How is multi-layer co extrusion achieved in a cast film production line
DATE：2024/8/22 14:49:21 / READ： / SOURCE：This station
The multi-layer co extrusion technology of the cast film production line is an important innovation in the field of modern plastic processing. This technology not only improves the physical properties of the film, but also integrates various film characteristics such as barrier properties, heat resistance, and flexibility. Below, we will briefly introduce the multi-layer co extrusion technology of the cast film production line.
1. Basic principles of co extrusion technology
The core of multi-layer co extrusion technology is to use different materials to extrude through a mold at the same time, forming multi-layer films. Through this method, different layers can be formed in the film, each layer can use different resin materials to meet specific performance requirements. For example, the outer layer can use resin with excellent wear resistance, while the inner layer can use resin with high barrier properties.
2. Composition of the Cast Film Production Line
The cast film production line mainly consists of the following parts:
Extruder: Multi layer cast film production lines are usually equipped with multiple extruders for different raw materials. The number and type of different extruders depend on the number of layers and required performance of the final product.
Co extrusion mold: During the extrusion process, multiple extruded molten resins are combined together through a co extrusion mold to form a thin film structure. Mold design is crucial as it requires precise control of the thickness and distribution of each layer of material.
Cooling device: The cast film needs to be rapidly cooled after formation to maintain its shape and properties. Usually, water or air cooling is used for cooling.
Roll up device: After cooling, the film is shaped and finally wound into a roll for subsequent storage and transportation.
3. Control technology
In the multi-layer co extrusion process, precise control of multiple parameters such as temperature, pressure, flow rate, and cooling rate is required. Therefore, the more co extrusion layers to be achieved, the higher the automation and accuracy requirements for the control system of the production line.
4. Application advantages
The advantage of multi-layer co extruded cast film lies in its ability to combine the properties of different materials, providing better physical and chemical properties. Currently, films produced by multi-layer co extrusion technology are often used in fields such as food packaging, medical equipment, electronic products, and building materials. The use of these films can effectively extend the shelf life of products and improve their overall performance.
The core of multi-layer co extrusion technology is to use different materials to extrude through a mold at the same time, forming multi-layer films. Through this method, different layers can be formed in the film, each layer can use different resin materials to meet specific performance requirements. For example, the outer layer can use resin with excellent wear resistance, while the inner layer can use resin with high barrier properties.
The cast film production line mainly consists of the following parts:
Extruder: Multi layer cast film production lines are usually equipped with multiple extruders for different raw materials. The number and type of different extruders depend on the number of layers and required performance of the final product.
Co extrusion mold: During the extrusion process, multiple extruded molten resins are combined together through a co extrusion mold to form a thin film structure. Mold design is crucial as it requires precise control of the thickness and distribution of each layer of material.
Cooling device: The cast film needs to be rapidly cooled after formation to maintain its shape and properties. Usually, water or air cooling is used for cooling.
Roll up device: After cooling, the film is shaped and finally wound into a roll for subsequent storage and transportation.
In the multi-layer co extrusion process, precise control of multiple parameters such as temperature, pressure, flow rate, and cooling rate is required. Therefore, the more co extrusion layers to be achieved, the higher the automation and accuracy requirements for the control system of the production line.
4. Application advantages
The advantage of multi-layer co extruded cast film lies in its ability to combine the properties of different materials, providing better physical and chemical properties. Currently, films produced by multi-layer co extrusion technology are often used in fields such as food packaging, medical equipment, electronic products, and building materials. The use of these films can effectively extend the shelf life of products and improve their overall performance.
Author：admin