Developments
in Offset printing
 Offset
printing is the used
all over the world - where the inked
image is transferred from a plate
to a rubber blanket and then retransferred
to the printing surface. When used
in combination with the lithographic
process, which is based on the repulsion
of oil and water, the offset technique
uses an image carrier on which the
image to be printed obtains ink
from ink rollers, while the non-printing
area attracts a film of water. has
certain distinct advantages compared
with other modes of printing such
as – consistently sharp image
quality, easy production of printing
plates, longer life span of printing
plate, because there is no direct
contact between the plate and the
printing surface, cost-effective
as the more you print, the less
you pay per page.
Offset printing
is the most common form of high-volume
commercial printing, due to advantages
in quality and efficiency in high-volume
jobs. Besides, many modern offset
presses are using computer to plate
systems as opposed to the earlier
computer to films workflows, which
further increases their quality
of printing. More recently, has become the most favored
form of printing in packaging due
to lower quality expectations and
cheaper costs. 
During the last
decade and a half, offset printers
have strived to effectively and
efficiently combine the four basic
parameters: quality, flexibility,
productivity and environment. Printers
are processing more and more four-color
jobs and are also adapting to different
qualities of paper. By this approach,
printers and publishers are successfully
satisfying customers’ changing
needs and high quality expectations.
In response to the emerging need
to personalize newspapers and magazines
runs are getting shorter and shorter.
As a result, offset presses manufacturers
have worked to reach shorter make-ready
times. There have been remarkable
developments of offset printing
presses during the last 15 years.
Manufacturers have increasingly
automated their equipments and built
machines to achieve faster output.
Printers are under strong pressure
from the European Community to eliminate
pollution and switch over to environmentally-friendly
processes. Compliance to environment
regulations will become increasingly
important as time passes.
Advancements in
the computer to plate printing process
have produced highly satisfying
results. Improved print quality
– laser graphics are first
generation so there is no loss of
resolution. made
using film are second generation.
In addition, because the computer
to plate printing (CTP) process
requires less consumables, CTP users
are able to enjoy a number of cost
saving benefits like - reduced plate
usage (double-sided laser polymer
plates can accommodate up to four
images), elimination of film costs
– image-setter or laser film,
elimination of chemical costs –
fixer, developer, and plate toner
cartridges, elimination of supply
shipping costs and hazardous material
removal, elimination of maintenance
contracts on processing equipment.
As regards savings
in time and efficiency are concerned,
computer to plate systems offer
a number of benefits that include
- improved plate throughput –
it takes 3-5 minutes to etch a laser
polymer plate against approximately
15 minutes for a polymer plate,
full image and depth control give
consistent plates every time, .reduced
machine downtime due to avoidance
of improperly made or damaged plates,
not generating hazardous waste stream.
There is much advancement in the
.
When making a decision on the purchase
of CTP equipment, one should be
aware of the keys to the evaluation
process: laser type, software capability,
and system features.
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