Process control of printing processes with in-line NIR spectroscopy and elimination of the influence of the substrate on the prediction of the coating weight

Mirschel, Gabriele; Savchuk, Olesya; Scherzer, Tom; Genest, Beatrix

doi:10.1016/j.porgcoat.2012.08.016

Cited by 12 publications

(27 citation statements)

References 29 publications

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“…The influence of such factors, e.g., variation of the composition of the acrylate formulation, the substrate, or the degree of gloss of the printed layers, will be discussed in forthcoming papers. 34,35 Future work will also focus on the mounting of the probe head in the delivery unit of the printing press, which requires considerable technical effort due to the complex sheetconveying system. However, this kind of mounting of the probe head would not only allow measurements of the thickness of dried or cured layers, but also monitoring of the conversion of radiation-curable varnishes achieved after UV irradiation.…”

Section: Discussionmentioning

confidence: 99%

In-Line Monitoring of the Thickness of Printed Layers by Near-Infrared (NIR) Spectroscopy at a Printing Press

et al. 2012

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In this work, it is demonstrated that the coating weight of printed layers can be determined in-line in a running printing press by near-infrared (NIR) reflection spectroscopy assisted by chemometric methods. Three different unpigmented lacquer systems, i.e., a conventional oil-based printing lacquer, an ultraviolet (UV)-curable formulation, and a water-based dispersion varnish, were printed on paper with coating weights between about 0.5 and 7 g m(-2). NIR spectra for calibration were recorded with a special metal reflector simulating the mounting conditions of the probe head at the printing press. Calibration models were developed on the basis of the partial least squares (PLS) algorithm and evaluated by independent test samples. The prediction performance of the developed models was examined at a sheet-fed offset printing press at line speeds between 90 and 180 m min(-1). Results show an excellent correlation of data predicted in-line from the NIR spectra with reference values obtained off-line by gravimetry. The prediction errors were found to be ≤ 0.2 g m(-2), which confirms the suitability of the developed spectroscopic method for process control in technical printing processes.

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Section: Discussionmentioning

confidence: 99%

In-Line Monitoring of the Thickness of Printed Layers by Near-Infrared (NIR) Spectroscopy at a Printing Press

et al. 2012

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“…As is known to all, among an extensive range of fields, NIR can be used to monitor and derive a better understanding from the reaction process and measure the inpurity content of the product [52]. Chen [53] studied the curing kinetics and morphology of the interpenetrating polymer networks (IPNs) which were obtained from the mixture of rigid epoxy resin and flexible dimethacrylate resin.…”

Section: The Other Type Resin Controlled By Nir Spectroscopymentioning

confidence: 99%

Investigation of the Kinetics of Curing Reaction for the Resin Matrix Polymer Composite Based on Near-Infrared Spectroscopy

Jiang

Huang

et al. 2015

Applied Spectroscopy Reviews

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Because of near-infrared spectroscopy is a very rapid and non-destructive method for the simultaneous measurement on different constituents in the resin matrix polymer composite. This strategy has been applied in the synthesis of the resin matrix polymer composites. In this paper, we mainly review the control of curing reaction kinetics of the phenolic, epoxy resin, polyester resin, polyurethane, and other polymer resin based of NIR spectra, which is important to control the quality of the resin matrix polymer composites in the synthesis.

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“…39 Since varnish layers are transparent, a significant portion of the NIR probe light completely penetrates the thin layers. Depending on the specific nature of the substrate material (e.g., paper vs transparent polymer foil), it is reflected at the substrate to a greater or lesser extent.…”

Section: ■ Conclusionmentioning

confidence: 99%

In-Line Monitoring of the Thickness of Printed Layers by NIR Spectroscopy: Elimination of the Effect of the Varnish Formulation on the Prediction of the Coating Weight

Daikos

Mirschel

Genest³

et al. 2013

Ind. Eng. Chem. Res.

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Near-infrared (NIR) reflection spectroscopy was used for in-line monitoring of the coating weight of printed layers of acrylate-based clear varnishes. Quantitative analysis of the spectral data was carried out by means of chemometric techniques based on partial least-squares (PLS) regression. The influence of variations of the chemical composition of the varnish formulations on the multivariate calibration models may lead to mispredictions of the coating weight. Therefore, it was compensated by special calibration procedures. Two different approaches were compared. Single-stage universal calibration included the different varnish formulations into one joint PLS model. Alternatively, the multistage procedure combined a preliminary identification step with subsequent quantitative analysis using specific calibration models for each varnish. The efficiency of both approaches was investigated by the prediction of the coating weights of independent test samples. Moreover, in-line measurements were carried out at a sheet-fed offset printing press. Both methods efficiently eliminated the influence of variations of the chemical composition. However, the multistage approach led to more precise predictions. In in-line monitoring trials during printing, the coating weight (in the range between 0.8 and 7 g m −2 ) was determined with a prediction error of 0.25 g m −2 with the single-stage calibration model and 0.17 g m −2 using the multistage approach.

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Process control of printing processes with in-line NIR spectroscopy and elimination of the influence of the substrate on the prediction of the coating weight

Cited by 12 publications

References 29 publications

In-Line Monitoring of the Thickness of Printed Layers by Near-Infrared (NIR) Spectroscopy at a Printing Press

In-Line Monitoring of the Thickness of Printed Layers by Near-Infrared (NIR) Spectroscopy at a Printing Press

Investigation of the Kinetics of Curing Reaction for the Resin Matrix Polymer Composite Based on Near-Infrared Spectroscopy

In-Line Monitoring of the Thickness of Printed Layers by NIR Spectroscopy: Elimination of the Effect of the Varnish Formulation on the Prediction of the Coating Weight

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