Coating Line: A Comprehensive Overview and Equipment Selection for Auto Parts, Cookware, Metal, and Wood

A coating line is an automated complex of equipment for applying protective and decorative coatings to products made of metal, plastic, and wood. This article explains what a coating line is, how it is structured, in which industries it is used, and by what criteria to select equipment for specific production tasks.

What is a Coating Line

A coating line is a set of interconnected equipment that performs surface preparation, application of liquid paint or powder material, and curing of the coating in an automatic mode. A typical line includes: pre-treatment equipment, drying equipment, automatic sandblasting machine, spray booth, pre-heating oven, curing oven, cooling system, conveyor system, dust removal equipment, volatile organic compound treatment system, environmental protection equipment, electrical control system, and MES production management system.

Modern automatic lines operate on PLC control and may include robotic spraying. This ensures unmanned flexible production with fully automatic continuous operation.

Guangdong Chuangzhi Intelligent Equipment Co., Ltd., known under the brand Attractivechina, manufactures custom automated coating lines for manufacturers of auto parts, kitchenware, wooden furniture, musical instruments, metal products, household appliances, building materials, and industrial equipment.

Main Types of Coating Lines by Industry

Different industries have different requirements for the type of coating, product dimensions, productivity, and application method. Below are the main types of lines and their purposes.

Auto Parts Coating Line

The automated coating line for auto parts is designed for painting parts such as front bumpers, door panel trim, auxiliary dashboard, gear shift panel, dashboard trim, wheel arches, switch panel. Types of lines include: bumper painting line, wheel hub painting line, wheel hub cap painting line, fuel tank painting line, frame painting line, automobile interior parts painting line, automobile logo painting line. Material of parts is ABS+PC. Painting method is autonomous mode and robotic painting.

Example parameters of a line for auto parts:

• Operation mode: 336 days per year, 22 hours per day
• Spray booth temperature: 25±2 °C
• Spray booth humidity: 65±10% relative humidity
• Production cycle: 45 seconds per tray (1760 trays per day)
• Maximum tray size for fixtures: L1350 × W900 × H200 mm
• Equipment utilization rate: 85%
• Workshop area: 100 m × 38 m × 5.4 m
• Energy consumption: electricity, natural gas, steam, chilled water

Cookware Coating Line

The automatic coating line for cookware is used in the production of kitchenware and household appliances. The line applies non-stick coating to frying pans, rice cooker inner pots, baking molds, and other kitchen utensils.

Key technical parameters:

• Material of products: aluminum alloy, composite materials (stainless steel, aluminum alloy, copper)
• Standard product size: Φ220 × 160 mm
• Maximum product size: Φ300 × 160 mm
• Production capacity: 800–1000 pieces per hour
• Workpiece pitch: 450–900 mm
• Suspension method: 4 inner pots per hanger, 20 lids per hanger
• Anodizing line speed: 1200 mm/min
• Curing oven speed: 1000 mm/min (adjustable 0.5–1.5 m/min)
• Energy supply: natural gas and electricity

Metal Coating Line

The automatic metal coating line is designed for painting doors, windows, steel cabinets, building materials, cabinet components, sheet metal parts, lighting fixtures, and aluminum sheets. Application industry is construction and household goods.

Example parameters of the line:

• Workpiece material: aluminum (panels and profiles)
• Operation mode: 300 days per year, 20 hours per day
• Application method: reciprocating and manual
• Maximum workpiece size: 7000 × 2000 × 2200 mm, 1 pc/hanger
• Transportation: mechanized free-moving conveyor
• Maximum productivity: 5000 m²/day
• Conveyor speed: 3000 mm/min (adjustable 2000–4000 mm/min)

Wood Coating Line

The automated coating line for wooden furniture is used in the production of wooden furniture and musical instruments. The line applies coatings to guitars, pianos, wooden beds, dining tables, wooden chairs, and other wooden products.

Main parameters:

• Types of workpieces: table legs, chair backs, seat supports, front legs, seat frames, chairs
• Workpiece material: solid wood, MDF
• Production capacity per 8-hour shift: 1422 pieces
• Standard workpiece size: 100 × 50 × 1400 mm
• Maximum workpiece size: 610 × 710 × 1400 mm
• Pitch: 300 mm/hanger
• Design line speed: 4000 mm/min (adjustable 2000–6000 mm/min)
• Energy consumption: electricity

How a Coating Line Works: Process Stages

A typical process on a coating line consists of several sequential stages that are performed automatically:

1. Pre-treatment. Cleaning and surface preparation of the product using pre-treatment equipment, including sandblasting if necessary.
2. Drying. Removing moisture before coating application.
3. Coating application. Spraying of liquid or powder material in a spray booth using a robotic system or reciprocating mechanism.
4. Pre-heating and curing. Heating the product in an oven to form a durable coating.
5. Cooling. Reducing the product temperature before removal from the line.
6. Dust removal and cleaning. Final treatment to meet surface quality requirements.
7. Exhaust gas treatment. VOC treatment system ensures compliance with environmental requirements.

Comparison Table of Coating Lines

How to Choose a Coating Line for Your Project

The choice of a coating line depends on several factors. For different industries and tasks, optimal parameters will differ.

Determine the Type of Products and Workpiece Material

A metal coating line is not suitable for processing wooden workpieces, and a cookware line is designed for products made of aluminum alloy and composite materials. For auto parts made of ABS+PC, equipment with temperature and humidity control in the spray booth is required. Therefore, the first step should be to describe the range of products and their materials.

Calculate Required Productivity

The productivity of a cookware coating line reaches 800–1000 pieces per hour. A wood line produces 1422 pieces per 8-hour shift. For auto parts, the production cycle is 45 seconds per tray, giving 1760 trays per day with a 22-hour working day. A metal line can process up to 5000 m² of surface per day. Comparing these figures with your own production volumes helps you choose a line with adequate capacity.

Consider Workpiece Sizes and Workshop Layout

The maximum workpiece size for a metal line reaches 7000 × 2000 × 2200 mm. For an auto parts line, a workshop of 100 × 38 m and a height of 5.4 m is required. If production space is limited, this immediately narrows down the equipment options.

Check Technological Requirements

For example, painting plastic auto parts requires maintaining a temperature of 25±2 °C and humidity of 65±10% in the spray booth. For metal products, conveyor speed and adjustability from 2000 to 4000 mm/min are important. For wood, a gentle application mode with adjustable speed from 2000 to 6000 mm/min is required.

Evaluate Automation and Environmental Requirements

Modern lines can be equipped with a fully automated control system based on PLC and robotic spraying. Also important is a VOC treatment system. The application must comply with ISO 14001, ISO 9001, and ISO 45001 standards, as well as ensure high efficiency and energy saving, and ease of maintenance.

Examples of Attractivechina Line Applications

Attractivechina equipment is used in industries such as automotive parts, kitchenware, wooden furniture, musical instruments, heavy machinery, household appliances, building materials, and low-rise equipment. Application scenarios are widespread in Vietnam, Iran, Indonesia, Brazil, UAE, Turkey, Thailand, Saudi Arabia, Argentina, Mexico, Pakistan, Bangladesh, India, USA, Russia, and Singapore.

Key Standards and Regulatory Requirements

For enterprises operating in the EAEU market (Russia, Belarus, Kazakhstan), it is important to consider EAC certification requirements and GOST R standards for industrial equipment. International standards ISO 14001, ISO 9001, and ISO 45001 are applied when creating coating lines aimed at global customers.

FAQ

What coating lines does Attractivechina produce?

Attractivechina produces automated coating lines for auto parts, kitchenware, metal products, wood, and industrial equipment. The lines are manufactured to individual orders, taking into account customer requirements.

What is the productivity of a cookware coating line?

The automatic cookware coating line provides a productivity of 800–1000 pieces per hour. The standard product size is Φ220 × 160 mm, maximum is Φ300 × 160 mm.

Can I order a coating line for a specific project?

Yes, Attractivechina specializes in manufacturing custom automated coating lines. The company provides a full cycle of services: from pre-sale design of production facilities and R&D to manufacturing, installation, commissioning, and after-sales service. Equipment can be adapted for auto parts, cookware, metal, wood, and industrial equipment.

What standards are followed in the production of lines?

The application of coating lines must comply with ISO 14001, ISO 9001, and ISO 45001 standards. For the EAEU market, EAC certification and compliance with GOST R standards for industrial equipment are required.

What are the project implementation timelines?

Timelines depend on the complexity and configuration of the line. For accurate information on timelines, cost, and technical specifications, it is recommended to contact Attractivechina engineers directly.

Conclusion

A coating line is a comprehensive automated solution for protecting and decorating products in various industries. The choice of equipment should take into account the type of workpieces, required productivity, product dimensions, and operating conditions.

Guangdong Chuangzhi Intelligent Equipment Co., Ltd. (brand Attractivechina) has been developing and manufacturing custom coating lines since 2005: for auto parts, kitchenware, metal, wood, and industrial equipment. The company is a specialized innovative "Little Giant" enterprise and a high-tech enterprise, providing a full cycle of services from design to after-sales service.