How should lead-free solder paste be effectively managed during its use?

Lead-free solder pasteHow should it be effectively managed during the process? The quality of tin powder and the stability of solder paste will affect the service life of the solder paste, and the stability of solder paste is the key factor determining whether the solder paste dries easily. When using solder paste, we will ask the manufacturer to fully defrost it after taking it out of the refrigerator3-4After a few hours, stir by hand before use3-5So, how can lead-free solder paste be effectively managed during use? Let's explain it to you below:

The storage temperature of lead-free solder paste is2-10℃Between them, but when in use, the recommended optimal operating environment temperature is20-25℃The relative humidity is30%-60%. As the temperature rises every time10℃The chemical reaction rate will double. Excessively high temperatures will increase the evaporation rate of the solvent in the solder paste and the reaction rate between the flux and the tin powder, thus making the solder paste prone to drying out. If the temperature is too low, it will affect the viscosity and expansibility of the solder paste, and it is prone to poor printing.

1. Production and usage personnel should assess the weekly or monthly usage of lead-free solder paste, make rough statistics, keep records for the next purchase, and register when receiving solder paste(Such as the quantity, the specific time and time of the collection date, etc)bySMTThe supervisor directly controls. Employees must use empty solder paste bottles to change solder paste;It is strictly prohibited to change the solder paste privately.

Second, special attention should be paid when using solder paste. It must not be mixed with other solder pastes. All related supporting tools, such as scrapers, must be specified. When leaving the warehouse, the principle of first-in, first-out must be followed. Do not let the solder paste be stored in the cold storage for too long;It is recommended that the solder paste be left after opening the lid12Use it up within hours. If you need to store it, please put it in a clean empty bottle, then seal it and store it back in the freezer;When printing is paused: If the printing operation needs to be paused for more than40Every minute, it is best to scrape the solder paste on the steel mesh into another empty bottle to avoid it drying out and causing waste.

When using solder paste, if necessary, protect the excess pads with transparent tape to prevent waste caused by adding solder. New operators should receive on-the-job training. When employees use lead-free solder paste, they should be taught to add solder correctly. It is strictly forbidden to add too much solder to the solder joints, which may cause waste.

Shenzhen JJY has carried out mutually beneficial cooperation with electronic raw material producers. At the same time, it also produces solder wire, solder bar, solder paste and flux paste for other enterprises. With a rich variety of successful cases in the research and development of chemical raw materials, our overall strength has created a sales market that is of high quality and honest and trustworthy