To maintain the durability and anti-aging performance of aluminum co-extruded profiles in long-term use, it is necessary to take a series of measures in technical research and development and quality control. In this regard, Liaoning Muhan mainly adopts the following technical means and quality control to ensure the durability of the products in complex environments:

Technical Measures

- Optimization of material formulation

    - Selection of high-quality base materials: Liaoning Muhan strictly selects high-purity aluminum alloy and high-performance plastics as the base materials in the production of aluminum-plastic co-extruded profiles. High-purity aluminum alloy has better strength and corrosion resistance, while high-performance plastics have good toughness, weatherability and anti-aging properties, laying the foundation for the durability of the profiles.

    - Adding functional additives: In the plastic formula, add appropriate amount of UV absorbers, antioxidants, heat stabilizers and other functional additives. Ultraviolet absorber can effectively absorb the ultraviolet rays of the sun, preventing the plastic from degradation and aging due to ultraviolet radiation; antioxidant can inhibit the oxidation reaction of the plastic in the long-term use of the process, to extend its service life; heat stabilizers can improve the thermal stability of the plastic in the processing and use of the process, to prevent the performance of the decline due to temperature changes.

- Improvement of production process

    - Optimization of co-extrusion process: Advanced co-extrusion process is adopted to achieve close bonding between aluminum alloy and plastic layer, forming a solid interface. Through precise control of temperature, pressure and extrusion speed and other parameters in the co-extrusion process, to ensure that the two materials can be uniformly and stably fused together, to avoid the phenomenon of delamination or poor bonding, so as to improve the overall structural strength and durability of the profile.

    - Surface treatment technology: the surface of aluminum-plastic co-extruded profiles for special treatment, such as the use of fluorocarbon spraying or powder coating process. These surface treatment methods can form a layer of hard, wear-resistant, corrosion-resistant protective film on the surface of the profile, which can effectively isolate the erosion of the profile by moisture, oxygen, acid and alkali and other harmful substances in the external environment, and at the same time improve the gloss and decorativeness of the profile, so as to maintain its good appearance in long-term use.

Quality Control

- Raw material quality inspection

    - Strict Supplier Selection: Liaoning Muhan has set up a strict supplier selection system, only choosing raw material suppliers with good reputation and quality assurance. Before purchasing raw materials, we will evaluate and audit the production capacity, quality control system and product quality of the suppliers to ensure that the purchased raw materials meet the company's quality standards.

    - Factory inspection system: When the raw materials are imported into the factory, strict inspection will be carried out. For aluminum alloy materials, its chemical composition, mechanical properties, dimensional accuracy and other indicators will be tested; for plastic raw materials, its melt index, density, tensile strength and other performance parameters will be checked. Only qualified raw materials can be put into production to ensure the quality of products from the source.

- Production process quality control

    - Online inspection and monitoring: In the production process, advanced online inspection equipment and monitoring system are adopted to monitor the production process of profiles in real time. For example, the wall thickness of profiles is measured online by laser thickness gauge to ensure that the wall thickness of profiles is uniform and meets the standard requirements; the quality control system is utilized for real-time monitoring and adjustment of temperature, pressure and other parameters in the process of co-extrusion to ensure the stability of the production process and the consistency of product quality.

    - Setting of quality inspection points: multiple quality inspection points are set up in the production line to conduct regular sampling inspection of profiles. The inspection includes the appearance quality of the profiles (e.g. whether there are bubbles, scratches, deformation, etc.), dimensional accuracy (e.g. length, width, angle, etc.), physical properties (e.g. hardness, toughness, impact resistance, etc.), as well as the bonding strength of the aluminum alloy and the plastic layer. Once quality problems are found, timely adjustments and improvements are made to avoid unqualified products flowing into the next process.

- Finished product quality inspection and certification

    - Strict finished product inspection: After the production of products is completed, a comprehensive finished product inspection will be carried out. In accordance with national standards and internal standards, the profiles are strictly tested for various performances, including durability test, anti-aging test, sealing performance test, sound insulation performance test and so on. Only products with all performance indexes meeting the requirements can be judged as qualified products and allowed to leave the factory.

    - Third-party certification: actively seek third-party certification of authoritative organizations, such as ISO quality management system certification, door and window profiles related industry certification. Through the third-party certification, not only can prove that the products meet the requirements of the relevant standards and norms, but also improve the market recognition and competitiveness of the products, so that customers can feel more confident in using Liaoning Muhan's aluminum co-extruded profile products.