This article will introduce the method of testing the quality of prepainted aluminum coil:

1. Film thickness of prepainted aluminum coil:

Suitable film thickness is very important for the long-term performance of the film. For primers, low film thickness may lead to premature corrosion or poor adhesion. In the case of topcoats, low film thickness may lead to premature failure due to weathering.

2. Color of prepainted aluminum coil:

One of the main reasons to buy color products is to provide a specific color appearance. Because customers often match pre-painted metal to other components of a building or product, matching specified color standards is important for the aesthetic appearance of the final assembled product. For repeated colors, matching the criteria on each run ensures that the colors remain consistent over time.

Colors must be consistent across strip widths and across order rolls. Many factors can affect color: paint formulation and quality, film thickness, substrate color, curing temperature (PMT) and residence time in the curing furnace, and even contamination from other paints.

3. Gloss of prepainted aluminum coil:

Consistency of gloss is important to provide a uniform look to the customer. The final product may consist of multiple components made from different coils. If the gloss is not consistent, the final product will have a poor appearance and will not look good.

4. Adhesion of prepainted aluminum coil:

One of the main advantages of color coated rolls is that it can be molded after painting, so these tests are important to ensure that the paint is not damaged or removed during subsequent processing.

Factors that affect adhesion include paint formulation, film thickness, curing temperature (PMT), line speed, quality of treatment, quality of aluminum and steel, and cleanliness.

5. Curing degree of prepainted aluminum coil:

Curing is the term for the degree to which a material has changed from its initial state to its final or cured state.

All coil coatings are baked, and two things happen during the baking process:

1) The solvent in the paint evaporates and burns in the afterburner.

2) Chemical reactions in the paint film bind the resin molecules together (polymerization or cross-linking) to form a strong cross-linked solid paint film.

Uncured paint will tend to be soft and will not withstand molding or weathering in its final use. Overcured paint tends to become brittle and may be damaged during molding or weathering.