The document explains the operation of a dampening system used in printing, which transfers a water-based fountain solution to the printing plate to create ink-repellent non-image areas. It details the components of the dampening unit, including four main types of rollers: fountain, ductor, oscillator, and form rollers, along with the function of each roller in the process. The system ensures even distribution of the dampening solution to the plate cylinder through a controlled mechanism involving speed variations and oscillation.

1. OPERATING THE DAMPENING
SYSTEM

2. Presented By:-
Sriganesh Sankar (116A4021)
Vinay Vilas Thakur (116A4024)
From students of S.I.E.S Graduate School
Of Technology,Nerul

3.  The system that transfers a water-based fountain
solution to the printing plate as a means of making
non-image areas which is ink repellent.
What is dampening system?? And
how does it look??

4.  The dampening unit consists generally of 4 or more
rollers.
 But the 4 main types of roller used are
1) Fountain roller
2) Ductor roller
3) Oscillator roller
4) Form roller
Dampening unit

5.  The head of the dampening unit has a fountain pan
(also known as water pan),which is the reservoir for
storing the water.
 The fountain pan also consists of a fountain roller
which is responsible for transferring a thin film of
water solution on to the ductor roller.
 The speed of the fountain roller is comparatively
slower than that of the press so as to prevent the
spraying of dampening solution.
 The ductor roller transfers a metered amount of
water solution on set intervals by alternately
contacting the fountain roller and the oscillator roller.
Working of the dampening unit

6.  The oscillator not only transfers fountain solution
from the ductor roller to the form rollers, but also
oscillates back and forth parallel to the ductor roller,
so as to even out fountain solution distribution across
the dampening system and ensure the transfer of
solution uniformly across the surface of the plate.
 The form roller is responsible to transfer the metered
amount of dampening solution from the oscillator to
the plate cylinder on the non image areas.
 https://www.youtube.com/watch?v=mvDFqB6nj1Q

7. THANK YOU!!