TEL Chen
1. Selecting the right materials is essential not only to meet functional requirements but also to reduce costs effectively. If materials are not chosen properly, it could lead to either over-specification—where performance exceeds what's needed, causing unnecessary waste—or under-specification, where the material fails to meet usage demands, resulting in degradation or failure. Therefore, the demand side must place high importance on rational material selection and consult experts when necessary to ensure optimal results.
2. The choice of color-coated materials involves several key factors, including mechanical properties, substrate type, plating weight, front coating performance, and reverse coating performance. Other important considerations include the application environment, its corrosiveness, expected service life, durability, processing methods, and the degree of deformation the material will undergo during manufacturing.
3. Selection of Mechanical Properties, Substrate Type, and Plating Weight
3.1 Mechanical properties are determined based on the intended use, processing methods, and the degree of deformation required. For applications with low strength requirements and simple forming processes, TDC51D and TDC52D series color-coated steel sheets are suitable. When good formability is needed, TDC53D and TDC54D series should be selected. For load-bearing components, structural steels such as TS280GD and TS350GD series are recommended. Common processing techniques like shearing, bending, and rolling are widely used, and each has specific material requirements. In practice, the mechanical properties of the substrate often replace those of the coated sheet, and the coating process can affect these properties. Additionally, mechanical characteristics may change over time, increasing the risk of defects like ripples or creases during forming. These factors must be carefully considered.
3.2 The type of substrate and the plating weight play a crucial role in determining the corrosion resistance of color-coated panels. Hot-dip galvanized and hot-dip aluminum-zinc alloy substrates are commonly used for building applications due to their excellent corrosion resistance. The plating weight should be selected based on the environmental conditions. In highly corrosive environments, higher plating weights and more corrosion-resistant substrates are recommended to ensure long service life and durability. It's also important to consider the differences in corrosion resistance among various substrate types.
4. Selection of Front Coating Performance
4.1 Front coating performance includes factors such as coating type, thickness, color, gloss, hardness, flexibility/adhesion, and durability. These properties significantly influence the appearance, protection, and longevity of the final product.
4.2 Coating Type
4.2.1 Topcoat
Common topcoats include polyester, silicon-modified polyester, high-durability polyester, and polyvinylidene fluoride (PVDF). Each offers different levels of hardness, flexibility, and durability. Polyester is widely used due to its good balance of cost and performance, while PVDF provides superior durability and flexibility at a higher cost. Silicon-modified and high-durability polyesters offer enhanced weather resistance but may have trade-offs in flexibility.
4.2.2 Primer
Epoxy, polyester, and polyurethane are common primer types. Epoxy offers strong adhesion and corrosion resistance, while polyester provides better flexibility. Polyurethane is known for its overall performance. The choice of primer depends on the coating system and environmental conditions.
4.3 Coating Thickness
Coating thickness directly affects corrosion resistance. Thicker coatings generally provide better protection, so the appropriate thickness should be selected based on the environment’s corrosiveness, desired service life, and durability requirements.
4.4 Color Variation
Color variation can occur during production and use due to factors like batch differences, storage conditions, and exposure to the environment. Both suppliers and customers usually agree on acceptable color tolerances before ordering.
4.5 Gloss Level
Gloss level is chosen based on the application and user preferences. For example, building materials often use medium to low gloss, while household appliances may require high gloss for aesthetic appeal.
4.6 Coating Hardness
Hardness refers to the coating’s resistance to scratches, abrasions, and impacts. It is influenced by the intended use, processing conditions, and transportation requirements.
4.7 Flexibility/Adhesion
Flexibility and adhesion are critical for formability. Materials with higher impact resistance and lower T-bend values are preferred for high-deformation applications.
4.8 Coating Durability
Durability is measured by how well the coating withstands aging and environmental stress. While atmospheric exposure tests are reliable, they are time-consuming and costly. Artificial aging tests, such as neutral salt spray and UV accelerated aging, are commonly used instead. However, these tests may not fully replicate real-world conditions, making direct correlation between test results and actual service life challenging.
4.9 Additional Properties
In some cases, special properties like resistance to organic solvents, acid/alkali resistance, and pollution resistance may be required. These should be clearly specified to meet the application’s needs.
5. Selection of Reverse Coating Performance
The reverse coating is typically selected by the supplier based on the application and environment. In less corrosive conditions, a single layer may suffice for decorative purposes. If insulation materials are applied to the reverse side, this should be noted during ordering to ensure the correct coating is applied. In highly corrosive environments, a two-layer coating is often recommended to enhance protection.
Perforated Sound-Absorbing Panel
Perforated Sound-Absorbing Panel
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