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A New Approach to Image Fixing Quality Assessment - A Pen Offset Apparatus and Image Processing Analyzer
Charlie M. Mao and Alex Ozerov, Research Laboratories of Australia (Australia)
Abstract
The fixing quality of printed images has been conventionally characterised by the adhesion strength between the image and the substrate, and by the cohesion strength within the image layer. In general, techniques such as the simple tape test and the crockmeter test have been used to evaluate adhesion and cohesion strength respectively. These two test methods are convenient and easy but they can be unreliable due to large variations in the force applied during the tests, and in the selection of areas for optical density measurement to attain consistent results.The pen-offset method has also been used to assess fixing quality. In this technique a print is placed face down on a piece of blank paper, and a pen used to write on the back of the image. The fixing quality is judged by visually inspecting the offset image on the blank paper. The test result strongly depends on applied force and on the evaluator’s experience.
The authors have recognised the benefits of the pen-offset method, particularly its ability to assess both adhesion and cohesion strength simultaneously. They have developed a pen-offset apparatus, which can apply a constant pressure while writing on the back of the image. An image-processing module has also been developed and compiled into open source code software to evaluate the pen-offset image. The method produces reliable and reproducible results, and reduces the assessment time.
This paper will introduce the new pen-offset apparatus and the methodology for image analysis using a newly developed image processing software.
About the Authors
Dr Charlie Mao received B.Eng and M.Eng degrees in China in the early 1980s and a Ph.D. in Australia in 1995. After working as a university lecturer in the area of mining technology, and as a research scientist in soil science, he is now a senior research physicist at Research Laboratories of Australia. Since joining RLA, he has been investigating the mechanisms of image development and process optimization, and quality analysis of image and image fixing since he joined RLA in 1996. His theoretical and experimental work has contributed to the steady advance of novel liquid electrophotographic technologies.
Published in
NIP22: International Conference on Digital Printing TechnologiesDenver, Colorado; September 2006; p. 458-462; ISBN / ISSN: 0-89208-263-1
PDF Price:
IS&T Members: $0.00
Non-members: $12.00
