Offset printing method and device

Abstract

Disclosed is an offset printing device in which a printing-plate table (4) and a base-plate table (6) are movably provided on a guide rail (2) which is provided on a stand (1). A transfer mechanism (9) is provided at a location on the guide rail (2) corresponding to an intermediate section thereof in the longitudinal direction, the transfer mechanism (9) comprising: a blanket roll (10); a blanket roll raising / lowering actuator (13); a blanket roll height sensor (14); and a pressure sensor (15) for detecting the contact pressure of the blanket roll with respect to a printing plate (3) or a base plate (5). Furthermore, a controller controls the raising / lowering actuator (13) in such a way that the contact pressure detected by the pressure sensor (15) when the blanket roll (10) contacts the printing plate (3) or the base plate (5) reaches a prescribed value. The contact pressure when transfer is performed from the printing plate (3) to the blanket roll (10) and the contact pressure when re-transfer is performed from the blanket roll (10) to the base plate (5) are both made uniform, whereby the amount of deformation of the portion which contacts the printing plate (3) or the base plate (5) is made uniform and the peripheral speeds are made equal. As a result, the printing precision can be improved.

Description

technical field [0001] The present invention relates to an offset printing method and apparatus used for finely printing an object to be printed with high printing accuracy when forming an electrode pattern on a substrate by printing. [0002] this application claims priority based on Japanese Patent Application No. 2009-208717 for which it applied to Japan on September 9, 2009, and uses the content here. Background technique [0003] As one of the printing techniques, there is offset printing, and among them, offset printing using gravure is widely known as a method in which ink is temporarily transferred (received) from an inked gravure to a rotating rubber roller, and then Retransfer (printing) of the ink from the squeegee to the printing object enables the above-mentioned intaglio printing pattern to be printed on the surface of the printing object with good reproducibility. [0004] In addition, in recent years, as a method of forming an electrode pattern (conductive p...

AI Technical Summary

Problems solved by technology

However, it does not disclose any idea of ​​keeping the contact pressure of the roller to the plate and the contact pressure of the roller to each substrate whose thickness dimension is not necessarily constant.

Therefore, in the method disclosed in Patent Document 4, the possibility of a difference in the contact pressure between the cylinder and the plate or the substrate as mentioned above cannot be eliminated.

Moreover, the following problems cannot be eliminated: because of the difference in contact pressure when the roller contacts the plate or the substrate, there is a difference in the amount of change in the roll diameter of the contact portion between the roller and the plate or each substrate, and the peripheral speed of the contact portion changes. , so that the printing accuracy and reproducibility of each substrate are reduced

However, it is impractical to use plates or printing objects that are exposed from the rubber roller to the outside in the direction of the roller axis.

[0032] Furthermore, even if the planar plate or printing object is exposed from the squeegee to the outside in the direction of the roller axis and the thickness change of the exposed portion is measured, it is impossible to detect the difference between the flat plate or the printing object and the squeegee roller from the measurement results. Thickness change in the roll axis direction of the contact part

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