In the field of electronic manufacturing, the quality of PCB is directly related to the performance and stability of electronic products. Etching is a key link in the PCB manufacturing process, and its quality has a decisive impact on the quality of the entire PCB.
From etching quality to etching interlayer, from excessive etching to anti-corrosion dry film bite, to etching equipment maintenance, any slight deviation may cause a series of serious problems, which in turn affect the final yield and reliability of PCB. In-depth analysis of various problems in the etching link in PCB manufacturing:
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Etching quality problem: Etching quality requires that all except the copper layer under the anti-corrosion layer be removed cleanly, including the consistency of wire width and the degree of side etching. If the etching is not thorough or the side etching degree is not properly controlled, the line spacing will become narrower or even short-circuited.
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Etching interlayer problem: When the thickness of the electroplating layer is higher than the thickness of the dry film, it may cause incomplete etching and produce interlayer short-circuit abnormalities. This situation is especially common in products with high wiring density.
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Over-etching: If the etching is excessive, the line will become thinner or even open, affecting the integrity of the circuit.
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Anti-corrosion dry film bite: After the anti-corrosion dry film is bitten, it will affect the integrity of the circuit, and even directly lead to scrapping, which brings great risks to production stability and quality assurance.
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Improper maintenance of etching equipment: Insufficient equipment maintenance will lead to uneven etching and make the PCB scrapped. Therefore, keeping the equipment clean and regularly replacing wear parts are key.
From the above analysis, it can be seen that the electroplating link in PCB manufacturing requires strict control of process parameters and equipment maintenance to ensure the quality and reliability of the final product.
The preventive measures for these undesirable phenomena include optimizing process parameters, strengthening equipment maintenance, and improving the professional skills of operators.
