Developing a new Inkjet Paper
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Helsinki University of Technology |
Diplomityö
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Date
2004
Department
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Paperitekniikka
Mcode
Puu-21
Degree programme
Language
en
Pages
98
Series
Abstract
Coating technology has afforded papermakers a way to advance in manipulating the final product to suit the paper properties that are required by the printing industry. The base paper quality still needs to be at a high level to produce a high quality coated product. The use of inkjet printers in small office home office (SOHO) environment is growing. The growth of the use of digital cameras has opened a market for a paper grade which is one step up from the normal surface sized office and copier papers. In South Africa there is no inkjet paper grade currently being produced so users have to buy expensive imported paper if they want high quality prints. The objective of this experiment was to develop an inkjet paper grade which would cost less than the commercially available papers in South Africa while having better print properties than office paper. The experiments involved formulating a series of coating colours in the lab, each aimed at improving the printability of paper in a HP Deskjet printer using DOD thermal inkjet technology. A surface sized office paper was chosen as the base paper for all experiments. The papers were coated in the laboratory coaters using a profiled rod metering system. The target pick-up was 5g/m[2] due to the cost of the formulations. The coating mixes went through some standard tests, solids, viscosity and pH. The coated paper were then visually assessed in terms of print quality which included colour to colour bleed, feathering uniformity of print and colour brilliance. The colour density (optical density) was measured using a reflection densitometer. Silica gel based coatings with PVOH as the sole binder are accepted in the industry as the best for inkjet papers. It was discovered that adding calcium carbonate and cationic starch into the mix lowered the cost of the formulation while improving print quality in properties like colour to colour bleed and feathering.Description
Supervisor
Paulapuro, HannuThesis advisor
Krüger, KarinKeywords
inkjet, inkjet (mustesuihku), coating formulations, päällystepastat, print quality, painojäljen laatu, paper properties, paperin ominaisuudet