Charging Generators by Goodnewson


									                                                                                                              SPECIFICATION SHEET

Ion Industrial
Electrostatic Charging Systems
Electrostatic charging using ionization is often the most elegant and          and webs of film or paper. Typical applications include manufacturing of
efficient way of accomplishing many physical tasks in handling paper           binders, chill roll edge pinning on cast film lines, lamination, in-mold
and plastic films, webs and sheets. The users who design charging into         labeling (IML), plastic bag manufacturing, roll transfer, shrink wrapping,
their process seldom go back to mechanical means of accomplishing              and other.
the same task.
                                                                               In the press room and in the bindery, charging applications are a part of
A charging generator and charge applicator make up an electrostatic            several processes, such as ribbon tacking, chill roll tacking, inserting
charging system. A single charging system or a combination of two              cards into magazines and catalogs in saddle stitchers and perfect
charging systems are used for “pinning” or “tacking” together sheets           bound lines, and catalog stacking.

      C       H       A       R       G       I      N       G            G        E       N       E      R       A       T        O     R       S

The 7020 OEM Charging Generator is a solid-state high voltage DC
power supply for use with specified charge applicators, including Ion
model 7401 Charging Bar.                                                          Charging System with
The 7020 OEM Generator is designed as a "black box" to be fully                  the 7020 OEM Charging
integrated into a process including a customer-provided 24-volt DC                 Generator and 7401
power source. The remote high voltage output activation signaland the                 Charging Bar
output voltage and charging current analog signals are available at the
I/O connector on the generator board. The face panel of the generator
contains only an “HV On” indicator light. Output voltage or charging
current level is set using a trimming potentiometer located inside the
enclosure. An external output adjust potentiometer can be installed on
customer’s request.

                                                                                   Charging System
                                                                                    with the 7220
The 7220 Charging Generator is a full-function device with all the
indicators and controls on its front panel. The 7220 can also be fully            Generator and 7401

integrated into a process similar to the 7020, or controlled manually               Charging Bar
from the front panel of the unit.


The 7305 Charging Generator is a 30-kilovolt, 5 milliamp solid-state microprocessor-based
fully-programmable high voltage DC power supply for use with specified charge applicators.                 Charging System with
The 7305 Charging Generator is available with negative output voltage, positive output                    the 7305 Generator and
voltage or dual polarity. Using the multifunctional display and controls, the 7305 generator can            7430 Charging Bar
be programmed to provide timed charging action, output level alarms, remote output control
and any of the three operating modes.

All three generators can operate in the “Constant Voltage” mode, as well as in the “Constant Current” mode
with exceptional stability. The examples in the next page explain advantages of each operating mode.

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                                                                                                                                                                                                                                                        SPECIFICATION SHEET
Constant Current Mode (CCM) Operation                                                                                                                                             Constant Voltage Mode (CVM) Operation
In the Constant Current mode, the user sets the charging current, and                                                                                                             In the Constant Voltage mode, the user sets the voltage, and the system
the system automatically adjusts the output voltage to maintain the set                                                                                                           maintains the selected voltage value constant regardless of the
charging current value constant.                                                                                                                                                  changes in the charging current values.
The Constant Current operation is explained below in two                                                                                                                          The Constant Voltage operation is explained below on two
application examples.                                                                                                                                                             application examples.
                        1600                                                                                         1600                                                                                                                                                1600
                                                         A.                                                                                         B.                                                     1600
                                                                                                                                                                                                                                          A.                                                            B.
Charging current, uA

                                                                                                                                                                                  Charging current, uA
                        1200                                                                                         1200                                                                                  1200                                                          1200

                         800                                                                                          800                                                                                   800                                                           800

                         400                                                                                          400                                                                                   400                                                           400
                                                                           Critical electrode contamination

                               0                                                                                            0                                                                                     0                                                             0
                          20                                                                                           20                                                                                    20                                                            20

                                                                                                                                                                                  Operating voltage, kV
Operating voltage, kV

                                                                                                                       15                                                                                    15                                                            15

                                                                                                                                                                                                             10                                                            10
                          10                                                                                           10

                                                                                                                                                                                                                  5                                                             5
                               5                                                                                            5

                                                                                                                                                                                                                  0                                                             0
                               0                                                                                            0
                                                                                                                                                                                                                      24   48   72   96    120   144   168   192   216              5   10   15   20     25   30   35   40   45
                                     24   48   72   96   120   144   168                                 192   216              10   20   30   40   50    60   70   80   90
                                                                                                                                                                                                                                     Time, hours                                                  Time, seconds
                                                Time, hours                                                                               Time, seconds

                                   Figure 1 - Examples of the Constant Current Mode Operation.                                                                                                                  Figure 2 - Examples of the Constant Voltage Mode Operation.
                                   A - continuous web charging action; B - sheet charging action.                                                                                                         A - continuous web charging action; B - label-on-carrier charging action.

The graph in Figure 1(A) shows the operating voltage and charging                                                                                                                 The example shown in Figure 2(A) is identical to the first described
current during continuous operation over a period of time, such as may                                                                                                            application, except that the Constant Voltage mode was selected.
exist in pinning a running web to a metal roller with a charge applicator.                                                                                                        According to the graph, the output voltage was set to 12 kV to achieve
According to the graph, the charging current was set at 1000                                                                                                                      the charging current of 1 mA. As the ionizing electrodes accumulated
microamperes (µA), or 1 milliampere (mA). The output voltage required                                                                                                             contamination, the charging current began to fall, as shown in the upper
to achieve that current was about 12 kV. As industrial contamination                                                                                                              chart. However, the output voltage remained at the preset level. In the
started accumulating over time on the ionizing electrodes of the charge                                                                                                           Constant Voltage mode, the operator would need to manually keep
applicator their capacity to generate current diminished requiring higher                                                                                                         increasing the output voltage to maintain consistent pinning.
operating voltage to generate the 1 mA current. The lower graph shows                                                                                                             The Figure 2(B) illustrates a process of pre-charging labels on a special
that the system kept automatically increasing the operating voltage to                                                                                                            carrier plate attached to an end-of-arm tool for electrostatic in-mold
maintain process consistency without operator’s involvement. When                                                                                                                 label application (IML). Each label is exposed to the charge applicator
the operating voltage reached the maximum output, the charging                                                                                                                    for 5 seconds. Then, it takes 15 seconds for the label carrier to apply the
current started to drop indicating the need for cleaning the ionizing                                                                                                             label to the mold, return to the magazine and pick up the next label, and
electrodes.                                                                                                                                                                       bring it in front of the charge applicator. According to the graph, the
The graph in Figure 1(B) shows the operating voltage and charging                                                                                                                 output voltage was set at 14kV to achieve the necessary electrostatic
current during the process of charging plastic sheets. It takes 10                                                                                                                holding force. The charging current was 0.5 mA with the label carrier in
seconds for a sheet to pass under the charge applicator, and it takes 10                                                                                                          front of the charge applicator. The moment a label carrier moves away,
more seconds for the next sheet to arrive. According to the graph, the                                                                                                            the current immediately goes down to 0.05 mA, thus preserving the
charging current was set at 1 mA with the sheet under the charge                                                                                                                  ionizing electrodes and the generator from unnecessary wear.
applicator. The output voltage required to achieve that current was                                                                                                               The Constant Current mode is appropriate only for applications where a
again 12 kV. The moment a sheet would leave the charging area, the                                                                                                                counter-electrode is continuously present during the operation. The
charge applicator would “see” the bare surface of the grounded metal                                                                                                              Constant Voltage mode can be used in practically all applications, but it
roller. If the voltage remained at 12kV, the current would immediately go                                                                                                         is especially useful in applications where a counter-electrode is not
up. In the Constant Current Mode, the generator adjusts the operating                                                                                                             present during portions of the charging cycle while the high voltage is
voltage down to 5 kV to maintain the current level. When a new sheet                                                                                                              applied to the charge applicator, or when the distance to the counter-
would arrive, the operating voltage goes back up to 12kV to maintain the                                                                                                          electrode varies greatly.
necessary current. The Constant Current mode preserves the charge
applicator and the generator from unnecessary wear.
                                                                                                                                                                                  MKS, Ion Industrial                                                  MKS, Ion Industrial Europe                      MKS, Ion Systems
                                                                                                                                                                                  1000 Old County Circle, #116                                         Marie-Curie-Strasse 8                           Alameda, California
                                                                                                                                                                                  Windsor Locks, CT 06096                                              D-79539 Loerrach, Germany                       USA
                                                                                                                                                                                  Phone: 860-292-6847                                                  Tel. ++ 49 (0) 7621 - 5500 355
                                                                                                                                                                                  Fax: 860-292-6807                                                    Fax ++ 49 (0) 7621 - 5500 360

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