1. Overflow caused by COVERLAY manufacturing process

So, FPC soft board manufacturers should strictly inspect the incoming materials. If the overflow exceeds the standard during the incoming material sampling, they should contact the supplier to return or exchange the goods. Otherwise, it is difficult to control the overflow during the production process.

2. Glue overflow caused by storage environment

It is best for FPC soft board manufacturers to establish a dedicated freezer to store the protective film. If the storage conditions do not meet the requirements and cause the CL adhesive system to become damp, low-temperature pre drying of the CL can greatly improve the overflow of the CL adhesive. In addition, CL that has not been used up on the same day needs to be promptly returned to the freezer for storage.

3. Local glue overflow caused by independent small PAD positions

This phenomenon is the most common quality abnormality encountered by most FPC soft board manufacturers in China. If process parameters are changed solely to solve adhesive overflow, it will bring new problems such as bubbles or insufficient peel strength. Therefore, the process parameters can only be adjusted reasonably.