Composite metal plate process

Abstract

The invention belongs to the technical field of decorative building materials, and in particular relates to a composite metal plate process. The process comprises the following steps: (1) preparing a plastic core material; (2) performing coextrusion molding on the plastic core material and metal belts, namely respectively bonding adhesive films on the inner sides of the upper metal belt and the lower metal belt, melting the adhesive films by using excess heat during the extrusion of the plastic core material and performing the coextrusion bonding on the plastic core material with the upper metal belt and the lower metal belt to form an integrated structure so as to obtain a composite metal plate; (3) bonding a protective film on the composite metal plate; (4) cooling; (5) levelling; (6) trimming; and (7) discharging. According to the process, the traditional high-temperature compounding is converted into the low-temperature compounding; the compounding is performed by using the excess heat after the extrusion of the plastic core material, so that a coefficient of the swelling deformation of the metal material during the heating is greatly decreased while the composite temperature is increased by 20 DEG C and the composite strength of the composite metal plate can be improved by more than 30%. The energy saving effect of the process is obvious, so that the energy consumption of a compounding machine is greatly decreased, wherein the energy can be saved by more than 50%. As a result, the complexity of the process and the waste of the materials are reduced; and the phenomenon that the metal surface is damaged due to a high temperature is avoided.

Description

technical field [0001] The invention belongs to the technical field of decorative building materials, in particular to a metal composite board process. Background technique [0002] The traditional aluminum-plastic composite panel is made of double-layer 0.5mm aluminum plate and 3mm polyethylene rubber plate, which is used to replace the 3mm pure aluminum plate, so as to reduce the use of 2 / 3 of the aluminum material, and does not It affects the use effect, reduces material cost and waste of resources, and reduces environmental pollution. [0003] ZL97116494.0 discloses a composite method of aluminum-plastic board and its composite device. In this technology, the preparation of the plastic board (that is, the plastic core material) is self-contained. First, the plastic board is prepared, and then the surface of the plastic board is covered. There are polymer film (that is, adhesive film) and aluminum foil (that is, aluminum strip) for bonding, and the polymer film is melted...

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Problems solved by technology

[0003] ZL97116494.0 discloses a composite method of aluminum-plastic board and its composite device. In this technology, the preparation of the plastic board (that is, the plastic core material) is self-contained. First, the plastic board is prepared, and then the surface of the plastic board is covered. There are polymer film (that is, adhesive film) and aluminum foil (that is, aluminum strip) for bonding, and the polymer film is melted by a composite device, so that the aluminum foil and the plastic plate are bonded together, and the composite plate after thermal compression bonding The composite device is used for pressure setting and cooling. This technology has the following disadvantages: ①The composite device needs to be integrated with a heating composite roller, and the composite roller (needs to be controlled at 250-350 degrees Celsius) melts the polymer film through aluminum foil (melting temperature 115-125 Celsius), resulting in a high thermal expansion coefficient of aluminum foil; ② more steps, complex processing; ③ higher energy consumption; ④ this technology is limited to the production of aluminum-plastic composite panels, not suitable for the side of the plastic core material Composite aluminum strip, composite copper strip or galvanized steel strip or stainless steel strip or titanium-zinc strip on the other side, also not suitable for composite flocked metal strip with velvet

[0004] If it is necessary to melt the polymer film through the composite roller through the copper plate, stainless steel plate and titanium-zinc plate, the temperature of the composite roller must be greatly increased, because the thermal conductivity and thermal expansion coefficient of the aluminum plate, copper plate, stainless steel plate and titanium-zinc plate are very different. For example, the thermal expansion coefficients of aluminum and copper differ by 0.7 times, and the thermal expansion coefficients of aluminum and stainless steel differ by 1 time. Therefore, the higher the composite temperature, the greater the thermal expansion of the material, and the greater the deformation after cooling. This technology cannot be realized in plastic plates. Metal strips of different materials are composited on both sides of the metal composite board, which cannot guarantee the flatness of the metal composite board. At the same time, the temperature difference required by materials of different thicknesses is too far, which brings great difficulties to the selection of equipment and the adjustment of temperature in the process. difficulty

[0005] Excessive temperature of the composite roller will cause strong damage to the color and coloring effect of the metal strip surface. The temperature resistance of the flocking board is only 180 degrees Celsius, and 250-350 degrees Celsius does not meet the technical requirements of the flocking metal strip at all. Therefore, This composite process is not suitable for metal strips with general thermal conductivity and flocked metal strips with low temperature resistance

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