Main reasons and solutions:
(1) Poor production environment. There is too much dust in the working environment and the outer packaging, and the dust is mixed into the coating, which affects the appearance of the coating film and the physical and chemical properties of the coating film. Solution: Before the tinplate is sent to the production workshop, the dust on its outer packaging should be removed, try to avoid removing the tinplate outer packaging in the production workshop, and often clean the workshop environment.
(2) There is ashes in the drying room. The solvent or gas in the paint is incompletely burned in the combustion furnace to produce particulate charcoal. When the coated tinplate passes by, the charcoal is absorbed by the wet coating. Solution: Ensure that the burning gas is blue, and clean the drying room regularly. Generally, waste tinplate is used, and a layer of waste paint is applied to its surface. Under the condition of low-temperature baking, the charcoal in the drying room Ash absorption; try not to use high-flammable macromolecular solvents as diluents when reducing coating viscosity.
(3) The residue on the iron frame falls off. The supporting tinplate flower iron frame is in contact with the volatilized solvent molecules during long-term production, and a layer of golden residue accumulates on the surface. This layer of residue accumulates to a certain thickness and is easy to fall off, especially when the production is restarted after the production is stopped. Objects are more likely to fall off when heated. Solution: Regularly clean the iron frame to remove residues.
(4) The paint is stained. The paint manufacturer’s production control is not strict, and there is dirt; when the coating is produced, the paint cleaning and coating device is not thorough, which causes the paint pollution in the later process, especially the colored paint in the previous process, and the later process. This is especially noticeable with colorless paint. Solution: When there are particles in the paint, use a fine filter to filter; when changing the paint during production, the coating device must be cleaned to avoid the paint contamination in the previous process.