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Crystal Engineering of Pigments for Permanence

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Continuously improving demands upon the permanence of inkjet colorants have seen an increasing trend towards the use of pigments rather than dyes for applications such as outdoor signage printing. Appropriate selection of pigments for the formulation of YMC inks must be made to ensure that all components fade uniformly in order to preserve image colour quality for the longest possible duration. The permanence of a pigment can be influenced by control of the primary particle size distribution, which is well known to have a great bearing upon the resistance and coloristic properties. As primary particle size increases, a reduction in gloss, transparency and colour strength are observed, combined with an increase in permanence. Armed with this knowledge it is possible to “size engineer” pigment particles that will allow specific degrees of colour permanence to be achieved. Experimental work was carried out to manipulate the particle size of pigment Yellow 151 into small, medium and large size forms, which were then compared to one another in terms of permanence, gloss, opacity and colour strength. Physical reaction parameters used in synthesis were employed to control the pigment particle size. Small sized particles were synthesized by inducing rapid, homogeneous nucleation of the pigment. Large particles were formed by reducing the rate of nucleation followed by controlled crystal growth.
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Document Type: Research Article

Publication date: 2002-01-01

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  • 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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