Structure of honeycomb aluminum panels

Thread Content

Honeycomb aluminum panels feature a \"honeycomb sandwich\" structure; they are composite panels made by combining high-strength alloy aluminum sheets as the face and back plates with an aluminum honeycomb core under high temperature and pressure. These panels possess advantages such as light weight, high strength, good stiffness, strong corrosion resistance, and stable performance. Since the air layer between the face panel and the back panel is divided into numerous closed cells by the honeycomb structure, the propagation of heat and sound waves is greatly restricted; compared with other curtain wall decorative materials, honeycomb aluminum panels exhibit excellent thermal insulation properties. Honeycomb aluminum panels are made entirely of aluminum; their surface layer, bottom layer, and core material are all made from high-strength alloy aluminum. They are eco-friendly products that are easy to recycle, and represent the future direction for the development of new building materials. 　　When selecting the raw materials required for the production of honeycomb aluminum panels, the industry standard for the construction sector, JG/T 334-2012 \"Honeycomb Aluminum Composite Panels for Building Externals\", is followed, and the company has established its own specifications for material selection. 　　Aluminum decorative panels: The material used for honeycomb aluminum panel decorative panels is usually aluminum sheets of grades such as 3003 and 5005; sheets of grade 1100, which have a lower alloy content, are less commonly used. The decorative surface is applied by spraying or rolling; the coating used is polyester or fluorocarbon paint. It is preferable to use rolled-coated panels for curtain walls, and at least three coats are required, with a paint thickness of ≥32μm, in order to ensure the durability of the coating. 　　Before painting, the aluminum sheets must undergo rigorous surface anodization to ensure adequate adhesion of the coating as well as strong bonding to the honeycomb core; the coating on the panels shall meet the requirements of standard YS/T429.2-2000. 　　Aluminum back panel: The honeycomb aluminum panel back panel should be made of the same material as the panel itself; its surface should be anodized, and the side exposed to the air should be coated with a protective layer. The coating material can be polyester, epoxy, acrylic, or similar substances, in order to prevent rusting of the aluminum panel due to prolonged exposure to air. 　　Honeycomb core material The honeycomb core material is produced on aluminum honeycomb core production lines using aluminum foil and special honeycomb node adhesive. The factors that affect the performance of aluminum honeycomb cores mainly include parameters such as aluminum foil, joint adhesive, and honeycomb core specifications. 　　Aluminum foil: Aluminum foil of grade 3003 should be used. Strict surface treatment is required during the processing process. For products that demand high strength or durability, honeycomb core aluminum materials manufactured from pure 1100 aluminum foil should be used with caution. 　　Node adhesive: An epoxy-modified high-temperature curing adhesive should be used for node adhesives; it not only provides sufficient bonding strength but also exhibits excellent resistance to environmental conditions as well as to extreme temperatures. Due to their lower strength, common adhesives tend to cause delamination of the honeycomb core, leading to overall structural failure and instability. 　　The node strength of the honeycomb core is the main criterion for evaluating its performance, and its node strength value should be ≥ 2.0 N/mm. 　　(Refer to the Aviation Industry Standard HB5443-90 of the Ministry of Aeronautic Industry of the People’s Republic of China, \"Specifications for Durable Aluminum Honeycomb Core Materials for Sandwich Structures\") Honeycomb core specifications: The specifications for aluminum honeycomb cores are determined by the thickness of the aluminum foil and the size of the honeycomb cells. Different specifications of aluminum honeycombs have varying densities and mechanical properties, and there are also significant differences in their costs. 　　The specifications for honeycomb cores can be expressed in terms of the diameter of the inscribed circle within the honeycomb cells (in imperial units) and the thickness of the aluminum foil/edge length of the cells (in metric units). In China, the **standard specification is based on the thickness of the aluminum foil/edge length of the cells.