Blister packaging ink additives should be selected after separating substrate wetting from process foam and heat-seal risk. CHLUMIWE® 2100 is the documented difficult-film wetting route. CHLUMIAF® 3062 is the documented printing-ink defoamer route. CHLUMIAG® 3501 is removed from the first shortlist because its public page gives no dosage or quantified blister-packaging rub, blocking or seal result.
No general additive page proves pharmaceutical, medical-device or food-contact compliance. Validate the exact ink layer, blister/lidding construction, seal process and market requirements.
Blister packaging ink decision map
| Observed failure | First evidence check | Route if confirmed |
|---|---|---|
| Ink beads or pulls back on foil, PET, PVC or coated lidding | Print side, treatment/coating, contamination, viscosity and film weight | 2100 wetting ladder |
| Foam follows mixing, pumping, chambering or return | Foam generation/decay, density and printed voids | 3062 defoamer ladder |
| Ink transfers, blocks or scuffs during forming/sealing | Drying/cure, residual solvent/water, stack and heat-seal conditions | Correct ink/process before surface additive |
| Seal weakens or package integrity changes | Ink location, sealant, temperature, pressure and dwell | Run full package validation |
| 제품 | Published fit | Supplier guidance | Boundary |
|---|---|---|---|
| 2100 | 100%-active modified polysiloxane; printing inks; PE/PP/PET wetting; water/UV/solvent | 0.1–1%; grind, stir or post-add | Avoid mixing; wetting does not prove seal or compliance |
| 3062 | 100%-active nonionic silicone defoamer; printing inks; water/UV/solvent | Printing inks 0.1–0.5% | Use only for measured air; solvent dilution needs stability/performance test |
| 3501 | Printing, overprint varnish and anti-sticking applications listed | Any-stage addition | No public recommended dose or blister-packaging endpoint |
Define the blister construction
Record printed substrate, foil or polymer grade, coatings/primers, print side, sealant layer, ink position relative to the seal, blister web and product contact. Include forming method and sterilization or aging exposures where applicable.
Use the production print process and control viscosity, pH where relevant, film weight, drying/UV dose and rewind or stacking. A laboratory drawdown cannot reproduce web tension, forming strain or sealing heat.
Use 2100 for confirmed wetting failure
2100 supports printing inks and difficult PE, PP and PET surfaces at 0.1–1%. Start low after treatment and cleanliness are verified. Measure coverage, edge definition, pinholes, color density, gloss and adhesion.
Then test rub, blocking, forming and sealing. Improved wetting can change surface energy and interlayer adhesion, so it is not automatically compatible with heat-seal lacquer, primer or overprint varnish.
Use 3062 only when foam is measured
3062 is a printing-ink defoamer, not a wetting or seal additive. Standardize mixing and circulation, then track foam height/decay, density and printed voids. Distinguish wet bubbles from dewetting and substrate outgassing.
Select the lowest passing level and inspect craters, gloss, color, adhesion and seal-area contamination. If solvent dilution is used, perform the supplier-required stability and defoaming checks.
Why 3501 is not a first recommendation
3501 lists printing and anti-sticking categories but provides no dose. It also has no quantified rub, block, heat-seal or blister-forming data. Obtain a current TDS and application-specific evidence before including it.
Measure rub and heat-seal performance
ASTM D5264 provides a Sutherland rub comparison for printed packaging. ASTM F2029 covers laboratory heat-seal preparation for flexible barrier materials and points to F88/F88M for seal-strength testing.
These methods do not replace package validation. Define seal temperature, pressure, dwell, cooling, specimen orientation and failure mode. Inspect ink transfer, delamination, channel leaks, distortion and appearance across the production sealing window.
Protect the heat-seal operating window
Do not compare one convenient seal setting. Establish low, nominal and high combinations of temperature, pressure and dwell that bracket production. For each condition, record average seal strength, variation and failure mode, not only whether the specimens remain closed. An additive that passes at the center but narrows the acceptable window creates manufacturing risk.
Where ink is outside the nominal seal area, still examine offset, migration through stacked layers, heat transfer and forming distortion. Where ink, primer or overprint varnish overlaps the seal, include that exact layer order and coat weight. Use unprinted and current-production controls to separate additive effects from sealant or equipment drift.
Run the complete package sequence
- Print production substrate at controlled film weight.
- Dry/cure, rewind or stack and condition.
- Form, fill or simulate product contact as permitted.
- Seal at low, target and high process conditions.
- Repeat rub, adhesion, seal and integrity checks after aging.
Keep compliance evidence product-specific
Request current declarations for the exact additive, use level, ink position and market. Do not infer migration, extractables, sterilization, recyclability or pharmacopeial compliance from an application list.
Scale from drawdown to press deliberately
At press scale, capture shear history, recirculation time, temperature, viscosity adjustment, filter pressure and foam return. Sample at startup and after sustained running. Compare color density, dot or edge definition, dry rate, blocking and residual odor across the roll. A drawdown win that requires continuous viscosity correction or produces delayed foam is not ready for packaging qualification.
Request a blister-ink shortlist
Send substrate/lidding construction, print and seal sides, ink chemistry, current additives, process conditions, drying/cure, rub/block data, forming/sealing window, failure photos and regulatory requirements. Ask Longchang Chemical to compare 2100 and 3062 for the measured printing failure.