Tissue Line Emboss Lamination Glue Control Guide 2026
Expected Publish URL: tissue-line-emboss-lamination-glue-control-guide-2026
The Two-Ply Sheet That Split in the Box
Sofia Lindqvist, quality manager at a facial tissue converter in southern Sweden, was fielding an unusual complaint. Consumers were pulling a two-ply sheet from the box and finding the plies separated inside the carton - not at the consumer's hand, but in transit. Sofia's first response was to raise the lamination glue add-on, and the short-term rejects fell. Three weeks later the same complaint returned, this time because the higher add-on had hardened the ply bond and the emboss felt flat. Her team then measured glue coverage across the web and found it was not low overall but uneven, concentrated at one edge because of a worn applicator roll. Fixing the roll, not the glue amount, restored bond consistency. This guide explains lamination glue control properly.
Emboss lamination glue bonds the plies of a two-ply tissue sheet, and its job is to produce a bond that survives converting and transit without stiffening the sheet. Control the add-on at 0.3-1.0 g/m2 for standard two-ply facial tissue, keep coverage uniform across the web to within about 10%, and select the glue and applicator so that the bonded area is a small fraction of the sheet. Ply separation in the box is almost always a coverage or cure problem, not an add-on problem; raising the glue quantity to fix an uneven application stiffens the product and wastes adhesive.
What Lamination Glue Actually Does
In a two-ply tissue product, the plies are held together by discrete glue points applied by an applicator roll or a spray head, then pressed and dried. The bond must do two contradictory things: hold the plies together through winding, converting, packing, and transport, and allow the sheet to feel soft and to emboss deeply. The way to satisfy both is a small bonded area with a strong point bond, not a large bonded area with a weak one.
Industry practice across European facial tissue converters holds ply-bond coverage to roughly 15-30% of the sheet area, because coverage above about 40% measurably stiffens the sheet, while coverage below about 10% risks ply separation on high-speed converting and packing lines.
The web tension behavior that pairs with lamination is described in our [facial tissue interfold line tension guide](https://yoco-group.com/blog/facial-tissue-interfold-line-tension-control-guide-2026).
Add-On Rates and Coverage
| Parameter | Typical range | Effect if too low | Effect if too high |
|---|---|---|---|
| Glue add-on | 0.3-1.0 g/m2 | Ply separation | Stiff, flat emboss |
| Coverage of sheet | 15-30% | Weak bond at edges | Hard hand feel |
| Cross-web uniformity | within 10% | Edge-only separation | Visible bond lines |
| Application solids | per supplier spec | Poor early tack | Slow cure, blocking |
| Bond cure before winding | 0.2-0.5 s | Ply slip at winder | Adhesive transfer |
Applicator Roll and Anilox Selection
The applicator roll determines coverage uniformity, and coverage uniformity determines whether the glue you paid for ends up where the plies need it. For roll-applied lamination, use a gravure or anilox roll matched to the target add-on, and inspect it for wear, scoring, and cell clogging whenever the add-on drifts. A roll that has worn unevenly across its face produces the exact pattern Sofia found: adequate total add-on, but concentrated at one edge.
- Confirm the roll's cell volume against the target add-on after any changeover.
- Check the doctor blade for nicks and correct loading; a chipped blade streaks the film.
- Verify roll-to-backing-roll pressure is uniform across the face with a nip impression test.
- Clean cells on schedule; build-up changes both add-on and pattern.
Applicator and roll maintenance follow the same discipline as the wider converting line, described in our [tissue paper machine guide](https://yoco-group.com/blog/tissue-paper-machine-guide-2026).
TAPPI technical resources for tissue converting frame lamination bond strength as a product performance characteristic, and industry practice compares bond results only between samples of the same grade and basis weight.
Common Failure Modes
ASTM test methods for tissue and paper products provide the sampling and conditioning basis on which ply-bond and softness comparisons should be made, and industrial practice assesses ply separation on samples conditioned to 23 degrees C and 50% relative humidity rather than on as-produced samples at the machine.
The three most common failure modes are edge-only ply separation from an uneven applicator roll, ply slip at the winder from an under-cured bond, and stiff/flat product from over-coverage. Each maps to a different fix: roll wear, cure time, and coverage, respectively. Do not confuse them.
| Symptom | Likely cause | Corrective action |
|---|---|---|
| Plies separate at one edge | Uneven applicator roll | Reface or replace roll |
| Plies slip at winder | Under-cured bond | Extend cure, adjust solids |
| Flat, stiff sheet | Coverage above 40% | Reduce add-on, restore emboss |
| Visible bond lines | Doctor blade or cell clogging | Clean/replace blade, clean cells |
The Bottom Line
Lamination glue control is coverage control. Hold add-on between 0.3 and 1.0 g/m2 for standard two-ply facial tissue, keep coverage uniform to within 10% across the web, and keep bonded area in the 15-30% band so the sheet stays both bonded and soft. When plies separate in the box, measure coverage pattern before you touch the glue amount - the number that usually moves is the applicator roll, not the pump.
FAQ
What glue add-on should two-ply facial tissue use?
Roughly 0.3-1.0 g/m2, with coverage of about 15-30% of the sheet area. Above about 40% coverage the sheet stiffens and the emboss feels flat.
Why do ply separation defects appear at one edge only?
Usually an uneven or worn applicator roll that applies more glue at one edge. Verify cross-web uniformity to within 10% before changing the total add-on.
How soon must the lamination bond cure before winding?
Often within about 0.2-0.5 s so that the plies do not slip at the winder. Under-cured bonds are a common source of ply slip at speed.
Does more lamination glue always mean a stronger bond?
No. Above about 40% coverage the extra glue stiffens the sheet without improving the bond that matters, and it wastes adhesive.
How should ply bond strength be compared?
On samples conditioned to 23 degrees C and 50% relative humidity, following ASTM paper testing practice, rather than on as-produced samples at the machine.
Changeover and Cleaning Discipline for Lamination Glue
Lamination glue behaviour changes the moment a line stops. Glue left on an applicator roll or in a supply line can skin over, thicken, or dry into a film that later releases as a spot defect. The same glue that ran clean for a whole shift can produce add-on rate drift in the first minutes after a changeover, purely because the roll surface has been sitting. Good cleaning and changeover discipline is what keeps the glue system inside its process window across product changes.
The first rule is a defined stopping sequence. Before the line halts for a changeover, reduce the glue supply and let the applicator roll turn long enough to clear the working film without drying the surface. Stopping with a full glue film on the roll and leaving it through a break is the most common cause of a rough restart.
The second rule is a cleaning protocol matched to the glue chemistry. Different glue systems respond to different cleaning fluids, and a fluid that works well on one may leave a residue on another. Document the fluid, the contact time, and the rinse for each glue type, and treat the protocol as part of the changeover card rather than as informal shop practice.
The third rule is measurement after restart. The first few ply samples after a changeover should be checked for add-on rate and coverage, because the system takes time to settle. If the first sample is out of band, correct before the run is allowed to build volume, and record whether the deviation was glue-related or mechanical.
The fourth rule is storage and handling. Glue that has been open to the air, or a batch that has been topped up into an old container, can carry a different viscosity into the system. Rotate stock, seal partial containers, and note the batch on the changeover record so a later defect can be traced back to its supply.
Cleanliness in a lamination glue system is not cosmetic. It is the difference between a stable add-on rate and a line that spends the first hour of every run chasing a defect it cannot see.