Application of Infrared Heating Tubes in Drying Water-Based Furniture Paint

Author:

xiaolanjing

In the furniture industry, water-based paint has a persistent pain point: its high moisture content. With conventional hot-air drying, the surface tends to skin over first, trapping water vapor inside the film — leading to blushing, pinholes, bubbling, after-tack, and sandpaper clogging during sanding. Infrared radiation heats the paint film and substrate from the inside out, allowing moisture to evaporate through the surface. The combination of infrared + hot-air dehumidification is therefore the mainstream solution in furniture factories. Since the substrates are mostly solid wood, MDF, or plywood — all sensitive to high-temperature deformation — short-wave high-temperature lamps must not be used for direct irradiation.

Recommended infrared heating tube: medium-wave carbon-fiber infrared heating tube with gold-plated reflector. The gold coating directs radiation toward the workpiece, reduces heat absorption by the oven cavity, and improves energy delivery to the paint surface.

I. Wavelength Selection

Water has a strong infrared absorption peak at approximately 2.9–3.0 μm. For water-based furniture paint, the first choice is therefore the medium-wave carbon-fiber infrared heating tube (peak wavelength 2.5–3.5 μm, with gold-plated reflector) — the optimal selection. It matches the absorption peaks of water and waterborne resins, delivering gentle heat; the gold reflector directs infrared energy toward the paint surface, reduces oven body heat absorption, and minimizes local hot spots on the substrate. It is suitable for panel furniture doors, cabinet panels, and veneer parts.

Short-wave halogen tubes, by contrast, reach extremely high instantaneous temperatures and can easily cause paint blistering, substrate carbonization, and wood yellowing. They are rarely used except on metal substrates and are not suitable for wooden furniture.

II. Power Density Selection

Taking a tunnel drying oven as an example, with an effective irradiated area of 3 m² and water-based white paint:

Total infrared power = 3 × 2.0 = 6.0 kW; select 6 pieces of 1000 W medium-wave gold-coated carbon-fiber tubes, divided into 2–3 independent PID power-regulation zones.

Per-tube selection:

Box-type drying room: 600–800 W
Tunnel production line: 800–1200 W

It is recommended to use multiple lower-wattage tubes arranged uniformly, rather than a few high-wattage tubes, to avoid local hot spots and paint blistering.

Linyi Blue Crystal Optoelectronics Technology Co., Ltd. designs photothermal energy drying systems installed at the downstream end of spray / curtain coating lines, based on the drying requirements of water-based furniture paint. The system adopts downward radiation + thermal convection to rapidly dry water-based paint. Once the workpiece enters the heating zone, a pre-set heating program controls each temperature zone independently, achieving the optimal temperature ramp curve for water-based paint and ensuring consistency across the dried surface. The rear section uses energy-concentrated heating, while residual heat from the front section is recirculated as hot air blown onto the water-based paint film — further improving drying efficiency and maximizing the utilization of the heating source.

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Differences in Wide-Format Fusing: Technical Requirements of Fuser Lamps in Wide-Format Engineering Printers