Deinking of Thermal Inkjet Newsprint
In this paper, we show that inkjet-printed newsprint can be satisfactorily deinked via chemistry based on our near-neutral HPES deinking chemistry, described previously . Two kinds of chemicals are used; the “E” in HPES is ethoxylated fatty alcohol, which interacts with the ink and fibers, separates them and prevents the ink from reattaching, while aggregating small ink particles into larger ones. The “S” in HPES is a small amount of an ionic surfactant added into the flotation cell, which facilitates the creation of bubbles which carry particles to the top where they can be skimmed off with the froth, leaving the clean pulp fibers to be recovered. We studied the effect of pH, collecting and clarifying agents, water hardness, chemical loading, and bleaching chemistry on filtrate darkening. In particular, we have found that the color shade and brightness of the deinked pulp and the process water can be significantly enhanced with the addition of a suitable collector or flocculating agent, in this case aluminum sulfate.
Document Type: Research Article
Publication date: 2012-01-01
For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.
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