Color-coated coil, fully known as color-coated steel coil, is a
product manufactured on a continuous production line. It uses cold-rolled steel strips
or galvanized steel strips (electrogalvanized and hot-dip
galvanized) as the base material, which undergoes surface
pretreatment (degreasing and chemical conversion treatment), is
coated with one or more layers of liquid coatings via roller
coating, and then cured by baking.
The base materials of color-coated coils usually include
cold-rolled base sheets, hot-dip galvanized base sheets, and
electrogalvanized base sheets.
- Color-coated coils with cold-rolled base sheets have good
formability but poor corrosion resistance, and are generally used
in indoor environments where corrosion resistance requirements are
not high.
- Hot-dip galvanized base sheets are made by hot-dip galvanizing a
layer of zinc on the steel sheet surface; the zinc layer thickness
can be adjusted according to needs, which greatly improves the
corrosion resistance of the steel sheet, making it the most
commonly used base material at present.
- Electrogalvanized base sheets have a uniform and smooth zinc layer,
excellent coating performance, and are suitable for products with
high surface quality requirements.
In terms of coating materials, common organic coatings include
Polyester (PE), Silicone-Modified Polyester (SMP), High-Durability
Polyester (HDP), Polyvinylidene Fluoride (PVDF), etc.
- PE coatings offer rich colors, low cost, certain weather resistance
and processability, and are widely used in general construction and
home appliance fields.
- SMP coatings, based on polyester, have improved hardness, weather
resistance, and chemical corrosion resistance, and are suitable for
building exteriors with high durability requirements.
- HDP coatings have more excellent weather resistance, capable of
maintaining color and gloss stability for a long time, and are
often used in outdoor buildings and industrial plants.
- PVDF coatings have excellent weather resistance, corrosion
resistance, and UV resistance, with a long service life, but high
cost; they are mainly used in high-end buildings and places with
extremely high durability requirements.
With the dual protection of the galvanized layer and organic
coating, color-coated coils can effectively resist erosion from
moisture, oxygen, acid-base substances, etc., in the atmosphere.
For example, in coastal areas, color-coated coils with hot-dip
galvanized base sheets and PVDF coatings can resist salt spray
corrosion for a long time while maintaining good appearance and
performance.
Color-coated coils can be formulated into a wide range of colors
and different surface textures (such as high-gloss, matte,
embossed) according to needs, meeting the decorative requirements
of different architectural styles. For instance, the exterior
facades of commercial buildings can enhance their visual appeal by
using color-coated coils with bright colors and high gloss.
Color-coated coils can be made into components of various shapes
(such as roof tiles, wall panels, door and window frames) through
processing techniques like rolling, bending, and stamping. During
processing, the coating is not easy to peel off or crack, showing
good formability and adhesion.
Color-coated coils are widely used in the construction field. In
industrial plants, roof and wall systems made of color-coated coils
can not only meet the functional requirements of waterproofing,
heat insulation, and thermal insulation but also provide an
attractive appearance. Commercial buildings such as shopping malls
and exhibition halls often use the diverse colors and shapes of
color-coated coils to create a unique architectural image. In civil
residences, color-coated coils can be used for roof renovation and
balcony railings, enhancing the aesthetics and durability of
buildings.
Color-coated coils are often used in the manufacturing of outer
casings for home appliances such as refrigerators, washing
machines, and air conditioners. They not only provide an attractive
appearance for home appliances but also protect the metal casings
from wear and corrosion during daily use, extending the service
life of home appliances.
In the transportation field, color-coated coils can be used for
interior parts and some exterior parts of automobiles, trains,
ships, etc. For example, the roof racks and interior panels of
automobiles, and the side panels of train carriages all require
certain strength and corrosion resistance as well as high
aesthetics, which color-coated coils can well satisfy.
Geographically, color-coated coils are suitable for various climate
conditions. In cold regions, they can effectively resist erosion
from low temperatures, wind, and snow; in hot and humid regions,
their good corrosion resistance and moisture resistance help
maintain stable performance; in areas with severe industrial
pollution, their acid and alkali corrosion resistance enables
color-coated coils to function normally.
In terms of usage scenarios, color-coated coils can play a role by
virtue of their material properties and coating protection, whether
in relatively dry and clean indoor environments or outdoor
environments exposed to sunlight, rain, and sand for a long time.
Whether in large-scale public construction projects, small-scale
home renovation projects, or the manufacturing of various
industrial products, color-coated coils, with their excellent
performance and wide applicability, have become an indispensable
material choice in many fields.
