オフセット印刷物の光沢の検討

Abstract

To study the printed surface, gloss of the solid area was investigated. Gloss of three kinds of papers, which were printed black ink for off-set printing, were measured by an aid of a goniogloss meter with a hand-made slit (angular aperture : 1.8). In the series of cast corted papers printed, the minimum specular gloss (Gs) was obtained in the sample printed the amount of 0.1 to 0.3(gm)^<-2> of ink. The Gs increased rapidly with increasing of the printed ink until 2.0(gm)^<-2>. The maximum valus was obtained in the sample with ca. 6.0(gm)^<-2>. Half band widths of gloss (θ_<1/2>) were also measured. The θ_<1/2> is almost in verse proportion with the Gs value. The missing dot in the sample printed small amount of ink was also discussed by an aid of an image analyzing apparatus.