Magnetic plate for printing of optical effects

Abstract

This invention discloses a magnet for use as a printing plate or printing head that is used for aligning flakes or particles in a paint or ink. A composite sheet or block of magnetizable material is selectively magnetized so that a magnet is formed within the sheet or block that has a shape of a predetermined image, logo, or indica. Dies are used to magnetize the magnetizable material and preferably the does contact the material to be magnetized. A pre-magnetized sheet such as a refrigerator magnet may be re-magnetized differently so that a magnetic image is encoded therein for use as a printing plate. Preferably the printing plate is flexible so that it can be formed to a curved surface of a cylinder or drum for printing. Conveniently these flexible magnets can be changed for other deisgins and placed on the same drum for use in printing.

Description

technical field

[0001] [1] The present invention generally relates to magnets having magnetically aligned particles or flakes for use in printing inks and paints, and in particular, the present invention relates to the formation of a magnet having magnetic materials aligned in a plurality of different directions depending on an applied field , and the application of the magnet as a printing plate.

[0002] [2] The term "sheet" hereafter in this specification is used to mean a flat and thin plate, and, in a preferred embodiment, is used to mean a flexible sheet; however, the term "sheet" does not mean It doesn't stop there.

[0003] [3] The term "plate" is used throughout this specification to mean a rigid or elastic plate, and includes thin and flat elastic sheets, such as synthetic magnetizable sheets or rubber magnetic sheets, which when magnetized are usually Known as "refrigerator" magnets.

[0004] [4] Hereinafter the term "printing plate" is used as a plate for formin...

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