In the last article, we talked about the first and second steps in the process of producing composite wood decking. Today we started the third step, starting the extrusion process and needing attention.
Composite wood decking starts to squeeze
- Make sure that there are no impurities in the hopper or the remaining particles of other colors before, so as to avoid the color of the composite wood decking produced is not pure.
2. Check whether the vacuum equipment of the extruderis unobstructed, and ensure that the vacuum is not less than -0.08mpa. The vacuum drum should be cleaned twice per shift. Do not use metal tools to clean the vents and use plastic or wooden sticks to clean the vents of the barrel.
3. Check whether the hopper is equipped with a metal filter. The granular material is treated by metal filtration to remove the metal impurities mixed in the particles, which reduces the wear of the metal impurities on the inside of the equipment and ensures the perfect fusion of the formed plastic wood profiles.
4. Whether the cooling water system is in normal operation, the perfect cooling water system is the necessary equipment for cooling after the plastic wood is extruded, and the timely cooling treatment can ensure the good shaping of the plastic wood profiles.
5. Install the plastic wood end play, install the specified mold according to the profile that needs to be produced.
6. Check that the pneumatic cutting machine and other screw components are working properly.
7. Forming
Thecomposite wood decking that has just been extruded has a higher temperature and needs to be manually placed on a flat surface. After the profile is completely cooled, it is processed and packaged. Even this step is simple, it is very important.
If the project ignores these details, the factory materials will often be flawed. Uneven plastic wood is likely to cause uneven thickness on the upper and lower surfaces of the product after the later grinding process. In addition, the unevenness of the profile will bring certain difficulties to the construction and affect the landscape effect.
The second step in the production of wood plastic (WPC)- granulation
In the introduction of the previous article, we explained all the most important raw materials about wood-plastics （WPC) , and how to distinguish the quality of raw materials, and the quality of raw materials will affect quality.
Today we will continue to explain the next step, the raw materials ratio is good, will be poured into the granulator to stir and start granulation.
According to the raw materials mixed according to a certain ratio, the extruded plastic wood pellets are dried by high-temperature fusion, and bagged for use. The main function of the granulation equipment is to realize the process of pre-plasticizing wood powder and plastic, and uniformly mixing the biomass powder material and PE plastic under molten conditions to pre-process the production of plastic wood materials. Due to the poor fluidity of the composite wood melt, the design of the wood-plastic (WPC) granulator and the plastic granulator are not exactly the same. The design of the granulator is also different for different plastics. The granulator usually used for polyethylene usually uses a conical twin-screw extruder because polyethylene is a heat-sensitive resin, and the cone-type twin-screw extruder has strong shearing force and the screw length is parallel. The twin-screw extruder is short, reducing the residence time of the material in the barrel. The outer diameter of the screw is tapered from large to small, so the compression ratio is quite large, and the material can be plasticized more fully and evenly in the barrel.
Next time we will move to next step. Any question please don’t be hesitate to contact us by : [email protected]