1, feeding process
The structure of the wood flour is fluffy, and it is not easy to feed the extruder screw. In particular, the phenomenon of "bridge" and "holding pole" often occurs when the wood flour contains more water.
Feeding instability can cause extrusion fluctuations, resulting in reduced extrusion quality and yield. Feeding is interrupted, and the residence time of the material in the barrel is prolonged, which causes the material to burn and discolor, which affects the inherent quality and appearance of the product.
Forced feeding device and reasonable conveying method are adopted to ensure the stability of extrusion.
2.Exhaust during processing
The small-molecular volatile substances and water in the wood flour can easily cause defects in the product, and the pre-treatment cannot completely remove them. Therefore, the design of the exhaust system of the wood-plastic composite extruder should be given more attention than the ordinary plastic extruder, and multi-stage exhaust can be performed if necessary.
To a large extent, the better the exhaust effect, the better the quality of the extruded product