Description Of Unit; Airless Process; Functioning Of The Unit - WAGNER Finish 270 Operating Manual

GB
general vIew of applIcatIon
3.

deScRIPtIOn OF unIt

3.1

AIRleSS PROceSS

The main area of application are thick layers of highly viscous
coating material.
At the Finish 270 / 250 unit a diaphragm pump takes in the
coating materials and transports it via a high-pressure hose
to the spray gun with the airless tip. Here the coating material
atomizes since it is pressed through the tip core at a maximum
pressure of 25 MPa (250 bar, 3625 psi). This high pressure has
the effect of micro fine atomisation of the coating material.
As no air is used in this process, it is described as an AIRLESS
process.
This method of spraying has the advantages of finest atomi-
sation, cloudless operation (depending of a correct unit ad-
justment) and a smooth, bubblefree surface. As well as these,
the advantages of the speed of work and convenience must
be mentioned.
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3.2

FunctIOnInG OF tHe unIt

The following section contains a brief description of the tech-
nical construction for better understanding of the function:
Finish 270 / 250 is an electrically driven high-pressure paint
2
spraying equipment.
The motor (Item 1) drives directly the hydraulic pump.
A piston (2) is moved up and down so that hydraulic oil is mo-
ved under the diaphragm (3) which then moves.
In detail:
3
The downwards movement of the machine opens the disk in-
let valve (4) automatically and coating material is sucked in.
During the upwards movement of the diaphragm, the coating
material is displaced and the outlet valve opens while the inlet
valve is closed.
The coating material flows under high pressure through the
high-pressure hose to the spray gun and is atomized when it
1
exists from the tip.
The pressure control valve limits the set pressure in the hy-
draulic oil circuit and thus also the pressure of the coating
material.
A pressure change when the same tip is used also leads to a
change in the amount of paint atomized.
4
Finish 270 / 250
3 2 1