Adhesivo para Tubos de Cartón y Bobinado de Núcleos: Selección, Aplicación y Solución de Problemas

Paper tubes and cores are everywhere in manufacturing — toilet tissue rolls, textile bobbins, film cores, poster tubes, concrete formwork and industrial shipping drums. The adhesive that bonds each spiral-wound layer determines whether a core crushes under load or holds firm at 2,000 RPM on an unwinding machine. Yet most converting plant managers inherit their adhesive supplier and never question whether the formulation still matches their current line speed, substrate grade or end-use requirement.

This guide covers the four major adhesive technologies used in paper tube and core winding, explains how to match adhesive properties to production parameters, and provides a troubleshooting framework for the most common defects — delamination, soft cores and telescoping.

How Paper Tube Winding Works

Spiral winding machines feed 2 to 12 strips of paperboard at overlapping angles around a mandrel. Adhesive is applied between layers by roller coater, spray nozzle or curtain coater. The wet strips wrap under tension, and the adhesive must develop enough tack to hold layers in place before the tube exits the mandrel — typically within 1 to 4 seconds depending on line speed.

Two production variables define everything about adhesive selection:

Line speed (m/min) — Slower manual lines run at 5-15 m/min; high-speed winders reach 60-120 m/min. Faster lines need faster tack development.
Core wall thickness and ply count — A 3-ply tissue core has different compression requirements than a 15-ply industrial core carrying 500 kg of steel wire.

Four Adhesive Technologies Compared

Property	Modified PVA	Dextrin (starch)	Hot Melt (EVA/PO)	Sodium Silicate
Typical solids (%)	20-30	35-55	100	35-45
Open time (sec)	3-8	2-5	<1	5-15
Max line speed	60 m/min	120 m/min	120+ m/min	30 m/min
Flat crush strength	Good	Good-Excellent	Moderate	Excellent
Water resistance	Moderate	Poor	Good	Poor
Cost per tonne (relative)	1.0x	0.6-0.8x	2.5-3.5x	0.3-0.5x
Best application	General purpose, tissue cores	High-speed converting, heavy industrial cores	Moisture-exposed packaging	Budget cores, low-speed lines

Modified PVA: The Workhorse for General Converting

Modified PVA (polyvinyl alcohol / polyvinyl acetate blends) is the most widely used adhesive in paper tube production globally. Its popularity comes from a combination of adequate performance across most parameters, simple handling — water-based, non-toxic, no heated application equipment needed — and broad substrate compatibility with recycled and virgin paperboard grades.

For tissue and towel cores (the highest volume segment), modified PVA delivers sufficient flat crush resistance at competitive cost. A typical formulation runs at 22-28% solids with a viscosity of 3,000-8,000 mPa·s at 25°C, applied via roller coater at 8-15 g/m² wet coat weight.

The limitation of PVA in core winding is speed. Above 60 m/min, PVA cannot develop adequate wet tack to prevent ply slippage on the mandrel. Plants running high-speed winders (>60 m/min) either switch to dextrin-based formulations or use PVA with booster additives that accelerate tack development — at a cost penalty of 15-25%.

Desay Paper Tube Core Glue is a modified PVA formulation engineered specifically for spiral winding at speeds up to 60 m/min. It achieves rapid initial tack through proprietary tackifier blending that eliminates the need for heated mandrels or auxiliary drying systems on standard converting lines.

Dextrin and Starch Adhesives: Speed and Crush Strength

For industrial-grade cores — the kind that carry rolls of steel coil, aluminium foil or heavy plastic film — dextrin-based adhesives dominate. Yellow dextrin (from tapioca or maize starch, acid-modified) provides two properties that PVA cannot match simultaneously: very fast wet tack (2-5 seconds) and high dried-film rigidity that maximises flat crush and radial crush values.

According to research from the Technical Association of the Pulp and Paper Industry (TAPPI), core crush strength correlates directly with the glass transition temperature of the adhesive bond line. Dextrin films have Tg values of 120-180°C compared to 30-40°C for standard PVA, which explains why dextrin-bonded cores resist creep under sustained compressive load far better than PVA-bonded cores at ambient temperature.

The trade-off is moisture sensitivity. Dextrin adhesives re-soften in humid conditions (>85% RH), making them unsuitable for cores stored in uncontrolled tropical warehouses or used in direct water-contact applications. For export shipments to tropical regions, a moisture-resistant modified PVA or hot-melt system is the safer choice.

Hot-Melt Systems: Moisture Resistance Without Drying

Hot-melt adhesives (EVA or polyolefin-based) are applied molten at 140-180°C and set within 1-2 seconds by cooling — no water evaporation required. This eliminates the drying bottleneck entirely, which matters in two scenarios:

Thick-wall cores (>15 mm wall) where water-based adhesives trapped between inner plies create soft spots that only appear days later as the core "relaxes"
Moisture-barrier applications where the finished core will be exposed to condensation, high humidity or direct water splash during its service life

The cost penalty of hot melt is significant — 2.5 to 3.5 times the material cost of PVA or dextrin per tonne, plus the capital investment in heated application heads (USD 15,000-50,000 per winding station). Most plants reserve hot melt for specialty cores and run water-based adhesives on their general-purpose lines.

Troubleshooting Common Defects

Delamination (ply separation)

Cause: Inadequate adhesive penetration into the paper surface, usually from too-high viscosity, too-low coat weight, or glazed/calendered paper stock that resists wetting. Fix: Reduce viscosity by 10-15% (add water for water-based systems), increase roller pressure or switch to a lower-viscosity grade. For glazed stocks, pre-treat with corona discharge or switch to a formulation with wetting agents.

Soft cores (low crush resistance)

Cause: Either the adhesive has not dried completely before the tube is cut and stacked (common with PVA on thick-wall cores), or the formulation lacks sufficient rigidity after cure. Fix: Increase drying time or temperature, switch from PVA to dextrin for heavy-duty cores, or reduce line speed to allow more mandrel contact time.

Telescoping (inner plies sliding axially)

Cause: Insufficient initial tack during winding allows inner layers to shift before the adhesive sets. More common at high speeds or with adhesives past their open-time window. Fix: Switch to a higher-tack grade, reduce the distance between adhesive application point and the mandrel nip, or lower line speed until tack catches up.

Edge curl / springback

Cause: Uneven adhesive distribution across the strip width, with edges receiving less adhesive than the centre. Fix: Inspect roller coater for wear patterns, replace worn doctor blades, ensure strip tracking is centred on the application roller.

Supplier Evaluation Checklist for Converting Plants

When sourcing paper tube adhesive from a new supplier, verify these seven points before committing to production trials:

Viscosity specification with tolerance band — batch-to-batch variation above ±10% causes coat weight drift and inconsistent bonds
Shelf life and storage conditions — most water-based tube adhesives have 6-12 month shelf life at 5-35°C; freezing destroys the emulsion irreversibly
Compatibility testing with your specific paper stock — recycled fibre, OCC, kraft virgin and coated grades all absorb adhesive differently
Technical data sheet with TAPPI test results — flat crush (TAPPI T825), radial crush, moisture content of bonded joint
MOQ and lead time — typical industrial MOQ ranges from 500 kg to 5 tonnes per order
Environmental compliance — VOC content, formaldehyde-free declaration, food-contact suitability if cores contact food packaging
On-site application support — reputable suppliers offer trial supervision to optimise coat weight and machine settings for your specific line

Desay Industrial supplies paper tube and core winding adhesives with MOQ from 500 kg and 15-day delivery worldwide. All products ship with complete TDS documentation and REACH/SGS certification. Request a sample or technical consultation to evaluate performance on your specific winding line and paper grade.

When to Switch Adhesive — and When Not To

Three signals suggest your current adhesive is costing you money:

Crush test failures exceed 2% of production (industry benchmark: <0.5%)
Your line speed is capped by adhesive tack development, not by mechanical limits
Delamination claims from end-users have increased after your paper supplier changed furnish composition

Conversely, do not switch adhesive if your defect rate is below 0.5% and your current supplier delivers consistently. Changing adhesive on a winding line requires 1-2 weeks of optimisation trials, and production is never quite the same on Day 1 as Day 14.