BUCHI Encapsulator B-390 - Manual (Page 23)

5 Putting into operation
23 B-390 Operation Manual, Version C
5 .6 Electrode
The electrode is part of the electrostatic dispersion unit. It is attached from below to the heating block.
The distance between the electrode and the nozzle tip can be changed as needed. This distance is
approximately 3 to 8 mm. It should be set so that the droplets are formed near the upper side of the
electrode.
When the beads pass through the electrode they pick up the electrostatic charge. This electrostatic
charge is transferred to the polymerization bath and accumulates if the vessel is not grounded. The
electrostatic field created by the accumulated charges can be so strong that small beads are repelled
over the bath and will no longer enter it. Therefore, the grounding hook attached to the grounding wire
is put into the polymerization bath so that the electrostatic charges will flow to ground, see figure 5-8.
2
1
a Electrode hole
 Screws of the clip to change
the length of the clip
Figure 5-5: Electrode with two clips
Figure 5-6: Grounding set