1. Poor hardness
Features: Use a drawing pencil to force a scratch on the coating surface, leaving a scratch on the surface after wiping
① The furnace temperature is low and the coating is not fully solidified.
② . Improper heating conditions
③ The coating thickness is thicker than the specified thickness
Features: The foreign matter or dust mixed from the outside has rice grain protrusion on part or all of the surface after coating
① . Paint mixed with other kinds or other companies' paint.
② . It is caused by the mixing of foreign matters in the paint.
③ . Poor washing during pretreatment.
3. Poor bending
Features: When the steel is bent 180 degrees, the coating on the processing part cracks and peels off
① The amount of pre-processing is too much.
② The coating thickness is too thick.
③ Excessive baking.
④ The lower coating is different from the coating manufacturer, or the thinner is improperly used.
Features: due to the external impact on the steel strip, the plate surface appears prominent or concave, some have a certain spacing, and some do not occur
① Foreign matters are mixed on the roller during painting.
② The binding marks of sheet products during binding.
③ . External impact during rewinding.
5. Edge bubble
Features: There is paint on both sides, and bubbles occur after drying
Cause: burr on raw material, coating and cracks on both sides
6. Orange peel
Features: The dried surface coating is as rough and uneven as orange peel
① The wet film is too thick.
② When the viscosity of the coating is high.
7. Poor solvent resistance
Features: paint peeling occurs when wiping with butanone
① The baking temperature does not meet the requirements
② There is a problem with the curing of the coating
③ The pretreatment is not clean
In addition, Jinan Color Steel Plate Factory believes that the color coated plate can be cleaned in the maintenance work and ensure that its good characteristics are not damaged during application, which not only ensures its appearance but also ensures the actual effect of application. Come to our website for more relevant content http://www.jnhscg.com consulting service