Seven introduction of coating process of mobile phone shell:
1. paint primers and finishes are different from metals, and they
must be cured at low temperatures (usually 60~80 degrees Celsius).
Commonly used topcoat materials are polyurethane (PU) and acrylic
resin coating. Anhui high speed requires a layer of silver paint on
the top of the transparent finish coat when it needs to be coated
with a metallic luster. In order to increase the wear resistance of
UV curing coating surface, usually on the outer surface to spray a
layer of UV curing coating. The brightness required by different
proportion of high UV light UV and Matt UV prepared to meet.
2., spraying method, plastic parts spraying process is divided into
manual spraying and automatic spraying two kinds.
Hand painting: coating thickness and quality are not easy to
control. Mainly used for initial batching, test spraying and
internal surface conductive paint spraying.
Automatic spraying: there are many guns (6 guns and 8 guns, etc.)
spraying. Different spraying angles are adjusted so as to achieve
uniform spraying surface thickness and also to spray with
Note: before spraying, the material code, color and surface
roughness must be determined.
3., coating thickness in order to make the coating color in the
gloss, wear-resistant and other aspects of quality stability, we
must control the coating thickness. Coating thickness measurement
can be directly measured by coating thickness gauge. Spray silver
primer (for the performance of metallic luster) thinner, generally
3~5: M: topcoat coating thickness is generally 8~10, M: coating
thickness is generally 8~15, M.
4. color and brightness can be detected by colorimeter and
luminance meter. This method can quantify data, but its accuracy is
poor. Usually the swatches are checked by comparison.
5. color design department signed by the color code and other ways
of coating color and color brightness requirements, by coating
manufacturers (or with the coating manufacturer) coating and spray
test in automatic spraying line. Comprehensive wiring by the design
department to test jet samples for comprehensive testing, after the
approval of the sample, and determine the paint code. If the design
requirements are not met, the process can be determined after many
times of repetition.
6. wear resistance and anti stripping test, on the "RCA wear
tester" tape wear-resistant test, anti peel strength test with 100
knives and 3M tape to check the percentage of coating off to
7. paint manufacturers at present, domestic and foreign paint
manufacturers are many, they produce paint, paint each have
characteristics, can be selected according to need.