During the extrusion production process, the structural form of the screw head should be selected according to the properties of the processed materials. Generally, for processing plastics with good thermal stability (such as polyolefins), a blunt-type screw head should be chosen, as shown in the figure.
There is a large space between the screw head and the die head, and a plate and a filter screen can be installed in front of it. However, it is easy for the materials to get stuck in front of the screw head and undergo thermal decomposition, so it is not suitable for processing materials with poor thermal stability. For processing plastics with poor thermal stability (such as PVC), a conical screw head is generally used, as shown in the figure.
Shanghai Omega Machinery Co., Ltd.
Add.: No.168 Hualian Road, Putuo District, Shanghai City
Contact: Williams Wu
Tel.: +86-021-69921527
Mobile: +86-18616920618
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