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High-Quality Deinked Pulps via Alkaline-based HPMA Deinking Chemistry

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In this paper we present an alkaline-based deinking chemistry (coded HPMA), which facilitates deinking of digital as well as conventional print media. The novel method presented here, HPMA, uses traditional alkaline deinking chemicals including sodium hydroxide and sodium silicate, but with the substitution of a readily-available emulsifier, a non-ionic surfactant, for the traditional fatty acid. The chemistry is based on methodical structural-physical understanding of properties of digital inks applied to deinking chemicals and deinking processes, to achieve high-quality deinked pulps at lab scale. The resultant chemical composition serves effectively as a release agent for the ink from the paper fibers and a collecting agent to agglomerate the particles to achieve ink particulates with the desired size range and provides the desired interfacial interaction with the foam for eventual removal during the flotation. High quality deinked pulps of HP-Indigo ElectroInks, HP Inkjet pigment/dye-based inks and HP dry toners were successfully obtained via HPMA. Similarly good results were obtained for traditional offset inks and mixed office waste with HPMA, suggesting the generic nature of our deinking chemistry.

Document Type: Research Article

Publication date: January 1, 2010

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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