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How high is the accuracy of SMT steel mesh and what factors affect the accuracy of SMT steel mesh?

Source: Lin Chuan precision article author: Lin Chuan precision time: 2020-02-27 12:32 reading: 1806

Since the introduction of SMT industry into China in the 1980s, it has been developed rapidly in the past 40 years, especially the use of 01005 chip components and 0.35mm spacing CSP, which also puts forward high requirements for the accuracy of SMT steel mesh. Let's introduce the accuracy requirements of modern new SMT steel mesh and the factors affecting the accuracy of SMT steel mesh.

 High precision SMT steel mesh

High precision SMT steel mesh

   The production accuracy of SMT steel mesh is as follows:

1. Opening dimension accuracy: 0-0.010mm.

2. Opening position accuracy: 0.005-0.03mm.

3. Mesh frame opening accuracy: within 2mm.

4. Material thickness: 0.030-0.600mm.

5. The center precision of graphics in the mesh frame: within 1 mm.

6. Material thickness accuracy: within 0.003.

7. Roughness of side wall (hole wall): 0.005-0.006mm.

   What factors affect the accuracy of SMT steel mesh?

1. SMT steel mesh production equipment

What kind of equipment is used to produce SMT steel mesh is very important, and the accuracy of equipment platform also determines the accuracy of steel mesh. Such as: laser machine accuracy to ensure the steel mesh opening size and opening position accuracy; electrolytic polishing machine to ensure the size of the hole produced and the actual need of the size of the accuracy.

 SMT steel mesh production equipment

SMT steel mesh production equipment

2. Manufacturing process

Before we have discussed the production process of steel mesh, we can know that the best process should be laser cutting steel mesh after electropolishing. In both chemical etching and electroforming, there are processes that are easy to produce errors, such as film making, exposure and development, and electroforming is also affected by uneven substrate.

3. Opening design

The opening design has the greatest influence on the quality of PCB steel mesh. As discussed above, the opening design should consider the manufacturing process, width thickness ratio, area ratio, experience value, etc.

 Opening design relationship

Opening design relationship

4. Testing equipment

The production process of SMT steel mesh and before shipment should be strictly inspected. Generally, the SMT user department only makes one steel mesh for a PCB, because its feature is that it does not cause loss to the SMT user department, and the delivery rate of SMT steel mesh must be 100% qualified.

5. Materials used

Including PCB mesh frame, wire mesh, steel sheet, adhesive, etc. PCB mesh frame must be able to withstand the relay of a certain program and have good levelness; polyester mesh is better used for wire mesh, which can maintain stable tension for a long time; steel sheet is better to use 304, and the matte will be more conducive to the solder paste (glue) rolling than the mirror; the adhesive must be strong enough and resistant to certain corrosion.

6. Usage

The correct printing method can keep the quality of the steel mesh. On the contrary, the incorrect printing method, such as excessive pressure, PCB mesh or PCB not level, will damage the steel mesh.

 Application of SMT steel mesh

Application of SMT steel mesh

7. Production data

The integrity of production data will also affect the quality of PCB steel mesh. The more complete the information, the better. At the same time, when the data coexist, it should be clear which is the most important. Generally speaking, the error can be reduced as much as possible.

8. Cleaning

Solder paste (glue) is easy to solidify. If it is not cleaned in time, the opening of steel mesh will be blocked, and the next printing will be difficult. Therefore, the solder paste should be cleaned in time after the PCB steel mesh is removed from the machine or printed on the printing machine for 1 hour.

9. Storage

The SMT steel mesh should be stored in a specific place, which can avoid accidental damage. At the same time, the PCB steel mesh should not be stacked together, which is not easy to take and may bend the mesh frame.

10. Printing equipment

The printing equipment used by SMT department is very important to the accuracy of steel mesh. The more intelligent the printing equipment is, the higher the accuracy of the printed products is.

Last article: What kind of production environment is needed for high quality SMT steel mesh
Next: What are the classifications of SMT steel mesh?
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