Dual-Mode Battery Electrode Coating Machine (Slot Die & Transfer)

Dual-Mode Battery Electrode Coating Machine (Slot Die & Transfer) for Battery R&D and Pilot Line

What is a Dual-Mode Coating Machine?

Most pilot lines and R&D labs face a recurring problem: the slurry that coated perfectly on a slot-die head last week won't stabilize this week because the formulation changed, the solid content drifted, or the batch viscosity landed outside the die's sweet spot. You either fight the meniscus all day or switch to a different machine.

The TOB-JYZY-350-4.5 solves this by housing two distinct coating methods on a single chassis:

• Slot Die Coating: Precision metering via servo-driven progressive cavity pump. Best for low-to-medium viscosity NMP-based NMC, LCO, or LFP cathodes where weight variation must stay below ±1.5%.

• 3-Roll Comma Transfer Coating: Gap-controlled metering via precision-ground comma bar. Best for high-viscosity aqueous graphite or Si-C anodes where slot die bead stability breaks down.

You switch between the two mechanically. No software gimmicks. The slot die head retracts, the transfer roll assembly locks in, and you dial in the comma bar gap with micrometer heads. Changeover takes under 90 minutes with a trained operator.

Slot Die vs. Transfer Coating: When to Use Which

Key Value Summary (For Procurement and Engineering Leads)

• One capital equipment line item covers two coating technologies. No need to budget for separate slot die and comma transfer coaters.
• Intermittent pattern alignment within ±1.0 mm length, ±0.5 mm width. Photo-sensor edge tracking automatically aligns front and reverse side patterns. No manual jog-and-pray during double-side coating.
• Hard chrome-plated coating roll and ground comma blade. Both held to ≤ ±1.5 µm radial runout and straightness. This is the mechanical foundation for the ±3 µm coating accuracy spec.
• 3-zone independent drying with analog SCR heating. 4.5 meters total oven length. Upper and lower air impingement nozzles prevent surface crusting on thick electrodes.
• Built for low-humidity cathode rooms. Coating head area spec'd for ≤35% RH. Rollers anodized, hardware sealed against NMP vapor creep.

Case Context: Pilot line for high-energy-density NMC811 cathode (NMP solvent) and aqueous graphite anode on 10 µm Cu foil.

Data collected from TOB customer site (Southeast Asia pilot facility) during commissioning of a TOB-JYZY-350-4.5 unit. Substrate: 12 µm Al foil for cathode, 10 µm Cu foil for anode. Measurements taken per internal TOB QA protocol over 500 meters continuous coating.

Applications 

• Pilot Scale Li-ion Battery Production: NMC, LFP, LCO, LMO cathodes; graphite and Si-C anodes.
• Sodium-Ion Battery Development: Na-ion cathode slurries up to 12,000 mPas.
• Solid-State Electrolyte Coating Trials: High-solid-content (20–85%) slurries with NMP or water.
• Supercapacitor Electrode Coating: Thin-film precision on aluminum substrates.
• Functional Film R&D: Any application requiring precise wet-film deposition on flexible metal foils.

Technical Specifications

FAQ

Q1: How long does it actually take to switch between slot die and comma transfer mode?

A: With an experienced operator, the mechanical changeover takes roughly 45 to 90 minutes. That includes retracting the slot die head, locking in the transfer roll assembly, and dialing in the comma blade gap via the micrometer heads. The PLC recipe swap for tension and speed parameters is immediate. The limiting factor is cleaning the slot die lip if you've been running NMP-based slurry—that's the real time sink, not the hardware swap.

Q2: The spec says ±3 µm coating accuracy. Is that achievable on 8 µm aluminum foil without wrinkling?

A: Yes, provided your unwind tension profile is dialed in correctly. The critical variables are the dancer roller feedback loop and the rubber backing roll hardness. On 8 µm Al foil, you run lower nip pressure on the EPDM roll and keep unwind tension at the low end of the range (typically 5-8 N). Wrinkling usually traces back to a misaligned guide roller or a dirty idler bearing, not the coating head geometry. The machine holds ±3 µm on foil down to 8 µm if the substrate has consistent caliper.

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 Email : tob.amy@tobmachine.com

 Phone number :+86-18120715609