Metal buttons will appear dark or yellow after oxidation and discoloration, which is different from the original color. This is because the buttons come into contact with salt or acidic substances and undergo qualitative oxidation.

The modeling design of metal buttons is different from pure artistic design such as carving, sculpture and painting, which includes modeling, pattern, color, material, practicality, durability, productivity and large-scale industrial production technology.

1, geometric modeling and three-dimensional modeling of shapes

2. Local modeling. Due to productivity, technology, safety and other factors, the most common shapes of metal buttons are round, hexagonal and equilateral, and the most common three-dimensional shapes are round, hemispherical and floating.

The most common local modeling is to model individuals and all local details on the basis of shape modeling, such as adding Arabic numerals, English letters, plane patterns, animals, portraits, flowers, registered trademarks, patterns and so on.

Extended data:

Button inspection methods, requirements and standards:

1, control sample or confirm sample. See if the color and model match the sample.

2, button surface should not have cracks, nicks, uneven and obvious scratches.

3. There are no car cracks and bubbles on the back; No bad edges, uneven thickness.

4, the pattern should be no obvious deformation, no white eyes, white circles and other phenomena.

5, buttonholes should be smooth; Pinholes are punctured, symmetrical, and there are no big eyes. If it is a blind eye buckle, the blind eye groove should be smooth without obvious bursting.

6. After electroplating or other processes, the effect should be uniform. If some special effects are inconsistent, they can be packaged separately.

7. The color difference of buttons in the same batch shall not be lower than the fourth-class standard of GB250, and shall not be lower than the third-class standard of GB250 compared with the incoming samples.

8. Packaging inspection: repackage after the appearance inspection/performance test required by customers are all qualified. Certificates or other labels should be placed in the package. The number of packages shall conform to the regulations, and the actual quantity of each package shall conform to the regulations. If it is found that the tolerance is exceeded due to different thickness or other reasons, a full inspection should be carried out.

Baidu Encyclopedia _ Metal Button