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Monday, 23 September 2019
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Raw materials & technologies, Technologies, UV/EB Coatings

Using NIR reflection spectroscopy for process control in printing technology

Friday, 19 September 2014

Near-infrared (NIR) reflection spectroscopy was used for in-line monitoring of the conversion in printed layers of a UV-curable cyan printing ink at an offset printing press.

Conversion and migration were monitored in-line at an offset printing press.

Source: Goss-Vitalij/Fotolia

Conversion and migration were monitored in-line at an offset printing press.

Source: Goss-Vitalij/Fotolia

Quantitative analysis of the spectra was based on the calibration of the method with chemometric approaches using reference data for the conversion obtained by FTIR/ATR spectroscopy.

Acrylate migration depends linearly on the conversion

In this way, the conversion in ink layers with a thickness of 0.8 g m−2 was determined with a precision of 5%. Moreover, it was shown that the specific migration of the acrylate components in the binder of the printing ink was linearly dependent on the conversion in the studied range between about 80% and 100%, which allowed an estimation of the specific migration from conversion data. The strict linear relation between both parameters was used for indirect in-line monitoring of the acrylate migration during the printing process by predicting it from the conversion data derived from the NIR spectra. For comparison, off-line measurements on random samples by HPLC were carried out. The error of the predicted migration data in comparison with the results of the analytic measurements was found to be about 0.03 mg dm−2. The proposed indirect prediction of the migration will allow a better and more direct control of technical printing processes.

The studiy is published in: Progress in Organic Coatings, Volume 77, Issue 11, November 2014, Pages 1682-1687.

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