PCB structure_

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PCB structure

source:Industry News release time:2023-02-13 Article author:yu Popular:pcb

　　 PCB structure(图1)

　　PCB is composed of Copper Clad Laminates (CCL), semi -curing tablets (PP tablets), copper foil (COPPER FOIL), and welded layer (also known as Solder Mask). At the same time, in order to protect the copper foil that is exposed on the surface and ensure the welding effect, the PCB needs to be treated on the surface, and sometimes it is equipped with characters for identification.

　　1) Copper foil layer pressure plate

　　Copper foil layer (CCL), referred to as copper foil plate or copper -covered board for short, is the basic material for manufacturing and printed circuit boards. Composite materials formed.

　　It was not until 1960 that there were professional manufacturers to make single -sided PCB based on formaldehyde resin copper foil, and put them into markets such as an electrocomputer, recorder, and video recorder. Later The stable epoxy glass substrate has been applied to this day. Now more use is FR4, FR1, CEM3, ceramic board and iron flopon plate.

　　At present, the most widely used PCB made of etching method is selected on the copper -covered foil plate to etch to obtain the required line graphics. Copper foil boards mainly provide the function of conductivity, insulation and support on the entire printing circuit board. The performance, quality, and manufacturing cost of printing circuit board depends to a large extent on the copper foil board, as shown in Figure 8.

　　2) Semi -curing film

　　Semi -firing tablets, also known as PP tablets, are one of the main materials in multi -layer board production. They are mainly composed of resin and enhanced materials. The enhanced materials are divided into glass fiber cloth (referred to as glass cloth), paper base and composite materials.

　　Most of the semi -solidarial tablets (adhesive slices) used in multi -layer printed circuit boards are used as enhanced materials. The processed glass cloth is impregnated with the resin glue, and then the thin sliced material made of pre -baked is called semi -solidified tablets. Sympathetic tablets will soften under heating and cooler.

　　Due to the different yarn stocks of glass cloth in the meridian and werely direction unit, you need to pay attention to the latitude and weft direction of semi -solidified tablets when cutting. Generally, the meridian (the direction of the glass cloth curly) is the short -sided direction of the production board, and the weft direction is the weft direction is the weft direction is the weft direction is the weft direction. The long -sided direction of the production board to ensure the flatness of the board surface and prevent distortions after the production board is heated.

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