1. Poor bending (T-bend)
When the high quality PPGI corrugated roofing sheet is bent at 180 degrees, the coating at the processing site is cracked and the coating is peeled off.
a. The amount of pre-processing is too much.
b. The coating thickness is too thick.
c. Excessive baking.
d. The undercoating paint is different from the manufacturer of the top coating, or the use of thinner materials is improper.
2. Poor hardness (pencil hardness)
Use a drawing pencil to force the surface of the high quality color corrugated steel sheet and wipe the back surface to leave a scratch.
a. The furnace temperature is low and the coating is not cured sufficiently.
b. The heating conditions are not appropriate.
c. The thickness of the coating is thicker than specified.
Due to the external impact of the steel strip, the surface of the board appears protruding or concave, some have a certain spacing, and some do not.
1. Foreign matter is mixed in the roller during painting.
2. The streaks of the thin plate products during the bundling.
3. When subjected to rewinding, it is subject to external impact.
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High Technology Industrial Development Zone,Taian,China