PCB (Printed Circuit Board), also known as Printed Circuit Board or Printed Circuit Board in Chinese, is an important electronic component that supports electronic components and provides electrical connections for electronic components. Due to its use of electronic printing technology, it is called a "printed" circuit board.

　　The early 20th century to the late 1940s was the embryonic stage of the development of PCB substrate materials industry. Its development characteristics are mainly reflected in the emergence of a large number of resin, reinforcement materials, and insulation substrates used by professional PCB manufacturers for substrate materials during this period, and preliminary technological exploration has been made. All of these have created necessary conditions for the emergence and development of the most typical substrate material for printed circuit boards - copper-clad board. On the other hand, the mainstream PCB manufacturing technology, which uses metal foil etching (subtraction method) to manufacture circuits, has been initially established and developed. It plays a decisive role in determining the structural composition and characteristic conditions of copper-clad panels.

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