CN116809328A - Coating die head for improving distribution uniformity of coating slurry - Google Patents
Coating die head for improving distribution uniformity of coating slurry Download PDFInfo
- Publication number
- CN116809328A CN116809328A CN202310883712.1A CN202310883712A CN116809328A CN 116809328 A CN116809328 A CN 116809328A CN 202310883712 A CN202310883712 A CN 202310883712A CN 116809328 A CN116809328 A CN 116809328A
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- Prior art keywords
- coating
- die
- lower die
- screw
- pressure regulating
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- 238000009826 distribution Methods 0.000 title claims abstract description 50
- 238000000576 coating method Methods 0.000 title claims abstract description 40
- 239000011248 coating agent Substances 0.000 title claims abstract description 39
- 239000006255 coating slurry Substances 0.000 title claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract description 51
- 230000001105 regulatory effect Effects 0.000 claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 8
- 230000006837 decompression Effects 0.000 claims description 3
- 239000011295 pitch Substances 0.000 description 6
- 238000009966 trimming Methods 0.000 description 3
- 238000007765 extrusion coating Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0254—Coating heads with slot-shaped outlet
- B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve
Landscapes
- Coating Apparatus (AREA)
Abstract
The invention provides a coating die head for improving coating slurry distribution uniformity, which comprises an upper die and a lower die, wherein a gasket is arranged between the upper die and the lower die, a feeding hole is formed in the rear side surface of the lower die, the top surface of the middle part of the lower die is recessed downwards along the width direction to form a slurry distribution cavity, the bottom of the slurry distribution cavity is communicated with the feeding hole through a feeding channel, the bottom surface of the upper die at the slurry distribution cavity is connected with a pressure regulating block, the width of the pressure regulating block along the width direction is smaller than the width of the slurry distribution cavity, a gentle curved surface channel is formed between the pressure regulating block and the side wall of the slurry distribution cavity, an inwards recessed mixing groove is formed in the front side surface of the pressure regulating block along the width direction, and an extrusion channel is formed between the upper die and the lower die at the front side of the pressure regulating block. The invention improves the uniformity of coating slurry distribution, prevents slurry from settling and solidifying, improves the coating uniformity and improves the production efficiency.
Description
Technical Field
The present invention relates to a coating die, and more particularly, to a coating die that improves uniformity of distribution of coating paste.
Background
With the rapid development of the coating industry, the application of slot extrusion coating is increasingly widespread. Slit extrusion coating is a precise wet coating technique, and its working principle is that slurry is extruded and ejected along the slit of a coating die under a certain pressure and a certain flow rate to be transferred onto a substrate. Compared with other coating modes, the coating method has many advantages such as high coating speed, high precision and uniform wet thickness.
The existing coating die head consists of an upper die, a lower die and a gasket clamped in the upper die, wherein a slurry mixed flow cavity, a slurry distribution cavity and a feed inlet communicated with the slurry distribution cavity are arranged on the lower die. The slurry enters the cavity from the feed inlet and is extruded and coated on the substrate through the mixed flow cavity. The mixed flow cavity is used for relieving pressure impact of the die head and secondarily distributing the slurry, so that the slurry is distributed more uniformly. Because the thickness of the coating is not uniform due to the influence of factors such as slurry temperature, viscosity and the like, and the thickness of the coating needs to be adjusted, an adjusting mechanism is usually arranged on an upper die head to change the flow of a coating slit. The adjusting mechanism consists of a plurality of adjusting blocks, a differential head and the like, when the flow is not required to be adjusted, the adjusting blocks are accommodated in the accommodating groove of the upper die head, and when the flow is adjusted, the adjusting blocks are lowered from the accommodating groove to the coating slit by rotating the differential head.
However, due to the difference between the cavity structure of the die head and the use of coating slurry, the slurry can be settled and solidified after the existing die head is coated for a certain time, and phenomena such as scratches, uneven coating and the like can occur in the coating, and the current solution mode is to stop the machine to clean and repair the die head, so that the production efficiency is seriously affected.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a coating die head for improving the uniformity of coating paste distribution, which can improve the uniformity of coating paste distribution, prevent paste from settling and solidifying, improve coating uniformity, and improve production efficiency.
The technical scheme of the invention is that the coating die head for improving the coating slurry distribution uniformity comprises an upper die and a lower die, wherein a gasket is arranged between the upper die and the lower die, a feeding hole is formed in the rear side surface of the lower die, the top surface of the middle part of the lower die is recessed downwards along the width direction to form a slurry distribution cavity, the bottom of the slurry distribution cavity is communicated with the feeding hole through a feeding channel, the bottom surface of the upper die at the slurry distribution cavity is connected with a pressure regulating block, the width of the pressure regulating block along the width direction is smaller than the width of the slurry distribution cavity, a gentle curved surface channel is formed between the pressure regulating block and the side wall of the slurry distribution cavity, an inwards recessed mixing groove is formed in the front side surface of the pressure regulating block along the width direction, and an extrusion channel is formed between the upper die and the lower die at the front side of the pressure regulating block; raw materials reach the slurry distribution cavity from the feed inlet through the feed channel and diffuse to two sides along the width direction to form raw material fluid with fixed width, and the raw material fluid flows forwards through the curved surface channel to enter the mixed flow groove for decompression and then is extruded and coated from the extrusion channel.
Preferably, the caliber of the curved surface channel avoiding the position of the mixed flow groove is in an integrally reduced structure from back to front, and the caliber of the curved surface channel is larger than that of the curved surface channels at other positions when the curved surface channel is at the position of the mixed flow groove.
Preferably, the cross section of the flow mixing groove is arc-shaped, the caliber of the corresponding curved surface channel is maximum when the middle part of the flow mixing groove is positioned, and the caliber of the corresponding curved surface channel is gradually reduced when the flow mixing groove is positioned from the middle part to the front side and the back side.
Preferably, the left end and the right end of the upper die are provided with reflow holes, the inner side ends of the left reflow hole and the right reflow hole are respectively communicated with the left end and the right end of the slurry distribution cavity, and the outer side ends of the reflow holes are plugged through a valve switch during production.
Preferably, the front part of the lower die is provided with a fine adjustment groove, the lower die positioned at the front side of the fine adjustment groove forms a lower die lip, the lower end of the lower die is provided with a series of mounting holes along the width direction, each mounting hole comprises a threaded hole positioned at the rear part of the lower die and a through hole positioned at the front part of the lower die, a differential bolt group is connected in each mounting hole and comprises a screw positioned at the rear side and a screw positioned at the front side, an external thread and a threaded hole on the outer side of the screw are meshed, an internal threaded hole of the screw is meshed with an external thread at the rear part of the screw, the front part of the screw passes through the through hole and the fine adjustment groove and is locked in the lower die lip through the screw, the screw pitches of the external thread and the internal thread are identical, the screw pitches of the external thread are larger than those of the internal thread, and the distance that the screw rotates for one circle of forward or backward movement is the screw pitch difference of the external thread and the internal thread.
Preferably, the upper die is provided with a series of mounting holes, and the upper die and the lower die are fixedly connected at the mounting holes by bolts.
Preferably, the fixing structure of the pressure regulating block is formed by connecting and fixing a plurality of screws which are arranged along the width direction in threaded holes which penetrate through the upper die and the gasket downwards and are connected to the top of the pressure regulating block.
The differential bolt fine adjustment assembly can simultaneously carry out a pushing and pulling micro adjustment on the lower die lip, and by arranging the pressure adjustment block, the fluidity of the slurry in the slurry distribution cavity is improved, the influence on the coating quality caused by solidification after the slurry is deposited is avoided, the slurry is directly distributed for the second time by the mixed flow cavity, the pressure impact of the die head is relieved, the slurry is more uniformly distributed, the die head is prevented from being cleaned by the arrangement of the backflow holes, the time is saved, and the production efficiency is improved.
Drawings
FIG. 1 is a rear view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view of the internal structure of the present invention;
wherein: 1-upper die; 2-lower die; 21-a fine adjustment groove; 22-lower die lip; 23-a threaded hole; 24-through holes; 25-differential bolt group; 251-a screw; 252-screw; 26-a screw; 3-a gasket; 4-a feed inlet; 5-a slurry distribution chamber; 6-a feed channel; 7, pressure regulating blocks; 71-a mixing groove; 8-a curved surface channel; 9-extrusion channels; 10-a reflow hole; 11-valve switch; 12-mounting holes.
Description of the embodiments
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 4, the invention provides a coating die head for improving the uniformity of coating slurry distribution, which comprises an upper die 1 and a lower die 2, wherein a gasket 3 is arranged between the upper die 1 and the lower die 2, a feed inlet 4 is arranged on the rear side surface of the lower die 2, the top surface of the middle part of the lower die 2 is recessed downwards along the width direction to form a slurry distribution cavity 5, the bottom of the slurry distribution cavity 5 is communicated with the feed inlet 4 through a feed channel 6, the bottom surface of the upper die 1 at the slurry distribution cavity 5 is connected with a pressure regulating block 7, the width of the pressure regulating block 7 along the width direction is smaller than the width of the slurry distribution cavity 5, a gentle curved surface channel 8 is formed between the pressure regulating block 7 and the side wall of the slurry distribution cavity 5, a mixing groove 71 recessed inwards is arranged on the front side surface of the pressure regulating block 7 along the width direction, and an extrusion channel 9 is arranged between the upper die 1 and the lower die 2 at the front side of the pressure regulating block 7; raw materials reach the slurry distribution cavity 5 from the feed inlet 4 through the feed channel 6 and spread to two sides along the width direction to form raw material fluid with fixed width, and the raw material fluid flows forwards through the curved surface channel 8 to enter the mixing groove 71 for decompression and then is extruded and coated from the extrusion channel 9.
On the basis of the scheme, the caliber of the curved surface channel 8 avoiding the position of the mixing groove 71 is integrally reduced from back to front, and the caliber of the curved surface channel 8 is larger than that of the curved surface channels 8 at other positions when the curved surface channel 8 is positioned at the position of the mixing groove 71.
Specifically, the cross-sectional shape of the flow mixing groove 71 is circular arc, the caliber of the corresponding curved surface channel 8 is maximum when the middle part of the flow mixing groove 71 is positioned, and the caliber of the corresponding curved surface channel 8 is gradually reduced when the flow mixing groove 71 is from the middle part to the front and back sides.
The left end and the right end of the upper die 1 are provided with reflow holes 10, the inner side ends of the left reflow hole and the right reflow hole 10 are respectively communicated with the left end and the right end of the slurry distribution cavity 5, and the outer side ends of the reflow holes 10 are blocked by a valve switch 11 during normal production. When the production is prepared, the valve switch 11 is opened, the slurry raw material generates bubbles when passing through the feeding channel 6, the slurry distribution cavity 5 and the curved surface channel 8, the bubbles are mixed in the raw material and discharged through the backflow hole 10, the part of slurry mixed with the bubbles is refluxed for one time before the formal production, the slurry with the bubbles is recycled into the slurry tank for use after defoaming treatment, the discharged slurry can be recycled, so that redundant bubbles in the cavity can be discharged, and when the bubbles are emptied, the valve switch 11 is closed, the formal production is started, so that the raw material is not mixed with the bubbles.
Specifically, the front part of the lower die 2 is provided with a trimming groove 21, the lower die 2 positioned at the front side of the trimming groove 21 forms a lower die lip 22, the lower end of the lower die 2 is provided with a series of mounting holes along the width direction, each mounting hole comprises a threaded hole 23 coaxially arranged at the rear part of the lower die 2 and a through hole 24 positioned at the front part of the lower die 2, a differential bolt group 25 is connected in each mounting hole, each differential bolt group 25 comprises a screw 251 positioned at the rear side and a screw 252 positioned at the front side, external threads on the outer side of the screw 251 are meshed with the threaded holes 23, the internal threaded holes of the screws 251 are meshed with the external threads at the rear part of the screw 252, the front part of the screw 252 is locked in the lower die lip 22 through the screws 26 after passing through the through holes 24 and the trimming groove 21, the external threads and the internal threads of the screws 251 are screwed to be identical, the pitch of the external threads is larger than that of the internal threads, and the distance of forward or backward movement of the screw 251 is equal to the difference between the external threads and the internal threads of the screw 251. The specific calculation mode is as follows: the pitch of the external thread of the screw 251 is a, the pitch of the internal thread is b, the screw 251 moves forward by a distance a relative to the lower die 2 after one turn, and the screw 252 moves backward by a distance b relative to the screw 251, and the screw 252 moves forward by a-b relative to the lower die 2 due to a > b. The same applies to the reverse rotation of the screw 151.
In addition, the upper die 1 is provided with a series of mounting holes 12, and the upper die 1 and the lower die 2 are fixedly connected at the mounting holes 12 by bolts.
Further, the fixing structure of the pressure regulating block 7 is that a plurality of screws arranged along the width direction penetrate through the upper die 1 and the gasket 3 downwards and then are connected and fixed in a threaded hole at the top of the pressure regulating block 7.
In the invention, raw materials enter from a feed port 4, flow into a slurry distribution cavity 5 through a feed channel 6 and spread to the left and right sides to form raw material fluid with the same width as the slurry distribution cavity 5, the raw material fluid uniformly flows forwards through a curved surface channel 8 between the lower surface of a pressure regulating block 7 and the side wall of the slurry distribution cavity 5, flows into a mixing groove 71 after being depressurized, flows out from the curved surface channel 8 at the front side into an extrusion channel 9 between an upper die and a lower die, finally, coating slurry with the same thickness is extruded, and the thickness of the coating slurry is generally 40-250 mu m. The gap between the extrusion channel 9 and the die lip 22 can be adjusted by the differential bolt set 25 at the lower die 2, and the screw 252 moves forward or backward when the screw 251 is screwed, so that the gap between the die lip and the die lip is correspondingly changed.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, but any simple modification, equivalent variation or modification made to the above embodiments according to the technical principles of the present invention still falls within the scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides an improve coating die head of coating slurry distribution homogeneity, includes upper mould (1) and lower mould (2), be provided with gasket (3), its characterized in that between upper mould (1) and lower mould (2): the back side of the lower die (2) is provided with a feed inlet (4), the top surface of the middle part of the lower die (2) is recessed downwards along the width direction to form a slurry distribution cavity (5), the bottom of the slurry distribution cavity (5) is communicated with the feed inlet (4) through a feed channel (6), the bottom surface of the upper die (1) at the position of the slurry distribution cavity (5) is connected with a pressure regulating block (7), the width of the pressure regulating block (7) along the width direction is smaller than the width of the slurry distribution cavity (5), a gentle curved surface channel (8) is formed between the pressure regulating block (7) and the side wall of the slurry distribution cavity (5), the front side of the pressure regulating block (7) is provided with an inwards recessed mixing groove (71) along the width direction, and an extrusion channel (9) is arranged between the upper die (1) and the lower die (2) at the front side of the pressure regulating block (7). Raw materials reach the slurry distribution cavity (5) from the feed inlet (4) through the feed channel (6) and spread to two sides along the width direction to form raw material fluid with fixed width, and the raw material fluid flows forwards through the curved surface channel (8) to enter the mixing groove (71) for decompression and then is extruded and coated from the extrusion channel (9).
2. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the caliber of the curved surface channel (8) avoiding the position of the mixing groove (71) is of an integrally reduced structure from back to front, and the caliber of the curved surface channel (8) is larger than that of the curved surface channels (8) at other positions when the curved surface channel (8) is positioned at the mixing groove (71).
3. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the cross section of the mixed flow groove (71) is arc-shaped, the caliber of the corresponding curved surface channel (8) is maximum when the middle part of the mixed flow groove (71) is positioned, and the caliber of the corresponding curved surface channel (8) is gradually reduced when the mixed flow groove (71) moves from the middle part to the front side and the back side.
4. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the left end and the right end of the upper die (1) are provided with reflow holes (10), the inner side ends of the left reflow hole and the right reflow hole (10) are respectively communicated with the left end and the right end of the slurry distribution cavity (5), and the outer side ends of the reflow holes (10) are blocked by a valve switch (11) during production.
5. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the front part of the lower die (2) is provided with a fine adjustment groove (21), the lower die (2) positioned at the front side of the fine adjustment groove (21) forms a lower die lip (22), the lower end of the lower die (2) is provided with a series of mounting holes along the width direction, each mounting hole comprises a threaded hole (23) positioned at the rear part of the lower die (2) and a through hole (24) positioned at the front part of the lower die (2) which are coaxially arranged, a differential bolt group (25) is connected in each mounting hole, each differential bolt group (25) comprises a screw (251) positioned at the rear side and a screw rod (252) positioned at the front side, the external threads of the screw (251) are meshed with the external threads of the screw rod (23), the internal threaded holes of the screw (251) are meshed with the external threads of the rear part of the screw rod (252), the front part of the screw rod (252) passes through the through holes (24) and the fine adjustment groove (21) and is locked in the lower die lip (22) through the screw (26), the external threads of the screw rod (251) and the internal threads are screwed to the same and the external threads of the screw rod (251), the external threads of the screw rod (251) are larger than the internal threads, and the external threads of the screw rod (251) are screwed to the external threads of the screw rod (251), and the external threads of the screw rod (251) are screwed to the screw threads of the screw rod (252) and the screw threads to the screw rod (252) to the screw threads and the screw).
6. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the upper die (1) is provided with a series of mounting holes (12), and the upper die (1) and the lower die (2) are fixedly connected at the mounting holes (12) by bolts.
7. A coating die for improving uniformity of coating paste distribution according to claim 1, wherein: the fixing structure of the pressure regulating block (7) is that a plurality of screws which are arranged along the width direction downwards penetrate through the upper die (1) and the gasket (3) and then are connected and fixed in threaded holes at the top of the pressure regulating block (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310883712.1A CN116809328A (en) | 2023-07-18 | 2023-07-18 | Coating die head for improving distribution uniformity of coating slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310883712.1A CN116809328A (en) | 2023-07-18 | 2023-07-18 | Coating die head for improving distribution uniformity of coating slurry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116809328A true CN116809328A (en) | 2023-09-29 |
Family
ID=88112723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310883712.1A Pending CN116809328A (en) | 2023-07-18 | 2023-07-18 | Coating die head for improving distribution uniformity of coating slurry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116809328A (en) |
-
2023
- 2023-07-18 CN CN202310883712.1A patent/CN116809328A/en active Pending
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