Esko-graphics Imaging Gmbh

Klaus Walter Arlt

Wolfgang Sievers

A source of actinic radiation for curing printing plates. The source includes a base with a heat sink and has a length greater than its width. One or more circuit boards mounted on the base provide a plurality of light emitting diodes (LEDs) distributed over the length of the base. A transparent or translucent cover together with the base defines an enclosure for the plurality of LEDs. The source provides the radiation at an emission angle greater than the emission angles of a single LED in a plane perpendicular to the axis of the base, in a plane containing the axis of the base or parallel to the axis of the base and perpendicular to the target illumination plane, or a combination thereof. The source may be configured to replace a fluorescent bulb. Methods and systems for bank exposure of printing plates using such sources are also described.

UV LED radiation sources for use in photopolymer exposure

A combined radiation and functional layer application system includes one or more radiation sources and a commonly located functional layer application unit configured to dispose a functional layer over the surface of a fixed target ahead of the radiation sources during relative motion between the target and the radiation sources/application unit. System and method embodiments include those in which the target is stationary or moving, and embodiments in which the functional layer is applied as a liquid or as a solid laminate. Embodiments relate to application of an oxygen-blocking layer of a printing plate prior to exposure to actinic radiation. Certain solid laminate embodiments include a two-roll system for positioning the laminate for cutting adjacent a trailing edge of the plate.

Systems and methods for combined radiation and functional layer application

A method and apparatus for measurement of density of a photosensitive printing plate () having a mask () embodying image information corresponding to an image to be printed. A density measurement system includes a first radiation source () spaced apart from and adjacent the plate and configured to emit radiation having a first wavelength or range of wavelengths toward the plate. A densitometer () spaced apart from and adjacent the plate in a fixed relationship relative to the first radiation source receives and measures an amount of the first radiation transmitted through or reflected by the plate and the mask during relative movement between the plate and the density measurement system. The densitometer readings are processed to provide an output correlating to quality of the mask. The density measurement system may be coupled to an exposure system () for curing the plate.

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Itzehoe, Germany

Klaus Walter Arlt