The Development and Application of Capillary Coating Technology in Micropattern
Date Issued
2010
Date
2010
Author(s)
Pan, Po-Ting
Abstract
Printing technology becomes more and more important for circuitry manufacture, due to the advantages of cheap equipments, low time consuming and high material utility rate. There are many kinds of methods have been developed, among which screen printing and inkjet printing are the most popular technologies. However, these two technologies still have some problems and limitations. Screen printing has the limitations of low pattern resolution (>40μm) and high operation material viscosity (>1000cp). Moreover, the screen mesh has to remake if the pattern is changed. The maskless technology, inkjet printing, can produce high resolution patterns (~50μm), but it is also limited by the materials viscosity (<30cP). Here, we have developed a kind of direct patterning technology, capillary coating, to pattern silver ink (~240cP). Different sizes of capillary tubes (20 μm -200 μm) have been tested to directly “write” the arbitrary patterns of circuits on glass and PET substrates. To control circuit morphologies and circuit electricity, such as width (W), thickness (T) resistance (R) and resistivity (ρ), the operation parameters have been investigated as followings: head diameter (D), coating velocity (V), tip-to-substrate distance (G), and liquid altitude inside the capillary (H). These results will be summarized and reported in this article.
Subjects
Direct-writing
Capillary coating
silver ink
Type
thesis
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