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Analysis of quality problems in the process of aluminum-plastic composite
- Oct 22, 2018 -

Board bubbling

The surface of the aluminum-plastic board is bubbled with a granular infusible material. When the average diameter of these infusates is large to a certain extent, it will protrude on the surface of the core board. Bubbling phenomenon. When we peeled off the aluminum plate, we found that there were signs of poor adhesion around the bubble. The reason for this sign was that when the bubble was recombined, the air around the bubble could not be completely squeezed. In the middle of the slab, an extremely thin layer of air blocks the adhesion of the slab. These infusibles may be other impurities mixed in the plastic particles, or may be mixed with other plastic particles. The melting point of these plastics is much higher than that of polyethylene, which cannot be melted in the barrel and is blocked on the side of the stainless steel mesh sheet. When it is concentrated to a certain extent, the extrusion back pressure is increased, so that the filter is squeezed together to cause the core plate to bubble. If the particle size of the non-melting material is too large, it may be stuck in the die, so that the surface of the extruded core plate forms a deep impression, which may also cause quality problems of the plate surface.

For the production of thin plastic sheet, it is necessary to use a certain number of stainless steel wire mesh for filtration. For aluminum plastic core board, it can be used to filter through a hole with a certain aperture smaller than the thickness of the board. Solve the bubbling problem.

Plate surface trap

The surface of the aluminum-plastic panel has a collapse of the size of the thumbprint, which is caused by the stiffness of the polymer film. The rigidity of the polymer film is not equal. Generally, the size of the rice grain is white, which is a problem of the quality of the rubber layer. When these protruding granules are compounded, the air around them cannot be completely extruded as in the above-mentioned bubbling phenomenon, and is wrapped in the plate. When the heat is melted, the bond can be bonded to the slab, but there is an air layer barrier. The place is doubled and directly affected, forming a trap. The quality of this material needs to be eliminated from the procurement of materials and production management.

Ruffle

The ruffled edge is the wave at the edge of the board. This is a common problem, mainly caused by the waves on the edge of the aluminum coil. The aluminum coil wave is a problem of rolling quality, and the severe wave deformation cannot be completely solved even after the drawing, bending and correction of the finishing process. In addition, in the baking varnish, the aluminum coil heats up too fast. If the temperature of the oven plate rises to a very high temperature immediately, the aluminum plate will expand rapidly, which forms a great contrast with the unheated aluminum plate in the boundary zone, which will definitely lead to the surface of the plate. The thermal deformation causes the ruffles.

It is difficult to absolutely flatten the surface of the aluminum coil processing, and it can be used without affecting the flatness of the aluminum composite panel within the technical requirements. In production practice, sometimes the aluminum coil does not appear to have significant flounces, but the ruffles are produced during the compounding process. The occurrence of the ruffle on one side of the aluminum coil is severely deformed, and for very severe deformation, although the ruffle is not caused, a side relaxation phenomenon is formed. The tension control brake device of the unwinding machine on the composite production line is generally installed on one side thereof. Since the core of the aluminum coil is not very rigid, even the coils which are flat on both sides are spread out on the other side. The aluminum plate also has a slight slack. If the aluminum coil which is slightly slack on one side is just loosened and installed on the side without the brake, it may cause the ruffle, and vice versa. To solve this accidental phenomenon, it is an effective method to install the brake device on both sides of the unwinder.

In short, the formation of the ruffle is mainly a problem of aluminum coil, and the aluminum coil which is severely deformed can only be disposed of, but the deformation can be eliminated by increasing the tension for less severe deformation. Some composite lines have two traction machines. In this case, pay special attention to the speed ratio relationship between the two traction machines, that is, adjust the tension of the plate surface, and the small will also cause the ruffle.

Poor adhesion

Poor adhesion or even degumming is a very worrying issue in the production of aluminum composite panels. There are many factors causing this problem, both on the equipment and in the operation, the cold shrinkage deformation of the core sheet and the deformation of the aluminum coil, and the contamination of the aluminum surface by the smoke in the paint can cause poor adhesion. When the plastic contains low molecular chemical additives such as an opening agent and a slip agent, the adhesion of the rubber layer is also slowly damaged, and degumming occurs. Therefore, for the phenomenon of poor adhesion, we need to analyze the specific problems and find out the crux.

Through the analysis of some common quality problems encountered during the processing and assembly of aluminum-plastic composite panels (composite aluminum panels), the measures and methods for solving them are proposed, which will surely enable the constructors to process the aluminum-plastic composite panels when processing aluminum-plastic composite panels. Common quality problems can be prevented and controlled. The aluminum-plastic composite board is a composite material which is processed on a special aluminum-plastic board production equipment by using a chemically-coated aluminum plate as a surface material and a polyethylene plastic as a core material. The unique properties of the aluminum-plastic composite panel determine its wide range of uses: it can be used for building exterior walls, curtain wall panels, renovation of old buildings, interior wall and ceiling decoration, advertising signs, display stands, purification and dust prevention. engineering. Aluminum-plastic composite panels have been widely used in China and belong to a new type of architectural decoration materials.