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Color coated plate, aluminum plated zinc plate common problems

1. the head in the raw material unpacking, the most easily found several defects are jagged edge, edge damage, pot bottom roll, overflow edge.

2. the cause of serious poly edge or edge bubbles is the uneven edge of the color substrate.

3. The reason for the side leakage is that the side of the raw material can not be coated with paint due to serious side waves or local impact injuries.

4. star paint removal refers to the paint is spot-like falling off, the possibility of appearing on the production line is less, more occurs when the ministry is used.

5. painted flower refers to the color difference between the same board, rather than the color difference between the standard color plate.

6. Failure to wipe means that the front or back wipe is less than the number of standard provisions.

7. mechanical properties unqualified refers to the mechanical properties of the coating unqualified, such as pencil hardness is not enough, bending performance unqualified, impact performance unqualified.

8. poly edge or edge bubbles may be caused by: paint viscosity is too low, wet film is too thick, coating roller damage, substrate edge is not smooth.

9. the coating surface bubbles may be caused by: the wet film is too thick, the viscosity is too low, the paint has a lot of bubbles in the material tray, the paint solvent is improper, and the line speed is too fast.

10. purchased galvanized sheet edge is not allowed to exist more than 2mm jagged edge and edge crack, no obvious wave edge, burr.

11. hot-dip galvanized substrate procurement standards stipulate the surface quality of galvanized coil, the steel coil is not allowed to have welding seams, the surface is not allowed to have scratches, indentation, crease, impact affect the quality of the color coating surface of the pull correction stripes.

12. The galvanized steel coil has not been passivated or phosphating in the procurement standard for hot-dip galvanized substrate.

13. hot-dip galvanized substrate procurement standards stipulate that the galvanized coil end is neat, the tower shape is less than 30mm overflow edge is not more than 5mm steel coil end is not allowed to impact.

14. hot-dip galvanized substrate procurement standards stipulate that when the galvanized sheet zinc layer bending D=0, the zinc layer has no cracks and falls off.

15. hot-dip galvanized substrate procurement standards stipulate that 0.40mm and below tensile strength of 275~420Mpa, 0.40mm above this 275~450Mpa.

16. hot-dip galvanized substrate procurement standards stipulate that the elongation of 0.3 and below is not less than 25%, 0.30~0.5mm is not less than 28%, 0.50 and above is not less than 30%.

17. color coated substrate for hot dip galvanized zinc layer requirements are, ball punching, folding, cracks must reach a level, zinc layer weight on both sides of ±20g/m.

18. the coating guide plate requires that there are two types of strip wave shape, that is, edge wave and middle wave, if the number of bend and edge wave in the length of the strip is more than 3 or the degree of curl, the degree of edge wave (wave height) is greater than 5mm can not be used as the coating substrate.

19. in the production process, it is found that there is a continuous wave edge of the raw material, and the initial and fine coating should be manually invested in the holder.


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Zhishang Steel Co., Ltd

ABOUT USOverviewThe company mainly deals in color-coated, galvanized, stainless steel pipes, stainless steel coils, stainless steel plates of various materials; hot-rolled series of rebar, medium and heavy plates, coils, I-beams, angle steels, channel steels, H-beams and other steel products and deep processing Service. (The company’s annual invent···

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