Machine structure, taking 80 blown film machine as an example: (different models, different specifications)
The first part of the feed heating zone is divided into 5 zones:
Mast (6CM diameter), housing 8, 7CM, 11kw motor (host) drive. The heating zone is divided into one, two and three from the inlet.
The next turn is upward, which belongs to the four heating zone. The machine is called three-way, one-way three-zone, two-way change net exit, three-way five-zone
The fifth heating zone, that is, the discharge zone, is turned to the top through the 3-port, called the membrane head, which is the most critical part of the machine. The accessory is a blower.
The second part is the traction zone, which is blown up and compressed, and the total height is about 3 or 5 meters. The fitting is an air pump.
The third part is the winding area.
The main materials are: low pressure polyethylene HPPE with high pressure polyethylene LLDPE mixed materials, low pressure material is mainly about 80%, the higher the pressure is added, the better the tension, the disadvantage is that there is no stiffness, too much will cause the film to blow out Swing, so that the film that is blown out is not clean, and even can not be blown at the end.
The film blowing process begins:
First, after the first, second, and third districts are preheated, one area should be lower, generally 170 degrees, and other areas should be about 200 degrees. If the temperature is high, it is impossible to send it from the screw or even burnt.
Next is the four districts, namely the three links. The three-way 60-mesh filter is designed to prevent impurities from entering the five zones. The larger the mesh, the finer the mesh, and the thinner the film, including the transparency of the film, the smoothness of the handle, the tension, etc. Wait, but too much too much will prevent the passage of the material, and if it is too much, it will not blow out. Usually 3-5 pieces are suitable, and the thickness is determined according to the requirements.
After feeding to the five zones, the discharge port becomes a 7cm diameter round and sticky paste through the film head, and the temperature of the material is basically stable. The appropriate temperature of the heating process is controlled according to the discharge condition, and the film is too high. And charred discoloration, too low to pull the film. The film thickness unevenness must be adjusted by the film head twist.
Then there is the traction zone. After the air is blown into the air bubble of the film head, the gas is added to the middle of the round film, and the film is linearly upward. The size of the plastic bag is controlled by the blowing amount, and then the film is stabilized by the film stabilizer. The thickness is controlled by the main engine and the traction speed. It can be understood that the faster the main engine speed is, the faster the feeding speed is, the thicker the film is; the opposite is the pulling, the faster the pulling, the thinner the film, which is the most important link.
In order to achieve a good horizontal and vertical tensile force of the blown film, it is necessary to achieve a certain ratio of blow-up ratio BUR and traction ratio DDR.
If the imbalance is proportional, the transverse pulling force will decrease. If the existing die and the folding diameter are used, the bubble is stable, that is, the BUR has no problem. If the bubble is unstable, the BUR is too large;
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