An ordinary pcb board proofing production line needs more than 20 million yuan, multi-layer boards need to invest 50 million yuan, and HDI needs to invest more than 200 million yuan. Due to the huge industry, the division of labor is very fine, there are single-station process outsourcing specializing in drilling, etc., and low-grade products are oversupplied.

　　HDI and other high-end printed circuit board industry is a capital, labor-intensive industry, management and technical requirements are relatively high, often become the bottleneck of capacity expansion.

　　Glass fiber yarn: glass fiber yarn processing by silica sand and other raw materials in the kiln calcined into liquid, through the PCB through the very small alloy nozzle to draw very fine glass fiber, and then hundreds of glass fiber twisted into glass fiber yarn. Kiln construction investment is huge, for the capital intensive industry, 30,000 tons of kiln needs 400 million yuan, the new kiln needs 18 months, the business cycle is difficult to master, and once the ignition must be 24 hours uninterrupted production, and after five years or so, must be small production half a year maintenance, enter the exit cost is huge.

　　Glass fiber cloth: Glass fiber cloth is one of the raw materials of copper clad plate, made of glass fiber yarn, accounting for about 40% of the cost of copper clad plate (thick plate) and 25%(sheet).

　　Glass fiber cloth manufacturing and weaving enterprises are similar, you can control the speed to control the production capacity and quality, and the specifications are relatively single and stable, since the Second World War almost no big changes in specifications. Unlike CCL, the price of glass fiber cloth is most affected by supply and demand, and the price has fluctuated between $0.50 and $1.00 / meter in recent years. The upstream and downstream relationship is the key to the operation, the price of a loom is 100,000 to 150,000, generally more than 100 sets can be normally produced, but the subsequent heat treatment and chemical treatment equipment of PCB proofing has higher capital requirements, up to tens of millions of samples, and the production capacity of weaving is easy to expand and more flexible. Taiwan and China now account for about 70 per cent of global production capacity.

　　Copper foil: Copper foil is the raw material accounting for the largest proportion of the cost of copper clad plate, accounting for about 30%(thick plate) and 50%(sheet) of the cost of copper clad plate, so the price increase of copper foil is the main driving force of the price increase of copper clad plate. Copper foil is widely used, not only in the copper clad plate industry, when the copper clad plate industry is depressed, copper foil manufacturers can switch to other uses of copper foil. The price of copper foil is closely reflected in the price of copper, with the rising price of copper, copper foil manufacturers transfer the cost pressure to the downstream. Copper foil processing industry PCBA template processing high technical barriers PCB lead to insufficient domestic supply of samples, high-grade copper foil still need a large number of imports, the cost of investment is also very large.