Choke bar slot die and slurry coating apparatus including the same
The present invention relates to a slot die with a structure in which a stripe shim and a cover shim are mounted between an upper body and a lower body, and a choke bar is inserted into a through path formed in the upper body, and an apparatus for coating an electrode slurry including the slot die. According to the present invention, by forming a space in which the choke bar can move by the cover shim, it is possible to adjust the flow rate of the slurry through the choke bar regardless of the shape of the stripe shim.
1. A slot die comprising:
a slit-shaped discharge port in which a length of a discharge passage in a width direction based on a cross section of the discharge port is greater than a thickness perpendicular to the width direction,
a lower body configured to form a lower surface of the discharge passage;
an upper body configured to form an upper surface of the discharge passage, the upper body being disposed opposite the lower body to determine the thickness of the discharge passage and to have a slit-shaped through path formed in the width direction;
a stripe shim configured to be positioned on the discharge passage of the slot die and to divide the discharge port in the width direction;
a cover shim configured to be located on the stripe shim and to include a through hole formed in a central part; and
a choke bar configured to open and close a part of the discharge passage of the slot die while moving in a direction perpendicular to the discharge direction through the through path of the upper body,
wherein the discharge direction is a direction in which a slurry is configured to be discharged through the discharge port,
wherein the choke bar is perpendicular to the discharge direction along its longest axis,
wherein the slit-shaped through path extends from an opening in an outer surface of the upper body to the upper surface of the discharge passage, and
wherein an end of the choke bar is configured to travel along the slit-shaped through path from the opening in the outer surface of the upper body to the discharge passage.
2. The slot die of claim 1 , wherein a width direction length of the through path formed in the upper body corresponds to a width direction length of the choke bar.
3. The slot die of claim 1 , wherein a length in a discharge direction of the through path corresponds to a length in a discharge direction of the choke bar.
4. The slot die of claim 1 , wherein N choke bars are arranged in the discharge direction and N is an integer of 2 or more.
5. The slot die of claim 4 , wherein a discharge direction length of the through path formed in the upper body corresponds to a sum of discharge direction lengths of the N choke bars.
6. The slot die of claim 1 , wherein the lower body has an internal space recessed in a concave shape to accommodate the slurry.
7. The slot die of claim 1 , wherein the stripe shim is a plate material in which its center is empty and an outer peripheral portion of its discharge port is open.
8. The slot die of claim 7 , wherein the stripe shim has a bar-shaped partition wall for dividing the discharge port into a plurality of regions in the width direction (TD), the partition wall protruding toward the open outer periphery.
9. The slot die of claim 8 , wherein there the partition wall is present in an integer of 1 or more, and
wherein the discharge passage of the discharge port is divided into n+1 units in the width direction by the partition walls.
10. The slot die of claim 1 , wherein the cover shim has a plate-shaped structure, and shares the stripe shim and the discharge passage, and
wherein a length of the cover shim in the width direction corresponds to a length of the discharge passage in the width direction.
11. The slot die of claim 1 , wherein a thickness of the cover shim is in a range of 20 to 80% of the thickness of the discharge passage.
12. The slot die of claim 1 , wherein a thickness ratio of the stripe shim and the cover shim is 3:1 to 1:3.
13. The slot die of claim 1 , wherein the cover shim faces the upper body, and the stripe shim faces the lower body.
14. The slot die of claim 1 , wherein a length of the through hole formed in the cover shim in a width direction is the same as a length of the through path formed in the upper body in a width direction, and
wherein a discharge direction length of the through hole formed in a cover core is greater than or equal to a sum of a discharge direction length of the through path and a discharge direction length of an internal space.
15. An apparatus for coating an electrode slurry comprising a slot die according to claim 1 .