Explosion hazard due to electrostatic charge in gravure printing plants
In many industries, the use of flammable liquids produces gases which, in combination with atmospheric oxygen, create an explosive atmosphere. An explosion of this ignitable mixture can only occur if an ignition source is also present. An ignition source that arises through contact and separation of the flammable liquid, i.e. through pumping over, stirring, mixing, sampling as well as cleaning work, are the feared electrostatic charges. If a gas discharge occurs due to high electrostatic charge with sufficiently high energy, an explosion will occur which may result in significant personal injury and property damage. Equipment in gravure printing In gravure printing plants, in the area of flexible packaging, cigarette printing or illustration printing, solvent-based inks are almost exclusively used for printing. On its way from the truck to the press, the solvent-based ink passes through several areas of the company. Wherever the solvent-based ink is pumped, mixed or metered, dangerous electrostatic charges can occur which, in the event of a gas discharge, can lead to high property damage and/or personal injury. To prevent this, the active ground monitoring systems must be used at the neuralgic points instead of the simple passive ground clamps. The risk of a missing or insufficient ground connection is thus significantly reduced. The handling of solvent-based ink or solvents is very similar in different plants. In the areas described below, it is necessary to use an active ground monitoring system.
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