The barrel is the outer cover of the screw, providing support and heating environment for the screw. The outer surface of the barrel is usually equipped with a heating device to heat the plastic particles to make them melt. The feed port of the barrel is connected to the hopper, and the plastic particles enter the screw groove inside the barrel through the hopper.
The screw is installed inside the barrel and is one of the key components of the film blowing machine. It is driven by a motor and a reducer and rotates in the barrel. The main function of the screw is to convey, compress, and melt the plastic particles, and finally extrude the molten plastic through the die. The screw is usually divided into a feeding section, a compression section, a uniform section, and a metering section. Each section has a specific function to ensure the uniformity of plastic melting and the stability of extrusion.
The screw is located inside the barrel, and the two are closely matched. The screw rotates in the barrel, pushing the plastic particles forward and melting them, while the heating device of the barrel provides the necessary heat for the plastic. This structure enables the plastic to smoothly transform from a solid state to a molten state under the joint action of the screw and the barrel, and finally extrude it into a film through the die.
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