1515 ディップコーティングプロセスに及ぼす引き上げ速度とせん断粘度の影響

概要

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In the present paper, we measured the filament length between the tip of the coated rod and the liquid surface when the filament broke in the dip coating process in the manufacturing of capsules, and examined the filament length dependence on the rheological properties of coating liquids and withdrawal velocity. The coating liquids were aqueous solutions of syrup (Newtonian liquids) and mixture liquids of aqueous solutions of syrup and polyacrylamide (polymeric liquids). Consequently, it is found that a large withdrawal velocity brings a shorter time at the filament breakage in Newtonian liquids regardless of their shear viscosities, while a large elongational viscosity causes a large filament length in polymeric liquids. The large withdrawal velocity was ineffective upon the reduction of the breakage time of the filament in polymeric liquids. Therefore, the use of polymeric liquids reduces the efficiency of manufacturing in dip coating process.
社団法人日本機械学会の論文
2003-08-05