| 摘要 |
<p>The invention relates to a continuous dryer for web-fed rotary offset printing machines for drying printed webs of material, furthermore to the operation of such a continuous dryer during printing and blanket washing with checking of the gaseous and vapour proportions of ink, washing fluid and burner.
<??>According to the invention, an IR radiation path (11) is arranged in the dryer in order to measure the main concentrations of the gas/vapour proportions located in the gas chamber using IR absorption. The process followed by the continuous dryer can thus be oriented to evaporation rates of the volatile components.
<??>In the IR absorption measurement, spectral measured values of substance vapours of the offset printing ink appear during printing and of substances of the cleaning agent during blanket washing in accordance with their characteristic band position and intensity.
<??>In the transition from printing to blanket washing, an immediate picture is produced of the curve of the gas/vapour concentration level corresponding to the band intensities. Depending on the concentration limit, intervention in the adjustment of the flow (4), heating (2) and ventilation equipment of the dryer or targeted metering of the cleaning agent are derived.
<??>Deflagrations in the dryer are avoided due to the lack of delay time in on-line measurement in the case of rapid adjustment reaction or precalculated adjustment.
<??>The changing batches of printing ink are checked in respect of their substance composition by way of the measured absorption values.
<??>The burner adjustments (16) are likewise checked, e.g. via the CO band and fuel gas bands of the mixture.
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