Fig. 5. Inkjet printed dot area for 120 pl (top) and 30 pl (bottom) drop size. A large dot area indicates more intense spreading of the liquid drop. The printing liquid has high (↑), medium (⊗) or low (↓) viscosity (η) and surface tension (γ) as described in Table 1. For details on the printing substrates see Table 2. Bars are 95% confidence limits. Low viscosity increases the spreading. Surface tension plays a minor role as long as the substrate is not hydrophobised. Here, low surface tension eases spreading.