• 펄프종이기술
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• 제35권4호
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• pp.17-22
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• 2003

A kind of image analysis system is used to investigate the structural features of the papers made from Indian mallow. The screen mark on the paper was identified and analyzed. The dusts, shives and fiber bundles were manifested and calculated. In the aspect of Indian mallow hanji's surface characteristics analyzed by an Image analyzer, the average of gray level and its standard deviation hanji from the woody core were rather lower than of bast fiber pulp because of better sheet formation of the formers. Hower. high brightness hanji showed high value of gray level. The sheet formation and paper opacity were increased with the decrease of standard deviation of gray level. From these results, gray level measurement could be used to predict the paper opacity as well as sheet formation.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2011년도 추계학술발표회 논문집
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• pp.413-420
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• 2011

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.273-276
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• 2007

A natural graphite heat spreader increased the upper operating temperature limit of a CCFL backlit LCD television. A 0-80W heat source was used to simulate additional electronics. Without the heat spreader, internal circuitry shut-down at ${\sim}30;$ no shut-down occurred above 80W with a heat spreader. Additionally, brightness, temperature uniformity, and operating ranges were improved, verified by environmental chamber performance testing at various ambient conditions.

• 펄프종이기술
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• 제47권1호
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• pp.35-44
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• 2015

Thermomechanical pulping process uses large amounts of energy, mostly electricity to run electrical facilities. Thermomechanical pulp (TMP) made from Pinus densiflora also has a big drawback that refining consumes 90 per cent of the total energy used in TMP process. This study explored to draw up a way to save refining energy through different thermal treatment at the stages of presteaming and refining. Presteaming temperature was $80^{\circ}C$, $100^{\circ}C$, and $120^{\circ}C$. After presteaming at each temperature, refining was carried out at $100^{\circ}C$, $120^{\circ}C$, and $140^{\circ}C$ respectively. In a presteaming stage, steaming temperature over $120^{\circ}C$ greatly contributed to the decrease of refining energy leading to earlier attainment of a target freeness, irrespective of refining temperature. In addition, NaOH treatment with presteaming enhanced better development of fiber properties during refining than presteaming without NaOH. High temperature refining at $140^{\circ}C$ produced a high strength paper, and wood chips treated by alkali responded better to refining than at over $120^{\circ}C$. Improved softening effect on wood chips led to the decrease in shives contents but it gave no effect on pitch contents of TMP.

• 펄프종이기술
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• 제34권4호
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• pp.44-50
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• 2002

This research was performed to investigate the physical properties and color appearance of Hanji manufactured using bast fibers dyed separately by two reactive dyes with different colors. The breaking length of color Ha was above 7 km. The fastness was five grade; the use of reactive dyes made the color of the Hanji not to be faded away. The Hanji manufactured by mixing uniformly two types of bast fibers separately dyed showed the mixed color of two different colors. However, the shives showed their original colors, resulted in irregular color patterns all over the sheets. The color of color Hanji with different colors in the front and back side of sheets showed color difference between front and back side of the sheets. Accordingly, the color of the sheet has a reflection from the backside, resulted in Pink. The colors of the Hanji appeared in this study could not be found from the Hanji manufactured by traditional methods.

• 펄프종이기술
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• 제42권1호
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• pp.20-25
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• 2010

Fractionation effects of the slot-type and the hole-type screens of mutifractors were studied using a pilot multifractor. We used a slot screen of 0.15 mm, and two hole screens of 1.0 and 2.0 mm, respectively, in the study. We found hole-type screens were more effective for fractionation of fiber furnishes according to their fiber lengths. Slot-type screen was more effective to remove the shives from the accepted fiber furnishes. There existed a high regression coefficient between the fiber length differences and the freeness differences of the accepted and the rejected fiber furnishes.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 Pre-symposium of the 10th ISWPC Recent Advances in Paper Science and Technology
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• pp.315-319
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• 1999

A kind of image analysis system is used to investigate the structural features of the traditional handmade papers made from Kenaf and Abutilon. The screen mark on the paper was identified and analyzed. The dusts, shives and fiber bundles were manifested and calculated. The relationship between basis weight of the traditional paper and mean gray level of the image was discussed in detail. Some methods to express the formation of traditional handmade paper were studied.

• Journal of the Korean Wood Science and Technology
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• 제44권1호
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• pp.135-146
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• 2016

국내에서는 열기계펄프 생산을 국내산 소나무(Pinus densiflora)만을 사용하고 있다. 가격적 측면에서 장점이 있지만 지속적인 수급이나 피치와 같은 문제점이 내재되어 있기 때문에 주원료를 대체할 수 있는 방안이 강구되어야 한다. 열기계펄프의 원료로서 국내산 소나무를 대체할 수 있는 수종으로 러시아산 가문비(Picea jezoensis), 러시아산 낙엽송(Larix leptolepis), 그리고 미얀마산 대나무(Phyllostachys bambusoides)를 선정하여 열기계펄프 특성을 분석하였다. 이들 원료들은 동일한 조건 하에서 열기계펄프로 제조되었다. 러시아산 낙엽송과 미얀마산 대나무는 펄프화 공정에 부정적인 영향을 미칠 수 있는 추출물 함량이 과량 검출되었다. 러시아산 가문비는 다른 수종들과는 달리 shive와 피치의 함량이 가장 적게 정량되었고, 리파이닝 에너지도 국내산 소나무에 수준으로 매우 적게 소모되었다. 열기계펄프의 백색도면에서는 가문비가 가장 높은 백색도를 나타내어 표백 약품의 절감에 기여할 수 있을 것으로 기대되었다. 결론적으로 러시아산 가문비가 공정 에너지 절감과 펄프 품질 향상 측면에서 국내산 소나무를 대체할 수 있는 가장 우수한 수종인 것으로 나타났다.

• 공업화학
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• 제8권6호
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• pp.1014-1021
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• 1997

수세미외 그물 섬유를 크라프트법, 알카리 아황산법, 아황산법, 알카리 과산화 수소법과 소오다법으로 펄프화하고, 안트라퀴논의 첨가와 미첨가 조건으로 구분하여 증해하였다. 이들의 고해와 미고해분에 대하여 주사 전자현미경(SEM), 섬유 품질 분석기(FQA), 섬유길이 분류기(Clark 4-Screen Classifier), 화상 분석기(Image Analyzer)를 이용하여 특성과 섬유의 구조를 비교 분석하였다. 그 결과는 다음과 같다. 1) 수세미의 섬유의 증해후 해섬 가능 기준의 Pulping 조건은 KP계($160^{\circ}C$, 2시간), ASP계($155^{\circ}C$, 4시간), PAP계($160^{\circ}C$, 1시간)에서 Kappa값이 각각 12, 25, 10 수준으로 비교적 낮은 Total Alkali(약 20%) 조건에서 적정 증해가 가능했다. 2) 각 펄프화별 펄프의 총 증해수율은 KP 50~55, ASP계 60~70, PAP계 45~50%로 SP계의 수율은 매우 높고, KP나 PAP는 일반 비목재나 목재와 비슷한 수준을 나타냈다. 3)NaOH의 투입량의 증가는 해섬능을 촉진하고, 섬유길이, Curl, Kink Index 등에서 품질의 형태 변화를 보였다. 4) 수세미외 섬유의 펄프화 공정에서 AQ첨가는 탈리그닌 촉진으로 해섬능이 현격하게 향상되고 섬유의 산화 분해를 방지하며, 고해 속도 상승과 피브릴화를 촉진하였다. 5) ASP계는 KP나 PAP보다 Bulk density가 높고, 섬유간 결합이 치밀하고, 섬유의 세포 손상이 감소되었다. 6) 수세미외 섬유는 "C" Stain에 의한 정색 반응으로 청색 또는 청회색의 맑고 투명한 세포벽을 갖는 정색 특성을 나타냈다.

• 펄프종이기술
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• 제43권5호
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• pp.27-33
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• 2011

Hemp bast pulp cooked at temperature below $100^{\circ}C$ followed by defibration by the knife and the valley beater, respectively was mixed with softwood pulp varying the amount of hemp pulp in order to find the optimum condition for making hemp-wood paper. Both the knife and the valley beaters contributed to the dispersion of pulp fiber well. Lots of shives were found when the knife beater was applied exclusively, but the fibers were dispersed well when freeness dropped to 600 mL CSF and 500 mL CSF by the valley beater. Air resistance decreased drastically below 500 mL CSF where rapid disrupture of pulp fiber occurred. As the values for freeness and hemp fiber content increased, so did roughness and bulk. It was apparent that the tear strength of hemp-wood paper was on the rise drastically as hemp fiber content increased. Nevertheless the optimum hemp fiber content of hemp-wood paper would be 20% considering the decrease in both tensile and burst strengths as well as sheet formation.