The invention relates to a drying unit (22) for drying printed substrates (21), comprising a chamber (23) with a gaseous medium which is oxygen-reduced by means of an inert gas, wherein the substrates (21) are guided through the chamber (23) or at least can be guided through the chamber, and the chamber (23) has an entrance for the substrates (21) to be guided into the chamber (23) in the transport direction (T) of the substrates (21). The entrance for the substrates (21) to be guided into the chamber (23) is formed by two cylinders (04; 06) which are positioned against each other longitudinally. The cylinders (04; 06) positioned against each other at the entrance of the chamber (23) form a printing unit (03). One of the cylinders (04) is designed as a printing cylinder (04), and the other cylinder (06) is designed as a cylinder (06) which interacts with the printing cylinder (04) and applies a printed image onto the affected substrates (21). The two cylinders (04; 06) which are positioned against each other under pressure at the entrance of the chamber (23) form a seal which runs axially to the cylinders (04; 06) for preventing the oxygen-reduced gaseous medium from leaking out of the chamber (23) and/or for preventing oxygen from the ambient air from entering the chamber (23). The printing unit (03) arranged at the entrance of the chamber (23) is designed as a printing unit (03) for an intaglio printing process.

Disclosed is a drum printing apparatus including: a vacuum drum rotatably supported and coupled to a base and including a drum body shaped like a drum a printing head unit configured to form a set image including a text and a picture in the vacuum drum; a clamping unit configured to perform unclamping for mounting paper from a paper feeder to the drum body and clamping for holding and pressing paper to the drum body; and a cam unit coupled to the base and configured to operate being interlocked with the clamping unit, the clamping unit including a clamping knife coupled to a knife rotating-shaft and configured to be rotatable between a clamping position for pressing paper and an unclamping position for separating from paper, and a pair of clamping brackets coupled to opposite ends of the knife rotating-shaft and configured to be interlocked with the cam unit.

A sheet-fed printing unit has a first impression cylinder and a second impression cylinder, which are arranged directly and interactingly in contact and which each have an axis of rotation. An axial plane contains the axes of rotation. A reference plane is a plane which contains an axis of rotation of a cylinder of this type and has a horizontal surface normal. These two cylinders are arranged such that an intersection angle between the axial plane and the reference plane is a maximum of 15°. A transport path is provided for a transportation of sheets, which transport path has a region for the respective impression cylinder in which there is contact between sheets and a casing surface. This region of the transport path for the respective impression cylinder extends over an angular range of at least 270°. A sheet-fed printing machine has a sheet-fed printing unit of this type.

An active energy radiation unit includes a light source which radiates ultraviolet rays onto a target object, and a main gas supply mechanism which is disposed to be adjacent to the light source and ejects an inert gas. The main gas supply mechanism includes a receiving part which receives nitrogen gas, a first ejection port which is provided at a position between the receiving part and the light source in a transfer direction and closer to the target object than the receiving part and a second ejection port which is provided between the receiving part and the first ejection port in the transfer direction.

According to aspects of the embodiments, there is provided a method of measuring the amount of fountain solution employed in a digital offset lithography printing system. Fountain solution thickness is measured using a glass roll at a lower temperature than the fountain solution. The lower temperature causes the fountain solution to undergo a change in state and in a solid state the fountain solution crystalizes and changes roll opacity with the thickness of the film. When radiated with a light source the opacity is continuously measured through the surface of the roller. The thickness of the crystallized fountain solution can then be determined via the opacity level increase by the crystallization and the impact to the opacity on the glass roll.

A curing station for curing printing ink of a direct print on containers, comprising a conveyor for conveying the containers preferably in container holders, and further comprising at least one UV light unit for curing the printing ink, characterized in that the at least one UV light unit comprises a 2D arrangement of UV LEDs for generating a UV light field for curing the printing ink.

The present invention relates to a method for controlling the curing degree of at least one at least partially cured ink and/or varnish printed on a substrate, which comprises cutting at least one sample from an area of the printed substrate, placing and incubating it in a solvent, in which at least one of the at least one extractable compound is soluble, and removing it from the solvent to obtain a solvent extract; quantitatively measuring a spectroscopic characteristic of the solvent extract; comparing the measured numeric value of the spectroscopic characteristic with a reference value of the spectroscopic characteristic for the same area of the printed substrate; and outputting a result, wherein the reference value of the spectroscopic characteristic for the same area of the printed substrate has been obtained by the use of an empirical model.

A method produces a printed product. The method includes transferring a first Fluid onto at least one section of printing stock, applying a second fluid, having a dewetting effect on the first fluid, onto a form configured as a relief printing form or embossing form, and transferring the second fluid to at least some points of the section. In this manner printed products of high quality can be produced.

An LED light device can be securely engaged on one of its ends with a docking port that includes electrical and coolant fluid fittings for the LED light device. The docking port can include a connection body, a plurality of fittings disposed on a common side of the connection body, a release lever and a guide rail. The plurality of fittings can include a first fitting configured to mate with the electrical fitting of the LED light device and a second fitting configured to mate with the first coolant fitting of the LED light device. The guide rail can extend forwardly from the connection body away from the common side of the connection body. The guide rail can slide in a channel defined in a sidewall of the LED light device. The release lever can be moved between a locked position and an unlocked position.

A system and method for determining when an emulsion or screen is properly cared including a light sensor located on an opposing side of the screen or emulsion from an LED light source operating in at least one wavelength in the ultraviolet range and a sensor monitor that that receives signals from the light sensor and determines the amount of light passing through the emulsion. When the amount of light passing through the emulsion reaches a minimum or approximates zero the sensor monitor may optionally deactivate the LED light source.