Operating principle of PE film blowing machine

PE film blowing machine is a mechanical equipment that heats and melts plastic particles and then blows them into films.

(1) The production process and production principle add the dry polyethylene particles into the hopper, and the particles enter the screw from the hopper by their own weight. When the particles contact the inclined edge of the thread, the rotating inclined edge will generate a thrust perpendicular to the plastic, pushing the plastic particles forward. In the process of moving, due to the friction between the plastic and the screw, the plastic and the barrel, as well as the collision and friction between the particles, At the same time, it is gradually dissolved due to the external heating of the barrel. The molten plastic is filtered by the machine head to remove impurities and comes out from the die mouth of the die head. It is cooled by the wind ring, blown and expanded through the herringbone plate, and rolled into a cylinder by pulling | rolling.

(2) The main structure of film blowing machine is mainly composed of extruder, die head, die head, cooling device, foam stabilizer, herringbone plate, guide roller, coiler, etc

1. The extruder is mainly composed of screw, barrel hopper, reducer and drive motor. The drive motor is electromagnetic speed regulating motor (or frequency conversion ordinary motor), which drives the reducer through belt drive to make the screw rotate in the barrel; The plastic melted by the plastic particles in the hopper under external heating is extruded from the die head and die mouth through three-way filtration

2. Tee, consisting of filter screen, filter plate and tee gland

3. Die head

4. Cooling device, consisting of cooling air ring, air duct, blower, etc

5. Traction, consisting of traction frame, herringbone plate, guide roller, coiling mechanism, traction motor and other main parts

6. The electrical control part and general units are equipped with unit operation cabinet. The main power is turned on by pressing the main button, and the main switch of the motor is turned on. The machine body and tee can be controlled by the separate button switch respectively. The two groups of coils in the key parts of the electric heating of each button of the die are automatically temperature measured and controlled by thermocouples. During the normal production process, the temperature can be automatically controlled to ensure the stability and reliability of the production process. There are many kinds of film blowers, including PE, POF, etc.

The new material is blown out with brand new particles. The color is uniform, clean, and the bag is well stretched. Some people also use recycled plastic bags to make particles. These particles are generally called old materials. They are usually gray when making particles. Pigment is usually added when making bags. The bags are uneven in color, brittle and fragile, and the price is low.

Although it is a recycled plastic bag, it is generally a waste bag in the bag making process, which is quite different from the garbage plastic in the general sense.

Film blowing machine produces film which is suitable for various film packaging. The film can be widely used for light and heavy packaging due to its good barrier property, freshness preservation, moisture resistance, frost resistance, oxygen isolation and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid drinks, medical supplies, etc.

Precautions for installation of PE film blowing machine: When installing the film blowing machine, pay attention to adjusting the center line of the extruder head to keep it horizontal and vertical with the center of the traction roll, and do not deviate from the skew. Please pay attention to the coordination between the traction speed and the winding speed due to the gradual increase of the winding outer diameter during winding. Please adjust the price of the film blowing machine in time. After the main engine is started, pay close attention to the operation of the main engine, and timely adjust and correct the electrical instruments and controllers to ensure their normal operation. The main engine gear box and traction reduction gearbox shall be refueled frequently and the gear oil shall be replaced. For new machines, please replace the gear oil after 10 days of use to ensure the normal operation of all rotating parts. Pay attention to refuel to prevent seizure and overheating damage. Check the fastening of all connecting parts to prevent the bolt from loosening. The compressed air in the bubble tube should be kept in an appropriate amount, because the compressed air will leak out during the traction process, please supplement it in time.