Abstract: In a method of drying inks which are printed on to a paper web in the printing mechanisms of a rotary intaglio printing machine and which are diluted by means of a solvent. the paper web, downstream of each printing mechanism, passes through a drier having a substantially closed housing through which flows a gas which serves to pick up and carry away the solvent. To achieve a reduction in the residual solvent concentration in the finished printed product in spite of an increased speed of the paper web, the drying gas used in at least one of the driers is an inert gas, the through-put thereof through the drier being so selected that a solvent concentration which is very high in comparison with drying with air occurs in the drier.

Abstract: A rotary intaglio printing machine has at least two printing mechanisms and a drying device arranged between the printing mechanisms, through which a web of paper to be printed upon successively passes. The printing mechanisms are so arranged that the web of paper is guided only by the plate cylinders and the impression cylinders of the printing mechanisms in a straight line from the preceding printing mechanism through the drying device in a contact-free mode to the following printing mechanism. The drying apparatus includes a housing through which the web of paper passes, as well as a fan arrangement and nozzle pipes which extend transversely to the direction of movement of the web of paper substantially over the entire width thereof and by which air, that is sucked out of the housing by the fan arrangement, is blown onto the web of paper.

Abstract: In a process and installation for removing solvent vapor from exhaust air sucked from a working space, the air is fed to at least two parallel activated carbon adsorbers. Each adsorber can be switched to and fro between a charging mode in which it adsorbs solvent vapors from the exhaust air flowing through the adsorber, and a regeneration mode in which it is separated from the flow of exhaust air and flushed with water vapor and desorbed. To save energy and to reduce environmental pollution, at the end of the regeneration period each adsorber has a drying phase in which exhaust air from the working space flows through the adsorber, the air thereafter being fed to an adsorber which is operating in the charging mode.