1, circuit board material selection

　　Recommend to choose high Tg sheet

　　For thick copper circuit boards, due to the thicker copper, its thermal conductivity is stronger. When mounted under the same conditions, common Tg boards are more prone to problems such as delamination and white spots compared to high Tg boards.

　　PCB board selection

　　2, drilling

　　For thick copper circuit boards, due to the thick copper thickness and the superposition of various layers, the copper is already at a large thickness. When drilling, the long-term friction of the drill in the board is likely to cause drill wear or breakage. , And then affect the quality of the hole wall, and further affect the reliability of the product.

　　Board drilling

　　3, line

　　For thick copper circuit boards, due to the thicker copper, the processing difficulty is greater than that of ordinary boards when etching the circuit. Therefore, increasing the line width and spacing in the design helps to reduce the difficulty of etching processing, and there is also a greater improvement in the lamination filling.

　　PCB circuit

　　4, pressing

　　For thick copper circuit boards, due to the thicker copper, the thicker the copper, the deeper the line gap. In the case of the same residual copper rate, the amount of resin filling required will increase, you need to use multiple prepregs (PP) to meet the filling, when the resin is less, it is easy to cause lack of glue delamination and poor thickness uniformity;

　　When the thick copper circuit board is laminated, due to the superposition effect of the inner layer circuit and the limitation of resin flow, the area with high residual copper rate after lamination will be thicker than the area with low residual copper rate, resulting in thick circuit board. Uneven. Therefore, the uniformity of copper paving in the inner layer should be improved as much as possible during the design.

　　thick copper circuit board pressing

　　5, solder mask

　　For thick copper circuit boards, due to the thick copper thickness, problems such as substandard ink thickness, sag, false copper exposure and air bubbles are likely to occur during solder mask production. The industry usually adopts two solder mask printing and two exposure methods to achieve this. Our company now has electrostatic spraying equipment to support the effect better.

　　PCB circuit board solder mask

　　Shenzhen Technology Co., Ltd., as a professional PCB circuit board supplier, focuses on high-precision double-sided/multilayer circuit board production, high-end HDI boards, thick copper circuit boards, blind and buried PCB boards, high-frequency circuit boards and PCB proofing And the production of small and medium-sized plates.

　　12-layer blind buried via PCB circuit board/circuit board

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