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Waterless Plate (PEARLdry™ Plus)
The 3404DI uses PEARLdry™ Plus, a roll-type
waterless plate. This plate uses laser action to
form surfaces that are either adhesive or repellent
to ink. Each plate lasts for approximately 20,000
impressions, and will accommodate both short
runs as well as longer, large-lot production.
Note: The number of available plate impressions depends on
printing conditions such as the type of ink and paper
stock used.
High Printing Quality From an Offset Press
RYOBI has packed the 3404DI’s compact body with a host of
outstanding printing features. Incorporating RYOBI’s unrivaled offset
printing know-how, it features a highly reliable, robust design that
yields high printing quality and promises a long and productive
service life.
Dimensions
Compact Design Based on a Unique
Cylinder Arrangement
The 3404DI uses a satellite V-shaped 5-cylinder
system consisting of two sets of double-
diameter blanket cylinders and plate cylinders,
which rotate around a triple-diameter impres-
sion cylinder. Paper is tightly held by the
impression cylinder grippers and rotated twice
without a gripper change for precise 4-color
printing. The large diameter of the impression
cylinder reduces paper curling as well as
damage to the printed material. Thanks to this
cylinder arrangement, the RYOBI 3404DI
achieves a compact design that’s about the
same size as a conventional 2-color press.
Inking section
Ink roller temperature
control system
Three Plate Cleaning Devices
Once imaging has been completed, plate
cleaning is carried out by three devices—a dry
cleaning device, a wet cleaning device and a
vacuum, to remove residual silicone on the
plate.
Plate cleaning device (wet cleaning)
Plate cleaning device (dry cleaning)
Vacuum
1. Imaging head
2. Printing plate
3. Plate cylinder
4. Plate cleaning device
5. Blanket cylinder
6. Automatic blanket cleaning device
7. Automatic ink roller cleaning device
8. Underswing system
9. Paper feed drum
Solid, Reliable Design
The 3404DI uses a bearer contact system to
maintain constant plate pressure with each
rotation of the cylinder. Plus, induction-
hardened ultra-high-precision helical gears and
cylinders fitted with ultra-high-precision
bearings ensure consistent, stable printing
quality over long periods of use.
Ultra-high-precision helical gears are used
on the impression cylinder
Plate cleaning devices
Paper Travel
Sheets are fed one-per-rotation of the
plate and blanket cylinders. The paper
is held by the impression cylinder
(surface A). Blanket cylinder 1 prints
the first color.
Blanket cylinder 2 prints
the second color.
The paper printed with the second
color is not transferred to the
delivery section, but enters the
second rotation while being held by
the impression cylinder grippers.
During the second rotation,
blanket cylinder 3 prints the
third color on the sheet.
When blanket cylinder 4 finishes
printing the fourth color, the sheet
is delivered to the delivery pile.
3,230 mm (10'7")
1,915 mm (6'3")
720 mm (2'4")
990 mm (3'3")
2,635 mm (8'8")
1,913 mm (6'3")
1,298 mm (4'3")
1,665 mm (5'6")
Ink Roller Temperature Control System
Roller temperature is maintained at an optimum
level by circulating temperature-controlled water
(warm water and cold water) inside the oscillating
rollers and fountain rollers. By minimizing fluctua-
tions in ink roller temperature, consistent printing
quality is maintained, even during long print runs.
The triple-diameter impression cylinder
reduces paper curl
Mechanical Configuration
10. Impression cylinder
11. Decurling device
12. Suction wheel
13. Infrared dryer (option)
11-Zone Divided Ink Fountains
Ink fountains are divided into 11 zones, each
having its own motor. The ink supply volume
for each zone is remotely controlled from the
operation stand.
Inking Mechanism
Each inking unit consists of 15 rollers including
4 form rollers, ensuring uniform inking.