The effect of roller coating machine is not ideal analysis and judgment
analysis of poor adhesion of UV paint coating:
1. Insufficient treatment of the substrate, too much water and oil or gold dust and other ornaments on the surface of the sticker;
2. UV paint in the spray to add diluent, color concentrate or color paste too much;
3. Adhesion primer or penetration primer is too thick;
4. Each layer of paint film is not sanded after curing;
5, the paint itself, to see whether the improper storage caused by UV paint has a certain degree of curing or expired deterioration.
analysis of insufficient curing of UV paint coating:
1. Mainly related to UV curing machine, check whether the lamp life is insufficient;
2.UV lamp configuration power is insufficient, improper collocation, pay attention to UV mercury lamp for ordinary UV paint, UV gallium lamp for UV solid color paint;
3. Paint coating amount is too large, easy to surface dry but not practical;
4. The conveying speed of UV curing machine is too fast, and the paint is not sufficiently irradiated.
the reasons for the unsatisfactory effect of UV paint rolling operation:
1. Horizontal lines appear on the rolling coating surface: the substrate is not sanded flat; Rubber roll damage; Reversing the height of the coating wheel drops too low; The conveyor belt speed is faster than the speed of the roller.
2. The roller coating surface appears straight lines: the rubber roller is damaged; The paint leveling time is not enough, and the conveying speed is faster than the coating wheel speed; The reverse coating wheel speed is lower than that of the forward coating wheel.
3. Orange peel appears on the surface of rolling coating: the amount of paint is too large or the viscosity is too large, the paint itself is not smooth, and the substrate is uneven.
4. Oil at the front end of the plate: the amount of coating is too much, the substrate is deformed, the height of the reversing coating wheel is too low, and the conveyor belt speed is lower than the roller speed.
5. Oil pile at the back end of the plate: the substrate is deformed, the height of the coating wheel is too low, and the conveyor belt speed is higher than the roller speed.
the reasons for the unsatisfactory effect of spray UV paint:
1. Uneven film thickness: the knife edge of the coating machine is not parallel, and the knife edge is worn.
2. Bubbles on the surface of the paint film: the paint flow is too large; Paint pump delivery pipe or seal ring rupture resulting in paint mixed with air, solvent or water; Uneven or unexpected sanding of the substrate.
3. Paint curtain break or curtain break: paint flow is too small viscosity is too low, paint pump speed is not uniform or too low, too much debris in the filter screen is not cleaned up in time, knife gap is too large or too small, paint itself characteristics.