Designing and Optimizing an Ink Cartridge for Use with Higher Viscous Inks
Abstract:A study is presented which demonstrates the design and optimization of an ink cartridge to be directly connected to the print head and to be used with higher viscous inks. A higher viscous ink is desirable for achieving a smooth drop formation with a low satellite content. On the other hand the increase of ink viscosity will also increase the ink flow resistance within the whole ink supply system. All the commonly used drop on demand firing ink jet heads require a back pressure in the ink supply system for balancing the capillary forces of the nozzle orifices. A high flow resistance of the supply system will add another component to the back pressure of the cartridge, which is dependent of the amount of nozzles fired at a time. This may result in an uneven print appearance - for example areas will print lighter than characters. This is because the ink drop volume is dependent on the negative pressure. Hence the design target for the cartridge should be:
• a minimization of the impact of the flow resistance throughout the whole operation window of the print head and cartridge,
• an even back pressure curve with a moderate increase during the cartridge ink supply period and
• a high ink yield of the cartridge.
From a detailed discussion of the design process important parameters are derived, concerning:
• the material selection,
• the cartridge construction and engineering and
• testing and approval.
In the result a cartridge functionality is achieved, which allows printing with an arbitrary work load throughout the operation window with small restrictions in the low temperature regime.
Document Type: Research Article
Publication date: 2001-01-01
For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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