After PCBA has been used for a period of time, it needs to be cleaned, because each product has a different level and the cleaning process is also different, and each device has its own cleaning plan. After buying PCBA, you need to test the product to see if it is aging. This kind of test is necessary. Let’s take a closer look at “PCBA cleaning steps and test descriptions”.
PCBA cleaning steps
Brief introduction of several advanced PCBA cleaning processes At present, many PCBA production and manufacturing have used cleaning processes. For products with different levels of requirements, fluxes used, and differences in processes, the cleaning agents that need to be used, the required equipment, The crafts are all different. Most of the equipment supply has introduced the cleaning machine equipment and its cleaning plan, and firstly detects and analyzes the residue after welding in the manufacturing plant, and then provides a targeted system cleaning solution.
There are fully automated online cleaning machines, semi-automated offline cleaning machines, manual cleaning machines, etc., suitable for all water-based (cleaning with ionized water), semi-aqueous (cleaning with aqueous chemical substances, such as saponification liquid) and All chemical solvent cleaning. Many companies tend to adopt water-based cleaning agents and develop in an environmentally friendly direction.
1. Fully automated online cleaning machine
A fully automated online cleaning machine, which is thoroughly effective against organic and inorganic contaminants such as rosin flux, water-soluble flux, no-clean flux/solder paste, etc. on the surface after SMT/THT PCBA soldering Of cleaning. It is suitable for large-scale PCBA cleaning. It uses safe and automated cleaning equipment to be placed on the Denso production line, and completes the chemical cleaning (or water-based cleaning), water-based rinsing, and drying processes online through different cavities.
During the cleaning process, PCBA is cleaned in different solvents through the conveyor belt of the cleaning machine. The cleaning fluid must be compatible with components, PCB surface, metal coating, aluminum coating, labels, writing and other materials. Special parts need to consider whether they can withstand cleaning.
The cleaning process is: board loading → chemical pre-washing → chemical cleaning → chemical isolation → pre-rinsing → rinsing → spraying → air cutting drying → drying
2. Semi-automated offline cleaning machine
A semi-automatic off-line type, this cleaning machine thoroughly and effectively cleans organic and inorganic contaminants such as rosin flux, water-soluble flux, no-clean flux/solder paste, etc. on the surface after PCBA soldering of SMT/THT . It is suitable for small batch and multi-variety PCBA cleaning. It can be set anywhere on the production line through manual handling. It can complete the chemical cleaning (or water-based cleaning), water-based rinsing, and drying processes in a cavity offline.
During the cleaning process, PCBA usually needs to be fixed by a fixture or placed in a basket. The cleaning fluid must be compatible with components, PCB surface, metal coating, aluminum coating, labels, writing and other materials. Special parts need to be considered whether they can withstand Clean.
The placement density and placement angle of PCBA in the cleaning basket have certain requirements, and these two factors will have a direct impact on the cleaning effect.
3. Manual cleaning machine
A manual cleaning machine (also called a constant temperature cleaning tank), which is aimed at the residual rosin flux, water-soluble flux, rosin flux, no-clean flux/solder paste, etc. on the surface of SMT/THT PCBA after soldering. , Inorganic pollutants are thoroughly and effectively cleaned. It is suitable for the cleaning of small batch samples of PCBA. Through temperature control, it is adapted to the manual cleaning process of MPC microphase cleaning agent and completes the chemical cleaning in a constant temperature bath.