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How to choose the right squeegee for a solder paste printer?

Mar 06, 2026Leave a message

How to choose the right squeegee for a solder paste printer?

As a solder paste printer supplier, we understand that selecting the appropriate squeegee is crucial for achieving high - quality solder paste printing results. The squeegee plays a vital role in ensuring accurate and consistent solder paste deposition onto printed circuit boards (PCBs). In this blog post, we will discuss the key factors to consider when choosing a squeegee for your solder paste printer.

1. Squeegee Material

The material of the squeegee has a significant impact on its performance. The two most common materials used for squeegees in solder paste printing are polyurethane and rubber.

  • Polyurethane Squeegees: Polyurethane squeegees are known for their durability and excellent print quality. They have a high resistance to abrasion and chemical attack, which means they can maintain their shape and edge sharpness over a long period of time. This is particularly important when printing fine - pitch components, as a sharp squeegee edge is essential for precise solder paste transfer. Polyurethane squeegees also have good flexibility, allowing them to conform to the surface of the stencil, ensuring even distribution of the solder paste.
  • Rubber Squeegees: Rubber squeegees are generally softer and more flexible than polyurethane squeegees. They are a good choice for applications where a more gentle touch is required, such as when printing on delicate substrates or with low - viscosity solder pastes. However, rubber squeegees tend to wear out more quickly than polyurethane squeegees and may require more frequent replacement.

2. Squeegee Hardness

The hardness of the squeegee is another important factor to consider. Squeegee hardness is typically measured on the Shore hardness scale.

  • Softer Squeegees (e.g., Shore A 60 - 70): Softer squeegees are more flexible and can better conform to uneven stencil surfaces or substrates. They are often used for printing on flexible PCBs or when dealing with stencils that have a rough surface finish. However, they may not be as effective at scraping the solder paste cleanly from the stencil, which can lead to paste residue on the stencil.
  • Harder Squeegees (e.g., Shore A 80 - 90): Harder squeegees are more rigid and provide better control over the solder paste deposition. They are ideal for printing fine - pitch components and for achieving high - accuracy results. However, they may be more prone to causing damage to the stencil or substrate if used incorrectly.

3. Squeegee Blade Angle

The blade angle of the squeegee affects the way the solder paste is transferred from the stencil to the PCB.

  • Standard Blade Angles: Common blade angles for solder paste squeegees range from 45 to 60 degrees. A 45 - degree blade angle is often used for general - purpose printing, as it provides a good balance between paste transfer efficiency and stencil cleaning. A 60 - degree blade angle is more aggressive and is typically used for printing fine - pitch components or when a higher volume of solder paste needs to be deposited.
  • Custom Blade Angles: In some cases, custom blade angles may be required to meet specific printing requirements. For example, if you are printing on a substrate with a unique surface profile, a custom - angled squeegee may be necessary to ensure proper solder paste transfer.

4. Squeegee Width and Length

The width and length of the squeegee should be selected based on the size of the stencil and the PCB being printed.

  • Squeegee Width: The width of the squeegee should be slightly wider than the area of the stencil that is being printed. This ensures that the entire stencil area is covered during the printing process, preventing uneven paste deposition. A general rule of thumb is to choose a squeegee width that is 10 - 20 mm wider than the stencil width.
  • Squeegee Length: The length of the squeegee should be long enough to cover the longest dimension of the PCB. If the squeegee is too short, it may not be able to print the entire board in a single pass, which can lead to inconsistent solder paste deposition.

5. Compatibility with Solder Paste Printers

It is essential to choose a squeegee that is compatible with your specific solder paste printer. Different printers may have different requirements in terms of squeegee mounting mechanisms, pressure settings, and movement speeds.

6. Cost - effectiveness

While it is important to invest in a high - quality squeegee, cost - effectiveness is also a consideration. You should evaluate the cost of the squeegee in relation to its durability, performance, and the frequency of replacement.

solder paste stencil machinesolder paste stencil machine

  • Long - term Savings: A more expensive squeegee made of high - quality materials may have a longer lifespan and provide better print quality, which can result in long - term savings by reducing the need for rework and improving production efficiency.

Conclusion

Choosing the right squeegee for your solder paste printer is a critical decision that can significantly impact the quality of your solder paste printing. By considering factors such as squeegee material, hardness, blade angle, width and length, compatibility with your printer, and cost - effectiveness, you can select a squeegee that meets your specific printing requirements.

If you are interested in learning more about our solder paste printers or need assistance in choosing the right squeegee, we encourage you to contact us for procurement and further discussions. Our team of experts is ready to help you make the best decision for your business.

References

  • "Solder Paste Printing Technology Handbook", Author: [Author's Name], Publisher: [Publisher's Name], [Publication Year]
  • "Printed Circuit Board Assembly Guide", Author: [Author's Name], Publisher: [Publisher's Name], [Publication Year]
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