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A method for treating a lithographic printing plate

A printing plate and lithographic technology, which is applied in the field of processing lithographic printing plates, can solve the problems of high cleaning strength, reduced ink solubility, and increased solvent level.

Inactive Publication Date: 2011-02-23
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its ink solvency is significantly reduced, and the solvent level of this plate wash is significantly increased, which is unfavorable from both an environmental and an economic point of view
To meet high health and safety standards, esters of vegetable oils and / or esters of vegetable oils in combination with aliphatic hydrocarbons have been successfully used in the prior art; however, their cleaning strength is still not as good as that of aromatic hydrocarbons

Method used

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  • A method for treating a lithographic printing plate
  • A method for treating a lithographic printing plate
  • A method for treating a lithographic printing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] 1. Preparation of comparative plate washing agent PC-01.

[0108] A comparative plate wash PC-01 having the composition given in Table 1 was prepared as follows.

[0109] Preparation of the aqueous phase:

[0110] 85% by weight phosphoric acid was added to demineralized water, followed by sorbitol and Glucopon. Then add Parmetol A26 while mixing until all components are completely dissolved.

[0111] Preparation of solvent phase:

[0112] Add isopropyl laurate to Shellsoll D-60 at room temperature and stir until completely dissolved.

[0113] Preparation of emulsion:

[0114] The solvent phase was slowly added to the vortex of the aqueous phase while stirring @ 15K rpm in an Ultra Turrax T25 digital mixer equipped with a S25N mixing head (both from IKA Werke GmbH & Co). After complete addition of the organic portion, the resulting emulsion was stirred at the same speed for an additional 2 minutes.

[0115] Finally, Rheogel IRX55395 was added to this emulsion ...

Embodiment 2

[0151] 1. Preparation of plate washing agents PC-04 to PC-08.

[0152] Using the polypropylene glycol ethers given in Table 4, plate wash formulations PC-04 to PC-08 were prepared in the same manner as PC-02.

[0153] Plate wash formulations were first evaluated with respect to emulsion stability (ES). Evaluate ES as follows:

[0154] The stability of the emulsion was evaluated with a Lumisizer 610 device (available from LUM GmbH (Germany)). Stability was evaluated as follows:

[0155] The assay cell (cuvette) is subjected to high G forces by centrifugation. The full length of the cuvette was analyzed by measuring the transmission of NIR light (CCD sensor). As a result, the distribution of light transmitted through the full length of the cell during centrifugation was recorded. Monitor for any changes in the upper meniscus.

[0156] The rotational speed was 640 rpm and the total test time was 9 hours and 45 minutes. The cuvette distribution was recorded at regular inter...

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Abstract

A method for treating a lithographic printing plate is dislosed comprising the step of applying a liquid to the plate including an aqueous phase; a solvent phase which is present in the liquid in an amount <= 40%wt; and one or more compound (s) having the following formula (I ): R1-O-(Y)n-H wherein R1 is a methyl group, an ethyl group, a propyl group or a butyl group; Y represents -CH2-CHR2 -0- with R2 = hydrogen or an alkyl group and / or mixtures thereof; and n is an integer >= 10.

Description

field of invention [0001] The present invention relates to a method of processing lithographic printing plates. Background of the invention [0002] Lithographic printing presses use a so-called printing master, such as a printing plate, that is mounted on a cylinder of the printing press. A master bears a lithographic image on its surface, and prints are obtained by applying ink to the image and transferring the ink from the master to a receiver material, typically paper. In conventional so-called "wet" lithography, ink and an aqueous fountain solution (also known as dampening solution) are supplied onto the lithographic image, which is composed of oleophilic (or hydrophobic, i.e. ink-accepting, Water-repellent) area and hydrophilic (or oleophobic, that is, accept water, repel ink) area. In so-called waterless offset printing, the lithographic image consists of ink-receiving areas and ink-non-stick (ink-repelling) areas, during which only ink is supplied to the master. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/42B41N3/08B41N3/06
CPCB41N3/08B41N3/06G03F7/423B41N3/006
Inventor P·梅森P·默滕斯
Owner AGFA NV