Flat printed element capable of infrared laser imaging and making method for said printed element and imaging method thereof

A technology of lithographic printing and imaging methods, applied in the field of preparing lithographic printing plates, wet lithographic printing plates, wet lithographic printing machines, and printing plates

Inactive Publication Date: 2005-01-05
压缩技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Expensive devices are often required to

Method used

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  • Flat printed element capable of infrared laser imaging and making method for said printed element and imaging method thereof
  • Flat printed element capable of infrared laser imaging and making method for said printed element and imaging method thereof
  • Flat printed element capable of infrared laser imaging and making method for said printed element and imaging method thereof

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Experimental program
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preparation example Construction

[0063] Thus in one embodiment of the method of making a wet lithographic element of the present invention, the hydrophilic layer comprises a crosslinked polymeric reaction product of a hydrophilic polymer and a first crosslinking agent. Suitable hydrophilic polymers for crosslinking the polymeric reaction product include, but are not limited to, polyvinyl alcohol and cellulose. In a preferred embodiment, the hydrophilic polymer is polyvinyl alcohol. In one embodiment, the first crosslinking agent is a zirconium compound. In one embodiment, the first crosslinking agent is ammonium zirconyl carbonate. In a preferred embodiment, the first crosslinking agent is ammonium zirconium carbonate, and the amount of ammonium zirconium carbonate is greater than 10% by weight of polyvinyl alcohol, and more preferably 20-50% by weight of polyvinyl alcohol. %weight. In another preferred embodiment, the hydrophilic layer further comprises a second crosslinking agent. In one embodiment, the...

Embodiment 1

[0112] A kind of sheet base of the lithographic printing plate that has one deck hydrophilic insulation layer of the present invention, as the application figure 2Layer 104, shown in , is produced on a production line by coating a grained, anodized, and siliconized aluminum plate. The hydrophilic insulating layer has the following composition on a dry weight basis.

[0113] AIRVOL 325

4.28

BACOTE 20

1.75

GLYCEROL

0.17

TRITON X-100

0.07

BYK 333

0.10

[0114] AIRVOL 325 is a highly hydrolyzed grade of polyvinyl alcohol manufactured by Air Products & Chemical, Inc. BACOTE 20 is a Magesium Elektron, Inc. of Flemington, NJ containing 20% ​​ZrO 2 A stable alkaline aqueous solution of ammonium zirconyl carbonate. TRITON X-100 is a hydrocarbon surfactant manufactured by Rohm & Haas. BYK 333 is a trademark for a silicone surfactant manufactured by Byk Chemie USA of Wallingford, CT.

[0115] The above ingredients ...

Embodiment 2

[0117] Such as figure 2 As shown, a two-layer wet lithographic printing plate was made by coating an ink-absorbing and infrared-absorbing layer of the following composition onto a hydrophilic barrier-coated aluminum support made as described in Example 1. Example 2A is a comparative example representing a wet lithographic printing plate imaged only by an ablative imaging process. Examples 2B to 2F are examples of lithographic printing plates of the present invention.

[0118] 2A

2B

2C

2D

2E

2F

AIRVOL A325

25.3

14.3

12.7

14.0

6.9

6.2

CYMEL 303

4.3

0.6

0.6

2.0

1.0

0.9

WITCOBOND 240

0.0

0.0

12.7

4.1

2.0

1.8

JONCRYL 540

0.0

0.0

0.0

0.0

50.6

45.5

Binder Subtotal

29.6

14.9

26.0

20.1

60.5

54.4

BONJET CW-1

53.1

6...

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Abstract

Provided are methods of imaging a wet positive working lithographic printing member comprising a substrate, a hydrophilic layer, an infrared-absorbing layer, and, optionally, an ink-accepting surface layer; exposing the printing member to infrared layer removing by ablation greater than 10% by weight, and most preferably none of ablation; and removing with water the laser-exposed areas of the infrared-absorbing layer and optional ink-accepting surface layer to reveal the underlying hydrophilic layer. These methods are advantageous in reducing airborne debris and vapors during laser imaging, in increasing the speed of laser imaging, and in providing excellent cleanability and image quality. The printing member may further comprise a primer layer with an adhesion-promoting agent. Also provided are methods of preparing the member and members.

Description

technical field [0001] This invention relates generally to lithography, and more particularly to a system for preparing lithographic printing plates using digitally controlled laser output. In particular, the present invention relates to a method for preparing lithographic printing plates, especially suitable for direct imaging and utilizing a wet lithographic printing press. The invention also relates to wet lithographic printing forms prepared according to these methods. Background technique [0002] Conventional techniques for imprinting a printing image on a recording material include letterpress printing and offset printing. Both printing methods require printing plates. To transfer the ink in the image pattern, the printing plate is usually loaded on a cylinder of a rotary printing press to act. In letterpress printing, the pattern of an image is represented on a plate in the form of raised areas, and the raised areas receive ink and transfer it to a recording mediu...

Claims

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Application Information

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IPC IPC(8): G03F7/11B41C1/055B41C1/10B41N1/14G03F7/00G03F7/20G03F7/36
CPCB41C2210/02B41C1/1033B41C2210/08B41C2201/02G03F7/20
Inventor T·P·罗尔克R·J·德尔马托T·J·敦利
Owner 压缩技术公司
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