Cd Dvd Replication
Are you searching for Cd Dvd Duplication?
Give us a call at 888-CDS-DVDS for a competitive quote on your project.
Networked CD Dvd Publishers
:
Cd Dvd Replication
featuring a variety Packaging Options.
We have a huge selection of quality CD and DVD accessories.
The first stage in producing CD and DVD discs is injection moulding, which
uses the stamper to create the plastic discs or substrates containing the
pits. Optical grade polycarbonate is first 'baked' to remove any moisture
and is injection moulded in a high pressure moulding machine (press) using
the stamper mounted in the mould fixed to the press. This mould is in two
parts and provides a cavity which ensures that perfectly moulded discs are
produced with the correct dimensions every time. One half of the mould
contains the stamper while the other half contains the mirror block to
ensure a smooth surface. The hydraulic press applies a force to the two
halves of the mould which are closed. Molten polycarbonate is then injected
into the cavity and held in place by the applied pressure while the disc
cools and solidifies. During cooling the centre hole is punched. After
cooling, the press opens and the pressed disc is transferred by robot arms
to a conveyor to allow the disc to cool before the next stage. The center
hole with sprue (formed by the injected polycarbonate) is discarded or
recycled. Successful moulding of CDs which meet the CD specification,
requires stable processes with the machines setup correctly. Molding
parameters which can affect the resultant CD include stamper geometry,
mold temperature, polycarbonate temperature, compression force and cycle
time. Cycle times for injection moulding of CDs have decreased alot and
are now around 3 seconds for the latest presses and molds.
DVD molding is similar to CD moulding but with some important differences.
Two pressings are needed for each final DVD disc Each half disc is 0.6mm
thick instead of 1.2mm The thinner disc also requires different molding
parameters, such as a shorter injection time and higher mould temperature.
Redesigned or new molding machines are needed with injection compression
where the mould is kept slightly apart until most of the polycarbonate
has been injected. Cycle times tend to be longer than for CDs. The
quality of the final disc, including tilt and jitter, is critically
dependent on the molding process.
The major feature of the md is that it allows the consumer
to record music. In a cd-rw disc, the reflecting lands and non-reflecting
bumps of a conventional cd are represented by phase shifts in
a special compound. While this isn't some sort of secret conspiracy,
many of these companies are reluctant to reveal their oem information.
The surface of the cd is a mirror, and the bumps disrupt the
mirror's perfect surface.
More about Cd
Dvd Duplicators. See also: Thermal Printer Ribbons
and Dvd Media
Packaging.
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