szczegółowe informacje o produktach

Do domu > produkty >

Galvanized Color-coated Coil Is A Material With Excellent Performance.

produkty

Płyty z magnezu, manganu i aluminium

Płytka stalowa z cyny tytanowej

Płyty do przechowywania w chłodzie

Płaszczyznowy dom kontenerowy

Skontaktuj się z nami

Mr. Mr Zhang

Jack@zqppgi.com

86-543-3367365

15154399969

Skontaktuj się teraz

Galvanized Color-coated Coil Is A Material With Excellent Performance.

MOQ:	1 tona
Ceny:	400-700 USD/Ton
standard packaging:	Pakiet standardowy
Delivery period:	7 - 15 dni
metoda płatności:	L/C, T/T.
Supply Capacity:	20000 stóp/miesiąc

Details Information

Opis produktu

Szczegółowe informacje

Miejsce pochodzenia

Chiny

Nazwa handlowa

ZHONGQIANG

Orzecznictwo

Numer modelu

0,29*1044

Technika:

Gorąco toczyło się

Stalowa płyta

Materiał powłoki:

PE, PVDF, epoksyd

Połysk:

10-90%

Wytrzymałość na rozciąganie:

135-155MPA

Obróbka powierzchniowa:

Powlekane, tłoczone

Wytłoczony arkusz Al:

0,8 mm-7,0 mm

Długość:

1000-6000 mm lub na życzenie klienta

Opis produktu

Production Process of Galvanized Color-Coated Coil

The production process of galvanized color-coated coil refers to a procedure that takes galvanized steel sheets as the base material and forms a uniform, firm organic coating on their surface through multiple continuous and refined processing steps. Its core goal is to balance the corrosion resistance of the base material with the decorativeness and functionality of the coating, while meeting the efficiency and quality requirements of industrial continuous production. The complete process can be divided into three core stages: "Base Material Pretreatment", "Coating Application & Curing", and "Post-Processing & Finished Product Inspection". The specific processes and key details are as follows:

I. Base Material Pretreatment Stage: Removing Impurities and Enhancing Coating Adhesion

This stage serves as the "foundation" for ensuring tight bonding between the coating and the galvanized base material. It requires thorough removal of impurities such as oil stains, oxide layers, and dust from the base material surface, while improving surface activity through chemical treatment to prevent subsequent coating peeling or blistering. The main processes include:

1. Uncoiling and Leveling of Base Material

The raw material is galvanized steel coils (hot-dip galvanized/electro-galvanized sheets, usually with a thickness of 0.15-2.0mm). The steel coil is smoothly unrolled by an uncoiler, and then the bent or wavy deformations of the steel sheet are corrected by a leveler (multi-roll structure). This ensures the steel sheet runs smoothly in subsequent processes and the coating thickness remains uniform.

2. Degreasing (Oil Removal)

During rolling and storage, the surface of galvanized steel sheets may retain oil stains such as rolling oil and anti-rust oil, which need to be treated in a degreasing tank: Alkaline degreasing agents (e.g., sodium hydroxide, sodium carbonate solutions) are injected into the tank. After the steel sheet is continuously soaked or sprayed, the oil stains are emulsified and decomposed, and then rinsed off with high-pressure water to prevent oil stains from affecting coating adhesion.

3. Pickling (Optional, for Base Materials with Severe Oxidation)

If slight oxidation spots (white rust) appear on the galvanized layer surface due to improper storage, the oxide layer needs to be removed using a pickling tank (dilute hydrochloric acid or dilute sulfuric acid solution), while slightly activating the galvanized surface. After pickling, the steel sheet must be immediately rinsed with clean water to prevent residual acid from corroding the base material.

4. Chemical Conversion Treatment (Key Process)

This is a core step to improve coating adhesion. A very thin (several nanometers to tens of nanometers), dense conversion film is formed on the galvanized layer surface through chemical reactions (common types include "chromate conversion film" or "chromium-free conversion film", with the latter being more environmentally friendly).

Functions of the conversion film:
① Isolating air to prevent secondary oxidation of the galvanized layer;
② The conversion film has a porous structure and strong polarity, which can form chemical bonds with resin molecules of the subsequent coating, significantly enhancing the bonding strength between the coating and the base material and avoiding coating peeling during long-term use.
Treatment method: The steel sheet continuously passes through a conversion treatment tank (by soaking or spraying). After the reaction is completed, it is preliminarily dried with hot air to ensure the surface is dry and free of moisture.

II. Coating Application & Curing Stage: Forming a Uniform, Wear-Resistant Organic Coating

This stage is the core of "endowing the product with appearance and functionality". It requires precise control of coating thickness, curing temperature, and time to ensure the coating has uniform color and meets performance standards (e.g., weather resistance, impact resistance). According to the coating structure (usually "primer + topcoat", with "backcoat" added for some high-end products), the process involves multiple coating-curing cycles. The specific steps are as follows:

1. Primer Application and Pre-Curing

Function of primer: Acting as an "intermediate bridge", it not only bonds tightly with the base material’s conversion film but also provides a good adhesion foundation for the topcoat. Meanwhile, it enhances the overall corrosion resistance of the coating (some primers contain anti-rust pigments such as zinc powder and zinc phosphate).
Application method: A roll coater is used (the most mainstream method, divided into "forward roll coating" and "reverse roll coating"). By adjusting the pressure and rotation speed between the coating rolls and the base material, the wet film thickness of the primer (usually 5-10μm) is controlled to ensure no missing coating or sagging.
Pre-curing: The steel sheet with primer applied enters a hot-air drying oven (first furnace section), where it is dried at 100-150℃ to remove solvents (e.g., xylene, ethyl acetate) from the primer. This allows the primer to be pre-cured (not fully cured, with some residual activity to facilitate bonding with the topcoat).

2. Topcoat Application and Full Curing

Function of topcoat: Determines the product’s appearance (color, texture, gloss) and core functions (weather resistance, stain resistance, wear resistance). The topcoat formula is adjusted according to application scenarios (e.g., topcoats for outdoor use need to add "weather-resistant resins" such as PVDF fluorocarbon resin and high-weather-resistance polyester resin; ordinary polyester resin can be used for indoor applications).
Application method: Same as the primer, a roll coater is still used. For texture effects such as "wood grain" or "stone grain", an "embossing roll" is used for simultaneous texture pressing, or "digital printing" is adopted to achieve customized patterns.
Full curing: The steel sheet with topcoat applied enters a curing oven (second furnace section, with a higher temperature, usually 200-250℃). At high temperatures, the resin in the topcoat (e.g., polyester, fluorocarbon) undergoes a cross-linking reaction to form a dense, hard cured coating, and solvents are completely volatilized. The curing time must be precisely controlled (usually 30-60 seconds, adjusted according to coating thickness): insufficient time leads to incomplete curing (coating is easy to scratch), while excessive time causes resin aging and discoloration.
Backcoat Application (Optional): For some products (e.g., color-coated coils for construction), a "backcoat" (usually epoxy or polyester resin) needs to be applied to the back of the steel sheet. Its function is to prevent rust on the back of the steel sheet (especially when used for roofs or walls, where the back contacts air or insulation layers). The application and curing process is the same as that of the topcoat.

III. Post-Processing & Finished Product Inspection Stage: Ensuring Stable Quality and Facilitating Storage & Transportation

This stage mainly involves physical treatment and quality screening of the cured color-coated coils to ensure the finished products meet standards.

1. Cooling Treatment

The temperature of the color-coated steel sheet coming out of the curing oven is over 200℃, so it must immediately enter a cooling system: First, it undergoes "air cooling" (preliminary cooling with high-pressure cold air), then "water cooling" (cooling with cold water rolls or cold water spraying) to lower the temperature to below 50℃. This prevents steel sheet deformation or coating adhesion caused by high temperatures.

2. Surface Protection (Optional)

To prevent the coating from being scratched during transportation and storage, a protective film is applied to the topcoat surface of some color-coated coils (transparent PE protective film, with a thickness of 20-50μm). The film application is completed simultaneously by a film laminator, and the film’s adhesiveness must be moderate (easy to peel off during subsequent construction without leaving adhesive residue).

3. Coiling and Slitting

The cooled color-coated steel sheet is guided to a coiler by a tension control system (to ensure uniform coiling tension) and rolled into finished steel coils that meet customer requirements (inner diameter is usually 508mm or 610mm, and outer diameter is adjusted according to order requirements). If customers need cut-to-length flat sheets, the steel sheet is cut into fixed-size flat sheets by a slitting machine (for width slitting) and a cutting machine (for length cutting) before coiling.

4. Finished Product Inspection (Key Quality Control)

Each finished coil must pass multi-dimensional inspections before leaving the factory. The inspection items include:

Appearance inspection: Visual inspection for coating defects such as missing coating, pinholes, sagging, color difference (compared with standard color cards), and scratches;
Performance inspection: Sampling and testing of coating thickness (using a coating thickness gauge, total thickness of primer + topcoat is usually 20-50μm), adhesion (cross-cut test: cutting a cross grid with a cutter, no coating peeling after tape adhesion), impact resistance (drop ball test: no cracks or peeling of the coating when a steel ball falls from a specified height), and weather resistance (accelerated aging test: simulating ultraviolet rays, high temperature, and high humidity to test coating discoloration and chalking);
Dimensional inspection: Testing the thickness, width, length of the steel sheet, and coil diameter to ensure compliance with order requirements.

IV. Core Process Characteristics and Environmental Trends

1. Continuous Production

The entire production line operates in a closed-loop continuous mode, with a speed of usually 30-100 meters per minute and a daily output of up to several thousand tons, meeting the needs of large-scale industrial production.

2. Environmental Upgrading

Traditional processes partially use chromate conversion films and solvent-based coatings (containing VOCs). Currently, the mainstream trend is to adopt "chromium-free conversion films" and "water-based coatings" (reducing VOC emissions by more than 80%), while equipping with waste gas treatment systems (e.g., RTO regenerative thermal oxidizers) to reduce environmental pollution.

Through the above processes, galvanized color-coated coils ultimately achieve comprehensive performance of "base material corrosion resistance + coating decorativeness + processing adaptability", becoming a core material in fields such as construction, home appliances, and transportation.

Tagi:

wstępnie malowana cewka aluminiowa,

szczegółowe informacje o produktach

produkty

Kolorowa cewka aluminiowa

Cewki stalowe

Cewka stalowa PPGI

Stalowe arkusze stalowe PPGI

Płyty z magnezu, manganu i aluminium

Tałka aluminiowa do dachu

Tłoczona aluminiowa cewka

Domowa folia aluminiowa

Płytka stalowa z cyny tytanowej

Płyty do przechowywania w chłodzie

Board oczyszczania

nano tabliczka izolacyjna

Dom kontenerowy

Zdejmowany dom kontenerowy

Składany dom kontenerowy

Płaszczyznowy dom kontenerowy

Galvanized Color-coated Coil Is A Material With Excellent Performance.

MOQ:	1 tona
Ceny:	400-700 USD/Ton
standard packaging:	Pakiet standardowy
Delivery period:	7 - 15 dni
metoda płatności:	L/C, T/T.
Supply Capacity:	20000 stóp/miesiąc

Szczegółowe informacje

Opis produktu

Szczegółowe informacje

Miejsce pochodzenia

Chiny

Nazwa handlowa

ZHONGQIANG

Orzecznictwo

ISO

Numer modelu

0,29*1044

Technika:

Gorąco toczyło się

Typ:

Stalowa płyta

Materiał powłoki:

PE, PVDF, epoksyd

Połysk:

10-90%

Wytrzymałość na rozciąganie:

135-155MPA

Obróbka powierzchniowa:

Powlekane, tłoczone

Wytłoczony arkusz Al:

0,8 mm-7,0 mm

Długość:

1000-6000 mm lub na życzenie klienta

Minimalne zamówienie:

1 tona

Cena:

400-700 USD/Ton

Szczegóły pakowania:

Pakiet standardowy

Czas dostawy:

7 - 15 dni

Zasady płatności:

L/C, T/T.

Możliwość Supply:

20000 stóp/miesiąc

Opis produktu

Production Process of Galvanized Color-Coated Coil

I. Base Material Pretreatment Stage: Removing Impurities and Enhancing Coating Adhesion

1. Uncoiling and Leveling of Base Material

2. Degreasing (Oil Removal)

3. Pickling (Optional, for Base Materials with Severe Oxidation)

4. Chemical Conversion Treatment (Key Process)

Functions of the conversion film:
① Isolating air to prevent secondary oxidation of the galvanized layer;
② The conversion film has a porous structure and strong polarity, which can form chemical bonds with resin molecules of the subsequent coating, significantly enhancing the bonding strength between the coating and the base material and avoiding coating peeling during long-term use.
Treatment method: The steel sheet continuously passes through a conversion treatment tank (by soaking or spraying). After the reaction is completed, it is preliminarily dried with hot air to ensure the surface is dry and free of moisture.

II. Coating Application & Curing Stage: Forming a Uniform, Wear-Resistant Organic Coating

1. Primer Application and Pre-Curing

Function of primer: Acting as an "intermediate bridge", it not only bonds tightly with the base material’s conversion film but also provides a good adhesion foundation for the topcoat. Meanwhile, it enhances the overall corrosion resistance of the coating (some primers contain anti-rust pigments such as zinc powder and zinc phosphate).
Application method: A roll coater is used (the most mainstream method, divided into "forward roll coating" and "reverse roll coating"). By adjusting the pressure and rotation speed between the coating rolls and the base material, the wet film thickness of the primer (usually 5-10μm) is controlled to ensure no missing coating or sagging.
Pre-curing: The steel sheet with primer applied enters a hot-air drying oven (first furnace section), where it is dried at 100-150℃ to remove solvents (e.g., xylene, ethyl acetate) from the primer. This allows the primer to be pre-cured (not fully cured, with some residual activity to facilitate bonding with the topcoat).

2. Topcoat Application and Full Curing

Function of topcoat: Determines the product’s appearance (color, texture, gloss) and core functions (weather resistance, stain resistance, wear resistance). The topcoat formula is adjusted according to application scenarios (e.g., topcoats for outdoor use need to add "weather-resistant resins" such as PVDF fluorocarbon resin and high-weather-resistance polyester resin; ordinary polyester resin can be used for indoor applications).
Application method: Same as the primer, a roll coater is still used. For texture effects such as "wood grain" or "stone grain", an "embossing roll" is used for simultaneous texture pressing, or "digital printing" is adopted to achieve customized patterns.
Full curing: The steel sheet with topcoat applied enters a curing oven (second furnace section, with a higher temperature, usually 200-250℃). At high temperatures, the resin in the topcoat (e.g., polyester, fluorocarbon) undergoes a cross-linking reaction to form a dense, hard cured coating, and solvents are completely volatilized. The curing time must be precisely controlled (usually 30-60 seconds, adjusted according to coating thickness): insufficient time leads to incomplete curing (coating is easy to scratch), while excessive time causes resin aging and discoloration.
Backcoat Application (Optional): For some products (e.g., color-coated coils for construction), a "backcoat" (usually epoxy or polyester resin) needs to be applied to the back of the steel sheet. Its function is to prevent rust on the back of the steel sheet (especially when used for roofs or walls, where the back contacts air or insulation layers). The application and curing process is the same as that of the topcoat.

III. Post-Processing & Finished Product Inspection Stage: Ensuring Stable Quality and Facilitating Storage & Transportation

This stage mainly involves physical treatment and quality screening of the cured color-coated coils to ensure the finished products meet standards.

1. Cooling Treatment

2. Surface Protection (Optional)

3. Coiling and Slitting

4. Finished Product Inspection (Key Quality Control)

Each finished coil must pass multi-dimensional inspections before leaving the factory. The inspection items include:

Appearance inspection: Visual inspection for coating defects such as missing coating, pinholes, sagging, color difference (compared with standard color cards), and scratches;
Performance inspection: Sampling and testing of coating thickness (using a coating thickness gauge, total thickness of primer + topcoat is usually 20-50μm), adhesion (cross-cut test: cutting a cross grid with a cutter, no coating peeling after tape adhesion), impact resistance (drop ball test: no cracks or peeling of the coating when a steel ball falls from a specified height), and weather resistance (accelerated aging test: simulating ultraviolet rays, high temperature, and high humidity to test coating discoloration and chalking);
Dimensional inspection: Testing the thickness, width, length of the steel sheet, and coil diameter to ensure compliance with order requirements.

IV. Core Process Characteristics and Environmental Trends

1. Continuous Production

2. Environmental Upgrading

Tagi: