What technical points should be noted when printing lead-free solder paste?

    Nowadays, in this information age, the electronics industry is becoming increasingly diverse. Every young person has many essential electronic products on them. Currently, the electronic products industry does not meet the needs of many young people. To produce these electronic products, lead-free solder paste is indispensable as an auxiliary solder. Everyone is well aware of this kind of activity. Many people do not pay much attention to these matters during welding. Generally, such auxiliary materials only last for more than half a year. Therefore, in the production process of many industries, what key points should be noted? I hope everyone can be clear about this. Now, JJYSolder paste manufacturerLet me explain:

Generally, the situations that need attention include. The brush table and steel mesh should be thoroughly cleaned and finely adjusted until each hole is absolutely centered with the solder pad. The solder paste mixer should be used to stir evenly until the solder paste can fall off automatically when scraped with a stirring knife, and there are no obvious particles observed with the naked eye.

Next, let's analyze the usage precautions for everyone:  

1Before printing lead-free solder paste, the steel mesh should be adjusted and the printing table and steel mesh should be cleaned thoroughly with alcohol.

2Adjust the steel mesh The height of the fixture ensures that the steel mesh is closely attached to the platform.

4Open the cap of the lead-free solder paste bottle, take out the inner cap, and place it with the lead-free solder paste face up on a clean table.

5Use a lead-free solder paste mixer to stir evenly until the lead-free solder paste can fall off automatically when scraped with a stirring knife, and there are no obvious particles observed with the naked eye.

6After the well-mixed solder paste has completely evaporated from the plate to be washed, use a stirring knife to place it on the steel mesh.

7Put the lead-free solder paste into the steel mesh. The amount added should be such that it is just scraped off by the printing knife each time and the amount of solder paste is not less than that of the printing knife2/3It is advisable.

8Select a scraper that matches the substrate to be brushed. First, check if it is in good condition. If there is a gap, replace it.

9When using a scraper, the magnitude of the force applied is related to the printing effect. The pressure should be applied to ensure that the printed solder paste has clear edges, a smooth surface and an appropriate thickness. Appropriate pressure is conducive to prolonging the service life of the scraper and the steel mesh.

10"Will"PCBPlace the board in the direction it travels.PCBMake sure it is flat and there are no foreign objectsPCBBelow, press the steel mesh down againPCBUp.

11The Angle between the printing knife and the steel mesh from the outside of the solder paste is45-90OScrape evenly towards the larger printing area. (It's best to apply it in one go and avoid applying it a second time.)

12After scraping to the boundary of the mesh, quickly lift the printing knife and return the lead-free solder paste to the original printing position. Wipe it off to prevent brushing off the blockPCBAdhesion occurred during the board process

13After taking lead-free solder paste, randomly wipe the stirring knife and the mouth of the solder paste bottle clean, and then put the bottle cap back on to prevent the solder paste from drying up and generating solder paste particles.

14Lift the steel net for inspectionPCBCheck if the solder paste brushed on the board is adhered or missing. If it is adhered or missing, wipe it off with board cleaning water, let it dry and then brush it again.

Based on the above, everyone should be correctLead-free solder pasteIn terms of usage, everyone is also clear about how to avoid such situations. We hope this can be helpful to those in the electronics industry here during the production process. If you want to learn more about soldering, please continue to follow the online message of JJY Solder Paste Factory to interact with us.