Gravure machine offset cylinder

FIELD: printing.

SUBSTANCE: invention relates to offset cylinder and method of its production, as well as to the gravure machine. The gravure machine comprises a plate cylinder with printing plates with deep-gravure printing elements corresponding to gravure printing structure to be printed on the base, the gravure cylinder interacting with the printing cylinder. The offset cylinder incorporates, at least, one offset blanket whereon multi-colour ink is rolled by means of selector cylinders. A preset colour ink is applied onto every selector cylinder, the ink being fed from the ink device coupled thereto. Note, that every selector cylinder has recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour. Note here, that, at least one said offset blanket contains, at least, lipophilic surface layer with recesses or lipophobic surface layer with recesses, including sections with and without recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour.

EFFECT: higher accuracy of the ink application, optimised consumption of the ink.

6 cl, 7 dwg

 

The present invention relates to the offset cylinder gravure printing, containing at least: a plate cylinder carrying the printing form with an in-depth printing elements corresponding to the special structure for gravure printing, which should be printed on a substrate that interacts with the printing cylinder bearing substrate on which are required to comply with the imprint; offset cylinder containing at least one offset canvas on which roll printing ink of different color selector cylinders, with each selector cylinder is applied printing ink of a given color and each selector cylinder contains cavities, the contours of which correspond to the patterns for gravure printing, which ought to apply printing ink mentioned specified color.

The present invention also relates to a machine gravure printing with offset cylinder.

Color gravure printing machine is known, especially for print-protected securities such as banknotes and other similar objects. For example, in U.S. patent No. 5062359, the content of which is incorporated into the present application by reference, describes color gravure printing machine, fed from a roll or sheets. This machine includes: a plate cylinder with multiple printed forms; printing cylinders; printing device and colorful so the t teams with colorful cylinder, having an elastic surface, interacting with the printed forms; cylinders for rolling ink selected color, containing deepening with contours corresponding to the painted areas to be printed in different colors that are in contact with the periphery of the precast colorful cylinder; and colorful device associated with each cylinder for rolling ink selected color.

The other machine is described, for example, in U.S. patent No. 4516496, the content of which is incorporated into the present application by reference. This patent also describes color gravure printing machine, such a machine is presented in U.S. patent No. 5062359 mentioned above. As shown in this patent, the inking unit contains many of the selector cylinders, used for carrying ink of a given color of the colorful blocks on a collecting cylinder, which, in turn, printing ink is transferred in-depth printing elements of the printing forms. Each selector cylinder has a solid surface such as the surface covered with ebonite, plastic and the like, or metal, and each selector cylinder contains in-depth plots, the contours of which correspond exactly to the contours of the surface to be printed in the corresponding color.

Another example of the printing machine deep is Ekati disclosed in U.S. patent No. 5899145, the content of which is incorporated into the present application by reference.

The deficiency in the art is that the paint patterns for gravure printing, in particular, on the printing form, is not exactly in the resulting printing ink is transferred to a larger area than the effective structure for gravure printing, and the paint then remove the cleaning apparatus. In result lost a large amount of printing ink as it is applied beyond the places that actually match advanced printing elements of the printing form, and then remove it without using for coloring printing forms.

Another problem faced by the technology of printing, is that due to the high pressure required to perform the printing operation, the printing plate is subjected to deformation elongation during their lifetime, which adversely impact on the exact combination of blankets precast cylinder with the printed forms containing in-depth printing elements. For this reason also the printing ink is applied, beyond the depth of printing elements, and lose it, removing the cleaning device.

To eliminate these losses unused ink, an attempt was made to improve the accuracy grease the printing ink in depth the printing elements of the printing forms.

The aim of the present invention is to improve the known machines and methods.

Another objective of the present invention is to reduce the amount of printing ink to the required size to perform printing without compromising its quality.

An additional objective of the present invention is to improve the accuracy of applying printing ink to the plate cylinder by means of prefabricated, or offset cylinder.

These goals are reached by replicating patterns for gravure printing, which should be applied printing ink, offset paintings offset cylinder and through the use of special materials for the manufacture of blankets.

According to specific variants of execution of the invention it is possible to use special patterns blankets on a collecting cylinder, and the above-mentioned structure, activate to produce very precise ink image on the printing form (forms).

To achieve this purpose the invention defined by the claims.

According to the first embodiment of the invention uses the ability of the acceptance or rejection of printing ink lipophilic and hydrophilic structures, and this structure creates an offset canvas and do deepening matching metal PE atoi form. Offset canvas is lipophilic, and its cover lipophobia/hydrophilic coating, in which you can run deepening, thus achieving a very precise application of printing ink to the printing plate. Of course, offset blade must be altered, as soon as due to the elongation of the metal printing plates are formed blank printed paint a thin line.

In the second embodiment of the invention uses the ability of the acceptance or rejection of printing ink lipophilic and hydrophilic structures and this structure creates an offset canvas and do deepening matching metallic printed form. Offset canvas is lipophobia/hydrophilic, and it covers lipophilic coating, in which you can run deepening, thus achieving a very precise application of printing ink to the printing plate. Of course, offset blade must be altered, as soon as due to the elongation of the metal printing plates are formed blank printed paint a thin line.

In the third embodiment of the invention uses the ability of the acceptance or rejection of printing ink and perform the desired pattern on the offset of the canvas, which exactly matches the metal of the printed form. Offset canvas cover lipophilic coating, to what PR can be performed deepening, thus achieving a very precise application of printing ink to the printing plate. Of course, offset blade must be altered, as soon as due to the elongation of the metal printing plates are formed blank printed paint a thin line.

For the formation of multiple layers of lipophilic and/or hydrophilic materials, you can use several processes known in the field. The first process is a coating process in which layers are sequentially applied to the base layer. Another process that can be used is the lamination process. Additional well-known process is the Sol-gel process, known under the brand name ORMOCER®e company Fraunhofer Institut Silicatforschung (see, for example, a web page, published on the Internet at the address www.isc.fhg.de). Using the described processes, it is possible to form layers of lipophilic and/or hydrophilic materials according to the invention.

The following describes the different variants of the invention with reference to the drawings, which depict:

in Fig. 1 - schematic diagram gravure printing according to the invention;

in Fig. 2A and 2B is a schematic view of the layers of which form a blanket printing cylinder according to the first embodiment of the invention;

in Fig. 3A and 3B is a schematic view of the layers of which form the offset is alatna offset cylinder according to another embodiment of the invention;

in Fig. 4A and 4B is a schematic view of the layers of which form a blanket printing cylinder according to another embodiment of the invention.

The principle of operation of the printing machine gravure printing, fed by the sheet or roll-described first with reference to Fig. 1, in which the direction of rotation of the various cylinders are indicated by arrows. The following description of the process of printing refers to the printing machine, the power of which carry the sheets, but the same principles apply also to the printing machine, the power of which carry the sheet from the roll. The sheets 1 are served in the printing machine through the feeding apparatus (not shown) and transmit the transfer cylinder 2 onto the printing cylinder 3. The leaves keep on printing cylinder 3 by hooks 4 to process the onslaught, and the said hooks are placed in the recesses 5 in the sides of the cylinder. In the shown example, the printing cylinder 3 contains two segments, each of which hold one sheet to be printed. Printing cylinder 3 communicates with the plate cylinder 6, and between the cylinders 3 and 6 form a stripe print contact, in which the sheet is subjected to gravure printing. The plate cylinder 6 carries (in the example shown in the drawing) three printing plates held with clamps (not shown is), located in the recesses 7 of the shell plate cylinder. Printed forms, as is well known with this method of printing, contain in-depth printing elements corresponding to the pattern to be printed, and advanced printing elements of the printing plates in the printing process to fill the printing ink, which is then transferred to sequentially supplied sheets.

After the plate cylinder 6 is offset cylinder 8, also called a reservoir cylinder, which is used to transfer ink to the printing plate of the plate cylinder 6. Offset cylinder 8, as schematically shown in Fig. 1, three bears blanket 9. Offset cylinder 8 has a smooth surface, forming a blanket 9, to which is applied a printing ink selector cylinders 10, distributed along the periphery of the offset cylinder 8. For each selector cylinder 10 roll printing ink of a given color with colorful device. The surface of the selector cylinder 10 is harder than the surface of the offset cylinder 8, and the surface is divided into sections with recessed areas, the contours of which correspond exactly to the contours of the depth of printing elements for printing forms, intended to receive ink from each of the corresponding selector cylinder 10.

As is customary in the data is the first field of technology each selector cylinder 10 is connected with a colorful device containing at least a tubular roller 11, rollers 12 for transferring printing ink vibrating roller 13, the drawer 14 for printing inks containing printing ink of a given color, and the actuator 15 to drive the selector cylinder 10.

Printing ink contained in box 14 for printing ink is transferred from the tubular roller 11 to the selector cylinder 10 by means of rollers 12 for transferring printing ink, and then the selector cylinder 10 on the plate cylinder 6. The excess ink from the plate cylinder 6 is then removed by the doctor of the cylinder 17.

After the sheet 1 is passed through a strip of printed contact and transfer printing ink, they are taken from the printing cylinder, for example, using pin cylinder 16, for further processing.

In Fig. 2A depicts the layers of which form a blanket 9 offset cylinder 8 (hereinafter described in detail). Offset cylinder 8 includes a base layer 30, on which a lipophilic layer 31. Then on top of the lipophilic layer 31 are lipopoly layer 32, suitable for execution in its recesses. And finally, on top of lipofuze layer 32 create a structure 33 that exactly matches the form of in-depth printing elements of the printing forms, which must be completed printed KRA is coy through the selector cylinder 10.

Structure 33 create, for example, as follows. Colorful cylinder cover printed paint with selector cylinder, and then the printing ink transferred to the printing form. After that, by using, for example, the printing cylinder 17 (see Fig. 1) from the printing plate to remove excess ink. The image filled with printing ink, printed on each form on the plate cylinder 6 is then transferred to a collecting cylinder 8 by the rotation of the cylinders 6 and 8 in the absence of substrate, i.e. paper, between them, passed through a strip of printed contact, in this way forming a structure 33 shown in Fig. 2A and 2B, which corresponds exactly to the advanced printing elements of the printing plates of the plate cylinder 6, which should be completed in block paint with very precise alignment.

After applying the various layers on the base layer offset cylinder and create patterns 33, corresponding advanced printing elements of the printing forms, lipopoly layer 32 are removed by appropriate means, for example, with a laser 34, as shown in Fig. 2B, or other equivalent means, for exposure of a lipophilic layer 31 between the elements of the structure 33. As a result, as shown in enlarged scale in Fig. 2B, the ink 35 rejected lipophobia SL is eat 32 and going on exposed areas of lipophilic layer structure 31, thus increasing the accuracy of the printed ink-depth printing elements in the plate cylinder 6 by means of the offset cylinder 8 and, consequently, reducing the amount of printing ink is removed by doctor blade cylinder 17 (see Fig. 1).

Another variant of the invention is described below with reference to Fig. 3A and 3B. This embodiment of the invention, the layers of which form the surface of the offset cylinder 8, represent the core layer, lipopoly layer 36 and lipophilic surface layer 37, which can be done grooves, which create a structure 38 that exactly matches the form of in-depth printing elements of the printing forms, which must be completed in block paint. Structure 38 can be created in the same manner as the structure 33 (see above). By appropriate means, such as laser 34 or other equivalent means, remove lipophilic layer 37, except for sites located under the structure 38, thus exposing lipopoly layer 36, which rejects the printing ink from the structure 38. This method allows therefore to improve the accuracy of applying printing ink to the printing plate for gravure printing.

Another variant of the invention is described below with reference to Fig. 4A and 4C. These figures offset cylinder 8 soda is separated by the base layer 30, which have a lipophilic layer 40, and these lipophilic layer 40 additionally, the support structure 41, corresponding to the form of in-depth printing elements forms that must be completed in block paint. After creating patterns 41, for example, in the same way as structures 33 or 38 (see above), this embodiment of the invention the lipophilic layer 40 then performs deepening appropriate means, for example by laser 34, or other suitable equivalent means, to remove part of the layer 40 between the elements of the structure 41, as shown in Fig. 4V.

Preferably, the materials used as lipophilic and hydrophobic materials included, but were not limited to this list, a rubber composition, silicate composition, and as lipofuze material include silicone compositions, rubber compositions. Of course, these materials are shown here only for example. Other equivalent materials with appropriate characteristics can be used to implement the present invention. As other examples, the Sol-gel process, known under the brand name ORMOCER®e company Fraunhofer Institut Silicatforschung (see, for example, a web page, published on the Internet at the address www.isc.fhg.de)mentioned above.

It is also preferable that the operation of making the recesses in the offset paintings were executed, using the offset cylinder 8 mounted on the printing machine to maintain a very precise alignment between the offset cylinder 8 and the plate cylinder 6, when patterns 33, 38 or 41 has already been created on the surface of the offset cylinder 8.

1. Offset cylinder gravure printing, containing at least the plate cylinder (6)carrying the printing form with an in-depth printing elements corresponding to the structure for gravure printing, which should be printed on the substrate (1), cooperating with the printing cylinder (3), the supporting substrate (1), which are required to comply with the imprint; offset cylinder (8)containing at least one offset blade (9), on which roll printing ink of different color selector cylinders (10), with each selector cylinder (10) is applied printing ink specified color, and each selector cylinder contains deepening with contours corresponding to the field patterns for gravure printing, which should be applied printing ink mentioned specified color, characterized in that the said at least one offset canvas (9) contains at least lipophilic surface layer (37, 40), containing indentations, or lipopoly surface layer (32)containing recesses respectively include areas without holes or sections of the development is s, the appropriate structure for gravure printing, which should be applied printing ink on said plate cylinder (6).

2. Offset cylinder according to claim 1, in which each offset canvas (9) contains a lipophilic surface layer (37), including deepening, located on top of lipofuze layer (36), and lipopoly layer (36) strip on the sites where the lipophilic surface layer (37) is provided with recesses for the exclusion of printing ink in the direction popularnych plots lipophilic surface layer (37).

3. Offset cylinder according to claim 1, in which each offset canvas (9) contains lipopoly surface layer (32)comprising recesses located on top of the lipophilic layer (31), and lipophilic layer (31) naked in areas where lipopoly surface layer (32) is provided with recesses for receiving printing ink between naplavlenie areas lipofuze surface layer (32).

4. Color gravure printing machine, characterized in that it contains at least one offset cylinder according to any one of the preceding paragraphs.

5. A method of manufacturing a printing cylinder according to any one of claims 1 to 3, comprising the steps:

install blanket (9) without grooves on the blanket cylinder (8) gravure printing, and referred offset canvas (9) without recesses includes at least lipo is safe surface layer (37, 40), which can be performed deepening or lipopoly surface layer (32)which can be performed deepening;

rolling ink on the offset cylinder (8) with offset blade (9) without recesses selector cylinders (10);

transferring printing ink, thumb on the offset cylinder (8), to the outer cylinder (6);

removal by means of the squeegee from the surface of the plate cylinder (6) excess printing ink, caused outside of in-depth printing elements of the printing form;

transferring printing ink from the plate cylinder (6) to the offset cylinder (8) thus, to form the structure (33, 38, 41) to offset the canvas (9)that exactly matches the structure for gravure printing, which should be applied printing ink,

in the case where the offset of the canvas contains a lipophilic surface layer (37, 40), which can be made deeper, perform depressions in the surface layer in areas where the surface layer is not covered with the aforementioned structure (38, 41); or if offset canvas (9) contains lipopoly surface layer (32)which can be made deeper, perform depressions in the surface layer in areas where the surface layer is covered with the aforementioned structure (33).

6. The way the paragraph is paragraph 5, in which lipophilic or lipophobia surface layer (37, 40, 32) perform the deepening of the laser (34).



 

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