of vaporized fluid is dedicated to the task of sweeping away dust and debris and need not be very substantial as it is desirable not to change the aerodynamics of the flow of gases between the shields that accompany the web w typically the flow of vaporized solvent around each needle is 0 75 scfm for a 10 needle array this can be compared to a flow of about 260 scfm between the shields from all sources also since the flow of vaporized solvent through the holes 143 is intended to be continuous it is expected to be suitable to deflect and disperse dust or debris before it can contact the needles 142 or become firmly attached thereto preferably the dust and debris is deflected into the more substantial vapor flow accompanying the web w to be carried along therewith and carried away on the forming sheet on the conveyor belt as such the dust and debris would then be away from the electrostatic charging system and may be captured by suitable filters or other atmospheric control equipment in the spin cell e g netting arrayed in the upper portion of the spin cell in a second preferred embodiment which is not shown a second arc of needles is provided which is.