Production process and basic principle of blow molding machine

The MEPER blow molding machine is a machine that uses the wind blowing from the machine to blow the plastic body to a certain shape of the cavity after spraying the liquid plastic to make the product. The production process and basic principle of plastic blow molding machine are as follows:

I Production process of plastic blow molding machine

1. Plastic parison (extrusion of hollow plastic tube);

2. Close the flap mold on the parison, clamp the mold and cut off the parison;

3. Inflate the mold to the cold wall of the cavity, adjust the opening and maintain a certain pressure during cooling;

4. Open the mold and write down the blown parts;

5. Trim the flash to get the finished product.

II The basic principle of plastic blow molding machine

The structure of the automatic air ring adopts a double air outlet, in which the air volume of the lower air outlet is kept constant, and the upper air outlet is divided into several air ducts on the circumference. Each air duct is composed of an air chamber, a valve, and a motor. degree to control the air volume of each air duct.

During the control process, the film thickness signal detected by the thickness measuring probe is sent to the computer, and the computer compares the thickness signal with the current set average thickness, calculates according to the thickness deviation and the curve change trend, and controls the motor to drive the valve to move. When the thickness is thick, the motor moves forward and the air outlet closes; on the contrary, the motor moves in the reverse direction and the air outlet increases. By changing the air volume of 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. .