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Printed Steel Plate
Dec 20, 2018

Printed steel plate, also known as printed color steel plate. It refers to the process of printing various patterns on steel plates by technical means on the basis of various types of substrates.


Application:

Printed steel plate can be used in home appliances, furniture, doors and windows, signs, outdoor decoration, etc.


Substrate Selection:

The substrate may be a cold-rolled substrate, an electrogalvanized substrate, a hot-dip galvanized substrate, or a galvalume steel plate. And materials having suitable mechanical properties may be selected depending on the application.


Cold rolled substrate

Color-coated steel sheets produced from cold-rolled substrates have limited corrosion resistance because any slight scratches on the surface coating will quickly affect the use of red rust. The color coating of such substrates can be used to make internal parts of household appliances, or for low temporary barriers.

Galvanized substrate

The color coated steel plate of the electrogalvanized substrate is protected by the zinc layer, and the corrosion resistance is higher than that of the cold-rolled substrate color coated plate. Since the zinc layer is thin (generally containing zinc content of 20 g/m2), the processing performance is better than that of hot-dip galvanizing. . In the production of products and components that require corrosion resistance, it is conceivable to use an electrogalvanized steel sheet as a substrate for color coating. Such as air conditioning inside and outside components, washing machine or refrigerator casing; interior decorative walls, furniture, lighting equipment, signs and so on.

Hot dip galvanized substrate

The hot-dip galvanized substrate can be selected according to the amount of galvanization, the shape of the zinc layer, and the surface finish.

1>galvanized amount

The galvanizing amount should be selected according to the use environment. The galvanized sheet for color coating is usually 180 g/m2 (double sided), and 275 g is best used in industrial and coastal areas. Galvanized amount of square meters (double sided).

2> Zinc layer morphology surface finishing

The formability of the zinc-iron alloy hot-dip galvanized sheet is inferior to that of the ordinary hot-dip galvanized sheet, so that the ordinary hot-dip galvanized sheet is generally used as the substrate. Hot-dip galvanized sheets of common zinc flowers, small zinc flowers and zinc-free flowers can be used as color-coated substrates. In order to change the surface condition of hot-dip galvanized sheets to make them suitable for color coating, they are generally flattened or Finishing and pulling correction.

Galvalume steel sheet

Since its introduction to the world market in the 1970s, galvalume steel sheets have become the most popular steel sheets for houses and walls. The hot dip alloy coating of galvalume steel sheet contains 55% aluminum, 43.5% zinc and 1.5% silicon, which effectively combines the strength of the steel sheet, the corrosion resistance of aluminum and the zinc's ability to protect the slit and the intermittent sacrificial protection. In a similar environment, the life of a galvalumme steel sheet of the same plating thickness is about four times that of a galvanized steel sheet. Galvalume steel is a product with superior price performance. Its cost is far below that of stainless steel or aluminum, and it has a pleasing light silver-gray appearance.


The choice of Painting:

1. Bottom painting

Primer Type and thickness:

Primer is available in four types: epoxy resin, polyester resin, acrylic resin and polyurethane resin. The primer is generally selected according to the bottom use, use, processing degree, and finish of the top coat. The painting thickness of the primer is usually 5 um.

1> epoxy primer

It has good adhesion to the substrate, water resistance, alkali resistance and chemical resistance. It is the first primer for coils and its flexibility is not as good as other primers.

2> polyester bottom

Good adhesion to the substrate, excellent flexibility, sensitive to humid environments, and less resistant to chemicals than epoxy primers.

3> water-soluble acrylic primer

It has good adhesion to the substrate, excellent flexibility, low organic solvent content, low temperature curing, and unsuitable storage in a humid environment.

4> polyurethane primer

It has good chemical resistance, abrasion resistance, durability and flexibility.


2. Top Paiting

Topcoat type and thickness

The most commonly used topcoats are polyester, silicone modified polyester, polyvinyl chloride plastisol and polyvinylidene fluoride.

1> polyester

Good adhesion, wide range in formability and outdoor durability, and medium chemical resistance.

2, silicon modified polyester

The film has good hardness, abrasion resistance and heat resistance, as well as good outdoor durability and non-powderability, limited gloss retention and flexibility, and high cost.

3, polyvinylidene chloride

It has good formability and color retention, excellent outdoor durability and powder resistance, solvent resistance, limited color and high price.

4, polyvinyl chloride plastisol

Excellent external durability and chemical resistance, damage resistance, aesthetics, and special primers. The surface can be smooth and used for compression or auto-shrinking to form a pattern. The thickness of the coating is generally greater than 100um. In addition to the plastisol, in general, the coating thickness of the primer plus topcoat is >= 20um, and the properties of the product can achieve the intended purpose.

Third, the color and luster of the paint

In general, it can be selected according to the standard color of the manufacturer, which can shorten the workload in the early stage of production. If special color is required, the production time will be longer from the order to the color plate because the paint is firstly placed in the paint production plant and the performance is required. The surface gloss of the coating measured with a 60 degree reflection angle, the greater the value, the higher the gloss, and the light and matt in the paint used in the building is between 30 and 55. This is because high-gloss paint is used to make the reflection of sunlight strong and glare on the building; if it is indoors, it is easy to cause visual fatigue under the light at night.


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