How to achieve continuous and uniform extrusion in PVC wood-plastic composite pellet production line?

In the production process of PVC wood-plastic composite pellets, the extrusion granulation link plays a vital role. This link not only determines the shape, size and appearance quality of the product, but also directly affects the physical properties, chemical stability and service life of the product. Therefore, achieving continuous and uniform extrusion is the key to ensuring product quality and production efficiency.

The screw is the core component of the extruder, and its structural design and working principle have a decisive influence on the extrusion effect. The screw of the PVC wood-plastic composite pellet production line usually adopts a specially designed twin-screw or multi-screw structure to adapt to the special properties of wood-plastic composite materials.

Screw structure design: The parameters such as the screw groove, screw ridge and helix angle of the screw are carefully calculated and optimized to ensure that sufficient shear force and mixing effect can be generated during the rotation process. At the same time, the material of the screw is also specially treated to improve its wear resistance and corrosion resistance.
Working principle: During the extrusion process, the screw rotates in the barrel and advances forward. The molten mixed material is fed into the barrel and is sheared, compressed and mixed by the screw. As the screw rotates and advances, the material is gradually heated and softened, and finally forms a viscous flow state. Under the push of the screw, the material in the viscous flow state is continuously and evenly extruded into strips.

Continuous and uniform extrusion requires the synergy of multiple aspects, including the design of the screw, the heating and cooling system of the barrel, and the control system of the extruder.

Screw and barrel coordination: The gap between the screw and the barrel is precisely adjusted to ensure that the material will not leak or clog during the extrusion process. The screw groove and screw ridge design can generate sufficient shear force and mixing effect to make the material reach a uniform state before extrusion.
Heating and cooling system: A heating element is provided in the barrel to heat the material to a molten state. In order to control the extrusion temperature, a cooling system is also provided outside the barrel. By precisely controlling the heating and cooling rate and time, it can be ensured that the material remains in a stable molten state during the extrusion process.
Control system: The control system of the extruder adopts advanced automatic control technology, which can monitor and adjust various parameters in the extrusion process in real time, such as screw speed, heating temperature, cooling rate, etc. By precisely controlling these parameters, the stability and continuity of the extrusion process can be ensured.

Continuous and uniform extrusion has an important impact on the product quality of PVC wood-plastic composite particles. On the one hand, continuous extrusion can ensure the uniformity and consistency of the particles, so that the physical properties and chemical stability of the products are guaranteed. On the other hand, uniform extrusion can also reduce waste and loss in the production process, improve production efficiency and reduce costs.

Particle uniformity: Continuous and uniform extrusion can ensure that the size, shape and weight of each particle remain consistent. This uniformity not only improves the aesthetics of the product, but also makes the product more stable and reliable during subsequent processing and use.
Physical properties: Since the materials are fully mixed and sheared during the extrusion process, the produced particles have excellent physical properties, such as high strength, high toughness, and wear resistance. These properties make the product have broad application prospects in the fields of construction, furniture, packaging, etc.
Chemical stability: Continuous and uniform extrusion can also improve the chemical stability of the particles. During the extrusion process, the additives and additives in the material are fully dispersed and mixed, thereby improving the weather resistance, corrosion resistance and aging resistance of the product.