The role of the Film Blowing Machine Screw is to transp […]
The role of the Film Blowing Machine Screw is to transport, compact, melt, stir, and apply pressure to the plastic. All of this is done by the rotation of the screw in the barrel. When the screw rotates, plastic will generate friction and mutual movement between the inner wall of the barrel, the bottom of the screw groove, the thrust surface of the screw edge, and plastic and plastic.
The forward movement of plastic is the result of this combination of movements, and the heat generated by the friction is also absorbed to increase the temperature of the plastic and melt the plastic. The structure of the screw will directly affect the extent of these effects.
Ordinary injection screw structure, but also in order to improve the quality of plastic design into a separate screw, barrier type screw or split screw.
The structure of the barrel is actually a tube with a blank opening in the middle.
In the plasticizing process of plastics, the power of its advancement and mixing is derived from the relative rotation of the screw and the barrel. According to the different shapes of the plastic in the screw groove, the screw is generally divided into three sections: a solid conveying section (also called a charging section), a melting section (also called a compression section), and a homogenizing section (also called a metering section).