What are the requirements of Wood Plastic Machine for raw materials

1. Requirements for wood fiber raw materials
Fiber size and shape: The length, width and shape of wood fiber have an important impact on the processing and product quality of wood plastic machine. Generally speaking, the length of wood fiber is moderate, and too long fiber may cause blockage in the screw or mold of the machine. For some special wood plastic machines, such as twin-screw extruders, the shape and size of wood fiber are relatively tolerant, but they also need to be within a certain range to ensure that they can be effectively mixed in the meshing area of ​​the screw to avoid fiber agglomeration.
Fiber moisture content: The moisture content of wood fiber must be strictly controlled. Excessive moisture content will cause bubbles during processing, affecting the quality and appearance of the product. Generally, the moisture content of wood fiber should be controlled below 10%. Because during the heating and plasticizing process of the wood plastic machine, moisture will turn into water vapor, destroying the structural integrity of the wood plastic material and reducing the strength and density of the product.
Fiber purity: The purity of wood fiber is required to be high, and impurities should be minimized. Impurities may include bark, soil, metal fragments, etc. These impurities can affect the normal operation of the machine. For example, metal fragments may damage the screw or mold, while impurities such as bark and soil can affect the performance of the wood-plastic material and reduce the quality and stability of the product.
2. Requirements for thermoplastic raw materials
Plastic type and performance: Different types of thermoplastics are suitable for different wood-plastic products and processing techniques. Commonly used ones include polyethylene (PE), polypropylene (PP) and polyvinyl chloride (PVC). PE has good flexibility and corrosion resistance, PP has high strength, and PVC has good hardness and flame retardancy. When choosing plastics, performance indicators such as its melt flow rate (MFR) need to be considered. Plastics with suitable MFR can be better plasticized and extruded in wood-plastic machines.
Dryness of plastics: Thermoplastics also need to be kept dry. Moisture can affect the plasticization effect of plastics and may even cause chemical reactions such as hydrolysis of plastics during processing. Generally, the water content of plastics is required to be between 0.1% and 0.5%, so as to ensure smooth melting and mixing with wood fibers in wood-plastic machines.
Plastic particle uniformity: The size and shape of plastic particles should be as uniform as possible. Uneven particles may cause uneven feeding during the feeding process, affecting the stable operation of the wood plastic machine. Moreover, uniform particles are conducive to better heating and plasticization in the barrel, improving production efficiency and product quality.
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