透過您的圖書館登入
IP:3.236.147.122
  • 期刊
  • OpenAccess

FFT頻譜分析及摩擦係數應用於紙張平滑度評估之可行性研究

Feasibility Study on Evaluation of Paper Smoothness by Using FFT Spectrum Analysis and Friction Coefficient

若您是本文的作者,可授權文章由華藝線上圖書館中協助推廣。

摘要


This study aimed to establish novel methods for testing paper surface smoothness with roughness tester method followed by FFT spectrum analysis, and with a friction coefficient method. Comparisons were made with a conventional smoothness testmethod, the Bekk smoothness test, for 20 commericial coated and uncoated papers. Comparison of roughness values (Ra or Rtm) of these papers with those of Bekk smoothness suggests that, in the lower smoothness range (below 100 Bekk smoothness values), here was a fair degree of correlation between them. For semi-smooth papers (Bekk values of 200 to 500), the 2 methods had low correlations, whereas there appeared to be no distinct correlation for speciemens in the high smoothness range (Beak values of 500 and above). The coefficient of correlation (COC) between the 2 methods was 0.74. Based on the experimental results, the roughness method appears to be suitable for measuring specimens in the low smoothness range, whereas FFT spectrum analysis is more appropriate for measuring papers with high smoothness. After surveying the surface profiles of the high smoothness specimens, the profile was filtered to remove the waviness of the paper surface roughness profile obtained Transformation of this profile to the FFT spectrum was made. From the frequency distributions of the depths of the concaves and convexes and the accumulative frequency curve, smoothness of the paper surfaces was thus determined. This method avoids deviations arising from waves, folds, creep, or rolling of the paper surfaces. Second-order polynomial regressions between the Bekk smoothness values and the surface friction coefficients of the specimens gave a COC 0.86. If the lowest smoothness range (Bekk values of 60 or less) was excluded, however, then the COC shot up to a much higher value. The second-order polynomial regression between the friction coefficients and the logarithm of roughness values gave a COC of 0.94. If again, the lowest smoothness or the highest roughness range (with Ra values >3μm which are equivalent to Bekk values <70 sec/l0mL) was excluded, then the COC increased to a higher value. Based on these results, we conclude that the friction coefficient method is fairly suitable for the measurement of specimens with smooth paper surfaces.

並列摘要


This study aimed to establish novel methods for testing paper surface smoothness with roughness tester method followed by FFT spectrum analysis, and with a friction coefficient method. Comparisons were made with a conventional smoothness testmethod, the Bekk smoothness test, for 20 commericial coated and uncoated papers. Comparison of roughness values (Ra or Rtm) of these papers with those of Bekk smoothness suggests that, in the lower smoothness range (below 100 Bekk smoothness values), here was a fair degree of correlation between them. For semi-smooth papers (Bekk values of 200 to 500), the 2 methods had low correlations, whereas there appeared to be no distinct correlation for speciemens in the high smoothness range (Beak values of 500 and above). The coefficient of correlation (COC) between the 2 methods was 0.74. Based on the experimental results, the roughness method appears to be suitable for measuring specimens in the low smoothness range, whereas FFT spectrum analysis is more appropriate for measuring papers with high smoothness. After surveying the surface profiles of the high smoothness specimens, the profile was filtered to remove the waviness of the paper surface roughness profile obtained Transformation of this profile to the FFT spectrum was made. From the frequency distributions of the depths of the concaves and convexes and the accumulative frequency curve, smoothness of the paper surfaces was thus determined. This method avoids deviations arising from waves, folds, creep, or rolling of the paper surfaces. Second-order polynomial regressions between the Bekk smoothness values and the surface friction coefficients of the specimens gave a COC 0.86. If the lowest smoothness range (Bekk values of 60 or less) was excluded, however, then the COC shot up to a much higher value. The second-order polynomial regression between the friction coefficients and the logarithm of roughness values gave a COC of 0.94. If again, the lowest smoothness or the highest roughness range (with Ra values >3μm which are equivalent to Bekk values <70 sec/l0mL) was excluded, then the COC increased to a higher value. Based on these results, we conclude that the friction coefficient method is fairly suitable for the measurement of specimens with smooth paper surfaces.

延伸閱讀