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Heating magnetically orientable pigment in a printing process

A kind of printing equipment and viscous technology, which is applied in the direction of magnetic coating, printing, printing machines, etc., can solve the problems of low satisfaction of thin sheets, high-viscosity paste ink arrangement cannot be implemented, etc.

Inactive Publication Date: 2007-11-21
JDS UNIPHASE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] [10] Therefore, when attempting to print with thick, highly viscous ink pastes with magnetic flakes or particles in them, the use of standard The intaglio process and inks are less satisfactory for aligning these flakes; therefore, the alignment of highly viscous pasty inks using an applied magnetic field has not been practicable to date.

Method used

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  • Heating magnetically orientable pigment in a printing process
  • Heating magnetically orientable pigment in a printing process
  • Heating magnetically orientable pigment in a printing process

Examples

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Embodiment Construction

[0036] [28] A new process is provided for the printing of security and high value documents which allows a paste-like ink with magnetic flakes or flakes dispersed therein to be oriented in a magnetic field. The pasty viscous ink preferably comprises optical interference pigment flakes, or reflective pigment flakes, or single or multilayer diffractive pigment flakes with magnetic properties. The invention is equally applicable in any alignment method in which the flakes can be aligned in a preferred direction using any applicable force. For example, particles that move in an electric or magnetic field that can force special effect flakes in a desired direction can be used in the present invention where paste-like printing inks with flakes can temporarily reduce tack during alignment.

[0037] [29] In one example, the interference pigment is an optically variable pigment comprising a thin layer of the aforementioned magnetic material. The pigments are dispersed in a highly visc...

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Abstract

A printing apparatus and method for aligning special effect flakes is disclosed. The flakes field orientable and have an absorption band of wavelengths and a reflection band of wavelengths and are dispersed within in a viscous paste-like ink. The absorption band of the flakes is more absorbing than reflecting and the reflecting band is more reflecting than absorbing. A laser diode array is provided for generating beams of light positioned to irradiate the paste-like ink coating on the substrate so as to lessening the viscosity of the paste like ink by irradiating with light. Preferably at least 45% of the optical power of the one or more beams of light is in the absorption band of the flakes. After the flakes are heated to lessen the viscosity of the ink, a magnetic field is applied so as to orient the flakes within the ink.

Description

technical field [0001] [1] The present invention relates to a method and apparatus for selectively heating a pigment contained in an ink-bearing coating to reduce the viscosity of a viscous ink medium. Background technique [0002] [2] Gravure printing is a known printing method that utilizes a printing plate that has depressions formed in printed image areas relative to non-printed image areas. After the entire gravure printing plate is filled with high viscosity ink, the ink in the non-printed image areas is wiped off to leave ink only in the printed image areas. Thereafter, the web or substrate, such as cardboard, is pressed directly against the printing plate under heavy pressure to transfer the ink remaining in the printed image areas to the paper. Line-engraved intaglio printing is commonly used for printing security documents such as banknotes, and uses printing cylinders having engraved engravings in them in which intaglio printing inks have been deposited. The hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M1/00B41M3/00B41M7/00C09D11/02C09D7/12C09D5/23C09D5/29B44F1/08B41F23/00B05D3/14B05D5/06
CPCB05D3/06B05D3/067B41M7/009B41M7/0027B05D3/14B41M7/00B05D5/06B05D3/207
Inventor 埃里克·威廉·科曼
Owner JDS UNIPHASE CORP
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