Cigarette Glue JZ-II VAE Emulsion

When 10,000–12,000 Cut Rods per Minute Pass Through the Garniture Folding Tunnel

On Hauni PROTOS-M5 and PROTOS-M8 cigarette makers running 10,000–12,000 cut rods/min with 24.3 mm circumference paper, the longitudinal lap seam is the most immediate adhesion boundary because the paper tube must hold a closed geometry before the garniture heater transforms the wet polymer film into a fibre-tearing bond. JZ-II VAE emulsion is pumped from a temperature-controlled reservoir at 18–25°C through a slit applicator with a 2.0–2.5 mm gap, depositing a wet film of 12–16 µm onto the cigarette paper edge. The dry coat is maintained between 3.0 g/m² and 4.2 g/m²; lower add-on causes intermittent seam opening when cut filler moisture exceeds 12.5%, while higher add-on produces a visible adhesive line and can alter the paper’s burn behaviour after the rod is dried. Production qualification measures open time by stepping paper speed in 50 m/min increments and testing seam burst immediately after the garniture outlet with a spring-loaded burst probe. The target open time for this grade is 0.8–1.2 s at 22±2°C and 55–65% RH; beyond 1.5 s, surface skinning becomes sufficient to reduce fibre penetration and create a weak boundary layer. The supplied solids content is typically 51–55% by mass according to ISO 3251:2019, and the Brookfield viscosity is 2,500–4,500 mPa·s at 25°C on spindle 4 at 30 r/min according to ISO 2555:2018. If viscosity reduction is needed, deionized water can be added up to 5.0 wt%; above that level the wet film becomes too mobile on low-porosity base paper and skip coat defects appear. Machinery cleaning cycle data from production lines show that hardened residue at the slit edge becomes a process bottleneck when the applicator head remains static for more than 20 min, so the operator program includes a wet purge cycle every 15–20 min during stoppages. The finished component is a sealed cigarette rod cut into 84 mm or 100 mm double-length rods that must survive tray unloading, sorting, and downstream tipping without adhesive transfer to the cutting drum or garniture folder.

On KDF-4 filter rod makers running plug wrap at 400–600 m/min and forming 16.8 mm, 19.0 mm, or 24.3 mm circumference rods, JZ-II VAE emulsion is delivered by positive-displacement gear pump to a wheel applicator or slit nozzle that coats one edge of the filter wrap before the folding tunnel closes around the cellulose acetate tow. The seam width is held at 1.5–2.0 mm for 16.8 mm rods and up to 2.2 mm for 24.3 mm rods because the larger circumference increases lap shear in the cooling drum and stack transport. Dry adhesive add-on is set at 2.0–3.0 g/m²; higher film weights are used only when the tow contains 6.0–8.0% triacetin by weight and the wrapper is a high-porosity plug wrap. Triacetin migration from the acetate tow is the main long-term failure mode in this application. The seam is inspected after 48 h conditioning at 40±2°C in a closed vessel containing triacetin vapour; the acceptance criterion is fibre tear over at least 80% of the opened seam length. JZ-II at this seam is generally not diluted below 50% solids because low-viscosity adhesive can be wicked into the plug wrap and starve the bond line before the folder closes. Application temperature is controlled from 18°C to 28°C; below 18°C the emulsion develops uneven bead edges, and above 28°C the open time drops below 0.4 s on lightweight plug wrap. pH is retained between 4.5 and 6.0 using the electrometric method in ISO 976:2013, and the dried seam is checked with a hand-held spring dynamometer for wrapper fibre pull. The downstream component is a dimensionally stable filter rod cut to 120 mm or 126 mm segments that can be transferred to a dual-filter combining line without seam split, curl, or adhesive build-up on the cutting knife.

What Limits Stringing on Pre-Perforated Tipping Webs at 900 m/min?

When pre-perforated tipping paper for ventilated cigarettes runs at 900 m/min through a cold glue transfer roller, the JZ-II VAE emulsion film must release cleanly from the applicator roller and must not be drawn into the perforation holes. Typical pre-perforated tipping stock carries 0.5–1.5 mm hole rows and air permeability above 200 CU measured by ISO 2965:2009. On production lines, the applicator slot is set between 180 µm and 240 µm; narrower slots accumulate mineral coating debris from the tipping paper and generate diagonal streak defects. The wet film is maintained at 10–14 µm, giving a dry coat of 2.2–3.5 g/m². This is lower than the rod paper lap seam because a thick tipping film migrates into the ventilation holes during the first 0.2–0.5 s after transfer and partially seals them, increasing ventilation coefficient variability. When the base paper is highly porous, deionized water is added up to 3.0 wt% to bring the Brookfield viscosity into the 1,800–2,800 mPa·s window at 25°C; above 3.0 wt% dilution, capillary wicking increases and the adhesive can penetrate the paper before the filter and tobacco rod are pressed together. The glued tipping paper wraps around the filter plug and tobacco rod under a compression force of 4–6 N/cm² for 20–40 ms, after which the bond must resist peel when the consumer wets the mouth end. End-product ventilation pressure drop is commonly 80–120 mmH₂O for this class of cigarette, and the retained hole openness is checked against the manufacturer’s inlet pressure-drop specification. Compliance documentation for this section references REACH EC 1907/2006 for SVHC content below 0.1 wt% per article and the lot traceability requirements of ISO 9001; where the tipping paper is exported to US cigarette converters, FDA 21 CFR 175.105 is listed as an indirect mouth-contact reference though cigarette papers are not food-contact articles.

During dual-segment and capsule filter assembly on Hauni KDF-2SE and G.D AF12 combining platforms, JZ-II VAE emulsion bonds the outer plug wrap over two pre-cut segments that may contain cellulose acetate, carbon paper, or flavour capsule wrapper film. The dry adhesive add-on is 2.5–4.0 g/m² on the outer plug wrap seam, and the seam passes through a heated forming tunnel at 60–80°C for 0.5–1.5 s. The main process failure in this configuration is intermittent delamination caused by skin formation at the bead edge; if the skin folds inward during tunnel entry, a weak line remains after the rod is cooled. To prevent this, the applicator wheel scraper gap is set at 100–150 µm and the emulsion is conditioned at 20±2°C. Spot inspection uses a 20 N spring-loaded seam opener, and the acceptance criterion is paper fibre tear on at least 80% of the opened seam area. The JZ-II film is not a solvent barrier, so menthol or flavour solvent loadings above 2.0% of segment weight are kept away from the seam edge to avoid adhesive softening. Regulatory documentation is generally limited to the tobacco manufacturer’s internal adhesive specification, plus REACH EC 1907/2006 and a heavy-metal screen using inductively coupled plasma optical emission spectrometry. The downstream output is a finished specialty filter cigarette that must survive automatic packing, transport, and mouth-end wetting without wrapper delamination or spot detachment.

Low-Ignition-Propensity Paper Interfaces and the Lap-Seam Residue Profile

Low-ignition-propensity paper uses printed or coated bands that reduce air permeability to below 10–20 CU under ISO 2965:2009, and the adhesive seam must not disturb the smoulder-rate response measured by ASTM E2187-20b. JZ-II VAE emulsion is applied to the edge of low-ignition-propensity paper at 3.0–4.0 g/m² dry; the film’s inorganic residue after combustion is controlled because a continuous ash skeleton along the glue line can hold the paper edges apart during smoulder and shift the char collapse pattern. Production audits burn conditioned cigarettes in a draft chamber at 21±2°C and 50±5% RH, then compare the glued seam residue against the unglued paper seam; the common specification is that the glued seam shall not exceed the unglued seam by more than 0.5 mg per 84 mm cigarette. If the residue exceeds this limit, the seam add-on is lowered within the 3.0–4.0 g/m² range or the seam is offset by 0.3–0.5 mm so that it lies outside the low-ignition-propensity band. This paper-contact application is not automatically covered by food-contact regulations, but Chinese cigarette converters sometimes reference GB 9685-2016 when the adhesive is evaluated as a tobacco-contact material. Where the converter imposes a packaging-grade metal screen under EU Packaging and Packaging Waste Directive 94/62/EC, the sum of lead, cadmium, mercury, and chromium(VI) is held below 100 mg/kg. The finished product is a low-ignition-propensity cigarette that passes the ignition strength test without opening of the lap seam during subsequent automatic packing.

Hinge-Lid Blank Side Seam Bonding at 350–450 Cartons per Minute

In final packing, JZ-II VAE emulsion is applied to preprinted hinge-lid blanks on high-speed folder-gluer lines running 350–450 cartons/min. The side seam panel receives a wet film of 60–100 g/m² because the board absorbs water quickly and the folded blank must remain closed during transfer to the knock-down tray and stack press. On coated carton board, the wet film is limited to 100 g/m² to prevent edge cockling; on uncoated recycled board, the same film weight produces fibre tear but can raise the board moisture by 2–3% absolute, so the stack is pressed at 0.5–1.0 bar for 10–20 min. The dried seam is tested after 24 h at 23±2°C and 50±5% RH using a hand-held spring dynamometer, and the expected failure mode is board fibre tear rather than cohesive film failure. This carton application is selected when the packing hall requires low odour and low VOC behaviour, because sealed case storage can amplify residual monomer or acetic acid odour in the packet. Compliance is under REACH EC 1907/2006 and EU Packaging and Packaging Waste Directive 94/62/EC; if the board contains recycled fibre, a migration cell is used to check mineral oil breakthrough into the dry adhesive film. The terminal product is a sealed hinge-lid blank that can be folded around finished cigarette bundles without reopening during downstream cellophaning, stamp tax application, or tray packing.