Does The Processing Temperature Affect The Wood Plastic?

The effect of processing temperature on the properties of wood-plastic composite materials is mainly affected by the temperature of the barrel and the temperature of the die during the extrusion process. The barrel temperature mainly has a decisive influence on the mixing and plasticizing effect of composite materials. The temperature of the die has an important influence on extrusion molding.

With the increase of barrel temperature, the apparent viscosity of the melt of the composite system decreases. For the extrusion processing of materials, increasing the temperature will help increase the fluidity. The first group of experiments set the temperature of the extruder higher, but the increase in temperature caused the wood fiber to burn, resulting in too low viscosity to produce enough The high pressure of the extruder and the high temperature of the extruder make the viscosity of the material drop, which is not conducive to cooling and shaping, and it is easy to cause welding marks on the surface of the product, making the surface of the product rough, poor strength, and affecting the extrusion quality, and the extrudate is on the cross section The heating process is uneven, and the wavy shape appears due to the elastic recovery of the melt after the exit mold, which affects the appearance quality of the product.

Therefore, on the basis of satisfying the plasticization quality of the material, the temperature of the extruder should be reduced as much as possible.

The temperature control of the transition section from the die of the die to the cooling and setting die has a significant impact on the quality of extruded products. If the temperature in this section is too low, the viscosity of the wood-plastic composite material will increase and the flow will be difficult, and the material flow at the runner wall will be cooled and solidified prematurely, so that the material cannot fill the die runner and it is difficult to extrude. The temperature of the section increases, the surface quality of the extruded product is greatly improved. When the material flows through the transition section into the flow channel of the shaping section, it is in a molten state. In order to fully shape the molecules, the temperature of the machine head should be controlled in sections, that is, the temperature is gradually reduced. It can be seen that for the extrusion molding of wood-plastic composite materials, the temperature of the die is very critical, and it directly affects the quality of the extrusion molding.