In SMT processing, SMT processing cleaning agent is a more commonly used product, and the operation is simple and safe. But I believe that many people don't know the classification of SMT cleaning agent and the purpose of each classification. The following Sanjing will give you a brief introduction.

SMT processing cleaning agents are mainly classified according to the solvent composition: organic polar solvents, organic non-polar solvents, alkaline solvents, etc. We will introduce these solvents in turn.

2. Organic non-polar solvents: There are many kinds of organic non-polar solvents, such as various hydrocarbons and alkanes. Although they are flammable solvents, they are not flammable and have good solubility, but they have a large residual amount and are not easy to dry. It will cause some damage to the PCB, so it is generally recommended to use it on the cleaning machine.

3. Alkaline solvents: the dissolving performance is better, but it is easy to remain. It is better to have rinsing equipment and drying equipment to better remove the residue.

However, SMT processing cleaning agents are also divided into different types according to their uses, such as online SMT steel plate cleaning, PCB cleaning, and ultrasonic cleaning.

On-line SMT steel plate cleaning, the machine automatically adds solvent to the wipe paper. Adding methods include spraying, dripping, etc., which require good volatility, low residue, and non-flammable. Because too much residue will dilute the solder paste, which will affect the printing effect.

PCB cleaning. The safety of the substrate is required. If the PCB board often has reverse (return) whitening, it means that the selected solvent is not compatible with the solder residue.

Ultrasonic cleaning. Some ultrasonic cleaners integrate a variety of cleaning functions, but it is worth noting that if a flammable solvent is selected, the exhaust pipe must be cleaned separately, and it should not be combined with the general exhaust pipe of the workshop to avoid fire accidents. . If a water-based solvent is selected, the machine should be equipped with rinsing and drying functions.

SMT reflow furnace cleaning. In order to reduce damage and corrosion to the machine, alkaline solvents are generally not used. If you use volatile solvents, you must pay attention to drying for a period of time after cleaning. You don't need to heat the furnace during drying, just turn on the fan.

The above is about the classification of SMT processing cleaning agent solvents, I hope it can be helpful to everyone!