Gravure is the dominant print method for cigarette packaging — thick ink films, saturated colors, that unmistakable depth. But it comes with a long list of ways things can go wrong. Blocking, pinholes, ghosting, color drift, foaming, plate blinding — the list is long enough that even experienced operators run into surprises.
Here are the 17 most common gravure defects in cigarette pack printing, what causes each one, and what actually fixes them on the production floor.
1. Blocking (Plugging)
What you see: Small text or fine patterns won’t print. In severe cases, a visible ink smear sits on the plate.
Causes:
- Ink drying too fast, solidifying inside engraving cells
- Press speed too slow
- Poor cylinder engraving
Fix: Add slow-drying solvent to the ink. Increase press speed. If it keeps happening, re-engrave the cylinder.
2. Pinholes
What you see: Tiny holes appear in printed areas, especially large solid coverage. Two types:
Mechanical pinholes: The ink layer becomes a thin, transparent film. You can see the cylinder screen pattern through it. Holes are uniform in size and evenly distributed.
Chemical pinholes: Irregular, scattered holes caused by poor ink leveling and wetting on the substrate.
Fix: For mechanical — raise ink viscosity slightly or slow drying. For chemical — keep viscosity high enough for adhesion and leveling; add polyamide resin oil to improve wetting when thinning.
3. Ghosting and Halos
What you see: Printed image appears thin, pale, and incomplete (ghosting). Or a double edge forms around print boundaries (halo).
Causes:
- Uneven impression pressure or worn impression roller
- Ink viscosity too low
- Excessive cylinder pressure — ink squeezes out of cells before transfer
- Static electricity
Fix: Adjust impression pressure. Tune ink viscosity. Increase drying speed. Address static.
4. Streaks (Doctor Blade Lines)
What you see: Continuous colored lines running through non-image areas.
Causes — Ink side:
- Foreign particles or hard pigment agglomerates in ink
- Viscosity too high
- Excessive ink adhesion to cylinder
- Drying too fast or too slow
Causes — Cylinder side:
- Poor cylinder surface finish
- Excessive cell depth
- Poor chrome plating quality
Causes — Doctor blade:
- Blade is nicked or not straight
- Incorrect pressure
- Wrong blade-to-cylinder angle
Fix: Filter ink before use. Adjust viscosity. Switch to a smooth cylinder with uniform chrome. Use a straight, sharp blade at the correct angle and pressure.
5. Overflow and Flow Marks
What you see: Water-like mottling in solid areas. Ink bleeds out from printed lines into surrounding areas.
Causes: Ink viscosity too low. Poor ink flow properties.
Fix: Add fresh ink or resin-based modifier to raise viscosity. Increase press speed. Switch to a sharper doctor blade angle. Use shallower cell depth on cylinder. Improve ink flow characteristics.
6. Poor Gloss
What you see: Print surface looks dull, rough, or short of the gloss specification.
Causes:
- Low resin content in ink
- Over-thinning
- Poor resin film formation
- Substrate surface too rough
Fix: Use resin-based modifier. Slow drying slightly. Switch to a smoother substrate.
7. Screening (Reticulation)
What you see: Continuous solid areas show a mesh or screen-like pattern instead of uniform coverage.
Causes — Ink side:
- Viscosity too high — ink can’t enter cylinder cells
- Drying too fast — ink loses flow before transfer
- Insufficient ink supply
Causes — Cylinder side:
- Poor cylinder quality
- Eccentric cylinder shaft
- Poor chrome plating
- Doctor blade pressure too high
- Impression pressure insufficient
Fix: Use slow solvent to adjust viscosity and drying. Refill ink tray. For cylinder issues — only solution is to rework or replace the cylinder. Adjust blade and impression roller pressure.
8. Registration Errors
What you see: Multi-color print is misaligned — colors shift out of position, creating gaps and overlaps.
Fix — Check these systematically:
- All cylinders turning smoothly?
- Tension control set correctly?
- Register clamps loose?
- Left/right impression pressure and roller hardness OK?
- Hot air drying set correctly?
- Substrate thickness uniform?
9. Color Shift
What you see: Printed color tone drifts during the run.
Causes:
- Viscosity drift: Changes ink transfer rate and dot area — critical in multi-color work
- Temperature change: Room or ink temperature shifts alter viscosity and transfer
- Color separation in mixed inks: Organic and inorganic pigments separate by density difference, especially with poor circulation
- Moisture absorption: Over long runs, humidity enters the ink, degrading color development and reducing density
- Screen angle overlap: When first and second color screen angles clash, highlight to midtone areas show extreme density swings
- Ink blushing and direct airflow on the plate surface
Fix: Maintain consistent viscosity throughout the run. Control shop temperature. Use high-quality true solvents. Watch for screen angle conflicts during prepress.
10. Foaming
What you see: Bubbles overflow from the ink tray, disrupting circulation. Print shows mottling or polishing defects. Some foam is easy to clear; large, persistent bubbles are harder.
Causes: Excessive ink surface tension. Defective circulation system design.
Fix: Adjust viscosity to proper range. Add defoamer — but sparingly; overuse damages adhesion and lamination bond, and can backfire by making foaming worse. Eliminate air entrapment in the circulation loop. Close any elevation drops or dead zones in the ink path.
11. Mottling (Orange Peel)
What you see: Solid areas print unevenly with a speckled, blotchy appearance.
Causes:
- Press speed too slow, ink dries too slowly
- Ink over-thinned
- High thixotropy ink
- Water-based gravure inks with poor cylinder/substrate wetting
- Static electricity
Fix: Improve ink flow. Use fast-drying solvent. Raise printing viscosity within limits. Choose low oil-absorption pigments to reduce static issues. Review cylinder type and screen angle.
12. Plate Blinding (Drying-In)
What you see: Ink dries inside cylinder cells during printing, causing skipped dots and incomplete image transfer.
Causes:
- Ink drying too fast
- Poor binder re-solubility — dried ink in cells won’t re-dissolve on the next rotation, creating a compounding problem
- Dust from substrate or paper migrating into ink
Fix: Use slower-drying solvent (but watch downstream effects). Switch to a solvent with stronger dissolving power.
13. Moisture Contamination
What you see: Over long runs, resin precipitates out of the ink — gel particles form. Gloss drops, transfer suffers, plate blinding increases.
Causes: Humidity works its way into the ink over time, degrading solubility. Most common with alcohol-containing nitrocellulose ink systems, especially in high-humidity environments with low ink consumption (small print area, slow turnover).
Fix: Seal the ink tray to minimize air contact. Add water-compatible true solvent. Top up with fresh ink — avoid recycling old ink repeatedly.
14. Blushing
What you see: Ink film turns white and cloudy during drying. Gloss, adhesion, and film strength all degrade. Once blushing occurs, there’s no recovery — the product is scrap.
Causes — Resin blushing: Solvent evaporation balance breaks during drying. Resin becomes insoluble, goes cloudy, and partially gels.
Causes — Water blushing (the more common form): Solvent evaporation cools the ink surface. Ambient moisture condenses into the ink layer and causes gelation. Most frequent with high-alcohol nitrocellulose inks in high-humidity conditions.
Fix: Increase dryer capacity. Control pressroom temperature and humidity. Reduce alcohol solvent ratio. Add a small amount of slow, true solvent.
15. Pigment Settling
What you see: Pigment settles out of the ink, causing color drift, plate blinding, and dirty printing.
Causes:
- Poor pigment dispersion in the binder — pigment agglomerates
- Inadequate grinding — hard, compact sediment forms
- Viscosity too low — binder can’t hold pigment in suspension
Fix: Add anti-settling agent. Ensure thorough pigment dispersion and grinding. Use compatible pigment-binder combinations. Stir ink thoroughly before loading.
16. Strike-Through
What you see: Ink penetrates through to the reverse side of the substrate.
Causes:
- Substrate too absorbent
- Ink viscosity too low
- Poor ink drying
- Poor ink flow
Fix: Raise viscosity. Use fast solvent and increase press speed. Boost dryer capacity. Switch to ink with better flow characteristics.
17. Polishing (Transfer Failure)
What you see: Print surface appears polished or glossy in patches — ink transfer from cylinder to substrate is incomplete.
Causes:
- Ink viscosity too high — won’t release from cells
- Poor doctor blade wiping — leaves residual ink film
- Airflow hitting the cylinder — disrupts ink transfer
Fix: Lower viscosity. Extend doctor blade edge. Add slow solvent. Check impression roller hardness — switch to softer if needed. Never direct airflow at the cylinder. Check exhaust fan position — moving air near the plate contributes to this defect.
References
- Wikipedia: Rotogravure: Overview of the gravure printing process, cylinder engraving, ink systems, and common applications including packaging.
- ISO 12647-4:2014 — Gravure Process Control: International standard for color separation, tone value, and production consistency in gravure printing.
- Wikipedia: Doctor Blade: Description of doctor blade function in gravure and flexographic printing, blade materials, and common wear patterns.
- Flexible Packaging Association (FPA): Industry resource covering printing, lamination, and converting best practices relevant to gravure packaging operations.
- ISO 12647-2:2013 — Offset Process Control: Density and colorimetry measurement framework applicable to print quality verification across processes.