Abstract: To prevent deformation to relatively stiffer sheets during flipping, while ensuring reliable holding of relatively weaker sheets, a method for stacking sheets received from a printer by a sheet flipping device includes at least one slot for receiving a leading portion of a sheet. The method includes determining a respective insertion depth parameter for a first and a second sheet, wherein the second sheet has a greater stiffness than the first sheet; inserting a length of the first sheet into the at least one slot in correspondence with its respective insertion depth parameter, followed by flipping said first sheet; inserting a length (D2) of the second sheet into the at least one slot in correspondence with its respective insertion depth parameter, followed by flipping said second sheet, wherein the inserted length of the first sheet is greater than that of the second sheet.

Abstract: A method of ink jet printing using an ink jet imaging device including a plurality of nozzles arranged for expelling droplets of an ink by actuation of an ink channel includes the steps of: a) providing a bit map of a spit pattern comprising an arrangement of refresh dots to be printed by each of the plurality of nozzles; and d) printing the bitmap of the spit pattern. The spit pattern includes a plurality of clusters of refresh dots, each cluster including at least two sequential refresh dots expelled from a single nozzle. A spit pattern for use in such a method is disclosed.

Abstract: When using a flipping wheel to flip sheets of weak or long media, there is a risk that these sheets collapse upon themselves. To reduce this risk, a method of stacking sheets includes flipping a sheet while holding its leading edge and bringing the leading edge down towards a stack support; bringing a trailing portion of the sheet into contact with a guide member positioned over the stack support; forming an overpressure in an inner volume of the bent sheet during flipping, while its trailing portion is in contact with the guide member; and maintaining the overpressure and contact while a trailing edge of the sheet travels along the guide member.

Abstract: The present invention relates to a print method. In the print method, a first layer of ink is deposited and cured before a second layer is applied. The present invention further relates to a software product. The present invention also relates to an inkjet printing apparatus.

Abstract: A method for processing a print job by a printing system and a finishing system resulting in an end product is disclosed. The printing system includes a print controller. The finishing system is an in-line or near-line finishing system and includes a finishing controller for controlling the finishing process by means of a collection of finishing templates stored in memory of the finishing controller. The printing system and the finishing system are connected via a digital connection.

Abstract: When duplex printing non-rectangular sheets of printable media, the sheets require proper registration to prevent misalignment of front and back images. This is ensured by: determining relative orientations of three different edges of a sheet being transported towards print station on a first pass; registering the sheet on the first pass by aligning one of the edges with respect to a predetermined alignment direction; printing a first image on a first side of the registered sheet; flipping the sheet on a second pass; registering the flipped sheet by aligning one of the edges with respect to a predetermined alignment direction; and printing a second image on a second side of the registered, flipped sheet aligned with the first image based on the determined relative orientations.

Abstract: In a method and device for ascertaining print data for a print image to be printed, the print data is adapted and/or determined such that the time curve of the ink flow quantity, exhibits no quantity changes or flow rates due to which ink ejection errors might be produced, in particular nozzle failures. The device includes: a communication interface configured to receive the print data; and processing circuitry that ascertains, based on the print data, a time curve of an ink flow quantity of ink that, during the printing of the print image, flows in the print bar and/or is ejected from the one or more nozzles of the print bar; and determine, based on the time curve of the ink flow quantity, whether an ink ejection error will be produced.

Abstract: A print method includes a) applying an activator composition onto a recording medium, the activator composition comprising a photoinitiator; b) applying an inkjet ink composition onto the recording medium, the inkjet ink composition comprising a curable monomer and a gellant, the inkjet ink composition comprising no photo initiator or comprising a photo initiator in an amount of 1.0 wt % or less, based on the total amount of the ink composition; and c) curing the ink and the activator composition. Step c is started within a time period of 2 s-1000 s after applying the ink composition onto the recording medium. an ink set comprising an activator composition and an inkjet ink composition, a software product, and an inkjet printing apparatus are also disclosed.

Abstract: An air fan assembly includes a suction box including a wall having an open area distributed across the wall. The suction box is configured to contain an underpressure on an inner side of the wall, so as to cause a cut sheet to adhere to a perforated transport belt. An impingement unit is configured to expel air supplied thereto towards the perforated transport belt. An air fan is arranged to create and maintain the underpressure in the suction box and to supply the air to be expelled by the impingement unit via an air outlet of the suction box. A first valve is arranged upstream of the air fan for conditionally admitting an additional air flow into the suction box. An inkjet printer and a method of operating the air fan assembly include the air fan assembly.

Abstract: The present invention relates to an aqueous reaction liquid composition including an anti-deforming agent. selected from the group consisting of a choline salt (formate, acetate, chloride), a guanidine salt (formate, acetate, chloride), trimethylglycine (betaine), potassium formate and ammonium nitrate. The present invention also relates to an aqueous reaction liquid composition including a Deep Eutectic Solvent (DES) having urea in combination with an anti-deforming agent as disclosed above. In another aspect the invention relates to an ink set including such aqueous reaction liquid composition and an ink composition, preferably a pigmented ink composition. In another aspect the present invention relates to a printing method including application of an aqueous reaction liquid composition according to the present invention and application of an ink composition.

Abstract: An arrangement for supplying ink to a print bar with small pressure fluctuations may include an ink reservoir and a damping vessel. The print bar may include at least two print heads and is connected with the ink reservoir via a supply line. Each of the print heads is connected with the damping vessel via at least one damping line. The damping vessel is connected with a discharge line. The end of the damping line ends at a first height in the damping vessel. The end of the discharge line ends at a second height above the first height in the damping vessel. The arrangement may supply ink to the print bar with small gas fraction in the ink.

Abstract: In the print data for a nozzle of a printer, white dots are replaced by pre-ejection pulses. One or more repetitions of the pre-ejection pulses may be inserted into the print data, depending on the actual print speed of the printer, to determine print speed-dependent print data with which the nozzle is activated to print a print image with high print quality.

Abstract: To ensure reliable and productive processing of printed sheets into stacks, a sheet stacker includes: a flipping device for flipping a sheet with respect to the sheet's orientation before being received by the flipping device onto a stack support or a stack of sheets on the stack support; a sensor assembly for detecting an out-of-plane deformation of a top sheet with respect to the underlying stack support or a stack of sheets on the stack support at least for each sheet added to the stack; and a controller configured to determine from data from the sensor assembly whether the top sheet was successfully flipped and stacked.

Abstract: In a method and a printing device for influencing an optical property of a varnish layer to be applied onto a printed recording medium, a coating substance is applied onto the recording medium by digital printing before the printing of at least one color separation of the print image on said recording medium. The quantity of the coating substance applied per area unit may be adjusted depending on the desired optical property of the varnish layer to be applied later.

Abstract: A dryer system is described that is configured to purify, by means of a wet scrubber, the exhaust gases created in the drying of a recording medium that has been printed to. Moreover, thermal energy may be extracted from the exhaust gases in the wet scrubber, which thermal energy is used in turn to dry the recording medium. An environmentally safe and energy-efficient drying may thus be enabled.

Abstract: A liquid jetting device is arranged to eject a droplet of a liquid. The device includes a nozzle, a liquid duct connected to the nozzle, an electro-mechanical transducer arranged to create an acoustic pressure wave in the liquid in the duct, and an electronic control system arranged to apply to the transducer a voltage signal having a waveform configured for ejecting a droplet from the nozzle. The waveform is further configured to quench a residual acoustic pressure wave in the liquid duct and includes a jet pulse, a subsequent first quench pulse having a polarity opposite to that of the jet pulse, and a subsequent second quench pulse having the same polarity as the jet pulse.

Abstract: A fixation unit for use in a printing apparatus includes a substantially closed box for enclosing a heated space, the substantially closed box including an entry opening and an exit opening for enabling transport of a print substrate through the substantially closed box, a heating element arranged for heating the heated space enclosed by the substantially closed box, and a transport mechanism for engaging a sheet of the print substrate from the entry opening to the exit opening of the substantially closed box. The transport mechanism includes a nip of two belts that are pressed together and run concurrently and in the same direction, the belts being impermeable to any ink component. A printer includes such a fixation unit and a printing method uses such a fixation unit.

Abstract: A printing module includes a first imaging device and a slot for accommodating an optional second imaging device. An ink supply module includes a slot for accommodating an optional drying/fixation apparatus, and a second ink supply device. Also, the ink supply module and the printing module include ink inlet/outlet ports such that the optional second imaging device in the printing module, if present, can be supplied ink from the second ink supply in the ink supply module when the printing module and the ink supply module are combined to form a printer.

Abstract: The invention relates to an ink jet printer having a print carriage, a curing unit and a holder arranged to move a recording medium relative to the carriage assembly in a sub-scanning direction, wherein the print carriage is movable in a main scanning direction normal to the sub-scanning direction, and a print head unit arranged on the print carriage for printing a swath of an image onto the recording medium in each scan pass of the print carriage, the print carriage further having a mirror assembly arranged to deflect light from the curing unit onto an exposure area on the printed swath.

Abstract: During flipping sheets may fold upon themselves under the influence of gravity. To prevent a sheet stacker is provided with a support device for supporting an inner surface of the sheet during flipping, the support device comprising a plurality of flexible fingers elements of different length, each configured to support a different inner area of the sheet during its flipping motion.