As a widely used material in industries such as construction and home appliances, the quality of color coated rolls has attracted much attention. Here are some common quality issues and their root causes analyzed.
Poor adhesion of coating
Coating adhesion is an important quality indicator for color coated coils. Poor adhesion is manifested as the coating being prone to detachment during processing or use. The main reason is incomplete surface treatment of the substrate, such as the presence of impurities such as oil stains and rust, which affect the bonding between the coating and the substrate; Improper coating process parameters, such as uncontrolled curing temperature and time of the coating, result in insufficient curing of the coating and decreased adhesion.
Color difference issue
Color difference in painted rolls can affect their appearance and usability. The reasons for color difference include quality differences between paint batches, variations in pigment content and particle size among different batches of paint; Unstable operation of painting equipment, such as fluctuations in paint supply and spraying pressure, resulting in uneven coating thickness and color differences; Inconsistent baking temperature and time can affect the color of the coating.
Coating scratch
During production, transportation, and storage, the surface of color coated rolls is prone to scratches. The surface of the guide rollers and conveyor devices on the production line is not smooth or has foreign objects, which can scratch the coating; Improper packaging during transportation, friction and collision between rolls, and between rolls and transportation vehicles; Poor storage environment, such as uneven ground, can also cause scratches on color coated rolls due to compression.
Poor corrosion resistance of the coating
The corrosion resistance of color coated rolls is related to their service life. Poor corrosion resistance may be due to insufficient coating thickness, which cannot effectively block corrosive media; The coating itself has poor chemical resistance and cannot resist specific environmental erosion; Insufficient thickness or quality defects of the galvanized layer on the substrate affect the overall corrosion resistance.
Coating foaming
Blistering of coatings is also common. The main reason is that the substrate surface is damp or contains moisture, which evaporates during the coating curing process to form bubbles; The solvent in the coating evaporates incompletely and remains in the coating, causing gas to form bubbles when heated; The high humidity in the painting environment affects the drying and curing of the coating, increasing the possibility of foaming.
The quality problem of color coated rolls is caused by multiple factors. Production enterprises need to strictly control the quality of raw materials, optimize production processes, strengthen quality control in the production process, and attach importance to transportation and storage links to ensure stable and reliable quality of color coated coils and meet market demand.
Post time: Apr-24-2025