DE102011012732B4 - Process for producing ceramic oscillating anilox rolls and correspondingly prepared anilox rolls - Google Patents

Abstract

A method of making ceramic oscillating anilox rolls characterized by the steps of sandblasting the metal roll, ceramic coating, ceramic layer mirroring, laser engraving and subsequent polishing to produce linear or honeycomb extending grooves on the surface of the ceramic oscillating anilox rolls, the following Parameters for making linear indentations are: number of ruling lines: 100 ~ 1200 L / inch, thickness of ceramic layer: 50 ~ 500 μm, depth of mesh points: 5 ~ 50 μm, and following parameters for producing honeycomb pits Number of rulings: 100 ~ 1200 L / inch; Arrangement angle: 0 ~ 90 °, thickness of ceramic layer: 50 ~ 500 μm, depth of mesh points: 5 ~ 50 μm, mesh point volume: 1.5 ~ 20 cc / m2.

Description

The present invention relates to the technical field of offset printing devices, in particular a novel method for producing ceramic oscillating anilox rolls

glossary

• - Printing plate: a metal plate, which is about 0.3 mm thick and is a carrier for printing texts and graphics.
• - Dampening solution: liquid used in traditional offset printing to separate the graphic and non-graphic areas. The main ingredient is water, which contains a certain amount of additives (printing plate protectants, wetting agents, isopropanol alcohol, buffers, antimicrobials).
• - Oscillating roller: a metal roller of the dampening solution supply device (see 1 , Heidelberg CD 102 F) in the manner of classic offset printing machines, which moves horizontally or vertically, and ensures that the dampening solution supplied forms a homogeneous film of water and also stores a certain amount of dampening solution.
• - Emulsion formation: a phenomenon that occurs in traditional offset printing when the ink absorbs too much dampening solution. This is also called emulsion formation.
• Tint: a phenomenon that occurs in classical offset printing when the amount of fountain solution supplied can not separate the graphic and non-graphic areas so that the non-graphic areas are also printed.
• - cc / m ² : cubic centimeter / square meter; Unit of water volume of the anilox roller; indicates the volume of water per cubic centimeter of water.
• - Principle of classical offset printing: elastic rubber is used as the transfer medium for the printing ink. Due to the different chemical properties of printing ink and dampening solution (the surfaces of the printing plate to be printed are ink-receptive while the white part of the printing ink is repellent), the printing ink is transferred from the printing frame to the printing substrate by means of a certain pressure. This means that the classic offset printing device must be equipped with printing ink and dampening solution (see 1 ).

Thanks to the continuous import of offset printing presses, such as Heidelberger Druckmaschinen, KBA, Manroland and others to China, as well as the great efforts of the Chinese industry, the offset printing is developing fast and the quality of the printed products is very good.

Particularly in the field of printing on cigarette packaging, offset printing produces many first-class cigarette logos, ensuring the visual effect and the counteracting effect of printing with gold and silver ink, black and white ink and special colors. Although offset printing has advantages in the area of screen printing, problems with too rapid emulsion formation, tinting, damage to the applicator moistening device, etc., can occur if large closed areas are printed in gold, silver, black-and-white or special color should.

These problems bother us and we can not find a better solution. To solve this problem, we have spent a long time researching and trying to solve the problem of the ink system and the ink supply system. However, the progress made was very small.

Functions of the sand-blasted oscillating roller: In classical offset printing, the sand-blasted oscillating roller is mainly used to ensure that the supplied fountain solution forms a homogeneous film of water and also a certain amount of dampening solution is stored. To ensure the function of the oscillating roller, namely to store dampening solution, the surface of most oscillating rollers of offset printing machines is sandblasted. In order to allow the dampening solution supplied to form a homogeneous film of water, the roller is arranged by the equipment manufacturers so that it runs horizontally, which is why it is referred to as an oscillating roller.

Disadvantages of the sandblasted oscillating roller: in classical offset printing, in particular in gold and silver printing, black and white printing and spot color printing, the sand-blasted oscillating roller constantly moves horizontally and vertically. The roller rubs constantly with small particles of the ink. The surface of the sandblasted roller is like sandpaper and the path of horizontal movement is small (usually less than 10 mm). This process is similar to when you're with Sandpaper grinds a part of the surface oscillating roller, wherein this surface part of the oscillating roller changes, so that the homogeneity of the dampening solution film on the surface of the oscillating roller is impaired and rapid emulsification or tinting is prevented and the fountain solution supply device of the oscillating roller as well the oscillating roller itself can be damaged quickly.

The object is achieved by a novel method for producing ceramic oscillating anilox rolls according to claim 1, in order to avoid possible damage to the partial surface of the oscillating roller and at the same time to ensure the quality of the dampening solution, so that it is more stable, uniform and controllable. Furthermore, the solution succeeds with a roll produced according to claim 1.

Process technology of the invention

The ceramic oscillating anilox roller uses the abrasion resistant surface smoothness of ceramic (see 2 ). Complemented by the stable ability to store and uniformly absorb water through the anilox roll, possible damage is avoided and the dampening solution rendered more stable, uniform and controllable, with the sandblasted surface being replaced by a laser engraved layer to address the problem of partial abrasion Reason to solve the horizontal and vertical movement of the oscillating roller and the tint, the rapid emulsification and the damage of the dampening device of the applicator roll.

Production of the ceramic oscillating anilox roll

• (1) Linear: Anzahl der Lineaturen: 100~1200 L/inch, Dicke der Keramikschicht: 50~500 μm, Tiefe: 5~50 μm.
• (2) Wabenförmig: Anzahl der Lineaturen: 100~1200 L/inch, Ausrichtungswinkel: 0~90°, Dicke der Keramikschicht: 50~500 μm, Tiefe der Netzpunkte: 5~50 μm, Netzpunktvolumen: 1.5~20 cc/m².

New roll: according to the dimensions given by the structural design of the oscillating roll, a metal roll is produced. First, the metal roller is sandblasted, and then coated with ceramic. Then the ceramic layer is mirrored and then engraved with a laser. Finally, the ceramic layer is polished to produce linear or honeycomb-shaped recesses on the surface of the ceramic oscillating anilox rolls (see 3 and 4 ).

• (1) Linear: number of lines: 100 ~ 1200 L / inch, thickness of ceramic layer: 50 ~ 500 μm, depth: 5 ~ 50 μm.
• (2) Honeycomb: Number of rulers: 100 ~ 1200 L / inch, Alignment angle: 0 ~ 90 °, Ceramic layer thickness: 50 ~ 500 μm, Depth of mesh points: 5 ~ 50 μm, Net point volume: 1.5 ~ 20 cc / m ² ,

• (1) Linear: Anzahl der Lineaturen: 100~1200 L/inch, Dicke der Keramikschicht: 50~500 μm, Tiefe: 5~50 μm.
• (2) Wabenförmig: Anzahl der Lineaturen 100~1200 L/inch, Ausrichtungswinkel: 0~90°, Dicke der Keramikschicht: 50~500 μm; Tiefe der Netzpunkte: 5~50 μm, Netzpunktvolumen: 1.5~20 cc/m².

Retrofitted Roller: According to the dimensions of the old roller, measure the thickness of the sand layer, remove the sand layer and sandblast the metal roller. Then apply the ceramic layer, which has the same thickness as the removed sand layer. The ceramic layer is then mirrored, laser engraved, and finally polished to produce linear or honeycomb pits on the surface of the ceramic oscillating anilox rolls (see 3 and 4 ).

• (1) Linear: number of lines: 100 ~ 1200 L / inch, thickness of ceramic layer: 50 ~ 500 μm, depth: 5 ~ 50 μm.
• (2) Honeycomb: number of lineations 100 ~ 1200 L / inch, orientation angle: 0 ~ 90 °, thickness of ceramic layer: 50 ~ 500 μm; Depth of grid points: 5 ~ 50 μm, grid point volume: 1.5 ~ 20 cc / m ² .

Comparison between sandblasted oscillating rollers and ceramic oscillating anilox rollers object sandblasted oscillating roller ceramic oscillating anilox rolls lifespan 3 to 12 months 1 to 5 years purchase price about 2850 euros / piece about 1900 Euro / piece Solving the problem of tinting and emulsion formation not good Good Damage to the moistening device of the applicator roll substantially negligible Measurement The measurement of the fountain solution changes constantly. The measurement of the dampening solution is stable.

The oscillating anilox roll of the present invention, which is acid and alkali resistant and manufactured using state of the art high energy plasma spraying and laser engraving technology, offers many advantages such as consistent quality, low production cost, long life, energy saving, promotion of product quality control, etc It is expected that this technique will generally be applied in the field of dampening solution supply of offset printing machines in the near future.

The invention will be explained schematically with reference to the drawings.

Show:

1 a schematic representation of printing ink and dampening solution supply system of the printing press of Heidelberger printing machines CD102 (A ink supply system B: dampening solution supply system C: oscillating roller);

2 the scheme of surface smoothness and the particularly wear-resistant property of ceramics;

3 the (linear) depth diagram of the ceramic surface of the oscillating anilox roll (A: depth of the mesh points); and

4 an enlarged view of the orientation angle of the honeycomb pits of the ceramic oscillating anilox roll.

Embodiment 1

New roller:

According to the dimensions of the oscillating roller, a metal roller is made, the metal roller is sandblasted, coated with ceramic, the ceramic layer is mirrored, then laser engraved, and finally the ceramic layer is polished to form linear or honeycomb-shaped recesses on the surface of the ceramic oscillating anilox roll produce.

Parameters: Number of lines 1200 L / inch, orientation angle: 60 °, thickness of ceramic layer: 185 μm, depth of mesh points: 8.5 μm, mesh point volume: 2.5 cc / m ² .

Embodiment 2

Treatment of an old roller:

According to the dimensions of the old roll, the thickness of the sand layer is measured, the sand layer is removed, sandblasted the metal roll, coated with a ceramic layer having the same thickness as the removed sand layer. Subsequently, the ceramic layer is mirrored, laser-engraved, and finally the ceramic layer is polished to produce linear or honeycomb-shaped recesses on the surface of the ceramic oscillating anilox roller.

Parameters: Number of lines: 1200 L / inch, orientation angle: 60 °, thickness of ceramic layer: 185 μm, depth of mesh points: 8.5 μm, mesh point volume 2.5 cc / m ² .

Claims (2)

A method of making ceramic oscillating anilox rolls characterized by the steps of sandblasting the metal roll, ceramic coating, ceramic layer coating, laser engraving, and subsequent polishing to produce linear or honeycomb extending grooves on the surface of the ceramic oscillating anilox rolls, the following Parameters for making linear indentations are: number of ruling lines: 100 ~ 1200 L / inch, thickness of ceramic layer: 50 ~ 500 μm, depth of mesh points: 5 ~ 50 μm, and following parameters for producing honeycomb pits Number of rulings: 100 ~ 1200 L / inch; Arrangement angle: 0 ~ 90 °, thickness of ceramic layer: 50 ~ 500 μm, depth of mesh points: 5 ~ 50 μm, mesh point volume: 1.5 ~ 20 cc / m ² . A ceramic oscillating anilox roll produced by the process of claim 1.

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