GeneralLead-free solder paste Manage and save during the usage process? With the rapid development of the electronic information industry, micro-pitch devices have developed, and the assembly density has been getting higher and higher, giving birth to new typesSMT,MCMIn technology, the solder joints in microelectronic devices are getting smaller and smaller, while the mechanical, electrical and thermodynamic loads they bear are getting heavier and heavier, and the requirements for reliability are increasing day by day. 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 to effectively manage lead-free solder paste during use? Let's have the editor of JJY explain it to you below:

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. 

The storage temperature of a batch 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. 

Lead-free solder pasteChemical reactions always occur during the storage and use of it. Although this reaction is inevitable, under normal usage conditions, the reaction speed of the correctly designed solder paste should be relatively slow to ensure that its service life is sufficient to meet the requirements of normal production. Solder paste that dries easily is usually caused by defects in the formula design. In addition, ensuring a satisfactory usage environment and standardized operations can extend the service life of solder paste. Other factors such as solvent evaporation during use can also affect the service life, but they are not the main factors. If you want to know about solder paste, lead-free solder paste, solder paste and other soldering issues, partners are welcome to consult Shenzhen JJY Industrial Technology Co., LTD. Let's learn and grow together! The solder wire, solder paste and solder rods of JJY brand are always waiting for partners to come and take them together.