An antistatic device is a device that reduces, reduces, or inhibits electrostatic discharges; stacking or discharging static electricity, which can damage electrical components such as computer hard drives, and even turn on flammable liquids and gases.
Many methods are available to neutralize, its various uses and effectiveness depend on its application. An antistatic agent is a chemical compound that can be added to an object, or packing an object, to help prevent static electricity buildup or discharge. For the neutralization of static charges in larger areas, such as factory floors or workshops, antistatic systems may utilize electron emission effects such as corona or photoemission releases that introduce ions to areas that join and neutralize electrically charged objects. In many situations, sufficient ESD protection can be achieved by electrical grounding.
Video Antistatic device
Symbology
Various symbols can be found on the product, indicating that the product is electrostatically sensitive, such as a sensitive electrical component, or that it offers antistatic protection, just like an antistatic bag.
The reach symbol
The ANSI/ESD S8.1-2007 standard is most commonly seen in electronics-related applications. Some variations consist of a triangle with the hand reached inside using a negative space.
Versions of the symbol will often have the hand crossed out as a warning for a protected component, indicating that it is ESD sensitive and will not be touched unless antistatic precautions are taken.
Another version of the symbol has a triangle surrounded by an arc. This variant refers to an antistatic protective device, such as an antistatic wrist strap, rather than a protected component. It usually does not display a crossed-out hand, indicating that it makes contact with a secure component.
Circles
Another common symbol is a thick circle punctuated by three arrows. Originating as a U.S. military standard, it has been adopted throughout the industry. This is intended as a representation of a device or component that is violated by a static charge, indicated by an arrow.
One version of a circle with three arrows can be seen to the left of this image.
Maps Antistatic device
Example
Types of antistatic devices include:
Antistatic Bag
An antistatic bag is a bag used for storing or sending electronic components that may be susceptible to damage caused by static discharge (ESD).
Iconizing bar
An ionized bar , sometimes referred to as static bar , is a type of industrial equipment used to remove static electricity from a production line to remove static cling and other phenomena that would interfere with its path. This is important in the manufacturing and printing industry, although it can be used in other applications as well.
The ionizing rods are most often suspended above the conveyor belt or other equipment in the production line where the product can pass under it; distances are usually calibrated for specific applications. The bar works by emitting an ionized corona to the product underneath. If then a product on the line has a positive or negative static charge, since it passes through the ionized aura created by the bar, it will attract the simultaneously charged and negative ions and become electrically neutral.
Anti-static clothing
antistatic clothes or antistatic clothes are required to prevent damage to electrical components or to prevent fire and explosion when working with flammable liquids and gases.
One way to bind or connect personnel electrically to the ground is the use of ESD garments. The ESD outfit has a conductive thread in it, creating a wearable version of the faraday cage. ESD Clothing tries to protect sensitive ESD devices from dangerous static charges from clothing such as wool, silk, and synthetic fabrics to the people who work with them. In order for these clothes to function properly, they must also be connected to the ground with a rope. Most ESD clothing is not conductive enough to provide a personal base so that antistatic foot straps and antistatic wrist strap are also worn. ESD clothing is considered an optional method for controlling ESD.
An ESD protected area is a designated location with the necessary materials, equipment, and equipment capable of controlling static electricity to a level that minimizes damage to ESD vulnerable items. In ESD protected areas, all conductors in the environment, including personnel, must be bonded or connected electrically and attached to artificial ground or soil. This appendix creates an equipotential balance between all goods and personnel. Electrostatic protection can be maintained at potential above the "zero" ground voltage potential as long as all items in the system have the same potential.
Antistatic clothing is used in many industries such as electronics, communications, telecommunications, and defense applications. As computers and electronics become increasingly widespread in consumer products, more and more manufacturers have to implement anti-static control measures. One such measure is antistatic clothing because people are the largest source of electrical charges in the workplace.
Transport of electrostatic sensitive devices also requires packaging that provides protection from electrostatic hazards in transport or storage systems. In the case of a designated ESD protected area with a continuous foundation of all conductors and dissipative goods (including personnel), packaging may not be necessary.
The amount of static electricity we feel varies according to factors such as our body size and legs. Larger bodies and larger legs require more costs to be stored to produce the same voltage. Our clothing material is made of and our shoes soles can affect static electricity as well. The weather also affects it. There is more static charge when air is dry. Most people feel harmless shocks of about 2,000-4,000 volts. However, electrical components can be damaged with just a few volts. It is estimated that between eight percent and 33 percent of product losses --- the proportion of products deemed wrong --- is due to static electricity. Static electricity is generally not harmful to the individual but if uncontrolled, the release of static electricity can cause product damage to electrostatic sensitive devices and cause machine rest time, lost working hours, returned products and warranty costs especially in the semiconductor and electronic industries, Antistatic mat
An antistatic floor mat ( or ground bed is one of a number of antistatic devices designed to help eliminate static electricity. This is done by having a controlled low resistance: a metal mat will hold the grounded parts but will shorten the exposed parts; insulation mats will not provide a reference to the ground and will not provide grounding. Typical resistance is in the order of 10 5 to 10 8 ohm between the points on the mat and ground. Mats will need to be grounded (earthed). This is usually done by connecting to the ground path in an electrical outlet. It is important to dispose at a slow rate, therefore the resistors should be used in unpacking the mat. Resistors, as well as allowing high voltage loads to leak onto the earth, also preventing shock hazards while working with low-voltage parts. Some ground mats allow you to connect the antistatic wrist strap to them. Versions are designed for placement on floors and tables. Antistatic wrist strap
An antistatic wrist strap , an ESD wrist strap , or a bracelet is an antistatic device used to secure a person securely on highly sensitive electronic devices , to prevent the accumulation of static electricity in their bodies, which can lead to the release of static electricity (ESD). It is used in the electronics industry by workers working on electronic devices that can be damaged by ESD, and also sometimes by people working around explosives, to prevent electrical sparks that can trigger an explosion. It consists of an elastic band of fabric with a fine conductive fiber woven into it, attached to a wire with a clip at the end to connect it to a ground conductor. The fibers are usually made of carbon or rubber filled with carbon, and the rope is tied with a buckle or stainless steel plate. They are usually used in conjunction with antistatic mats on the workbench, or special static-disappearing plastic laminates on the surface of the workbench.
Wrist strap is usually worn on non-dominant hands (left wrist for right-handed person). It is connected to the ground via a circular drawn cable and 1 megohm resistor, which allows a high voltage charge to leak through but prevents shock hazards when working with low voltage parts. Where higher voltages are present, extra resistance (0.75 megohm per 250 V) is added on the road to the ground to protect the wearer from excessive currents; this usually takes the form of a 4 megohm resistor in a circular cable (or, more commonly, a 2 megohm resistor at each end).
Wrist straps designed for industrial purposes are usually connected to earth bond points, built-in groundwork connections, either through standard 4 mm or 10 mm male stud plugs, while ropes designed for consumer use often have crocodile clips for ground connections.
In addition to wrist straps, ankles and heel straps are used in industry to reduce the accumulated charge from the body. These devices are not usually tethered to the ground, but combine high resistance in their construction, and work by discharging an electrical charge onto a special floor tile. Such ropes are used when workers have to move in the work area and the ground wires will block the road. They are used primarily in the operating room, where oxygen or explosive anesthetic gases are used.
Wrist strap "Wireless" or "dissipative" is available, claiming to protect against ESD without the need for ground wires, usually with air ionization or corona discharges. This is widely considered ineffective, if not fraudulent, and instances have been tested and proven to be malfunctioning. Professional ESD standards all require wrist strap cable.
See also
- Electrostatic sensitive device
- Antistatic Agents
References
Source of the article : Wikipedia
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