How to quickly check whether the opening area ratio of steel mesh conforms to ipc7525

stay IPC7525 Specification , For the two important parameters of area ratio and width thickness ratio , The detailed calculation formula is given , As shown in Figure 1 . In the actual printing process , When steel mesh and PCB When you separate , The solder paste is in a state of competition between the two , namely ： The solder paste will be transferred to PCB On the pad , Or stay in the hole wall of the steel mesh opening .
Studies have shown that ： When the area ratio （ That is, the ratio of opening area to steel mesh wall area ） Greater than 0.66, And the width thickness ratio is greater than 1.5 when , The solder paste can be well released to PCB On the pad . The greater the ratio , The higher the solder paste transfer rate ; conversely , There will be less tin in Figure 1 、 Cusp 、 Printing problems such as missing printing .

Figure 1 Formula of area ratio and width thickness ratio
As a SMT Process Engineer , Even if known “ The best conditions of area ratio and width thickness ratio ”, But in the face of thousands of openings , Without professional tools and software , If you want to achieve “ Verify whether each opening conforms to IPC7525 standard ”, Is extremely unrealistic . therefore , Only after the production line , Only through the welding results can we know the advantages and disadvantages of steel mesh design .
Hope friends Vayo-Stencil Designer Steel mesh digital design software scheme , It not only subverts the traditional steel mesh design to manufacturing process , It also provides more than ten functions including steel mesh verification , It perfectly solves all kinds of pain points in the steel mesh of the electronic industry .
Use to look at friends Vayo-Stencil Designer Software , The technologist can check the potential welding problems of the steel mesh with one click , Plan ahead , Avoid line stoppage 、 Quality problems 、 Customer complaints and other major anomalies .

Figure 2 Vayo-Stencil Designer Software
The software not only makes it convenient for technologists 、 Efficient independent design , And it can help enterprises establish a unified open standard library , The technologist no longer needs to spend time communicating with the steel mesh manufacturer to explain the opening requirements 、 Confirmation, etc , It's easier to specialize in process improvement , Constantly optimize the opening design 、 Improve the high reliability of products .