Abstract: In carrying through quality management while printing a web on a rotational roller printing machine high accuracy is obtained by a periodic returning, simultaneous measuring of color density and spectral distribution in at least one selected point of the periodically returning printing pattern; the continuous registration and storing of the measuring results over the entire duration of the production process; an analysis of the measured results by predetermined criteria at least at the end of production. For doing so a device is provided with at least one adjustable measuring head spanning the width of the printed web, containing a spectrometer and a light source; the measuring head can be activated depending on the product by means of an encoder assigned to the rotational roller printing machine. Further, a control device is provided that can continuously record the measuring signals of each measuring head.

Abstract: In a remoistening device for remoistening a freshly printed and dried web of printed material has a housing through which the web of printed material runs. The remoistening device is a disposed downstream from a dryer, preferably in the area between the dryer and a cooling device. The remoistening device is provided with an inlet and outlet slot, in which spray nozzles, which are arranged above and underneath the conveyance plane of the web of printed material and which can be supplied with a moistening agent, are provided. It is possible to achieve a high degree of freedom from trouble and soiling is achieved in that drip catchers are arranged at the lower edges of the walls of the upper housing area of the remoistening device which cross an conveyance plane of the web of printed material.

Abstract: A device for cleaning the working surfaces of a printing press, in particular a blanket washing plant, with a plurality of washing units, preferably designed as washing bars, controlled by a central processing unit and provided with actuators and sensors is cost-effectively made safer, easier to in stall and to diagnose by a design characterised in that the central processing unit and each subset of washing units comprising at least one washing unit is assigned a communications module located at least near the washing unit, and in that all communications modules are connected to a transmission channel, via which signals can be transmitted and received.

Abstract: In the case of an apparatus for the contact-free application of a liquid strip, more particularly a strip of glue, on a moving web of material, comprising at least one application head, which is provided with at least one nozzle arranged at a distance from the web of material and a valve adapted to put the nozzle into and out of operation and adapted to be operated in accordance with the desired pattern of application, the aim of the invention is to provide such an improvement using simple and low-price means that despite the contact-free application of liquid high accuracy becomes possible. This accomplished by a modification such that the timing of the valve is modified to depart from the basic values, which are dependent on the application pattern, in accordance with a correction value which is a function of the speed of the web of material and at least the distance of the web from the nozzle.