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Techniques for transferring holograms into metal surfaces
| Details |
Inventors: Schaefer, Mark W.; Levendusky, Thomas L.; Sheu, Simon; Larsen, Robert B.; Whittle, Neville C.;
Assignee: Aluminum Company of America (Pittsburgh, PA)
Primary Examiner: Echols; P. W.
Assistant Examiner:
Attorney, Agent or Firm: Brownlee; David W., Levine; Edward L.
A method for impressing holographic images or holograms in the surface of metal objects such as aluminum cans. The surfaces of metal shims and print rolls bearing holograms are hardened as by coating them with thin amorphous diamond coatings or diamond like coatings so the holograms can be embossed into many thousands of metal objects with clarity and consistency. |
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DETAILED DESCRIPTION The present invention meets the above-described needs by providing a process for producing a master die that can be used to manufacture many thousands of high quality decorated aluminum cans, can ends or other metal products at high speeds.
The cost of decorating aluminum cans, can ends or other metal products by this invention is nominal and is economical for mass marketing of the products.
This invention can be used for decorating a variety of metal products such as bright metal used in automotive trim, truck panels, truck tool boxes, memory discs, lighting sheet, and metal desks, among other things.
This invention uses a positive nickel shim having a holographic pattern in it, which is produced by conventional methods, to manufacture multiple master dies for decorating metallic products.
The master die may be in the form of a print roll or flexible sheet metal into which the holographic pattern is transferred.
The master die may also be a shim having sufficient surface hardness to transfer a holographic image to hard sheet metal.
The master die is made of metal having a suitable hardness relative to the nickel shim in order to make a high quality transfer of the image from the shim to the master die.
It is preferred that the nickel shim have a hardness which is at least about 2.
5 times the hardness of the material at the surface of the master dies.
If a nickel shim is used as a master die, the shim should have a hardness of at least about 2.
5 times the hardness of the article to which the image is to be transferred.
Following transfer of the pattern from the shim to the master die or dies, the surface of the dies are hardened as for example by putting an amorphous diamond coating (ADC) or a diamond like coating (DLC) on them.
The coating is very thin and of uniform thickness to minimize possible adverse effect on the clarity of the holographic pattern, while being thick enough to provide the requisite hardness for embossing many thousands of cans, can ends or other articles
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