Printed Film
Hologram is a two or three dimensional photographic image
produced by laser light. It was discovered by Gabor. The term
hologram was coined from the Greek words holos, meaning "whole,"
and gramma, meaning "message." The process by which the
image is recorded is called holography.
A hologram contains information about the size, shape, brightness
and contrast of the object being recorded. This information is
stored in a very microscopic and complex pattern of interference.
The interference pattern is made possible by the properties of light
generated by a laser.
Laser light is used more often because the light from a laser is of
one color and leaves the laser with one wave in perfect step with
all others. Such a light that is highly directional and of one
colors is called coherent.
The hologram presents a true three dimensional recreation of the
original object when re-illuminated and viewed under normal light.
For the observer, the perception of depth is virtually
indistinguishable from reality.
Holograms are available in assorted styles and types. Each hologram
requires it's own individual technique for production. Some
holograms require a laser to view them, others rely only on regular
light. Some holograms show motion, and some change images as you
move by them. Holograms can be in full-color, change color and even
project their image out in space toward you when you view them.
Properties of Holograms
- Sensitivity to vibration - Holograms record
specific information about light at the level of individual
light waves. Thus, the holographic plates are sensitive enough
to record a single wavelength of light, 650 nm for red laser
light.
- Divisibility - A hologram can be divided
into small pieces that still retain the entire image of the
object. The object's wavefront is preserved throughout the
hologram, and can be viewed from a tiny piece of the whole.
Applications of Holograms
- Art, science and technology
- Used on certain product packaging
- Used for labelling
- Embellishment on printed media
- On credit cards and driving license to help stop
counterfeiting
- Used in airplanes to provide the pilot with critical
information
- Also used for artistic expression
- Security applications
Know More About Holograms
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A film is a synthetic resin adhesive, with or without a film
carrier fabric, usually of the thermosetting type, in the form of a thin
film of resin, used under heat and pressure as an interleaf in the
production of bonded structures.
Printed film used for packing, is a film with a display of printing,
lithographing, embossing, stickers, seals, or other written, printed or
graphic matter. These are leak proof films.
Specifications
Packaging products require a specific range of coefficient of friction
(COF) to allow automatic packaging operations to run unhindered and to
prevent the package from sliding during storage.
When an ink or coating is applied to a film, the COF of the printed
film usually is higher than the film itself. The printed film COF will
drop over time as the slip agents distribute themselves within the film
and ink layer. If the printed film has retained solvent, this will cause
a higher COF. As the ink dries, the COF will drop. The presence of
retained solvent also can increase the migration of slip agents.
The consumption of printing films is growing for stretch and heat
shrink sleeve labels, which make attractive and low-cost-temper evident
seals.
Applications
- Typical applications of these printed films include:
- Preformed bags for bread, rolls, specialty breads, tortillas
- Printed roll stock for fruits, vegetables and potatoes
- Preformed bags for vegetables and meat and poultry products
- Preformed round bottom bags for fresh poultry
- Preformed bags for apples, oranges, potatoes and carrots
- Printed roll stock for retail size package of sugar
- Printed polyethylene laminate roll stock for rice
