Optical Density of Yellow Prints at Coated and Uncoated Paper

Abstract

Optical Density is one of the important parameters used to control print quality. Optical density in print materials is form of interaction of ink with paper. This research is oriented to the investigation of optical density value of Yellow printing ink on coated and uncoated paper. The main purpose of this study is to analyze the effect of printing ink thickness on optimal density value. The optical density value of yellow prints obtained using densitometer measurement, printed using IGT method on coated and uncoated paper. Ink thickness variations are applied (0.8 - 9.6 μm). Density values was found to increase as the ink layer thickness increased to a certain point called the optimal density (2.4 μm ink thickness on coated paper and 4.5 μm on uncoated paper). Optical density of yellow printing ink on coated paper is higher uncoated paper, which relates to porosity on paper

Karakteristik Pola Pertumbuhan Bakteri Termofilik Isolat MS-12 dari Sumber Air Padas Mudiak Sapan

“…Semakin tinggi tingkat kekeruhan maka dapat dinyatakan bahwa tingkat pertumbuhan dari bakteri yang diujikan semakin baik. Sebaliknya, jika tingkat kekeruhan rendah maka dapat dinyatakan bahwa tingkat pertumbihan dari bakteri tersebut tidak baik (Suryadi et al, 2019).…”