Process principle
Put the dry polyethylene particles into the lower hopper, and enter the screw from the hopper by the weight of the particles. When the pellets contact the threaded beveled edge, the rotating beveled edge will generate a thrust perpendicular to the beveled edge to the plastic. Moving forward, during the moving process, due to the friction between the plastic and the screw, the plastic and the barrel, and the collision and friction between the particles, it also gradually melts due to the external heating of the barrel. The molten plastic is filtered by the machine head to remove impurities from the die orifice, cooled by the air ring, blown, passed through the herringbone plate, traction roller, and coiled to roll the finished film into a tube.
The main structure
It is mainly composed of extruder, die head, die head, cooling device, foam stabilizer, herringbone plate, traction roller, coiling device, etc.
Extruder
The extruder is mainly composed of a screw, a barrel, a hopper, a deceleration and a drive motor. The drive motor adopts an electromagnetic speed regulating motor (or a frequency conversion ordinary motor). The reducer is driven by a belt drive to make the screw rotate in the barrel; When the hopper plastic particles are heated externally, the molten plastic is squeezed from the die orifice through a three-pass filter.
Die head
This unit adopts advanced spiral die head structure. According to the particularity of high pressure, low pressure, mixed material, recycled polyethylene material, and comprehensively considered, the main technologies such as helix angle, retreat angle, shaping angle length, and die opening are designed. Parameters, selected and finalized after many comparison tests,
Cooling device
Composed of cooling air ring, air duct, blower, etc.
Traction
Composed of main components such as traction frame, herringbone plate, traction roller, winding mechanism and traction motor
Electrical control
Generally, the unit is equipped with a unit operating cabinet. Press the main button to turn on the main power supply and turn on the main motor switch. The main body and the tee can be controlled by the button switch, and each button of the mouth mold is heated. The two sets of coils in the key parts adopt thermocouples. Automatic temperature measurement and automatic temperature control. During the normal production process, the temperature can be automatically controlled to ensure the stability and reliability of the production process. There are many types of film blowing machines, including PE, POF, and so on.
The new material is blown out with brand-new particles, the color is uniform, clean, and the bag stretches well.
Some people use recycled plastic bags to make particles. This kind of particles are generally called old materials. When they are made into particles, they are usually gray. When making bags, pigments are usually added. The bags are unevenly colored, brittle and easy to break. , The price is also lower.
Use
Although it is a recycled plastic bag, there is still a big difference between the waste bag in the bag making process and the garbage plastic in the usual sense.
The film blowing machine produces film suitable for all kinds of high-end film packaging. This kind of film can be widely used in light and heavy packaging due to its good barrier properties, freshness, moisture proof, frost proof, oxygen barrier, and oil resistance. Such as various fresh fruits, meat products, pickles, fresh milk, liquid beverages, medical supplies, etc.
