Industry News

recautions for storage of lead-free solder paste

Views : 97
Update time : 2022-09-29 18:18:42
The preservation of lead-free solder paste should be stored in a sealed form in a refrigerator with constant temperature and humidity (note that it is refrigerated instead of freezing). There are special freezers for lead-free solder paste on the market, and the temperature is 2℃~8℃ If the temperature is too high, the alloy powder in the lead-free solder paste does not chemically react with the flux, which will reduce the viscosity and activity and affect the performance of the lead-containing solder paste; if the temperature is too low , it will cause crystallization and deteriorate the shape of the solder paste.
During the storage process of lead-free solder paste, attention should be paid to maintaining a "constant temperature". If the lead-free solder paste is continuously changed from various environments to different temperature changes in a short period of time, It will also change the flux properties in the solder paste, thereby affecting the soldering quality of the leaded no-clean solder paste.
Scraper speed: ensure that the solder paste rolls rather than slides relative to the scraper. Generally, 10-20mm/s is appropriate;
Squeegee pressure: ensure that the printed solder joint has a clear edge, a flat surface and a suitable thickness.
Printing method: contact printing is appropriate; when using, the lead-free solder paste should be fully stirred, and then added to the printing screen according to the set amount of printing. If the dispensing process is used, the dispensing amount should be adjusted. ; In the case of long-term printing, due to the volatilization of the flux in the solder paste, it will affect the release performance of the solder paste during printing, so the container for storing the solder paste cannot be reused (only for one-time use), after printing The remaining solder paste on the stencil should be stored in other clean containers, and the remaining lead-free no-clean solder paste should be checked for agglomeration or solidification next time it is used.
Related News
Read More >>
What are the main problems that exist during the soldering process of lead-free tin bars? What are the main problems that exist during the soldering process of lead-free tin bars?
Aug .01.2023
Leadless tin strip is an energy-saving raw material that does not contain lead chemicals, also known as low-carbon and environmentally friendly welding wire. It has been successfully tested according to SGS and has no air pollution. There are several main problems that exist in the production process. Below, the solder paste manufacturer will explain:
What are the differences between tin wire and silver wire? What are the differences between tin wire and silver wire?
Jul .21.2023
Solder wire, Chinese name: Solder wire, Solder wire, Tin wire, Tin wire, English name: Solder wire, Solder wire is composed of two parts: tin alloy and flux, the alloy composition is divided into tin lead, tin copper, and other additives added evenly to the middle part of the tin alloy.
The scope of use of solder wire and solder bar The scope of use of solder wire and solder bar
Feb .09.2023
There are some things you don't know about the use of solder wire, solder bar, and the scope of use
Proper use of solder wire Proper use of solder wire
Feb .09.2023
Proper use of solder wire and commonly used auxiliary materials