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펄프 종이기술 = Journal of Korea Technical Association o... 10건

  1. [국내논문]   Influence of Design of Turbulence Generator on Flow Behavior in Pilot Headbox  

    Youn Hye Jung (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University ) , Lee Hak Lae (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University ) , Chin Seong Min (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 1 - 10 , 2004 , 0253-3200 ,

    초록

    The geometry of headboxes is of great importance in obtaining good formation, even basis weight profile and fiber orientation. Therefore, many attentions have been made to examine the influence of the geometry of headboxes on the flow behavior. In this study, to evaluate flow behavior in headboxes, three types of turbulence generators were examined using pilot headbox. Velocity profiles in MD and CD were measured using a pressure monitoring system and flow in headboxes was visualized by dye injection method. CD velocity profiles at three different locations inside the slice of Type A headbox showed that the velocity increased downstream to slice exit and had a pattern with four humps due to the persisting wall effect of step diffusors. Results from the evaluation of normalized velocity profile and flow visualization showed that L-shaped Type C headbox caused a large pressure drop but it lacked in flow stabilizing ability.

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  2. [국내논문]   Model Algorithmic Control for Paper Mills Using Neural Networks  

    Park Jong Ho (Department of Chemical Engineering, Hanyang University ) , Yeo Yeong Koo (Department of Chemical Engineering, Hanyang University ) , Park See Han (Shinmoorim Paper Mfg. Co., Ltd. ) , Sohn Chang Man (Hansol Paper Co., Ltd.)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 11 - 20 , 2004 , 0253-3200 ,

    초록

    In this work the Model Algorithmic Control (MAC) method is applied to control the grade change operations in paper mills. The neural network model for the grade change operations is identified first and the impulse model is extracted from the neural network model. Results of simulations for MAC control of grade change operations are compared with plant operation data. The major contribution of the present work is the application of MAC in the industrial plants based on the identification of neural network models. We can confirm that the proposed MAC method exhibits faster responses and less oscillatory behavior compared to the plant operation data in the grade change operations.

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  3. [국내논문]   Characteristics of Pulp and Paper Produced from Corn Stalk   피인용횟수: 3

    Won, Jong Myoung ; Ahmed, Aziz
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 21 - 28 , 2004 , 0253-3200 ,

    초록

    Com stalk was evaluated to verify the potential as a raw material for papermaking. The lower lignin content and higher hemicelluloses content of cornstalk than any woods were considered to be beneficial for pulping and strength properties of paper. The average fiber length of com stalk was similar to those of hardwood, but longer fiber fraction is little bit included. It was found that the refining of pulp can be eliminated because of higher hemicelluloses content and narrower fiber characteristic. Disadvantages of cornstalk pulp were lower bulk and opacity, but it can be overcome by the proper use of wood pulp and filler.

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  4. [국내논문]   Fiber Dimensions and Chemical Properties of Various Nonwood Materials and Their Suitability for Paper Production  

    lahan M. Sarwar (Pulp and Paper Research Division, BCSIR Laboratories ) , Mun Sung Phil (College of Agriculture and Life sciences, Division of Forest Science, Chonbuk National University ) , Rashid Mamunur (Department of Botany, Jahanginnagar University)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 29 - 35 , 2004 , 0253-3200 ,

    초록

    Fiber dimensions, their derived values and chemical properties of cotton stalks (Gosypium hirsutum L), jute stick (Corchorus capsularis) and dhancha (Sesbania aculeate) have been examined to assess their suitability for paper production. Cotton stalks have a good derived values especially slender ratio, which is comparable to hardwood. The flexibility coefficient of these three non wood plants is better than hardwood. Anatomical analysis shows higher percentage of fibers and vessels than in general non wood plants. Lignin, $\alpha$ -cellulose and pentosan contents in these three nonwood plants are within the range of hardwood. Neutral sugar analysis of cotton stalks, jute stick and dhancha shows that the glucose in the major sugar followed by xylose and mannose. The arabinose and galactose are present in minor amount. Alkaline nitrobenzene oxidation of cotton stalks, jute stick and dhancha wood meal exhibits that these nonwood plant lignins mainly consist of syringyl (S) and guaiacyl (V) units. The S/V ratios are 1.6, 1.2 and 2.1 for cotton stalks, jute stick and dhancha, respectively.

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  5. [국내논문]   The Effect of Anti-UV Agents on UV Shielding and Photolytic Aging of Paper  

    Park Saung Bae (Department of Wood science and techonology, Kyungpook national University ) , Hyun Byung Doo (Woo Sung Chemicals Co. ) , Eom Tae Jin (Department of Wood science and techonology, Kyungpook national University)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 36 - 43 , 2004 , 0253-3200 ,

    초록

    The behaviors of deterioration in the mechanical and optical properties of paper during sunlight exposure are mainly attributed to UV irradiation. The effect of different additives (anti-UV agents) on paper properties during exposure was studied. The results showed negligible changes in the mechanical properties of samples prepared with two different ways, whereas the shielding ability was increased when the additives were applied to the surface of hand sheets. Also, the paper which is treated with anti UV agents can keep freshness more effectively of agricultural products from UV irradiation.

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  6. [국내논문]   The Quality Evaluation of Korean Traditional Hanji by Different Sheet-making Processes  

    Kim Hyoung Jin (Dept. of Forest Products, Kookmin University ) , Jo Byoung Muk (Dept. of Paper Sci., & Eng., Kangwon Nat'l University ) , Lee Yong Moo (Korean Agency for Technology and Standards)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 44 - 52 , 2004 , 0253-3200 ,

    초록

    It is well known that Korean traditional Hanji have lots of predominant physical and optical properties such as high density, high air permeability, long lasting quality and lightness. The paper-making raw materials of traditional Korean Hanji are the bast fibre cooked from the Korean paper mulberry as a fibrous materials and sticky aqueous material from the root of Hibiscus anihot L. as additives for good dispersion of stock. Additionally, the mechanical properties of Hanji varies according to the cooking methods of bast tissues of Korean paper mulberry, the treatment methods of fibrous raw materials such as bleaching and refining, the wet formation types of sheet-making such as 'Oebal-chiji' and 'Ssangbal-choji', and the finishing treatment like stamping. This study was carried out to investigate and evaluate the quality properties of Korean traditional hand-made Hanji, and compared with commercial machine-made paper and modified prepared sheets. The physical quality comparisons of different kinds of Hanji were focused on the methods of hand-sheet making, the types of raw materials, the treatment of stamping, and the properties of ink reception and spreading.

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  7. [국내논문]   Properties and Biodegradability of Polylactide for Paper Coating Application - $Poly(_{L} -lactide)\;and\;Poly(_{D}-lactide)$ Blend -  

    Lim Hyun A (Institute of Agricultural Science & Technology, Chonbuk National University ) , Kang Jin Ha (Division of Forest Science, College of Agriculture and Life Sciences, Chonbuk National Univeristy)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 53 - 61 , 2004 , 0253-3200 ,

    초록

    [ $Poly(_{D}-ldactide)\;(_{D}-PLA)$ ] was synthesized to have low molecular weight for miscible blends with a high molecular $poly(_{L}-lactide)\;(_{L} -PLA)$ . The blends were prepared by dissolving the two components of $_{L}-PLA\;and\;_{D}-PLA\;(w/w)$ in chloroform (l00/0, 90/10, 70/30, 50/50, 30/70, 0/100). The miscibility of these miscible blends was characterized by gel-permeation chromatography (GPC), differential scanning calorimetry (DSC), and the selective degradability by enzymes (proteinase K, subtilisin and $\alpha$ -chymotrypsin). The coating efficiency of PLA blends onto paper was determined and the degrading activity cellulases by on these blends. The miscibility, coating efficiency and enzymatic degradability of these blends were decreased according to increasing of $_{D}-PLA$ blending part. Such results were attributed to the extent of coating application of PLA, with better miscibility (compatibility), coating efficiency and degradability due to a higher $_{L}-PLA$ content.

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  8. [국내논문]   Impact of Residual Extractives and Hexenuronic Acid on Lignin Determination of Kraft pulps  

    Shin Soo Jeong (Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF) ) , Schroeder Leland R (Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF) ) , Lai Yuan Zong (Faculty of Paper Science and Engineering, State University of New York, College of Environmental Science and Forestry (SUNY-ESF))
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 62 - 68 , 2004 , 0253-3200 ,

    초록

    The amount of non-lignin components in unbleached and oxygen-delignified kraft pulps and their impact on lignin determinations was investigated. The lignin analyses investigated were kappa number and Klason lignin in conjunction with acid-soluble lignin. The species investigated were loblolly pine, and aspen. The non-lignin components that impacted on lignin determination were residual extractives and hexenuronic acid in unbleached and oxygen-delignified kraft pulps. In the hardwoods, significant amounts of extractives remained after kraft pulping and oxygen delignification. These residual extractives in the hardwood pulps had an impact on the lignin determination, more so on the acid lignin method than kappa number. Hexenuronic acid only impacts on kappa number determination both softwood and hardwood pulps, not on acid lignin. Hexeneuronic acid contributed as lignin content more in aspen than pine pulps, and more in oxygen-delignified than unbleached kraft pulps. Impact of hexenuronic acid on should be corrected both softwood and hardwood pulps for accurate kappa number.

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  9. [국내논문]   The Degradation of Wood and Pulp by Wood-degrading Fungi  

    Jung Hyunchae (College of Agriculture and Life Science, Sunchon National University ) , Geng Xinglian (Department of Wood Science and Engineering, Oregon State University ) , Li Kai Chang (Department of Wood Science and Engineering, Oregon State University)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 69 - 77 , 2004 , 0253-3200 ,

    초록

    Degradations of pine, yellow poplar and sweet gum by two fungi, Pycnoporus cinnabarinus and Trichophyton rubrum LSK-27 were investigated. P. cinabarinus degraded pine block samples much faster than T rub rum LSK-27, whereas P. cinnabarinus and T rubrum LSK-27 degraded yellow poplar and sweet gum at almost the same rate. In an effort to get a better understanding of how fungi degrade lignin in wood, contents of various functional groups were analyzed. After three-months of degradation of pine flour by these fungi, the following changes were observed: an increase in condensed phenolic OH group and carboxylic acid group content, a decrease in the guaiacyl phenolic OH content, and little change of aliphatic OH group content. Further studies in the degradation of pine flour by P. cinnabarinus indicated that the increase in condensed phenolic OH group content and the decrease in guaiacyl phenolic OH group content occurred in the first month of the degradation. The changes of functional group contents in the degradation of unbleached softwood kraft pulp by P. cinnabarinus had the same trends as those in the degradation of pine flour. That is, structural alteration of lignin due to the kraft pulping process had little effect on how P. cinnabarinus degraded lignin.

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  10. [국내논문]   Preparation of Cation-exchange Resin from Lignin  

    Kamelt S. (Cellulose & paper department National Research Center)
    펄프 종이기술 = Journal of Korea Technical Association of the Pulp and Paper Industry v.36 no.5 = no.108 ,pp. 78 - 84 , 2004 , 0253-3200 ,

    초록

    Lignin precipitated from black liquor of soda pulping of bagasse was used to prepare cation-exchange resin. The effect of sulfuric acid treatment, concentration of phenol and formaldehyde on the properties of the prepared cation-exchange resin was investigated. It was found that sulfonated resinified phenolated lignin gave a resin with an ion-exchange capacity higher than that of resin, which resulted from sulfonation of resinified lignin at zero phenol concentration. Infrared spectroscopy of the prepared ion-exchange resin shows anew bands at 1060, 1160, 1280 and $1330\;cm^{-1}$ which indicated to the presence of $SO_{3}$ .

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