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Sensors & Controls | Spray Controls | Compound Lining Gun Control
With Sencon's high speed, high precision solenoid drivers, considerable improvement can be gained in the consistency and precision of electro-pneumatic guns on static compound lining machines
Compound lining on formed ends needs to be precisely timed with sharp, clean triggering and cut-off, otherwise it can leave residual compound extrusions or “tailing”. This is not only wasteful of expensive sealant, it can also cause contamination problems and machine downtime further down the line.
Mechanical guns are particularly vulnerable to this sort of problem because they are difficult to control with precision. Electropneumatic guns with an accompanying solid state solenoid driver give better control over sealant placement and improved end product quality.
Sencon’s CGC22 spray timer is ideally suited to maximize the efficiency of electro-pneumatic guns on stationary end liners. Originally developed to overcome solenoid latency on internal spray applications for beverage cans, the CGC22 uses a carefully calibrated application of power to the solenoid to deliver tight and consistent opening and closing of the gun nozzle.
Solenoids are inherently slow in turning on and off. In the ‘pick-up’ phase, the solenoid driver provides a high voltage to maximize the current and therefore, force in the coil. Since the time duration is short, no damage to the coil occurs.
Once the solenoid is activated, the coil’s stored energy must be dissipated to facilitate the solenoid turning off. In the ‘hold’ phase, the solenoid driver acts as a ‘reducing’ power supply allowing excess voltage to dissipate from the solenoid coil. By minimizing this voltage, the time required to remove the remaining energy to turn the solenoid off is greatly reduced. In addition, heat build-up in the solenoid is also reduced.
By eliminating the conventional flywheel diode and allowing reverse voltage on switch-off, stored energy is rapidly dissipated. This creates a fast — and more importantly — highly repeatable turn-off time for the solenoid.
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With service engineers based in North and South America, Europe and Asia, backed up by support from our experienced industry specialists at three technical support centers, you can trust Sencon for support, accredited calibration and after-sales service for your Compound Lining Gun Control.
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