Building a new coating factory.
Adding a coating line to an existing factory.
Relocating coating equipment.
Adding booths or curing ovens to meet increased production.

When such planning begins, discussions often start with equipment.

How many meters of coating booth space are needed?
What temperature in °C can the curing oven reach?
At what speed in m/min does the conveyor run?
Which pretreatment system should be used?
Manual spraying or automatic coating?
Powder coating or solvent-based coating?
What exhaust fan capacity is needed?

Equipment specifications are, of course, important.
However, the first consideration in coating factory planning is not where to place equipment.

The first consideration is flow.

Where do untreated products enter?
How do pretreated workpieces move to the coating process?
After coating, how do they move through drying, baking, cooling, inspection, packing, and shipment?
Where are paint and thinner supplied from?
Where do operators walk?
Where do forklifts and carts travel?
Where are waste paint and waste thinner taken?
In which direction do exhaust and odors leave?

Coating factory planning is more than arranging equipment.
It means designing the flow of workpieces, people, paint, air, hazardous materials, waste, and vehicles.

1. A Coating Factory Is More Than a Place to Apply Paint

A coating factory is not simply a place where paint is applied to products.

A coating factory contains various processes.

• Workpiece receiving
• Surface preparation
• Water removal and drying
• Pre-coating checks
• Paint mixing
• Coating
• Flash-off
• Drying and baking
• Cooling
• Inspection
• Repair
• Packing
• Shipment
• Waste collection

Equipment and locations that support these processes are also needed.

Paint storage.
Mixing rooms.
Hazardous material storage.
Fixture storage.
Cart storage.
Cleaning areas.
Waste thinner storage.
Used filter storage.
Inspection areas.
Areas for defective products.
Areas for rework.
Maintenance space.

Placing only the main equipment without considering these needs inevitably creates difficulties on the shop floor later.

The equipment has been installed.
However, there is nowhere to stage workpieces.
Operators walk long distances.
Paint is far away, so temporary storage on the shop floor increases.
Forklift and operator routes cross.
Inspection areas are dark.
Areas around curing ovens are hot.
Waste storage is added as an afterthought.

Under these conditions, the coating factory will not operate stably even if equipment capacity is sufficient.

2. Decide Workpiece Flow Before Placing Equipment

Workpiece flow is the most important consideration in coating factory planning.

Untreated products enter.
They are pretreated.
They are coated.
They are dried and baked.
They are cooled.
They are inspected.
They leave as finished products.

The more naturally these steps connect, the easier it is to maintain stable operations.

Conversely, the following flow patterns cause problems.

• Routes for untreated and finished products cross
• Workpieces wait a long time after pretreatment
• Products awaiting coating pass through dusty areas
• Coated products are placed in aisles
• Defective and acceptable product areas are close together
• The return route for rework is not defined
• Workpieces repeatedly backtrack
• Loading and unloading areas become congested

Coating quality is not determined only at the moment of application.

Contamination of workpieces before coating leads to foreign matter defects and poor adhesion.
Long waits after pretreatment create risks of renewed rusting and contamination.
Placing coated products in cramped areas causes scratches and contact damage.
Unclear rework flow leads to incorrect loading and missed inspections.

Workpiece flow is itself quality management.

3. Do Not Underestimate the Distance from Pretreatment to Coating

The relative locations of pretreatment and coating are extremely important in a coating factory.

Pretreatment prepares the surface before coating.
Degreasing, cleaning, conversion treatment, rinsing, and drying produce a surface suitable for coating.

However, if a pretreated workpiece becomes dirty before coating, the benefit of pretreatment is reduced.

Examples include the following conditions.

• Long-distance movement after pretreatment
• Passing through dusty aisles
• Passing through areas where forklifts travel
• Passing near entrances where outdoor air readily enters
• No clearly defined staging area after pretreatment
• Long waiting times before coating
• Waiting in humid areas

These conditions increase the risks of renewed contamination, renewed rusting, debris deposition, and poor adhesion.

The route from pretreatment to coating should ideally be as short, clean, and easy to manage as possible.
If a long route is unavoidable, covers, staging area management, waiting-time management, cleaning, and conveyance rules are needed.

Coating factory planning must not consider pretreatment equipment and coating booths separately.
The flow from pretreatment to coating needs to be designed as a single quality-controlled section.

4. Do Not Leave Operator Flow Until Later

Factory planning tends to focus on equipment and workpiece flow.
However, operator flow is equally important.

Operators perform many movements within a coating factory.

Fetching paint.
Fetching thinner.
Preparing fixtures.
Hanging workpieces.
Coating.
Cleaning guns.
Inspecting.
Returning defective products.
Transporting waste.
Writing records.
Reporting to managers.

Poor routes for these movements increase operator burden.

Operators repeatedly walk long distances.
They carry heavy paint cans over long distances.
They pass carts in narrow aisles.
They work for long periods near hot ovens.
They move around coated products.
They walk in the same aisles as forklifts.

These conditions reduce both work efficiency and safety.

A good coating factory plan allows operators to move clearly, comfortably, and safely.
Equipment needs to be arranged so people can work safely, rather than forcing people to adapt through excessive effort.

5. Design the Flow of Paint, Thinner, and Auxiliary Materials

Materials move through a coating factory as well as workpieces.

Paint.
Thinner.
Curing agents.
Pretreatment agents.
Cleaning agents.
Masking materials.
Wiping cloths.
Filters.
Fixtures.
Tools.
Empty cans.
Waste thinner.
Waste paint.

Placing equipment without considering these flows makes the shop floor prone to disorder.

For example, distant paint storage increases the time operators spend fetching the required paint.
This may lead to temporary paint storage near the work area.

If the mixing room is inconveniently located, operators may want to mix paint near the booth.
However, temporary storage of paint and thinner and improper mixing create fire prevention, quality, and 5S problems.

If waste thinner storage is far away, waste liquid after cleaning is temporarily left on the shop floor.
Unclear locations for used filters and dirty wiping cloths make the work area prone to contamination.

Coating factory planning must also design material entry and exit routes.

6. Design Hazardous Material Flow as Part of Safety Planning

Coating factories may handle materials with fire or health risks, such as paint, thinner, curing agents, and cleaning agents.

Hazardous material flow must therefore not be decided solely by work efficiency.
It needs to be designed as part of safety planning.

Items to check are as follows.

• Hazardous material storage location
• Mixing room location
• Distance from booths
• Distance from curing and baking ovens
• Distance from flames and high-temperature equipment
• Ventilation
• Temporary storage quantities
• Transport routes
• Fire suppression equipment
• Evacuation routes
• Waste thinner storage
• Empty can storage
• Compliance with regulations and fire safety requirements

Hazardous materials cannot simply be placed wherever work is convenient.
However, placing them too far away encourages temporary storage on the shop floor.

What matters is a layout that allows safe proximity, easy management, and convenient work.

Coating factory planning needs to define from the outset where hazardous materials will be stored, how they will be used, and where they will be returned.

7. Without Airflow Planning, Dust, Odors, and Heat Become Problems

Airflow is also important in a coating factory.

Coating booths discharge paint mist and odors.
Curing and baking ovens generate hot air.
Pretreatment processes may generate moisture.
Nearby grinding or machining processes generate dust.

Poor airflow causes the following problems.

• Debris and dirt inclusion defects increase
• Dust enters with outdoor air
• Odors remain in work areas
• Solvent vapor stagnates
• Heat builds up in work areas
• Moisture affects coating quality
• Operator workload increases

Looking only at booths is not enough in a coating factory.
Check supply air, exhaust, entrances, windows, wind direction, and the relative locations of preceding and subsequent processes throughout the building.

In particular, dust in areas where workpieces pass before coating causes quality defects.
Hot air from curing ovens spreading into work areas increases operator fatigue and air-conditioning load.
Moisture from pretreatment flowing into the coating area may affect coating quality.

Airflow is difficult to see, but has a major effect on coating quality and the working environment.

8. Plan the Flow of Vehicles, Carts, and Forklifts Too

Carts and forklifts are used to transport workpieces and materials in coating factories.

Disorganized vehicle routes create safety problems.

Operator and forklift routes cross.
Carts pass each other in narrow aisles.
Forklifts travel close to coated products.
Untreated products pile up near delivery entrances.
Outbound finished products conflict with incoming materials.
Workpieces are temporarily placed in aisles.

These conditions cause quality defects as well as accidents.

Forklift traffic may stir up dust.
Carts contacting workpieces cause scratches and dents.
Congested aisles disrupt first-in, first-out management.

Coating factory planning should separate pedestrian and vehicle routes as far as possible.
Where crossings are unavoidable, define intersections, stopping positions, signs, mirrors, and traffic rules clearly.

9. Create a Flow for Inspection Results to Return to the Process

Inspection process location is also important in a coating factory.

Inspection does more than identify defective products.
It provides information for prompt process correction.

For example, suppose inspection identifies the following problems.

Many dirt inclusions.
Sagging.
Insufficient film thickness.
Low gloss.
Color mismatch.
Suspected insufficient drying.
Many scratches.

If this information does not return promptly to the coating process, the shop floor may continue producing the same defects.

Inspection areas therefore need to be designed with their distance from the coating process and information communication methods in mind.

The inspection area is too far away.
Inspection results are recorded late.
There are no rules for informing the shop floor.
It is not defined who stops production when defects occur.
The rework return route is unclear.

Under these conditions, inspection becomes merely an acceptance decision at the exit.

Coating factory planning also needs to design the flow of inspection results back to the process.

10. Without Planned Staging Areas, the Shop Floor Uses Aisles for Storage

Staging and storage areas are easily overlooked in coating factory planning.

Equipment drawings show booths, ovens, conveyors, and pretreatment equipment.
However, they sometimes do not adequately show the staging and storage areas actually needed on the shop floor.

Required areas include the following.

• Untreated product staging
• Pretreated product staging
• Pre-coating product staging
• Post-coating product staging
• Cooling waiting area
• Inspection waiting area
• Finished product storage
• Defective product area
• Rework area
• Fixture storage
• Cart storage
• Temporary paint storage
• Temporary waste storage

When these areas are insufficient, the shop floor uses aisles for storage.

Workpieces are placed in aisles.
Paint cans are placed beside booths.
Finished products accumulate at curing oven exits.
Defective products are placed near acceptable products.
Fixtures are placed on the floor.
Waste is temporarily left in work areas.

These conditions look like a 5S problem.
However, they are often actually a layout design problem.

A good factory plan includes necessary staging and storage areas from the beginning.

11. Leave Room for Future Changes

A coating factory is not finished once it has been built.

Customer requirements change.
Production volume increases.
Product varieties increase.
The number of colors increases.
Environmental regulations change.
Automation becomes necessary.
Conversion to powder coating or waterborne coating is considered.
New inspection processes become necessary.

Coating factories experience future changes like these.

Using all available space in the initial plan makes later changes difficult.
Aisles are narrow.
There is no expansion space.
Exhaust ducts cannot be added.
Paint storage is insufficient.
Inspection areas cannot be expanded.
Curing ovens cannot be lengthened.
Automated equipment cannot be added.

Such conditions greatly increase future improvement costs.

Coating factory planning needs to consider future changes as well as current production.
They cannot be predicted perfectly, but room can be left to make changes easier.

12. CoatureVietnam’s Approach to Factory Planning

CoatureVietnam believes coating factory planning should not begin with equipment selection.

The first checks are what the customer makes, how products move, what quality is required, and what working environment is intended.

The following flows are then organized.

• Workpiece flow
• Operator flow
• Paint and thinner flow
• Fixture and cart flow
• Air and exhaust flow
• Hazardous material flow
• Waste flow
• Inspection information flow
• Vehicle and logistics flow

Equipment layout is considered after these flows have been organized.

Assess whether the shop floor will operate safely, comfortably, and consistently, rather than simply whether equipment will fit.
This is the basis of coating factory planning.

Summary

Coating factory planning is more than deciding where equipment will be placed.

How do workpieces flow from untreated products to finished products?
Can operators move safely?
Can paint and thinner be supplied safely?
How do air, dust, odors, and heat move?
Can hazardous materials be stored and used safely?
Do inspection results return to the process?
Can waste be collected properly?
Can future changes be accommodated?

A coating factory becomes stable only after these matters have been designed.

Even high equipment capacity cannot prevent bottlenecks if flow is poor.
Conversely, good flow allows equipment capacity to be used more effectively.

CoatureVietnam views a coating factory as a collection of flows, rather than isolated equipment.
By organizing the flow of materials, people, paint, air, hazardous materials, waste, and information, it aims to improve quality, safety, productivity, and the working environment.

Coating the Future with Science and Care.
Coating factory planning is an important process that gives this principle practical form from the beginning.