What is a soft printed circuit board?

What is a soft printed circuit board?
Starting in 1960, V dahlgreen attached a metal foil line to a thermoplastic film. Then, the flat cable is replaced to form a printed circuit line pattern on the soft insulation board. In the end of the 1960 s, after the PI (Polymide) substrate film was imported and used, so far, the software Board has continued to develop rapidly. ‧ early software boards were mainly used in small thin electronic machine structures and hard board connections (no connectors needed. Since the end of the 1970 s, it has gradually been applied to computers, cameras, printers, car audios, and hard drives. At present, the Japanese soft-board application market is still dominated by consumer electronic products, while the United States has gradually transformed from its military use to its consumption and livelihood use.
In terms of production methods, because the soft board material is quite soft and the shape is not fixed during processing, Small and Medium factories can produce multiple batches and a small number of diverse production methods; as for the continuous production of roll to roll with low costs and high production capacity in large soft board factories, most orders come from computer peripheral products such as cameras and hard drives. In addition, in terms of process technology, although the soft board is not the main construction board of electronic products, the process is relatively simple, but the difficulty is no less than hard board.