WO2019227655A1 - Vertical extrusion coating head - Google Patents

Abstract

A vertical extrusion coating head, comprising a first coating lip (1) and a second coating lip (2), a gasket being disposed between the first coating lip (1) and the second coating lip (2); the gasket separates the first coating lip (1) from the second coating lip (2) to form a coating slit (3), and a material groove (31) that communicates with the coating slit (3) is provided on the first coating lip (1) or the second coating lip (2); a blocking piece (311) is provided on a side of the material groove (31) that is far from a coating material discharge port (32), and the blocking piece (311) blocks the material groove (31) to from the material discharge port (32) of the material groove. The vertical extrusion coating head may prevent trailing during coating and is suitable for vertical downward or oblique downward coating.

Description

Vertical coating pressure coating head Ranch

Technical field

The invention relates to an improvement of an extrusion coating head, in particular to a vertical coating pressure coating head.

Background technique

As shown in FIG. 1, a conventional extrusion coating head includes a first coating lip 100 and a second coating lip 200, and is provided between the first coating lip 100 and the second coating lip 200. A gasket, which separates the first coating lip 100 and the second coating lip 200 to form a coating slit 300, and applies one of the first coating lip 100 and the second coating lip 200 A lip 310 is provided on the lip, and the hopper 310 communicates with the coating slit 300. When the extrusion coating head is arranged horizontally or diagonally upward, the coating effect is still satisfactory. However, when the extrusion coating head is arranged vertically downward or obliquely downward, a tailing phenomenon occurs. The so-called tailing phenomenon is intermittent coating. When the coating is stopped in the middle, the slurry It cannot be stopped immediately, and there is a small smear coating phenomenon, which is not allowed in the intermittent coating process of lithium battery electrodes.

When the extrusion coating head is arranged vertically downward or obliquely downward, the main reasons for the tailing phenomenon are as follows: First, the slurry on the opposite side of the first coating lip 100 and the second coating lip 200 is opposite to the slurry. The second is the pressure of the slurry remaining in the hopper 300 on the slurry in the slit 400 when the coating is stopped. When the coating is stopped, if the pressure of the slurry on the slurry in the slit 400 is equal to or less than the resistance to the slurry on the opposite sides of the first coating lip 100 and the second coating lip 200, There will be tailing, and vice versa. Further analysis believes that the resistance of the opposite sides of the first coating lip 100 and the second coating lip 200 to the slurry is determined by two factors. The first factor is the relative relationship between the first coating lip 100 and the second coating lip 200. The smoothness of the surface. Of course, if greater resistance is required, the rougher the opposite surface of the first coating lip 100 and the second coating lip 200 is, the better. The second factor is the viscosity of the slurry. In the actual manufacturing process of the extrusion coating head, considering other coating effects during coating, such as coating uniformity, the more uniform the coating is, the better; during the coating process, the slurry layer to be coated should be No spots caused by air bubbles can occur. The opposite surface of the first coating lip 100 and the second coating lip 200 must be made with a higher finish. The viscosity of the slurry is constant for each slurry. It cannot be changed arbitrarily.

Therefore, the pressure of the remaining slurry on the slurry in the slit has a large effect on the tailing phenomenon during coating.

Summary of the Invention

Aiming at the above defects or improvement requirements of the prior art, the present invention provides a vertical coating pressure coating head which can prevent tailing during coating and is suitable for vertical downward or oblique downward coating.

The technical solution of the present invention is to provide a vertical coating and coating head, which includes a first coating lip and a second coating lip, and a pad is provided between the first coating lip and the second coating lip. Sheet, the spacer separates the first coating lip and the second coating lip to form a coating slit, and the first coating lip or the second coating lip is provided with a coating slit A communicating hopper; a blocking piece is provided on a side of the hopper that is far from the coating discharge opening, and the blocking piece blocks the hopper from the discharging hopper outlet.

As an improvement to the present invention, the baffle is directly processed from the first coating lip or the second coating lip.

As an improvement to the present invention, the blocking piece is formed by extending the gasket upward.

As an improvement to the present invention, a contact portion extending downward is provided on the first coating lip or the second coating lip away from the coating discharge port.

As an improvement to the present invention, the bottom surface of the contact portion is a flat surface or an arc surface.

The present invention adopts a structure in which a baffle is provided on a side of the hopper that is far from the coating discharge port, and the dam blocks the hopper from the discharge port of the hopper. When the present invention is temporarily closed During coating, the slurry can be temporarily stored in the hopper without forming pressure on the slurry in the slit. Therefore, the present invention has the advantages of being able to prevent smearing during coating and is suitable for vertical downward or oblique downward coating.

Brief description

1 is a schematic structural diagram of an embodiment of a conventional extrusion coating head;

FIG. 2 is a schematic structural diagram of a first embodiment of the extrusion coating head of the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of the extrusion coating head of the present invention;

FIG. 4 is a schematic structural view of a third embodiment of the extrusion coating head of the present invention.

Detailed ways

The present invention will be further described below with reference to specific drawings.

Please refer to FIG. 2. FIG. 2 discloses a first embodiment of a vertical pressure coating head of the present invention, which includes a first coating lip 1 and a second coating lip 2. A shim is provided between the lip 1 and the second coating lip 2, and the shim separates the first coating lip 1 and the second coating lip 2 to form a coating slit 3. The coating lip 1 or the second coating lip 2 is provided with a material groove 31 communicating with the coating slit 3; a side of the material groove 31 remote from the coating outlet 32 is provided with a blocking piece 311, so The blocking piece 311 blocks the material slot 31 from the material outlet of the material slot 312. In this embodiment, the blocking piece 311 is directly processed from the first coating lip 1 or the second coating lip 2. Obviously, the blocking piece 311 can also be designed to extend upward from the gasket, and the same effect can be achieved.

In the present invention, a blocking piece 311 is provided on a side of the material tank 31 remote from the coating outlet 32, and the structure of the material block 311 blocks the material tank 31 from the material outlet 312 of the material tank. When the invention temporarily suspends coating, the remaining slurry 4 can be temporarily stored in the hopper 31 without forming pressure on the slurry in the slit 3. Therefore, the present invention has the advantages of being able to prevent smearing during coating and is suitable for vertical downward or oblique downward coating.

Please refer to FIG. 3, which illustrates a second embodiment of a vertical pressure coating head of the present invention, which includes a first coating lip 1 and a second coating lip 2. A shim is provided between the lip 1 and the second coating lip 2, and the shim separates the first coating lip 1 and the second coating lip 2 to form a coating slit 3. The coating lip 1 or the second coating lip 2 is provided with a material groove 31 communicating with the coating slit 3; a side of the material groove 31 remote from the coating outlet 32 is provided with a blocking piece 311, The blocking piece 311 blocks the material slot 31 from the material outlet of the material slot 312. In this embodiment, the blocking piece 311 is directly processed from the first coating lip 1 or the second coating lip 2. Obviously, the blocking piece 311 can also be designed to extend upward from the gasket, and the same effect can be achieved.

In the present invention, a blocking piece 311 is provided on a side of the material tank 31 remote from the coating outlet 32, and the structure of the material block 311 blocks the material tank 31 from the material outlet 312 of the material tank. When the invention temporarily suspends coating, the remaining slurry 4 can be temporarily stored in the hopper 31 without forming pressure on the slurry in the slit 3. Therefore, the present invention has the advantages of being able to prevent smearing during coating and is suitable for vertical downward or oblique downward coating.

In this embodiment, a contact portion 11 is provided on the coating lip on the side remote from the discharge port 32, and the bottom surface 111 of the contact portion 11 is a curved surface structure. This design, when this embodiment is vertically downward When the coating is applied obliquely downward to the substrate, the bottom surface 111 of the contact portion 11 abuts against the front portion of the substrate in the advancing direction of the substrate. The slurry outlet 311 is suspended above the substrate, and the slurry outflow 311 flows out in a free state when being coated (that is, it is not affected by any extension of the traditional contact coating lip), and has the same effect as the non-contact coating In this way, the method of contact coating is used to achieve the purpose of non-contact coating effect (in the prior art, the effect of non-contact coating is better than the effect of contact coating).

Please refer to FIG. 4. FIG. 4 discloses a fourth embodiment of a curved-type pressure coating head according to the present invention. The embodiment shown in FIG. 4 is substantially the same as the embodiment shown in FIG. The bottom surface 111 of the contact portion 11 is a flat surface.

Those skilled in the art can easily understand that the above description is only the preferred embodiments of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

Claims (1)

1, A vertical coating and coating head includes a first coating lip (1) and a second coating lip (2). Between the first coating lip (1) and the second coating lip (2), A gasket is provided between the first coating lip (1) and the second coating lip (2) to form a coating slit (3). 1) or the second coating lip (2) is provided with a feeding trough (31) communicating with the coating slit (3); it is characterized in that the feeding trough (31) is far from the coating discharge opening ( A blocking piece (311) is provided on one side of 32), and the blocking piece (311) blocks the material trough (31) from the material outlet (312) of the material trough. 2, The vertical coating and coating head according to claim 1, characterized in that the blocking piece (311) is directly processed on the first coating lip (1) or the second coating lip (2). Made of. 3, The vertical coating and coating head according to claim 1, wherein the blocking piece (311) is formed by the gasket extending upward. 4, The vertical pressure coating head according to claim 1, 2 or 3, characterized in that: the first coating lip (1) or the second coating lip (2) is separated from the coating out The feed port (32) is provided with a downwardly extending contact portion (11). 5, The vertical pressure coating head according to claim 4, characterized in that the bottom surface (111) of the contact portion (11) is a flat surface or an arc surface.