Instruction of PPGI
PPGI or color coated steel sheet, also known as ppgi coil, color coated steel sheet, etc. It is made of hot-dip galvanized steel coils as the base material, first surface pre-treated and then coated with one or more layers of liquid. It is coated by roll coating, and finally baked and cooled. Coatings used include polyester, silicon modified polyester with high durability, corrosion resistance and formability. We are a manufacturer of PPGI and PPGL in China. Our PPGI (color coated galvanized steel) and PPGL (color coated galvanized steel) are available in various specifications. We can also provide product life of up to several decades according to customer requirements.
Product Details of PPGI
600-1500mm,according to customer’s requirement
softy，half hard and hard quality
Type of substrate:
hot dipped galvanized,galvalume,electro-galvanized
oiling/passivstion or chromium free passivation /skin pass
3-5MT per coil
export standard package or as request
Terms of price：
FOB, CIF, CFR, EXW
TT, Irrevocable LC at sight, Western union, Ali trade assurance
Color-coated Roll Coating Type :
Polyester (PE), good bacteria, less color, wide range of moldability and outdoor, medium chemical resistance, low cost. Silicon modified polyester
That is (SMP), coated film with good abrasion and heat resistance, good appearance and resistance to sponging, retention and retention, moderate weakness, moderate cost. High acceptability polyester.
That is (HDP), excellent color retention and impact resistance, excellent outdoor reflectivity and resistance, good varnish resistance, obvious color and beautiful appearance. Polyvinylidene fluoride
That is (PVDF), appearance color and resistance, appearance, appearance and resistance to chalking, excellent solvent resistance, good setting, resistance, limited color, high cost.
Coating Structure Type:
Apply twice to the top surface and once to the bottom surface and bake twice.
Apply twice on the upper and lower surfaces and bake once.
Apply twice on the upper and lower surfaces and bake twice.
Use of different coating structures:
The single-layer back paint has poor corrosion resistance and scratch resistance, but it has good adhesion. mainly used in sandwich panels.
The back paint has good corrosion resistance, scratch resistance and processing formability, and has good adhesion.Applicable to single-layer profiled plate and sandwich plate.
The double-layer back paint has good corrosion resistance, scratch resistance and processing formability. Most of them are used for single layer Laminated plate, but its adhesion is poor, so it is not suitable for sandwich plate.
Color coated substrate classification:
Hot dip galvanized substrate
The product obtained by applying organic coating on hot-dip galvanized steel plate is hot-dip prepainted galvanized steel coil. In addition to zinc protection, the organic coating on the surface of hot-dip galvanized color coated plate also plays the role of isolation protection and rust prevention. Its service life is longer than that of hot-dip galvanized plate. The zinc content of hot-dip galvanized substrate is generally 180g / m2 (double-sided), and the maximum zinc content of external hot-dip galvanized substrate is 275g / m2.
Hot dip aluminum zinc plate substrate
The hot-dip aluminum zinc steel plate (55% Al Zn) is used as the new coating substrate, and the aluminum zinc content is generally 150g / ㎡ (double-sided). The corrosion resistance of the hot-dip aluminum zinc plate is 2-5 times that of the hot-dip galvanized plate. When used continuously or intermittently at temperatures up to 490 ℃, there will be no serious oxidation or scaling. The reflection ability of heat and light is twice that of hot-dip galvanized steel plate, and the reflectivity is greater than 0.75. It is an ideal building material and can save energy.
Electro galvanized substrate
Taking the electro galvanized sheet as the base material, the product obtained by baking and coating with organic coating is the electro galvanized ppgi coated coil. As the zinc layer of electro galvanized sheet is thin and the zinc content is generally 20 / 20g / m2, this product is not suitable for making walls and roofs outdoors. However, due to its beautiful appearance and excellent processing performance, it can be mainly used for household appliances, acoustics, steel furniture, interior decoration, etc.
- Good durability, corrosion resistance and longer service life compared with galvanized sheet.
- Good heat resistance. Compared with galvanized steel plate, it is more difficult to change color at high temperature.
- It has good thermal reflection
- It has similar machinability and spraying performance with galvanized steel plate
- It has good welding performance.
It has good performance price ratio, long-lasting performance and ppgi coil price are competitive. Therefore, whether architects, engineers or manufacturers, have been widely used in industrial buildings, steel structures and civil facilities, such as garage doors, drains and roofs.
What are the characteristics of the color coated coil substrate:
Electro galvanized substrate. The coating is thin and the corrosion resistance is not as good as that of hot-dip galvanized substrate.
Hot dip galvanized substrate: dip the steel sheet into the molten zinc tank to make its surface attached with a layer of zinc. The galvanized sheet has good coating adhesion and weldability.
Hot dip aluminum zinc substrate.
The product is plated with 55% aluminum and zinc and has good corrosion resistance. Its service life is more than 4 times that of ordinary galvanized sheet. It is a substitute for galvanized sheet.
Poor bendability of ppgi steel coil (T-bend): When the steel is bent 180 degrees, the plating on the processed part will crack and the plating will peel off. Reason: Too much mastery of pre-treatment. Coating thickness is too thick. Excessive baking. Different manufacturers of primer and top coating, or improper use of thinner.
Poor hardness of ppgi steel (pencil hardness): scratch hard on the surface of the coating with a drawing pencil and leave a scratch on the surface after wiping off. Reason: low oven temperature, coating curing is not sufficient. Improper heating conditions. Coating thickness is thicker than specified.
As far as the current pre painted galvanized steel market is concerned, it is an emerging material respected in the world today. And with the advancement of science and technology, the enhancement of environmental awareness, and the improvement of people’s living standards, color-coated rolls increasingly show strong vitality and broad market prospects. One of the main advantages is that the color-coated roll has the properties of high mechanical strength of steel materials and easy forming, so as to have good decoration and corrosion resistance of the coating material.
Generally speaking, the ppgi prepainted galvanized steel coil currently on the market are made of cold-rolled substrates, hot-dip galvanized substrates, electro-galvanized substrates, and aluminum-zinc-plated substrates. In addition, it is a color-coated steel strip using hot-dip galvanized steel strip as the base material. In addition to the protection of the zinc layer, the organic coating on the zinc layer plays a role of covering and protection to prevent the steel strip from rusting, and its service life is longer than that of the galvanized strip. Long, about 1.5 times. With its many advantages, color-coated rolls in Shandong are widely used in construction, home appliances, automobiles, furniture and light industrial products and other industries.
Mainly affected by the physical and chemical properties and surface quality, and the understanding of various defects is also different, but the overall can be divided into poor quality of the substrate, changes in the surface tension of the coating, improper pretreatment, curing defects, coating defects and Scratched. In addition, we all know that the production process of color-coated rolls is continuous. Once there are quality defects, we need to cooperate closely with the whole line to gradually investigate, find out the cause of the defect and solve it.
The coating of color coated panels not only plays a protective role, but also adds decorative properties and the color is long lasting and not easy to fade. Different types of color coated plate surface can also add different types of colors and embossed printed surface structure. Although the price of traditional steel plate is lower than color coated steel plate, the performance to price ratio of color coated steel plate still has obvious advantages due to the decoration and protection process after forming.
Compared with traditional steel plate, color coated steel plate has the advantages of easy installation, fast construction (without wet work), firm and reliable connection, unrestricted construction season and no secondary decoration. In order to achieve the same decorative effect as the color coated steel plate, the traditional steel plate needs to be coated. Therefore, the construction of color coated plate is fast.
Color-coated panels also have very favorable advantages in construction and interior decoration, not only for fire protection. The coated surface can maintain its luster even under high temperature baking, and the surface color does not change.
In terms of processing, the surface coating of high quality color coated board does not fall off after bending or stamping, and the quality of coating is far more uniform, stable and ideal than that of monomer spraying on the formed metal surface.
In terms of using time, color coated plate is obviously more durable than traditional steel plate, and it can keep the luster without rusting for more than 20-30 years indoors.
If ppgi is not used properly, the result is that the material standard is not high, resulting in waste, is the material performance can not meet the requirements of use, the use needs to be selected according to the use of pre painted galvanized coils.
1. Choice of substrate material
(1) cold-rolled substrate: poor corrosion resistance, can be used to make home appliances parts
(2) galvanized substrate: corrosion resistance than cold-rolled sheet, generally used in the shell of home appliances, furniture, interior decoration.
(3) hot dipped (aluminum) zinc substrate: corrosion resistance, external construction.
2. Coating selection
(1) color: the general color of white gray, navy blue, special color orders to increase the price and order time.
(2) gloss: the film has a high, medium and low gloss. 30-70 csomething O low gloss color coating rollers of the general structure.
3. Choice of coating technology
General outer plate with 2/2ppgi prepainted steel coil site composite plate type can also use 2/1prepainted galvanized steel coil ppgi, EPS composite plate must use 2/1steel coil ppgi, in order to have better adhesion, zinc aluminized plate is generally used for roofing site composite plate, after some process treatment can also use zinc aluminized plate to do EPS composite plate.
4. Problems to be noted in use
(1) When prepainted gi steel coil is used in construction, it should be used from the same manufacturer on the same production line to avoid mixing.
(2)There must be a peritoneal membrane when pressing and forming, such as color-coated panels coated with PVDF and aluminized zinc panels.
(3) When ppgi galvanized steel coil is sheared, the surface of the equipment in contact with PPGI should be covered with a rubber mat.
(4) Remove metal chips in time to avoid scratching the coating on the surface ofcolor prepainted galvanized steel coil.
(5) Zinc can be used as a sacrificial anode to protect the steel, but when used, try to put the cut part of PPGI in a hidden place, and the project has strict requirements for the protection of the cut.
(6) After the installation of the project, the welding joints and metal chips left behind by
The quality of PPGI is mainly the detection of coating pretreatment and coating performance. The pretreatment detection of coating includes two aspects: degreasing and chemical conversion coating. Coating detection includes two aspects of coating detection technical performance (such as adhesion, weakness, impact strength, hardness, skin, etc.) and special properties with protective functions (such as weather resistance, acid and alkali resistance, and oil resistance) . Good performance, and the characteristic performance with protection function, can be tested according to different use requirements, and the above two performance tests can be performed internationally.
The so-called color coated steel plate refers to the color coated steel plate, which is a kind of steel plate with organic coating. At present, color steel plate is widely used in the walls and roofs of large public buildings, public factories, movable plank houses and integrated houses. Identify the advantages and disadvantages of color steel plate, and observe the thickness of substrate and coating. Color steel plate is composed of substrate and color coating or coating. We must first consider the thickness of substrate and coating. A better color steel plate substrate is 0.02-0.05mm, and the coating or coating thickness is often less than 0.15mm. Because the thickness of the substrate is very important in terms of affecting the service time of the color steel plate. Some manufacturers make changes on the substrate and color steel plate coating or coating. They reduce the thickness of the substrate, but increase the thickness of the peritoneum to reduce the production cost of color steel plate, which greatly reduces the service life of color steel plate. Observe the leakage edge of the color steel plate. Of course, I think observing the leakage edge of color steel plate is also a relatively simple method. When we get a color steel plate, we can first observe whether the exposed steel of the color steel plate has fine crystallization, gray, dark and impurities.
If the section is fine crystalline, the quality is superior. The method of listening to sound is also relatively simple, that is, knocking the color steel plate with fingers or hard objects. If the material of the color steel plate is poor, the sound is dull and the metal sound is not obvious; The sound of color steel plate with good material is loud and crisp.