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Method of printing on layer with stable radical photoinitiator

A photoinitiator and free radical technology, which is applied in post-processing of printing, printing of special varieties of printed matter, printing, etc., can solve problems such as dehumidification, inkjet ink not too firmly attached, and lack of visual uniformity

Pending Publication Date: 2021-05-11
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When printing with UV-curable print media and especially with UV-curable inkjet inks, there is a known problem of overprinting of hardened layers After the UV-curable inkjet ink has been printed on the substrate and has cured, overprinting with additional UV-curable inkjet inks often leads to dewetting problems
[0006] A further known problem when printing with UV-curable inkjet inks is that such UV-curable inkjet inks tend to shrink during the curing process, which results in: cured UV-curable inkjet inks will adhere less firmly to the substrate
Here, the well-known problem arises that the adjoining areas of the strips arranged next to each other or slightly overlapping often do not have perfect visual uniformity, especially when printing large monochrome surfaces

Method used

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Embodiment Construction

[0031] In a preferred embodiment, the first layer is printed onto the substrate in step ii) in a full-surface manner, and at least one further layer is printed in step iv) by means of inkjet printing in at least two mutually adjoining or overlapping layers. Printed in the form of continuous strips onto the at least partially hardened first layer which has been applied all over the substrate. "full face ” here means that at least that side is printed in a first layer which is printed in a strip in a subsequent step.

[0032] Another subject-matter of the invention is the use of an at least partially hardened layer on a substrate as a basis for printing at least two strips from a UV-curable inkjet ink by means of inkjet printing The at least partially hardened layer comprises at least one compound that is or forms stable free radicals, wherein the at least two strips adjoin or overlap each other, and the UV-curable spray Ink The ink is substantially free of photoinitiators. ...

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PUM

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Abstract

The invention relates to a printing method in which a first at least partially hardened layer is overprinted, the first layer comprising at least one compound which is a stable radical or which forms a stable radical. The at least one further layer resulting from overprinting advantageously adheres to the first layer. If the at least one further layer is applied to the first layer by means of inkjet printing in the form of tracks, the optical inhomogeneities in the track connection areas can advantageously be reduced.

Description

technical field [0001] The invention relates to a printing method in which printing is performed on a layer comprising at least one compound which is or forms a stable free radical; The use in the web connection of printed strips and the invention also relates to the use of the method for improving the adhesion of UV-curable inkjet inks to substrates. Background technique [0002] In the printing industry, different printing methods are known in principle, for example: offset printing, screen printing and inkjet printing. As printing media, in these printing methods, in addition to solvent-based printing media (wherein the solvent is often water), also UV-curable printing media are used, for example: UV-curable printing inks or UV-curable spray inks. Ink ink. Usually, such a UV-hardenable printing medium is first applied in a printing press to a substrate (where, for example, paper, cardboard or plastics may be involved) and, in one or more subsequent steps, exposed to UV ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M5/00B41M7/00C09D11/30C09D11/101
CPCB41M5/0023B41M7/0081C09D11/30C09D11/101B41M5/0017B41M5/0047B41M3/008
Inventor M·施勒霍尔茨
Owner HEIDELBERGER DRUCKMASCHINEN AG