The extrusion molding equipment mainly includes two par […]
The extrusion molding equipment mainly includes two parts of the main machine and the auxiliary machine. The main machine is called an extruder, which is composed of an extrusion system screw, a barrel, and a feeding device. The advantage of the screw as an extruder has a very important influence on the quality and output of the extruder product.
The main function of a screw is to transport materials, heat transfer plastic materials, and mix and homogenize materials. In order to achieve these functions of the screw and adapt to changes in the physical state of the material, conventional conventional full-thread screws are designed in three stages.
The first section is a feeding section, also called a conveying section, which is a section extending forward from the material feeding port. Generally, the pitch of the screw is equal, and the screw depth is also equal, that is, the screw is equidistantly equal. The second segment is the compression segment, also known as the migration segment.
The screw of this section is not equidistant, mainly in order to adapt to the change of material state, and the volume of the screw is gradually reduced. The third paragraph is the homogenization section, also known as the metering section. The screw of this section is equal to the same depth as the feeding section, but the depth of the groove is shallower in the depth of the feeding section.
|screw of blow molding machine|