In modern furniture production lines, the surface coating drying process plays a decisive role in product quality. With the widespread use of environmentally friendly UV coatings, PU paints, and NC paints, furniture paint dryer machines have become an indispensable part of coating equipment.
Among all drying equipment, one of the most critical core components is the lamp.
The lamp not only determines drying efficiency but also directly affects curing effect, surface gloss, and energy consumption.
With the widespread application of UV dryer machines (i.e., ultraviolet curing equipment) in the furniture industry, different types of lamps have begun to be extensively researched and used.
This article will systematically analyze the various types of lamps used in furniture paint dryer machines, their working principles, applicable scope, and advantages and disadvantages, helping you to fully understand this core topic.
Why do furniture paint dryer machines need different types of lamps?
The paint drying process in the furniture industry is not a single process. Different materials, different paint systems, and different surface requirements all determine the differences in drying methods.
1. Different coatings have different drying mechanisms
• Solvent-based paints (e.g., PU, NC paint): rely on heating to promote solvent evaporation;
• UV-cured paints: trigger photoinitiator reactions through UV light irradiation;
• Water-based paints: require low-temperature hot air or infrared-assisted drying.
Therefore, the type of lamp in a furniture paint dryer machine must be matched to the paint system; otherwise, problems such as incomplete curing, sticky surfaces, or discoloration may occur.
2. Lamp type determines energy form
During the drying process, the lamp is the core energy source. Different lamps emit energy in different forms:
• Some primarily emit heat radiation (e.g., infrared lamps);
• Some primarily emit ultraviolet light energy (e.g., UV lamps);
• Others achieve drying through a combination of light and heat.
Therefore, understanding the type of lamp is a prerequisite for correctly selecting a furniture paint dryer machine.
What are the common lamp types used in furniture paint dryers?
Furniture factories commonly use paint dryers, which can be categorized into hot air, infrared, and UV types. The corresponding lamps can be broadly classified as follows:
• Ultraviolet lamps (UV lamps)
• Infrared lamps (IR lamps)
• Halogen lamps
• Quartz heating tubes
• LED ultraviolet lamps (UV LEDs)
Among these, the lamps used in UV dryers are the most critical because they involve photochemical reactions, rather than simple thermal drying. We will now analyze the characteristics and applications of each type of lamp.
What types of lamps are used in UV dryers?
UV dryers in the furniture industry are mainly used for the rapid curing of UV paints, UV primers, and UV topcoats. The type of lamp directly affects the curing quality of the coating and production efficiency.
1. High-Pressure Mercury Lamp
This is the most traditional and widely used type of UV lamp.
Features:
• Wavelength concentrated around 365nm;
• High luminous intensity;
• Rapidly cures most UV coatings;
• Lower cost and strong equipment compatibility.
Advantages:
• Suitable for UV coatings on various wood-based panels;
• Strong light intensity and penetration;
• Mature and stable, easy to maintain.
Disadvantages:
• Generates some heat;
• Shorter lamp life (approximately 800–1000 hours);
• Not very heat-sensitive.
Therefore, high-pressure mercury lamps are widely used in standard UV dryer machines and are the primary light source for rapid curing of furniture panel surfaces.
2. Metal Halide Lamp
Metal halide lamps are composite light sources made by adding metal halides (such as iron, gallium, and indium) to mercury lamps.
Features:
• Wider emission spectrum, covering 365–450nm;
• Uniform energy distribution;
• High photochemical efficiency;
• More suitable for different types of UV paint systems.
Advantages:
• Increased curing speed;
• Reduced surface stickiness;
• Suitable for thick coatings and dark paints.
Disadvantages:
• Slightly higher cost;
• Complex spectrum, requiring a dedicated power supply.
Metal halide lamps are often used in high-end UV dryers, especially in furniture finishing processes, to achieve higher hardness and gloss.
3. Iron Lamps and Gallium Lamps (Fe Lamp / Ga Lamp)
In UV dryers, specific wavelength lamps are selected for different coating systems.
Iron (Fe) lamps: 380–420nm, strong deep curing capability, suitable for thick films and dark paints.
Gallium (Ga) lamps: 400–450nm, fast surface curing, high gloss, suitable for topcoats and glossy paints.
Mercury (Hg) lamps: 365nm, versatile, suitable for primers and intermediate coats.
In some furniture production line UV dryers, a combined lamp system is often used, namely a combination of "mercury lamp + gallium lamp + iron lamp" to achieve a balance between layered curing and surface gloss.
4. LED Ultraviolet Lamps (UV LED Lamps)
With the development of low-temperature curing technology, UV LED lamps have been gradually applied to modern furniture UV dryers.
Features:
• Concentrated emission wavelength (usually 365nm, 385nm, 395nm, or 405nm);
• Almost no infrared heat;
• Ready to use immediately, no preheating required;
• Long lifespan (up to 20,000 hours or more).
Advantages:
• Extremely low heat load, suitable for heat-sensitive panels;
• Low energy consumption;
• Stable light output;
• Mercury-free, more environmentally friendly.
Disadvantages:
• Higher initial investment cost;
• Requires a dedicated UV LED coating system;
• Concentrated light range, requiring a high-performance reflection system.
For high-gloss furniture, PVC decorative panels, acrylic panels, etc., UV LED dryer machines have become an ideal choice.
Besides UV lamps, what other light sources are used in furniture paint dryers?
Although UV dryers are the most mainstream, in the furniture industry, some traditional coating processes still rely on other photothermal lamps for drying.
1. Infrared Lamps (IR Lamps)
Infrared drying is mainly used in the evaporation stage of solvent-based and water-based paints.
Features:
• Transfers heat energy through infrared radiation;
• Uniform heating;
• Rapid heating and high efficiency.
Advantages:
• Suitable for drying thick coatings;
• Can be used with a UV dryer machine to achieve dual-stage drying (heat + light);
• Simple structure, easy to maintain.
Disadvantages:
• High heat output, may cause board deformation;
• Not suitable for UV-cured coatings.
Therefore, infrared lamps are mostly used in the "preheating zone" at the beginning of a UV dryer machine to help paint leveling.
2. Halogen Lamps
Halogen lamps are high-temperature radiation sources, with their spectrum mainly consisting of visible and near-infrared light.
Advantages:
• High light intensity;
• Good controllability;
• Low cost.
Disadvantages:
• Strong heat radiation;
• Not suitable for heat-sensitive boards;
• Short lifespan (approximately 500–800 hours).
On furniture coating lines, halogen lamps are often used for spot drying or rapid surface drying processes.
3. Quartz Heating Tube
A quartz heating tube is a resistance heating type light source, commonly used in hot air circulating dryers.
Features:
• Good thermal stability;
• Uniform heating;
• Robust structure.
It does not emit ultraviolet light, relying solely on heat for drying, making it suitable for the moisture or solvent evaporation stage of the primer layer.
Combinations of Different Lamp Tubes in Furniture Paint Dryer Machines
To balance efficiency and quality, modern furniture UV dryer machines often employ composite light source systems. Common combinations include:
1. Infrared + UV Mercury Lamp
Heating and leveling first, then UV curing.
2. Mercury Lamp + Gallium Lamp + Iron Lamp
Stage curing of the base layer, deep layer, and surface layer.
3. Infrared + UV LED
Suitable for PVC film and heat-sensitive plastic decorative panels.
4. Quartz Heating + UV Dryer Machine Combination
Evaporating solvent first, then UV curing, improving the density of the paint film.
This combination not only improves curing speed but also ensures the hardness, gloss, and adhesion of the furniture finish.
How does XMF Machinery help customers reduce production costs?
XMF Machinery helps customers reduce production costs by supplying efficient, automated, and durable equipment. Our roller coating machines and curtain coating machines are designed to minimize paint waste, while automatic spraying machines ensure controlled material usage. UV dryer machines reduce curing time and energy consumption. As a factory-direct manufacturer, we offer competitive prices without unnecessary intermediaries.