The Causes of Defects in Color Coated Aluminum Coils
During the coating process of the color coated aluminium coil, there may have some processing defects such as the missed coating and discoloration. What are the reasons of its defects? As a color coated coil manufacturer, we like to make an analysis for you.
1. Raw Material
The coating and the aluminum coil are the two main factors that can affect the coating quality during the coating process. Due to the color difference between the batches of the coating, low coating rate because of the coating quality, bad fuse of the coating and solvent and, all these will directly affect the coating effect and cause defects.
The unevenness of the aluminum coil substrate, uneven film thickness, and poor edge curve also directly affect the product quality and overall use. Therefore, when selecting raw materials, it should be strictly controlled.
2. Processing craft
The coating process is closely related to the quality of the coating, and the relative linear velocity ratio of the coating roller, paint roller, metering roller and substrate is required to be controlled within a certain range.
According to different systems and the film thickness of the coating products, a certain viscosity range should be set for the coating to ensure the smooth progress of the coating and ensue the coating quality.
For the curing process of paint, the oven control needs to be controlled according to the requirements, and it cannot be changed arbitrarily, otherwise it will seriously affect the color difference and performance of the color coated aluminium coil.
3. Equipment
The aluminum coil coating equipment is required to to be intact. The coating equipment needs to run smoothly without horizontal and vertical vibrations. The coating roller needs to be finely ground. The lateral jitter of the rollers of the coating machine need to be controlled within the allowable range, otherwise it will seriously affect the coating surface quality.
4. Surrounding
The painting room should be clean, dust-proof, insect-proof and of good ventilation performance, ensuring that the quality of the painted surface is not contaminated. At the same time, the process conditions need to make change in time due to the changes of temperature.
5. Human factors
The technical proficiency and operation standardization of the operators are the key to obtain high-quality coating effect. Therefore, it is necessary to strengthen the training of the operator and let the operator master the principles and main points of the coating technology. All the workers should strictly follow the operating procedures to ensure high-quality prepainted aluminum coil.
Original source: https://www.hm-alu.com/a/the-causes-of-defects-in-color-coated-aluminum-coils.html
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