Suggestions from lead-free solder paste manufacturers

Lead-free solder pasteThe manufacturer's suggestions?I remember when I worked in an electronics factory before, I often came into contact with solder paste to solder products. With the rapid development of electronic component packaging technology, more and morePBGA,CBGA,CCGA,QFN,0201,01005Resistors and capacitors have been widely applied. So, what are the usage methods and precautions for contact solder paste? Now, let JJY Factory introduce it to you:

1The manufacturer of heavy metal-free solder paste suggests that the solder paste should be taken out of the freezer one day in advance and placed at room temperature for warming operation. The length of the warming time depends on the mixing method used. If the mixing method is done manually, it must be done in advance2~3Take the solder paste out of the freezer in an hour. If the mixing method is carried out by mechanical equipment, the heavy metal-free solder paste manufacturer believes that it only needs to be taken out of the refrigerator15In about minutes, the solder paste can be warmed back to the normal temperature according to the solder paste mixer. If the solder paste is released for printing without being warmed up, a large amount of water vapor may solidify on the surface of the solder paste. During the soldering process, this water vapor may evaporate and cause a "tin explosion" situation, leaving a particularly large number of solder beads on the surface of the circuit board, which may lead to Adjacent to the surface of the circuit board2A short circuit fault occurred at one spot welding position.
       2The solder paste should be used up within the period specified by the solder paste manufacturer. The surface of the solder paste within its validity period is moist. It can be used by stirring it evenly by manual or mechanical means. Before application, electronic component manufacturers must inspect the surface of the solder paste. If it is found that the solder paste is hard without heavy metals or there is solder mask precipitation on the surface of the paste, it must be processed through a special method before reuse; otherwise, many poor soldering problems will occur during the soldering process. The manufacturer of heavy metal-free solder paste suggests that the viscosity of the solder paste can also be observed. If it is found that the viscosity is too high and the solder paste cannot pass through the holes of the printed steel wire mesh smoothly, an appropriate amount of paint thinner should be added to the solder paste. After thoroughly mixing the thinner, it can be used again.
       3After warming up, take a small amount of the paste from the solder paste bottle according to the mixing. Then, take the outer cap home directly and seal it to prevent the evaporation of the flux inside the heavy metal-free solder paste The viscosity increases.
       4Solder paste manufacturers suggest that employees of electronic component manufacturers should wear rubber gloves and protective masks during specific printing operation processes. On the one hand, this can prevent the surface of circuit boards from being contaminated by body sweat. On the other hand, it can prevent the inhalation of too much flux paste component. Although this component cannot be said to have toxic side effects, too much contact with the body is definitely not of much benefit.
       5When solder paste is printed on the circuit board, it is essential to ensure accuracy. If the printing is inaccurate or the total quantity is too large or too small, the solder paste that has already been printed on the circuit board must be cleaned off. After the circuit boards have been cleaned, they should be printed again. The manufacturer of heavy metal-free solder paste suggests that ethanol and other materials should not be used in the process of cleaning the no-clean solder paste.
       6After the heavy metal-free solder paste manufacturer proposed to be printed on the circuit board, then4Within an hour, both surface mount and reflow soldering must be carried out. Beyond4The spot soldering quality of solder paste for an hour cannot be guaranteed.
       7Under normal circumstances, no-clean solder paste cannot be purchased and reused. If the solder paste on the stainless steel mesh cannot be reused after many hours, the solder paste inside can be scraped off and stored in a solder paste bottle that has been hollowed out on the same day for proper storage. If the recycled solder paste is to be used, it can be added to the new solder paste by stirring it in small amounts and frequently for application.
       8If it is not for the use of no-clean solder paste, after the circuit board is soldered, a thorough cleaning must be carried out to remove the residue left after the solder paste soldering. The cleaning process should be performed on the same day after spot soldering to prevent the residue from the solder paste soldering from corroding the circuit board and electronic components.

Summary:

1First of all, solder paste should be stored in the refrigerator at a temperature of1~10The natural environment of the degree.

2Secondly, before applying solder paste, it is essential to check whether the solder paste is within its expiration date. If it has expired, it cannot be used. It will directly affect the quality of the product. 

3When taking solder paste out of the refrigerator, if the temperature difference is too large, there is no need to open the outer cover and leave it for a period of time to avoid condensation water, which may affect the quality of the solder paste. 

4Fourth, solder paste that is not going to be used for a long time must be thoroughly mixed before application3~It takes five minutes to make it even, and then it can be applied. 

5Fifth. If you find that the solder paste is rather dry, you can use a special paint thinner for solder paste. Carry out the blending and then do a good job in application. 

6Sixth, during each spot soldering process, take only the amount of solder paste needed. If it is not necessary, put it back in the refrigerator at a constant temperature12Solder paste that is older than a few hours should be damaged.

The solder paste of Shenzhen JJY brand has gone through many years12A solder paste and wire manufacturer specializing in the annual research and development of solder paste, solder wire, solder wire, lead-free solder paste, leaded solder paste, solder rods, leaded solder paste, etc. Choose the solder paste of JJY brandSolder paste manufacturer.