Color steel coil is widely used in society and plays an important role in new buildings. Then the following problems occur:
Features: due to the external impact of the steel strip, the surface of the plate appears prominent or concave, some with a certain distance, some without.
Causes: 1. Foreign matters mixed in the roller during coating. 2. Binding marks of sheet products during binding. 3. External impact during rewinding.
2. Edge bubble
Features: paint on both sides, after drying, bubbles appear.
Causes: raw materials with burr stained with paint, cracks on both sides.
3. pock marks
Features: after coating, some or all surfaces of foreign matters or dust mixed in from the outside have rice grain like protrusion.
Causes: 1. Other kinds of coatings or coatings of other companies are mixed in the coating. 2. Foreign matters mixed in the coating. 3. Poor water washing during pretreatment.
4. Poor bending (T-bend)
Features: during the 180 degree bending test of steel, the coating on the processing part cracked and peeled off.
Causes: 1. Too much pre-treatment. 2. The coating thickness is too thick. 3. Over baking. 4. The lower coating is different from the manufacturer of the coating, or the thinner is not used properly.
5. Poor hardness (pencil hardness)
Features: draw a scratch on the coating surface with drawing pencil, and leave a scratch on the surface after wiping.
Causes: 1. Low furnace temperature, insufficient coating curing. 2. Improper heating conditions. 3. The coating thickness is thicker than the specified thickness.
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