Plate cutting machine, electrostatic adsorption principle

Static electricity is an electric charge that repels the same sex and attracts the opposite sex.

Principle of electrostatic adsorption phenomenon:

When an object with static electricity is close to another object without static electricity, due to electrostatic induction, the inside of the object without static electricity is close to the side of the electrostatic object that is opposite to the charge carried by the charged object (the other side produces the same number of copolar charges), and the phenomenon of "electrostatic adsorption" is exhibited due to the attraction of opposite charges to each other.

For example, if a negatively charged glass rod is placed near a small piece of paper that is not charged, the side of the piece of paper near the glass rod will induce a positive charge (the other side will induce a negative charge); The negative charge of the glass rod and the positive charge in the small piece of paper then attract each other, resulting in the phenomenon of "electrostatic adsorption".

Electrostatic adsorption film is a kind of non-adhesive film, and the performance test can evaluate flexible packaging; The design voltage of the testing instrument is 1000V; Mainly PE, PVC material, relying on the product itself electrostatic adsorption to adhere to the article to play a protective role, generally used for adhesive or glue residue sensitive surface, mostly used in glass, lenses, high-gloss plastic surface, acrylic and other very smooth surface.

Electrostatic adsorption is a phenomenon in which a tiny non-static-charged object is attracted to the electrostatically charged object due to the phenomenon of electrostatic induction, when it is close to the electrostatic object, the end close to the electrostatic object induces the opposite electrical properties to the electrostatic object.

Principle of electrostatic adsorption phenomenon:

When an object with static electricity is close to another object without static electricity, due to electrostatic induction, the side of the object without static electricity near the electrostatic object will accumulate charges of opposite polarity to the charge carried by the charged object (the same number of copolar charges are generated on the other side), and the phenomenon of "electrostatic adsorption" will be exhibited due to the attraction of opposite charges to each other.

No static electricity is felt on the outside of the electrostatic film, it is a self-adhesive film, and the adhesion is low, so it is enough to use it on the high-gloss surface. It is mainly blown by adding other additives during processing and blowing the film by means of three-layer co-extrusion. There is no need for the coating process, and there is no trouble of glue dropping.

The principle of static electricity:

Any matter is made up of atoms, and the basic structure of atoms is protons, neutrons, and electrons. Scientists define protons as positively charged, neutrons are uncharged, and electrons are negatively charged. Under normal conditions, the number of protons and electrons of an atom is the same, and the positive and negative charges are balanced, so it exhibits an uncharged phenomenon externally.

However, due to external actions such as friction or acting in the form of various energies such as kinetic energy, potential energy, thermal energy, chemical energy, etc., the positive and negative electricity of the atoms will be unbalanced. In everyday life, friction is essentially a process of constant contact and separation. In some cases, static electricity can be generated without friction, such as induction electrostatic activation, thermoelectric and piezoelectric electrification, Helmholtz layer, jet electrification, etc.

Any two objects of different materials come into contact and then separate, static electricity can be generated, and the common method of generating static electricity is triboelectric electricity. The better the insulation of the material, the more likely it is to generate static electricity. Because air is also made up of atoms, it can be said that static electricity can be generated at any time and anywhere in people's lives.

It is almost impossible to completely eliminate static electricity, but there are measures that can be taken to control static electricity so that it does not cause harm.

It is formed by the redistribution of charges caused by friction, and there are also forms of redistribution of charges caused by the mutual attraction of charges, specifically because matter is composed of atoms, and there are negatively charged electrons and positively charged nuclei in the atoms. In general, the positive charge of the nucleus is equal to the negative charge of the electron, and the positive and negative are balanced, so it is not electrically visible. However, if the electrons are deorbited by an external force, resulting in an unbalanced electron distribution, for example, triboelectric is essentially a process that causes an imbalance of positive and negative charges.

When two different objects touch each other and rub against each other, the electrons of one object are transferred to the other and become positively charged because of the lack of electrons, while the other body gets some remaining electrons and the object is negatively charged, and the object is electrostatic.

Utilization of static electricity:

1. Electrostatic precipitator: it can eliminate coal dust in flue gas.

2. Electrostatic copying: books, materials and documents can be copied quickly and conveniently.

3. High-voltage static electricity can also promote the production of liquor, the aging of sour vinegar and soy sauce. The taste of aged liquor, sour vinegar and soy sauce will be purer. Some liquors, sour vinegar and soy sauce use high-voltage static electricity.

Any matter is made up of atoms, and the basic structure of atoms is protons (positively charged), neutrons (uncharged), electrons (negatively charged), as shown in the figure, protons and neutrons are not easy to separate due to their high mass, strong binding force, and are tightly packed together called nuclei, and the electrons are not of high mass and surround the nucleus. In the normal state, the number of protons and the number of electrons of an atom is equal, the positive and negative charges are balanced, and the external appearance is electrically neutral (uncharged), when subjected to some external force (such as friction, photoelectric action, etc.), the electrons around the nucleus are out of orbit, destroying the uncharged state of the atom, and the electrons leave the original atom and invade other atoms, causing the original atom to be positively charged, and other atoms to be negatively charged. This phenomenon is caused by the deorbiting of electrons due to an external force, which is often accompanied by our daily work.

Like contact, separation, friction, induction, flow of air ......and so on will generate static electricity. The strength of static electricity is closely related to the material of the object, the friction and the relative speed, pressure, temperature and humidity of the environment.

The principle of electrostatic adsorption phenomenon: When an object with static electricity is close to another object without static electricity, due to electrostatic induction, the internal close to the side of the electrostatic object will produce an electric charge carried by the charged object.

The particles are charged, and the opposite charges in the static electricity attract each other.

The working principle of the electrostatic precipitator is to use the inhomogeneous electric field of high-voltage DC to ionize the gas molecules in the flue gas, produce a large number of electrons and ions, move to the poles under the action of the electric field force, and touch the dust particles in the air flow to make them charged during the movement, and the charged dust moves to the polar opposite polarity of the electrode dust under the action of the electric field force, and the charged dust is adsorbed on the plate or pole line by the electrostatic force when it reaches the plate or pole line, and the dust falls into the ash hopper through the rapping device to purify the flue gas.

Due to radiation friction and other reasons, the air contains a small amount of free ions, and it is impossible to fully charge the dust particles in the dusty air by these free ions alone. Therefore, in order to use static electricity to separate dust, two basic conditions must be met: first, there is an electric field that charges the dust; The second is the presence of an electric field that separates the charged dust particles. The general electrostatic precipitator adopts the method of charging the electric field and separating the electric field.

The discharge electrode is connected to the negative electrode of the high-voltage DC power supply, and the dust collection electrode is grounded as the positive electrode.

Let's take a look at the key sentence: first make the insulating plate positively charged (or negatively charged) by friction. Because the charged flat plate insulation cannot produce the transfer of charge when it comes into contact with other conductors, it can only be induced by electrostatic force.

Pay attention to three common ways of charging: triboelectric activation, contact electrification requires contact, but triboelectric is generally between insulators, contact energized is between conductors, and inductive electrification can not be contacted).

It should be because insulating boards and wooden boards do not conduct electricity.