Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
권호 표지

Development of a Novel System for Measuring Sizing Degree Based on Contact Angle(I) - Development of a Novel Principle for Automatic Measurement of Contact Angle -

접촉각 측정 원리를 이용한 새로운 사이즈도 측정기 (제1보) -자동 접촉각 측정 원리의 개발 -

  • 이찬용 (태광화학㈜) ;
  • 김철환 (경상대학교 농업생명과학대학 임산공학과) ;
  • 최경민 (㈜미래로시스템 기술연구소) ;
  • 박종열 (경상대학교 농업생명과학대학 임산공학과) ;
  • 권오철 (한국포장개발연구원)
  • Published : 2003.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

The new principle to measure a sizing degree by a contact angle was developed using an automatic determination of the 3-end point coordinates of the water droplet on a sheet, which could diminish the operator's bias during measurement. A constant amount of water was first placed on a sample sheet by a water dispenser, and then an image of the liquid droplet was captured by a digital camera and then transmitted to a computer. The program measuring for contact angle extracted a liquid contour by Gaussian function combined with a 8-direction chain code. The Euclidean equation was applied to the binary image of the liquid contour in order to measure the diameter of the contour. Finally, the contact angle of the liquid was calculated by using the diameter and the top coordinates. In addition, a surface free energy of the sample sheet and an elapsed time taken up to the complete absorption into the sheet were simultaneously measured with the contact angle.

Keywords

References

  1. Sizing of Paper Reynolds,W.F.
  2. TAPPI T 441 om-98 Water absorptiveness of sized (non-bibulous) paper, paperboard, and corrugated fiberboard(Cobb test)
  3. KS M 7025 Testing method for sizing degree of paper(Stockigt method)
  4. TAPPI T 831 om-99 Water absorption of corrugating medium: Water drop penetration test
  5. TAPPI T 530 om-96 Size test for paper by ink resistance (Hercules-type method)
  6. TAPPI T 433 cm-84 Water resistance of sized paper and paperboard (Dry indicator method)
  7. TAPPI T 832 om-98 Water absorption of corrugating medium: Float curl method
  8. TAPPI T 431 cm-99 Ink absorbency of blotting paper
  9. TAPPI T 458 cm-94 Surface wettability of paper (angle of contact method)
  10. TAPPI T 558 om-97 Surface wettability and absorbency of sheeted materials using and automated contact angle tester
  11. Papermaking Chemistry, in a series of Papermaking Science and Technology Leo Neimo
  12. Principles of Colloid and Surface Chemistry Surface Tension and Contact Angle Hiemenz,P.C.
  13. IEEE Trans. Elec. Computers v.EC-10 On the Encoding of Arbitrary Geometric Configurations Freeman,H.
  14. Probability, Random Variables, and Stochastic Processes Papoulis,A.