Co-extrusion technology is an advanced technology that can significantly improve the yield and product performance in the plastic extrusion process.
Co-extrusion technology refers to the convergence of two or more kinds of plastic materials at the head of the same extruder, and extrusion molding through a common mold to form a multi-layer structure of plastic products.
How it works:
Different plastic materials are transported to the co-extrusion head through their own independent extrusion systems. Inside the head, these materials are distributed according to a predetermined layer structure and then extruded together to form the final product.
Advantages:
1. Increase production:
Multiple layers of material can be extruded at the same time, which is equivalent to completing multiple separate extrusion processes in a single operation, thus greatly improving production efficiency.
The time of changing materials and molds on the production line is reduced, and the effective running time of the equipment is increased.
2. Improve product performance:
Different layers of materials can have different performance characteristics, such as the outer layer has good weather resistance and wear resistance, and the inner layer has excellent strength or barrier properties.
By combining materials at different prices, costs can be reduced without sacrificing performance.
3.High flexibility:
According to the needs of the product, the type, thickness and proportion of each layer of material can be adjusted at any time.
Type:
1. Two-color co-extrusion: usually used to produce products with two different colors or appearance effects.
2. Multi-layer co-extrusion: Common co-extrusion with three layers, five layers or even more layers is used to achieve more complex performance requirements.
Application field:
1. Plastic pipe: such as composite pipe with anti-corrosion layer and reinforced layer.
2. Plastic film: such as multi-layer packaging film with preservation and barrier properties.
3. Profile: such as plastic door and window profiles with decorative layers and structural layers.
Key technologies and challenges:
1. Head design: It is necessary to ensure that different materials can be uniformly confluent in the head to avoid cross-flow between layers and interface instability.
2. Material compatibility: There needs to be a certain degree of compatibility between the layers of materials to ensure a good combination between the middle layer during extrusion and use.
3. Process control: accurately control the temperature, pressure and flow of each extrusion system to obtain stable layer structure and product quality.
In short, co-extrusion technology for the plastic extrusion industry provides an efficient, flexible and can improve product performance and added value of the method, to improve the output of extruders and product competitiveness is of great significance.
