PCB has developed from single layer to multi-layer circuit board, and still maintains its own development trend. Due to the continuous development in the direction of high precision, high density and high reliability, continuous reduction in size, cost reduction and performance improvement, printed boards still maintain a strong vitality in the future development of electronic equipment. After the electronic equipment adopts the printed board, due to the consistency of the same type of printed board, the error of manual wiring is avoided, and the automatic insertion or mounting of electronic components, automatic soldering, and automatic detection can be realized, which ensures the quality of the electronic equipment. , improve labor productivity, reduce costs, and facilitate maintenance.

　　Material of PCB board:

　　22F single-sided composite substrate: single-sided semi-glass fiber board. (Generally, it can be die punched, if the requirements are high, it can be drilled by computer)

　　CEM-1 Single Sided Composite Substrate: This material requires CNC drilling. (Generally, it can be die punched, if the requirements are high, it can be drilled by computer)

　　CEM-3 double-sided composite substrate: the lowest and low-end double-sided material, which belongs to semi-glass fiber material. (Except for double-sided cardboard, it is the lowest-end material for double-sided boards. This material can be used for simple double-sided boards, which is about 5-10 yuan/㎡ cheaper than FR-4).

　　FR-4 epoxy glass fiber board: the most commonly used material for PCB circuit boards (PCB multi-layer circuit board factories).

　　Fire rating of PCB board: According to the UL standard, the burning characteristics of the substrate can be divided into the following four categories from high to low: UL-94V0, UL-94V1, UL-94V2, UL-94HB.

　　Prepreg: used to make multi-layer PCB boards, commonly used models are 1080, 2116, 7628 and other specifications.

　　94HB cardboard: the most common cardboard material, it is basically used to make low-grade single-sided boards, and the price is cheap. Because it has no flame retardant effect, it cannot be used for a series of products with fire protection requirements such as power supplies.

　　94V0 cardboard: a cardboard material with flame retardant effect. Compared with 94HB cardboard material, its composition is added with flame retardant. (die punching)

　　A summary of the development trends of future printed circuit board manufacturing technology at home and abroad is basically the same, that is, high density, high precision, fine aperture, fine wire, fine pitch, high reliability, multi-layer, high-speed transmission, lightweight , Thin-type development, in the production at the same time to improve productivity, reduce costs, reduce pollution, to adapt to the direction of multi-variety, small batch production. The technical development level of printed circuits is generally represented by the line width, aperture, and board thickness/aperture ratio on the printed circuit board.

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