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What is Silkscreen in High Frequency PCB ? |
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1. Definition and Function of Silkscreen |
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ISilk screen printing refers to a layer of text, symbols, or patterns printed on the surface of a printed circuit board (PCB).Silk screen includes top silkscreen and bottom Silkscreen. It is mainly used to mark the positions, models, polarities of components, as well as some other circuit information, such as the functions of test points and connectors. For example, on the PCB of a computer motherboard, silk screen printing can be seen to mark the positions of components like the CPU socket, memory socket, and chipset, and the models of the components are also labeled. This enables engineers to quickly identify each component during the assembly, maintenance, and debugging processes. |
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2. Manufacturing Process of Silkscreen |
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Silk screen printing is usually achieved through the screen - printing technique. First, a screen template with patterns or text is made. Then, ink is printed onto the PCB surface through the screen template. After the ink dries on the PCB, the silk - printed layer is formed. Silk - screen printing inks generally have good adhesion, corrosion resistance, and solvent resistance to ensure that the silk - printed information does not easily peel off or get damaged during the use of the PCB. |
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3. Importance of Silkscreen |
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Silk screen printing is of great significance for the production and use of PCBs. During the production process, it can assist workers in accurately installing components in the correct positions, improving production efficiency and assembly quality. In the later maintenance and repair stages of the product, technicians can quickly understand the functions of the PCB and component information through silk screen printing, facilitating troubleshooting and component replacement.
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4. Benefits of TMM10i's Screen Design Applications |
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When it comes to the application of silk screen in high-frequency PCBs, I can't help but think of Rogers TMM series PCBs. Taking TMM10i PCB as an instance, let's carry out a detailed explanation. |
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4-1. Rogers TMM10i High-frequency PCB |
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4.1 Stable Dielectric Properties |
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Dielectric constant: 9.80±0.23 at 10 GHz/23°C. Stable dielectric constant reduces signal reflection and refraction, minimizing electromagnetic interference on silk screen layer and ensuring clarity and accuracy.
Low loss factor: 0.0020 at 10 GHz. Reduces energy loss and electromagnetic interference, ensuring integrity and readability of silk screen information. |
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4.2 Good Thermal Stability |
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Low thermal expansion coefficient:The CTE values, which are 19 ppm/K in the X and Y directions and 20 ppm/K in the Z direction, can match copper. It ensures minimal dimensional change with temperature changes, preventing adhesion loss, cracking, or shifting of silk screen layer.
High thermal conductivity: Rogers TMM10i laminate features a thermal conductivity of 0.76 W/m/K at 80°C, which is about twice that of traditional PTFE/ceramic laminates. Dissipates heat promptly, preventing damage to silk screen layer due to overheating. |
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4.3 Excellent Mechanical Properties |
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Resistance to creep and cold flow: Maintains dimensional stability, ensuring position accuracy of silk screen patterns and text.
Chemical stability: Tolerant to etchants and solvents. Provides a stable attachment surface for silk screen layer. |
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4.4 Superior Processing Performance |
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Thickness range: 0.0015 to 0.500 inches with ±0.0015-inch tolerance. Offers flexibility in silk screen design and meets different process and performance requirements.
Processability: Compatible with standard PCB subtractive process. Facilitates production and ensures quality and consistency of silk screen layer. |
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5. Rogers TMM10i PCB Capability |
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PCB material: |
Ceramic, Hydrocarbon, Thermoset Polymer Composites |
Designation: |
TMM10i |
Dielectric constant: |
9.80 ±0.245 |
Layer count: |
Double Layer, Multilayer, Hybrid PCB |
Copper weight: |
1oz (35µm), 2oz (70µm) |
Laminate thickness: |
15mil (0.381mm), 20mil (0.508mm), 25mil (0.635mm), 30mil(0.762mm), 50mil (1.27mm), 60mil (1.524mm), 75mil(1.905mm), 100mil (2.54mm), 125mil (3.175mm), 150mil (3.81mm), 200mil (5.08mm), 250mil (6.35mm), 275mil (6.985mm), 300mil (7.62mm), 500mil (12.70mm) |
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PCB size: |
≤400mm X 500mm |
Solder mask: |
Green, Black, Blue, Yellow, Red, Purple etc. |
Surface finish: |
Immersion gold, HASL, Immersion tin, Immersion silver, OSP, Pure Gold Plated, ENEPIG, Bare copper etc.. |
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6. Concluding Remarks |
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Silkscreen in high-frequency PCBs is like a guiding star. It accurately marks component positions and information, enhancing production efficiency and ensuring reliable performance in high-frequency applications. |
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Founded in 2003, Shenzhen Bicheng Electronics Technology Co., Ltd is an established high frequency PCB supplier and exporter in Shenzhen, China, serving customers worldwide.
We are devoted to delivering high-frequency PCB products and solutions of the highest quality, along with customized service. Feel free to consult and contant at any time !
Visit https://www.bicheng-enterprise.com to learn more.
Unlock its full potential by contacting Vicky at v.xie@bichengpcb.com. |
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