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Static Shielding Bags Reclosable

Static shielding bags reclosable used in laboratory

What are static shielding bags reclosable?

Static shielding bags reclosable are commonly used for packaging of electronic components to prevent damage caused by electrostatic power generation that can easily occur in electronic components. Usually, the anti-static shielding bags use a two-layer composite or higher four-layer structure. The bag forms a Faraday cage induction shield effect to maximize the protection of the bag contents and electrostatic field isolation, to prevent the accumulation of static electricity from electrostatic hazards.

The shielding bag has excellent anti-static, anti-R, F, anti-water vapor penetration, anti-salt spray, and many other functions. Their unique four-layer structure creates an inductive shield effect to protect the bag from static electricity. The other inner layer is made of antistatic vinyl, which provides excellent antistatic function. The inner and outer layers of the anti-static screen bag material are made of transparent anti-static material with a semi-transparent conductive metal layer in between, thus providing good anti-static, anti-static, and anti-static screening properties.

Working principle of static shielding bags reclosable

Static shielding bags provide an isoelectric potential for electrostatic sensitive components contained in antistatic bags. When the sensitive element is placed in the bag, frictisensor the electrostatic voltage between the sensitive device and the local part of the bag, while the local static electricity is quickly dissipated to the surface of the bag and reduces the voltage, leaving the device and the rest of the bag at the same level. Two objects at the same potential will not generate electrostatic discharge. This balances the voltage inside the bag, thus acting as an anti-static, to protect the safety of electronic products.

What is static shielding?

Static shielding is to guide the body shell to its internal "protection" role so that its internal from the influence of the external electric field. In the cross-linked polymer materials or proteins and other macromolecular gels, the material is placed in a high salt concentration solution, and the phenomenon of material swelling is reduced is also known as the electrostatic shielding effect.

A. Working principle of static shielding

If a conductor is placed in an external electric field with electric field strength E, the free electrons in the conductor will move against the direction of the electric field under the action of the electric field force. Thus, the negative charge of the conductor is distributed on one side and the positive charge is distributed on the other side, which is the phenomenon of electrostatic induction. Due to the redistribution of charges in the conductor, these charges form another electric field in the direction opposite to the external electric field, and the electric field strength is within E. According to the principle of field superposition, the electric field strength inside the conductor is equal to the superposition of E outside and E inside, and the electric field of equal and opposite superposition cancel each other, making the total electric field strength inside the conductor is zero. When the total electric field strength inside the conductor is zero, the free electrons inside the conductor no longer move in the direction. In physics, the state of no charge movement in the conductor is called electrostatic equilibrium. In the electrostatic equilibrium state of the conductor, the internal electric field strength is zero everywhere. It follows that in a conductor in electrostatic equilibrium, the charge is distributed only on the outer surface of the conductor. If this conductor is hollow, when it reaches electrostatic equilibrium, there will also be no electric field inside. In this way, the shell of the conductor will play a "protective" role for its internal, so that its internal from the influence of the external electric field, this phenomenon is called electrostatic shielding.

Faraday once risked being electrocuted to do a world-famous experiment - the Faraday cage experiment. Faraday locked himself in a metal cage, when a powerful electrostatic discharge occurred outside the cage, nothing happened.

a. Electrostatic shielding

To avoid the influence of the external electric field on the instrumentation, or to avoid the electric field of the electrical equipment to the outside world, a cavity conductor covers the external electric field, so that its internal is not affected, but also does not make the electrical equipment to the outside world, which is called electrostatic shielding. The shielding of the cavity conductor is not grounded for the external shielding, the shielding of the cavity conductor is grounded for the internal shielding. In the electrostatic equilibrium state, whether it is a hollow conductor or solid conductor; regardless of how much the conductor itself is charged, or whether the conductor is in the external electric field, must be an equipotential body, its internal field strength is zero, which is the theoretical basis of electrostatic shielding.

b. Indirect verification of Coulomb's law

Gauss's theorem can be deduced from Coulomb's law. If the inverse square exponent in Coulomb's law is not equal to 2, Gauss's theorem cannot be obtained. Conversely, if Gauss's theorem is proved, it proves the correctness of Coulomb's law. According to Gauss's theorem, the field strength inside the insulated metal sphere shell should be zero, which is also the conclusion of electrostatic shielding. If the instrument is used to test whether the shielding shell is charged, the correctness of Gauss' theorem can be determined by analyzing the measurement results, which also verifies the correctness of Coulomb's law.

c. Charge shielding

In cross-linked polymers, the side groups of polymer chains are fixed inside the molecule due to cross-linking, and the counter ions corresponding to the side groups decrease in concentration with the diffusion of solvent molecules, thus causing an increase in charge density inside the gel and an increase in gel volume due to electrostatic repulsion of gel molecules, which is macroscopically manifested as gel swelling.

In the case of high salt concentration, the concentration of counter ions (e.g. Na) in the solution is large. When the solution with high salt concentration dissolves the cross-linked polymer, the counter ions diffuse into the gel molecules due to the diffusion of solvent molecules, and these counter ions combine with the side groups on the polymer molecules to shield the charge repulsion inside the molecules, resulting in a decrease in the swelling of the polymer molecules. This phenomenon is called charge shielding.
It should be noted that if the external electric field is an alternating electric field, the condition of electrostatic shielding is no longer valid.

B. Application of static shielding

Static shielding can not only make the metal conductor shell inside the instrument or work environment from the external electric field but also cannot have an impact on the external electric field.

To eliminate interference, some electronic devices or measurement equipment implement electrostatic shielding. For example,

a. Indoor high-voltage equipment covered grounded metal cover or denser metal mesh cover, electronic tubes with a metal shell.

b. As a full-wave rectifier or bridge rectifier power transformer between the primary winding and secondary winding wrapped with a metal sheet or winding a layer of enameled wire and make it grounded to achieve the shielding effect.

c. In high-vwearingga e electrically charged operations, workers wear metal wire or conductive fibers are woven into the uniform pressure suit, the human body can play a shielding role in protection.

d. In the electrostatic experiments, because of the existence of about 100V/m vertical electric field near the earth. To exclude the role of this electric field on the electrons, the study of electrons only under the action of gravity, there must be eE < 10-10V / m, which is almost no electrostatic field "electrostatic vacuum", which can only be achieved by pumTheuum cavity electrostatic shielding. In fact, the electrostatic shielding achieved by a closed conductor cavity is very effective.

Use of static shielding bags reclosable


Static shielding bags

a. The anti-static shielding bag should preferably be large enough to seal the entire product

The static bags should be sealed with a label or tape, or you can use a zippered shielding bag to seal them. ESD-sensitive electronic components placed in the anti-static shielding bag are the only way to protect from electrostatic discharge. Not completely sealed anti-static shielding bags are not fully able to provide anti-static protection.

b. Removing the charge from the ESD shield

When receiving ESD-sensitive components sealed in a shielding bag, you should always remember to place the closed shielding bag on an anti-static work surface before removing the product. This will help eliminate any charge that may have accumulated on the surface of the shielding bag.

c. Do not overuse the shielding bag

If there is no damage to the shielding bag, it is possible to reuse it. However, if you find any tears, rips or excessive wrinkles on the static control bags are signs that should be discarded.

d. Shielding bags are not ESD workstations

ESD shielding bags are only designed to prevent ESD-sensitive products from being damaged by static electricity. If you want to handle ESD-sensitive products, please use a properly grounded ESD workbench.

e. Do not use shielding bags for ESD-sensitive products

Do not use shielding bags as "ESD insulation pads" or "ESD gloves" to handle ESD-sensitive products, as shielding bags do not provide any ESD protection for the product. You must wear a wired wrist strap or grounded heel strap to handle ESD-sensitive equipment.

How to purchase static shielding bags reclosable?

ANTITECK provide lab equipment, lab consumable, manufacturing equipment in life sciences sector.
If you are interested in our static shielding bags reclosable or have any questions, please write an e-mail to, we will reply to you as soon as possible.

    AntiTeck Life Sciences Limited

    A1-519, XingGang GuoJi, Yingbin Road, Huadu, Guangzhou, China, 510810
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