The three-layer co-extrusion film blower enters the screw from the hopper. When the raw material contacts with the screw oblique edge, the rotating oblique edge pushes the raw material particles forward. During the pushing process, the raw material gradually melts through the extrusion friction heating and external heating. The melted raw material is extruded from the die mouth, and is blown, cooled by the wind ring, pulled up by the traction frame and pulled up by the pulling roller. The reel is reeled into thin film barrel material by reel rack.
In the course of pushing, the friction between plastic and screw, between plastic and barrel, and between particles, as well as the gradual melting due to external heating of barrel. The screw rotates in the barrel by belt drive, and the melted plastic particles in the hopper are extruded from the die through three filters under the condition of external heating. Traction is composed of traction frame, herringbone, traction roll, coiling mechanism and traction motor.
The new material is blown out with brand new particles. The color is uniform, clean and the bag is well stretched. Others use recycled plastic bags to make particles, which are generally called used materials. When they are made into particles, they are usually grey. When they are made into bags, they usually need to add pigments. The bags are uneven in color, brittle and fragile, and the price is low. Film blowing machine is to heat and melt plastic particles and then blow them into thin films.
There are many kinds of film blowing machines, such as PE, POF, PVC and so on. The new material is blown out with brand new particles. The color is uniform, clean and the bag is well stretched. It refers to a kind of plastic processing technology that melts plastic particles and blows them into thin films. Usually, polymer is extruded to form tubular film blanks. Under a better melt flow condition, the film is blown up to the required thickness by high pressure air, and then becomes thin films after cooling and shaping.
If blown film material produced by professional blower is suitable for all kinds of high-grade film packaging. Because of its good barrier, fresh-keeping, moisture-proof, frost-proof, oxygen-proof and oil-proof, the film can be widely used in light and heavy packaging. Universal low density PE (LDPE) or linear low density PE (LLDPE) are available. HDPE film grade is generally used in areas requiring superior tensile properties and good impermeability.