Anti-static brush purchase and detection methods
Anti-static brush purchase and detection methods Anti-static toothbrush type brushes sold on the market can be divided into three types: large, medium and small. They are suitable for cleaning various electronic components, PCB boards, etc., and can also clean PCB boards.
The paint brush type brush is divided into two types: a round handle and a straight handle, each of which has a size and is suitable for cleaning various electronic components, PCB boards, and the like.
Type brushes are also divided into three types: large, medium and small. They are suitable for cleaning various electronic components, PCB boards, etc., and can also be used to brush PCB boards.
Shaped brushes are specially designed for certain processes, such as long aluminum antistatic brushes for plastic printing.
Purchase:
The soft and hard selection of the anti-static brush should be determined according to the requirements of the PCB board of the component to be cleaned. If it is scratched, the soft brush should be selected, but the cleaning effect is superior.
Test Methods:
) Brush surface resistance and handle surface resistance:
Resistance test Point-to-point resistance and system resistance test electrode structure size: column electrode diameter 63 mm ± 3 mm: electrode material is stainless steel or copper; electrode contact end material conductive rubber, hardness 60 ± 10 (Shore A grade), thickness 6 mm ± 1mm, its volume resistance is less than 500Ω: the electrode weight is 2.25 kg? 2.5 kg.
The test voltage requirements are shown in Table 1.
When testing point-to-point resistance, the product (material) should be placed on the insulating table or placed in actual use. The surface resistance and volume resistance of the mesa are greater than 1x10^13Ω, respectively, and the geometric peripheral dimensions are greater than 10 cm of the material to be tested. The distance between the electrodes is 300 mm. For ground testing, the distance between the electrodes is 900 mm to 1000 mm.
When testing the system resistance, the sample to be tested (ground) should be tested for actual use. During engineering testing, the electrodes are more than 10 cm from the edge of the material being tested.
Table 1 Test voltages for different resistance ranges:
2) Triboelectric voltage test:
The friction is used to triboelectrically electrify and the frictional electrification voltage is tested using a non-contact electrostatic voltmeter. The friction electrode of the friction motor is rounded, with a diameter of 50 mm to 60 mm, a weight of 1 kg, a volume resistance of more than 1x1O^13 ohms, and a high-insulation nylon cloth (surface resistance not less than 1x1O^13 ohms. Wrapping to increase friction Coefficient (see Figure 1). During the test, the friction is started to rub the motor to rub the friction electrode with the object to be measured, and the unidirectional friction is stopped 20 times (time 20s), and the friction trajectory electrification voltage is tested with a non-contact electrostatic voltmeter within 10 seconds.