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학술저널
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한국펄프·종이공학회 펄프·종이기술 펄프·종이기술 제36권 제1호
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2004.3
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1 - 8 (8page)

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One of the most frequently used method for measurement of the degree of sizing (viz., hydrophobicity) is the Stockigt test. However, the Stockigt test was influenced by various factors such as dropping height. dropping amount, dropping speed and viewing angle. The resultant data of the sizing degree on the same specimen also varied according to different testers. Thus, the Stockigt test should he modified to be regarded as a highly reliable and reproducible standard method. For modifying the Stockigt lest, it was required to quantify red coloration by reaction between l% ferric chloride and 2% ammonium thiocyante during Stockigt testing. The cameras capturing the serial images during the red coloration process were the CMOS (Complementary Metal Oxide Semiconductor)-type and CCD (Charge Coupled Device)-type cameras. For measurement based on KS M 7025, the CCD-type camera must be used due to its high resolution. and on the other hand, for measurement based on Tappi Useful Method 429, the CMOS-type camera may be used owing to its low resolution. It was needed to covert the RGB values of a droplet image into HSV(Hue, Saturation, and Value) values because the human eyes are much closer to HSV than RGB. Among HSV values. the Hue value was accepted as the most reliable index consistent with the red coloration process by excluding lhe surrounding conditions such as light. tester's movement etc.


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