Abstract: A digital inkjet printing method capable of imparting a transparent color to a UV-curable transparent ink includes: on multiple color ink inkjet heads and a transparent ink inkjet head, setting a first output area and a second output area, respectively; controlling at least one color ink inkjet head to output from the first output area a color ink corresponding to the first output area in a first printing stroke, and at the same time of the output, so as to form a pattern area; and at a partial position, where a transparent effect is to be formed, on the pattern area, simultaneously controlling at least one color ink inkjet head and the transparent ink inkjet head to simultaneously output from the second output area a color ink and a transparent ink corresponding to the second output area in a second printing stroke.

Abstract: A detecting method for printing material boundary of a large UV inkjet printer includes steps of performing a full-field scanning process at a first scanning speed by a photosensitive element disposed on an inkjet module to cause a sensing device to produce induced voltage signals corresponding to different positions below sequentially in order to determine rough coordinate positions of two opposite sides of the printing material based on the changes of the induced voltage signals, and to define detailed scanning areas including the rough coordinate positions of the two opposite sides; and performing a detailed scanning process for the detailed scanning areas along an opposite direction at a second scanning speed slower than the first scanning speed by the photosensitive element in order to obtain boundary coordinate positions of the two opposite sides of the printing material based on the changes of the induced voltage signals.

Abstract: A detecting method for printing material boundary of a large UV inkjet printer includes steps of performing a full-field scanning process at a first scanning speed by a photosensitive element disposed on an inkjet module to cause a sensing device to produce induced voltage signals corresponding to different positions below sequentially in order to determine rough coordinate positions of two opposite sides of the printing material based on the changes of the induced voltage signals, and to define detailed scanning areas including the rough coordinate positions of the two opposite sides; and performing a detailed scanning process for the detailed scanning areas along an opposite direction at a second scanning speed slower than the first scanning speed by the photosensitive element in order to obtain boundary coordinate positions of the two opposite sides of the printing material based on the changes of the induced voltage signals.

Abstract: A method for printing on a shiny surface by a UV inkjet printer with transparency and high color density is described. Steps of the method include: (a) according to a conveying direction of a workpiece, dividing the workpiece with a reflective film into a plurality of continuous printing areas; (b) performing a printing operation on each printing area of the reflective film of the workpiece for at least three times; and (c) turning on a UV lamp at one side of an inkjet module when a final printing operation is performed on each printing area, to cure ink jetted from the inkjet module, thereby enabling the reflective film of the workpiece to still retain high shininess and high transparency after printing of the workpiece with a transparent reflective film surface is completed, and enabling a pattern printed thereon to have high color density.

Abstract: A method for printing on a shiny surface by a UV inkjet printer with transparency and high color density is described. Steps of the method include: (a) according to a conveying direction of a workpiece, dividing the workpiece with a reflective film into a plurality of continuous printing areas; (b) performing a printing operation on each printing area of the reflective film of the workpiece for at least three times; and (c) turning on a UV lamp at one side of an inkjet module when a final printing operation is performed on each printing area, to cure ink jetted from the inkjet module, thereby enabling the reflective film of the workpiece to still retain high shininess and high transparency after printing of the workpiece with a transparent reflective film surface is completed, and enabling a pattern printed thereon to have high color density.