知覚による紙と印刷の品質評価 Ｉ 上質紙の品質評価

Abstract

Although many analytical and testing methods for various properties of paper are available, not all of them are satisfactory for evaluating paper quality for its end use. In many cases, subjective judgement by human sense is known to be better for quality evaluation of paper than the objective tests. In order to understand the implication of sensory evaluation, paper and print qualities were evaluated by a large number of panelists from paper maker and user. As the first series of investigations the results of sensory evaluation on 9 samples of commercial wood-free printing paper is presented in this paper. Properties related to the color of paper were correlated each other well in both paper maker's and user's evaluations. Opaqueness showed fair correlation with smoothness, texture etc only by paper maker's judgement. Formation and thickness of paper correlated well indicating that thickness is an influential factor for the judgement of formation. Factor analysis of correlation matrix gave major independent factor for paper quality evaluation. Three factors extracted from maker's evaluation are color property, surface property and formation. On the other hand, by user's evaluation there is only one major factor extracted, which involved all three properties.