Wood Plastic Deck Processing
Some artificial zeolite may be added to the polymer, and the aluminosilicate molecule captures the powder to absorb the odour in the material. Through a large number of crystal cavities in the powder, the adsorbent can capture small organic molecules that produce odour. Molecular capture adsorbents have been successfully used in polyolefin extruded tubing, injection and extrusion blow moulded vessels, insulation packaging materials, extrusion overpacks and sealing materials. The molecularly adsorbed powder can also be added to the plastic as a desiccant to remove moisture from it.
Extruded articles of different sizes and shapes increase the variety of wood-plastic composites.
When the profile is not required to have a continuous sheet structure or the component has a complicated structural design, the wood-plastic profile may be formed by injection moulding or compression moulding. Processors sometimes have to deal with the problem of how to fully mould wood-plastic materials during processing. 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 of wood-plastic composites, some resins with a melting point of more than 200 C, such as PET, cannot be used for wood-plastic composites.
Water vapour can degrade the properties of the composite and also contribute to the growth of microorganisms, so it is important to remove the moisture before using the wood filler. Before the processing, the wood filler should be dried. Generally, the water vapour content after treatment should be less than 1~2%.
Wood-plastic composite processing machinery is required to be equipped with feeding equipment, drying equipment, extrusion equipment and moulding equipment, as well as some necessary downstream equipment such as cooling water tanks, traction equipment and cutting equipment.