Search

CN-118574730-B - Printing machine for producing security documents

CN118574730BCN 118574730 BCN118574730 BCN 118574730BCN-118574730-B

Abstract

The invention relates to a printing press for producing a security document (02), wherein an impression cylinder (42) of a substrate (26) for guiding the security document (02) and a transfer cylinder (43) which is associated with the impression cylinder (42) at a transfer point and prints a print image (27) onto the substrate (26) are provided, wherein the substrate (26) of the security document (02) has at least one transparent window (04), at least in the region of the relevant transparent window (04) on one side of the substrate (26) is provided with a micro-optical structure (03) formed by micro-lenses (11), the impression cylinder (42) and the transfer cylinder (43) being arranged in such a way that at least in the region of the relevant transparent window (04) on one side of the substrate (26) is provided with a micro-optical structure (03) formed by micro-lenses (11), and at least in the region of the relevant transparent window (04) on the other side of the substrate (26) opposite to the micro-optical structure (03) is provided with at least one printed image (27) in the form of a dot-like pattern (28 a) representing a dot-like pattern (28 j) of the relevant dot-pattern (27, 28a-28j, respectively A printing device for inking a layer (39) which extends in a planar manner and covers the relevant printing pattern (27) is provided on the side opposite the micro-optical structure (03), said printing device being designed as at least one inkjet printing head (46) and downstream of a transfer point of the transfer cylinder (43) for printing the printing pattern (27) onto a substrate (26) guided by the impression cylinder (42), said printing device being arranged on the same side of the substrate (26) as the printing pattern (27) produced on the transfer point, wherein the layer (39) formed by the at least one inkjet printing head (46) is formed of a lighter shade than the shade which forms the relevant printing pattern (27) and is different from white.

Inventors

  • Arnold Krasus
  • ROBERT STEWART
  • ROBERT STILLMAN

Assignees

  • 柯尼格及包尔公开股份有限公司

Dates

Publication Date
20260505
Application Date
20230406
Priority Date
20220505

Claims (11)

  1. 1. A printer for producing security documents (02), wherein an impression cylinder (42) of a substrate (26) guiding the security documents (02) and a transfer cylinder (43) which is associated with the impression cylinder (42) on a transfer point and prints a printing pattern (27) onto the substrate (26) are provided, wherein the substrate (26) of the security documents (02) has at least one transparent window (04), at least in the region of the respective transparent window (04) on one side of the substrate (26) is provided with micro-optical structures (03) composed of micro lenses (11), wherein the impression cylinder (42) and the transfer cylinder (43) are arranged in such a way that at least in the region of the respective transparent window (04) on one side of the substrate (26) a micro-optical structure (03) composed of micro lenses (11) is arranged, and at least in the region of the respective transparent window (04) on the other side of the substrate (26) opposite to the micro-optical structure (03) at least one of the printing patterns (28) is arranged in a pattern of dots (28, wherein the printing pattern (28) is different from the pattern (28, 28) of dots (28, 28-28, respectively, printing device for inking a layer (39) extending in a planar manner and covering the respective printing pattern (27) on at least a part of the respective printing pattern (27) on the side of the respective printing pattern opposite to the micro-optical structure (03), wherein the printing device is designed as at least one inkjet print head (46) downstream of the transfer point at which the printing pattern (27) is printed onto the substrate (26) guided by the impression cylinder (42) on the transfer cylinder (43), is arranged on the same side of the substrate (26) as the printing pattern (27) produced on the transfer point, and is designed in such a way that the layer (39) formed by the printing device is composed of a lighter tone than the tone different from white that constituting the respective printing pattern (27), characterized in that the printing device arranged downstream of the transfer point at which the printing pattern (27) is printed onto the substrate (26) guided by the impression cylinder (42), wherein the at least one inkjet print head (46) is designed in such a way that the micro-optical layer (39) is formed by the impression cylinder (47) is composed of the micro-optical structure (47), and the embossing mechanism is arranged in such a way that it forms micro-optical structures (03) composed of micro-lenses (11) on a substrate (26) guided by an embossing cylinder (42) during rotation of the embossing cylinder (42), wherein the embossing mechanism (47) is designed to produce the micro-lenses (11) using a die casting method.
  2. 2. Printer according to claim 1, characterized in that the respective printed image (27) has graphic elements (28 a-28 j) consisting of at least two different hues, wherein the layer (39) formed by said at least one inkjet print head (46) consists of a lighter hue than each hue constituting the respective printed image (27).
  3. 3. Printer according to claim 1 or 2, characterized in that the pixel size (38) or the line thickness (38) of the picture elements (28 a-28 j) of the respective printed picture (27) is designed to be smaller than the lens width (18) of the micro lenses (11) arranged in the micro-optical structure (03), respectively.
  4. 4. Printing machine according to claim 1 or 2, characterized in that at least two plate cylinders (44) are provided which rest or at least can rest on the circumference of the transfer cylinder (43), wherein each of the plate cylinders (44) transfers printing ink constituting a respective printing pattern (27) to the transfer cylinder (43), wherein the transfer cylinder (43) collects the printing inks of different hues and is designed such that the printing ink collected on the transfer cylinder (43) is transferred together onto a substrate (26) guided by an impression cylinder (42).
  5. 5. Printer according to claim 1 or 2, characterised in that the embossing mechanism (47) and a transfer cylinder (43) which cooperates with the embossing cylinder (42) at a transfer point for printing a print image (27) onto the substrate (26) are arranged in the printer in such a way that the arrangement of the micro-optical structures (03) formed by micro-lenses (11) and the arrangement of at least one print image (27) to be arranged in the region of the transparent window (04) are performed simultaneously.
  6. 6. The printing press according to claim 1 or 2, characterized in that the embossing mechanism (47) and a transfer cylinder (43) which cooperates with the embossing cylinder (42) at a transfer point and prints a print image (27) onto the substrate (26) are arranged in the printing press in such a way that the arrangement of the micro-optical structures (03) formed by the micro-lenses (11) and the arrangement of at least one print image (27) to be arranged in the region of the transparent window (04) are performed with a time offset.
  7. 7. Printer according to claim 1 or 2, characterized in that the embossing mechanism (47) is designed such that it forms microlenses (11) made of synthetic material.
  8. 8. Printer according to claim 1 or 2, characterised in that the embossing mechanism (47) is designed such that it forms microlenses (11) made of resin.
  9. 9. Printer according to claim 1 or 2, characterized in that the substrate (26) is designed as a web or sheet of printing material.
  10. 10. Printer according to claim 1 or 2, characterized in that the substrate (26) is designed as a polymer film or is made of paper.
  11. 11. Printer according to claim 1 or 2, characterized in that the printer is designed as a rotary printer for the printing of securities.

Description

Printing machine for producing security documents Technical Field The present invention relates to a printing press for producing security documents according to claim 1. Background A method for forming a structure of micro-graphic elements is known from US2021/0206192A1, which micro-graphic elements are variable in their material composition, comprising the steps of applying a first region of a layer made of a first material to a surface of a first material carrier, applying a second region of a layer made of a second material different from the first material to a surface of a second material carrier, mixing the first region and the second region of the layer of the first material and the second material such that the mixing region of the layer of the first and the second material exhibits a gradual change in the relative concentration of the first material and the second material in a first direction, the step of mixing the first region and the second region of the layer of the first material and the second material comprising bringing the first mixing surface into contact with the first material on the surface of the first material carrier, and bringing the first mixing surface into contact with the first material in a direction corresponding to the first direction with respect to the surface of the first material carrier, bringing the first mixing surface into contact with the pattern of the first material in a pattern corresponding to the first material of the second material carrier, bringing the mixing region into contact with the second region of the first material in a pattern in the first direction corresponding to the first direction with the second material carrier, bringing the mixing region into contact with the first region of the first material and the second material in the second material carrier in a pattern corresponding to the first direction, the patterned material carrier selectively removes the first and second materials according to a pattern at least in the mixing region, and transfers a mixed layer of the first and second materials defining the array of micro-elements onto the carrier layer. A method for producing a security device is disclosed by EP2493700A2, which method comprises providing an arrangement of lenticular focusing elements on one side of a transparent substrate and providing a corresponding arrangement of groups of graphics strips on the other side of the transparent substrate, the graphics strips and lenticular focusing elements defining a lenticular device such that respective graphics strips from each group are viewed through respective lenticular focusing elements in different viewing directions. A method for producing a security element or security document is known from DE102017218800B3, in which the security element or security document has a structure of a plurality of microlenses, respectively, which form an optical imaging structure in the form of a geometric pattern, wherein a first subset of the microlenses, which are arranged on the geometric surface, are arranged in a grid consisting of grid cells, the microlenses, which are arranged in the grid, respectively, being rotationally symmetrical in a spherical or rotationally symmetrical manner in an aspherical manner, wherein a second subset of the microlenses, which belong to the associated optical imaging structure, which are arranged in the plane of the same geometric pattern, are arranged in at least one lens grid having a plurality of microlenses, each having a rod-like design, which are each axisymmetrically printed in a plurality of sub-printed patterns superimposed on one another simultaneously on a first side and/or at the same print location, and the optical imaging structure comprising the microlenses is applied in-line by a spraying device on the same or on the other side of the substrate. A security document is known from WO2011/107783A1 comprising a document substrate having at least two transparent or see-through windows spaced apart from each other and means comprising a transparent substrate carrying i) a uniform arrangement of micro-focus elements on a first surface, wherein the focus elements define a focal plane, ii) a respective first arrangement of micro-picture elements in a first color and in a plane substantially coinciding with the focal plane of the focus elements, and iii) a respective second arrangement of micro-picture elements in a color different from the first color and in a plane substantially coinciding with the focal plane of the focus elements, wherein the pitch of the first and second arrangements of micro-focus elements and their relative positions are such that the arrangement of micro-focus elements corresponds to each of the first and second arrangements of micro-picture elements so as to generate a respective enlarged version of each of the micro-picture elements in accordance with an effect, and iii) a second arrangement of micro-picture elements in a first arr