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Method of Printing Utilizing Magnetic Inks

IP.com Disclosure Number: IPCOM000097743D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Mason, RK: AUTHOR

Abstract

Magnetic images 20 are produced on the surface of a magnetic drum 16 by a record head 21. Magnetic particles 24 in a hopper 23 are applied to the surface of drum 16 by impression roller 22. Excess particles 24 are collected by container 25 and returned to hopper 23. The developed magnetic images 19 are transferable to a card 11 or the like by pressure roller 18. Excess particles remaining on the surface of drum 16 are removed by the cleaning brush 26 and the magnetic image erased by erase element 27.

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Method of Printing Utilizing Magnetic Inks

Magnetic images 20 are produced on the surface of a magnetic drum 16 by a record head 21. Magnetic particles 24 in a hopper 23 are applied to the surface of drum 16 by impression roller 22. Excess particles 24 are collected by container 25 and returned to hopper 23. The developed magnetic images 19 are transferable to a card 11 or the like by pressure roller 18. Excess particles remaining on the surface of drum 16 are removed by the cleaning brush 26 and the magnetic image erased by erase element 27.

The imprint 19 formed on the surface of card 11 is formed with a dry ink consisting of finely divided magnetic particles coated with or carrying particles of a soluble dye material. A permanent nonmagnetic image is formed on card 11 by removing the dye material from the magnetic particles and removing the magnetic particles from the print medium.

A suitable magnetic ink is carbonyl iron powder having a particle size from 20 to 150 microns. A water soluble organic dye, such as methylviolet 3B, is mixed with the iron particles or is coated on the medium. A spray mechanism 28 applies solvent to remove the dye particles from the magnetic particles forming a dye imprint on the surface of card 11. Heat is applicable with an incandescent lamp 30, after which the magnetic particles are removed by brush 31. The dye printed cards 11 are then fed by rolls 13 to a receptacle 14.

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