High density printing paper quality investigation

Abstract

Light has been used to examine the quality of the products or surface finishing of most products by the industries in recent times. In this research, a lab module tester was designed and built to investigation on the different type of printing paper quality which available commercially was done. Laser light was utilized as a manipulator to distinguish the quality of printing paper and the light reflectance element was used. The photodiode was used as sensing element to detect the reflected light from the surface of printing paper. The both of laser diode and photodiode were placed in a light box. The laser was used to emit light on the sample and the photodiode detects light intensity from the surface printing paper in the light box. Different level of intensity correlates to different voltage output. The investigation on the different type of printing paper including of 70 g/m², 80 g/m² and 100 g/m² were done respectively. The result showed that the 100 g/m² printing paper has a higher reflected voltage output compared to 80 g/m² and 70 g/m² printing paper.

Decision-theoretic model to identify printed sources

“…Additionally, surface roughness of coated and uncoated papers influence the occurrence of print mottles [20]. It means the absorption of ink and fountain solution cause non-uniformity of ink transfer because of the surface roughness of paper [46]. The selection of paper will have strong impact for printing properties including a huge variety of characteristics such as its particle, chemical composition, and shape [19].…”

Digital forensics of microscopic images for printed source identification

“…3 The pipeline of printed source identification accuracy classification when both the training and testing sets use the same paper. By using micro-scale imaging, the different types of paper have varied structure and surface [43] which could influence the quality of the printed documents and images [38]. Since the surface of a sheet of paper is not perfectly flat, a printer will produce different images as a result of the different orientation of the pages.…”