Abstract: A microwave device 2 is provided for fusing toner onto a print substrate in a printing machine, with a device for generating a synchronized operation to increase the absorption of the microwave irradiation by the print substrate. The microwave energy is provided by the microwave device to the print substrate in the form of pulses and the absorption of the microwave radiation by the print substrate is increased.

Abstract: A fusing device complemented by a microwave application.

Abstract: A process or device for fusing toner on a carrier or a printing material, particularly a sheet-type printing material, preferably for a digital printer, wherein the printing material with the toner is irradiated with microwaves from at least one microwave conductor, which is heated to melt the toner and a toner is used which shows a sharp drop of the elastic modulus G′ from its hard state to its liquid state when heated. The ratio of the value of the elastic modulus G′ of the toner is the reference temperature value calculated from the initial temperature at the beginning of the glass transition of the toner plus 50° C. to the value of the elastic modulus G′ at the initial temperature is <10−5.

Abstract: A device and process for fixing a toner onto a substrate or a printed material, especially a sheet-shaped printed material, preferably for a digital printer, which is characterized in that the printed material that has the toner is irradiated with microwaves from at least one microwave emitter, and is heated to melt the toner, and that a toner is used which exhibits a sharp drop of the modulus of elasticity G′ from its solid to its liquid state when it is heated. Preferably, the ratio of the value of the modulus of elasticity G′ of the toner according to the invention at the reference temperature value, calculated from the starting temperature at the beginning of the glass transformation of the toner plus 50° C., to the value of the modulus of elasticity G′ at the starting temperature itself is <10−5.

Abstract: A digital printer or copier machine (1) and a device (23) for protection against excessive heating of an object (5, 49), for example, a paper to be printed, that is guided past a radiation device (7) within a digital printer or copier machine (1). The protection device (23) has two protection elements (41, 43) permeable to radiation and arranged at a distance from each other, which are arranged in the radiation path (21) between a radiation device (7) and the object to be heated (5, 49).

Abstract: A fixation device for fixation of toner material on a printing stock for an electrophotographic printer with a radiation wavelength essentially in the ultraviolet range for thermal melting of the toner material, and the stock, as carrier of the toner material, is heatable by a device essentially during the exposure process.

Abstract: A digital image recording device (1), especially an electrographic or electrophotographic printing or copying machine, and a process for controlling the gloss of a toner image which has been transferred to an image carrier substrate (9) and fixed are proposed. In the process, after the toner image has been fixed on the image carrier substrate (9) by heating, as much heat is supplied to the toner image at least once again that the toner image on its surface or in the area near its surface is melted either completely or at least in areas, the degree and/or the duration of melting being set depending on the desired gloss of the toner image.

Abstract: A machine for application and fixation of curable toner through a substrate and a method for printing and/or coating a substrate, especially paper or cardboard. The method includes the use of at least one curable toner in which at least one toner layer or at least one image having a toner layer is transferred to the substrate and fixed on it, the toner being a UV curable toner having at least one polymer that is exposed to UV (ultraviolet) radiation for crosslinking of its polymer chain. The degree of melting of the toner layer being fixed being controlled as a function of the desired luster.

Abstract: A digital printing or copying machine (1), and a process which can be carried out with it, for one-sided or double-sided printing of a substrate (5) using at least one toner are proposed. The machine (1) includes at least one fixing device (3) for fixing of a toner image (29) on the substrate (5), having at least one heater (21, 23) for melting the toner image (29), past which the substrate (5) can be guided by a transport device (11) which has one or more transport elements (29, 63 to 71). The machine (1) is characterized in that the heater (21, 23) has at least two melt areas (31, 33, 43 to 47) on the substrate (5) which viewed in the substrate transport direction (15) are arranged in succession and laterally offset to one another.

Abstract: A radiation unit for a fixation device for fixation of toner material on a printing stock surface for an electrophotographic printing machine, as well as a method for exposure and fixation of toner material on a printing stock surface. Exposure for fixation of toner material occurs essentially indirectly, i.e., the light emitted by the radiation unit is reflected at least once, so that high uniformity and homogeneity of the radiation, efficient energy utilization and avoidance of adverse changes on the printing stock are achieved. A high-energy density, low housing dimensions and independence of the radiation from the employed printing unit are achieved by the fact that the radiation wavelength lies essentially in the ultraviolet spectral range.

Abstract: A digital image recording device and a method wherein a color toner image (11) is initially transferred to an image carrier substrate (1) and then melted and fixed by exposure to electromagnetic radiation on the image carrier substrate (1). The method is characterized by the toner layers (5, 7, 9), having different colors, being melted in succession, toner image (11) being exposed repeatedly to electromagnetic radiation with different wavelength ranges, and that the corresponding wavelength range being chosen so that one color absorbs most of this electromagnetic radiation.

Abstract: Digital printers or copier machines (1) and processes to be performed using them, for fixing a toner image (5) transferred onto an image-carrier substrate (9), are proposed. One of the processes is characterized in that to fuse the toner particles, at least two electromagnetic radiation pulses are applied in a time-delayed manner onto the same area of the image-carrier substrate (9) and each one individual radiation pulse being in a range from 0.5 J/cm2 to 5 J/cm2.

Abstract: A process is proposed for the double-sided printing and/or coating of a substrate using at least one liquid or dry toner that has at least one polymer. It is provided that at least one toner layer or a first image that has at least one toner layer is transferred onto a first side of the substrate. Then, the toner is heated up to at least its glass transformation temperature, and fixed onto the substrate. In the process, the original glass transformation point of the toner shifts to a higher temperature level as a result of the cross-linking of its polymer chains, and the viscosity is increased. In a second processing step, at least one toner layer or a second image is transferred onto the second side of the substrate and heated up to a temperature that is equal to or greater than its glass transformation temperature.

Abstract: A process and device for fusing toner onto a carrier or a print substrate, in particular a sheet-like print substrate, preferably for a digital printing machine, wherein the toner bearing print substrate is heated by microwaves emanating from at least one microwave emitter in order to melt the toner, and wherein a toner is used that demonstrates a sharp drop-off in the elastic module G′ from its solid to its liquid state upon heating. The ratio of the elastic module G′ of the toner at the reference temperature, calculated from the initial temperature at the start of the glass transition of the toner plus 50° C., to the value of the elastic module G′ at the initial temperature itself is preferably <10−5.

Abstract: A digital printing or copying machine (1) is proposed for the one-sided or double-sided printing onto a substrate (5), using at least one toner. The machine (1) includes at least one fixation device (3) for fixing the toner image on the substrate (5). The fixation device (3) has at least one heating device (13) for melting the toner image, past which the substrate (5) can be taken. The machine (1) is distinguished by a guide device (17) for the free floating movement of the substrate (5) in the effective range of the heating device (13).

Abstract: A digital printing or copying machine (1), and a process which can be carried out with it, for one-sided or double-sided printing of a substrate (5) using at least one toner are proposed. The machine (1) includes at least one fixing device (3) for fixing of a toner image (29) on the substrate (5), having at least one heater (21, 23) for melting the toner image (29), past which the substrate (5) can be guided by a transport device (11) which has one or more transport elements (29, 63 to 71). The machine (1) is characterized in that the heater (21, 23) has at least two melt areas (31, 33, 43 to 47) on the substrate (5) which viewed in the substrate transport direction (15) are arranged in succession and laterally offset to one another.

Abstract: A process is proposed for the double-sided printing and/or coating of a substrate using at least one liquid or dry toner that has at least one polymer. It is provided that at least one toner layer or a first image that has at least one toner layer is transferred onto a first side of the substrate. Then, the toner is heated up to at least its glass transformation temperature, and fixed onto the substrate. In the process, the original glass transformation point of the toner shifts to a higher temperature level as a result of the cross-linking of its polymer chains, and the viscosity is increased. In a second processing step, at least one toner layer or a second image is transferred onto the second side of the substrate and heated up to a temperature that is equal to or greater than its glass transformation temperature.

Abstract: A digital printer or copier machine (1) is proposed for the single-sided or double-sided printing of a substrate (11), with at least one fixing device (3) for fixing toner onto the substrate (11), whereby the fixing device (3) has at least one heating device for fusing the toner. The machine has, in addition, at least one transport device (17), in order to supply the substrate (11) to the heating device, to guide it past the heating device and/or to further transport it from the heating device, whereby the transport device (17) has at least one suction belt (19) that is provided with a number of through-passage openings (21) and can be impinged with a vacuum. The machine (1) is characterized in that the suction belt (19) is constructed as a mesh.

Abstract: Digital printers or copier machines (1) and processes to be performed using them, for fixing a toner image (5) transferred onto an image-carrier substrate (9), are proposed. One of the processes is characterized in that to fuse the toner particles, at least two electromagnetic radiation pulses are applied in a time-delayed manner onto the same area of the image-carrier substrate (9).

Abstract: A digital image recording device and a method wherein a color toner image (11) is initially transferred to an image carrier substrate (1) and then melted and fixed by exposure to electromagnetic radiation on the image carrier substrate (1). The method is characterized by the toner layers (5, 7, 9), having different colors, being melted in succession, toner image (11) being exposed repeatedly to electromagnetic radiation with different wavelength ranges, and that the corresponding wavelength range being chosen so that one color absorbs most of this electromagnetic radiation.