How is solder paste made?

The main materials that need to be prepared to make solder paste include tin powder and flux. Among them, tin powder is the main ingredient and flux is the auxiliary ingredient, and they can improve the soldering quality and workmanship.

The process of making solder paste mainly includes the following steps:

1, material preparation, tin powder, flux quality control, operating environment control: solder paste production requires solder powder and matching flux ready, flux one night in advance to return to room temperature, the quality meets the requirements. Temperature and humidity to meet the requirements of the control of solder paste production.

2, flux mixing: pour the required weight of flux into the stirring pot at a certain speed and stir evenly. The ratio of solder powder and flux needs to be adjusted according to the specific process requirements and product performance, the general content of tin powder in about 90%.

3, add tin powder mixing: tin powder before joining through the hand sieve, can be dispersed tin powder, while safeguarding the tin powder without large particles of foreign matter, you can add 1/2 tin powder, stirring for a period of time and then add the other half of the tin powder, adding tin powder in two times.

4、Fine processing: after stirring for a period of time, open the stirring pot, clean up the stirring paddle and the side wall of the uneven solder paste to the bottom.

5、Defoaming mixing: After mixing evenly under normal pressure, then carry out vacuum mixing for 10-20 minutes to remove the air bubbles inside the solder paste.

6、Process Inspection: Take the stirred solder paste and send it to process inspection. Check the fluidity and viscosity of the paste, if necessary to adjust, you can add the appropriate amount of additives or tin powder. This step is to ensure that the paste meets the specific process requirements.

7, defoaming and packaging: process inspection process of the solder paste into the next process, defoaming and packaging, printing type solder paste is directly packaged in the solder paste cans. Syringe type solder paste also need to carry out the second defoaming process.

8,  finished product inspection: the mixing of good solder paste for performance testing, mainly including solder life test, viscosity adhesion test, viscosity stability test, electrical performance test, etc., to ensure product quality and stability.

8、Labelled into the warehouse: The made solder paste will be divided into packages and stored in sealed containers to prevent moisture and dust and other contamination. At the same time, it is necessary to put a label on the container to indicate the production date of the solder paste, production batch and other information.

There are also some important control factors that need to be taken care of during the production of solder paste. For example, stirring time, stirring speed and stirring method will affect the quality and performance of the solder paste. Stirring time is generally between 30 minutes and 4 hours, and stirring speed is about 10-30 rpm. if the stirring time is too long or the speed is too fast, it may affect the quality and performance of the solder paste.

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