CN209772575U

CN209772575U - Slit coating head

Info

Publication number: CN209772575U
Application number: CN201822030501.0U
Authority: CN
Inventors: 彭建林; 刘宗辉; 王精华
Original assignee: Shenzhen Manst Technology Co Ltd
Current assignee: Shenzhen Manst Technology Co Ltd
Priority date: 2018-12-05
Filing date: 2018-12-05
Publication date: 2019-12-13
Anticipated expiration: 2028-12-05

Abstract

The utility model provides a slit coating head, which comprises an upper die, a lower die and a gasket clamped between the upper die and the lower die, wherein the lower die is provided with a first lip edge part, the upper die is provided with a second lip edge part opposite to the first lip edge part, the lower die is provided with at least one first feeding channel, the upper die is provided with at least one second feeding channel, the gasket is provided with at least one opening and at least one groove, a first slit channel is formed among the upper die, the opening and the lower die, a second slit channel is formed among the groove and the upper die, a first discharge port is formed among the first lip edge part, the opening and the second lip edge part, and the first lip edge part, a second discharge port is formed between the groove notch and the second lip edge part, the first feeding channel, the first slit channel and the first discharge port are sequentially communicated to form a first flow channel, and the second feeding channel, the second slit channel and the second discharge port are sequentially communicated to form a second flow channel isolated from the first flow channel. The slit coating head can realize simultaneous coating of at least two kinds of slurry, and coating efficiency and precision are improved.

Description

Slit coating head

Technical Field

The utility model relates to a coating technology field especially relates to a slit coating head who is particularly suitable for carrying out accurate coating on foil.

Background

The conventional slit coating head generally includes an upper die, a lower die, and a gasket disposed between the upper die and the lower die, wherein the gasket is disposed to form a slit passage having a discharge port at one side between the upper die and the lower die, and a slurry is extruded through the slit passage to the discharge port to perform a coating operation. For the occasions that two kinds of slurry need to be coated, for example, the coating slurry needed by the edge part is different from the coating slurry needed by the middle part, on one hand, mixing is easy to occur in the existing coating equipment, and on the other hand, because the pressure of two kinds of slurry media is often different, the gasket is easy to deform in practical application, so that the coating precision is seriously influenced, the service life of the gasket can be reduced, accurate coating at high speed is difficult to realize, and the overall coating quality is poor.

SUMMERY OF THE UTILITY MODEL

in order to overcome the not enough of above-mentioned prior art, the utility model provides a slit coating head can realize the coating of synchronous, not compounding of two kinds of thick liquids, improves the coating precision, and can conveniently adjust coated surface density simultaneously.

in order to solve the technical problem, the utility model discloses a technical scheme that the slit coating head adopted is:

A slit coating head comprises an upper die, a lower die and a gasket clamped between the upper die and the lower die, wherein the lower die is provided with a first lip edge part, the upper die is provided with a second lip edge part opposite to the first lip edge part, the lower die is provided with at least one first feeding channel, the upper die is provided with at least one second feeding channel, the gasket is provided with at least one opening and at least one groove, the upper die, the opening and the lower die form a first slit channel, the groove and the upper die form a second slit channel, the first lip edge part, the opening and the second lip edge part form a first discharge port, the first lip edge part, a groove opening of the groove and a second discharge port are formed between the second lip edge part, the first feeding channel, the first slit channel and the first discharge port are sequentially communicated to form a first flow channel, the second feeding channel, the second slit channel and the second discharge hole are communicated in sequence to form a second flow channel, and the first flow channel is isolated from the second flow channel.

Furthermore, the lower die is also provided with a medium distribution cavity at the top side opposite to the upper die, and the first feeding channel is communicated with the first slit channel through the medium distribution cavity.

furthermore, the cross-sectional width of the medium distribution cavity from the middle part to the two end parts is distributed from wide to narrow and from deep to shallow.

Further, the side edge of the medium distribution cavity far away from the first lip edge part is V-shaped, and the angle of the V-shaped is 175-185 degrees.

furthermore, a pressing strip for pressing the gasket on the upper die is further arranged in the medium distribution cavity, a gap is kept between the side wall of the pressing strip close to the first lip edge and the inner side wall of the medium distribution cavity close to the first lip edge, and the groove in the gasket is arranged in a manner of incomplete penetration at least at the overlapping position of the second flow channel and the first flow channel so as to separate the second flow channel from the first flow channel.

Furthermore, the pressing strip is locked on the upper die through a screw and enables the gasket to be attached to the bottom surface of the upper die by the locking force of the screw.

Furthermore, the pressing strip is a metal section, and a protection wall is arranged on the side surface of the metal section, which is attached to the lower die;

Or the pressing strip is a nonmetal section piece, and a thread sleeve is arranged on the nonmetal section piece.

Further, the slit coating head also comprises at least one adjusting component for adjusting the density of the coating surface.

Further, the adjusting assembly comprises an adjusting rod matched with the lower die, and the adjusting rod can be used for expanding or reducing a gap between the first lip edge part and the second lip edge part by applying acting force to the lower die wall body below the first lip edge part, so that the coating surface density is adjusted.

Furthermore, the adjusting rod comprises a top rod and a pull rod; the lower die is provided with a through groove which penetrates through the bottom of the lower die along the coating width direction, and the through groove comprises a first side wall positioned right below the first lip edge part and a second side wall opposite to the first side wall; the end part of the ejector rod can penetrate through the second side wall and then correspondingly apply thrust to the first side wall so as to reduce the gap; the pull rod penetrates through the first side wall and the second side wall, and applies pulling force to the first side wall to enlarge the gap. Based on the technical scheme, the utility model discloses a slit coating head has following beneficial effect for prior art:

The utility model discloses a slit coating head, through setting up at least one first feedstock channel at the lower mould, it sets up at least one second feedstock channel to go up the mould, the opening and the recess that set up on the cooperation gasket, corresponding formation first runner and the second runner of mutual isolation, the synchronization of two kinds of thick liquids at least of realization that can be convenient, the coating of not compounding, can not only improve coating efficiency, the coating degree of consistency that can also ensure whole coating surface is better, be favorable to improving whole coating precision, and practice thrift manufacturing cost by a wide margin.

Drawings

fig. 1 is an exploded schematic view of a slit coating head according to an embodiment of the present invention;

FIG. 2 is a front view of the slot coating head of FIG. 1;

FIG. 3 is a top view of the slot coating head of FIG. 1;

FIG. 4 is a schematic half-section view of the slot coating head of FIG. 2;

3 FIG. 3 5 3 is 3 a 3 cross 3- 3 sectional 3 view 3 of 3 a 3 slit 3 coating 3 head 3 A 3- 3 A 3 shown 3 in 3 FIG. 31 3; 3

FIG. 6 is a top view of an upper die in the slot coating head of FIG. 1;

FIG. 7 is a front view of a lower die in the slot coating head of FIG. 1;

FIG. 8 is a top view of the lower die of FIG. 7;

FIG. 9 is a sectional view of the lower die B-B shown in FIG. 8;

FIG. 10 is a top view of a shim in the slot coating head of FIG. 1;

FIG. 11 is a top view of a bead in the slot coating head of FIG. 1;

Fig. 12 is another schematic view of the bead structure in the slot coating head shown in fig. 1.

Description of reference numerals:

100-upper mould; 110-a second feed channel; 111-a feed port; 120-a second lip portion; 130-pin avoiding holes; 200-lower die; 210-a first feed channel; 211-opening a hole; 220-a first lip portion; 230-a media distribution chamber; 241-a first side wall; 242-a second sidewall; 300-a gasket; 310-a groove; 320-opening; 400-pressing a strip; 410-a threaded hole; 420-pin locating holes; 430-protective walls; 500-a hinge; 600-an adjustment assembly; 610-through slots; 620-adjusting rod; 700-a back plate; 800-mold closing screw.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

It should be noted that the terms of orientation such as up, down, top, bottom, side, etc. in the following embodiments are only relative concepts or are referred to the normal use state of the product, and should not be considered as limiting.

referring to fig. 1 to 7, an embodiment of the present invention provides a slit coating head, including an upper die 100, a lower die 200, and a gasket 300 clamped between the upper die 100 and the lower die 200, where the lower die 200 is provided with a first lip portion 220, the upper die 100 is provided with a second lip portion 120 opposite to the first lip portion 220, the lower die 200 is provided with at least one first feeding channel 210, the upper die 100 is provided with at least one second feeding channel 110, the gasket 300 is provided with at least one opening 320 and at least one groove 310, a first slit channel is formed between the upper die 100 (specifically, the bottom surface of the upper die 100), the opening 320 and the lower die 200, a second slit channel is formed between the groove 310 and the upper die 100, a first discharge hole is formed between the first lip portion 220, the opening 320 and the second lip portion 120, a second discharge hole is formed between the first lip portion 220, the notch of the groove 310 and the second lip portion 120, the first feeding channel 210, the second, The first slit channel and the first discharge port are communicated in sequence to form a first flow channel, the second feeding channel 110, the second slit channel and the second discharge port are communicated in sequence to form a second flow channel, and the first flow channel and the second flow channel are isolated from each other.

referring to fig. 2, 3 and 6, in practical use, in order to position and assemble the components of the slit coating head, the upper die 100, the spacer 300 and the lower die 200 are respectively provided with a plurality of positioning structures and fastening structures corresponding to each other. In the present embodiment, the upper mold 100 and the lower mold 200 are connected by a hinge 500; in order to improve the assembly accuracy and reliability of the upper die 100 and the lower die 200, a plurality of positioning holes and a back plate 700 are correspondingly arranged on the sides of the upper die 100 and the lower die 200, which are provided with hinges 500, respectively, the back plate 700 is fastened on the upper die 100 and the lower die 200 through screws, and a die assembly screw 800, a plurality of positioning holes, pins matched with the plurality of positioning holes and a pin avoiding hole 130 are arranged between the upper die 100 and the lower die 200 and penetrate from the top side of the upper die 100 to the bottom side of the lower die 200. A plurality of positioning structures and fastening structures are also provided between the spacer 300 and the upper mold 100 and the lower mold 200, and will not be described in detail.

It should be noted that the number of the first feeding channels 210 may be the same as the number of the openings 320, and each first feeding channel 210 is in one-to-one correspondence with each first slit channel formed by each opening 320; similarly, the number of the second feeding channels 110 may be the same as the number of the grooves 310, and each second feeding channel 110 is in one-to-one correspondence with each second slit channel formed by the grooves 310; referring to fig. 1 and 10; specifically, in this embodiment, the gasket 300 is provided with 3 openings and 6 grooves 310. When a plurality of first feed channels 210 are included, the first feed channels 210 are preferably isolated from each other, and when the first slit channels and the second slit channels are alternately arranged, the plurality of first slit channels should be isolated from each other, so that a plurality of isolated first flow channels can be formed; similarly, when a plurality of second feed channels 110 are included, the second feed channels 110 should be isolated from each other, and a plurality of isolated second flow channels can be formed. The number and the structural distribution of the feeding channels, the grooves 310 and the openings 320 on the gasket 300, the corresponding slit channels and the discharge ports can be designed according to actual needs, and are not limited herein.

In practical use, the second feeding channel 110 of the upper mold 100 and the first feeding channel 210 of the lower mold 200 are preferably used for feeding two different slurries, respectively, so that simultaneous coating of the different slurries through the second flow channel and the first flow channel is facilitated and mixing can be prevented.

Referring to fig. 1, 3 and 4, the second feed channel 110 may have a plurality of feed openings 111. The upper die 100 is provided with the plurality of feed inlets 111, so that the upper die can adapt to a plurality of different interfaces, and can perform grouting operation from a plurality of positions, thereby greatly improving the universality and the flexibility of use.

This head is scribbled to slit, through set up at least one first feedstock channel 210 at lower mould 200, it sets up at least one second feedstock channel 110 to go up mould 100, opening 320 and recess 310 that set up on the cooperation gasket 300, corresponding formation first runner and the second runner of mutual isolation, the synchronization of two kinds of thick liquids at least of realization that can be convenient, the coating of unmixing material, can not only improve coating efficiency, can also ensure that whole coating surface's coating degree of consistency is better, improve whole coating precision, practice thrift manufacturing cost by a wide margin, in addition still be favorable to the accurate control to coating surface density, and be convenient for the fluid pressure in the different runners of accurate control, thereby avoid gasket 300 to produce and warp.

In some embodiments, referring to fig. 10, the grooves 310 in the gasket 300 may be disposed on both sides of the opening 320. Thus, the second flow passages can be used for conveying the slurry required by edge coating, the first flow passages are used for middle coating, the slurry required by edge coating can be injected from the upper die 100, the slurry used by middle coating can be injected from the lower die 200, the slurry injection operation is more convenient, and a certain foolproof effect can be achieved.

Referring to fig. 1, 4, 5, 8 and 9, as a preferred embodiment of the present invention, especially on the premise that the lower die 200 is provided with only one first feeding channel 210, the lower die 200 is preferably further provided with a medium distribution chamber 230 at a top side opposite to the upper die 100, and the first feeding channel 210 is communicated with the first slit passage via the medium distribution chamber 230. By providing the medium distribution chamber 230, the slurry flowing out through the first flow channel can be more uniformly distributed to the desired coating width, and especially, the effect is better when the width of the first discharge hole corresponding to the opening 320 is wider.

Referring to fig. 1 and 8, as a preferred embodiment of the present invention, the cross-sectional width of the medium distribution cavity 230 from the middle to the two ends is from wide to narrow and from deep to shallow, such a structure can better avoid the slurry from generating a larger shear strength and from uneven and unstable conditions of along-the-way pressure/flow distribution in the process of flowing from the medium distribution cavity 230 to the first slit channel, prevent the slurry from easily forming a flow stagnation region at the two ends of the medium distribution cavity 230 and even settling in the cavity, and further ensure uniform discharge, thereby improving the coating quality.

It has been found through many experiments by the applicant that a more preferred configuration is one in which the edge of the media distribution chamber remote from the first lip 220 is V-shaped. When the V-shaped angle is 175-185 degrees, better coating surface density can be obtained; the V-shaped angle may be set to 180 °.

Referring to fig. 8, in practical applications, the opening 211 of the first feeding channel 210 communicating with the medium distribution chamber 230 is preferably located at the middle of the medium distribution chamber 230, which also has a good effect on improving the coating quality. Specifically, the opening 211 is shaped like a water droplet in a cross-sectional direction toward the discharge port. The structure can play a certain role in guiding flow and is beneficial to the outflow of slurry.

Referring to fig. 1, 4, 5, 11 and 12, a pressing bar 400 for pressing the gasket 300 against the upper mold 100 is further provided in the medium distribution chamber 230 as a preferred embodiment of the present invention. The arrangement of the pressing strip 400 can be used for supporting the gasket 300, so that the gasket 300 is prevented from being deformed due to different fluid pressures when the first feeding channel 210 of the upper die 100 and the second feeding channel 110 of the lower die 200 are filled with slurry, the service life of the gasket 300 is prolonged, and meanwhile, the situation that mixing materials are generated among different slit channels due to deformation of the gasket 300 can be well avoided. Considering that the lower mold 200 has a larger area of the medium distribution cavity 230 and the part of the gasket 300 above the medium distribution cavity 230 is in a suspended state, it is a preferable structure to provide the bead 400 in the medium distribution cavity 230, and the bead 400 can support and tightly press the gasket 300 against the upper mold 100, thereby well preventing the gasket 300 from deforming during use. And, the side wall of the pressing strip 400 close to the first lip portion 220 and the inner side wall of the media distribution cavity 230 close to the first lip portion 220 are spaced apart from each other, so that the slurry media in the media distribution cavity 230 can flow to the opening of the gasket 300 through the space between the pressing strip 400 and the inner side wall of the media distribution cavity 230, thereby further realizing discharge coating. To further avoid mixing between the first flow channel and the second flow channel, the groove 310 on the gasket 300 is disposed incompletely through at least the position where the second flow channel overlaps the first flow channel (specifically, the medium distribution cavity 230 in the first flow channel) to separate the second flow channel from the first flow channel, and it can also be understood that the groove 310 is disposed incompletely through at least the position corresponding to the above-mentioned spacing space, that is: the groove 310 has a bottom wall with a thickness at the spacer corresponding to the space of the interval so that the bottom wall and each side wall of the groove 310 provided by the spacer 300 itself can isolate the medium distribution chamber 230 of the lower die 200 from the second slit passage.

The whole of the groove 310 may not penetrate through the entire wall thickness of the gasket 300, so that the bottom wall and the side walls of the groove 310 provided by the gasket 300 can completely separate the lower mold 200 from the second slit passage, thereby well avoiding the mixing of the slurry in the first slit passage and the slurry in the second slit passage when the slurry is injected into the first feeding passage 210 and the second feeding passage 110. When the groove 310 is not completely penetrated, the depth of the groove may be set according to the viscosity of the slurry, which is not limited herein. Of course, in other embodiments, the recess 310 of the spacer 300 can also open through the spacer 300 at the location supported by the bead 400 and at the location supported by the top wall of the lower die 200 at the discharge edge, like the opening 320, since in these locations the bead 400 and the lower die 200, respectively, can act as a partition wall preventing pulp medium in the medium distribution chamber 230 from entering the recess 310. It should be understood that, especially when the slurry medium coated side of the first slit passage is large, the opening 320 of the gasket 300 is preferably opened through the entire wall thickness of the gasket 300, so as to simplify the manufacturing process, the first slit passage is formed by the bottom wall of the upper mold 100 and the top wall of the lower mold 200 together with the opening 320.

referring to fig. 1, 4, 5, 11 and 12, as a preferred embodiment of the present invention, the molding strip 400 is locked to the upper mold 100 by a screw (not shown) and the gasket 300 is attached to the bottom surface of the upper mold 100 by the locking force of the screw. The structure is convenient to assemble, damage to the pressing surface of the pressing strip 400 relative to the gasket 300 in the dismounting process can be avoided, the gasket 300 can be well pressed, and the gasket 300 can be kept flat and cannot deform in the using process.

Referring to fig. 11, in an alternative configuration, the molding 400 may be a relatively lightweight non-metallic section with a threaded sleeve (not shown) that may be used to receive the screw. Since it is inconvenient to directly form the screw hole 410 on the non-metal profile member, the convenience of manufacturing and assembling can be greatly improved by providing the screw sleeve, and the reliability of fastening between the bead 400 and the upper die 100 can be improved.

Referring to fig. 12, in an alternative configuration, the bead 400 may be a metal profile, such as a stainless steel profile, which may be made of an existing SUS630 material for better strength and rigidity. Since the media distribution chamber 230 generally has high precision, it is preferable that a protection wall 430 is provided on the side of the stainless steel profile fitting the lower mold 200 to prevent the bead 400 from damaging the media distribution chamber 230 when contacting the lower mold 200, especially the chamber wall of the media distribution chamber 230. The protection wall 430 may be a plastic layer, a rubber layer or a silica gel layer embedded in the side wall of the metal section. In this embodiment, the threaded holes 410 may be provided directly in the metal profile piece to facilitate the locking of the screws.

Referring to fig. 11 and 12, in some embodiments, a pin positioning hole 420 may be further disposed on the molding strip 400, and the pin positioning hole 420 is used to position a pin of the molding strip 400, so as to achieve secondary positioning of the gasket 300 by using the molding strip 400, further improve the assembly precision of the gasket 300, and accordingly improve the coating precision.

Referring to fig. 1, in the present embodiment, the pressing strip 400 may include a left pressing strip and a right pressing strip spaced apart from each other along the coating width direction, so that, in the case where the coating width is wide and at least two large openings 320 are spaced apart from each other, the gasket 300 may be better pressed against the upper mold 100, and at the same time, the reliability of the overall structure may be better ensured.

Referring to fig. 5 and 9, as a preferred embodiment of the present invention, the slit coating head further includes at least one adjusting unit 600 for adjusting the density of the coated surface. The use flexibility of the slit coating head can be greatly improved by arranging the adjusting component 600 to adjust the density of the coating surface.

As an optimized embodiment of the utility model, above-mentioned adjusting part 600 can be through the regulation and control go up the slit size of discharge gate department between mould 100 and the lower mould 200 to the regulation of coating face density is realized, and such structure is simpler, convenient operation, and is favorable to realizing accurate regulation and control.

Referring to fig. 5 and 9, as a preferred embodiment of the present invention, the adjusting assembly 600 may include an adjusting lever 620 engaged with the lower mold 200, and the adjusting lever 620 may adjust the coating surface density by applying a force to the wall of the lower mold 200 under the first lip portion 220 to correspondingly enlarge or reduce the gap between the first lip portion 220 and the second lip portion 120. Specifically, in the present embodiment, the lower mold 200 may be provided with a through slot 610 penetrating through the bottom of the lower mold 200 along the coating width direction, the through slot 610 includes a first side wall 241 directly below the first lip portion 220 and a second side wall 242 opposite to the first side wall 241, the adjusting rod 620 may be disposed on the second side wall 242 and extend into the through slot 610, and the gap between the first lip portion 220 and the second lip portion 120 may be enlarged or reduced by applying a force to the first side wall 241. In practical applications, the adjusting rod 620 may include a top rod and a pull rod; wherein, the end of the top rod can penetrate through the second side wall 242 and then correspondingly apply thrust to the first side wall 241 to reduce the gap; the pull rod is inserted through the first and second sidewalls 241 and 242, and is used to open the gap by applying a pulling force to the first sidewall 241. Promote first lateral wall 241 or through the first lateral wall 241 of pull rod pulling through the ejector pin, make first lateral wall 241 produce and warp to corresponding first lip portion 220 of driving corresponds produces upwards or decurrent deformation, and then makes the gap between first lip portion 220 and the second lip portion 120 expand or reduce, in order to realize the regulation to coating face density, such structure not only makes it more convenient to adjust coating face density, still is favorable to realizing accurate regulation and control. More preferably, the adjusting assembly 600 includes a plurality of adjusting rods 620, and the plurality of adjusting rods 620 are spaced along the extending direction of the first lip portion 220 (i.e., the coating width direction); for example, the adjusting components 600 can be respectively arranged at the positions corresponding to the edge coating area and the middle coating area, so that on one hand, the height of the discharge port can be adjusted according to the actual coating requirement, thereby realizing the corresponding coating thickness and improving the use flexibility; on the other hand, the height of the discharge port can be adjusted through the adjusting assembly 600, so that the discharge port has inconsistent height in the whole coating width direction, the condition that slurry is accumulated at two ends of the discharge port in the coating width direction is prevented, and uniform coating thickness in the coating width direction is ensured; in addition, the deformation degree of the whole first lip portion 220 can be better controlled, and the height of the discharge port corresponding to the edge coating area and the height of the discharge port corresponding to the middle coating area can be respectively adjusted, so that the middle coating amount and the edge coating amount can be accurately regulated. In the present embodiment, the adjusting rod 620 is preferably an adjusting screw.

the thickness of the first sidewall 241 may be set according to an actually required adjustment range and a material of the lower mold 200.

In particular in this embodiment, a dosing pump (not shown) is also preferably provided on each feed channel to ensure uniformity of coating width and thickness.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The slit coating head is characterized by comprising an upper die, a lower die and a gasket clamped between the upper die and the lower die, wherein the lower die is provided with a first lip edge part, the upper die is provided with a second lip edge part opposite to the first lip edge part, the lower die is provided with at least one first feeding channel, the upper die is provided with at least one second feeding channel, the gasket is provided with at least one opening and at least one groove, a first slit channel is formed between the upper die and the opening and the lower die, a second slit channel is formed between the groove and the upper die, a first discharge port is formed between the first lip edge part and the opening and the second lip edge part, a second discharge port is formed between the first lip edge part and the groove opening of the groove and the second lip edge part, and the first feeding channel and the first discharge port are sequentially communicated to form a first flow channel, the second feeding channel, the second slit channel and the second discharge hole are communicated in sequence to form a second flow channel, and the first flow channel is isolated from the second flow channel.

2. The slot coating head of claim 1 wherein the lower die is further provided with a media distribution cavity at a top side opposite the upper die, the first feed channel communicating with the first slot channel via the media distribution cavity.

3. A slot coating head according to claim 2, wherein the cross-sectional widths of the media distribution cavities from the middle to the two ends are distributed from wide to narrow and from deep to shallow.

4. A slot coating head according to claim 2, wherein a side edge of the medium distribution chamber away from the first lip portion is V-shaped, and the V-shaped angle is 175-185 °.

5. The slot coating head of claim 2 wherein the media distribution chamber further comprises a bead disposed therein for pressing the gasket against the upper mold, the bead being spaced apart from a sidewall of the media distribution chamber adjacent the first lip, the groove of the gasket being disposed incompletely through at least a portion of the second flow channel overlapping the first flow channel to separate the second flow channel from the first flow channel.

6. The slot coating head of claim 5 wherein the bead is locked to the upper die by a screw and the shim is pressed against the bottom surface of the upper die by the locking force of the screw.

7. The slit coating head according to claim 5 wherein the bead is a metal profile provided with a protective wall on a side where the metal profile is attached to the lower die;

8. A slot coating head according to any one of claims 1 to 7, further comprising at least one adjusting component for adjusting the density of the coated surface.

9. The slot coating head of claim 8 wherein the adjustment assembly includes an adjustment bar that cooperates with the lower die, the adjustment bar being operable to adjust the areal density of coating by applying a force to the wall of the lower die below the first lip to expand or contract the gap between the first lip and the second lip.

10. The slot coating head of claim 9 wherein the adjustment rod comprises a top bar and a pull bar; the lower die is provided with a through groove which penetrates through the bottom of the lower die along the coating width direction, and the through groove comprises a first side wall positioned right below the first lip edge part and a second side wall opposite to the first side wall; the end part of the ejector rod can penetrate through the second side wall and then correspondingly apply thrust to the first side wall so as to reduce the gap; the pull rod penetrates through the first side wall and the second side wall, and applies pulling force to the first side wall to enlarge the gap.