Stenter is widely used in all major industries, not only in industry, but also in life. However, with the economy and continuous innovation, many companies require product accuracy and pass rate, including product quality, and low cost, so as to achieve better economic benefits.

As for how to improve the accuracy of the screen printing machine? I will tell you all below, let's take a look!
1. First, let's understand and analyze the factors that affect the accuracy of screen printing
The graphics printing accuracy of the printed board includes the following two aspects: one refers to the small distortion of the printed graphics line width, and the line width accuracy is 0.05mm; the second refers to the high precision of the printed graphics position.
When the graphic length is within 500mm, the position is 0.15mm. There are many factors that affect the accuracy of the above two aspects. From the screen making to the graphic printing production process, the following factors are important:
1. Selection of screen-making materials and printing materials: including screen frame material, screen material, mesh number, color and printing material performance;
2. Screen printing equipment deployment, tooling: screen printing machine, positioning tooling, etc.;
3. The production process includes stretch screen, silk screen plate making, printing process, etc.;
4. Working environment conditions: The temperature, humidity and cleanliness of the working garden, especially cleanliness are important factors that affect the quality of the product;
5. People are the most important factor that affects the quality of the project, and the operator must have a high sense of responsibility and high skill nature.
Here we focus on the principle of the influence of the first few factors on the printing accuracy of the printed graphics and the steps and essentials for improving the accuracy.
 
2. Improving the quality of screen stencils is a condition to guarantee the fineness of screen printing
The factors that affect the quality of the screen template include the drawing quality of the photographic manuscript, the photography, piration and the dimensional stability of the photographic negative. The production of the screen template involves many factors such as the screen frame, the screen and the stretched screen, the plate making and the photosensitive material.
1. The choice of the screen frame material The same usually chooses LY12, LF2 and other hard alloy aluminum square tube profiles, the size is 20mm wide and 20mm thick, and the four corners are processed by argon arc welding or riveting. The metal frame has high precision and stable size;
2. Selection of screen materials Now nylon screens and polyester screens are the most widely used. Nylon wire mesh has poor heat resistance, and it is easy to produce thermoplastic deformation after being heated, which will cause uneven tension and affect the quality of screen printing. It is not suitable for high temperature baking for the production of bonded stretch screen or screen template. Polyester mesh has good heat resistance, stable size, and the pattern does not undergo major changes due to changes in temperature and humidity. In order to ensure the fineness of screen printing graphics, it is best to use monofilament polyester screen. At the same time, you should choose a screen with a higher mesh number, a finer diameter, and a smaller mesh. The color of the screen should be yellow or brown to prevent vignetting;
3. Stretching the net Stretching is the key to making high-precision printed graphics. First, the stretched net must meet the quality requirements. It is best to use a pneumatic stretcher. The quality requirements of the stretched net are as follows.
1. The tension of the stretched mesh is consistent and well-proportioned. The greater the tension, the better. If the tension is too large, it will exceed the elastic limit of the material, and the mesh will lose its elasticity, become brittle or even break. The tension is insufficient and the screen is soft and lacks resilience. Should be based on the rated tension, and then according to the operating conditions to give consideration, so that the tension on the entire screen is even;
2. The latitude and longitude meshes are connected vertically. The warp and weft threads of the stretched screen should be connected perpendicular to the edge of the screen frame as much as possible. When stretching the screen, one is the positive drawing, that is, the force is the same as the connection of the wire; the other is that the screen held by the net clamp can be stretched horizontally. mobile;
3. Lax preparedness. In order to reduce the tension of the stretched net over time, the screen will become loose or become looser as it is used, and tension will drop. The method of continuous net pulling and repeated tensioning of the net should be adopted to loosen the tension of a part of the net before the fixed net. carry out;
4. Silk screen template making process. Nowadays, the most frequently used method is the direct method to make screen stencils. In this production process, the thickness of the finely sizing coating is consistent, and the key to strict control of drying, exposure, and development can be used to obtain high quality screen stencils.
 
3. Control various influencing factors in the process of screen printing and improve the fineness of screen printing
In the process of screen printing graphics processing, firstly, excellent performance of printing materials is required, and secondly, process factors such as printing equipment deployment, tooling, squeegee, screen distance, and squeegee pressure must be strictly controlled.
1. The printing material must have the following properties: good chemical stability; suitable drying rate; good adhesion to copper-clad boards; consistent viscosity, good thixotropy, and color; good penetrating power; easy to dry;
2. Set up equipment deployment tooling. The use of a screen printer with higher printing accuracy can eliminate many artificial instability factors. The positioning tool can be directly positioned using the longitudinal adjustable positioning pin on the machine table (the positioning hole can be drilled by CNC drilling);
3. Other technological factors.
 
If you want to know three ways to improve the fineness of screen printing machines, you can refer to the above content. For more information about screen printing machines, please consult licheng Flat Screen Printing Machine Factory online.