PCBA Tech - Factors of poor PCB surface quality in PCBA processing

As the size of PCBA components becomes smaller and smaller, and the density becomes higher and higher; the support height between the device and the device (the distance between the PCB and the ground clearance) is also getting smaller and smaller, and environmental factors have an impact on the PCBA. The influence is getting bigger and bigger, iPCB puts forward higher requirements on the reliability of PCBA of electronic products. The following iPCB briefly introduces the factors that cause poor PCB surface quality during the production and PCBA processing process.

1. PCB substrate processing problems: especially some thin PCB substrates (usually below 0.8mm), because the rigidity of the PCB substrate is poor, it is not suitable for brushing with a brushing machine. In this way, during the production and processing of PCB substrates, it may not be possible to effectively remove the specially treated protective layer to prevent oxidation of the copper foil on the board surface. Although the layer is thin and easy to remove with a brush, it is difficult to chemically treat.

2. The phenomenon of poor surface treatment due to oil or other liquid contaminated with dust during machining (drilling, lamination, milling, etc.) of the PCB surface.

3. Poor sinking copper brushing: the pressure of the sinking copper front grinding plate is too large, causing hole deformation, brushing the hole copper foil rounded corners, and even leaking the substrate, causing sinking copper electroplating, spraying tin soldering, etc. There is blistering at the orifice; therefore, attention should be paid to strengthen the control of the brushing process, and the brushing process parameters should be adjusted to appropriate values through the wear scar test and the water film test.

PCBA

In recent years, the process of industrial modernization and the continuous rapid growth of the electronic information industry have driven the rise of the sensor market. As an important category of sensors, temperature sensors account for more than 40% of the total demand for sensors. The temperature sensor uses the characteristic that NTC resistance value changes with temperature to convert non-electrical physical quantities into electric sub-products.

Advantages of capacitive touch:

1. The control panel of capacitive touch products can be arbitrary, and the touch panel can be made of insulating materials;

2. The use of capacitive touch can improve the interaction between people and products, increase product vitality, stimulate customers' desire to buy products, and thus increase product sales.