Wet Trapping

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  • ウェット・トラッピング
  • ウェット トラッピング オフセットインキ ノ インサツ テキセイ
  • Printability of Off-set Ink
  • オフセットインキの印刷適性

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Abstract

Several theories such as cavitation theory or shock wave theory concerning the wet-trapping have been already proposed, but they can not be explained well the wet-trapping. So the authors tried to explain the wet-trapping by the dynamic viscoelasticity, and the following consequences were obtained.<br>1) Dynamic viscoelasticity has not always a mutual relation with the kind of pigments and resins as well as tack value.<br>2) The value of dynamic viscoelasticity measured in the region from 102-1 to 103sec-1 have a interrelation with the wet-trapping. Good wet-trapping occurs only when each successive ink has a lower dynamic viscoelasticity than the one immediately preceding it.<br>3) The above mentioned relations hold for every printing materials.

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