400mm Continuous and Intermittent Gap Coating Machine

Product Overview

This system is a precision electrode coating line for lithium-ion battery manufacturing and development work. It applies prepared slurry uniformly onto foil substrate, then dries and rewinds the coated web to prepare it for downstream processing. A coordinated unwinding section, coating section, electric-heated oven, traction section, rewinding section, and electrical control system support a continuous material path from incoming roll to finished coated roll. The 400 mm roller-face width provides a practical format for controlled laboratory, pilot, and process-development electrode production.

The equipment supports both continuous coating and intermittent gap coating for positive and negative electrode sheets. It is intended for aluminum-foil cathodes using lithium iron phosphate, ternary, and similar material systems, as well as copper-foil graphite anodes. It is suitable where coating width, coating mass, dry thickness, web transport, and roll preparation must remain within the defined process range before subsequent cell fabrication operations.

Built around dedicated unwind, coating, drying, traction, and rewind functions, this unit provides an organized production sequence for demanding electrode work. The single-layer, electrically heated drying zone is integrated with controlled roll-to-roll handling, while single-position manual roll change arrangements keep the equipment configuration clear for operators. Extrusion coating configuration can be customized to suit the user's process requirements.

Key Features

• Continuous and Intermittent Gap Coating: The equipment supports continuous coating and intermittent gap coating for both cathode and anode electrode sheets. This gives process teams one platform for producing continuously coated webs and patterned coated sections used in cell-electrode preparation.

• 400 mm Roller-Face Platform: A 400 mm roller-face width supports substrate widths from 100 to 320 mm. This format accommodates electrode development and production tasks while retaining sufficient allowance for controlled web guidance and roll handling.

• Defined Electrode Coating Window: Maximum coating width is 300 mm for both electrode types, with single-side dry coating thickness from 50 to 250 µm. Cathode coating mass is specified at 100 to 250 g/m², while anode coating mass is specified at 80 to 200 g/m².

• Integrated Electric-Heated Drying: The oven uses electric heating and has one single-layer section measuring 2 m per section, for a total oven length of 2 m. Maximum oven temperature is 140℃, supporting the drying stage between wet slurry application and rewinding.

• Matched Unwind and Rewind Capacity: Both the unwind and rewind units accept rolls up to φ200 mm diameter and 100 kg maximum load. The same capacity at both ends of the line helps maintain a consistent roll-to-roll workflow from substrate supply through finished-web collection.

• Multi-Core Roll Compatibility: The unwind and rewind systems accept 3-inch internal-diameter cores, approximately 76.2 mm, with roll length no greater than 450 mm. Metal, ABS plastic, and paper cores are supported, allowing the unit to work with the listed common roll-core materials.

• Controlled Web Transport Architecture: A dedicated traction unit is positioned within the overall line configuration. Together with the unwind and rewind sections, it supports movement of aluminum or copper foil through coating and drying operations before the material is collected.

• Application-Specific Slurry Ranges: The process envelope covers cathode slurries based on lithium iron phosphate, ternary materials, and similar systems in NMP, plus graphite anode slurries in DI-Water. Specified solids content, density, and viscosity ranges establish clear input conditions for process planning.

• Customizable Extrusion Coating Configuration: The extrusion coating machine can be customized according to user requirements. This allows buyers to align the coating configuration with their material system and process needs while retaining the referenced line structure and operating ranges.

Applications

Technical Specifications

Substrate acceptance note: Aluminum foil or copper foil used during acceptance shall be free from slackness, uneven thickness and weight, surface oil contamination, or other conditions that affect web transport and coating performance.

Slurry consistency notes: For the same slurry batch, solids-content fluctuation shall be ≤±0.5%. For the same slurry batch, viscosity fluctuation shall be ≤±500mPa.s at 25±2℃.

Coating process notes: Coating speed is related to product characteristics, including material system, coating thickness, solids content, and temperature. The maximum coating speed stated in the table may not meet special coating-process requirements. Minimum gap length is 5mm at a coating speed ≤5/min. Minimum coating length is 30mm at a coating speed ≤5/min.

Why Choose This Product

• Complete Process Configuration: The unit combines unwinding, coating, electric drying, traction, rewinding, and electrical control in a defined line architecture, helping buyers specify a coherent electrode-coating process rather than isolated equipment functions.

• Process-Relevant Operating Data: Separate specifications are provided for cathode and anode substrate, slurry, coating mass, and material conditions. This makes it easier for procurement and process teams to compare the equipment against the intended electrode system.

• Practical Roll-to-Roll Capacity: Matched 100 kg maximum load capacity, φ200 mm maximum roll diameter, and supported 3-inch core formats on both unwind and rewind sides provide a consistent basis for material handling.

• Flexible Electrode Format Support: Continuous and intermittent gap coating, together with defined coating-width and dry-thickness ranges, supports varied positive- and negative-electrode sheet requirements within the listed process envelope.

• Customizable Extrusion Coating: The extrusion coating configuration can be customized according to requirements, enabling the equipment selection to be aligned with the buyer's coating process and material system.

Contact us for a quote or a custom extrusion coating solution matched to your lithium-ion battery electrode process requirements.

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