PVC Mixer Machine: Why Is Mixing Important Before Extrusion?
29 September, 2026
Wood Plastic Composite (WPC) decking is a durable outdoor building material made from wood fibers or wood flour, polyethylene (PE), and functional additives. It combines the natural appearance of wood with the weather resistance and low maintenance of plastic, making it popular for patios, gardens, balconies, and public outdoor spaces.
This guide explains the complete WPC decking manufacturing process, from raw materials to finished decking boards.
Many customers want to know how to make WPC decking. The production process includes raw material preparation, mixing, pelletizing, extrusion molding, and surface treatment.
A typical PE WPC decking formulation includes:
| Material | Function |
|---|---|
| Wood powder (60–80 mesh) | Provides natural texture and stiffness
The best results are achieved by mixing 60-mesh and 80-mesh wood flour. |
| HDPE or recycled PE | Acts as the polymer matrix
It coats and wood flour, fillers, and various additives together. Without PE, wood flour alone cannot form continuous profiles. |
| Calcium carbonate (optional) | Reduces production cost and improves rigidity |
| Coupling agent | Enhances bonding between wood fibers and plastic |
| Lubricants | Improve extrusion performance |
| Stabilizers | Improve thermal stability |
| Color masterbatch | Provides the desired color |
| UV stabilizers | Improve weather resistance |
| Antioxidants | Extend product service life |
The exact formulation varies depending on product requirements, climate conditions, and target market. EANS engineering team can adjust the formulation according to your available raw materials, production capacity, and product requirements：
WPC decking manufacturing process diagram:
The complete production process typically consists of the following steps:
Wood powder, PE or recycled PE, additives, and other ingredients are accurately weighed and blended in a high-speed heating and cooling mixer to ensure a homogeneous mixture.
Benefits:
The mixed material is processed through a parallel twin-screw granulator machine, where the components wood flour, PE, and additives are melted, mixed, and compounded into WPC pellets.
Advantages of pelletizing:
The WPC pellets are fed into a conical twin-screw extruder, where they are plasticized and extruded through a specially designed decking die.
The extrusion die determines the WPC board profile, such as:
The decking board is cooled using water spray or cooling tanks to prevent deformation and maintain dimensional stability.
A synchronized haul-off machine continuously pulls the decking profile at a stable speed, ensuring smooth and consistent production.
An automatic cutter cuts the decking boards to preset lengths, commonly:
To improve appearance and slip resistance, the decking may undergo:
Finished products are inspected for:
Qualified WPC boards are then packaged for shipment.
Finished WPC decking flooring boards:
A complete WPC decking extrusion line generally includes:
Compared with traditional wood decking, WPC decking offers several benefits:
WPC decking is widely used in:
PE/PP + wood flour + additives.
A WPC decking extrusion line including mixer, granulator, extruder, mould, cooling and embossing equipment.
Yes, PE WPC has good water resistance and weather resistance.
Yes. Many manufacturers use recycled HDPE to reduce material costs while maintaining product quality.
Pelletizing improves material uniformity, feeding stability, and overall production efficiency, especially for high-output production lines.
Yes. By changing the extrusion die and calibration molds, the same WPC extrusion line can manufacture different widths, thicknesses, and profile designs, such as WPC columns, WPC wall cladding, WPC fencing board, etc.
Depending on the extruder model, output typically ranges from 150 kg/h to over 250 kg/h.
Manufacturing high-quality WPC decking requires a well-designed production process, stable formulations, and reliable extrusion equipment. From raw material mixing and pelletizing to extrusion, calibration, cooling, cutting, and surface treatment, each stage plays an important role in ensuring consistent quality and long-term outdoor performance.
For manufacturers seeking higher productivity, lower energy consumption, and consistent product quality, a complete WPC decking extrusion line with optimized compounding and extrusion technology is the most efficient solution.
