Multi-slot die coater

1. A multi-slot die coater comprising:

a lower slot and an upper slot;

a lower die block;

an intermediate die block disposed above the lower die block to form the lower slot therebetween; and

an upper die block disposed above the intermediate die block to form the upper slot therebetween,

wherein at least one of the lower die block, the intermediate die block, and the upper die block comprises a metal coating layer on a ceramic body, and

wherein the multi-slot die coater is configured to extrude and apply a coating solution on a surface of a continuously traveling base member through at least one of the lower slot and the upper slot,

the metal coating layer is disposed on an inner portion of at least one of the lower and upper slots to at least partially contact the coating solution, and

the metal coating layer entirely covers a land of at least one of the lower and upper slots.

2. The multi-slot die coater of claim 1 ,

wherein a groove is formed in the ceramic body adapted for bolt tap processing for bolt fastening, the metal coating layer is filled in the groove, and a bolt tap is formed in the metal coating layer filled in the groove.

3. The multi-slot die coater of claim 1 ,

wherein the lower die block, the intermediate die block, and the upper die block respectively comprise a lower die lip, an intermediate die lip, and an upper die lip forming front end portions thereof, and at least one of the lower die lip, the intermediate die lip, and the upper die lip comprises the metal coating layer on the ceramic body.

4. The multi-slot die coater of claim 1 , wherein the ceramic is a transition metal oxide and the metal is SUS.

5. The multi-slot die coater of claim 3 , wherein a corner portion of the upper die lip opposed to the intermediate die lip is chamfered.

6. The multi-slot die coater of claim 5 , wherein the corner portion of the upper die lip is provided in a shape cut obliquely at an angle of 10 degrees to 80 degrees from a horizontal plane so that the upper die lip comprises an inclined surface.

7. The multi-slot die coater of claim 1 , wherein an angle formed by the lower slot and the upper slot is 30 degrees to 60 degrees.

8. The multi-slot die coater of claim 1 ,

wherein the intermediate die block comprises a first intermediate die block and a second intermediate die block in face-to-face contact with each other up and down and sliding along a contact surface to be movable relative to each other, and

wherein the first intermediate die block is fixedly coupled to the lower die block, and the second intermediate die block is fixedly coupled to the upper die block.

9. The multi-slot die coater of claim 1 ,

wherein the lower die block, the intermediate die block, and the upper die block respectively comprise a lower die lip, an intermediate die lip, and an upper die lip forming front end portions thereof, a lower discharge port communicatively connected to the lower slot is formed between the lower die lip and the intermediate die lip, and an upper discharge port communicatively connected to the upper slot is formed between the intermediate die lip and the upper die lip, and a predetermined step is formed between the lower discharge port and the upper discharge port.

10. The multi-slot die coater of claim 1 , further comprising:

a first spacer interposed between the lower die block and the intermediate die block configured to adjust a width of the lower slot, and

a second spacer interposed between the intermediate die block and the upper die block configured to adjust a width of the upper slot.

11. The multi-slot die coater of claim 1 ,

wherein the lower die block comprises a first manifold configured to accommodate a first coating solution and communicatively connected to the lower slot, and the upper die block comprises a second manifold configured to accommodate a second coating solution and communicatively connected to the upper slot.