causes and solutions

Electrostatic discharge is a natural phenomenon that happen in dielectric materials , when subjected to friction with other one, compression , streching. It is a high voltage voltaic bow, between a dielectric surface anso ne metallic point. Normally it is measured with a specific instrument in KV (kilovolt) to distance of one inch.

How static electricity is generated

Static electricity is generated inside dielectric materials , dual larges industrial production processes. Physical explanation is that inside atomic structure of material , atom is formed by a nucleos and around it turns electrons. Under this condition , nucleus is positive and electrons are negative, it is named charge zero. It means that positive charge=negative charge. Following a change of material’s status (for example streching or friction on another material), there is electrons migration from a material to another. Cause of it, one material result more negative if receive electrons and other one will be positive, because it supplied electrons. This phenomenon generate a voltaic bolt in different intensity , up 20-50 KV, about mechanical cause that generated it.

Troubles and consequences for electrostatic

There are a lot of consequence that static electricity produce for working process materials. Starting with an annoyance for operator that are working until quality problems in final product.

    What most frequently happen, is:
  • Electric discharge that, if in high intensity, could be dangerous for operator security
  • High voltage discharges along metallic machine case could serious damage PLC, electronic and panel control
  • In case of using solving machines (example Rotogravure…) or in ATEX zone, high voltage discharge are origin of fire ignition

On opposity, static electricity could be a valid support if managed and controlled. The Electrostatic Charger is a static generator, one or double polarity, that works with bars or noozles. The Charger can be helpful in case you have to improve adhesion between two dielectric sheets together, example for packaging, or anyway when working process needs to maintain two materials in touch for a few seconds without mechanical engineering.

Solutions

RPO range products, is able to solve greatest cases of static problems using Passive and Actives solutions, different in operation principle but both guarantee efficienty and goal achievement.

Soluzioni passive

Sfruttano il principio dell’attrazione, la carica elettrostatica presente sul materiale dielettrico viene “attratta” da un profilo fortemente conduttivo e scaricata a massa. Sono conosciuti come Spazzole Antistatiche in Carbonio, a tutti gli effetti delle barre antistatiche non alimentate che si rivelano particolarmente efficaci soprattutto nei casi di forte carica statica. Vengono posizionate NON a contatto col materiale carico, in genere ad una distanza compresa tra i 5 e 10 mm e collegate alla terra elettrica tramite la struttura stessa del macchinario.

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Soluzioni attive

Contrariamente alla precedente, la carica elettrostatica non viene eliminata per conduzione ma per compensazione. Ricordando che la carica elettrostatica ha origine da una situazione di disequilibrio tra due materiali (v. sopra), in cui uno presenta una polarità prevalente sull’altra, si forniscono ioni di segno opposto in modo da azzerare quelli in eccesso. Per ottenere questo è necessario un alimentatore in alta tensione che produce ioni sia positivi che negativi, al quale si possono collegare unità ionizzanti di diverse forme e caratteristiche, come barre, ventilatori o ugelli a soffio ionizzanti a seconda dell’impiego.

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