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2024-03-11

The importance of compressed air quality to the PCB industry

PCB board layer is generally divided into single panel, double panel and multilayer board 3 kinds. Single-sided board is a kind of copper coated on one side, so only the copper coated side can be used to design the welding of circuit wires and components. Double-sided board is a circuit board with copper coated on both sides including TOP (top layer) and Bottom (bottom layer). Both sides can be wired and welded, with an insulating layer in the middle, which is a commonly used circuit board. Multilayer board is to add another layer between the top and bottom layers of the double-sided board, for example, a four-layer board composed of two power supply board layers is placed.

Mounter, exposure machine, drilling machine, testing machine is the PCB industry with a large demand for gas categories. The use of pneumatic drill bit is accepted by most enterprises because of its low energy consumption, fast response, can reach the required pressure and speed in a short time. However, the pneumatic drill bit has a large amount of gas. If the compressed air is not up to the standard and the water content is too large, it will cause the rotation speed of the drilling machine to be unstable, damage the pneumatic components, and bring a greater impact on the position and speed control, resulting in poor product quality and increased defective rate. At the same time, the poor quality of compressed air will damage other production equipment and affect all production links.

The process of compressed air in the operation of the drilling machine is that the dried and filtered compressed air is delivered to the rear cover through the pipeline-delivered to the front and rear peilin and the spindle housing through the internal air pipe-there is a row of uniform air holes in the spindle housing and the inner wall of the front and rear peilin. when the air enters, the surrounding air blows up the axis to suspend it in the air-when the coil passes the current after frequency conversion, magnetic field force is generated, make the shaft speed-the air compressor constantly replenishes the pressure loss to ensure the normal suspension of the shaft (in this process, if the compressed air is not dry, a certain amount of water will be produced in direct contact with the product, and it will affect the normal operation of the spindle, resulting in defective products).

The energy consumption of pneumatic drill bit is low, and the drilling speed can reach 300000 times, which is used by most production enterprises. However, the gas consumption of pneumatic drill bit is extremely large. If the moisture content in the gas source is too large, the drilling speed of drilling machine will be unstable, the pneumatic components will be damaged, and the product quality will be poor and the rejection rate will increase.

Not only that, the poor quality of compressed air will also lead to pollution of solenoid valves and cylinders, uneven drilling speed of the spindle, and damage to electronic detection equipment, exposure machines, drilling machines, and optical detection equipment.

According to ISO8573/1 standard (typical compressed air quality classification) and industry standard (JBT5967-2007 air medium quality grade for pneumatic components and systems), the basic requirements for compressed air quality in PCB industry are: water content -20 ℃ (pressure dew point), dust content 0.1 μ, oil content 0.1 cm3/m. The pressure dew point is a measure of the quality of compressed air, and for PCB production with large air consumption,The average value of pressure dew point reaches -20 ℃In order to ensure the good quality of the circuit board. However, in the current market, the compressed air quality in the PCB industry is generally not up to standard, resulting in a high rate of defective products.