Regarding the wavelength selection of Excimer Lamps for flooring surface treatment:
1.172 nm (Xe excimer) → Suitable for surface activation, increasing surface energy, improving coating adhesion, achieving matte surface effects, and enhancing scratch resistance.
2.254 nm (low-pressure mercury lamp or excimer variant) → Primarily used for sterilization, photolysis, and aging tests, but it is not ideal for precise surface micro-structuring.
Therefore, in UV / EB / Digital Printing flooring surface finishing systems,
172 nm is predominantly used, as it provides stronger micro-roughening and free radical formation on the surface, which significantly improves the bonding strength of ink / UV topcoat / EB coating and achieves a consistent matte texture.
1.Dielectric Barrier Discharge (DBD) is a discharge reaction that uses a quartz tube as the dielectric barrier and gas as the discharge medium.
2.Generates high-energy monochromatic and short-wave ultraviolet irradiance (up to 7.3 eV @ 172 nm under xenon gas).
1.Monochromatic irradiance: 172 nm under xenon gas, with a full width at half maximum (FWHM) of 14 nm
2.Power: 5 W/cm (current)
3.Adjustable power range: 30–100%
4.Efficiency: ~40%
5.Lamp length uniformity: >95%
6.Wavelength tunability: Other wavelengths achievable by changing the gas — 222 nm with KrCl, 308 nm with XeCl
7.Available lamp lengths: 120–2300 mm
1.Other technologies for generating ultraviolet irradiation
2.Low power (factor >10)
3.High efficiency (40%)
4.Monochromatic irradiation
5.Requires additional cooling methods
6.Requires inert gas (ozone)
7.May have different applications
– Overview of the Principle of Excimer UV Cleaning Process
1.Inert Version
2.Detection and control of ozone concentration
3.Residual oxygen concentration about 100–2000 ppm
4.Extraction of active gases (ozone)
1.The excimer (172 nm) generates ozone and active oxygen, which break the chemical bonds between organic molecules on the material surface.
2.This causes changes in the material properties — improving adhesion, hydrophilicity, and other effects, or enabling new functionalities.
Advantages of Excimer Light Technology in Surface Cleaning Processes：
1.Compared with plasma/corona discharge treatment, the product surface has no discharge damage.
2.Compared with plasma/corona discharge treatment, no dust contamination is generated on the surface.
3.Compared with plasma treatment, the surface shows no uneven treatment areas.
1.Under the high-energy excimer irradiation at 172 nm (7.3 eV), the coating surface undergoes a curing reaction. The upper layer of the coating shrinks and forms a microfolded film, resulting in a matte effect.
2.The matte surface layer is located on top of the uncured coating and requires subsequent UV light exposure for complete curing.
Advantages of excimer UV technology in coating matting：
1.Compared with traditional matte coatings, it offers excellent chemical and mechanical resistance.
2.It can achieve ultra-matte effects (below 2 GU @ 60˚).
3.No need for special paints containing matting agents — during production, switching between high gloss and matte finishes can be achieved without changing the coating, resulting in higher productivity.
1.Suitable for both indoor and outdoor applications (such as flooring, furniture, façades, engineering plastics, etc.) for matte finishing on coated surfaces (PVC, other foils/films, wood, parquet flooring, etc.).
2.Residual oxygen can be measured and controlled online.
3.Residual oxygen concentration is controlled at approximately 300 ppm.
| Feature | Nitrogen UV | Non-Nitrogen UV |
| Emission Principle | Uses xenon DBD discharge under nitrogen protection to generate excimer radiation. |
Uses mercury or LED UV curing directly in air. |
| Wavelength & Energy | 172 nm (7.3 eV), high-energy photons break chemical links | 254 nm (4.9 eV), medium-energy photons for surface curing only. Low energy can cause bright spots at floor joints. |
| Curing Environment | Requires inert nitrogen (<300 ppm O₂), high energy density. | Cures in air, no nitrogen required. |
| Surface Effect | Dense, oxidation-free surface with high-gloss or ultra-matte finish. | Slightly rough surface, limited gloss control. |
| Matting Method | Microfolding induced by high-energy light. | Requires matting agents or formulation adjustment |
| Maintenance & Cost | Higher cost, complex setup, nitrogen required. | Low cost, simple structure, easy maintenance |
| Application | High-end PETG/LVT films, decorative coatings, EB alternatives. | PVC/SPC flooring, general coatings, print protection. |
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StarsPlas is a fully automatic equipment research and development company focusing on green building materials.
Our company is committed to providing industry 4.0 automation production solutions in accordance with European and American standards.
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