wood fiber as raw material have any difference influence on WPC ?

Flour i.e. wood fiber, mainly composed of cellulose, hemicellulose, lignin. Lignin provides strength and durability for the timber, depends largely on the strength of wood lignin, lignin plant material is left remnant after acid hydrolysis residues, wood in a polymer matrix permeable to macromolecules, largely reduces the chance of cellulose decomposing bacteria, In the soft wood lignin content is higher. Usually soft wood powder particles fragmented, broadleaf timber is cylindrical.

Although lignin (wpc) mechanical properties of wood-plastic plays a major role, but there are some adverse effects of their own. Lignin is a photosensitive substance, under UV irradiation degradation will occur, which is wood and wood (WPC) materials mainly due to fading under UV light, lignin will turn gray from the brown. Lignin makes WPC material performance weakened, because in the process of flammable and releases carbon dioxide, can reduce the density of the product in the outdoor exposure will accelerate the WPC materials fade.

Hemicellulose in the process is also flammable, release mainly VOC, can reduce product density, enables the product to generate steam explosion in the production process, mainly because of a sharp moment of decompression and boiling water over the entire wet wood particles .

Wood fiber aspect ratio of WPC (wpc) material properties have a certain influence, the greater the bending aspect ratio the better the performance. This is because more fiber in the melt flow direction. Extrusion process will lead to reduced fiber aspect ratio. The larger the aspect ratio, the better the fluidity of the melt, can reduce mold shrinkage of the material.

In the wood-plastic (wpc) material, the cellulose content of more fade more serious, but the material oxidation resistance will increase, melt viscosity will increase, and the smaller the particle size of the wood flour, the higher the viscosity.

Wood usually contain tannin, and trivalent iron complexes will form a black mixed, nails around wood (wpc) plated dark spot is formed, “tannin stain.”

Some wood-plastic (wpc) material is rice husk production, compared with the wood flour, rice husk has its advantages and disadvantages. Husk high mineral content, so use rice husk produced wood (wpc) material degradation antimicrobial resistance and moisture absorption stronger and more wear-resistant.

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