PRODUCTION & TECHNOLOGY
In a holographic Master all the characteristics of the hologram will be set up. Some attributes like effects and security features are described on the page Hologram-Design.
With the technology of Dot-Matrix-Mastering it`s possible to imprint computer-generated files, be it pictures, vector-graphics or even film-sequences in a holographic film. In this kind of exposure the silver-halide is exposed point by point with a laser and shows the image of the origin. The standard-resolution is some thousand dpi. The highest resolution is around 120.000 dpi. The single dots reflect the light in different angles which were calculated individually previously.
With special exposure units it´s possible to reach much higher resolutions that you can´t see with naked eye or high magnification. An Electronic Beam Exposure enables nano-structures of 1/100.000 millimeter and is the king class in holographic mastering.
Analogue exposure of a real object
The principal is always the same: The laser-beam is parted over a so called beam-splitter in two single rays and with different lenses and mirrors deflected that one beam the "reference-beam" is impacting directly the holographic film (siver-halide) and the second beam, the "object-beam" hits the object standing in front of the film. The interference of the two beams which are captured on the film correspond exactly to the light which reflects from the object when looking at it with eyes. It is a 100 % exact copy from the surface of the object.
After developing the film you can see the exact 3-dimensional image with illuminating the hologram from the same angle like the reference beam. Depending on the angular size the object turn on it´s own axis and the hologram can be seen from all sides.
Real Colour Hologram-Prints
Origin is a computer generated 3D-file which is exposed in a film like in classic holography. In this special and worldwide unique technic the image is not changing the colours through the rainbow, but it keeps it´s original colours and it´s possible to show up to 10 different images in one single print with a morphing or switch effect.
Development of a holographic relief structure with a photoresist
For the industrial reproduction a holographic relief is the most appropriate. To create this structures the transmission-master must be copied in a photoresist. In the following production steps the necessary relief structure raises in relation to the partial intensity of exposure (interference-pattern)
The relief-structure is perfectly suitable to produce embossing shims made out of hardened metals with very resistant surfaces which are used to press the structure into the required substrate. Usually into a plastic like PET, OPP, BOPP, PVC or coated paper. With a special technic it´s also possible to transfer a hologram directly into other metals (like gold or silver).
Embossing Shims and Recombining
To reproduce holograms in big quantities embossing shims with different properties are requested. At this point the single motiv is recombined in a special size for production sheets to achieve optimal capacity in the following production process.
Here it´s possible to add passer- or cutting-marks to the shim. In the conventional recombining-process the target is to get an embossing shim which can be used in so called wide-web or narrow-web machines. The plates will be placed around a cylinder where on the meeting point a "shimline" results, which is no problem for single motives but is disturbing for continuous pattern and raise problems in the further downstream production like for example lamination-processes in packaging machines.
Through a revolution in manufacturing embossing shims, now it´s possible to produce seamless embossing cylinders. This innovation brings a new upswing into the world of holography, because the standard equipment of the big industries can handle this seamless foils much better and more efficient.
A selection of our available standard patterns can be found on the page:
HoloDimensions - The Spirit of Light • In de Butz 4 • 22967 Tremsbüttel / Germany • Tel.: +49 (0)4531 89 70 317 • Email: email@example.com
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