On a corrugator wet-end roll stand, where containerboard is fed into single-facer nip rolls and roll changes are performed without stopping the web, the splicing tape is subjected to a simultaneous combination of peel, shear, and transient thermal load. The 3M 9578 polyester carrier is typically cut into tabs positioned across the web edge, with a 30 mm overlap joint placed approximately 15 mm behind the leading edge to maintain roll continuity after a flying splice. On 2.5 m wide corrugators running at 180 m/min to 250 m/min, edge-lift defects commonly occur when splice tabs are terminated square to the web edge; angled or chevron tail profiles reduce peel initiation along the outermost 50 mm of the tab. Under these conditions, web tension in heavyweight linerboard can exceed 1.2 N/mm, and the adhesive must resist machine-direction shear without cohesive splitting or polyester carrier yield. The upper temperature limit is governed less by the polyester carrier, which remains dimensionally stable to approximately 200 °C, than by the acrylic adhesive’s shear performance at elevated temperature. At preheater drum surface temperatures of 160 °C to 190 °C and dwell times of 0.5 s to 1.5 s, the splice generally retains mechanical integrity; however, if a splice remains in contact with a stationary heated surface for more than 3 s, localized adhesive softening can produce edge ooze and contaminate corrugator rolls. From a waste-recovery perspective, the polyester film carrier is not repulpable, and splice remnants should be removed before broke is repulped; in OCC recycling operations, dry-end splices are commonly flagged for manual ejection to prevent furnish contamination. Mechanical test data for tape-to-linerboard adhesion is typically generated according to PSTC-101 or ASTM D3330/D3330M-04, while shear adhesion failure temperature is evaluated using a modified ASTM D3654 procedure with a 1 kg load. Restricted-substance compliance is commonly verified against EU RoHS 2011/65/EU and REACH Article 33 disclosure obligations for substances of very high concern.

Biaxially oriented polypropylene and polyester film splicing in adhesive lamination lines

Adhesive lamination lines processing biaxially oriented polypropylene and polyester films at 200 m/min to 350 m/min require splice joints that do not create a caliper step greater than the combined thickness of the two film webs by more than approximately 0.12 mm. 3M 9578 is applied as a double-coated polyester carrier between the expiring web and the new film web, with overlap length commonly set at 20 mm to 25 mm for film thicknesses from 12 µm to 50 µm. In practice, corona-treated BOPP with surface tension of 38 dyn/cm to 42 dyn/cm yields adequate wet-out at room temperature; untreated film below 34 dyn/cm often exhibits peel forces below 1 N/cm and may require an additional corona discharge pass before splice application. The dominant process risk is web flutter in the unwind accumulator during flying splices; if the splice tab is not pressed with a steel roller conforming to the roll surface, air entrapment can reduce initial adhesion and cause splice failure under rapid tension recovery. During lamination, the splice may be exposed to heated nip rolls at 60 °C to 80 °C, which is below the shear-failure range of the acrylic adhesive. Converters supplying food-contact flexible packaging must not rely solely on the tape datasheet for migration compliance; the finished laminate must be tested under Commission Regulation (EU) No 10/2011 and U.S. FDA 21 CFR 175.105, with specific attention to potential transfer of acrylic adhesive components through thin sealant films. Terminal structures include printed pouches, lidding films, and quad-seal bags, where splice remnants are typically detected by register control systems that respond to the thickness step at the splice point. A frequent production-line failure is telescoping of the new roll when the tail is not secured flush; this is corrected by cutting the splice tab at a 45° angle and centering the tape on the roll core rather than by increasing the number of tape layers.

During flatbed die-cutting of self-adhesive laminates at 80 m/min to 120 m/min with a laminated web thickness of approximately 0.18 mm, the splice is introduced by applying 3M 9578 to the face side of the expiring web and to the liner side of the incoming roll. Silicone-coated release liners present a low-energy surface with typical dyne levels of 24 dyn/cm to 28 dyn/cm, and published data for direct acrylic adhesion to this surface is limited; converters often position the tape so that one adhesive face contacts the paper facestock or film face, while the second adhesive face contacts the polyester carrier of the expiring splice rather than the silicone layer. The mechanical requirement is dominated by matrix stripping tension, which can fluctuate between 0.3 N/cm and 0.8 N/cm as waste matrix is pulled through stripping pins. Splice failure in this operation is rarely tensile; the predominant failure mode is peel at the leading edge caused by repeated flexing over stripping rollers with diameters below 25 mm. Under these conditions, the 3M 9578 polyester carrier provides sufficient stiffness to prevent the splice from folding into the anvil drum gap. For pharmaceutical labels, verification of adhesive components against EU Regulation (EU) No 2017/745 and USP <1661> may be required if the final label is part of a medical device or primary packaging system; the tape itself is not supplied as a medical-grade component and must be qualified by the converter. End products include clear film labels, pharmaceutical vial labels, and linerless label precursors, where splice quality directly determines web waste rates in automated labeling machines.

What limits splice durability in heatset web offset dryers?

Heatset web offset presses expose coated paper splices to hot air at 140 °C to 180 °C for approximately 0.8 s to 2.0 s, depending on press speed and dryer length, after ink application. The 3M 9578 acrylic adhesive is selected for this application because its polyester carrier resists shrinkage at temperatures that would plasticize unsupported vinyl or polypropylene carriers. The limiting factor is not carrier degradation but adhesive-to-paper bond weakening under moisture-driven loss of surface sizing. Coated papers with high surface porosity and low internal sizing absorb ink solvents and fount solution, and residual moisture at the splice interface accelerates adhesive peeling after the dryer, when web tension in the folder superstructure reaches 0.6 N/mm to 1.0 N/mm. On 16-page and 32-page commercial web presses, operators typically use a 25 mm double-sided splice with a 5 mm to 10 mm trailing-edge tape tab, and they avoid placing the splice in the center of the web where folder former stresses concentrate. Print defects attributable to splice failure include doubling, web breaks at the former, and ink build-up on the blanket caused by loose splice flaps. Press-side process capability evaluations recommend dynamic shear testing under temperature ramp rather than static room-temperature peel testing for qualifying splicing tapes; however, published data for this specific configuration is limited because press manufacturers often validate tape products under proprietary protocols. Compliance for printed matter distributed in Europe includes EN 71-3 heavy-metal migration limits for printed children’s products, which apply to the printed paper and not to the splicing tape, but brand owners may request absence of hazardous substances in all processing aids. Terminal articles include catalogs, magazines, and direct-mail products, where splices are removed by the forced waste diverter at the delivery section.

Disposable hygiene converting machines running polypropylene spunbond and spunbond-meltblown-spunbond nonwovens at 300 m/min to 600 m/min perform roll changes on the fly through accumulator systems, and 3M 9578 is applied to splice polypropylene nonwoven webs of basis weight 12 g/m² to 25 g/m². These webs are highly extensible and prone to necking under unwind tension above 0.5 N/cm, so the splice joint overlap is typically kept at 15 mm to 20 mm; thicker overlaps create a detectable bulk step in chassis ear or topsheet sections and cause registration errors during cut-and-place operations. A production bottleneck observed on high-speed diaper lines is tape flagging at the edges of low-basis-weight nonwovens when the splice is not centered; subsequent passage through ultrasonic bonders can melt exposed adhesive and contaminate the horn or anvil. Process operators therefore set the tape edge back at least 10 mm from the nonwoven web edge and use a full-width nip station to consolidate the adhesive-to-fiber bond before the splice enters the accumulator. Relevant mechanical tests include loop tack per ASTM D6195 and dynamic shear per ASTM D3654, but these tests do not fully replicate the low surface energy and viscoelastic creep of polypropylene nonwoven. Unlike paper-based corrugating and publishing, this downstream sector has no repulpability requirement; the splice remnant is ejected as process waste. If the nonwoven is used in medical face masks or surgical drapes, the finished converter must evaluate biocompatibility under ISO 10993-5, but the splicing tape is not intended to remain in the finished medical device. Terminal products include hygienic article chassis, acquisition layers, and elastic ear laminates, where splice failures cause immediate line stoppage and material waste.

When vacuum web coating stations demand particulate-free splices on aluminum foil

Vacuum metallizing and roll-to-roll coating of aluminum foil or metallized films require splice surfaces that do not outgas, shed fibres, or lift under low-pressure processing. At unwind stations operating at 10⁻² mbar to 10⁻³ mbar, the 3M 9578 polyester film carrier exhibits no measurable outgassing under standard process conditions, but the adhesive’s outgassing behaviour must be qualified by chamber-specific residual gas analysis when the splice is not covered by a new deposition layer. For aluminum foil of 6 µm to 12 µm thickness, the splice joint is prepared as a butt splice with a single-side tab placed on the non-coated side; the 3M 9578 carrier thickness of approximately 0.12 mm can produce a local step that influences plasma pretreatment uniformity near the splice. Coaters address this by placing the splice outside the plasma treatment zone or by scheduling roll changes during target changes. Because aluminum foil lacks the porous structure of paper, adhesion is governed by surface oxide morphology and the absence of rolling oils; a wipe with isopropanol or methyl ethyl ketone is often specified before tape application, and peel strength on clean foil is measured using ASTM D3330 at 180° peel angle. In food-contact barrier laminates, the relevant compliance standard is again EU No 10/2011 or 21 CFR 175.105, but for vacuum coating operations the tape must also be free of silicone release agents that could poison the metallization chamber. Published data for this specific configuration is limited because vacuum coating is a proprietary process with varying plasma conditions; the converter must conduct a chamber compatibility test by placing a splice in a blank run and measuring pressure rise and optical density of the first 100 m of coated foil. Terminal articles include high-barrier packaging films, capacitor films, and solar backsheet materials, where splice remnants are marked by an optical splice detector to prevent inclusion in critical dielectric or barrier layers.

In lithium-ion electrode roll-to-roll coating lines, copper foil of 6 µm to 10 µm thickness and aluminium foil of 12 µm to 20 µm thickness are spliced before entering slot-die coating heads and drying ovens operating at 110 °C to 130 °C. The 3M 9578 tape is used to splice current collector foils where a butt splice with a 20 mm to 25 mm overlap provides sufficient tensile continuity under unwind tension up to 0.4 N/cm. The primary compatibility concern in this sector is chemical exposure to N-methyl-2-pyrrolidone during cathode slurry coating; acrylic adhesives can lose bond strength if the splice is wetted by solvent during edge overflow or start-stop sequences. Converters therefore place splices outside the slurry coating zone or shield the splice with a solvent-resistant single-sided tape, and they inspect splice integrity after the first drying zone using optical splice detectors. Published data for this specific configuration is limited because electrode manufacturers qualify splicing tapes under internal adhesion and solvent-exposure protocols, not solely by published datasheet values. Compliance for the finished cell requires verification of processing aids under IEC 62660-3 or UN 38.3 transport testing standards, but the splicing tape itself is removed before final cell assembly and is not present in the finished electrode stack. Terminal products include coated cathode and anode roll stock for lithium-ion cells, where splice failures can cause coating defects, electrode thickness variation, and winder damage if the splice is not detected before the slitting section.