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Contact Printing Methods for Solder Paste Printers

2024-06-11 13:54:25
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  The contact printing method of a solder paste printer relies on several key mechanisms and steps to accomplish accurate printing of solder paste. The following is a detailed explanation of the contact printing method of solder paste printing machine:

  System Composition: The solder paste printing machine generally consists of loading plate, adding solder paste, embossing, and circuit board transmission and other mechanisms. Working principle: loading plate: first, the already made stencil (usually called template) installed in the printing machine, to ensure that the

Solder Paste Printing Machine

 stencil and the circuit board to be printed (PCB) corresponds to the location of the exact match. Adding Solder Paste: The appropriate amount of solder paste is added to the stencil. This is usually done through an accurate solder paste application system to ensure uniformity and the right amount of solder paste. Imprinting: The stencil is then brought into close contact with the PCB by the imprinting mechanism of the printing press. During this process, the left and right squeegees of the printing machine will help the solder paste to leak evenly onto the PCB through the mesh holes on the stencil (corresponding to the pad positions on the PCB). PCB Transportation: After completing the print run, the PCB is transported through the transfer table to the next process, usually an automated mounter for subsequent placement. Key Steps and Parameters: Squeegee Control: Squeegee strength and speed are key parameters in the printing process. The proper squeegee strength ensures that the stencil is in close contact with the PCB, while the proper speed helps the paste to roll evenly and enter the mold. Paste Characteristics: The composition and characteristics of the paste (e.g., alloy type, melting temperature, reflow temperature, etc.) can also affect printing. For example, the melting point of Sn63/Pb37 alloy solder paste is about 183°C, which is suitable for common soldering temperature of electronic circuits. Printing quality: Printing quality directly affects the subsequent soldering quality and overall product reliability. Therefore, in the printing process, you need to strictly control the parameters of each link to ensure the uniformity and accuracy of the solder paste.

  In summary, the contact printing method of the solder paste printing machine is a complex but accurate process that involves the collaborative work of multiple mechanisms and steps. By accurately controlling the parameters of each link, the uniformity and accuracy of the solder paste can be ensured, thus improving the soldering quality and reliability of the product.

  Translated with DeepL.com (free version)