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Printing of radiation curable inks into a radiation curable liquid layer

A technology of radiation curing and printing methods, applied in the post-processing of printing, printing, ink, etc., can solve the problems of incomplete acquisition of ink drops, unclear images, incomplete understanding of the exact nature of ink-medium, etc.

Inactive Publication Date: 2009-09-09
AGFA NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the limitations on the arrangement of the printheads and the calculation of the dynamics required to achieve the thickness variation according to the image to be printed, it is also difficult to avoid the spreading of the primer layer from the unprinted areas, i.e. the full thickness of the primer layer to the areas printed by 100% ink , that is, the zero thickness of the primer layer, which results in a less sharp image
[0024] The spreading of the ink drop on the substrate greatly limits the resolution that can be obtained
Although coating or pretreatment techniques have been widely used to modify surface properties, the precise nature of ink-media interactions is not fully understood
Attempts are typically made to relate print quality to measurable surface parameters such as surface energy and surface roughness, but these do not fully capture the behavior of ink drops on various media

Method used

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  • Printing of radiation curable inks into a radiation curable liquid layer
  • Printing of radiation curable inks into a radiation curable liquid layer
  • Printing of radiation curable inks into a radiation curable liquid layer

Examples

Experimental program
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Effect test

preparation example Construction

[0180] Preparation of radiation curable inkjet inks

[0181] Colorant dispersions for radiation curable inkjet inks can be prepared by mixing, milling and dispersing the colorant and resin. Mixing equipment may include pressure kneaders, open kneaders, planetary mixers, dissolvers, and Dalton universal mixers. Suitable milling and dispersing equipment are ball mills, pearl mills, colloid mills, high-speed dispersers, twin rolls, bead mills, paint conditioners, and triple rolls. Dispersions can also be prepared using ultrasonic energy.

[0182] Many different types of materials can be used as grinding media, such as glass, ceramics, metals and plastics. In a preferred embodiment, the grinding media may comprise particles, preferably substantially spherical particles such as beads consisting essentially of a polymeric resin or yttrium-stabilized zirconium beads.

[0183] In the processes of mixing, milling and dispersing, each process is carried out with cooling to prevent he...

Embodiment 1

[0228] This example illustrates how the dot size of an ink droplet is controlled by thickness.

[0229] Preparation of radiation-curable liquid layers

[0230] A colorless radiation curable liquid layer composition Ink-L was prepared according to Table 1 by mixing the ingredients and stirring for one hour to ensure good distribution of all components. Weight % (wt%) is based on the total weight of the radiation curable liquid layer composition.

[0231] Table 1

[0232] wt% of the following substances Ink-L DPGDA TM 66.5 Irgacure TM 907 2.5 Darocur TM ITX 5.0 Craynor TM CN 501 25.0 Byk TM -333 1.0

[0233] The radiation curable liquid layer composition Ink-L was jetted on PET using a conventionally configured inkjet printer equipped with a UPH printhead from AGFA to produce ink receivers IR-2 to IR-7. A resolution of 360×360 dpi is used to print numerous dpd (drops per dot) as shown in Table 2, wherein 1 dpd is equal t...

Embodiment 2

[0248] In this example, the dot size of the inkjet ink jetted on the liquid layer after curing was evaluated.

[0249] Ink receiver IR-8 was prepared in the same manner as ink receiver IR-7 of Example 1, except that the radiation curable inkjet ink Ink-M was used instead of Ink-L. Ink Receptor IR-5 and Ink Receptor IR-8 of Example 1 were first cured using a Fusion DRSE-120 conveyor equipped with a Fusion VPS / 1600 lamp (D-lamp) on a conveyor belt under UV light The ink receiver was transported at a speed of 20 m / min.

[0250] On cured ink receptacles IR-5 and IR-8, 1 dpd of radiation curable inkjet inks Ink-M and Ink-C were jetted from a conventionally constructed inkjet printer at a resolution of 360 x 360 dpi. The printed samples were cured by the same procedure used to cure ink receptors IR-5 and IR-8. Radiation curable ink Ink-M was not jetted on ink receptacle IR-8 due to visual differentiation difficulties.

[0251] table 5

[0252] ink receiver Dot Diamet...

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Abstract

A printing process is disclosed for ink-jet printing a radiation curable image on a substrate (14). First a radiation curable liquid layer (12) is provided on at least a portion of the substrate (14). Radiation curable ink-jet ink droplets (10) are jetted into the radiation curable liquid layer (12) and the radiation curable liquid layer (12) containing the radiation curable ink-jet ink droplets (13) is then cured. The resolution of the radiation curable image is controlled by uniformly adjusting the thickness of the liquid layer (12) for the dotsize of the radiation curable ink-jet ink jetted onto the cured layer.

Description

technical field [0001] The present invention relates to methods of printing radiation curable inks into radiation curable liquid layers, and more particularly to high speed inkjet printing methods exhibiting high image quality. Background technique [0002] In inkjet printing, droplets of ink fluid are projected directly onto an ink receiver surface without physical contact between the printing device and the ink receiver. A printing device that electronically stores printing data and controls the mechanism that ejects ink droplets imagewise onto ink receivers. Printing can be done by moving the printhead past the ink receiver or vice versa. [0003] Ink fluids can be roughly divided into: [0004] Water-based, drying mechanisms include absorption, osmosis and evaporation; [0005] Oil-based, drying mechanisms include absorption and penetration; [0006] Solvent-based, where the drying mechanism involves permeation but is primarily evaporation; [0007] · Hot melt or ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41M1/26B41M5/00B41M7/00C09D11/00
CPCB41M7/0072B41M7/0081B41J11/0015B41J11/002
Inventor R·克莱斯R·詹森斯
Owner AGFA NV
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