DE202019105811U1 - Tungsten carbide dampening roller for offset printing - Google Patents

Abstract

Tungsten carbide dampening roller for offset printing, which is provided between the dampening roller (17) and the dampening solution (18) offset machine for the quantification of water, characterized in that the tungsten carbide dampening roller for offset printing has at least one metering base roller (101) and one on the surface of the metering base roller arranged tungsten carbide coating (102), wherein the tungsten carbide coating (102) is provided with a plurality of ink cups (103) with a depth of 2 to 50 μm, which are used for sucking water.

Description

Technical field

The utility model relates to the printing technology sector, in particular a tungsten carbide dampening roller for offset printing,

Technical background

The dampening device of the ink system on the existing offset printing press mainly comprises a dampening solution ductor, a metering base roller, a dampening roller, an intermediate ink roller and a dampening device.

Among them, the metering roller commonly used in the prior art (for example, the metering roller used in the Heidelberg CD102 printing machine) mainly has a chrome-plated roller, the amount of water discharged is not easy to control. It is also relatively slow to reflect the change in water delivery. Even if the amount of water is adjusted to the optimum state, it is difficult to achieve a balance between ink and water, which affects the quality of the printed products. In this regard, the patent document with the application number discloses CN201711383204.8 a long-lasting quantitative water supply roller, a ceramic layer or a copper layer being provided as a wetting layer on the base roller and some micropores on the wetting layer in order to achieve a quantitative effect through the quantitative water absorption by micropores.

With this method, however, both the ceramic layer and the copper layer are not wear-resistant, and after a long working time, the wetting layer and the micropores on the metering roller are extremely easy to wear, which causes a problem of quantitative inaccuracy.

The patent document with the application number 201711007554.4 discloses such a tungsten carbide anilox roller and a method for producing the same, the anilox roller comprising a base roller and a tungsten carbide layer, the base roller being provided with a tungsten carbide layer, and with a few stitches being distributed on the tungsten carbide layer.

In the utility model, the anilox roller is used to evenly transfer a certain amount of ink to the printing plate and to quantify the ink. The depth of the mesh is not mentioned in this application, but the fluidity is low due to the viscosity of the ink. This technology can solve the misting problem by using the mesh instead of the ink supply problem. At the same time, the meshes are very deep due to the limitations of conventional laser engraving. If the technology is used directly for water supply, the water supply amount is large and the water with a high fluidity and a low viscosity cannot completely fill the deeper meshes, resulting in inaccurate water quantification, so the flatter meshes are required. However, due to the limitations of the laser engraving process, it is very difficult to engrave meshes the size of micrometers in tungsten carbide.

Content of the utility model

The purpose of the present utility model is to provide a tungsten carbide dampening roller for offset printing, which is used for quantitative water supply and has good wear resistance and long life.

The technical solution of the present utility model for solving the above problems is to provide a tungsten carbide dampening roller for offset printing, which is provided between the dampening roller and the dampening unit of the offset machine for quantifying water and has at least one metering base roller and one arranged on the surface of the metering base roller Tungsten carbide coating comprises, wherein the tungsten carbide coating is provided with several ink cups with a depth of 2 to 50 microns, which are used for sucking water.

The ink cup is more preferably 18-20 μm deep.

The opening of the ink cup further preferably has a rhombus with an angle of 45 ° -60 °.

More preferably, the bottom of the ink cup has a concave arc.

The metering base roller more preferably has a diameter of 90 mm or more.

The surface roughness of the tungsten carbide coating is more preferably 0.2 μm or less.

The ink cup further preferably has a line speed of 100 to 800.

The tungsten carbide coating is further preferably 50-1000 μm thick.

The tungsten carbide coating is more preferably 150-1000 μm thick.

1. 1. Die Wolframcarbidbeschichtung wird auf die Dosiergrundwalze gesprüht, und das Wolframcarbid weist eine gute Verschleißfestigkeit auf, was die Lebensdauer der Dosiergrundwalze erheblich verlängern kann. Da die Wolframcarbidbeschichtung selbst kein Öl oder Wasser absorbiert, sind Farbnäpfchen in der Wolframcarbidbeschichtung vorgesehen, um Wasser durch die Farbnäpfchen zuzuführen. Um das Wasser mit geringer Viskosität und hoher Fließfähigkeit genau zu quantifizieren, muss die Tiefe der Farbnäpfchen flach sein. Durch eine große Anzahl von Experimenten wird eine ölgekühlte Lasergravurmethode erzeugt, um das mikrometergroße Farbnäpfchen mit geringer Tiefe zu erhalten. Unter diesen kann zusätzlich zu dem herkömmlichen Kühleffekt die Ölkühlung auch den unebenen Boden des Farbnäpfchens durch Laser-Stanzen in eine glatte konkave Bogenform verbrennen und den Rückstand in dem Farbnäpfchen entfernen. Der konkav gebogene Boden des Farbnäpfchens kann der Oberflächenspannung des Wassers selbst entsprechen, so dass das Wasser die Farbnäpfchen vollständig füllen kann, wodurch die Genauigkeit des Wassers erreicht wird.
2. 2. die Öffnung des Farbnäpfchens weist eine Raute mit einem Winkel von 45° -60° auf, damit die Feuchtwalze Wasser ziehen kann.
3. 3. Das Farbnäpfchen aus Wolframcarbid weist eine relativ geringe Tiefe und hohe Festigkeit auf. Es kann mindestens 3 bis 4 Jahre ohne Verformung, Verschleiß, Änderung der Tiefe und Kapazität gehalten werden und weist eine lange Lebensdauer auf.

Compared to the prior art, the present utility model has the following advantages and effects:

1. 1. The tungsten carbide coating is sprayed onto the metering base roller and the tungsten carbide has good wear resistance, which can considerably extend the life of the metering base roller. Because the tungsten carbide coating itself does not absorb oil or water, ink cups are provided in the tungsten carbide coating to supply water through the ink cups. In order to precisely quantify the water with low viscosity and high flowability, the depth of the ink cups must be shallow. Through a large number of experiments, an oil-cooled laser engraving method is produced in order to obtain the micrometer-sized ink well with a shallow depth. Among these, in addition to the conventional cooling effect, oil cooling can also burn the uneven bottom of the ink cup into a smooth concave arc shape by laser punching and remove the residue in the ink cup. The concavely curved bottom of the ink fountain can correspond to the surface tension of the water itself, so that the water can completely fill the ink fountain, thereby achieving the accuracy of the water.
2. 2. The opening of the ink cup has a diamond with an angle of 45 ° -60 ° so that the dampening roller can draw water.
3. 3. The ink cup made of tungsten carbide has a relatively small depth and high strength. It can be kept for at least 3 to 4 years without deformation, wear, change in depth and capacity and has a long service life.

list of figures

• 1 A schematic diagram of the structure of a tungsten carbide dampening roller for offset printing;
• 2 A schematic diagram of the structure of a tungsten carbide dampening roller for offset printing, which is used for the Heidelberg offset printing press;
• 3 A schematic diagram of the ink cup of a tungsten carbide dampening roller for offset printing;

Figures of the figure above: 17 , Dampener roller 18 , Feuchtmittelduktor 100 , Tungsten carbide dampening roller for offset printing 101 , Dosiergrundwalze 102 , tungsten carbide 103 , Farbnäpfchen

Specific embodiment

The present invention will be described below in more detail with reference to the accompanying drawings. The following examples illustrate the invention and the invention is not limited to the following examples.

How 2 shows a tungsten carbide dampening roller for offset printing 100 mainly between the dampening roller 17 and the dampening solution 18 used in the dampening device of the Heidelberg offset printing press for quantitative water transfer.

How 2 shows, includes the tungsten carbide dampening roller for offset printing 100 at least one dosing base roller 101 and a tungsten carbide coating disposed on the surface of the metering base roll 102 , with the tungsten carbide coating 50 - 1000 µm and also 150-1000µm thick. The thicker tungsten carbide coating 102 on the one hand has better wear resistance, which increases the service life, and on the other hand the engraving of the subsequent ink cups 103 is facilitated.

At the same time, the surface roughness of the tungsten carbide coating should 102 be less than or equal to 0.2 µm to the surface flatness of the tungsten carbide coating 102 coated metering base roller 101 sure. It is assumed that the engraving of the meshes with uniform specifications and the quantitative water supply are fully prepared.

The tungsten carbide coating 102 is with several ink cups 103 provided with a depth of 2 to 50 µm for drawing water. Furthermore, the ink cups 103 18 to 20 µm deep. Micrometer-sized ink cups make it possible to fill the ink cups with water with a low viscosity and a high fluidity, which leads to an effective quantification.

Meanwhile, how 3 shows the opening of the ink cup 103 a diamond with an angle of 45 ° -60 ° so that the dampening roller can draw water; the concavely curved bottom of the ink cup 103 can correspond to the surface tension of the water itself, so that the water has the ink cups 103 can completely fill, thereby achieving the accuracy of the water.

The ink cup 103 has a line speed of 100 to 800. The Line speed of the ink cups 103 and the depth of the ink cups 103 together determine the amount of water in the tungsten carbide dampening roller for offset printing.

In addition, the diameter of the metering base roller is 101 90 mm or more to the tungsten carbide coating 102 to spray on it.

1. (1) eine Dosiergrundwalze mit einem Durchmesser von größer oder gleich 90 mm wird verwendet. Dabei muss der Durchmesser der Dosiergrundwalze größer oder gleich 90 mm sein, sonst wird sie beim Durchführen von Schritt (2) von Überschallgeschwindigkeit durchdrungen.
2. (2) Mit einer Überschallgeschwindigkeit von Mach 2 oder höher bei einer hohen Temperatur wird mit dem Wolframcarbid die Dosiergrundwalze gespritzt; wobei die Wolframcarbidbeschichtung 50-1000 µm und ferner 150-1000µm dick ist. Danach wird die Wolframcarbidbeschichtung ebenfalls auf eine kontinuierliche Ebenheit von 0,2 µm oder weniger poliert. Die kontinuierliche Ebenheit bedeutet, dass, wenn die Dosiergrundwalze mit der Wolframcarbidbeschichtung als Verbundwalze bezeichnet wird, die Differenz zwischen dem Radius jeder runden Oberfläche der Verbundwalze weniger als 0,2 µm beträgt, um die Glätte der Oberfläche der Wolframcarbidbeschichtung sicherzustellen..
3. (3) Die Farbnäpfchen werden in einer Wolframcarbidbeschichtung mit einer Tiefe von 2 bis 50 µm lasergraviert, und ferner mit einer Tiefe von 18 bis 20 µm graviert. Unter anderem wird bei der Lasergravur die Ölkühlung verwendet, das heißt, nachdem das Farbnäpfchen durch den Laser ausgestanzt wurde, wird es in das Öl eingetaucht oder in die zu kühlende Farbnäpfchen eingeölt, und das Öl wird verwendet, um den unebenen Boden der Farbnäpfchen in eine glatte konkave Bogenform zu verbrennen und gleichzeitig die Reste im Farbnäpfchen zu entfernen.
4. (4) Die Farbnäpfchen werden tiefenreinigt, um eine Wolframcarbid-Feuchtwalze für Offsetdruck.

The manufacturing process of the tungsten carbide dampening roller for offset printing comprises the following steps:

1. (1) A metering base roller with a diameter greater than or equal to 90 mm is used. The diameter of the dosing base roller must be greater than or equal to 90 mm, otherwise it is carried out when performing step ( 2 ) penetrated by supersonic speed.
2. (2) At a supersonic speed of Mach 2 or higher at a high temperature, the dosing base roller is sprayed with the tungsten carbide; with the tungsten carbide coating 50 -1000 µm and further 150-1000µm thick. Then the tungsten carbide coating is also polished to a continuous flatness of 0.2 µm or less. Continuous flatness means that when the metering base roll with the tungsten carbide coating is referred to as the compound roll, the difference between the radius of each round surface of the compound roll is less than 0.2 µm to ensure the smoothness of the surface of the tungsten carbide coating.
3. (3) The ink cups are laser engraved in a tungsten carbide coating with a depth of 2 to 50 µm, and further engraved with a depth of 18 to 20 µm. Among other things, oil cooling is used in laser engraving, i.e. after the ink cup has been punched out by the laser, it is immersed in the oil or oiled in the ink cups to be cooled, and the oil is used to fit the uneven bottom of the ink cups into one burn the smooth concave arch shape and at the same time remove the remains in the ink cup.
4. (4) The ink cups are deep cleaned to a tungsten carbide dampening roller for offset printing.

The specific embodiments described herein are only illustrative of the utility model concept. A person skilled in the technical field of the present invention can make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as he does not depart from the scope of the present invention or the scope defined by the claims, all of these should be within the scope of the present invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• CN 201711383204 [0003]

Claims (9)

Tungsten carbide dampening roller for offset printing, which is provided between the dampening roller (17) and the dampening solution (18) offset machine for the quantification of water, characterized in that the tungsten carbide dampening roller for offset printing has at least one metering base roller (101) and one on the surface of the metering base roller arranged tungsten carbide coating (102), wherein the tungsten carbide coating (102) is provided with a plurality of ink cups (103) with a depth of 2 to 50 μm, which are used for sucking water. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the ink cup (103) is 18-20 µm deep. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the opening of the ink cup (103) has a rhombus with an angle of 45 ° -60 °. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the bottom of the ink cup (103) has a concave arc. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the metering base roller (101) has a diameter of 90 mm or more. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the surface roughness of the tungsten carbide coating (102) is 0.2 µm or less. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the ink cup (103) has a line speed of 100 to 800. Tungsten carbide dampening roller for offset printing Claim 1 , characterized in that the tungsten carbide coating (102) is 50-1000 µm thick. Tungsten carbide dampening roller for offset printing Claim 8 , characterized in that the tungsten carbide coating (102) is 150-1000 µm thick.

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