The production process of indoor wood-plastic panels mainly includes raw material processing, mixing processing, molding and surface treatment. The specific process is as follows:
1. Raw material preparation
Wood powder preparation: Select wood for crushing, screening and drying to form wood powder with uniform particle size.
Plastic substrate: Commonly used plastic particles such as polyethylene (PE), polypropylene (PP) or polyvinyl chloride (PVC) need to be crushed into powder to enhance mixing uniformity.
Additives: Add preservatives, antioxidants, dyes, etc. according to performance requirements to ensure material stability and color effects.
2. Mixing process
Put wood powder, plastic powder and additives into the mixer in proportion and mix them evenly through high-speed stirring. The temperature needs to be controlled during the mixing process to avoid premature melting of the material.
3. Extrusion molding
Extruder configuration: A special screw extruder is used, and the screw design needs to meet the low shear and high conveying requirements to adapt to the characteristics of wood-plastic materials24. Process parameters: The mixed material is extruded under high temperature (usually 160-200℃) and high pressure. The compression ratio of the mold and the length of the shaping section affect the density and surface finish of the finished product.
Molding method: The mainstream process is one-step method (direct extrusion) or two-step method (granulation before molding). The former is more efficient and the latter is more stable.
4. Cooling and shaping
The extruded sheet needs to be quickly cooled and solidified through a cooling water tank or air cooling system, and cut into standard sizes after shaping.
5. Surface treatment
Grinding and polishing: Eliminate burrs or unevenness generated during the extrusion process to improve the touch.
Coating process: Some products are coated with UV layer or imitation wood texture coating to enhance aesthetics and weather resistance
