[China Aluminum Industry Network] 1. Production method of two-color aluminum profiles The so-called two-color aluminum profiles refer to the surfaces of aluminum profiles with the same function and are processed into two colors on different surfaces. There are two main production methods for two-color aluminum penalties: modular and foil so-called modular, which means that aluminum profiles with the same function are composed of more than two sections. First, aluminum profiles are produced separately and then inserted. Assembly, later sawing and other processing methods into a two-color aluminum profile so-called film type, is to process in the same function of the aluminum into two colors, when painting, must be covered with a film to cover part, spray another part in order to obtain Two colors. This article focuses on the production process of paint and film aluminum.
2, the characteristics of two-color aluminum profiles (1) according to different environments, different architectural requirements and different aesthetics, choose a different color.
(2) High product quality requirements, and all processes in the production process must be strictly controlled.
(3) Two-color aluminum profiles, high-grade products, beautiful appearance, favored by consumers.
(4) Two-color aluminum profiles, convenient and flexible production, can be freely combined.
3.1 Production process The production process of two-color aluminum profiles is: degreasing - chromizing - drying - upper row - painting - curing - lower row - inspection - mounting frame - film - the upper row - spray - tear film - curing - down Row-check-packing 3.2 Several issues to be noted in the production process (1) Select a film with a moderate viscosity. In the production of two-color aluminum profiles, the rational choice of film is the key. If the viscosity of the film is too low, it cannot be affixed. The film is easily peeled off and it is quite difficult to spray. The viscosity of the film is too large, which means that the glue on the film is relatively large. When the film is peeled off, the glue on the film can be easily adhered to the section and affect the surface quality of the section. On the other hand, when choosing the film, use glue as much as possible. The composition is consistent with or close to the paint composition, which can reduce the impact on the film color.
(2) Select a film with a proper width and thickness; due to the complex shape of the aluminum profile, the appearance of the aluminum profile is wider and narrower, and it is easier to blow up the flash, reducing the covering ability of the film and affecting the coating quality. If the film is too narrow, it cannot be covered. Obviously it cannot be sprayed. On the other hand, when selecting the thickness of the film, as long as it can cover, there is elasticity, and it is not necessary to choose a film that is too thick, because too thick a film will increase the production cost of aluminum profiles, and it is not necessary.
(3) Apply paint immediately after filming. After the film is coated, the paint should be sprayed in time. The shorter the parking time, the better. If the parking time is too long, the glue on the film is dry and the viscosity is lost. In particular, the wind blows and the film peels off, which makes it difficult to spray. Therefore, in order to ensure the quality of the film and coating, the general parking time after the film should not exceed 16h.
(4) Determine the color, interface, and dividing line. Before the aluminum profiles are sprayed, they must clearly distinguish the color of each surface to be sprayed according to the use function of the profile and the customer's requirements (contract requirements). Which surface is the interface, and which line is the boundary line, in what position: General In other words, the inner side is light-colored, and the outer side is dark. After the requirements for the interface, boundary line, and color have been clarified, it is necessary to take care that the position of the film cannot be misplaced.
(5) Foil quality: Foil is a key process in the processing of two-color aluminum. The quality of the foil directly affects the surface quality of the aluminum profile. It mainly includes the following aspects: First, do not make the film as much as possible during filming. The formation of too much tension, it is sufficient to say that the foil can not be deformed, otherwise sticking the foil is easy to shrink, so that there is no foil on both ends of the aluminum profile; on the other hand, when the two ends of the aluminum foil is disconnected, use The blade cut, but not broken, otherwise, the broken film still shrink; second, the width of the film should be consistent with the width of the veneer, under normal circumstances, the width of the film is slightly larger than the width of the aluminum profile, if the film is too wide , Excessive aluminum edge too much, when spraying, it is easy to be blown by compressed air, if the film is too narrow, can not be completely covered, obviously not enough; Fourth, the veneer boundary line at the edge of the groove, be sure to; The flash edge is pressed into the groove, otherwise, the air flow is easy to be blown when sprayed, which affects the spray quality of the aluminum profile. Fifth, when the film is applied, the film must be flattened to prevent wrinkling, curling, etc. Sixth, for profiles with complex cross-sectional shapes, if a film is difficult to apply, it can be applied in two or more layers to ensure the coverage of the film. Seven is a special section of aluminum profiles with thinner wall thickness or larger cantilever. Film can not be too tight when pressed, we must be careful not to cause deformation of aluminum; eight is by the previous spray, aluminum can not be parked for too long, otherwise it will make the profile table and dust, resulting in difficult film, Affect the film quality:
(6) Strictly carry out the filming process. Aluminium foil must be pasted after the previous coating and not allowed to be applied directly after chrome plating. This is because there is glue on the foil. If the foil is directly attached to the chrome layer, the glue will stick on the chrome layer. Or, when the film is peeled off, the chromium layer will be torn off, which will greatly reduce the adhesion of the paint film, affect the paint quality of the aluminum material, and cause the paint film to fall off, resulting in disastrous consequences.
(7) tear film time. After the aluminum foil is pasted and sprayed, the foil should be torn off, but the foil cannot be torn off immediately after spraying, and the tearing film must be controlled. - In general, after the spray leveling, the paint film is solidified, this process can not be less than 10min. Then tear off the film to tear the film. Otherwise, the paint film is not opened, and the film is easily dropped on the aluminum profile in the process of tearing the film, which affects the quality of the paint film. On the other hand, when the film is torn, it must move quickly so as not to affect the quality of the film.
(8) Spraying sequence Two-color aluminum profiles need to be painted in two colors. There must be dark and light colors in both colors. Spraying must be preceded by spraying. Before spraying, which color should be considered before spraying, which color should be used? Spray, according to the specific circumstances, if the first spray light color, after the spray dark color, the first light-colored coating will go through two curing, that is, two baking, easy to change the light-colored baking, if the first spray Dark color and light color after spraying, then the light color after the spray has a certain influence on the coverage of the front spray dark color, in order to cover the dark color, the thickness of the paint film is increased, but after the paint film is thick to a certain extent, it is easy to produce Release phenomenon. therefore. In actual production, it is more feasible to use a shallower, deeper process.
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