Printed circuit board specifications are more complexed, many types of products, generally classify by PCB layers, flexibilities and materials. According to the number of layers can be divided into: single-sided, double-sided and multi-layer; according to flexibility can be divided into rigid printed circuit boards and flexible printed circuit boards; by material can be divided into several categories shown in the following chart.
From the PCB layer and development direction, we can divided the PCB industry into single-sided, double-sided, conventional multilayer, flex circuit boards, HDI (high density interconnect) board, packaging substrate 6 major subdivision products. From the product life cycle “into the period – the growth stage – maturity – recession” the four-cycle dimensions of view, single-panel, 2 layer flexible PCB is no longer suitable for electronic products due to the short and thin trends currently, they are is in recession stage, The proportion reduced gradually, this kind of PCB boards are seldom produced in the developed countries a and regions, such as Japan, South Korea and Taiwan China, many big manufacturers have made it clear that no longer produce the single sided and double-sided PCB boards.
Conventional Multilayer PCB and HDI are mature products, it is the main direction for the big flex circuit board manufacturer to strive for because of the mature technology, and they are comes with the high value-added products, only a small number of ultrasonic electronics among the Chinese manufacturer master this kind of production technology; flexible PCB especially the high density rigid flexible PCB can’t go to mass production due to the current technology is not yet mature, it is growing products, but because flexible PCB and rigid-flex PCB is apply for digital products more than rigid PCB, flexible board can grow higher and higher, it is the main development direction for various manufacturers in future.