Daily Archives: 02/08/2018

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Lets talk about Digital Printing



What the video is about

The video talks about Digital Printing .

Brought to you by Varick Street Litho Digital Printer

Their new york address , 121 Varick St, New York, NY 10013, (646) 843-0800. Facebook.


unlike a traditional printing press the
digital press does not need printing
plates every sheet is printed
individually directly from an electronic
image this allows the digital press to
deliver individual pages of personalized
content within a run very short print
runs or even one-off publications to
order and at extremely short notice with
no make ready downtime there are several
different technologies for creating
digital print and we will demonstrate
the principles first on a sheet fed
laser press and then on a high-capacity
inkjet web press the laser press
operator cleans and then calibrates the
press at the start of each shift
once the press has been correctly
calibrated for any fine adjustments to
the print quality of customers jobs will
primarily be made in a digital artwork
and not on the press itself a cube jobs
on the design studio arrives as proofed
and print-ready PDF files and the press
operator rips these files into color
separations and page layouts for each
publication the `digital prints nyc uses toner rather
than ink in the four CMYK colors this is
a powder so fine that at first sight it
looks exactly like a liquid at the
center of each built unit is a final
polished coated metal drum a laser
writes the image for each color
separation as a pattern of electrostatic
charge onto the surface of the drum
these tiny points of electrostatic
charge left toner from each color tray
and hold it on the surface of the drum
as the paper passes around the drum the
toner sticks to the paper each color
being deposited in turn the image is now
but the toner powder could easily be
brushed off so a heated chamber melts
the toner powders and fuses them onto
the paper surface
once one side of each sheet has been
printed it can immediately be turned and
fried back into the print units to print
the second side each paper drawer is
loaded with different grades of paper
each print job may be programmed to use
different paper weights or services for
individual pages within that job this
color inkjet web press creates a hundred
percent variable print content at a full
press speed of over a hundred meters per
minute the press consists of four units
a web in feed
the press itself containing the print
engines and ovens a calibration control
station and either a web out feed or a
finishing unit the press operator loads
a new roll of paper and splices this to
the existing web so it can be pulled
into the press
the operator then runs a calibration
test to align the web adjust the tension
and calibrate the color density of the
printer once this is complete no further
adjustments are required during the run
because every page of artwork may vary
jobs are fed to the press by a powerful
print server which rips the artwork to
individual colors as the press runs the
semi-circular press housing contains to
print engines one for each side of the
paper the inkjet printer fires micro
droplets of ink at high velocity onto
the surface of the paper as it passes
the print heads each printhead uses
multiple nozzles to address each pixel
at a resolution of 1200 muscles per inch
an array of five overlapping print heads
covers the width of the paper web which
can be scaled up on larger presses to
get the best color saturation of the
printed image there are six printhead
depending on the type of paper a bonding
agent may be applied to the printed area
first to achieve the highest image
quality then to erase a black print
heads create solid high density blacks
cyan and magenta are printed together
again twice to optimize color density
and finally yellow as in an offset press
with such a fine ink droplet resolution
the inks have to be ultra pure each
water-based pigment is circulated in a
continuous stream between the print
heads and the reservoir drama by a set
of pumps at the start of the run the web
runs up to speed and the print heads
move down to their operator distance
close to the pavement surface tension
wall is ensure that the paper web is
accurately aligned as it enters the
first print engine the wet ink on the
first side of the paper is dried by a 2
meter vertical oven more tension rollers
align the web as it enters the second
print engine and another oven dries the
ink on the reverse side of the web the
printed paper web leaves the press and
passes through the inline process
monitor where cameras with color
filtered lights validate the front to
back print alignment and synchronization
and the calibration of the print heads
the yellow notches on the quality bar
notify the operator of any nozzle issues
that may affect print quality paper
entering the press has a moisture level
of around 5% but passing through the to
drying ovens reduces this to below 3%
for some applications an optional
remoisturize ii unit can restore the
original moisture level before the paper
is wound onto the outfeed or passes onto
a finishing unit
Digital laser and inkjet presses from new york digital printing have
grown from their desktop computer
origins to become mature technologies
offering commercial printers versatility
speed and personalization opportunities
that complement traditional offset life