Coating device and coating method

1. A coating device comprising:

a die head including a supply port into which a coating slurry is supplied, a manifold that stores the coating slurry, and a slit that dispenses the coating slurry;

a supply pipe that is connected to the supply port of said die head; and

a cover plate that is provided in said supply port or said supply pipe and that reduces a flow rate of said coating slurry greater in a center than at a periphery of a cross-section that is orthogonal to a direction in which said coating slurry flows into said die head in said supply port or said supply pipe.

2. The coating device as set forth in claim 1 , wherein:

one end of said supply pipe is connected to said supply port and the other end is connected to a gate valve for switching between supplying and cutting off said coating slurry; and

said cover plate is arranged at a connection portion that is provided in said supply pipe or the interior of said supply pipe.

3. The coating device as set forth in claim 1 , wherein said cover plate comprises:

a frame-shaped edge portion provided along walls of a cross-section of said supply port or said supply pipe; and

two convex-shaped restraining plates that extend from said frame-shaped edge portion toward the center of the cross-section of said supply port or said supply pipe;

wherein:

said two restraining plates are arranged in linear symmetry with respect to a central axis that passes through the center of the cross-section of said supply port or said supply pipe; and

a first opening is formed in a region other than said frame-shaped edge portion and said two restraining plates in the cross-section of said supply port or said supply pipe.

4. The coating device as set forth in claim 3 , wherein said first opening is of a configuration in which a length along the walls of the cross-section of said supply port or said supply pipe is continuously smaller from a periphery toward the center of the cross-section of said supply port or said supply pipe.

5. The coating device as set forth in claim 3 , wherein second openings arranged in linear symmetry with respect to a central axis are formed in each of said two restraining plates.

6. The coating device as set forth in claim 5 , wherein a plurality of said second openings are formed in each of said two restraining plates.

7. The coating device as set forth in claim 3 , wherein each of said two restraining plates has a portion that is tilted toward said die head from the cross-section of said supply port or said supply pipe.

8. The coating device as set forth in claim 3 , wherein said cover plate is arranged in said supply port or said supply pipe such that a central axis thereof is parallel to a width direction of said slit.

9. The coating device as set forth in claim 1 , wherein said cover plate comprises:

a frame-shaped edge portion along walls of the cross-section of said supply port or said supply pipe;

a restraining plate that reduces the flow rate of said coating slurry in the center of the cross-section of said supply port or said supply pipe; and

a plurality of openings formed along said edge portion in periphery of said restraining plate.

10. The coating device as set forth in claim 1 , wherein an opening is arranged in a center portion in a width direction of said manifold, and said opening communicates with said supply port.

11. The coating device as set forth in claim 2 , wherein said cover plate comprises:

a frame-shaped edge portion provided along walls of a cross-section of said supply port or said supply pipe; and

two convex-shaped restraining plates that extend from said frame-shaped edge portion toward the center of the cross-section of said supply port or said supply pipe;

wherein:

said two restraining plates are arranged in linear symmetry with respect to a central axis that passes through the center of the cross-section of said supply port or said supply pipe; and

a first opening is formed in a region other than said frame-shaped edge portion and said two restraining plates in the cross-section of said supply port or said supply pipe.

12. The coating device as set forth in claim 11 , wherein said first opening is of a configuration in which a length along the walls of the cross-section of said supply port or said supply pipe is continuously smaller from a periphery toward the center of the cross-section of said supply port or said supply pipe.

13. The coating device as set forth in claim 4 , wherein second openings arranged in linear symmetry with respect to a central axis are formed in each of said two restraining plates.

14. The coating device as set forth in claim 13 , wherein a plurality of said second openings are formed in each of said two restraining plates.

15. The coating device as set forth in claim 4 , wherein each of said two restraining plates has a portion that is tilted toward said die head from the cross-section of said supply port or said supply pipe.

16. The coating device as set forth in claim 4 , wherein said cover plate is arranged in said supply port or said supply pipe such that a central axis is parallel to a width direction of said slit.

17. The coating device as set forth in claim 2 , wherein said cover plate comprises:

a frame-shaped edge portion along walls of the cross-section of said supply port or said supply pipe;

a restraining plate that reduces the flow rate of said coating slurry in the center of the cross-section of said supply port or said supply pipe; and

a plurality of openings formed along said edge portion in periphery of said restraining plate.

18. The coating device as set forth in claim 2 , wherein an opening is arranged in a center portion in a width direction of said manifold, and said opening communicates with said supply port.