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Defective 11. Primer Not Dry

Description:

The primer is not completely dried in the curing process, and the position that is not dried after vacuum plating, and the paint will be scraped off by hand

Analysis of the causes:

1. UV energy is too weak

2. The product structure is special and there are too many dead corners

3. Fault of UV machine

Key points of quality control:

1.  Confirm whether the number of strong and weak lamps and light energy of UV furnace are consistent with the operation instructions
2. Try to confirm before production and fix production parameters before production
3. Regularly check whether the equipment is inspected and maintained as required, and confirm the maintenance records

Defective 12. Poor Etching

Description:

Poor etching occurs on the surface of products with etching. Compared with the standard vacuum plating sample, the etching effect is not obvious

Analysis of the causes:

1. Primer spraying is too thick

2. Inappropriate primer selection

3. The product design is too shallow in terms of etching

Key points of quality control:

1. During the production process, confirm whether the spraying times and spray gun distance are consistent with the operation instructions, and compare with the standard sample for confirmation during the production process.
2. The etched products are generally thin coated , which shall be tested and confirmed before production
3. Test and confirm before production, and ensure that the etching effect is consistent with the standard sample.

Defective 13. Primer Whitening

Description:

After the primer is cured by UV, the coating surface is dry, the interior is not completely dry, and the uncured part is milky white

Analysis of the causes:

1. The primer coating is too thick, and oil accumulations occur in some parts.

2. The standing time after the primer coating is too long

Key points of quality control:

1. During the production process, confirm whether the spraying times and spray gun distance are consistent with the operation instructions, and compare with the standard sample for confirmation during the production process.
2. Supervise the spraying of UV primer. UV curing is required within 6 minutes after spraying

Defective 14. Fingerprint

Description:

After spraying the UV base or coating the product, the fingerprints that are felt by hand and flow down cannot be wiped.

Analysis of the causes:

1. The product is not firmly clamped, and the hands touch the product after spraying the UV background

2. The handprints on the material surface are not wiped clean

Key points of quality control:

1. During fixture, confirm whether the operation method is consistent with the operation instruction. After clamping, confirm the product status and the rationality of the fixture.

2. During material pre-treatment, confirm whether the operation method is consistent with the operation instruction

Defective 15. Plating color

Description:

Some parts on the surface of the plating layer is white or blue, which is obviously different from that of the normal plating layer

Analysis of the causes:

1. Primer is not dry
2. The baking time of the top coat is too long

Key points of quality control:

1. Confirm whether the actual parameters of the UV furnace are consistent with the operation instructions before production, and confirm the product quality after UV curing
2. When baking the finish coat, confirm whether the parameters set by the oven are consistent with the requirements of the operation instructions

More in the next chapter. Follow LKKER SCM Linkedin Page for chapter updates. 

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