The hot press is a kind of equipment that heats two parts coated with soldering flux and tinned in advance to a temperature sufficient to melt and flow soldering tin, and forms a permanent electrical mechanical connection between the parts and soldering tin after curing. The heating rate can be selected according to different products.

Hot press includes constant temperature hot press, pulse hot press, double station hot press, double indenter pulse hot press, desktop hot press, etc. As the pitch of PCB or FPC in consumer electronic products tends to be smaller, the traditional soldering process has been difficult to meet the requirements of ultra-fine hot pressing. ACF process has been gradually applied by mobile phone designers.