Aluminium composite panel is a new type of material that is processed and compounded by a series of processes by using surface-treated and coated aluminum coil as the surface, polyethylene and polypropylene as the core layer.
Since the aluminum composite panel is composed of two materials (metal and non-metal) with completely different properties, it not only retains the main characteristics of the original component materials (metal aluminum, non-metal polyethylene plastic), but also overcomes the shortcomings of the original component materials , And obtained many excellent material properties, such as luxury, colorful decoration, weather resistance, corrosion resistance, impact resistance, fire resistance, moisture resistance, sound insulation, heat insulation, and earthquake resistance; light weight, easy processing and forming, easy transportation and installation These characteristics have opened up a broad application prospect for aluminum composite panels. The production of Aluminium composite panel panels is very simple in the eyes of laymen, but in fact it is a new product with high technical content, so the quality control of Aluminium composite panel panels has certain technical difficulties.
The following mainly talks about the factors that affect the 180° peel strength of the Aluminium composite panel.
1. The quality of aluminum coil itself:
One aspect is the heat treatment process of aluminum, on the other hand, some aluminum plates and producers do not have strict quality control when using recycled aluminum scrap.
2. Pre-treatment of aluminum coil:
The cleaning and layering quality of aluminum coils are directly related to the composite quality of aluminum composite panels. The aluminum coil must first be cleaned to remove the surface oil and impurities, so that a dense chemical layer is formed on the surface, so that the polymer film can produce a good bond. However, some manufacturers do not strictly control the temperature, concentration, treatment time, and renewal of the treatment liquid during the pretreatment process, which affects the cleaning quality. Even the aluminum plate is used directly without any pretreatment, which will inevitably lead to poor composite quality, low 180° peel strength or instability.
3. Selection of core material:
Because the bonding between polymer film and PE is the best compared with other plastics, the price is moderate, non-toxic, and easy to process. So the core material is PE. In order to reduce costs, some small manufacturers choose PVC, which has poor bonding effect and produces deadly poisonous gas when burned, or choose PE recycled materials or choose PE raw materials to be mixed with lower corner materials. This will result in different composite temperatures due to different types of PE, aging degree, etc., and the final surface will be unstable in composite quality.
4. Selection of polymer membrane:
Polymer membrane is a kind of bonding material with special properties, it is the main factor affecting the composite quality. The polymer film has two sides and is co-extruded with three layers. One side is bonded to metal, the other side is bonded to PE, the middle layer is PE substrate, and the properties of the two sides are completely different. Inferior polymer membranes are self-dissolving membranes, and incomplete melting will lead to false composites. The early strength is high and the time is long, the strength will be reduced due to the influence of weathering, and even bubbling or cracking.
