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The development of printed circuit board substrate materials has gone through nearly 50 years

In our daily life, there are many intelligent electrical appliances that bring us many conveniences, such as floor sweeping robots, dish washing robots, cooking robots, etc. among them, these robots inevitably need PCB boards with reliable quality in the assembly process

Substances and materials in nature can be divided into three categories: conductors, semiconductors and insulators according to their conductivity. The resistivity of semiconductor is in the range of 1m Ω· cm ~ 1g Ω· cm (the upper limit is taken according to Xie jiakui's electronic circuit, and 1/10 or 10 times of it; because the angle mark is not available, the current description is used temporarily)

There are many forms of matter, such as solid, liquid, gas, plasma and so on. We usually call materials with poor conductivity, such as coal, artificial crystal, amber, ceramics and so on, insulators. Metals with good conductivity, such as gold, silver, copper, iron, tin and aluminum, are called conductors. The material between conductor and insulator can be simply called semiconductor. Compared with conductors and insulators, the discovery of semiconductor materials is the latest. Until the 1930s, when the purification technology of materials was improved, the existence of semiconductors was really recognized by the academic community.

After the covering film of FPC circuit board is positioned, it is necessary to heat and pressurize to make the adhesive completely solidified and integrated with the circuit.

Wiring is the most important process in the entire PCB design.