CN108568380B - Bend type extrusion coating head - Google Patents
Bend type extrusion coating head Download PDFInfo
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- CN108568380B CN108568380B CN201810526769.5A CN201810526769A CN108568380B CN 108568380 B CN108568380 B CN 108568380B CN 201810526769 A CN201810526769 A CN 201810526769A CN 108568380 B CN108568380 B CN 108568380B
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- slit
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- lip
- straight
- coating head
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- 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
- B05C5/005—Curtain coaters
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Abstract
A bent type extrusion coating head comprises a first coating lip and a second coating lip, wherein a gasket is arranged between the first coating lip and the second coating lip, the first coating lip and the second coating lip are separated by the gasket to form a coating slit, the coating slit is divided into two sections which are sequentially connected, the first section of the coating slit is a straight slit, and the lower end of the straight slit is a discharge hole; the second section coating slit is an arc slit, and a trough communicated with the slit is arranged on the arc slit. The invention has the advantages of preventing tailing during coating and being suitable for vertically or obliquely downward coating.
Description
Technical Field
The invention relates to an improvement of an extrusion coating head, in particular to a curve type extrusion coating head.
Background
As shown in fig. 1, the conventional extrusion coating head includes a first coating lip 100 and a second coating lip 200, a spacer is disposed between the first coating lip 100 and the second coating lip 200, the spacer separates the first coating lip 100 and the second coating lip 200 to form a coating slit 300, a material groove 310 is disposed on one of the first coating lip 100 and the second coating lip 200, and the material groove 310 is communicated with the coating slit 300. The extrusion coating head is satisfactory in coating effect when it is arranged horizontally or obliquely upward. However, when such an extrusion coating head is arranged vertically downward or obliquely downward, a tailing phenomenon occurs, that is, a tailing phenomenon in which the slurry is not immediately stopped when the coating is stopped in the middle of batch coating, which is not allowed in the batch coating process of the lithium battery electrode, occurs in a small amount.
When the extrusion coating head is arranged vertically downwards or obliquely downwards, the trailing phenomenon is mainly caused by the following points: the resistance to the slurry on the opposing surfaces of the first coating lip 100 and the second coating lip 200, and the pressure of the slurry remaining in the trough 300 against the slurry in the slit 400 when the coating is stopped. When the coating is stopped, if the pressure of the slurry against the slurry in the slit 400 is equal to or less than the resistance of the opposite surfaces of the first coating lip 100 and the second coating lip 200 against the slurry, the tailing phenomenon does not occur at the discharge port 500, and otherwise, the tailing phenomenon occurs. Further analysis suggests that the resistance to the slurry of the opposing faces of the first and second lips 100 and 200 is determined by two factors, the first being the smoothness of the opposing faces of the first and second lips 100 and 200, and of course, if greater resistance is to be achieved, it is desirable that the rougher the opposing faces of the first and second lips 100 and 200 be the better, the second being the viscosity of the slurry. In the actual manufacturing process of the extrusion coating head, the more uniform the coating, the better in consideration of other coating effects at the time of coating, such as the uniformity of coating; in the coating process, the coated slurry layer is not required to generate spots caused by bubbles, and the opposite surfaces of the first coating lip 100 and the second coating lip 200 are required to be made to have higher finish and better finish; the viscosity of the slurry, which is constant for each slurry, cannot be changed at will.
Therefore, the pressure of the remaining slurry against the slurry in the slit has a large influence on the tailing phenomenon at the time of coating.
Disclosure of Invention
In view of the above-identified deficiencies in the art or needs for improvements, the present invention provides a curved extrusion coating head that prevents tailing during coating and is suitable for vertically downward or obliquely downward coating.
The technical scheme of the invention is as follows: the bend type extrusion coating head comprises a first coating lip and a second coating lip, wherein a gasket is arranged between the first coating lip and the second coating lip, the first coating lip and the second coating lip are separated by the gasket to form a coating slit, the coating slit is divided into two sections which are sequentially connected, the first section of the coating slit is a straight slit, and the lower end of the straight slit is a discharge hole; the second section coating slit is an arc slit, and a trough communicated with the slit is arranged on the arc slit.
As an improvement of the invention, the trough is arranged at the high point of the cambered surface slit.
As an improvement of the invention, an extending slit which is tilted upwards is arranged on one side of the cambered slit, which is far away from the straight slit.
As an improvement to the present invention, the extension slit is a straight slit.
As an improvement to the present invention, the extension slit is a curved slit.
As a refinement of the present invention, the angle α between the straight slits and the horizontal plane is selected between 30 degrees and 90 degrees.
As an improvement of the present invention, a contact portion is provided on the coating lip on the side away from the 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 invention adopts the coating slit of the coating head to be divided into two sections which are connected in sequence, the first section of the coating slit is a straight slit, and the lower end of the straight slit is a discharge hole; the second section coating slit is an arc slit, and a trough communicated with the slit is arranged on the arc slit, so that the invention has the advantages of preventing trailing during coating and being suitable for vertically downward or obliquely downward coating.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a prior art extrusion coating head;
FIG. 2 is a schematic view of the structure of a first embodiment of a die coating head of the present invention;
FIG. 3 is a schematic view of the structure of a second embodiment of the extrusion coating head of the present invention;
FIG. 4 is a schematic view of the structure of a third embodiment of a die coating head of the present invention;
fig. 5 is a schematic structural view of a fourth embodiment of the extrusion coating head of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 shows a first embodiment of a bending extrusion coating head according to the present invention, which includes a first coating lip 1 and a second coating lip 2, a gasket is disposed between the first coating lip 1 and the second coating lip 2, the gasket separates the first coating lip 1 and the second coating lip 2 to form a coating slit 3, the coating slit 3 is divided into two sections connected in sequence, the first section coating slit 31 is a straight slit, and a discharge port 311 is disposed at a lower end of the straight slit; the second cutting coating slit 32 is an arc slit, and a trough 33 communicated with the slit is arranged on the arc slit; the volume of the trough 33 is sized so that when the applicator is suspended, the slurry is temporarily stored in the trough 33 and does not flow down the application slot, and does not substantially pressurize the slurry in the application slot. In this embodiment, the trough 33 is disposed at the high point of the arc slit.
The invention adopts the coating slit of the coating head to be divided into two sections which are connected in sequence, the first section coating slit 31 is a straight slit, and the lower end of the straight slit is a discharge hole 311; the second coating slit 32 is a curved slit, and a trough 33 communicated with the slit is arranged on the curved slit, so that the invention has the advantages of preventing trailing during coating and being suitable for vertically or obliquely downward coating.
Preferably, an upwardly raised extension slit 34 is provided on the side of the curved slit away from the straight slit, and serves to discharge bubbles in the slurry. In this embodiment, the extension slit 34 may be a straight slit (not shown); or a curved slit (as shown in this figure).
Referring to fig. 3, fig. 3 shows a second embodiment of the curved extrusion coating head of the present invention, which includes a first coating lip 1 and a second coating lip 2, a gasket is disposed between the first coating lip 1 and the second coating lip 2, the gasket separates the first coating lip 1 and the second coating lip 2 to form a coating slit 3, the coating slit 3 is divided into two sections connected in sequence, the first section coating slit 31 is a straight slit, a lower end of the straight slit is a discharge port 311, the second section coating slit 32 is a curved slit, a trough 33 is disposed on the curved slit and is communicated with the slit, a volume of the trough 33 is sized to temporarily store slurry in the trough 33 when the coating machine stops coating, and not flow down along the coating slit, and not substantially generate pressure on the slurry in the coating slit, in this embodiment, the trough 33 is disposed at a high point of the curved slit, in this embodiment, an included angle α between the straight slit and a horizontal plane 4 can be selected between 30 degrees, and when the straight slit is disposed in an inclined space, and the extrusion head is particularly advantageous to be disposed in the inclined space.
The invention adopts the coating slit of the coating head to be divided into two sections which are connected in sequence, the first section coating slit 31 is a straight slit, and the lower end of the straight slit is a discharge hole 311; the second coating slit 32 is a curved slit, and a trough 33 communicated with the slit is arranged on the curved slit, so that the invention has the advantages of preventing trailing during coating and being suitable for vertically or obliquely downward coating.
Referring to fig. 4, fig. 4 shows a third embodiment of the bend type extrusion coating head of the present invention, which includes a first coating lip 1 and a second coating lip 2, a gasket is disposed between the first coating lip 1 and the second coating lip 2, the gasket separates the first coating lip 1 and the second coating lip 2 to form a coating slit 3, the coating slit 3 is divided into two sections which are connected in sequence, the first section coating slit 31 is a straight slit, and the lower end of the straight slit is a discharge port 311; the second cutting coating slit 32 is an arc slit, and a trough 33 communicated with the slit is arranged on the arc slit; the volume of the trough 33 is sized so that when the applicator is suspended, the slurry is temporarily stored in the trough 33 and does not flow down the application slot, and does not substantially pressurize the slurry in the application slot. In this embodiment, the trough 33 is disposed at the high point of the arc slit. In this embodiment, the contact portion 11 is disposed on the coating lip on the side away from the discharge port 4, and the bottom 111 of the contact portion 11 is a cambered surface structure, so that when the present embodiment is coated on a substrate vertically downward or obliquely downward, the bottom 111 of the contact portion 11 abuts against the front part of the advancing direction of the substrate, so as to stabilize the substrate against shaking by the backing roller, and meanwhile, the slurry outlet 311 of the coating head is suspended above the substrate, and the slurry flows out in a free state (i.e. without any influence of the extension of the conventional contact coating lip) when the slurry flows out 311 for coating, as with a non-contact coating effect, the purpose of achieving the non-contact coating effect by using a contact coating method is achieved (in the prior art, the non-contact coating effect is better than the contact coating effect).
Referring to fig. 5, fig. 5 shows a fourth embodiment of a curved extrusion coating head according to the present invention, wherein the embodiment shown in fig. 5 has the same general structure as the embodiment shown in fig. 4, except that the bottom surface 111 of the contact portion 11 is a flat surface.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A bend type extrusion coating head comprises a first coating lip (1) and a second coating lip (2), wherein a gasket is arranged between the first coating lip (1) and the second coating lip (2), and the gasket separates the first coating lip (1) and the second coating lip (2) to form a coating slit (3), and is characterized in that: the coating slit (3) is divided into two sections which are connected in sequence, the first section of the coating slit (31) is a straight slit, and the lower end of the straight slit is a discharge hole (311); the second section coating slit (32) is a cambered slit, a trough (33) communicated with the slit is arranged on the cambered slit, and the volume of the trough (33) is large, so that when the coating machine stops coating, the slurry can be temporarily stored in the trough (33) and does not flow down along the coating slit, and the pressure is basically not generated on the slurry in the coating slit.
2. The curved extrusion coating head of claim 1, wherein: the trough (33) is arranged at the high point of the cambered surface slit.
3. A curved extrusion coating head according to claim 1 or 2, wherein: and an upward-tilting extension slit (34) is arranged on one side of the cambered surface slit, which is far away from the straight surface slit.
4. The curved extrusion coating head of claim 3, wherein: the extension slit (34) is a straight slit.
5. The curved extrusion coating head of claim 3, wherein: the extension slit (34) is a curved slit.
6. A curved extrusion coating head according to claim 1 or 2, wherein the angle (α) between the straight slit and the horizontal plane is selected between 30 and 90 degrees.
7. The bend extrusion coating head of claim 3 wherein the angle (α) between the straight slit and the horizontal is selected between 30 and 90 degrees.
8. A curved extrusion coating head according to claim 4 or 5, wherein the angle (α) between the straight slit and the horizontal plane is selected between 30 and 90 degrees.
9. A curved extrusion coating head according to claim 1 or 2, wherein: a contact part (11) is arranged on the coating lip at the side far away from the discharge hole (4).
10. The curved extrusion coating head of claim 9, wherein: the bottom surface (111) of the contact part (11) is a plane or an arc surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810526769.5A CN108568380B (en) | 2018-05-26 | 2018-05-26 | Bend type extrusion coating head |
| PCT/CN2018/097870 WO2019227654A1 (en) | 2018-05-26 | 2018-08-01 | Curved-type press coating head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810526769.5A CN108568380B (en) | 2018-05-26 | 2018-05-26 | Bend type extrusion coating head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108568380A CN108568380A (en) | 2018-09-25 |
| CN108568380B true CN108568380B (en) | 2020-03-27 |
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ID=63572176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810526769.5A Active CN108568380B (en) | 2018-05-26 | 2018-05-26 | Bend type extrusion coating head |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108568380B (en) |
| WO (1) | WO2019227654A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2902238B2 (en) * | 1992-11-25 | 1999-06-07 | 花王株式会社 | Coating device and method |
| JP2003126761A (en) * | 2001-10-29 | 2003-05-07 | Konica Corp | Coating method |
| CN2749586Y (en) * | 2004-11-05 | 2006-01-04 | 鸿富锦精密工业（深圳）有限公司 | Multiple coating equipment |
| JP5587531B2 (en) * | 2007-07-19 | 2014-09-10 | ノードソン コーポレーション | Slot nozzle assembly, slot coat gun, and method for extruding foamable melt into wide strip |
| JP2011143388A (en) * | 2010-01-18 | 2011-07-28 | Clean Technology Kk | Thin film coating apparatus and double-sided thin film coating apparatus |
| CN104148238B (en) * | 2014-08-02 | 2016-08-24 | 深圳市信宇人科技有限公司 | Extrusion coated head and coating machine thereof |
| CN105921360B (en) * | 2016-07-01 | 2019-02-12 | 深圳市华星光电技术有限公司 | Gap nozzle and apparatus for coating |
-
2018
- 2018-05-26 CN CN201810526769.5A patent/CN108568380B/en active Active
- 2018-08-01 WO PCT/CN2018/097870 patent/WO2019227654A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019227654A1 (en) | 2019-12-05 |
| CN108568380A (en) | 2018-09-25 |
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