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Though many commercial sheet formation testers have been designed with high technologies as has been discussed in a previous paper of this study, they have not come into wide use in Japan. One of the possible reasons for this is a paper maker's distrust as to the testers corresponding with his subjective evaluation. To clear up his doubt, a quantitative determination of his subjective evaluation for comparison with results by the testers would be required, but few reports have been published on the subjective test of the sheet formation. For these reasons, the present work deals with a subjective test of sheet formation with light transmission for the samples used in the previous paper, which were studied using a paired comparison method and analyzed by the Scheffe's method.One hundred eighty three panelists, including eight paper making companies, three printing companies, two xerography makers, four wholesale dealers, two book publishers, two official institutes and two universities in Japan have collaborated with this work. The results on the consistency test for the paired comparison data by the circular triad method showed that 90 percent of the panelists had a judgment ability to evaluate sheet formation and the subjective sheet formation might be concerned as one dimensional scale. The variance analysis for the paired comparison data by Scheffe's method led to a conclusion the main effect of the Scheffe's model (sensory value of sheet formation) might not be influenced by an individual preference and combinations of the samples. Being on the market as a same product grade, the samples had a wide range of sheet formation as sensory value. Since the sensory value of sheet formation for each sample was determined quantitatively, a comparison of these results on the subjective test with sheet formation testers would be available.

Evaluation of Sheet Formation with Light Transmission Image. Part II. Subjective Test by the paired comparison method.