Rotogravure pdf

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Gajanandtrading Works. This provides clients with enhanced flexibility, so as to print packages of varying sizes, for which cylinders with different diameters are required. The diameter may be set in accordance with the process of the invention with an accuracy of 2 mm, 1 mm, 0. The advantage of varying the thickness of the zinc layer rather than any subsequent layer is that the properties of the engraving layer are not subject to change, i. In one preferred embodiment, the thickness of the zinc layer is tuned so as to arrive at a diameter that is a predefined amount less than the final diameter.

The advantage of zinc over alternative materials is believed to be due to its softness, which allows conformal deposition onto the underlying gravure base, rather independent of the material at the surface thereof. The zinc layer is suitably provided as a plurality of sublayers.

Such sublayers suitably have a thickness of less than 0. The sublayers are for instance applied in a spraying process, though alternative deposition processes are not excluded. The overall thickness of the applied zinc layer is suitably in the order of millimeters, for instance between 0. However, other thicknesses are not excluded.

In order to obtain a desired cylindrical shape, with typically a substantially circular cross-section, a shaping step is suitably done after the deposition of the zinc layer. Such a shaping step may be carried out with any conventional tool, for instance by cutting with a cutting tool or treatment with a laser, such as laser cutting. Further, the present zinc layer provides excellent adhesion to the present copper support layer. In a most suitable embodiment, the provision of the copper support layer is carried out to form a brass layer at the interface of the zinc layer and the copper support layer.

Thereto, the copper support layer may be deposited by means of electrodeposition or such that melting occurs at the surface of the cylinder, i. Brass is known to have a low brittleness at ambient temperature.

Also, in these use conditions, the interdiffusion of copper and zinc is not an issue. Suitably, the present zinc layer is a zinc alloy. One advantage of such alloy is a higher stability against interdiffusion of zinc and copper, particularly when applying the -copper- support layer by means of electroplating.

An upper limit to the content of the alloying element s results from an increase in hardness with an increase in alloying element.

It is an advantage of the present invention that the refurbishing process of rotogravure cylinder is simplified. Particularly, the step of applying an intermediate polymer layer could be eliminated in comparison with the method of. Preferably, the present step i of providing the rotogravure cylinder comprises the provision of a used rotogravure cylinder.

Advantageously, the present method can be used to refurbish nearly all type of rotogravure cylinders and thus is broadly applicable. In a preferred embodiment, the present metallic support layer, particularly a copper support layer, is applied by melting of deposited particles.

In this manner, a continuous copper support layer was obtained, which moreover included to compressive stress. The copper support layer is more preferably obtained by deposition of copper particles in a spraying process. More preferably a high velocity spraying process is used. Suitably, the cylinder herein rotates during the deposition process. The particles will impact on the cylindrical base, which results in liberation of a significant amount of energy in the form of heat.

This heat will warm up the particles so as to melt at least partially. Alternatively, use is made of a sequence of a preplating step and a plating step for the deposition of the support layer, wherein the preplating step is carried out in alkaline conditions, and the plating step is carried out in acid conditions. The materials deposited in the preplating step and the plating step do not need to be identical. For instance, the preplating step may result in a copper alloy, for instance copper-nickel, whereas the plating step may result in substantially pure copper.

This is made possible in that the formed metallic support layer has a very low porosity, suitably less than 1. Most suitably, the present copper support layer is after formation even thinned back.

This thinning is for instance carried out by sawing. A lubricant solution may be applied simultaneously with the cooling. This process furthermore results in a suitable polishing of the surface of the metallic support layer. The polished copper support layer is then suitable for the electroplating of the copper engraving layer. After deposition of the engraving layer a protection layer is suitably applied. The protection layer is thereafter suitably roughened to a surface roughness between 0.

These and other aspects of the invention will be further elucidated with respect to the following figures, wherein:. The FIGS. Equal reference numerals in different figures refer to identical or corresponding figures.

The length of such cylinders is typically at least 1. Rather the base may be hollow. Alternatively, the base may comprise several layers, such as a steel core and an aluminium top layer. The term aluminum in the present invention refers to pure aluminum, aluminum with small addition of other materials or aluminum alloys. Likewise, the term copper refers to pure copper, copper with small addition of other materials or copper alloys.

Preferably, use is made of a jet with a velocity above the said particle velocity. Generation of a supersonic jet is considered most advantageous.

In a preferred embodiment, the present applying of a zinc layer to the exposed rotary gravure base comprises thermal wire spraying of the exposed rotary gravure base with zinc, or a zinc containing layer such as a zinc alloy, preferably comprising thermal wire spraying of multiple layers.

In a preferred embodiment, the present applying of a zinc layer to the exposed rotary gravure base comprises applying a zinc layer to achieve a cylinder having a diameter, which is smaller than a final diameter according to a predefined difference. The relevance hereof is that the properties of the resulting cylinder, relevant for engraving and use, can be the same, even though the final diameter varies. A final diameter is defined as the desired diameter of the provided refurbished rotogravure cylinder.

It is not excluded that inner cores of the said particles remain in solid form.