How to choose lead-free solder paste printing steel mesh for SMT?

Lead-free solder pastePrinting isSMTThe first process of production is directly affected by the printing qualitySMTThe welding quality. Lead-free solder paste must be used in the printing processSMTSteel mesh, then how to chooseSMTLead-free solder paste printed steel mesh?Now, Shenzhen JJY Solder Paste Manufacturer will explain it

FirstSMTSelection of the frame for lead-free solder paste printed steel mesh1.5Aluminum alloy steel mesh, by using the method of red adhesive aluminum tape, when the aluminum frame comes into contact with the adhesive, a uniform layer of protective paint needs to be applied to ensure that the surface tension of the steel mesh is sufficient and the flatness is good. The distance between the steel mesh and the frame is generally maintained at20MM-50MMBetween. The material of lead-free solder paste printed steel mesh is generally stainless steel, which is imported304#Stainless steel excels in hardness, elasticity, wear resistance and other aspects, while two-component epoxy resin has excellent flexibility and adhesion. Steel mesh opening: To ensure its hardness, the width in the opening area must not exceed2MMTo enhance the strength of the steel mesh, the size of the solder pads is larger than2MMA frame is needed in the middle0.4MMThe bridge.

Secondly,SMTSteel mesh marking on lead-free solder paste printed steel mesh: For the convenience of production, the model and time should be engraved on the steel mesh. Steel mesh thickness control: To ensure welding quality, the surface of the steel mesh should be smooth, the thickness uniform, and the spacing0.5mmQFPandHIP0402The thickness of the piece mesh plate is0.15M. The spacing is0.5MMQFPandCHIP0603The thickness of the above mesh plate components is0.5MM.

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