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Laboratory Scale Two-loop Deinking Trials

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Abstract:

Here we describe our work on the design of a laboratory-scale two-loop deinking process with inclusion of a low-speed high shear kneading step in between two flotation steps. Our approach was then applied to evaluate the deinkability of MOW (mixed office waste) and mixtures of MOW with various amounts of digital print products (where liquid electrophotographic (LEP) prints were used as an example of digital print products). The process conditions at respective stages were optimized to closely mimic that of representative mill-scale processes. The effect of deinking chemistries was also evaluated, with a particular emphasis on nonionic surfactant-based neutral chemistries. The evolutions of dirt area, dirt counts, speck size and optical properties with respect to process stages were monitored to determine the efficacy of our approach. We show that with controlled flotation yields (∼ 80% in the pre-flotation, ∼ 97% in the post-flotation), the kneading step facilitates noticeable reduction in dirt area. The average speck size was noticed to fall within the perceived deinkable range (i.e. 5-200 microns). It is noteworthy to observe that the two-loop process successfully brings the dirt area for MOW with LEP prints (5% and 20%) to a satisfactory level.

Document Type: Research Article

Publication date: 2013-01-01

More about this publication?
  • 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.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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