Flex PCB rigid board is required in opening the lid plate soft region, the open end and the process parameters can cause improper solder resist breakage at the junction and FR4
The hard and soft bonding plate sits require a hard plate opening cover in the soft plate area, so improper opening process and parameters can lead to FR4 and welding breakage at the joint
The hard and soft joint plate needs to be opened in the soft plate area, so improper opening process and parameters will lead to FR4 and solder joint damage<br>