Static electricity is a common phenomenon of charging. […]
Static electricity is a common phenomenon of charging. For example, when you comb your hair with a plastic comb in dry weather, you can hear the sound of "cracking" discharge. There are many examples of the use of static electricity, such as electrospray paint, electrostatic dust removal, electrostatic flocking, electrostatic copying, etc., but these are all using high-voltage electrostatic fields generated by external energy to work, and generated during the production process described below The harmful static electricity is not exactly the same, the following focuses on the generation of static electricity, the harm of static electricity, and the measures to eliminate the harm of static electricity.
First, the static electricity generating substance is composed of molecules. The molecules are composed of atoms. The atoms are composed of the nucleus and its surrounding electrons. When the two substances are in close contact and then separated, one substance passes electrons to the other substance and is positively charged, and the other substance receives electrons and is negatively charged, thus generating static electricity. Common static phenomena in production include: frictional charging, flow charging, ejection charging, impact charging, rupture charging, droplet charging, and so on.
Second,The hazards of static electricity There are three main types of hazards of static electricity:
1. Fire or explosion Fire and explosion are the greatest hazards of static electricity. Although the static electricity is not large, it is easy to discharge due to its high voltage and generate static sparks. In working places with flammable liquids, such as oil shipments, static sparks may cause fires; in places with explosive dust or explosive gases and vapors, such as coal powder, flour, aluminum powder, hydrogen, etc., may be caused by electrostatic sparks. Caused an explosion.
2. Electric shock The electric shock caused by static electricity may occur when the human body is close to a charged substance, or it may occur when a human body with a static charge approaches a grounded body. At this moment, the static electricity of the human body may reach tens of thousands of volts. The severity of electrostatic shock is related to the energy stored in the body with static electricity. The greater the energy, the more severe the electric shock. The greater the capacitance or voltage of the charged body, the more severe the electric shock. The electrostatic energy generated during the production process is very small, so the electric shock caused by it will not directly kill people. However, the human body may fall or fall due to electric shock, causing a second accident. In addition, the electric shock can cause staff to be nervous and affect their work.
3． Obstruction to production Static electricity can hinder production or reduce product quality. In the textile industry, static electricity causes the fibers to entangle and absorb dust, which reduces the quality of the textile. In the printing industry, static electricity causes the paper line to be uneven and cannot be separated, which affects the printing speed and printing quality. In the photosensitive film industry, static sparks make the film photosensitive, reducing Film quality; In the powder processing industry, static electricity causes the powder to be adsorbed on the equipment, which affects the filtering and transportation of the powder; static electricity may also cause malfunction of electronic components; interference with radio communications, etc.