Method for direct engraving of cups to accept the printing ink for rotogravure
A method for direct engraving of cups to accept printing ink in a surface of print cylinders specified for rotogravure. The engraving is executed such that the cups are formed from a predetermined number of engraved image points.
1 . A method for direct engraving of cups to accept printing ink in a surface of print cylinders specified for rotogravure wherein the engraving is executed such that the cups are formed from a predetermined number of engraved image points.
2 . A method according to claim 1 wherein an engraving depth of the image points can be formed differently.
3 . A method according to claim 2 wherein the engraving depth of the image point can be formed differently given a same expansion of a surface element of the image point.
4 . A method according to claim 2 wherein the engraving depth is established in stepped depth intervals.
5 . A method according to claim 4 wherein the depth intervals are alternatively in a bit pattern of 1 to 8 bits.
6 . A method according to claim 5 wherein the bit pattern is 2-bit.
7 . A method according to claim 1 wherein a cup is comprised of at least one image point.
8 . A method according to claim 1 wherein a cup is comprised of a maximum of 255 image points.
9 . A method according to claim 1 wherein a surface element of the image points can be variably set with regard to its surface expanse.
10 . A method according to claim 9 wherein the surface expanse is in a range of 10 to 20 μm.
11 . A method according to claim 1 wherein the engraving event is executed such that partial cups are formed from a predetermined number of image points.
12 . A method according to claim 1 wherein an electromechanical engraver executes the engraving of the image points.
13 . A method according to claim 1 wherein a laser light executes the engraving of the image points.
14 . A method for engraving of cups to accept printing ink in a surface of a rotogravure print cylinder, comprising the steps of:
with one of a diamond and a laser beam directly forming each of the cups in said surface from a plurality of image points separately engraved in said surface, and wherein at least one of the image points has a depth which is different than a depth of another of said image points.
15 . A method of claim 14 wherein the laser beam is used for engraving each image point of each cup.
16 . A method of claim 14 wherein the diamond is used for engraving each image point of each cup.
17 . A method of claim 14 wherein engraved image points at a periphery of the cup have a depth which is less than a depth of image points inside of said periphery.
18 . A method of claim 14 wherein each cup lies within a respective square of a raster mesh.
19 . A method of claim 14 wherein each image point of each respective cup has a depth which is one of at least four different depth values.