Views: 5 Author: Uplion Publish Time: 2021-11-29 Origin: Uplion
Wood plastic material production equipment
The manufacturing of wood-plastic composite materials mainly includes extrusion molding, hot press molding, injection molding and other processes, but the extrusion molding process is currently widely used and the most mature technology. According to the requirements of the production process, the equipment required for the entire production line is mainly composed of the following parts:
1. Biomass raw material preparation equipment This equipment is mainly composed of a wood chipper and a wood mill to form a mixing unit, which is mainly used for the preparation of biomass raw materials in wood-plastic composite materials. The unit is required to crush all kinds of wood and agricultural residues, and produce biomass powder materials of different particle sizes according to the requirements of product manufacturing.
2. High-speed mixing unit This unit is composed of a high-speed hot mixer and a cold mixer. The hot mixed materials enter automatically, and the cold mixed materials are cooled and mixed to remove residual gas. It is mainly used for mixing, drying, batching, coloring and devolatilization of various resins and biomass powder materials.
3. Granulation equipment The main function of the granulation equipment is to make the wood/plastic two-phase material realize the pre-plasticization process, which can realize the uniform mixing of the biomass powder material and the plastic under the melting condition, which is a wood-plastic composite product. Pre-treatment for production. Due to the poor fluidity of wood-plastic melt, the design of wood-plastic material pelletizer and plastic pelletizer is not exactly the same. For different plastics, the design of the pelletizer is also different. The wood-plastic composite pelletizer usually used for polyolefin plastics uses a parallel twin-screw extruder. The granulator used for polyvinyl chloride usually uses a conical twin-screw extruder. This is because polyvinyl chloride is a heat-sensitive resin, and the conical twin-screw extruder has strong shearing force and the length of the screw It is shorter than the parallel twin-screw extruder, which reduces the residence time of the material in the barrel. The outer diameter of the screw has a conical design from large to small, so the compression ratio is quite large, and the material can be plasticized more fully and uniformly in the barrel.
4. Extruder In the wood-plastic composite manufacturing process of extrusion molding, the extruder is the key equipment to realize wood-plastic composite manufacturing. Its performance not only has a great impact on the physical and mechanical properties of the material, but also has a great impact on the output per unit time, which affects the unit energy consumption and production cost. The extrusion models usually used in the production of wood-plastic composite materials are mainly single-screw extruders and conical twin-screw extruders. The main function of the extruder is to complete the further plasticization of the material, provide a melt with uniform temperature and uniform composition, and carry out stable and controllable conveying, so as to realize the production.