Convenient Calculating Method of Viscosity by Means of Fusion Flow Test for Frits

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  • フリットのフュージョン・フロー・テストより粘度値を求める簡便法について
  • フリット ノ フュージョン フロー テスト ヨリ ネンドチ オ モトメル カンベンホウ ニ ツイテ

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Calculating methods of viscosity for porcelain enamels from the fusion flow test which had been already presented by P. Decker is rather complicated, because those include the inherent value for each frit, i.e., flow point or the maximum flow point which were somewhat hard to preestimate.<br>Therefore, in order to derive the more convenient experimental formula, the following experiments were carried out.<br>Several kinds of silicone oils of known viscosity, 3, 000 c. s., 6, 000 c. s., 10, 000 c. s., 30, 000 c. s. and 100, 000 c. s., were fusion flow tested on the glazed wall tile which was kept in 45′ inclination, and the relationship between flow length F, flow time t, and viscosity η was investigated.<br>As the results of above experiments, exponential function between both F and t, or F and η was obtained, and thus, F=A⋅tK was derived where A is the mean flow ratio and K is the exponential constant for time.<br>K was estimated to be 0.453, while A was a function of η, i.e., A=BηK′, where B was 310 and K′ was -0.429.<br>However, after the various flow resistances in fusion flow test was considered, K′ must be corrected to be -0.386, and then<br>F=310η-0.386t0.453<br>was derived as the calculating formula from the fusion flow test of various kinds of frits.<br>In order to check the above experimental formula, the fusion flow tests of various frits were run, and the obtained viscosity value from F and t were fairly well coincided with one estimated by the pulling up-sphere type viscometer.

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