Printed circuit boards can be classified into rigid printed boards and flexible printed boards according to the materials produced. Rigid printed boards are phenolic paper laminates, epoxy paper laminates, polyester glass mat laminates, and epoxy glass cloth laminates. Flexible printed circuit board is also called soft printed circuit board (FPC).
The flexible circuit board is made of polyimide or polyester film and has high reliability and high winding. Circuit board. The circuit board has good heat dissipation, and can be bent, folded, rolled, and can be freely moved and expanded in a three-dimensional space. The FPC can be reduced in size to achieve weight reduction, miniaturization, and thinning, thereby realizing integration of component devices and wire connections. FPC is widely used in electronic computers, communications, aerospace and home appliances industries.