In brief
If a UV adhesive remains tacky or lacks durability, check wavelength match, delivered irradiance and dwell time before investigating oxygen inhibition and film transmission.
Dose depends on irradiance at the part and exposure time, not just the power number on a lamp
Dose depends on irradiance at the part and exposure time, not just the power number on a lamp. Web speed, lamp distance, dirty optics and resin thickness can change delivered energy. RadTech explains that wavelength, irradiance and energy density must meet the formulation's needs at the chosen process speed.
Tack can arise from insufficient dose, a mismatch between photoinitiator and lamp spectrum, excessive resin thickness or oxygen inhibition at the surface
Tack can arise from insufficient dose, a mismatch between photoinitiator and lamp spectrum, excessive resin thickness or oxygen inhibition at the surface. IST METZ describes oxygen inhibition in UV curing. Nitrogen inerting is not automatically required; first check the resin and lamp suppliers' process recommendations.
Build a controlled matrix: keep material fixed, then vary speed, distance and output one factor at a time
Build a controlled matrix: keep material fixed, then vary speed, distance and output one factor at a time. Measure surface tack, adhesion, abrasion and texture fidelity. Record radiometer model and measurement location so readings remain comparable.
The LICHAO sheet UV transfer machine uses an LED UV source but does not provide a universal cure recipe
The LICHAO sheet UV transfer machine uses an LED UV source but does not provide a universal cure recipe. Share resin data, target speed, film transmission and finished-part requirements before selecting equipment.
How do we start a trial?
Provide substrate, controlled artwork, material data, process flow and acceptance criteria. Use representative samples to confirm configuration and process window.
References and fact sources
Original process guidance. Verify equipment fit and performance with customer samples.
Mr. Yang can discuss a trial plan from your film, drawing and acceptance requirements.
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