초지 조건이 광투과 주사법이 그레이 값에 미치는 영향

조용민; 안원영; Yong Min Cho; Won Yung Ahn

Journal of the Korean Industrial and Engineering Chemistry, Vol.13, No.8, 836-843, December, 2002

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초지 조건이 광투과 주사법이 그레이 값에 미치는 영향

Effect of Papermaking Conditions on Gray Level of Light Transmission Scanner Method

조용민^†, 안원영¹

한국골판지포장공업협동조합 정보기술팀, 서울 137-060
¹서울대학교 임산공학과, 수원 441-744

Yong Min Cho^†, and Won Yung Ahn¹

Information and Technology Team, Korea Corrugated Packaging Case Association, Seoul 137-060, Korea
¹Department of Forest Products, College of Agriculture and Life Sciences, Seoul National University, Suwon 441-744, Korea

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초록

종이의 광투과 시 투과된 광의 명암도는 지역 광학밀도와 평량에 따라 다르다. 이러한 특성을 활용하여 화상 히스토그램에 의한 진폭의 중간값인 그레이 값(gray level)을 측정하여 화상분석법으로 종이의 물성을 간접 평가가 가능할 것으로 판단된다. 따라서 본 본문에서는 화상 입력장치인 광투과 주사기를 이용하여 관계습도 65±2%, 온도 20±2 ℃에서 조습한 종이 시험편을 주사하여 화상처리로 얻은 그레이 값과 종이의 평량, 탈수 전 체류시간, 고해도, 밀도 및 압체압력과의 관계를 규명하였다. 광투과 주사 시험용 수초지는 침엽수 미표백 크라프트펄프(SwUKP)와 침엽수 표백 크라프트펄프(SwBKP)를 20, 25, 30, 35와 40 °SR로 고해하고, 초지 시 탈수 전 체류시간(retention time)을 0, 30, 60과 90 sec로, 그리고 평량을 30, 45, 60, 75, 90, 105와 120 g/m²로 각각 제조하였다. SwUKP와 SwBKP의 고해도 및 체류시간과 평량에 관계없이 수초지의 그레이 값은 SwBKP 수초지가 SwUKP 수초지보다 더 높았다. 그리고 수초지의 평량이 증가할수록 그레이 값은 직선 혹은 지수적으로 감소하였다. 또한 동일평량 수초지의 경우, 고해도가 증가할수록 그레이 값이 감소하고 체류시간이 늘어남에 따라 그레이 값이 증가하는 경향을 나타냈다. 이는 수초지에 광투과 주사된 광의 명암도 차이가 작기 때문으로 판단되어진다.

On the basis of the gray level derived from mean amplitude in distribution of level amplitude being dominated by optically transmitted local light intensity and the basis weight of the paper by light transmission scanner, the image analysis on gray level for handsheets conditioned in humidity chamber with RH 652% at 20±2 ℃ was examined. This effect was to elucidate the relationship between the gray level and the properties of basis weight, degree of beating, retention time, density and press pressure of handsheets. Handsheets of SwUKP and SwBKP for scanning light transmission were prepared at beating degree of 20, 25, 30, 35 and 40; SR, retention time of 0, 30, 60 and 90 seconds; and basis weight of 30, 45, 60, 75, 90, 105 and 120 g/m². Light transmission image was closely related to gray level and basis weight. Gray level of SwUKP and SwBKP handsheets decreased in a linearly or an exponentially with increasing basis weight, and the level of SwUKP handsheets was higher than that of SwBKP. On the same basis weight of both SwUKP and SwBKP handsheets, high beating degree resulted low gray level of handsheets. However, the level increased with increasing retention time due to the no clear difference in transmitted intensity on the handsheets.

Keywords:gray level;light transmission scanner;basis weight;degree of beating;retention time;density;press pressure;SwUKP;SwBKP

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[1] Bernie JP, Douglas WJM, TAPPI J., 79(1), 193 (1996)

[2] Bernie JP, Hashemi SJ, Douglas WJM, Image Analysis Revised: Paper Formation and Moisture Content Measurement from Wet to Dry, 1995 International Paper Physics Conference Proceedings, 33 (1995)

[3] Bernie JP, Douglas WJM, Paper Strength-Paper Formation Relations, 84th Annual Meeting Proceeding, Technical Section, CPPA, A329 (1998)

[4] BMI Plus, Operation Instrument Version 1.20, Bummi Universe Co. Ltd. (1997)

[5] Boeckeman P, TAPPI J., 75(12), 166 (1992)

[6] Charles LA, Waterhouse JF, The Effect of Supercalendering on the Strength Properties of Paper, 1997 Paper Physics Conference Proceeding, 177 (1997)

[7] Chatterjee A, Roy DN, Whiting P, Effect of Recycling on Strength, Optical and Surface Properties of Handsheets, 78th Annual Meeting Proceeding, Technical Section, CPPA, A277 (1992)

[8] Crane RA, Simplified Approach to Image Processing-Classical & Modern Techniques in C., Prentice-Hall (1997)

[9] Dodson CTJ, TAPPI J., 76(5), 153 (1993)

[10] Komppa O, J. Korea Tappi, 29(2), 76 (1997)

[11] Nam WS, Park JM, J. Korea Tappi, 30(3), 57 (1998)

[12] Thrope JL, Appita, 36(3), 197 (1982)

[13] Tomimasu H, Kim D, Suk M, Luner P, TAPPI J., 74(7), 165 (1991)

[14] Trepanier RJ, Formation Measurement with the Paprican Micro-Scanner, OpTest Equipment Inc. Hawesbury, ON, Canada (1993)

[15] Trepanier RJ, J. Pulp Paper Sci., 13(4), J111 (1987)

[16] Yuhara T, Hasuike M, Murakami K, TAPPI J., 40(1), 85 (1986)

[17] Yuhara T, Hasuike M, Murakami K, TAPPI J., 41(6), 59 (1987)