Vacuum box with variable stage volume to improve coating uniformity

Claim 1

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 2

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 3

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber the low pressure chamber (16) and the vacuum chamber (17) are connected with each other via a bypass (51), further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 4

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber the low pressure chamber (16) and the vacuum chamber (17) are connected with each other via a bypass (51), further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 6

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction and a guide face (28) concentric to the casting roll (1) on which the partition (25) and/or the end wall (26) can be adjusted and the bottom of the housing is a partially cylindrical disk (27) concentric to the casting roll (1) which forms the guide face (28).

Claim 7

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction and a guide face (28) concentric to the casting roll (1) on which the partition (25) and/or the end wall (26) can be adjusted and the bottom of the housing is a partially cylindrical disk (27) concentric to the casting roll (1) which forms the guide face (28).

Claim 10

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber the partition (25) and/or the end wall (26) is formed by a plate provided on the front side with a circle segment (29 to 32) and rest with both front sides against a side wall (21 to 24) fixed on the housing, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 11

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber the partition (25) and/or the end wall (26) is formed by a plate provided on the front side with a circle segment (29 to 32) and rest with both front sides against a side wall (21 to 24) fixed on the housing, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction.

Claim 13

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction and having clamping devices (35, 36) securing the position of the partition (25) and/or the end wall (26) and screws penetrate through the circle segments (29 to 32) and are in clamped contact with the adjacent side walls (21 to 24).

Claim 14

An apparatus for the application of at least one cast layer on a moving sheet-shaped substrate comprising, in combination, a rotating casting roll which guides the substrate, a pouring vessel having at least one discharge slot for liquid casting material, which vessel is positioned adjacent to the casting roll while leaving a casting gap, and a suction device adjacent the casting roll, which functions to draw off air entrained by the moving substrate, said suction device being in the form of a curved box wherein the top and bottom of the box each lies in a plane concentric to the casting roll, said box having a housing, a low pressure chamber and a vacuum chamber in said housing, and a partition between chambers, the low pressure chamber extending in circumferential direction from the gap to the partition, and the vacuum chamber extending from the partition to an end wall provided with extensions running along the front sides of the low pressure chamber, further characterized in that the partition (25) and/or the end wall (26) can be adjusted in circumferential direction and having clamping devices (35, 36) securing the position of the partition (25) and/or the end wall (26) and screws penetrate through the circle segments (29 to 32) and are in clamped contact with the adjacent side walls (21 to 24).