Parallel co-rotating twin screw extruder is normally made up of two-stage extruder. It can make wood flour dry and resin melting procession separate. Besides, it also can operate wood flour and plant fibers directly and then continually mix and extrude wood flour with the melting resin after wood flour is dried.
This kind of two-stage extruder [...]
Nowadays the main operation of WPC is twin screw extruder, because it delivers materials relying on the principle of positive displacement and having no pressure returning ,easy feeding ,good exhausting affection. Thus the volatile components in wood flour can be fully ruled out. The meshing of screws with each other and the strong shearing can [...]
The extruding formation can also be called as extrusion molding. It is a forming method that with the help of the extrusion affection of screw or plug screw, and the uniform plasticization melting plastic can pass the mouth model forcibly so that it can form series of products with constant cross-section.
Extrusion forming is mainly used [...]
The main trend of plastic machinery such as twin screw extruder is with portfolio structure, specialization, serialization, standardization, micro-and large-scale, personalization, and intelligence. Users can do the “mix and match” based on their actual requirements. Besides, a lot of new type equipment and special purpose equipment have been developed, due to the requirement of technological [...]
Conventional single screw extruder is not suitable for WPC forming operation, because it processes the weak ability for material transmission and plasticization. The transmission affection of single screw extruder mainly depends on the role of friction. The wood structure is too fluffy to feed, and the filling of wood structure make the polymer melt viscosity [...]
Although the screw of strong shearing cold feeding screw has a more complex configuration and higher manufacturing costs, it has widely used in manufacture for its good exhausting affection. The operation principle of strong shearing cold feeding screw is similar to that of cold feeding screw. But it has its own character.
The feeding parts [...]
Pin barrel cold feeding extruders are the breakthrough of cold feeding extruders. It can be applied to 90% of the plastic material. Pin barrel cold feeding extruders use a streaming method rather than rather than rely on a specially designed screw or setting intense heat of the section in screw.
This streaming method can turn the [...]
Feed zone of a screw extruder, which uses forward transmission components with larger pitch, can gain a larger feed capability. Besides, feed zone will compact the powder filler by following measures in order to promote melting and plasticization of materials:
a. Part the modular screw (such as co-rotating twin screw and screw of disc extruders) [...]
For the co-rotating twin screw extruder, the shear component of it is kneading disk.2 (diamond) disk kneaders can be used, which has strong transmission capacity but not very strong shear capacity. At the same time it can reduce the shear by reducing the thickness of kneading disc and increasing the wrong angle of kneading block.
Some [...]
Among single screw extruders, the pin screw extruder is suitable for the extrusion screw of wood-plastic composite extrusion system, because the pin can be cut on the material flow and repeatedly to form a new interface and then repeatedly re-oriented so that the heat of the liquid can be passed to the solid phase in [...]
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