How to pay attention to unnecessary accidents when using solder paste for printing machines is very important for the yield rate of circuit board products. Generally, before using solder paste, we must check whether it is within the validity period. If it has expired, do not use it, as this will affect the product quality. So, how should we pay attention to these matters? Below, JJY Solder Paste Manufacturer will introduce it to youSolder pastePrinting machine usage tips and precautions:

Precautions for using solder paste printers

1When in use, it should be done at least in advance4HTake it out of the refrigerator, write down the time, number, user and applied product, seal it and place it at room temperature. Open the bottle cap when the solder paste reaches room temperature. If it is opened at a low temperature, it will easily absorb water vapor. During the re-soldering process, solder beads are likely to form. Note: Do not place the solder paste near a hot air heater, air conditioner, etc., to accelerate its temperature rise.

2After opening, it should be mixed at least with a mixer30sOr mix by hand5minMake the components in the solder paste uniform and reduce the viscosity of the solder paste.

3After the first printed circuit board is printed on the shift or the equipment is adjusted, a solder paste thickness tester should be used to measure the thickness of the solder paste printing. The test points should be selected at the top, bottom, left, right and center of the test surface of the printed circuit board5Point, record the value, and require the solder paste thickness range of the solder paste printer to be within the thickness of the screen plate-10%-+15%Between.

4. The solder paste must be within its validity period. It is stored in the refrigerator and must be thawed at room temperature before use6For more than one hour, and stir well before use to ensure that the solder paste and flux are fully mixed.

5. Solder paste must not come into contact with water or other chemical substances to avoid oxidation, corrosion and volatilization, which may affect the quality of the solder paste.

6. Steel mesh should be cleaned regularly.

7. The safety cover of the solder paste printer must not be opened when it is in operation.

Precautions for adding solder paste to a solder paste printer

1When adding solder paste to the solder paste printer, the amount of solder at all points of the solder paste rolling bar should be uniform.

2The amount of solder paste added should be appropriate, not too much. The diameter of the solder paste rolling bar should be within15mm~20mm Between;

3During the screen printing process of the solder paste printer, the solder paste that is squeezed to the outside of both sides of the squeegee,Regular sorting should be carried out.

4The solder paste is placed more than on the screen plate of the solder paste printer30When the solder paste has not been used for minutes, it should first be scooped up with a spatula and stirred before use. If the interval between them is long, the solder paste should be put back into the can and the bottle cap should be tightly closed. When used again, it should also be stirred.

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