Analysis of Causes of Coating Quality Problems of Aluminum Sheet Coil

Coating is one of the most critical processes in the entire aluminum coil coating production line. The quality of the coating product, especially the apparent quality, directly affects the product's decorative effect. Therefore, we must first grasp the common defects in the coating process and their causes.

There are many reasons for the formation of defects, and the common ones are the following 5 categories:

1. Raw materials

Coatings and aluminum coils are the factors that affect the coating quality most during the coating process. Due to the color difference between the coating batches, the coating fineness is not enough and the coating rate is not high, the coating and the solvent are not well matched. Layers, etc. will directly affect the coating effect and produce defects. The unevenness of the aluminum coil substrate, uneven film thickness, and poor edge deflection will also directly affect the product quality and overall use. Therefore, the selection of raw materials should be strictly controlled.

2, equipment

The coating line requires the coating equipment to be intact, the coating equipment must run smoothly, and there must be no horizontal and vertical jitter, and the coating roller must be finely ground. The lateral runout of all rollers of the coating machine must be controlled within the allowable range, otherwise it will seriously affect the surface quality of the coating.

3. Process

The coating process is closely related to the quality of the coating, and the relative linear speed ratio of the coating roller, paint stripping roller, metering roller and substrate is required to be controlled within a certain range. It is necessary to set a certain viscosity range for the coating according to different systems and the film thickness of the coated product to ensure the smooth progress of the coating and promote the improvement of product quality. The curing process of the coating and the oven control must be controlled as required, and should not be changed arbitrarily, otherwise it will seriously affect the color difference and performance of the coated product.

Coating is one of the most critical processes in the entire aluminum coil coating production line. The quality of the coating product, especially the apparent quality, directly affects the decorative effect of the product. Therefore, we must first grasp the common defects in the coating process and their causes.

4. Environment

The interior of the painting room is required to be clean, dust-proof, insect-proof, and ventilated to ensure that the quality of the painting surface is not polluted. At the same time, the process conditions are changed in time due to temperature changes.

5. Human factors

The responsibility of the operator, the technical proficiency and the standardization of the operation are the keys to obtaining high-quality coating results. Therefore, it is necessary to strengthen the training of operators and let the operators master the principles and key points of coating technology, strengthen responsibility, and operate in strict accordance with operating procedures to ensure high-quality coating products.

The above factors are interrelated and affect each other. Sometimes the occurrence of a kind of defect is related to many factors, and specific problems must be analyzed in detail and eliminated one by one.