The air heater heating element stainless steel electric heating pipe. The heater cavity set up more Baffled extend the residence time of air in the heater cavity, in order to improve heat exchange efficiency. Appropriate to increase the number of heating pipes, air heater installed power, and can shorten the production line to drive the heating time. The meltblown process on the draft air heater temperature control precision are higher, and the draft air temperature required to stabilize within the range of ± 1 ° C.