Metal profiles are widely used in various aspects of buildings due to their excellent durability, decorative properties, and processability. Aluminum profiles, however, account for more than 80% of metal profiles due to their excellent processability and light weight. The application of powder coatings in aluminum profiles has been growing rapidly. At present, the surface treatment of aluminum profiles exists roughly anodic oxidation, and powder coating three treatment methods, each of which has its own advantages and occupies a considerable market share. In the coating of aluminum profiles, representative powder coating varieties are outdoor type, indoor type, anti-corrosion powder coating, etc.; as the application, such as part of the aluminum frame, balcony, corridor, partition panels, such as high nature of the aluminum profile, most of the polyester outdoor powder coating, in addition, due to the excellent adhesion of the powder coating, anti-corrosion, but the weather resistance is poor, it is partially used for the indoor type of primer.
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Features of powder coating for aluminum profiles
(1) The processing technology is relatively simple. Some of the main technical parameters have been able to achieve micro-control, effectively reducing the difficulty of the process operation, while auxiliary equipment is greatly reduced. Such as: ventilation facilities, heating, freezing devices
(2) of water, the atmosphere to reduce the degree of pollution, alkali, sulfuric acid and other liquid organic solvents are no longer used to reduce water and atmospheric pollution, but also effectively improve the aluminum profile and as an environmentally friendly product of the competitive strength of plastic steel profiles, and accordingly reduce some of the production costs
(3) on the surface quality of the gross material requires a significant reduction in standards, powder coating and can completely cover the profile surface extrusion pattern, cover part of the aluminum profile surface defects, improve the surface quality of the finished aluminum profile; when the profile with powder coating and then combined with the technology, so that it is more with a more fashionable trend, so that powder coating profiles have a greater space for development.
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Preparation of powder coated profiles prior to the production process
(1)The fixture is divided into two kinds from the overall point of view, one is the fixture placed at the ends of the profile, and the other is the fixture placed in the middle part of the profile, and there is a significant difference between the two in terms of application. Both ends of the fixture should ensure that it can withstand the pressure of a considerable weight, because in the way the material is used in a way similar to a series of connection, by the profile weight and hanging and profile contact area is small, so that hanging must maintain a considerable weight-bearing capacity; intermediate parts of the use of fixtures in the production and use of the process should be guided by a basic principle, that is, to minimize the fixtures and the profile’s external surface (i.e., face) The size of the contact point, the contact point hinders the adsorption of powder on the surface of the profile, forming some small defects
(2) The larger the contact point, the larger the area of defects, so the contact area of the fixture profile should be minimized, in addition to the middle part of the fixture in the design of a vertically placed hanging rod, adsorbed some powder in the production process, hindering the adsorption of powder in the back of the profile, so should be timely on these parts to make up for the powder. The hanging position in the hanging tool of the profile should also follow the corresponding principles, including the complex side as far as possible in the horizontal position, the horizontal left and right sides are the most easy to adsorb the powder. And the most complex side as far as possible in the same direction, this time to the side of the powder and compressed air pressure can be appropriately increased, and the direction of the powder spray and groove in parallel position, the strength of the powder is easy to adsorption
(3)In order to improve the production efficiency and reduce the energy consumption in the drying process, the pre-treatment process mostly adopts a relatively large material rack, as much as possible to load the profiles to be treated, the gap between the profiles and the degree of sparseness is the first thing to consider in the pre-treatment process. For some softer profiles, more in the middle of the profile should be placed in the center of the cross-arm, and let the groove part down as far as possible, so as to facilitate the evaporation of water. When the drying process is completed, there is still water residue, in order to avoid destroying the chitinized film on the surface of the profile, and the profile is easy to produce deformation when the temperature is too high, it should not be put into the oven to bake again, and it can be used to cool dry or blow-drying with an air gun. In addition, the profile in and out of the groove and in the drip-drying process, must maintain an appropriate angle of inclination, but easy to cause part of the profile slipping, should be used in the material frame at one end of the head part of the bundle of thousands of pieces of steel wire mesh as a precautionary measure.
Summarize
At this stage, many processes in the production of aluminum powder coating there are many areas for improvement, requiring manufacturers to continue to transform the existing process in order to improve the level of surface treatment of domestic aluminum profiles, to promote the development of aluminum profile industry to newer, deeper and higher direction to meet the requirements of consumers a higher standard of living.
