Colour coated steel coil has a wide range of uses across industries. It is mainly used in buildings, automobiles, home appliances, solar energy devices, furniture, etc. In home appliances, the sheets made from these steel coils are mainly used as the side door plate for refrigerators, freezers, air conditioners, and washing machines.
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A steel coil that is coated with decorative paint on both sides is known as a colour-coated steel coil. Steel coils commonly feature polymer coating in various colours and matte, lustre or decorative natural finish. The colour coating protects it from atmospheric corrosion while giving it more strength and durability. Also known as pre-painted steel, colour coated steel is made by putting a steel sheet through surface pre-treatment, then coating for one or more layers, and finally baking and cooling.
Most times galvanised coils are used to produce colour coated steel coils. Usually, paint is applied after giving the hot-rolled and cold-rolled steel coils a metallic coating. Given below are the steps used to produce colour coated steel coils:
Sometimes color coated steel coil manufacturers apply a protective film to avoid mechanical damage to the colour coat.
There are multiple chemical compounds used to colour coat steel. Depending on the type of resin used in colour coating, given below are some key types of colour-coating:
Based on polyether, steel coils with this coating are resistant to high air temperature and corrosion. They feature colour stability, plasticity and longevity and therefore are used in roofing and wall structures, particularly for industrial buildings. These are available in different colours. Wide range of colours and brightness make it perfect for applications like interior and exterior construction materials, assembling metals, and partitions.
PEMA has a smooth and matte surface with micro-roughness and is based on polyether. It has a longer life than PE and sports excellent colour stability with mechanical resistance. This steel can keep its property in any climate and can copy natural materials.
PVDF is a blend of polyvinyl fluoride (80%) and acryl (20%). It shows the highest resistance to non-mechanical environmental exposure. The compound is used for wall cladding and roofing as it features excellent resistance to water, snow, acids and alkali.
This polymer is made of polyvinyl chloride and plasticisers. It possesses a rather thick coating (0.2 mm) which contributes to good mechanical and weather resistance. However, it has relatively poor heat resistance and colour stability.
This coating is made of polyurethane modified with polyamide and acryl. It has improved resistance to ultraviolet radiation and weather exposure, high strength and longevity. Polyurethane is highly resistant to many acids and chemicals typical in an industrial environment.
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SMP paint systems are a combination of polyester and silicon intermediates. Silicon contributes to improving the gloss retention and weather resistance of the polyester coating. SMP-coated material is more difficult to scratch and resistant to chalk and fade.
Colour coated steel uses are many. The colour-coated steel is used in construction, home appliances, furniture, consumer goods and automotive industries. Colour coated steel coil is used for making:
There are many colour coated steel coil suppliers that offer the best quality pre-painted steel coils. To find the best colour coated steel coil manufacturers in India visit Tata nexarc's Procurement where you can get connected with the trusted steel coil suppliers.
1 Influencing factor of film thickness
In the production process of coating Colour Coated Steel Coil, the rolling direction of the backup roll, the coating roll, the draw roll, the roll diameter R, and the gap between the rolls will affect the coating film's thickness. In the reverse coating mode, when the speed of the strip steel is lower than the speed of the coating roller, part of the coating will remain on the coating roller. At this time, the fluid lubrication between the coating roller and the strip is released, the wear is minor, and the coating process is always Stable; when the speed of the strip steel is higher than the speed of the coating roller, the paint on the coating roller can be transferred entirely to the strip steel. Dry friction will occur between the coating roller and the strip steel, which will cause the wear of the coating roller. When the gap between the rollers increases, the thickness of the coating film decreases with the increase of the gap, and the thickness of the remaining coating film of the draw roller increases accordingly. In addition, the smaller the roll diameter R, the more stable the roll coating system and the better the coating quality.
2 Control the coating thickness by adjusting the speed ratio of the rollers
Under specific parameters such as roller speed, belt speed, roller diameter, coating, etc., the roller coating process can be relatively narrow and stable working area. After the rotational speed of the draw roller and the rotational speed of the coating roller are determined, the total amount of coating film supplied by the coating roller to the strip steel per unit of time is also determined. At this time, if the speed of the strip is adjusted, the thickness of the coating film applied on the surface of the strip will change inversely proportional to it. After the traveling speed of the strip steel is fixed, changing the rotation speed of each roll will change the thickness of the coating film on the surface of the strip steel. If the speed ratio of the draw roll and the coating roll is increased, the thickness of the coating film on the surface of the strip will change in direct proportion to it.
3 Control the film thickness by controlling the pressure between the rolls
In actual production, the coating roll and strip are close together without gaps to obtain a thinner coating. In the case of two rigid rolls, it is theoretically impossible for the coating to pass between the applicator roll and the strip to be applied to the strip surface. On the other hand, the coating roll can be applied to the surface of the strip with a polyurethane rubber-lined coating roll. This is also why rubber-lined rollers must be used when rolling strips in production. When the production line speed and the rotation speed of the coating roll are determined, the thickness H1 of the coating film applied to the strip decreases with the increase of the pressure F between the coating roll and the strip.
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