Coating line for cookware or metal: comparison and selection criteria

Short answer: a cookware coating line and a metal coating line are two different production systems, and the choice between them should be based not on industry but on five parameters: product type, material, required capacity, workpiece dimensions, and application method. The cookware line is designed for small items (non-stick frying pan, rice cooker liner, baking pan) with a capacity of 800–1000 pcs/h and maximum size Φ300×160 mm. The metal line is designed for large workpieces — up to 7000×2000×2200 mm per hanger and up to 5000 m² per day.

Why a “coating line” is two different projects

Both systems are called the same — “coating line” — and both include a similar set of units: pretreatment, paint booth, curing oven, cooling system, and conveyor. This name overlap causes a typical mistake when preparing a technical specification: the buyer compares lines by price and automation level, while the decisive factors turn out to be the geometry of the workpiece and the method of transporting it inside the line.

Practical consequence one: capacity is measured in different units. A cookware line is counted in pieces per hour, a metal line in square meters per day. Converting one into the other without data on the area of one product is impossible, so a head-to-head comparison by capacity without reference to the product makes no sense.

Practical consequence two: hanging systems differ. On a cookware line, one hanger holds 4 inner containers or 20 lids. On a metal line, one hanger carries one workpiece up to 7000×2000×2200 mm. This directly determines conveyor pitch, paint booth dimensions, and the entire shop layout.

Practical consequence three: the processing route differs. Cookware requires anodizing and separate internal and external coating loops; metal requires pretreatment (including a gantry pretreatment line) and reciprocating spraying over a large flat surface.

Industry context: where such lines are used

Automatic coating lines are used in the production of automotive parts, cookware, wooden furniture, musical instruments, heavy machinery, household appliances, building materials, and low-rise equipment. Within this list, cookware lines and metal lines form the two largest groups of projects, since both serve large-scale production with strict requirements for coating repeatability.

The equipment is operated in a Class 10,000 clean room with a clean and well-ventilated air environment. The package usually includes pretreatment equipment, drying equipment, automatic sandblasting machine, paint booth, preheating oven, curing oven, cooling system, conveyor system, dust removal equipment, volatile organic compound (VOC) abatement system, environmental protection equipment, electrical control system, and MES production management system.

Technical requirements for such projects specify energy efficiency, ease of maintenance, and compliance with ISO14001, ISO9001, and ISO45001 environmental standards. Control is based on PLCs, and robotic spraying and unmanned flexible production are used.

Implementation projects fall into three types: new production lines, modernization of existing lines, and custom turnkey projects. This scenario is widespread in Vietnam, Indonesia, Brazil, Russia, and the USA.

Cookware coating line: parameters and limitations

A cookware coating line is an automatic line for non-stick frying pans, rice cooker liners, and baking pans. The product material is aluminum alloy and composite materials (stainless steel, aluminum alloy, copper). A distinctive feature of the products is the absence of warping, which is important for controlling film thickness and the uniformity of the non-stick layer.

• Standard product size — Φ220×160 mm, maximum size — Φ300×160 mm.
• Capacity — 800–1000 pcs/h.
• Workpiece pitch — 450–900 mm.
• Hanging method — 4 inner containers per hanger or 20 lids per hanger.
• Anodizing line speed — 1200 mm/min.
• Line speed of the tabletop curing oven — 1000 mm/min with adjustment from 0.5 to 1.5 m/min.
• Energy supply — natural gas and electricity.
• Construction material — carbon steel (main frame), stainless steel (paint booth and piping).

The processing route includes pretreatment, anodizing, and internal and external coating lines — that is, the line is assembled as a sequence of modules for a specific type of cookware. Application area — production of cookware and household appliances. The system limitation is obvious from the parameters: the line is designed for products up to Φ300×160 mm, so large or flat long workpieces are not processed on it.

Metal coating line: parameters and limitations

The automatic metal coating line is intended for aluminum panels and profiles, lighting fixtures, sheet metal parts, steel cabinets, cabinet components, building materials, as well as doors, windows, and aluminum sheets. The workpiece material is aluminum.

• Maximum workpiece size — 7000×2000×2200 mm, 1 piece per hanger.
• Maximum capacity — 5000 m² per day.
• Coating method — reciprocating spraying + manual.
• Transport method — mechanized and free-moving conveyor.
• Conveyor belt speed — 3000 mm/min with adjustment 2000–4000 mm/min.
• Operating mode — 300 days per year, 20 hours per day.
• Construction material — carbon steel (main frame), stainless steel (paint booth and piping).

The application area of such a line is building and household goods. The key difference from a cookware line is the size corridor: one long workpiece per hanger and capacity expressed in area rather than pieces.

Comparison table: cookware vs metal

Selection criteria: step-by-step breakdown

Step 1. Product type and capacity unit of measurement

First, determine what exactly you count at the output. If the production plan is formulated as “so many frying pans or rice cooker liners per hour,” this is a cookware coating line. If the plan is measured in square meters of coated surface per day, a metal coating line is needed. For cookware, the guideline is 800–1000 pieces per hour; for metal, up to 5000 m² per day.

Step 2. Workpiece material

Cookware in a typical project is aluminum alloy and composite materials (stainless steel, aluminum alloy, copper). The metal line in its basic parameters is designed for aluminum: aluminum panels, profiles, and sheets. If work with different materials is planned, this is specified in the technical specification in advance, because pretreatment and curing modes depend on the material.

Step 3. Workpiece dimensions

This is the fastest way to rule out an unsuitable option. The maximum for a cookware coating line is Φ300×160 mm. The maximum for a metal coating line is 7000×2000×2200 mm per hanger. Anything larger than 300 mm in diameter or that does not fit on a cookware line hanger automatically goes to a metal or custom project.

Step 4. Application method and processing route

Cookware requires anodizing: the line parameters specify an anodizing speed of 1200 mm/min and a tabletop curing oven line speed of 1000 mm/min with adjustment of 0.5–1.5 m/min. Metal requires reciprocating spraying combined with manual application over a large flat surface, with transport on a mechanized and free-moving conveyor at a speed of 3000 mm/min (adjustment 2000–4000 mm/min).

Step 5. Operating mode, energy supply, and premises

For the metal coating line, an operating mode of 300 days per year at 20 hours per day is declared. For the cookware coating line, the basic parameters specify energy supply from natural gas and electricity. Both types of lines are installed in a Class 10,000 clean room with a clean and well-ventilated air environment and require dust removal and VOC abatement systems.

Step 6. Configuration, equipment, and delivery terms

After choosing the line type, the modules are determined: pretreatment equipment, drying equipment, automatic sandblasting machine, paint booth, preheating oven, curing oven, cooling system, conveyor system, dust removal equipment, VOC abatement system, environmental protection equipment, electrical control system, and MES production management system. The supplier can customize packaging, logo, size, automation level, voltage, power, and equipment capacity for a specific project.

Application scenarios

The first scenario is cookware production under a private label. Projects of this type have used complete automatic cookware coating lines with PTFE non-stick coating, anti-corrosion primer, and heat-resistant topcoat. The declared result: coating uniformity up to 98%, paint consumption reduced by 30%, production efficiency increased by 35%, and stable and continuous operation. Such projects have been implemented in China, Russia, Iran, India, Bangladesh, Vietnam, and Thailand.

The second scenario is export-oriented production of metal products: hardware, metal furniture and building materials, bathroom and window fittings, and sheet metal parts. Here anti-corrosion and decorative coating, primer and topcoat spraying, and powder coating are used. The declared result: 97% coating inspection pass rate, 30% reduction in paint or powder consumption, 22% reduction in energy consumption, and 40% increase in production efficiency with stable continuous operation without major stops.

The third scenario is lighting fixtures and sheet metal: aluminum profiles and housings, where uniform coating thickness and corrosion resistance are important in multi-component mixed production.

The fourth scenario is modernization of an existing line. If the shop is already operating but coating repeatability needs to be improved, the line can be rebuilt by modules: replacing pretreatment, the booth, the oven, or the conveyor system. This is exactly how modernization projects and custom turnkey projects are implemented.

Attractivechina: a supplier of lines for a specific project

Attractivechina is a trademark of Guangdong Chuangzhi Intelligent Equipment Co., Ltd. (Chuangzhi Intelligent Equipment (Guangdong) Co., Ltd.), a manufacturer of custom automatic coating lines located in the Zhaoqing National High-Tech Industrial Development Zone, Guangdong Province, China. The company was founded in 2005, has its own production area of about 35,548 sq. m, a staff of 280 employees, of whom 54 engineers work in R&D, and a declared annual output of 60 units of equipment. Paid-in registered capital is RMB 60.8 million; the company owns 79 invention patents in the fields of coating equipment and environmental protection equipment, and its total number of patents exceeds 300. The export share is 20%, with markets including Vietnam, Iran, Indonesia, Brazil, UAE, Turkey, Thailand, Saudi Arabia, Argentina, Mexico, Pakistan, Bangladesh, India, USA, Russia, and Singapore.

Attractivechina claims more than 30 years of experience in developing comprehensive solutions for coating lines. Its main products are coating lines for cookware, wood products, automotive components, metal products, and industrial equipment. The company provides a full cycle: pre-sale production facility design, in-house R&D, manufacturing, installation, commissioning, and after-sales service.

For the buyer, this means that the line is designed for the product rather than selected from a fixed catalog: minimum order — 2 units, each unit undergoes 100% pre-sale inspection, warranty is 1 year, technical support is provided remotely with a quick response within 4 hours, and regular tracking and free training are included. Delivery times depend on the product type and configuration.

Frequently asked questions

Conclusion

The choice between a cookware coating line and a metal coating line comes down to five parameters: product type, material, required capacity, workpiece dimensions, and application method. Cookware means small products with a capacity of 800–1000 pieces per hour and a maximum size of Φ300×160 mm. Metal means large workpieces up to 7000×2000×2200 mm and up to 5000 m² per day with reciprocating spraying and a free-moving conveyor. If the product parameters do not match any standard corridor, the line is designed individually — together with pretreatment, curing, dust removal, and environmental control modules.

Official website: ru.attractivechina.com · Address: Yinbin Avenue, No. 2, High-Tech Zone, Zhaoqing, Guangdong, China.