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Why PCBA cleaning?
In the PCBA processing process, solder paste and flux will produce residual material, the residue contains organic acids and decomposable ions, of which organic acids have a corrosive effect, ions remaining in the pad will also cause a short circuit, and these residues in the PCBA board is relatively dirty, but also does not meet the customer's requirements for the degree of product cleaning. At the same time will also affect the stability of the PCBA board, so PCBA cleaning is very necessary.
PCBA cleaning is one of the most important processes necessary for electronic assembly, for different levels of standard products, the flux selected and through the process of differentiation, the need to select the cleaning agent, the need for machinery and equipment, processes are not the same.
The vast majority of PCBA cleaning equipment manufacturers have released the cleaning equipment, machinery and equipment and cleaning implementation programme, and first of all, the production of manufacturers of electric welding welding residues after the detection and analysis of impurities, followed by the provision of purposeful system cleaning solutions. There are fully intelligent in-line cleaning equipment, semi-automated off-line cleaning machine, human cleaning equipment, etc., there are applicable to the full aqueous (with ionised water cleaning), semi-aqueous (with organic compounds in aqueous solution, such as saponification solution) and full chemical solvents for pipeline cleaning. Many PCBA companies tend to choose aqueous cleaning solutions and are moving towards green manufacturing.
PCBA Cleaning Equipment
3 common methods of PCBA cleaning
1. Fully intelligent online PCBA cleaning
It applies to a large number of PCBA cleaning, the choice of safe and intelligent cleaning equipment placed in the electrical production line, the use of different cavities online to carry out chemical cleaning (or aqueous cleaning), aqueous rinsing, drying all the process. Cleaning process, PCBA using cleaning equipment conveyor belt in different solvent cleaning chamber, cleaning solution must be compatible with electronic devices, PCB circuit board surface layer metal plating, aluminium plating, labels, lettering and other information, special parts need to consider whether they can withstand cleaning.
PCBA cleaning process: into the board -> chemical pre-wash -> chemical cleaning -> chemical isolation -> pre-rinse -> rinse -> final spray -> air cut and dry -> drying.
2.Semi-automatic off-line PCBA cleaning
It is suitable for small quantities of many kinds of PCBA cleaning, the use of human transport can be set up in all areas of the production line, offline in a cavity to carry out chemical cleaning (or water-based cleaning), water-based rinsing, drying all the process. Cleaning process, PCBA generally need to work fixture stable or put into the basket (basket) to start, cleaning fluid must be compatible with electronic devices, PCB circuit board surface layer, metal plating, aluminium plating, labels, lettering and other information, special parts need to consider whether they can withstand cleaning.
3.Artificial cleaning PCBA
Artificial cleaning equipment for SMT PCBA soldering surface layer residual rosin flux,water-soluble flux,rosin flux,no-clean flux / solder paste and other organic and inorganic pollutants to carry out the full effectiveness of the cleaning.
Manual cleaning PCBA for small batch samples PCBA cleaning, the use of temperature control, adapted to the MPC micro-phase cleaning agent manpower cleaning process, in a constant temperature tank to carry out chemical cleaning. Special attention is paid to ultrasonic cleaning as a low-investment, easy to implement the implementation of the programme has also been selected by some PCBA manufacturing producers.
PCBA in cleaning
Work requirements for cleaning PCBA
1.PCBA or surface welding components without special requirements, all products can be used to clean the PCBA board with special cleaning agents.
2.Part of the electronic components are prohibited from contacting the special cleaning agent,such as: key switches, network sockets, buzzers, battery cells, LCD display, plastic components, dial switches, lenses and so on.
3.The cleaning process,can not use tweezers and other metal direct contact with the PCBA,so as to avoid damage to the PCBA board, scratches.
4.PCBA board after component welding,because the flux residue over time will produce corrosive physical reaction,so should be cleaned as soon as possible.
5.PCBA board after cleaning, should be placed in the 40-45 degrees in the oven,after half an hour of baking,such as drying and then remove the PCBA board for the next process.
Note on cleaning PCBA
1.After cleaning PCBA, the board surface can not be left flux, tin beads and tin slag.The surface and solder joints should not be white or grey.
2.After cleaning PCBA, the board surface can not have sticky.Must wear static electricity hand ring when cleaning work.
3.In the PCBA cleaning work before you must wear a protective mask, otherwise you can not work.
4.The PCBA has been cleaned and not cleaned PCBA placed separately and labelled, prohibit direct contact with the surface of the PCBA board has been cleaned with the hand surface.