CAUSE ANALYSIS AND TROUBLESHOOTING METHODS OF COATING PROCESS FAILURE

　　What is the cause analysis and troubleshooting method of the coating process failure?

　　Poor bonding occurs

　　1. Improper selection of the adhesive, improper setting of the amount of glue, and wrong proportioning. The type and amount of adhesive should be selected again.

　　2. The diluent contains alcohol and water that consume NCO groups, so that the hydroxyl groups of the main agent do not react. High-purity ethyl acetate should be used.

　　3. The adhesive is absorbed by printing ink and paper, making the coating insufficient. Should reformulate and set the coating amount.

　　4. Insufficient surface treatment of plastic film or beyond the applicable period, making the treatment surface invalid. The plastic film should be replaced.

　　5. The pressure is small, the vehicle speed is faster, and the temperature is low. The temperature and pressure of the film should be increased, and the vehicle speed should be appropriately reduced.

　　Blistering

　　1. The printing ink layer is not dry. It should be hot-pressed and glued again; postpone the coating time to make it dry completely.

　　2. The film is wrinkled or slack, the film is uneven or curled. The film should be replaced and the tension adjusted.

　　3. There are dust and impurities on the surface of the film. It should be cleared in time.

　　4. The adhesive is not evenly coated and the dosage is small. The coating amount and uniformity should be improved.

　　Film wrinkles

　　1. The film transfer roller is unbalanced. The transfer stick should be adjusted.

　　2. Inconsistent tightness or wavy edges at both ends of the film. The qualified film should be replaced.

　　3. The adhesive layer is too thick, and the solvent is not completely evaporated, which affects the viscosity. When pressed by the pressure roller, slippage occurs between the paper and the film. The amount of glue applied should be adjusted to increase the temperature of the drying tunnel.

　　4. The two ends of the electric heating roller and the rubber roller are unbalanced, the pressure is inconsistent, and the linear speed is different. Both rollers should be adjusted.

　　China JIALITE has strong technical force and advanced technology research and development of new technologies and new products, and has now become a leader in the laminating machine industry, and many laminating machines have passed safety certifications in different countries.

　　For more product information about Automatic coating machine, you can click on the relevant link below.

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