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Measurement and Modeling of Drop Absorption Time for Various Ink-Receiver Systems

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An inkjet visualization setup was used to measure the drop absorption time of various ink-receiver systems. The drop absorption time is defined as the time required for the receiver to completely absorb the impinging ink drop (i.e., the drop totally penetrates into the receiver and disappears from the receiver surface). The inkjet visualization setup consists of a piezo printhead with drive electronics, an aluminum drum for receiver support, a strobe light, a CCD camera, imaging optics, and image capture system. The drops ejected from the printhead have a volume of about 25 pL and a velocity of about 5 m/s. The receivers used in the measurements include both non-porous and porous receivers. Results indicate that non-porous receivers with swellable polymeric coatings have a much longer drop absorption time (>30 s) than those receivers with porous coatings (∼33.3-100 ms). The difference in drop absorption time between non-porous and porous receivers can be ascribed to the basic difference in the physical mechanisms of ink penetration into the receiver, i.e., diffusion of ink in the polymeric receiver versus capillary flow of ink in the porous receiver. Based on these physical phenomena, simple one-dimensional models have been developed to describe the drop absorption process in the non-porous and porous receivers. The dependence of drop absorption time on the volume of ink drop and physical properties of ink (such as viscosity and surface tension) and receiver (such as diffusion coefficient and porosity) was also derived. Comparison of model results with experimental data will be presented and discussed.

Document Type: Research Article

Publication date: January 1, 2002

More about this publication?
  • 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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