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Presumably, many friends who like wood plastic products want to know how is wood plastic processed, so today’s content will help you answer this doubt.
The wood plastic composite material contains plastic, so it has a good elastic modulus. In addition, because it contains fiber and is fully mixed with plastic, it has physical and mechanical properties such as compression resistance and bending resistance equivalent to hardwood, and its durability is significantly better than ordinary wood materials. The surface hardness is high, generally 2 to 5 times that of wood.
Wood plastic processing
Some artificial zeolite can be added to the polymer. This aluminosilicate molecule captures the powder and can absorb the peculiar smell in the material. Through a large number of crystalline cavities in the powder, the adsorbent can capture small organic molecules that produce peculiar smell. Molecular capture adsorbents have been successfully applied to polyolefin extrusion pipes, injection and extrusion blow molding utensils, insulation packaging materials, extrusion outer packaging and sealing materials. Molecular adsorption powder can also be added as a desiccant to plastics to remove moisture.
Extruded products of different sizes and shapes increase the diversity of wood plastic composites.
When the profile is not required to have a continuous sheet structure or the components have a complicated structural design, the wood plastic profile can be formed by injection molding or compression molding. Processors sometimes have to face the problem of how to completely fill the wood plastic material during processing. In order to solve this problem, they need to reduce the amount of wood filler to increase the fluidity of the melt.
Since 200°C is the upper limit of the processing temperature for wood plastic composites, some resins with a melting point exceeding 200°C, such as PET, cannot be used for wood plastic composites.
Moisture will degrade the performance of the composite material and also help to breed microorganisms, so the moisture must be removed before using the wood filler. The wood filler should be dried before processing, and the moisture content after treatment is generally required to be less than 1 to 2%.
The current wood plastic composite material processing machinery requires feeding equipment, drying equipment, extrusion equipment and molding equipment, as well as some necessary downstream equipment such as cooling water tanks, traction equipment and cutting equipment.
Wood plastic treatment
Appropriate additives are needed to modify the surface of polymer and wood flour to improve the interface affinity between wood flour and resin.
High-filled wood powder has a poor dispersion effect in molten thermoplastics, resulting in poor melt fluidity and difficulty in extrusion molding. Surface treatment agents can be added to improve fluidity to facilitate extrusion molding.
The plastic matrix also needs to add various additives to improve its processing performance and the use performance of its products.
Through the introduction of this article on how is wood plastic processed, do the friends who love wood plastic have a better understanding of wood plastic products?