In the multi-layer co-extrusion process of the seven-layer co-extruded high-barrier film, how to ensure good adhesion and uniform distribution between the layers of materials?
Changxi Packaging Technology is well aware that the quality of raw materials is the key to determining the performance of multi-layer co-extruded films. The company strictly implements the screening and audit procedures for raw material suppliers and only cooperates with suppliers that have been strictly evaluated, have a good reputation and strong technical strength. The raw materials provided by these suppliers not only meet the basic physical and chemical performance requirements, but also need to have good processing adaptability and interlayer adhesion.
After the raw materials enter the factory, the company implements strict incoming material testing and incoming material comparison to ensure that the key indicators such as the composition, particle size, and melt index of each batch of raw materials meet the established standards. Through advanced testing equipment such as Fourier transform infrared spectrometer (FTIR), differential scanning calorimeter (DSC), etc., the raw materials are accurately analyzed to further select the most suitable raw material combination for multi-layer co-extrusion.
Changxi Packaging Technology uses advanced co-extrusion technology and precise extrusion control system in the production of seven-layer co-extruded high-barrier films. Multi-layer co-extrusion technology involves extruding resin raw materials with different properties through multiple extruders at the same time, and compounding them into one through specially designed molds in a molten state. This process requires extremely high precision and coordination.
Mold design: The seven-layer co-extrusion mold independently developed by the company adopts a precise flow channel design to ensure the uniform distribution and precise control of each layer of materials in the mold. The flow channel design of the mold has been simulated and optimized many times to reduce the shear stress and temperature gradient of the material during the flow process, and ensure the uniformity and stability of each layer of materials.
Extruder temperature control: The heating system and temperature control system of each extruder are automated and intelligent, and can automatically adjust the heating power and temperature distribution according to different raw material characteristics and extrusion speeds to ensure that each layer of materials maintains the best molten state during the extrusion process, which is conducive to interlayer bonding.
Interlayer bonding promoter: Adding an appropriate amount of bonding promoter, such as maleic anhydride grafted polyethylene (MAH-g-PE), between specific layers can effectively improve the bonding strength of the interlayer interface, ensure that each layer of materials is tightly combined and not easy to delaminate.
Changxi Packaging Technology's production process design and process control system ensure the stability and traceability of each batch of products. During the multi-layer co-extrusion process, the company introduced online monitoring systems, such as thickness monitors, width monitors and online quality defect detection systems, to monitor the thickness, width and surface defects of the film in real time. Once an abnormality is found, the process parameters are adjusted immediately to ensure product quality.
Each batch of products is strictly tested and quality controlled in accordance with the supplier's indicators, including but not limited to key performance indicators such as tensile strength, elongation at break, barrier properties (oxygen permeability, water vapor permeability), and heat seal strength. The company has also established a complete quality management system, such as ISO 9001 and HACCP, to ensure that every link from raw materials to finished products meets international standards and customer requirements.
The company has sufficient production capacity and has multiple highly automated production lines that can respond quickly to market demand. Through a complete ERP system, the full chain of information management from raw material procurement, production planning, inventory management to sales and delivery has been realized, which has improved production efficiency and supply chain transparency.
In terms of raw material supply, the company has established a long-term and stable cooperative relationship with major suppliers to ensure the stability and timeliness of raw material supply, providing a solid foundation for continuous production.
Changxi Packaging Technology adheres to the concept of seamless service and has an after-sales service team composed of technical backbones. They not only have rich knowledge of multi-layer co-extrusion technology, but also can provide 24-hour tracking services, visit customers in time, collect feedback, and help customers solve practical problems in production.
The company has established a regular communication and consultation mechanism and customer file system with customers, and continuously improves customers' technical level and product application capabilities through regular technical exchanges and training. In response to customers' special needs, the company provides customized solutions to ensure that product performance is perfectly matched with customer application scenarios.
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