company news about 365nm vs 385nm vs 395nm: Which wavelength is best suited for your curing process?

1. Core Differences: Surface Curing vs. Deep Penetration

To understand wavelength selection, we must first understand the performance of UV energy in coatings.

Short wavelengths (365nm): Carry higher photon energy. They are easily absorbed by material surfaces, making them the king of surface curing. They quickly eliminate the tack-free feel of surfaces, resulting in a high-gloss coating.

Long wavelengths (385nm/395nm): Lower energy but stronger penetrating power. They easily penetrate thicker or highly pigmented ink layers, reaching the bottom and ensuring deep adhesion (Through Curing).

2. Detailed Analysis of Three Mainstream Wavelengths

3. How to Make the Final Choice for Your Process?

Before deciding to purchase a UV LED curing lamp, check the following three dimensions:

1. For coating thickness > 50μm, choose 395nm to ensure bottom curing and prevent peeling.
2. For coating color (dark/high opacity), choose 395nm; the longer wavelength can "bypass" pigment particles.
3. For high transparency/anti-yellowing requirements, choose 365nm; the concentrated energy reduces the long-wave heat effect on the substrate.
4. For high surface hardness/scratch resistance requirements, choose 365nm for rapid cross-linking of surface molecules.

In some complex industrial scenarios, a single wavelength may not be sufficient to perfectly solve the problem. For example, in high-speed label printing, we often recommend a hybrid approach of "365nm + 395nm": using 365nm for surface drying and 395nm to ensure strong adhesion between the ink and the substrate.

The choice of wavelength depends not only on the lamp but also on your photoinitiator formulation. Before placing an order, please consult your ink supplier or contact our technical team for mixing tests.