Analysis of Peeling of Aluminum Composite Panel



The aluminum composite panel is a new type of material which has been surface-treated and coated on aluminum plate as surface. Polyethylene and polypropylene plastic are mixed as a core layer and processed through a series of processes.

Since the aluminium composite panel is composed of two materials (metal and non-metal) with distinct properties, it retains the main characteristics of the original constituent materials (metal aluminum, non-metal polyethylene plastic) and overcomes the shortcomings of the original constituent materials.

In addition, it has obtained many excellent material properties, such as luxury, colorful decoration, weather resistance, corrosion resistance, impact resistance, fire prevention, moisture resistance, sound insulation, heat insulation, shock resistance; light weight, easy processing and easy handling features such as installation, these features open up a broad application prospect for acp panel panels.

The production of aluminum composite panels is very simple for laymen, but in fact it is a new product with high technical content, so there is a certain technology difficulty in the quality control of reynobond panels. The following mainly talk about the factors affecting the 180° peel strength of plastic composite sheets.

The quality of the aluminum foil itself

Although this is a relatively hidden problem, it has been reflected in the quality of acm metal panels. On the one hand, there is a problem of heat treatment of aluminum, and on the other hand, some aluminum sheets and producers have poor quality control when using recycled aluminum. This requires the producers of composite metal panels to evaluate all aspects of the material producers and determine the qualified sub-contractors to establish business contacts to ensure material quality.

Pretreatment problems of aluminum plates

acp sheet

The cleaning of the aluminum composite sheet and the quality of the layer are directly related to the composite quality of the aluminum composite sheet. The aluminum plate is first cleaned to remove surface oil impurities, etc., so that a dense chemical layer is formed on the surface to facilitate good bonding of the polymer film.

However, some manufacturers do not control the temperature, concentration, treatment time, and processing liquid update of the treatment liquid in the pre-treatment process, which affects the cleaning quality. What’s more, some new manufacturers use aluminum without any pre-treatment. All of this will inevitably result in poor composite quality, low 180° peel strength or instability.

The selection of core materials

Because the bond between polymer film and PE is the best and cheaper than other plastics, it is non-toxic and easy to process. Therefore, PE is chosen as the core material. In order to reduce the cost, some small aluminium composite panel manufacturers use PVC with poor bonding effect and fatal gas when burning, or use PE recycled materials or PE raw materials mixed with the scraps. Different composite temperature due to the difference in the type and age of the PE, the final performance is unstable in composite quality.

Selection of polymer membranes

Polymer film is a kind of bonding material with special properties, which affects the main factors of composite quality. The polymer film has two sides and is coextruded in three layers. One side is bonded to the metal, the other side is bonded to PE, and the middle layer is a PE substrate, and the properties on both sides are completely different.

The prices of the materials on both sides are very different. The use of polymer membranes is directional, and the front and back sides cannot be replaced. The polymer film is a self-solving film, and incomplete melting leads to pseudo-composite. In the early stage, the strength is high. Due to the influence of weathering, the strength is lowered, and even the phenomenon of bubbling or opening of glue is caused over time.

Contact us

Alusign is a Chinese aluminum composite panel supplier and exporter of diabond panels with 16 years of experience. We have a professional, strict manufacturing team and quality inspection team. The acm materials sold by Alusign are strictly controlled, and the quality of the products is enough for customers to trust.

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