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There are many production process of aluminum composite sheet. According to the composite process of plastic core panels and two-sided aluminum panels, it can be divided into cold composite method and thermal composite method; it can also be divided into continuous composite method and intermittent composite method.
The production process of aluminum composite sheet is first to clean the aluminum coil. In the production of aluminum coils, due to the needs of the process, the surface is coated with lubricants and anti-oxidants, and some dirt will be attached during transportation, which will affect its adhesion and must be cleaned.
After cleaning and chemical treatment of the aluminum coil, a dense chemical protective film is formed on the surface; this chemical film can improve the oxidation resistance of the aluminum coil and prolong the life of the paint film.
The general process of cleaning is as follows: aluminum coil→spray degreasing→water washing→neutralization→chemical treatment→water washing→drying→cooling→winding.
The cleaned aluminum coil is fed to a coater and coated with a high performance fluorocarbon resin on the outer surface of the aluminum coil.
The process flow is as follows: aluminum coil→feeding→coating fluorocarbon coating→hot air circulation baking paint→cooling→filming→cutting→winding.
The panels of the exterior aluminum composite sheet are coated with two layers of paint and primer. The topcoat of the façade is a highly weather-resistant fluorocarbon resin coating, namely polyvinylidene fluoride (PVDF). Its excellent UV resistance and environmental pollution keep the surface of the protected aluminum coil beautiful.
The surface of the aluminum composite panel can have not only the color of the metal, but also the beautiful marble pattern and color. Fluorocarbon coatings are usually applied to aluminum coils by roll coating and then baked at elevated temperatures to dry them.
The equipment is continuously produced, first primed, then topcoated, and finally coated with a surface varnish. The total thickness of the three-layer paint is 30μm. Each layer of paint needs to be baked at 200 °C for about 60 seconds to dry it.
After the oven is baked, it is quickly cooled by an air cooler. The interior wall paint can be made of epoxy resin, polyester resin and acrylic resin. After the primer, topcoat, and surface varnish are coated, immediately apply a PE protective film on the surface of the coating to avoid scratching the surface coating during subsequent processing, transportation, and installation.
The protective film is self-adhesive and can be removed after installation. The aluminum coil coated with fluorocarbon resin can enter the process of compounding with the plastic core material. The plastic core material is also essentially three layers, with PE plastic in the middle and adhesive on both sides. PE sheets and adhesives can be produced separately or by three-layer coextrusion.
Firstly, the three-layer co-extruded sheet with the structure of adhesive is produced, and then combined with the upper and lower aluminum sheets. The aluminum composite sheet has 0.15mm thick aluminum panel on both sides, and the core layer is 3～5mm, total thickness is 4~6mm. Finally, it is cut into 1220mm×2440mm specifications.
Do you have demand in aluminum composite sheet? Are you interested in our product? Alusign is a professional Chinese aluminum composite sheet manufacturer with 16 years of producing and selling experience. You can send email to: [email protected] to get discount wholesale price and more product information. Of course, you can also leave your message here, and we will contact you soon.
