How is the extruder blow molding machine working?

The plastic is melted and quantitatively extruded in a screw extruder, and then formed through a dough film, and then cooled by a wind ring, and then pulled by a tractor at a certain speed, and the winder winds it into a roll.
Fundamental
The double air outlet is adopted in the automatic air ring structure, wherein the air volume of the lower air outlet is kept constant, and the air outlet is divided into a plurality of air passages, each air passage is composed of a wind chamber, a valve, a motor, etc., and the air-driven valve is used to adjust the air passage opening. Degree, control the air volume of each air duct.
During the control process, the film thickness signal is transmitted to the computer by the thickness measuring probe. The computer compares the thickness signal with the current set average thickness, and calculates the thickness according to the thickness deviation and the curve change trend to control the motor to drive the valve to move when the film is biased. When thick, the motor moves forward and the air outlet is closed; on the contrary, the motor moves in the opposite direction and the air outlet increases. By changing the air volume at each point on the circumference of the air ring, the cooling speed of each point is adjusted, so that the lateral thickness deviation of the film is controlled within the target range.

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