PhD. Eng. Mihaela PARAIAN, PhD. Eng. Emilian GHICIOI, PhD. Eng. Sorin BURIAN, PhD. Eng. Florin PAUN, PhD. Eng. Adrian JURCA, PhD. Eng.Leonard LUPU, PhD. Eng. Niculina VATAVU
Rezumat
Prevenirea formarii sarcinilor electrostatice direct la om sau pe elemente învecinate presupune un ansamblu de
masuri si mijloace pentru asigurarea unor cai corespunzatoare de scurgere (disipare) a sarcinilor la pamânt. Acest lucru se
poate realiza prin folosirea îmbracamintei disipative, a încaltamintei cu conductibilitate electrica corespunzatoare si a
pardoselei adecvate sau prin alte mijloace de descarcare la pamânt.
Unul dintre materialele textile utilizate pe scara larga pentru confectionarea articolelor de îmbracaminte este bumbacul
100%.materialele textile confectionate din bumbac 100% corespund din punct de vedere electrostatic respectiv al
rezistivitatii de suprafata doar în conditiile unor umiditati relative mai mari de 65%. Acest aspect implica un domeniu de
utilizare limitat al articolelor de îmbracaminte confectionate din bumbac 100%, determinat de conditiile de umiditate
relativa existente la locurile de munca. De aceea au fost dezvoltate noi tipuri de materiale disipative din punct de vedere
electrostatic si noi metode de încercare a lor pentru evaluarea conformitatii cu cerintele specifice domeniului ex care sunt
date in noile standarde elaborate la nivel european si preluate ca sr. Noile metode de evaluare / încercare a proprietatilor
electrostatice ale îmbracamintei au la baza criteriul timpului de înjumatatire a sarcinii sau al factorului de ecranare.
In cadrul laboratorului lenexemeip este in curs de implementare o noua metoda de incercare pentru determinarea
performantelor de protectie esd ale materialelor textile folosite la confectionarea îmbracamintei de protectie utilizata în
medii cu atmosfera exploziva scopul evaluarii conformitatii cu cerintele esentiale de securitate ale directivei ppe prin
masurarea capacitatii de disipare a sarcinii - metoda de încercare cu încarcarea prin inductie.
Cuvinte cheie: atmosfere exploziveEIPelectricitate staticaîncercari de laboratorevaluare conformitate
Abstract
Prevention of electrostatic charges formation on persons or their neighboring elements suppose an assembly
of measures and means to ensuring proper paths of dispersion (dissipation) of charges to earth. This can be achieved by
using dissipative garments, footwear with adequate electric conductivity and adequate flooring, or by other means of
dissipation to earth.
One of the textiles widely used for manufacturing clothing elements is 100% cotton. The textile materials made of 100%
cotton are adequate from an electrostatic point of view, respectively from the surface resistivity point of view only on
condition of a relative humidity higher than 65%. This aspect involves a limited use for the garment elements
manufactured with 100% cotton, decided by the relative humidity conditions existing at the respective workplaces. This is
the reason why new types of electrostatic dissipative materials had been developed as well as new test methods for these,
in order to assess conformity with the specific Ex field requirements, given in the new European standards, and harmonized
as Romanian national standards. The new test/assessment methods for the electrostatic properties of garments are based
on the half discharge time or the screening factor.
Within the LENExEMEIP laboratory a new test method is in its course of implementing for determining of the ESD protective
performances of textile materials employed in manufacturing of personal protective clothing used in environments with
explosive atmospheres for the purpose of assessment of conformity with the essential safety and health requirements in
the PPE European Directive, by measurement of charge dissipation capacity - the test method with induction charging
Keywords: explosive atmospheresPPEstatic electricitylaboratory testsconformity assessment
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