EnglishViews: 345 Author: Julong Publish Time: 2023-12-08 Origin: aluminum panel systems manufacturer
Coating is a critical step in the production of aluminum sheets and coils. The decorative effect of a coated product is directly affected by its quality, particularly its apparent quality. To produce high-quality coated aluminum coils, we must first understand the common defects and causes in the coating process. There are numerous causes for the formation of a defect, but the following five are common:
The coating line necessitates that the coating equipment be in good working order. The coating equipment must operate without horizontal or vertical vibrations. Coating rollers should be finely ground. The lateral runout of all rollers on the coating machine must be kept within the allowable range; otherwise, the surface quality of the coating will suffer.
Coatings and aluminum coils are two factors that can impact coating quality during the coating process. The coating rate is low due to color differences between batches of coatings, insufficient fineness of coatings, poor coordination between coatings and solvents, layering, and so on. It will have a direct impact on the coating effect and cause defects. Unevenness in the aluminum coil substrate, uneven film thickness, and poor edge deflection will all have a direct impact on product quality and overall use. As a result, quality should be strictly controlled when aluminum coil raw materials enter the factory for inspection. Click here for Color Coated Aluminum Coil.
To ensure that the quality of the painted surface is not polluted, the interior of the painting room must be clean, dust-proof, insect-proof, and have a certain ventilation performance. At the same time, temperature changes cause the process conditions to change over time.
The operator's sense of responsibility, technological proficiency, and operational standardization are the keys to achieving high-quality coating effects. To ensure high-quality coating products, it is necessary to strengthen operator training and allow operators to master the principles and key points of coating technology, strengthen responsibility, and strictly adhere to operating procedures.
The coating process is closely related to coating quality, and it is necessary to maintain a certain range of relative line speed ratios for the coating roller, paint extraction roller, metering roller, and substrate. A specific viscosity range should be set for the coating based on different systems and the film thickness of the coating product to ensure smooth coating progress and promote product quality improvement. The coating curing process and oven control must be controlled according to the requirements and must not be changed arbitrarily; otherwise, the color difference and performance of the coated product will be severely impacted.
The factors listed above are interconnected and influence one another. When the occurrence of a defect is caused by a combination of factors, specific problems must be thoroughly investigated and eliminated one by one.
As coated aluminum coils become more prevalent in our lives, everyone's expectations for the quality of coated aluminum coils rise. What type of coated aluminum coil will entice more customers? Then we must focus our efforts on the visual appearance and surface treatment of aluminum coils. The five distinct processes for surface treatment of coated aluminum coils are explained in detail below:
To achieve a bright and smooth surface, use mechanical, chemical, or electrochemical methods to reduce the surface roughness of the workpiece. Mechanical polishing, chemical polishing, and electrolytic polishing are the three main types of polishing. After mechanical and electrolytic polishing, the aluminum coil can achieve the mirror effect of stainless steel, giving people a sense of high-end simplicity and a fashion future.
The process of cleaning and roughening a metal surface with a high-speed sand flow. This method of surface treatment of aluminum parts can achieve a certain degree of cleanliness and different roughness on the workpiece's surface, as well as improve the mechanical properties of the workpiece's surface, thus improving fatigue resistance and increasing the distance between the workpiece and the coating. Excellent adhesion extends the life of the coating film and aids in the leveling and decoration of the coating. This process is frequently seen in Apple's various products, and it is also increasingly used in existing TV casings or middle frames.
Cutting uses an engraving machine to strengthen the diamond knife on the engraving machine's high-speed rotating (generally 20,000 rpm) spindle to cut parts and produce local highlight areas on the product surface. The speed of the milling drill bit influences the brightness of the cutting highlight. The brighter the cutting highlight is, the faster the drill speed, otherwise the darker it is and it is easy to produce knife lines. High-gloss cutting is particularly popular in mobile phones, such as the iPhone 14. In recent years, some high-end TV metal frames have adopted high-gloss milling technology in conjunction with anodic oxidation and wire drawing technology, resulting in a TV set that is both fashionable and technologically advanced.
The electrochemical oxidation of a metal or alloy is referred to as anodizing. After the aluminum coil is cut into a plate shape, the aluminum product (the process of forming an oxide film on the anode) is formed due to the action of the applied current under the corresponding electrolyte and specific process conditions. Anodizing can not only correct flaws in aluminum surface hardness and wear resistance, but it can also extend the service life of aluminum and improve its aesthetics. It has become an essential component of aluminum surface treatment. It is currently popular and very successful.
Two-color anodizing is the process of anodizing a single product and applying different colors to different areas. Because of the complexity of the process, two-color anodizing is expensive, but the contrast between the two colors can better reflect the product's high-end and unique appearance.
Metal wire drawing is a manufacturing process in which aluminum coils are scraped out of lines with sandpaper repeatedly. Straight drawing, random drawing, spiral drawing, and thread drawing are the four types of drawing. The metal wire drawing process clearly shows every tiny silk trace, allowing the fine hair to shine in the metal matte, and the product to have both fashion and technological sense.
These five distinct techniques can greatly improve the appearance, image, and quality of aluminum coils, as well as the user experience so that more and more users prefer colorfully coated aluminum coil products.
