Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single-sided, double-sided, 2-40 layer multilayer professional providers, to provide customers with high-precision, high Shenzhen circuit board quality, quality assurance, reasonable prices. Modern computer motherboard and graphics card mostly use 4-layer PCB board, there are some 6-layer, or even 8 layer board. Vias (via) we just mentioned, if used in the double-sided board, then it all went through the entire board. However, in the multilayer which, if you want to connect some of these lines, it will waste some lines vias space other layers. The use of buried vias (Buried via) and blind holes (Blind vias) technology to avoid this problem. Blind hole is connected to the surface layers of the internal PCB PCB, do not have to penetrate the entire board. Buried vias only connect internal PCB solder circuit boards Shenzhen, so just do not see from the surface of the Branch Snyder Department of International Ltd. Shenzhen-Electronic Technology Co., Ltd. - The Department of Electronic Technology Company is a professional custom single panel , double-sided, 2-40 layer plywood professional supplier Shenzhen welding circuit board, providing customers with high-precision, high-quality circuit board in Shenzhen, Shenzhen solder circuit board quality assurance, reasonable prices. In this part of CCL, B grade plate may appear There are three, one is a glass cloth Shenzhen weld defects on circuit board material, and the second is a problem prepreg or out of date, and the third is a pinhole and copper oxide, and On CCL manufacturing process will produce B-level board may, a process is a glass cloth impregnated with epoxy resin at the time, not all impregnated, bubbles exist. The second is in Overlaid CCL, the pressure with the temperature right, resulting in gum or rubber, which also generates a B-level board. Above that is the core material of PCB CCL produces a B-level board, and a lot of PCB manufacturing process, will also have a lot of B-plate welding circuit board _ Newell Year (online consultation) _ Shenzhen by the Shenzhen-board Department of Electronic Technology Limited. Newell Shenzhen Electronic Technology Co., Ltd. (www.yipcb.com) (www.yipcb.com) Guangdong Shenzhen, printed circuit board leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Newell create leadership with the staff warmly welcome all inquiries negotiations to create Newell create a better future.