The characteries of flexible circuits are thin, light weight, but easy to happen folding, scars in the process of using, and mechanical strength is small, easy to crack. Stiffener is intended to strengthen the mechanical strength of flex circuits, easy to install surface components.

Stiffener has a variety of types, according to requirements of using, mainly have PET, PI, adhesive, metal or resin reinforcement plate, etc.

There have two ways to press stiffener of flexible circuits:

1. Hot pressing of stiffener: Using high temperature to melt adhesive film of stiffener, then use of appropriate pressure or vacuum to closely fit the stiffener film on the products;
2. Sensitive pressure of stiffener: no heating, products pressure through the cold pressing machine.