สำนักราชบัณฑิตยสภา

Printing Properties of Water-based Pigmented Inkjet Inks on the Oxygen-plasma Modified Polylactide Sheets 228 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 where γ ι = surface tension of test liquid, γ s = total surface energy of printing substrate, γ s = dispersion contribution of surface energy γ s = polar contribution of surface energy, γ ι = dispersion contribution of test liquid, γ ι = polar contribution of test liquid, and θ = contact angle of test liquid. γ ι (1+cos θ 1 ) = 2[( γ s γ ι ) + ( γ s γ ι ) ] (1) γ s = γ s + γ s (2) d p d p 1 2 1 2 d p d d p p Figure 1 Diagram of the radio-frequency (RF) inductively coupled oxygen plasma reactor.