On-demand printing paper movements (2)
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The process that affects the image quality is the toner transfer and fixing process. The dry toner is used to form an image on the photoreceptor, and is transferred to the paper directly or via an intermediate transfer body. The transferred energy is corona discharge or the electric field is applied by the transfer roller. The charged toner is transferred to the paper for imaging. If liquid toner is used, Indigo's E-print is famous, and the toner is transferred from the photoreceptor. It is printed on the blanket and the image on it is transferred to the paper again. Accordingly, it can be understood that the former is the charged physical property of paper, and the latter affects the image quality by the surface smoothness and chemical affinity of the paper.
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Fixing with dry toner, depending on the heating roller or infrared heating, can be completed in an instant, but when the toner and paper are exposed to 150~200 °C, the wrinkles will be caused by the moisture change of the paper. The reason for shrinking and hitting waves. For this reason, papermaking conditions are required to cope with the change in moisture of the paper, to reduce the expansion ratio and the residual stress during drying, to improve dimensional stability, and to suppress wrinkles. In addition, since a large amount of paper is printed at a high speed, paper powder and chemicals should be prevented from causing roller wear and deterioration of the photoreceptor.
On-demand printing paper
The market for on-demand printing will become more and more broad in the future, such as mail order advertisements, advanced product samples, company introductions, various samples at the exhibition, and gift data. In order to adapt to these uses, it is necessary to consider developing and producing papers that meet the purpose of use. This is a new market demand and the prospects are limitless.
The specific requirements for on-demand printing paper to be developed are shown in the table below:
POD super glossy paper has high affinity for the surface of the coated paper and the toner, and relies on the polymer layer which can be mutually dissolved to make the surface composition achieve a uniform high gloss. The gloss of POD-strength gloss and matt paper is 65%, 6% of the coating layer is applied on the surface, the gas permeability is high, the toner transferability is good, the heat is fixed, the foaming is suppressed, and the sheet is on the sheet. It also shows good paper-feeding properties.
POD-strength glossy paper is a coated paper for offset printing. Compared with coated paper for electrophotography in the European market, in order to improve foaming during heating, it is desirable to have the same gloss, and paper with low air permeability is suitable. .
The POD film coating relies on the electrical characteristics to achieve the optimum, even if the weight is large, the toner transferability is superior, and the heating does not wrinkle during fixing.