There are many tooth slits on the wall surface of the blister, and their shapes are rectangular, triangular and trapezoidal.

There is a rising air pipe in the bubble cap, and a rotating space is formed between the bubble cap and the rising air pipe.

The rising pipe is fixed on the tray, and the gas phase enters the rotation space through the rising pipe, and is ejected from the tooth slit at a certain ejection speed, forming bubbling contact with the liquid on the tray to carry out the mass transfer process.

There are 50, 80, 100, 150mm and so on in the lower diameter of the blister commonly used in industry