The screw configuration plays an important role in the extrusion process of wood-plastic composites. Reasonable screw structure can reduce the friction between the screw and the wood fiber, and produce appropriate shearing and dispersing mixing, so that the material system containing a large amount of wood powder can be well plasticized uniformly.
Mold design and cooling stereotypes.
In addition to ensuring a smooth transition of the runner design and reasonable flow distribution, wood-plastic composites have higher requirements for pressure building capacity and temperature control accuracy.
To obtain good fiber orientation and product quality, it is necessary to ensure that the machine head has sufficient pressure building capacity and long setting sections, even in the compression section and the shaping section.
Wood-plastic composites have poor thermal conductivity, and their products are mostly shaped profiles. It is difficult to set and cool, and water-cooling is often used. The cooling runner is reasonably designed to ensure efficient cooling.
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