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Powder Coating Curing Oven

 
Why Choose Us?
 
01/

Rich Experience
Qingdao JOBON Science & Tech Development Co., Ltd, started from 1999 for the designing and manufacturing of powder coating machinery. The company has two worldwide brands: JOBON, PENTOO.

02/

Wide range of applications
Powder coating equipment can be widely used for all industries, ranging from small car repair shops to busy high automation factories.

03/

Quality Guaranteed
JOBON Company is continuously taking the leading role in the industry of powder coating and enamel coating equipment and solution. And our JOBON people is keeping hard working toward our expectation: technology makes spraying more perfect.

04/

Professional technical team
JOBON Company has been dedicated to the powder coating equipment manufacturing field, focusing on research and design. With more than 20years developing time, the company has accumulated 62 patents, and has been awarded as High Tech Enterprise from 2013 and was selected into the provincial "specialized, fined, peculiar and new area" enterprises list in 2020.

 

Definition of Powder Coating Curing Oven

Powder coating curing ovens are used to cure powder previously applied to a substrate, usually metal parts. Unlike conventional liquid paints, powder coatings consist of small particles of solid material. Because of their different characteristics, wet paint and powder coatings have different curing requirements.

 

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Benefits of Powder Coating Curing Oven
 

Solvent-Free Surface Protection
Powder coating curing ovens project a free-flowing stream of charged powder particles onto a substrate prior to curing at relatively low temperatures (>200°C). This powder stream is dry and solvent-free, ensuring compliance with Environmental Protection Agency (EPA) regulations regarding the emission of Volatile Organic Compounds (VOCs).

Thicker Uniform Coatings
An additional drawback of liquid coating is the tendency towards aesthetic and topographical flaws with thicker coatings. powder coating curing ovens generally use electrostatic methods to ensure optimal bonding between powder particles and the metallic substrate. In spray painting, only the bottom layer of paint readily attaches to the substrate which can cause subsequent layers to run or sag. This issue is eliminated in powder coating.

Improved Optical Regularity
Paint often exhibits optical variations depending on the direction of application. By comparison, powder coating curing ovens typically impart little to no visual differences between vertical and horizontal planes of application. This ensures the highest optical uniformity for commercial coatings with good gloss and color retention.

Specialty Capabilities
Liquid coatings are extremely limited in terms of their functionalities. As well as providing a corrosion-resistant synthetic skin, powder coatings can be engineered for a range of additional capabilities. Depending on the chemistry of the applied powders, electrostatic coatings can improve the mechanical and chemical performance of the substrate, while providing good electrical insulation capabilities.

Higher Throughput
Powder coating curing ovens typically require significantly decreased curing times to the drying periods of liquid paints. It also eschews the mandatory preparatory stages of paint preparation such as mixing and thinning. This demonstrates significant cost-savings in high throughput manufacturing environments.

 

Bridge Type Powder Coating Curing Oven

 

Components of a Powder Coating Curing Oven

A powder coating curing oven typically consists of the following components:
Heating elements: These elements are responsible for generating the heat that is needed to cure the powder coating. The type of heating elements used can vary, but the most common type is electric resistance heaters.
Temperature control system: This system ensures that the oven maintains a consistent temperature throughout the curing process. It typically consists of a thermostat and a temperature controller.
Airflow system: This system provides even air circulation throughout the oven, which helps to ensure that the powder coating cures uniformly.
Door seals: These seals provide a tight seal around the door of the oven, which helps to prevent heat loss and maintain the controlled environment.
Support racks: These racks are used to hold the coated items during the curing process.

 

How Long Does It Take for Powder Coating Curing Oven to Cure?

 

 

Powder coated items do not dry like traditional paint.
Once an item is prepped (abrasive blasted then treated with a metal prep solution) it is then placed into one of our ovens.
When the item reaches its target temperature, the powder flows out and generally cured in 15-30 minutes.
Once the item is out of the oven and cooled, it can be put immediately back into service.

 

Powder Coating Curing Oven: The Basics of Powder Curing

 

When powder particles are heated, they melt and flow together. This creates a uniform, bonded finish once it has cooled. Typically, the finished coating is 2 to 4 mils thick. Thicker coatings are possible and are often created by applying multiple layers of powder. All ovens used for powder coating operate at elevated temperatures and rely on some type of heating system. Regardless of the technology used, powder coating curing ovens heat the surface of the parts being coated, usually to about 400° F.

 

At higher temperatures, the time required to cure parts will be less than at lower temperatures. These tables are based on the assumption that the entire area to be coated has reached the desired temperature and will maintain it for the duration of the curing process. When curing the powder, only the surface of the part it was applied to has to reach and maintain the curing temperature. Because of the way it acts as a heat sink and absorbs heat energy, a large, dense part, like an agricultural implement, will take longer to cure than a small, thin part, such as a sheet metal trim piece, because it will require more time to get the surface of the part to the appropriate temperature.

 

 

Powder Coating Curing Oven: Solvent Cure Test

Powder coatings start as a powder that manufactures heat to create a durable, smooth and uniform finish. Professional powder coaters must use the correct temperature and cure time to achieve sufficient adhesion and maximum durability. You can perform a solvent cure test to test how well the powder coating has cured.

 

This test involves rubbing a cotton swab soaked in methyl ethyl ketone 25 times over the cured coating. Then, you can assess the cotton and coating for signs of degradation. A bit of rubbed-off color or gloss is fine, but the coating fails the test if too much coating rubs off or you see the metal underneath.

Diesel Heating Powder Coating Curing Oven

 

What Is the Ideal Powder Coating Curing Oven Temperature?

 

 

Understanding the powder coating process is essential to know how the ideal temperature is determined. The process begins by removing any dirt or grease from the surface of the metal. The most common types of powder coating used are either thermoplastic or a thermoset polymer. They differ in their ability to bond with the base material for powder coating.

 

The metal surface is heated first before spraying the powder coating onto it. The process of spraying is the recommended application to ensure a uniform finish. The final step is exposing the metal to high temperatures to strengthen the coated finish bond.

 

The typical temperature for heating powder coating is 200 degrees celsius (or 390 degrees fahrenheit). The heating process lasts for 10-15 minutes. The actual powder coating curing oven temperature used will vary based on numerous factors such as the manufacturer's specifications, the size and mass of the object, and the thickness of the coating. These factors must be taken into account to ensure the appropriate temperature is used and that the powder coating will last for several years.

 

6 Easy-to-Follow Powder Coating Curing Oven Buying Tips
 

If planning to buy a powder coating curing oven, you can proceed in the following ways: 

1

Basic questions: What products you are going to powder coat? Who are your targeted customers? How many parts do you wish to complete in a day? What types of colors will you use? What is the maximum length and breadth of pieces to be powder coated? Answering these questions will help you get an idea about your requirement.

2

Size of the oven needed: Your productivity will be determined by the size of oven you purchase. However, a small oven may help you save money, it may limit your productivity as well. Hence, after identifying your target market, it is very important to concentrate on the size of the oven.

3

Technologies: The powder coating curing ovens are available in conventional and infrared technologies. The infrared ovens are electric or gas infrared driven. Hence, while selecting the right oven you need to consider benefits of each type. For an appropriate judgement, you can always talk to the powder coating furnace supplier or manufacturer to learn about benefits of their product.

4

Air velocities strength: If you have decided to buy a conventional oven, ensure that air velocities aren't very strong. This is because the extremely strong velocities will blow powder off parts, and make them touch each other while stored. It is always recommended to select powder curing ovens with maximum velocity- 3m/s.

5

Certification: This aspect ensures that the powder coating curing oven you wish to purchase is of certain required quality. Most ovens sold in the US are either CSA or UL certified, or they may meet NFPA (National Fire Protection Association) code 86 specifications.

6

Controllers: Powder coating curing ovens are equipped with digital or analog controllers. These controllers help adjust precise temperatures. Digital controllers allow control over heat. The powder curing ovens are user-friendly, and can be easily adjusted with a push of a button.

 

Our Factory
 

Qingdao JOBON Science & Tech Development Co., Ltd, started from 1999 for the designing and manufacturing of powder coating machinery. The company has two worldwide brands: JOBON, PENTOO.
JOBON Company has been dedicated to the powder coating equipment manufacturing field, focusing on research and design. With more than 20years developing time, the company has accumulated 62 patents, and has been awarded as High Tech Enterprise from 2013 and was selected into the provincial "specialized, fined, peculiar and new area" enterprises list in 2020.
JOBON Company is continuously taking the leading role in the industry of powder coating and enamel coating equipment and solution. And our JOBON people is keeping hard working toward our expectation: technology makes spraying more perfect.
Powder coating equipment can be widely used for all industries, ranging from small car repair shops to busy high automation factories. It can be used for perfect metal surface powder coating of different types of products: auto parts, wheels, LED radiator, heating radiator, air conditioner housing, washing machine cabinet, water heater tank, kitchen appliance, BBQ grill, extinguisher box, electrical cabinet, industrial shelf, fitness equipment, aluminum profile, security door, steel pipe, gate, fence, cylinder, water meter, air compressor tank, gas tank etc.

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Main Products Development History
 

In 2004, the first generation of electrostatic powder coating machine PF-01A was launched.
In 2004, the high-voltage built-in PF-02K electrostatic powder coating machine was launched.
In 2005, MA3300 high-voltage built-in electrostatic powder coating machine was put on the market.
In 2011, MA3300D digital control electrostatic powder coating machine was launched.
In 2018, the S10 series touch screen electrostatic powder coating machine is launched.
In 2020, M2 digital control electrostatic powder coating machine is launched.
In 2021, the S20 series touch screen electrostatic powder coating machine is launched.

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Our Certificate
 

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Ultimate FAQ Guide to Powder Coating Curing Oven
 

 

Q: How long do you leave powder coat in powder coating curing oven?

A: The curing process for powder coating is normally done in a special powder coating curing oven; the coating has to be exposed to a temperature range of 350 to 400 degrees Fahrenheit (160 to 210 degrees Celsius) for 20 minutes. When melting the more common thermosetting powder, it bonds chemically to form a hard, permanent layer of paint.

Q: Powder coating curing oven: What causes orange peel in powder coating?

A: Generally speaking, when the proportion of powder with particle size greater than 75 μm is too much, it will cause the leveling performance of the powder-coated film to deteriorate and easily produce the orange peel phenomenon. At the same time reduce the powder unit spraying area, and in the construction process, the electrostatic effect of the powder coating becomes worse, easy to cause the powder off.

Q: Powder coating curing oven: What happens if you over cure powder coat?

A: Overbake is the result of curing powder coat at too high of a combination of time and/or temperature. The film often becomes too hard and may embrittle also causing the gloss level or color to be adversely affected. Many powders have overbake for time protection built-in allowing a powder to cure double the allotted cure time. This is especially important for curing substrates with varying thickness. Overbake protection does not apply for too high of temperature.

Q: Powder coating curing oven: Can I do powder coating myself?

A: You need a sprayer, a powder coating curing oven, metal cleaner, powder pigment, a power source, an electrical transformer and attachments for your powder coat sprayer. You need to set aside enough time to prepare your workspace, pre-treat the component, apply the powder coat and allow the powder to cure and set.

Q: What powers powder coating curing ovens?

A: The most common powder coating curing oven designs rely on natural gas fuel to power their heat systems. In rural areas, liquid propane (lp) gas may be used instead. Although electric heating can be used, it isn't practical for most batch or constant process ovens used in a production environment. Ovens larger than about 6' x 6' x 10' are almost always heated by gas fuel.

Q: How do powder coating curing ovens heat the parts?

A: Convection or radiant heat. Most curing ovens on the market rely on forced convection to heat parts placed inside them. Convection is usually the dominant form of heat transfer in gases, such as the air circulating inside a powder curing oven. Convection (or convective heat transfer) is the transfer of heat from one place to another inside the oven due to air movement.

Q: Can you use a powder coating curing oven to cure powder coating?

A: Convection ovens use convection heat, transferred through the air, to increase the temperature of the oven and the product surface. Curing in a convection oven starts on the outside of the product and works in. This outside-in method means it takes longer to cure the powder coating than it would with infrared.

Q: Is it safe to cure powder coat in powder coating curing oven?

A: Expensive Equipment and Supplies. Probably the most problematic part is the curing oven. You should NOT use a kitchen oven or microwave to cure parts because the toxic gases emitted will contaminate food, even after a thorough cleaning. As buying commercial ovens is expensive, most people opt to buy a special curing oven or build a DIY version. Even then, finding one that is large enough for most household parts such as furniture or landscaping features will be difficult

Q: Does a powder coating curing oven need to be vented?

A: Yes, a powder coating curing oven typically requires a vent to operate properly and to maintain a safe working environment.

Q: What temperature is powder coating curing oven?

A: Historically, most powder coating chemistries required relatively high curing temperatures ranging from 350–400°F (177–204°C) for 5–20 minutes (substrate temperature). Lower-temperature curing chemistries emerged in the 1990s and are becoming commonplace. The following will present compelling reasons for the use of low-temperature-cure powders and identify which end uses can benefit with their use.

Q: What is the best insulation for a powder coating curing oven?

A: The most common choices of insulation for a powder coating curing oven are mineral wool or fiberglass. Mineral wool insulation, also referred to by the brand name Rockwool, has a higher temperature rating than fiberglass (~2000°F vs ~1000°F), is more durable, easier to work with, and usually comes at a higher price. The R-value for 3.5" mineral wool insulation is R15, while the R-value for 3.5" fiberglass ranges from R11 to R15.

Q: Powder coating curing oven: Should you preheat before powder coating?

A: For the out-gassing, we usually pre heat the parts. The idea is to heat the items to a temp HIGHER than what the cure temp is before we coat them. That way, while we apply the powder and send them in to cure, they are actually cooling from around 425F to 390F, which will have the effect of pulling the coating in to the parts rather than have the gasses pushing out.

Q: How many heating elements do I need for a powder coating curing oven?

A: Multiple SSR's or contactors can be used depending on how many total watts are required for your heating elements. This oven build uses 2 contactors, each one operating 2 heating elements, totaling 4 heating elements. If using a solid state relay, it is very important to order a high quality unit or read reviews about the specific item you are ordering as there are many knock-off's out there that burn up quickly.

Q: Powder coating curing oven: Will powder coat cure at 200 degrees?

A: Coating heat sensitive substrates such as engineered boards (e.g., medium density fiberboard—MDF), plastics and light alloys may require the use of ultra-low cure powder coatings. These are products that can cure at temperatures from 200°F to 275°F.

Q: Powder coating curing oven: How hot is too hot for powder coating?

A: Traditional non-high temp powder coatings can withstand up to about 250°F and occasional spikes in temp up to about 350°F - 400°F. Our experience has shown high temperature powder coatings to be troublesome to spray, have poor longevity, and overall durability.

Q: Powder coating curing oven:How long does it take for powder coating to dry?

A: Powder coated items do not dry like traditional paint. Once an item is prepped (abrasive blasted then treated with a metal prep solution) it is then placed into one of powder coating curing ovens. When the item reaches its target temperature, the powder flows out and generally cured in 15-30 minutes.

Q: Powder coating curing oven: What happens if you leave powder coat in oven too long?

A: Over-baked powder coating can become brittle and flaky. Some discoloration could also result from over-baking. On the flip side, you should beware of under-baking the powder coat as it powder coating curing oven't adhere properly and will make the metal or object that is powder-coated vulnerable to corrosion.

Q: Powder coating curing oven: Can powder coating be done twice?

A: Can You Put a Second Coat on Powder Coating? Put simply, the answer – most of the time – is yes. There's nothing about powder coating that makes the material fundamentally incompatible with more powder coating. You can have the powder applied and cured to form a new coating that looks just like new, in most cases.

Q: Powder coating curing oven: Can you overbake powder coat?

A: Overbake is the result of curing powder coat at too high of a combination of time and/or temperature. The film often becomes too hard and may embrittle also causing the gloss level or color to be adversely affected. Many powders have overbake for time protection built-in allowing a powder to cure double the allotted cure time.

Q: Powder coating curing oven: What is the minimum temperature for powder coating?

A: This lowest feasible cure temperature for this chemistry is at least 325°F (163°C), which may reduce energy needed to cure the coating but doesn't avail itself for application to most heat-sensitive substrates.

As one of the leading powder coating curing oven manufacturers and suppliers in China, we warmly welcome you to buy high-grade powder coating curing oven for sale here from our factory. All our products are with high quality and competitive price.

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