| HS Code | 574862 |
| Chemical Type | Polyvinyl Acetate (PVAc) Homopolymer |
| Appearance | Milky-white viscous liquid |
| Film Flexibility | Flexible when dry |
As an accredited PVAc Tube Winding Adhesive factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg HDPE drums with sealed lids, ensuring safe storage and easy dispensing for industrial use. |
| Container Loading (20′ FCL) | 20′ FCL loading: PVAc tube winding adhesive in sealed drums on pallets, securely braced, protected from moisture and direct sunlight. |
| Shipping | PVAc Tube Winding Adhesive ships as a non-hazardous, water-based polymer dispersion. Available in drums, totes, or bulk tankers. Protect from freezing during transit; standard ground freight is typical. Ensure containers remain upright and labeled per manufacturer guidelines. |
| Storage | Store PVAc Tube Winding Adhesive in a cool, dry, well-ventilated area, away from direct sunlight and heat sources. Keep containers tightly sealed when not in use. Avoid freezing; ideal storage temperature is 5–30°C. Use within the manufacturer’s stated shelf life to maintain optimal bonding performance. |
| Shelf Life | Shelf life is 12 months from manufacture when stored sealed in original container below 30°C. |
On a spiral tube winder processing 100% recycled coreboard at line speeds between 25 m/min and 60 m/min, film-core delamination during slitting is governed by wet tack development under the compression belt rather than by final dry bond strength alone. In this application, PVAc tube winding adhesive is metered onto one face of each coreboard ply by a grooved applicator roll at a wet coat weight of 18 g/m² to 34 g/m², corresponding to an addition ratio of 6.0–9.5% by mass of dry coreboard. The adhesive solids are typically between 47% and 53%, with Brookfield viscosity at 25°C ranging from 1800 mPa·s to 6500 mPa·s, and the wet film must reach a solids content above 88% before the flying cut-off saw to prevent edge ply slippage when the tube is cut into narrow core segments. The mandrel is held at 65–85°C, and dwell time under the compression belt is governed by tube diameter, wall thickness, and ply count, typically ranging from 0.8 s to 2.4 s per layer. Recycled coreboard moisture variance from 7% to 11% shifts adhesive transfer by as much as 3 percentage points, so the applicator roll gap is adjusted by laser caliper feedback rather than by fixed-position metering. Downstream, the rough-cut cores are dried in forced-air chambers at 35–50°C and 10–20% relative humidity for 24–72 h, then end-trimmed and chamfered for winding machines. Terminal products include 152 mm inside-diameter cores for biaxially oriented polypropylene film, 76 mm labelstock cores for PET liner materials, and 300 mm jumbo cores for blown film lines. Compliance for indirect food-contact flexible packaging is verified against FDA 21 CFR 175.105 adhesive extraction limits and Regulation (EC) 1935/2004 Article 3 for overall migration; industrial film cores that never contact food are evaluated under REACH Annex XVII restrictions and ISO 11093-4 for dimensional tolerances after conditioning at 23°C and 50% RH. The main process conflict is that increased plasticizer loading improves initial tack but depresses interlayer shear above 40°C, a temperature reached during high-tension film slitting, so the adhesive formulation must hold residual plasticizer below the level at which the glass transition temperature falls under 12°C.
At core diameters below 76 mm, thin-gauge aluminum foil rewinding generates frictional heat at the core surface that can raise the adhesive interlayer film above the glass transition of an unmodified PVAc homopolymer, leading to spiral shear deformation at the ply interfaces. For foil-core construction, the addition ratio is typically set lower than in flexible film cores, between 5.0% and 7.5% of dry coreboard mass, because adhesive mass transfer into the board interior must be minimised to preserve surface hardness and machinability. Wet coat weight per ply is held between 14 g/m² and 22 g/m², and the adhesive solids are usually at the upper end of 50–55% to reduce water load in thick-walled tubes that may contain 8–14 plies. The downstream production process is a spiral winding line equipped with a polishing roll after the compression belt; the roll densifies the outer ply and closes adhesive film pinholes that would otherwise catch aluminum foil during high-speed transfer. Tubes are cut with a tungsten carbide slitting knife while the adhesive is below its tackification range, then conditioned for 48–72 h at 30–35°C to remove residual moisture before foil contact. Terminal products include 150 mm and 300 mm inside-diameter cores for household foil, 406 mm cores for converter foil rolls, and 76 mm cores for foil-laminated flexible packaging. Compliance standards are application-dependent: foil cores that contact food indirectly through the foil wrapper are assessed under FDA 21 CFR 175.105 and Regulation (EC) 1935/2004, while industrial foil cores are evaluated under REACH Annex XVII and ISO 11093-6 bending strength after conditioning. The limiting process parameter is spindle speed; when core temperature exceeds 45°C at the rewind shaft, a PVAc grade with higher molecular weight and reduced plasticizer content is required, but this reduces open time and may create a reject condition at the ply overlap where the adhesive film has formed before the next ply is pressed into place.
Spiral winding of composite canisters for low-moisture food powders moves the adhesive from a purely structural bond to an indirect food-contact layer that must resist product oils, retort humidity, and liner delamination while continuing to meet migration limits. In canister construction, PVAc tube winding adhesive is applied at a wet coat weight of 22–38 g/m² per ply, yielding an addition ratio of 8.0–12.0% by dry coreboard mass; the higher loading relative to film cores is necessary because canister burst strength is dependent on continuous adhesive coverage across the barrier liner and outer label plies. The downstream process uses a multi-station spiral winder that simultaneously winds the inner aluminium foil or HDPE liner, one or two adhesive-coated coreboard plies, and a printed label ply under a compression belt at 0.15–0.30 MPa belt pressure. The wound tube is cut into canister bodies, then dried at 40–55°C for 48–96 h to achieve moisture levels below 0.8% in the adhesive layer before end seaming; residual free water in the adhesive can reduce the heat seal between the body and metal end rings. Terminal finished products include cylindrical canisters for powdered milk, whey protein, cocoa powder, and dry confectionery, with diameters from 65 mm to 153 mm and wall thicknesses from 1.2 mm to 3.5 mm. Compliance requires verification against Regulation (EC) 1935/2004 Article 3, FDA 21 CFR 175.105 adhesive extraction limitations, and Commission Regulation (EC) 2023/2006 Annex II good manufacturing practice for food-contact materials. Where the liner is a plastic layer, EU 10/2011 overall migration limits are applied to the plastic layer, not to the PVAc film, because the adhesive is behind a functional barrier. The main formulation constraint is water resistance versus repulpability: dicyandiamide or glyoxal crosslinkers at low addition levels improve wet strength but can generate formaldehyde release above detection limits if not controlled, so canister adhesives are specified with free formaldehyde below 10 ppm by adhesive dispersion mass.
The production sequence for cylindrical concrete forms and void sleeves begins with heavier coreboard plies than packaging cores, and the PVAc tube winding adhesive is specified for water resistance during exterior concrete curing rather than for dry bond strength alone. The addition ratio in this segment is higher, typically 10.0–14.0% of dry coreboard mass, with wet coat weights from 35 g/m² to 55 g/m² on the inner and outer plies; the heavier wet film is required to fill the surface porosity of high-caliper kraft linerboard and to maintain a continuous spiral glue line under formwork pressure. The adhesive is supplied at solids of 50–55% and is usually formulated with polyvinyl alcohol or styrene-acrylate copolymer modification to achieve a wet-strength plateau after film formation. In the downstream spiral winding process, the tube is formed on a mandrel with an internal steam or electric heating line at 70–90°C, and the adhesive-coated plies are pressed by a caterpillar belt at 0.2–0.4 MPa. The wound tube is cut to length while still on the mandrel, then rotated in a drying rack at 40–60°C for 72–168 h to remove residual water; premature mandrel extraction at residual moisture above 1.5% causes spring-back and visible spiral cracking. Terminal products include disposable circular concrete column forms from 150 mm to 1200 mm internal diameter, slab void sleeves, and pier forms. Compliance is not food-contact driven; the relevant controls are REACH Annex XVII, local construction-product VOC emission requirements, formwork pressure calculations referenced to ACI 347R-14, and dimensional checks referenced to ISO 11093-4 and bending resistance tested according to ISO 11093-6 after 24 h water immersion. The critical operational boundary is that PVAc alone will re-emulsify during extended exposure to wet concrete; therefore, the adhesive must be crosslinked sufficiently to prevent delamination at pH 12–13 concrete pore water, but excessive crosslinking creates brittle cutting edges and increases saw blade dust during site trimming.
Textile yarn carriers wound on high-speed automatic winders at 40–60 m/min require a PVAc tube winding adhesive that does not transfer tack to yarn, does not chalk under tension, and retains bond integrity after dye-bath exposure. The addition ratio is typically 5.5–8.0% of dry coreboard mass, and wet coat weight per ply ranges from 15 g/m² to 25 g/m²; this lower loading prevents adhesive strike-through into the outer parchment layer that can cause yarn snagging during package build-up. The production process uses spiral winding with a polished surface roll after the compression belt, and the adhesive film is dried to a surface tack level below 0.2 N/25 mm measured by loop tack according to ASTM D6195 after 24 h conditioning at 23°C and 50% RH. In dye-tube variants, the tubes are post-waxed or lacquered, and the adhesive layer must withstand immersion in hot dye liquor at 90–130°C for up to 60 min without delamination; this is achieved through the use of crosslinkable PVAc grades or blends with polyvinyl alcohol that reduce re-emulsification. Terminal products include ring-spinning tubes, draw-texturing tubes, open-end spinning cones, and dye package carriers with inside diameters from 50 mm to 90 mm and wall thicknesses from 2.0 mm to 6.5 mm. Compliance in textile applications is dominated by REACH SVHC screening and downstream fabric certification schemes such as OEKO-TEX Standard 100 Annex 4; the adhesive itself is not the final article, but its non-volatile fraction must not contain substances that would transfer to yarn and exceed the relevant limit values. The main process conflict is between wet strength and machinability: a highly crosslinked adhesive survives the dye bath but creates high cutting forces and edge fuzz on automatic tube saws, while an uncrosslinked PVAc can re-emulsify and cause the outer plies to unwind during yarn dyeing.
In slitting and rewinding of pressure-sensitive adhesive tape, static accumulation on paper cores can cause web steering errors and operator-level discharge hazards, so the PVAc tube winding adhesive must be compatible with antistatic coreboard or with conductive carbon black dispersions incorporated at the spiral winding stage. The addition ratio for tape cores is typically 6.0–8.0% of dry coreboard mass, with a wet coat weight of 20–30 g/m² per ply; the adhesive layer must not insulate the core surface, and its surface resistivity contribution is assessed on the finished core rather than on the adhesive alone. The downstream process is a high-speed spiral tube line followed by in-line cutting into narrow core rings; the winder is often equipped with a static elimination bar, and the adhesive film must have dried to below 0.5% moisture before the dust-chamber sanding station, because residual water increases surface resistivity and interferes with carbon black contact. Terminal products include tape cores of 75 mm, 50 mm, and 25 mm inside diameter used for double-sided tapes, masking tapes, and BOPP carton sealing tapes. Compliance requirements for this segment are primarily electrostatic and dimensional: finished cores are tested for surface resistance using methods derived from IEC 61340-2-3 with a dissipative target below 10^11 Ω, and mechanical dimensions are checked against ISO 11093-4; REACH Annex XVII applies to the minor carbon black and dispersant system. Published data for the precise surface-resistance response of PVAc/carbon black mixtures in spiral tube winding is limited, so the 0.5 s static decay threshold should be confirmed by mill trial rather than by resin-level prediction alone. The key process threshold is the trade-off between antistatic performance and adhesion: adding more than 2.0 wt% conductive carbon black to the adhesive dispersion lowers interlayer shear and increases viscosity beyond the applicator roll transfer window, while too little carbon black produces a core that cannot dissipate charge quickly enough for solvent-based tape coating rooms.
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Poly(vinyl acetate) homopolymer dispersion PVAc-TW-4100 is a cold-application waterborne adhesive for spiral and convolute winding of paperboard tubes, coreboard shafts, textile carriers, and composite can bodies. The standard grade is a colloid-stabilized, non-plasticized dispersion with solids content of 47–50 % according to ISO 3251:2019, Brookfield RVT viscosity of 8,000–12,000 mPa·s at 25 °C with spindle 6 at 20 rpm according to ISO 2555:2018, and pH of 4.0–5.5 according to ISO 976:2021. Density is 1.06–1.08 g/cm³ according to ISO 2811-1:2023. Minimum film formation temperature is 5 °C according to ISO 2115:2000. The dried film has a nominal glass transition temperature of 28 °C at a differential scanning calorimetry heating rate of 10 K/min. The product is supplied in 30 kg pails, 200 kg drums, and 1,000 kg intermediate bulk containers. The base grade contains no intentionally added plasticizer; up to 5 wt% of dibutyl phthalate or triacetin may be incorporated, but plasticizer addition depresses film modulus and extends open time, and therefore must be validated on the target production line.
| Property | Test method or instrument | Specified value |
|---|---|---|
| Solids content | ISO 3251:2019, forced-air oven | 47–50 % |
| Brookfield viscosity | ISO 2555:2018, spindle 6, 20 rpm, 25 °C | 8,000–12,000 mPa·s |
| pH | ISO 976:2021 | 4.0–5.5 |
| Density | ISO 2811-1:2023 | 1.06–1.08 g/cm³ |
| Minimum film formation temperature | ISO 2115:2000 | 5 °C |
| Glass transition temperature | DSC, 10 K/min | 28 °C nominal |
| Median particle size | ISO 13320:2020, laser diffraction | 0.5–2.0 µm |
| Residual vinyl acetate monomer | GC-FID, calibrated to 0.01 % | <0.1 % w/w |
| Shelf life | Unopened, 5–30 °C | 12 months |
The dispersion is stabilized by a protective colloid system, typically poly(vinyl alcohol) or a modified cellulose colloid, which controls low-shear viscosity and roll transfer. The acidic pH range of 4.0–5.5 is operationally significant: it modulates wet tack and colloid swelling. At pH above 8.5 the dispersion begins to flocculate, and at pH below 3.5 the protective colloid can hydrolyze with a resulting collapse in viscosity. The glass transition temperature near 28 °C gives the dried film enough hardness to resist blocking during storage of finished tubes, while retaining sufficient flexibility to withstand mandrel collapse and rotary slitting. Coalescence depends on water loss and particle deformation; the substrate surface temperature must remain above the minimum film formation temperature of 5 °C or the dried film will form a low-adhesion powdery layer.
Substrate moisture at the unwind stand should be kept below 10 %, because higher moisture slows the evaporation front and can produce interfacial blistering under winding tension. Recovered coreboard with ash content above 15 % may lower measured peel strength because mineral filler at the surface creates a weak boundary layer. Alkaline reserve from calcium carbonate above 0.5 % in the sheet can buffer the adhesive pH upward at the interface and delay wet-tack development. This interaction is known on recycled coreboard grades with high carbonate loading; line qualification typically requires adjustment of nip pressure and open-line distance rather than acidification of the adhesive.
High-speed tube winding transfers the adhesive by chrome-plated metering rolls or doctor-roll coaters with a transfer roll hardness of 60–70 Shore A. The dry coating weight is typically 5–20 g/m² per ply, depending on paper porosity and basis weight. Porosity should be controlled by ISO 5636-5:2013; values below 15 s/100 mL promote rapid strike-through and shorten effective open time at the nip. The open time measured in the laboratory at 23 °C and 50 % RH is 8–12 min. On production winders with heated mandrels and forced air, practical open time can fall below 60 s. Initial set typically occurs within 15–30 s under nip pressure of 0.2–0.5 MPa on recycled coreboard with 6–8 % moisture. The adhesive bath is maintained at 25–30 °C, a window of approximately ±5 °C. Above 35 °C, viscosity drift appears within a single shift and skinning on the transfer roll increases. Below 20 °C, coalescence rate declines and the film may remain tacky before the nip. These thresholds limit winding speed more than shear stability in many production settings.
Under high-shear recirculation at 400 s⁻¹ and 30 °C for 24 h, viscosity retention should remain above 85 % of initial. Published data for this specific configuration is limited; the value must be confirmed on the actual pumping system because pump type, line fill volume, and temperature all affect mechanical shear history. Recirculation loops should use stainless steel or high-density polyethylene. Mild steel fittings release iron ions that shift pH and generate rust-colored deposits on the metering roll. Water dilution is permissible only up to 5 wt%; dilution below 40 % solids reduces wet tack and increases soak-through on lightweight sheets. For mandrel diameters below 12 mm, the adhesive should be applied at the lower viscosity bound and the wet film thickness reduced by 10–20 % relative to large-diameter mandrels, because the shorter contact arc on small mandrels requires faster wet grab and minimal squeeze-out.
Spiral winding and convolute winding impose different rheological demands. Spiral lines running at 80–120 m/min usually perform best with viscosity in the 8,000–10,000 mPa·s band to allow clean transfer roll split. Convolute winding, which applies adhesive to cut sheets and presses them around a stationary mandrel, can operate in the 10,000–12,000 mPa·s band because line speed is lower and the press cycle is longer. These viscosity settings are starting points; the final value must be linked to roll hardness, paper thickness, and ambient dew point.
On spiral core lines producing 76 mm inside diameter cores with 0.35 mm recycled paperboard and 3 plies, published production data for comparable PVAc systems indicates dry adhesive consumption of 9–14 g/m² per ply at 80 m/min. The range shifts with paper surface treatment and coating head geometry. The adhesive bonds uncoated kraft, recycled coreboard, and lightly clay-coated paper. It is not recommended for high-gloss polyethylene-coated papers or silicone release liners unless surface energy is raised above 32 mN/m by corona treatment. On high-shear metering lines, a recirculation flow rate of 5–10 L/min per 500 mm web width is generally sufficient to avoid cavitation when the product is within specification. Wound tubes can be cut after 2–4 h at 23 °C and 50 % RH; full handling strength develops within 24 h. High-speed rotary cross-cutting demands adequate inter-ply adhesion; qualification is usually performed with a 90° peel test on 25 mm strips at a jaw speed of 100 mm/min, but published data for this specific configuration is limited and the failure mode must be confirmed on the intended core line.
PVAc dispersion is applied at 18–30 °C and sets by water evaporation and coagulation. Ethylene-vinyl acetate hot melt is applied at 160–180 °C and sets by melt solidification; this provides immediate green strength and better wetting on pre-coated, low-porosity papers. The hot-melt process requires heated tanks, heated hoses, and die maintenance, and stagnant heated material can char. PVAc dispersion does not require heated application equipment and avoids hot-melt char, but it needs drying capacity or open-line residence time before the finished tube is cut. Starch and dextrin adhesives are supplied at solids levels commonly around 55–65 %. They are lower in raw material cost, but their films are more hydrophilic and generally weaker under humid storage than PVAc homopolymer films, and they require robust biocide control. The standard PVAc homopolymer film remains redispersible in water and is not waterproof. For applications requiring more water resistance, crosslinking PVAc grades must be selected; standard tube winding homopolymers are not classified under D3 or D4 water resistance according to EN 204:2016 unless measurable crosslinking is present.
Residual vinyl acetate monomer in PVAc-TW-4100 is below 0.1 % w/w. The standard grade contains no intentionally added formaldehyde or phthalates. Wet cleanup uses tap water at 20–40 °C; dried films require warm water or dilute acetic acid. EVA hot-melt residues usually require solvent or thermal removal. Starch lines require hot-water washdown and biocide control. The choice between PVAc and EVA on a given line is therefore driven by the substrate surface energy, available drying length, and whether the line can tolerate hot-melt equipment. PVAc is preferred when low odour, water cleanup, and low application temperature are controlling parameters, provided that the production line has sufficient drying capacity.
| Property | PVAc dispersion PVAc-TW-4100 | EVA hot melt | Starch/dextrin |
|---|---|---|---|
| Application temperature | 18–30 °C | 160–180 °C | 25–35 °C |
| Setting mechanism | Evaporation and coagulation | Melt solidification | Evaporation |
| Open time at 23 °C | 8–12 min | <2 s | 5–15 s |
| Water resistance | Limited; redispersible without crosslinking | Higher after set; not redispersible | Lower; highly hydrophilic |
| VOC content | <1 % | <1 % | 0 % |
| Wet cleanup | Tap water at 20–40 °C | Solvent or thermal removal required | Hot water |
| Microbial stability | Preserved in formulation | Not susceptible after solidification | Requires biocide control |
| Use on low-porosity coated paper | Moderate; requires lower coating weight or corona treatment | Higher immediate tack | Lower |
The product is formulated to comply with REACH Regulation (EC) No 1907/2006 without intentionally added substances of very high concern above 0.1 % w/w. For indirect food contact, the dried adhesive can be used under FDA 21 CFR 175.105 and 21 CFR 176.170, provided that the adhesive is separated from food by paperboard or an additional functional barrier and that migration limits are validated for the specific food type, temperature, and contact time. The product is not classified as flammable under CLP Regulation (EC) No 1272/2008. It is not intended for structural wood bonding or continuous water immersion service. The safety data sheet remains the controlling document for occupational exposure limits and disposal.
Storage in sealed original containers at 5–30 °C is required. Freezing is not reversible; exposure below 0 °C for more than 48 h can produce irreversible aggregation and screen-blocking particles larger than 250 µm. Shelf life in unopened containers is 12 months from production date. Opened totes should be covered or recirculated to limit skinning. The dispersion should not be mixed with high-pH starch paste because flocculation occurs above 8.5. It should not be combined with amine-based additives or metallic acid salts that force pH outside the 3.5–8.5 range. Incoming inspection should measure solids and viscosity before dilution; solids drift of ±0.5 % around the nominal value can produce viscosity shifts of approximately ±1,500 mPa·s, which is enough to alter transfer roll pickup on a high-speed line. If viscosity exceeds 12,000 mPa·s, dilution must be calculated from the measured batch solids value, not from the nominal specification, to avoid over-dilution. Filtration of recirculated adhesive through 100–200 µm screens reduces skinning particles and prevents score-line defects. Published performance data for spirally wound tubes using this specific designation under ISO 11093 flexural and crush test protocols is limited; commercial qualification must be run on the intended mandrel, paper, coating head, adhesive, and downstream slitting speed.
