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Non-alkaline developing violet laser photopolymerizable lithographic printing plate and its developing method

A lithographic printing plate, non-alkaline developing technology, applied in printing, printing technology, photosensitive materials used in optomechanical equipment, etc., can solve the problem of strong corrosive alkaline developing solution, unfavorable operation and poor printing durability of the plate and other problems, to achieve the effect of good developing effect, good inking performance, and not easy to get dirty

Active Publication Date: 2016-08-17
LUCKY HUAGUANG GRAPHICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of alkaline developer has two main disadvantages: 1) the strong corrosiveness of alkaline developer is not conducive to operation; 2) alkaline substances and CO 2 And the neutralization reaction of the acidic compound in the coating causes the alkaline attenuation of the developer, which has a direct impact on the imaging stability of the printing plate, so it is necessary to maintain the alkaline stability of the developer through complex supplementary methods (as announced in US7024996) Method and equipment for keeping developer alkaline and stable)
Although the development methods used by the two are more environmentally friendly and less polluting than the traditional method, the printing durability of the plate is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] [Production of photopolymerizable lithographic printing plates]

[0109] An aluminum coil in which a 0.30 mm-thick aluminum plate (support) was curled into a roll (coil) was fixed to a feeder. In the surface treatment part, 10% sodium hydroxide is used to immerse the aluminum plate continuously sent out from the sender at 70°C for 60 seconds, after etching, wash it with running water, and wash it with 20% HN0. 3 Perform neutralization washing and water washing. Under the condition of VA=12.7V, use the alternating waveform current of sine wave, in 1% nitric acid aqueous solution at 300 coulomb / dm 2 The electrolytic surface roughening treatment is carried out on the electric current of the anode. The surface roughness thereof was measured and found to be 0.6 μm (expressed as Ra).

[0110] followed by immersion in 30% H 2 SO 4 In aqueous solution, after decontamination at 55°C for 2 minutes, at 33°C in 20% H 2 SO 4 In the aqueous solution, the cathode is arranged on...

Embodiment 2

[0129] In Example 2, a photopolymerizable lithographic printing plate was produced in the same manner as in Example 1, but an undercoat layer was added between the base and the photosensitive layer.

[0130] (Liquid composition for primer)

[0131] Polyvinyl alcohol (Air Products, PVA540) 0.2 parts by weight

[0132] Deionized water 99.8 parts by weight

[0133] Heat the liquid paint with hot air, heat it at 80°C for 2 minutes, and apply it to the above-mentioned treated aluminum plate to reach 0.1g / m 2 , drying until the aluminum temperature reaches 70°C, and then cooling until the aluminum temperature reaches below 50°C.

[0134] On the undercoat layer thus obtained, a high-sensitivity photopolymerizable composition and a protective coat layer are coated.

[0135] The plate material is developed with the developer solution of Example 1, and the exposure, development, and inking are the same as Example 1. Development was fast and the inked plate showed good ink receptive ...

Embodiment 3

[0137] In Example 3, a photopolymerizable lithographic printing plate was produced in the same manner as in Example 1 except that the composition of the photosensitive layer coating liquid was changed.

[0138] (Photosensitive layer coating liquid composition)

[0139] Polymer NB-728 (ZENECA company) 2.73 parts by weight

[0140] Acrylic monomer SR-399 (SARTOMER company) 6.52 parts by weight

[0141] Nonionic surfactant PL43 (BASF company) 0.56 parts by weight

[0142] Photopolymerization initiation system (1) (USA, Part B) 1.50 parts by weight

[0143] Modified phthalocyanine compound (1) 0.1 parts by weight

[0144] Acetone 90.2 parts by weight

[0145] Apply a protective coating on the photosensitive layer so that the dry coating weight is 2.0 g / m 2 , In the drying section, blow drying air at a wind speed of 8 m / s at a temperature of 120°C for 5 minutes to dry the polyvinyl alcohol, and then cool until the aluminum temperature reaches below 50°C.

[0146] (developer c...

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Abstract

A non-alkali-developer violet laser photopolymerization type lithographic printing plate comprises a support. A photopolymerization type photosensitive layer is arranged on the support, a waterborne protective layer is cling to the photopolymerization type photosensitive layer, and photosensitive ingredients include ethylene unsaturated group-containing compounds, single component or double-component or multi-component initiator systems, colouring agent and the like. Exposed areas of the violet laser photopolymerization type lithographic printing plate are cured, and unexposed areas are removed through non alkali developer in a developing manner. The PH value of the non-alkali developer ranges from 2 to 9.

Description

technical field [0001] The invention relates to a lithographic printing plate with a violet laser photopolymerization photosensitive coating formed on an aluminum plate base, in particular to a photopolymerization lithographic printing plate that can be directly plate-making with a violet laser, and uses a non-alkali Development processing with non-toxic developer. Background technique [0002] As an important branch of functional polymers, photosensitive polymer materials have been widely used in many fields, such as electronics industry, printing industry, ink industry, coating industry, as well as recording materials, adhesives and medical materials. Compared with other recording materials such as silver halide gelatin, dichromate, etc., photosensitive polymer materials have the characteristics of high resolution, stable imaging, low cost, and convenient processing. One of the most important application fields of photosensitive polymer materials is the printing industry,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41N1/08G03F7/00G03F7/30G03F7/004G03F7/027
Inventor 李永燕王泳李旭东孙伟涛王晓平马天如郭伟峰
Owner LUCKY HUAGUANG GRAPHICS
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