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Method for producing anilox rolls

An anilox roll and roll surface technology, applied in the field of anilox roll manufacturing, can solve the problems of time-consuming, difficult to reproduce, etc.

Active Publication Date: 2012-01-04
海德堡印刷机械知识产权股份两合公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a laborious process which is difficult to reproduce and takes a lot of time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] a) A journaled roll body made of ST52 steel is provided, which roll body has a drum length L of 560 mm and a drum jacket diameter D of 180 mm. The turned roll body was then provided with a 0.275 mm thick chromium oxide layer on the roll jacket in a plasma spray system.

[0016] b) Next, the drum surface is ground into the drum shape with a tolerance of 0.01 mm by means of a vitrified bonded diamond grinding disc. Finally, the drum surface was smoothed three times in a honing machine with a rotational speed of 200 rpm and a feed rate of 200 mm / min with a pressing force of 2.5 bar. A honing stone with a grit size of 2000 was used here. The drum surface thus treated thus has R Z = Roughness of 1.9 μm.

[0017] c) Then, the roll body treated in this way is put into the laser processing equipment. The device contained a repetitively operating ytterbium-fiber laser with a pulse duration of 130 ns at a pulse repetition rate of 500 kHz. The average power of the laser was 1...

example 2

[0023] In this case, compared with the production process of Example 1, the processing step b) was modified as follows: honing four passes with a honing stone with a grit size of 4000 and a contact force of 1.5 bar. The drum surface thus treated thus has R Z = Roughness of 1.5 μm.

[0024] In the ensuing laser engraving, the roller speed was reduced to 250 revolutions per minute and the axial feed was increased to 7.5 μm / revolution with the other settings of the laser being the same. With a simple sweep of the roller surface it is already possible to obtain sufficiently well-defined grooves with an average depth of about 20 μm, so that further engraving can be dispensed with.

[0025] After laser engraving (step c)), the structured anilox roll was not honed again but polished manually for about 10 minutes. The anilox roll thus obtained had properties as good as in Example 1.

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PUM

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Abstract

The invention relates to anilox rolls for anilox color decks, engraved by a short-pulse laser, wherein the cross-sectional shape of the engraved cells or hachures is machined out by a plurality of pulses of the repeatedly operating laser. The pulse energy and mean power of the laser are selected or set so that at least 0.5 cm3 of material / hour is ablated. The surface of the roll is subsequently smoothed or cleaned by a mechanical finishing step.

Description

technical field [0001] The invention relates to a method for the manufacture of anilox rolls, in particular those such as those known under the designation "anilox rolls" in so-called short ink units of offset printing presses for use in combination with doctor blades or chambered The ink is removed from the ink reservoir and transported in the direction of the printing plate by additional rollers. However, anilox rollers are also used in coating units in order to meter the amount of varnish to be applied and, in addition to offset printing, also in other printing methods such as flexographic printing or in corresponding machines. It is already known that anilox rollers which were previously structured by means of an etching process or engraved mechanically by engraving knives penetrating into the annealed copper skin on the steel roller body are now also engraved with laser tools. This method is described, for example, in the article "Universal anilox rolls for printing pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41C1/05B41N7/06
CPCB41C1/05B41N7/06
Inventor H·维勒R·温特A·蒂尔曼G·富克斯
Owner 海德堡印刷机械知识产权股份两合公司
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