest Service in Korea concentrates more on demand creation rather than on supply expansion. Therefore, in order to utilize insufficient wood resources effectively, it is greatly required to develop uses for maximizing their added value. In particular, more attention to the use of the second generation biomass has been paid in foreign countries because there is a threshold that the first generation biomass cannot produce enough biofuel without threatening food supplies and biodiversity. In Korea, wood pellets are regarded as the alternative clean fuels to oils and coals that emit green house gases into the atmosphere. However, using wood as pellet raw materials can not be an economic way because the value of wood disappears right after burning in the boiler in spite of its contribution to the decrease of carbon emission. Differently from wood pellets, kraft pulping process using woody biomass produces black liquor as a by-product which can be used to generate electricity, bioenergy and biochemicals through gasification. Thus, it can be more economical to make a torrefaction of lignocellulosic biomass such as low-quality wood and agricultural leftovers as raw materials of pellets.
Determination of crystallinity index of cellulose depending on sample preparation and analysis instruments
Ahn, Jung-Eon ; Youn, Hye-Jung ; Joung, Yang-Jin ; Kim, Tae-Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 43~50
DOI : 10.7584/ktappi.2012.44.4.043
The crystallinity index is an important characteristic of cellulose. The crystallinity value is different depending on the adopted instrument. In this study, we determined a crystallinity index of cotton and wood celluloses using wide-angle X-ray scattering (WAXS), powder X-ray diffractometer (PXRD), and cross polarization/magic angle spinning solid-state
nuclear magnetic resonance spectroscopy (CP/MAS solid-state
NMR). The specimen was prepared in forms of powder, sheet and pallet. With the comparison of the obtained crystallinity indices of the cellulose, the effects of the analysis instrument, the sample preparation and analysis method were investigated. Among three instruments, the crystallinity indices by PXRD and NMR had a good relationship and reproducibility, and WAXS gave the crystallinity index with poor reproducibility. In the case of analysis methods of crystallinity indices, the Segal method showed higher value than that of the Ruland-Vonk method. We expect that this study would be applicable to evaluate the crystallinity index of various cellulose materials with accuracy and reproducibility.
Effects of Electron Beam Treatment on the Characteristics of Pulping and Papermaking of Hemp Bast Fibers
Bae, Paek-Hyun ; Seo, Jae-Hwan ; Jung, Jin-Ho ; Lee, Jae-Jung ; Paik, Ki-Hyun ; Kim, Hyoung-Jin ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 51~61
DOI : 10.7584/ktappi.2012.44.4.051
The new alkali pulping process combined with electron beam treatment was applied to utilize hemp bast tissues as a new valuable fibrous resource. Hemp bast tissues have some chemical properties with high lignin contents and holocellulose not to be defiberized by alkali pulping only, compared with the bast tissue of paper mulberry. To make up for the weakness of traditional alkali pulping process, electron beams were directly irradiated into the swelled bast tissue of hemp in NaOH solution and distilled water, and then facilitated the defiberization of hemp bast tissues. The papermaking from hemp bast fibers manufactured by the combination pulping process showed good apparent density, formation structure and air permeability, and had some mechanical properties with lower tensile, tear, burst strength and folding endurance. It is finally concluded that the combination pulping process with electron beam treatment could be suggested a new alternative for non-woody fibers.
Effects of PCC Loading at Thick Stock on the Paper Properties
Won, Jong-Myoung ; Cho, Byoung-Uk ; Lee, Yong-Kyu ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 62~68
DOI : 10.7584/ktappi.2012.44.4.062
This study was carried out to evaluate the effect of PCC loading at thick stock on the physical properties of paper. The effect of starch addition(2, 4 and 6%) and mixing time(5, 10 and 20 min.) on the filler retention and paper properties were investigated. Optimum dosage of cationic starch as a fixing agent was 4%, and mixing time did not showed any significant effect on the filler retention. PCC loading at thick stock was more effective to improve bulk and opacity than PCC loading at thin stock, although their improvement was not so significant. It was also found that the strength properties could be improved by the loading at thick stock. PCC loading method at thick stock could be considered as one of potential approaches for further improving of paper properties, although further research works are required in order to apply the PCC loading at thick stock in the paper mill.
A Study on the Utilization of Ingredients and Fibers from Korean Bamboo Species in Value-added Industry: Part 2. Preparation and Characterization of Bamboo Fibers
Kang, Kyu-Young ; Yoon, Seung-Lak ; Jeon, Kwon-Seok ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 69~76
DOI : 10.7584/ktappi.2012.44.4.069
The bamboo fibers from three Korean bamboo species, Moso, Henon and Timber bamboo, were prepared by disintegration after thermal treatment. The samples were prepared according to the age of growth; bamboo shoots, 20 days and 50 days of growth. The fiber quality was also investigated by morphological and chemical analyses. There was no big difference in the dry mass of fibers among the three bamboo species. However, the dry mass of fibers from 50 days of growth was increased by 34%, whereas it was ranged in 9-20% in the case of fibers from bamboo shoots and 20 days of growth. In the results of morphological analysis, the fibers could be classified as the fibers from metaxylem, the fibers from parenchyma and the fines produced during disintegration. The fibers from 50 days of growth were separated from metaxylem, whereas the fibers from bamboo shoots and 20 days of growth were mainly consisted of fibers from metaxylem and parenchyma. The chemical analysis of fibers showed that the contents of carbohydrates, lignin and extractives were not much affected by thermal treatment.
The Study of the Printability on the Phenol Free Heat-Set Web Inks(III) - Effects of the Emulsification of Ink on Print Quality -
Ha, Young-Baeck ; Oh, Sung-Sang ; Lee, Won-Jae ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 77~84
DOI : 10.7584/ktappi.2012.44.4.077
The lithographic process depends on a satisfactory ink-in-water emulsion being formed during printing and the speed of wet presses makes the choice of fountain solution vitally important as the ink and fount must react quickly to form a stable emulsion. Ink and water come into contact with each other on the rolls of the press and are forced together in the roll nips. The water is not soluble in the ink since it is slightly fat. Instead, an emulsion is formed, a heterogeneous mass consisting of small water drops mixed into the ink, if the water feed is too great. This emulsification can affect the properties of an off-set ink and negatively affect the printability. So we investigated the effects of the emulsification of phenol free heat-set ink and existing heat-set ink on printed quality, such as amount of ink transfer, printed density, print-through and uniformity. We used Duke emulsification tester for the emulsification of inks, and used IGT printability tester for printed quality. The printed quality were measured by densitometer and were evaluated by the image analysis system. Compared to conventional printing ink, phenol-free ink showed better results of the printability at the emulsification.
Evaluation of Wet Pressing Response of Recycled OCC with Roll Press Simulator
Sung, Yong-Joo ; Jeong, Wong-Ki ; Kim, Dong-Seop ; Oh, Min-Taek ; Hong, Hae-Un ; Seo, Yong-Bum ; Im, Chang-Kuk ; Gwon, Wan-Oh ; Kim, Jin-Doo ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 85~90
DOI : 10.7584/ktappi.2012.44.4.085
Wet pressing process has great influence not only on the paper properties but also on the efficiency of total manufacturing process including energy efficiency. The slow drainage propensity of old corrugated container(OCC) might require more complicated control of wet pressing process. In this study, the change in press efficiency and in structure of wet sheet by the various condition of laboratory roll press simulator were evaluated to provide background information about wet pressing of OCC. The higher pressure and the slower machine speed resulted in higher efficiency of wet pressing but the change trends of dryness depending on the wet press pressure and machine speed were shown differently according to OCC treatment. The effects of water contents of felt on the wet press efficiency and sheet structure were also investigated. The higher contents of water in felt resulted in less removal of water generally and the crushed structure of wet sheet were appeared especially at higher pressure.
Effect of Ultra Fine Precipitated Calcium Carbonate on the Quality of Coated Paper
Kim, Sun-Kyung ; Won, Jong-Myoung ; Lee, Yong-Kyu ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 91~98
DOI : 10.7584/ktappi.2012.44.4.091
This study was carried out in order to evaluate the effects of ultra fine precipitated calcium carbonate (UFPCC) on properties of coating color, coated paper and off-set printability. It was found that blending of UFPCC increased the low-shear viscosity and water retention of coating color. The smaller the particle size, the more significant the effect of it. When the blending ratio of UFPCC was increased, brightness, whiteness and opacity of the coated paper were improved, while paper gloss was decreased due to the increase in roughness. When the UFPCC with the average particle size of
was used, the ink receptivity during off-set printing was improved while print gloss was maintained or a little decreased. It was also observed that the dry-pick and wet-pick strength of coated paper were improved by the use of UFPCC. In conclusion, it is possible to produce the low gloss matt paper with the use of UFPCC since it could improve the optical properties and ink receptivity of coated paper.
Evaluation of Lumen-loaded Fiber with Micro Metal Particles
Sung, Yong-Joo ; Jung, Woong-Ki ; Lee, Ji-Young ;
Journal of Korea Technical Association of The Pulp and Paper Industry, volume 44, issue 4, 2012, Pages 99~107
DOI : 10.7584/ktappi.2012.44.4.099
In this study, the lumen loading technology for preparing magnetic papers were evaluated. The rice husk fiber, softwood kraft pulp, hardwood kraft pulp were applied and the morphological properties of pits on the those fibers were investigated with SEM. The softwood kraft pulp had the bigger size of pits,
in diameter, which resulted in higher loading amount. The comparison of two methods for lumen loading such as the low concentration method with the disintegrator and the high concentration method with the Hobart mixer showed the Hobart mixer could resulted in the higher efficiency. The conditions of lumen loading process such loading time, addition amount of metal particles and addition of PEI were also evaluated. The magnetic hysteresis loop of handsheet samples made of lumen loaded fiber with
were examined. The differences in magnetic properties could be found according to the ferrite types.