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Advanced Extrusion Coater for High Quality Coating

Extrusion coater

Advanced Extrusion Coater for High Quality Coating

Advanced Extrusion Coater for High Quality Coating

  • Width of roll surface 450/650/800/1000/1200/1400/1600 mm
  • Mechanical speed Max.150m/min
  • Coating speed Max.100m/min (Positive electrode) Max.120m/min (Negative electrode)
  • Steel roll runout ≤ 1.2 μm (laser meter)
  • Tension control accuracy ≤±2N
  • Lateral wind speed fluctuation of tuyere ≤±2%
  • Positive and negative dislocation: ≤±0.2mm
  • Coating accuracy ≤±1.0% (Single-sided density) ≤±0.8% (Double-sided density)
  • Unwinding/winding diameter Max.800mm (unwinding) Max.1200mm (winding)
  • Oven configuration 2/3/4/5m/ section, full-arch oven structure, single-section oven equipped with full driving roller.
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Extrusion Coater

Extrusion coater is used to coat the functional layer of foil for lithium ion battery, and the anode and cathode slurry are evenly coated to the pole piece, so that the appearance, size and area density are within the design specification range, and then are rolled up after drying to prepare for the post-process. The coating met hod is continuous coating, gap coating, etc., which has the function of coating ceramics on the edge of the positive plate. According to the customer's coating process, the equipment with different roll width and oven length can be matched for single-sided and double-sided coating. Using slit extrusion coating, the precision of single-side density of pole piece is ≤ ± 1.0%, and the precision of double-side density is ≤ ± 0.8%. Double closed-loop tension control, the tension swing roller adopts low friction cylinder, and the tension fluctuation is ≤ ± 2N; A new type of coated steel roll shaft core is forged integrally to improve the mechanical properties, and the steel roll jump is ≤1.2μm (laser table); Through-shaft DDR motor (kollmorgen) is directly driven, and the linear speed fluctuation is ≤± 3‰; The arch type full main drive oven can be compatible with 4.5μm thin substrate coating.

Equipment advantages

Extrusion Coater

1. Adopt double gas path inflatable mechanical chuck, to avoid the problem that the traditional single gas path chuck retracts after it rises, and to avoid the coil falling.

2. The double guide arm structure is adopted to replace the telescopic shaft guiding mode, which has the advantages of wear resistance, strong bearing capacity and high reliability.

3. Double-pump parallel feeding adopts A\B screw pump peak and trough contraposition design, which can improve the stability of coating pressure and thus improve the consistency of area density.

4. Put the B-face machine head on the independent platform on the second floor and disconnect it from the steel platform at the tail, thus effectively avoiding the influence of the vibration of the tail platform on the coating accuracy; Cancel the climbing mechanism to eliminate the risk of climbing and wrinkling.

5. Professional fluid analysis and design, independent return air cavity design, solve the problems of uneven drying, curling and overdrying on both sides and middle area of the pole piece.

6. Oven fluid simulation, specially designed pressure relief nozzle structure+multistage pressure equalizing cavity, the lateral wind speed fluctuation of a single nozzle is ≤ ± 2% (measured), which improves drying consistency and reduces the risk of pole piece deviation in the oven.

7. The industry has established 1600-wide high-speed all-infrared ultra-high-precision extrusion coating machine is compatible with 4um copper foil and 6um aluminum foil, full-arch oven design, driving roller magnetic wheel drive, maintenance-free, high stability, high-speed coating without curling, cracking, wrinkling and other problems.

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FAQS

1. Q: How to deal with the machine failure of coating machine?

A: Various failures will occur in the process of extrusion coating machine, such as machine stop, oil leakage, damage and so on. The solution is to check whether the machine parts are damaged or missing, keep the machine clean and dry, regularly check whether the machine parts are normal, and adjust the running state of the machine in time.

2. Q: How to deal with abnormal weight of extrusion coating?

A: When the weight of extrusion coating is abnormal, it may be caused by the following reasons: 1. The rheological properties of coating materials are unstable; 2. Equipment failure: Extrusion coating equipment may have faults in use, such as poor operation of extruder and blockage of coating head. 3. Improper operation: Improper operation by operators during extrusion coating, such as too fast or too slow coating speed and improper distance between coating head and substrate, may lead to abnormal extrusion coating weight.

3. Q: What are the methods of coating machine for lithium ion batteries?

A: Suitable for lithium batteries are the following two: 1. Transfer coating, also known as roll coating; Extrusion coating, also known as spraying.

4. Q: What is a pole piece coater?

A: The pole piece coating machine is a coating machine used in the field of slurry coating for positive and negative poles of lithium batteries. In the front-end process of lithium battery production, the pole piece is an important manufacturing link, and the uniformity of slurry coating on the surface of the base metal current collector foil of the positive and negative pole pieces directly affects the stability and safety of lithium battery operation. Therefore, the pole piece coating machine is one of the key equipment in lithium battery production equipment, and compared with other coating machines, the industry has higher technical barriers.

5. Q: How to maintain the lithium battery coating machine?

A: 1. Check the screws of all parts of the coating machine packaging machine regularly to avoid looseness. 2. Pay attention to the waterproof, moisture-proof, anti-corrosion and rat-proof of the electrical parts of the coating machine. The inside of the electric control box and the terminal should be kept clean to prevent electrical failure. 3. After shutdown, the metering part should be cleaned in time to ensure that the material tray and turntable are cleaned in each shift to prevent them from corrosion. Regularly clean the dust in the electric cabinet to prevent poor contact and other failures, and so on.

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