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Stencil

The design of stencil opening is one of the main means to optimize the SMT process, and it is also an important factor affecting the quality of the SMT process. The opening design of the stencil mainly includes the shape of the hole, the size of the hole, and the stencil thicknesses.
 
The SMT stencil is designed for printing solder paste onto the circuit board. Therefore, the stencil surface will be engraved with many openings. When printing the solder paste, the solder paste should be applied on the stencil. The board will be placed under the stencil, and then a scraper (usually a scraper, because the solder paste is similar to a toothpaste-like viscous material) is brushed over the stencil surface with the solder paste, and the solder paste is squeezed. It will flow down from the opening of the stencil and stick it to the top of PCB board. When the stencil is removed, it will be found that the solder paste has been printed on the board.

To put it simply, the stencil is like a hood to be prepared when painting, and the solder paste is equivalent to lacquer. The hood is engraved with the pattern you want. When you spray the lacquer on the hood, the desired pattern appears.
 
SYS Technology Co., Ltd. specializes in various SMT stencil fabrication, solder paste, red glue research and development, cutting magnetic steel sheets, patch fixtures, furnace fixtures, machining, production and SMT accessories industry for many years. Over the years of continuous accumulation, the customer base has accumulated as many as thousands, covering the Pearl River Delta, the Yangtze River Delta, Northeast China, North China and other regions.
Precision SMT stencil
Precision SMT stencil

SysPCB - Professional Stencil Production

 
With superb technology, high-quality service and advanced management model, we have won wide recognition in the industry, and are a fast-growing and reputable SMT formwork manufacturer in the formwork industry in recent years, with a well-trained sales force With experienced technical engineers, we have accumulated rich practical experience in stencil opening design, printing effect, and material selection, and are ahead of the same industry in major aspects such as tin release performance and tin bead protection in printing, so as to provide customers with excellent service. 
 
It solves the bad phenomena such as virtual soldering, continuous soldering and solder balls in the SMT placement process, and ensures that customers successfully take the key step from solder paste to reflow soldering process in the production process. It has achieved the effect of no-cleaning; it has brought effective cost control to various enterprises and institutions, and greatly improved the efficiency of electronic industrial production and product quality. 
 
Since its establishment, the company has always attached importance to the training of company personnel and the introduction of advanced equipment. With high-quality talents as the core, high-precision equipment as the foundation, and advanced technology as the foundation, the company provides customers with more thoughtful and faster services.
SMT stencil inspection
SMT stencil inspection

About laser stencil cutting:

 
The laser stencil cutting accuracy can reach 3um, which makes the hole position accuracy and hole shape accuracy of the stencil extremely high;

1. The equipment adopts high-end optimized fiber laser source, professional optical path design, the cutting surface is smooth and smooth, without burrs, matching with post-processing such as characteristic polishing, so that the steel mesh has excellent demoulding performance;

2. The opening is in the shape of an inverted cone, which is conducive to the release of solder paste, which is convenient for clean and fast printing, and is conducive to accurately and clearly coating the pad position with the ideal shape and position;

3. Use genuine professional software to process data, the size and shape of the opening can be scaled arbitrarily, and the opening data can be processed according to customer requirements;

4. The steel mesh of the size of the cutting steel sheet can be manufactured, which is suitable for various printing;

5. Cutting thickness range: 0.03mm-0.40mm, thin and thick material steel mesh can also be processed, also suitable for other precision metal sheet and parts manufacturing;

6. It has the function of repositioning, which can accurately fill the hole at the designated position of the finished steel mesh, has the ability of fine processing, can provide ultra-precision steel mesh, the minimum opening is 30 um, the shape is good, and there is no deformation caused by thermal effects;

7. Professional data processing personnel who combine years of experience, customer requirements and excellent software to make the stencil have the most suitable design for printing, welding and reliability;

8. The half-engraved optical identification point has a large contrast, clear black and white, and strict quality inspection and control to ensure that each steel mesh is accurate in size, beautiful inside and outside, and durable;

9. Steel sheet imported from Japan, domestic high-grade AB plastic sealing net, stable steel net tension, solvent-resistant cleaning, long-term use without breaking the net.
SMT stencil microsection
SMT stencil microsection

3 types of SMT stencil production process

 
 
According to the processing methods, basically the classification of SMT stencil can be divided into three categories, that is: chemical etching process, laser cutting process, electroforming process.

These are the differences in production methods, but the preliminary steps are basically the same. For example, customers provide ready-made PCB circuit boards, which are scanned and drawn into production files; or they are directly provided with drawings (i.e. PCB design files or Gerber files etc. that can be processed by computers), these are sent to the SMT stencil manufacturer, and then the engineering department of the SMT stencil manufacturer conducts pre-production design processing to make finished documents suitable for final processing, and then get it to the production department for production.


 

solder paste printing principle


With the development of SMT stencil, more than 95% of the stencil in the SMT processing industry is made by laser cutting. Next, let's briefly introduce the three production methods, advantages and disadvantages of corresponding SMT stencil:

1. Chemical etching: Apply a layer of acid-proof glue on the steel plate, remove the glue where the opening is needed, exposing the steel plate, and corrode the steel plate with acid to form an opening. The effect of using this kind of stencil is not very good.

2. Laser cutting: It is very simple to use laser to directly drill holes in the place where the opening is needed. This kind of steel plate is the most used and the price is relatively cheap.

3. Electroforming: This kind of stencil is based on laser cutting. Then inner wall and the opening chamfer are electroformed at the opening, so that the inner wall of the opening is very smooth, which is good for solder paste printing. This kind of steel plate is very expensive and is not used much, unless there are special requirements for the SMT process, it is generally not used.

If you need SMT stencil, it is best to purchase SMT stencil according to your actual situation. If the opening is very simple, you do not need to mount very precise components (including 0.5mm or below pitch IC, 0201 chip material, etc.), chemical etching method can fully meet your needs.


 

So what are the advantages and disadvantages of laser stencil compared with other type stencils?

 

(1) Advantages:

 
Compared with etched stencil and electroformed stencil. Laser SMT stencil is simple to make, fast, accurate, easy to use, and affordable. After the laser stencil is electropolished, the quality is better and the effect is better. At present, most stencil of SMT processing on the market use laser cutting.
 

(2) Disadvantages:

 
The thickness is fixed one, the ladder stencil cannot be made, and the treatment of irregular shapes of rounded corners and chamfers is not perfect.
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