Below are three typical coating methods.

■Micro gravure method
【Advantages】
・Suitable for low viscosity slurry, and it is possible to coat even ultra-low viscosity materials of 50 cps or less.
・The coating results are more stable, due to less wrinkle because of no back roll is used.
・Coating thickness can be changed simply by just changing a gravure mesh and the rotation speed.
・Excellent maintainability (only cleaning gravure roller and liquid pans)

【Disadvantage】
・ It is necessary to pay attention to changes in the state of the slurry due to the open air environment.

Recommend : Over coating onto Positive/Negative electrode. R&D.

■Slot die method
【Advantages】
・Slurry is not exposed (called closed method), the contamination is very low.
・Less change in concentration and viscosity at the start and end of coating.
・Coating availability to wide range of film thicknesses and viscosities.
・It is available to Intermittent coating since liquid feeding can be controlled. (Right figure)

【Disadvantages】
・Slot dies are relatively expensive and requires long delivery times.
・スMaintenance and cleaning of slot dies requires skill and time.

Recommend: Positive/Negative electrode coating.

■Roll knive method
【Advantages】
・Can be used with high viscosity slurry
・Easy to handle, easy to coat with a stable coating thickness.
・Highly versatile coating method and it can be used for a wide range of applications.

【Disadvantage】
・It is necessary to pay attention to changes in the state of the slurry due to the open air environment.

Recommend: Positive/Negative electrode with high viscosity . R&D

How to select a coating method?
As a guideline, each coating method has its own strengths in film thickness and viscosity.
For your reference, we show the covered range of the three types of coating methods below.
There are over 20 types of coating methods, we will propose the most suitable coating method according to your request.

There are many options for drying methods. Depending on the slurry, they may be used in combination.

We also handles many of the ancillary equipment required for coating machines.
Corona treatment machine, UV irradiation machine, X-ray thickness measurement system, visual inspection equipment, static eliminator, etc...

There are many combinations of coating machines, selection work is extremely difficult.
Please feel free to ask us for help with your selection and support.