Shidike ST-E high-frequency pulsed DC ionizing bar for wide-span static control

ST-E Intelligent Ionizing Bar

The wide-span bar. High-frequency pulsed DC with fixed-polarity emitter pins arranged alternately along the bar — each pin holds one polarity instead of alternating, which is why this is the bar positioned for a wide or long span where a single-emitter design drifts. Ion balance ±80 V, 6.5 kV DC pulse from DC 24 V, 12 W.

Ion balance: ±80 V — holds across a wide or long span
Ion output: +150 % over a conventional design — rated for the intelligent bar series, not the ST-E alone
Working distance: 30–1000 mm
Output: 6.5 kV DC pulse · high-frequency pulsed DC · DC 24 V, 12 W
Length: Made to order, 300 mm to 3 m

Built for width. Fixed-polarity emitter pins arranged alternately keep output even from one end of a long bar to the other.

What the ST-E Fixes

If any of these is happening on your line, the cause is usually a surface charge nobody is measuring.

One end of the web is clean, the other is not

On a long bar a single-emitter design drifts — one end neutralizing harder than the other. The wider the web, the more it shows in the defect map.

Fixed-polarity pins arranged along the bar

Neutralization thins out across the width

Ion output that is adequate at the centre can be too weak by the time it reaches the edges of a wide web.

Alternating fixed-polarity pins

EOS/ESD damage on optical and semiconductor parts

Device types with the lowest EOS/ESD sensitivity thresholds fail from charge levels that would not affect ordinary components.

High-frequency pulsed method, ±80 V balance

How It Works

High-frequency pulsed DC: many emitter pins run along the bar, each holding a fixed polarity, positive and negative pins arranged alternately.

High-frequency pulsed DC waveform of the ST-E ionizing bar: a balanced train of positive and negative high-voltage pulses, with pulse period T, positive pulse width Ton and negative pulse width Toff marked — Polarity switches fast enough that the average DC sits near zero, so no net charge builds on the material — that is what separates this from a plain DC bar, which leaves the surface biased toward one polarity.

Because each pin does one job rather than alternating, output stays even from one end of the bar to the other. That is the whole point of the design, and it is what a single-emitter bar cannot do at length.

Shidike rates the intelligent bar series at 150 % more ion generation than a conventional design. That figure is quoted for the series rather than for the ST-E specifically, and it is published without a comparison model or test conditions — so read it as a rating, not as a measure of edge-to-edge uniformity on your own web. The even output along the bar comes from the pin arrangement described above.

Ion balance is ±80 V — looser than the ST-G. That figure is the offset of the bar itself, not the residual left on your material, which is measured separately against your own process limit. High voltage is generated inside the bar from DC 24 V at 12 W.

Supersonic air-intake structure, which is what the bar's neutralizing speed is attributed to
Up to 100 Hz pulse rate for high-speed moving targets
High-frequency pulsed DC suits optical and semiconductor device types with the lowest EOS/ESD sensitivity
Detects abnormal discharge, raises an alarm and cuts the high voltage automatically
Broadband network port for line-level monitoring and industrial networking
High voltage generated inside the bar — no external power supply box, no fixed HV cable

Specifications & Dimensions

Model	ST-E series intelligent ionizing bar
Input voltage	DC 24 V
Power	12 W
Ion generation	Corona discharge
Output	6.5 kV DC pulse (high-frequency pulsed DC)
Ion balance	±80 V
Static decay time	1 s, rated — initial surface voltage, working distance and measurement method not published
Working distance	30–1000 mm
Operating temperature	0–45 °C, no condensation
Operating humidity	15–75 % RH, no condensation
Cross-section	30 × 82 mm
Length	Made to order from 300 mm, up to 3 m
Protection	Abnormal-discharge alarm with automatic high-voltage cutoff
Connectivity	Broadband network port

ST-E ionizing bar installation dimensions: 82 by 30 mm cross-section, overall view with mounting hole pitch, and mounting bracket detail with an 8 by 20 mm adjustment slot — The ST-E shares the bar profile and mounting hardware with the rest of the series: a 30 × 82 mm section, two brackets, and an 8 × 20 mm slot so the bar can be shifted after the holes are drilled.

Mounting hole pitch by bar length

Every bar takes two mounting holes, and the pitch is always the bar length less 120 mm — so you can work out the drilling for any made-to-order length.

Bar length (L)	Mounting hole pitch (P)	Holes
300 mm	180 mm	2
600 mm	480 mm	2
900 mm	780 mm	2
1200 mm	1080 mm	2
1500 mm	1380 mm	2
1800 mm	1680 mm	2
2100 mm	1980 mm	2
2400 mm	2280 mm	2
2700 mm	2580 mm	2

Built in our own Dongguan factory since 2013 About Shidike →

Not sure the ST-E is the right bar? Send the material, line speed, working distance and measured surface voltage — we will come back with a model, a length and a mounting position.

Where It Goes

The bar mounts across the material, facing it, anywhere from 30 mm to 1 m away. The ST-E is the one to choose where that span is wide.

Four typical mounting positions for an ionizing bar on a web line: at the unwind, ahead of the cleaning station, overhead on a gantry, and at the stacker — Four positions, one line. Which one you need depends on where the charge is created rather than where the defect shows up.

Wide web and roll-to-roll lines

On a wide web the failure mode is not "no neutralization" but uneven neutralization — one edge clean, the other still pulling dust. The ST-E is designed for exactly that span problem.

Long bars over multi-lane conveyors

Where one bar spans several lanes, output has to be the same over every lane. Fixed-polarity pins arranged along the bar are what deliver that.

Optical and semiconductor handling

±80 V is the bar's own offset; what these processes have to hold is the residual on the part, measured separately. The high-frequency pulsed method suits device types with low EOS/ESD sensitivity.

Electronics Printing Optoelectronics Textile SMT & PCB Film & Converting

Which Model, and What Length

All three bar series are rated 6.5 kV pulse output, generated inside the bar from a DC 24 V supply at 12 W, over a 30–1000 mm working range, and all three are made to length. What differs is how that high voltage is applied — pulsed AC on the ST-G, pulsed DC on the ST-E and the ST-F — and that decides which one fits your line.

ST-G — pulsed AC	Ion balance ±50 V, the tightest of the three. Adjustable frequency to 100 Hz. The default choice unless something below applies.
ST-E — high-frequency pulsed DC	Ion balance ±80 V. Fixed-polarity pins arranged alternately — each pin holds one polarity — which is why this is the bar positioned for a wide or long span, where a single-emitter design drifts.
ST-F — pulsed DC, Hibweer L.C.C.	Ion balance ±100 V, with neutralizing speed rated 2.5× a conventional bar; the ST-G and ST-E carry a 2× rating. Neither figure is published with a comparison model or test conditions, so the two ratings cannot be read as measured against one reference. Choose it when the material moves too fast for a standard bar to keep up.

Made to your width

Bars are not sold in fixed sizes. We cut the bar to the width of your material, anywhere from 300 mm to 3 m, so you are not paying for length you do not use or leaving an edge uncovered.

Frequently Asked Questions

What ion balance does the ST-E achieve?

±80 V. That is looser than the ST-G at ±50 V and tighter than the ST-F at ±100 V. All three figures describe the offset of the bar itself, not the residual surface voltage left on your material — that is a separate measurement against your own process limit. The ST-E trades a little balance for the pin arrangement that holds output even across a wide span.

Why choose the ST-E over the ST-G?

Span. The ST-G has tighter balance and is the better default, but on a wide or long bar a single-emitter design drifts from one end to the other. The ST-E uses many fixed-polarity pins arranged alternately, so each pin holds one polarity rather than a single emitter alternating along the whole length. That is the design reason to pick it for width; the 150 % ion-generation rating applies to the intelligent bar series generally, not to the ST-E alone.

What is the ST-E's working distance?

30 mm to 1000 mm, the same as the ST-G and ST-F. The bar series share the working range; they differ in how the ions are generated.

Does the ST-E need a separate high-voltage power supply?

No. High voltage is generated inside the bar from a DC 24 V supply at 12 W. There is no external power supply box and no fixed-length high-voltage cable restricting where the bar can be mounted.

How long can an ST-E bar be?

Made to order from 300 mm up to 3 m, cut to the width of your material. The cross-section is 30 × 82 mm. Long bars are the case the ST-E is designed for.

What happens if the bar fails?

It detects abnormal discharge, raises an alarm and cuts the high voltage automatically. A broadband network port lets that alarm be read at line level rather than at the bar.

Is high-frequency pulsed DC better than pulsed AC?

Neither is better in general — they solve different problems. Pulsed AC (ST-G) gives the tightest balance from a single pin. High-frequency pulsed DC (ST-E) gives higher output spread along the bar, which is what wide spans need.

Request a quote for the ST-E Give us the material, line speed, working distance and measured surface voltage, and the length you need.

New to ionization? What is an ionizing bar covers how corona discharge neutralizes a charged surface, and ionizing bar voltage output explains the 6.5 kV figure. To compare the range, see all industrial static eliminators and ionizing bars.