【China Aluminum Industry Network】 Aluminium plastic panel is a new type of material that has been surface-treated and coated with an aluminum plate as a surface, and polyethylene and polypropylene plastics have been mixed as a core layer. Since the aluminum-plastic panel is composed of two materials (metal and non-metal) with distinct properties, it not only retains the main characteristics of the original constituent material (metallic aluminum, non-metallic polyethylene plastic), but also overcomes the deficiency of the original constituent material. , And then obtained a number of excellent material properties, such as luxury, colorful and decorative, weathering, corrosion resistance, resistance to hit, fire, moisture, noise, heat insulation, shock resistance; light weight, easy processing and molding, easy to handle Installation and other characteristics, these characteristics open a broad application prospects for aluminum-plastic panels.

The production of aluminum-plastic composite panels is very simple for laymen, but in fact it is a new product with high technical content. Therefore, the quality control of aluminum-plastic panel products has certain technical difficulties. The following mainly discusses the factors affecting the 180° peel strength of aluminum-plastic composite panels.

1, the quality of aluminum foil itself:

Although this is a relatively hidden issue, it has already been reflected in the quality of aluminum-plastic panels. On the one hand, it is the heat treatment process of aluminum materials. On the other hand, some aluminum plates and producers have poor quality control when using recycled aluminum scrap. This requires that producers of aluminum-plastic composite panels conduct various evaluations on material producers, establish qualified subcontractors and establish business contacts to ensure the quality of materials.

2, aluminum plate pre-treatment issues:

The cleaning of the aluminum plate and the quality of the layer directly relate to the composite quality of the aluminum plate. The aluminum plate must first be cleaned to remove oil impurities on the surface, so that a dense chemical layer is formed on the surface, so that the polymer film can be well bonded. However, some manufacturers do not strictly control the temperature, concentration, treatment time, and renewal of the treatment liquid in the pretreatment process, which affects the cleaning quality.

What's more, individual new manufacturers use aluminum plates without any pretreatment. All of these will inevitably result in poor composite quality, low or 180° peel strength, or instability.

3, the selection of core materials:

Because the adhesion of polymer film and PE is better than other plastics and the price is moderate, non-toxic and easy to process. Therefore, PE is used as the core material. Some small manufacturers use PVC that has poor bonding and burns fatal gas in order to reduce costs, or use PE recycled materials or use PE materials mixed with the lower corners. This will lead to different composite temperatures due to different types of PE, aging, etc., and the composite surface quality is unstable compared to the final surface.

4, the selection of polymer membranes:

Polymer film is a kind of adhesive material with special properties, which affects the main factors of the composite quality. The polymer membrane has two sides and three layers are co-extruded. One side is bonded with metal, the other side is bonded with PE, and the middle layer is a PE substrate. The properties of both sides are completely different. The material prices on the two sides differ widely. The materials needed to shop with aluminum plates need to be imported and expensive.

However, the material that is blended with PE can be produced domestically. Therefore, some polymer film manufacturers have made a fuss about this, and a large number of PE fusion materials have been used to cut corners to cut profits. The use of polymer membranes has directionality, and the front and back cannot be reversed. The polymer membrane is a self-solving membrane and incomplete melting can lead to pseudo-composite. Early strength is higher and time is longer, and the effect of weathering will reduce the strength and even bubbling or opening the plastic.

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