Modern printing technologies

Modern Printing Technologies.

1. Welcome
To
Modern Printing Technologies
Course Instructor:
MD: ALI HOSSAIN
Jr. Instructor (tech).
Graphic arts institute. Dhaka-1207.
E-mail: [email protected]
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Watch out……….

3.  Major Printing Processes.
Working Procedure in the Major printing
Processes.
 Modern Printing Technologies.
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Major Printing Processes.
 Relief Printing Process.
 Intaglio Printing Process.
 Offset Printing Process.
 Screen Printing Process.

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Relief printing is a method used to make multiple
images, in which ink is transferred under pressure to
paper or another support by the raised parts of a
prepared printing block, surface or texture.r 'o Ao(r%PAghAg"r%PdMocci
Relief Printing Process.

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Relief printing process contd..
Fig: Image Carrier of relief printing

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Printing Process in which ink is retained in the recessed
areas of the printing plate (which is wetted and wiped
before every impression) before being transferred
to paper or other printing surface. Gravure printing is an
intaglio process.

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Intaglio printing process contd..
Fig: Intaglio printing process.

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Definition: Offset lithography is a process used for
printing on a flat surface, using printing plates. The plate
is then chemically treated so that only image areas
(such as type, colors, shapes etc.) will accept ink. The
plate is then rolled onto a rubber cylinder applying the
inked area, and in turn the rubber cylinder (or "blanket")
applies the image to the paper.0((cohr%PAghAg"r%PdMocc
Offset Printing Process

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Screen Printing Process.
Screen Printing is a process, where ink is
mechanically applied to a substrate with the use of a
screen and squeegee.

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Screen printing process contd...

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MODERN
PRINTING
TECHNOLOGIES .

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Flexography
The modern letterpress

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Basic parts of the press
Unwind and infeed section- The roll of stock must
be held under control so the web can unwind as
needed
Printing section- Single color station including the
fountain, anilox, plate and impression rolls
Drying station- High velocity heated air, specially
formulated inks and an after-dryer can be used
Outfeed and rewind section- Similar to the unwind
segment, keeps web tension controlled.

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Flexographic Presses
Stack press
Color stations stack up
vertically, which makes
it easy to access. This
press is able to print on
both sides of the
substrate.
Model NO. FKFS 20 30 40 STACK TYPE
Application OPP. PP. PE. WOVEN BAG. PAPER etc.
Printing Speed. 2~4 COLOR CYLINDERWIDTH *320~1000 6~
COLOR CYLINDER WIDTH*320~800

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Flexographic Presses
Central Impression
press
All color stations are
located in a circle
around the impression
cylinder. This press can
only print on one side.
Advantage: excellent
registry

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Flexographic Presses
In-line press
Color stations are placed horizontally. This press prints on
both sides, via a turnbar. Advantages: Can print on heavier
substrates, such as corrugated boards.

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Gravure
The modern Intaglio Printing Process.

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o t : l t d M d P g c
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The Gravure Press and its The Gravure Press and its
components.components.
The image carrier, a cylinder engraved with the
image to be printed or transferred.
An ink fountain, a large ink well positioned
beneath the cylinder, extending the width of the
press unit.

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A doctor blade assembly containing a blade which
wipes excess ink from the non-image areas of the
image carrier.
An impression roller, a rubber-covered metal cylinder
which holds the substrate against the engraved image
carrier to obtain proper ink transfer.
A dryer, consisting of a control source of heated air,
regulated to provide optimum drying of inks or
coatings and remove ink carrier vapors.

22. 02/25/15 22 r i N r t o l N g e r h
r i N r t o l N g e r h
Gravure IndustryGravure Industry
Simplest of all printing
systems.
Fastest press start up.
Very little paper waste (half the
paper waste of lithography).
Speed is extremely high.
45,000 copies an hour.

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DIGITAL PRINTING
ANALOG PRINTING
Conventional textile printing techniques
Master image present on block or screen is reproduced onto textile in the
form of print.
DIGITALPRINTING
Design is in the form of electronic file in a computer.
The computer is linked to a suitable machine e.g. inkjet printer
Design is printed onto paper or fabric in the form of analog image with the
help of color microscopic dots.

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Trends in global printing market
Digital printing technology supports the present industrial trends:
short runs at economical cost, quick delivery, exclusive unique
designs and personalized textiles.
It allows the user to bypass the extremely time consuming and
expensive screen making process, providing the opportunity for quick
changes to colour or design elements.
The conventional printing requires 6-7 weeks whereas the digital
printing requires about 2.5 weeks delivering the final printed products

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INKJET TECHNOLOGIES
•Directing small droplets (usually between 50 and 60 microns in diameter), of ink from a
nozzle onto printing substrate.
•The droplets can have different colors.
•Droplets are combined together on the substrate to create photo-quality images.
•Positioning of droplet is controlled by high frequency digital signals from computer.
•Droplet formation involves application of a controlled pressure on liquid ink in its reservoir
as it streams into the printing nozzles the ink stream is broken into droplets.
•Different technologies for application of pressure on liquid ink.

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INKJET TECHNOLOGIES
•two main technologies
• Both technologies use large number of nozzles (10-100 Micron dia,) for each
colour (CMYK)
• Between 1000 to million drops processed per second.
•Depth of shade is controlled by number of drops applied on substrate.

27. 02/25/15 27T i l e i C t g o i l o s g i i l e i C t g o
Advantages and disadvantages
•Advantages
•ability to cover a larger band width print area with one pass
•Higher productivity compared to single jet system
•long print head life over thermal or piezo drop on demand printers.
•Disadvantages
•High initial cost of the system
•Low resolution
•Extremely low viscosity ink (3-6 CP) and electrical conductivity.
•In general, the initial high cost of CIJ heads currently prohibit their use
for low volume applications.

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Some Digital
Printing Machine.

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Digital Offset Printing

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Digital Offset Printing contd.

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Digital Offset Printing Contd.

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Modern Screen Printing
CAROUSAL PRINTING
MACHINE
These machines will be
available both in automatic
and semi automatic
machines and with 4, 6, 8,
10 & 12 multi colour
models. The double spring
model gives the customers
a maintenance free
performance of the
machine. Electric heat
panels included in the
machine.

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Garments Printing
Flock Printing:
Tiny particles of fiber are made to adhere to a fabric surface in conformance
to a particular design. Rayon and nylon fibers are typically used for flocking.
The ability of flocked fibers to withstand dry cleaning and/or laundry depends
on the adhesive. Adhesives with excellent fastness to cleaning processes are
used.

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1.This involves printing with a chemical that will destroy the fiber in the
patterned design print area.
2. In fabrics that are made with blended yarns, the burn-out chemical
will destroy one fiber and leave the other undamaged. Unusual and
interesting fabrics can be created by this method.
Burn-out Prints

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Print some pattern with the foil on the fabric or paper for shinny effect. Foil print is the foil
paper. it is heat transfer
Chemical in use:-
Gum mix binder.
Heat press foil.
Time 10-15 sec & temp -160-165 c
Time: - 7.5 pieces/min.
Fault:-
Color shade
Design
Placement design ok
Gum mistake then foil mistake& heat problem then print problem.
Foil print:-

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Digital printing
HOW IS IT DONE?
• inkjet printers print CAD designs directly onto fabric using special printing inks.
•This is a flexible form of printing suitable for short runs and for producing fabric
samples.

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dh0r2s% Thank youThank you
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