Low Migration UV Ink
Low-migration UV ink is a type of UV-curable ink specifically designed for packaging printing applications that require strict control over migration. By optimizing the formulation of resin systems, photoinitiators, monomers, and additives, the cured ink film exhibits low levels of migratable substance release.
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Product Introduction
Low-migration UV ink forms a stable, three-dimensional polymer network through a UV-curing reaction.
The specific process is as follows:
The ink is transferred onto the substrate surface via a flexographic press or other printing equipment.
A UV light source irradiates the ink layer.
Photoinitiators absorb ultraviolet light to generate free radicals.
Resins and reactive monomers undergo a polymerization reaction.
A cross-linked polymer structure is formed, reducing the proportion of unreacted components.
Key Technical Features
Low Migration Performance
Low-migration UV inks reduce migration risks by:
Selecting low-migration photoinitiator systems
Optimizing resin molecular structures
Increasing the degree of UV curing
Reducing volatile and extractable content
Suitable for applications requiring high standards of packaging safety.
Customization Options
FAQ:
What is required from the printing process to ensure low migration performance?
Even a low migration formulation can fail if the process is incorrect.
Key process conditions include:
Sufficient UV curing energy (lamp or LED intensity)
Correct wavelength matching (typically 365–405 nm system dependent)
Controlled ink film thickness
Proper anilox selection
Stable printing speed
Clean substrate surface (no contamination)
In most cases, under-curing is the main migration risk, not the ink itself.
For exporters, documentation is often as important as ink performance itself.
Can Low Migration UV Ink be used for direct food contact packaging?
It depends on the packaging structure.
Typical industry practice:
Indirect food contact (most common):
Ink is printed on outer layer (labels, films) separated from food by barrier layers.
Direct food contact (rare):
Requires strict formulation, migration testing, and full compliance validation.
Most buyers use it for:
Labels
Outer packaging films
Folding cartons with barrier structure
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