Manufacturer of high quality equipment for powder coating
________________________________________________________________
52
condition of the insert sleeve is of great importance, because wear cau-
ses the powder output to sink drastically.
Experience with pneumatic material handling technology shows that
pneumatic transport of fine solid matter (powder) in the form of tubing
(hose) the transporting medium requires a certain volume of air per unit
of time. If a Ø 11 mm hose is used, this value is approximately 4 m³/h.
To decrease the powder output, the vacuum in the cavity has to be
reduced. For that purpose, the pressure of the conveying air is also
reduced. With the reduction of the conveying air the volume of air in the
powder hose sinks to below the optimum value of 4 m³/h. The powder
transport be-comes irregular, so-called "pumping" takes place. In order
to prevent this from happening supplementary air is added until the
volume of the air in the powder hose is 4-
5 m³/h once more. This takes
place fully automati-cally with the PROTON control unit.
Powder volume setting table for G2 injector
In order to set the ideal powder volume on the PROTON /PROTON II,
it is recommended to select the firmness of the powder cloud or the
total air first. As a guide value for different powder hoses, the following
values can be assumed:
-
Powder hose 1004, internal Ø 11 mm,
4-
5 m³/h
-
Powder hose 1005, internal Ø 12 mm,
5-
6 m³/h
According to the prevailing conditions (powder, powder hose layout, the
parts to be coated) a low to lowest total air can also be set with the stan-
dard hose 1004 Ø 11 mm.
If a very large powder output is required, it is recommended to select a
larger powder hose inside diameter (12 mm i/d).
Note:
It should be considered, that by irregular or pumping conveying,
normally the total air is set too low!
General conditions for the G2 injector
Powder type
Epoxy/Polyester
Powder hose length (
m
)
10
Powder hose Ø (
mm
)
11
Input pressure (
bar)
5.0
Conveying air nozzle Ø (
mm
)
1.6
Supplementary air nozzle
Ø (
mm
)
1.4