What are the steel mesh hole opening methods in SMT assembly?

inSMTIn the surface mount technology processQFN(Quad Flat No-LeadPackaging is widely used due to its high integration and good heat dissipation performance. To achieve accurate component positioning and welding, steel mesh is printedSolder pasteIt played a key role in the process. Now, let's discuss it together with Shenzhen JJY Solder Paste ManufacturerSMTIn the patchQFNThe opening method of steel mesh:

When making printed solder paste, small holes corresponding to the positions of components will be opened on the steel mesh to facilitateSMTDuring the surface mount process, solder paste is transferred to through a steel meshPCBThe target area on it.

QFNThe common opening methods of steel mesh include square hole type, round hole type and oval hole type. The square hole type is to make small square or rectangular holes on the steel mesh, andQFNThe pin sizes of the package are matched to makeSMTDuring the surface mount technology (SMT) processing, solder paste can be accurately printed. The round hole type is to open small circular holes on the steel mesh, which can provide better positional accuracy and alignment. The elliptical hole type is designed for different sizes and arrangementsQFNEncapsulation, with oval small holes opened to meet different needs. Furthermore, it can also be based onSMTThe specific requirements of the surface mount technology (SMT) processing technology adopt other opening methods, such asTCharacter holes, irregular-shaped holes, etc. Choosing the appropriate perforation method for steel mesh requires considering multiple factors, includingQFNThe pin size, arrangement mode, component spacing, solder paste viscosity of the package and the capacity of the production equipment, etc. Reasonable design and selection of steel mesh opening methods can improveSMTThe soldering quality of surface mount technology ensures the stable and reliable electrical performance of electronic products.

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