CN110639724A - Coating system and coating method - Google Patents
Coating system and coating method Download PDFInfo
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- CN110639724A CN110639724A CN201910800519.0A CN201910800519A CN110639724A CN 110639724 A CN110639724 A CN 110639724A CN 201910800519 A CN201910800519 A CN 201910800519A CN 110639724 A CN110639724 A CN 110639724A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
- B05B12/087—Flow or presssure regulators, i.e. non-electric unitary devices comprising a sensing element, e.g. a piston or a membrane, and a controlling element, e.g. a valve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
- B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
- B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
- B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
- B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
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Abstract
The embodiment of the invention relates to the technical field of display, and discloses a coating system, which comprises: a coating nozzle for spraying a coating liquid to the substrate; the viscosity detector is used for detecting the viscosity value of the coating liquid; and the coating controller is connected with the viscosity detector and the coating nozzle and is used for adjusting the spraying amount of the coating liquid of the coating nozzle according to the viscosity value measured by the viscosity detector. The embodiment of the invention provides a coating system and a coating method, which can be used for obtaining a film layer with better thickness uniformity.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a coating system and a coating method.
Background
In the production process of display panels, various films such as a substrate and a photoresist film are generally formed on a substrate by coating using a coating system. In particular production, coating devices generally employ nozzles for applying a corresponding coating liquid on a substrate, for example: substrate material, photoresist, etc. The basic working process of the coating device is as follows: the nozzle moves along the surface of the substrate from one side edge of the substrate to the opposite side edge at a certain speed, and meanwhile, the coating liquid is discharged from the nozzle at a certain speed, and along with the movement of the nozzle, the coating liquid can be coated on the surface of the substrate to form a corresponding film layer.
However, the conventional coating system has a problem that the thickness of the coating layer is not uniform.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a coating system and a coating method that can obtain a film having a uniform thickness.
To solve the above technical problem, an embodiment of the present invention provides a coating system including: a coating nozzle for spraying a coating liquid to the substrate; the viscosity detector is used for detecting the viscosity value of the coating liquid; and the coating controller is connected with the viscosity detector and the coating nozzle and is used for adjusting the spraying amount of the coating liquid of the coating nozzle according to the viscosity value measured by the viscosity detector.
The embodiment of the invention also provides a coating method, which is applied to the coating system, wherein the coating system comprises: a coating nozzle, a viscosity probe, and a coating controller connecting the viscosity probe and the coating nozzle; the coating method comprises the following steps: detecting the current viscosity value of the coating liquid by using a viscosity detector; the coating controller adjusts the amount of the coating liquid ejected from the coating nozzle according to the current viscosity value.
In addition, the coating nozzle includes: the coating liquid is sprayed out from between the two side walls; the coating controller is connected with two side walls of the coating nozzle; the coating controller is used for adjusting the distance between the two side walls of the coating nozzle so as to adjust the ejection amount of the coating liquid of the coating nozzle. In this embodiment, the ejection rate of the coating liquid from the coating nozzle is adjusted by adjusting the distance between the two sidewalls of the coating nozzle, and a specific embodiment of adjusting the ejection rate of the coating nozzle is provided.
In addition, still include: a liquid supply conduit connected to the coating nozzle; the liquid supply pipeline is used for supplying coating liquid to the coating nozzle; the coating controller adjusts the amount of the coating liquid ejected from the coating nozzle by controlling the amount of the liquid supplied from the liquid supply line. In this embodiment, the amount of the coating liquid to be discharged is adjusted by controlling the amount of the liquid supply line, and another specific embodiment of adjusting the amount of the coating liquid to be discharged from the coating nozzle is given.
In addition, still include: the pump is connected with the liquid supply pipeline and the coating controller and used for leading the coating liquid to the liquid supply pipeline; the coating controller is also used for adjusting the output pressure value of the coating liquid led out by the pump so as to adjust the supply quantity of the liquid supply pipeline. According to the scheme, the supply quantity of the liquid supply pipeline is adjusted by controlling the output pressure value of the coating liquid led out by the pump, and a specific implementation mode for adjusting the supply quantity of the liquid supply pipeline is provided.
In addition, still include: a liquid storage tank connected with the coating nozzle, wherein coating liquid is stored in the liquid storage tank; the viscosity detector is arranged in the liquid storage tank; preferably, the viscosity detector is a plurality of viscosity detectors, and the plurality of viscosity detectors are respectively arranged at different heights of the liquid storage tank. Through setting up a plurality of viscosity detectors on the not co-altitude of liquid storage pot in this scheme to detect the viscosity number of coating liquid on the co-altitude, make the current viscosity number that obtains more accurate.
In addition, the coating system further includes: a frequency controller; the frequency controller is connected with the viscosity detector; the frequency controller is used for counting viscosity value change data of the coating liquid in the historical coating process and controlling the detection frequency of the viscosity detector according to the viscosity value change data. According to the scheme, the frequency controller controls the detection frequency of the viscosity detector according to the viscosity value change data, so that the film thickness uniformity formed by coating of the coating system is better, multiple useless detections of the viscosity detector can be avoided, and the overall energy consumption of the coating system is reduced.
In addition, the coating nozzle includes: two side walls arranged oppositely; the coating controller is stored with the corresponding relation between the viscosity value and the coating parameter in advance, and the coating parameter at least comprises: the gap width of the coating nozzle; the coating controller adjusts the ejection amount of the coating liquid of the coating nozzle according to the current viscosity value, and specifically comprises: the coating controller determines the gap width of the coating nozzle according to the current viscosity value and the corresponding relation: and adjusting the distance between the two side walls of the coating nozzle according to the gap width so as to adjust the spraying amount of the coating liquid of the coating nozzle. In this embodiment, the ejection rate of the coating liquid from the coating nozzle is adjusted by adjusting the distance between the two sidewalls of the coating nozzle, and a specific embodiment of adjusting the ejection rate of the coating nozzle is provided.
In addition, the coating system further includes: a liquid supply pipeline connected with the coating nozzle, and a pump connected with the liquid supply pipeline and the coating controller; the coating controller is stored with the corresponding relation between the viscosity value and the coating parameter in advance, and the coating parameter at least comprises: the pressure value of the pump; the coating controller adjusts the ejection amount of the coating liquid of the coating nozzle according to the current viscosity value, and specifically comprises: the coating controller determines the pressure value of the pump according to the current viscosity value and the corresponding relation; and the liquid supply amount of the liquid supply pipeline is controlled according to the pressure value of the pump so as to adjust the spraying amount of the coating liquid of the coating nozzle. In the scheme, the output pressure value of the pump for leading out the coating liquid is controlled to adjust the supply quantity of the liquid supply pipeline so as to adjust the spraying quantity of the coating liquid, and another specific implementation mode for adjusting the spraying quantity of the coating nozzle is provided.
In addition, the coating system further includes: a frequency controller connected to the viscosity detector; before the viscosity detector is used for detecting the current viscosity value of the coating liquid, the method further comprises the following steps: counting viscosity value change data of the coating liquid in the historical coating process; determining the detection frequency of the current viscosity value according to the viscosity value change data; detecting the current viscosity value of the coating liquid by using a viscosity detector, specifically: and detecting the current viscosity value of the coating liquid by using a viscosity detector according to the detection frequency. According to the scheme, the frequency controller controls the detection frequency of the viscosity detector according to the viscosity value change data, so that the film thickness uniformity formed by coating of the coating system is better, multiple useless detections of the viscosity detector can be avoided, and the overall energy consumption of the coating system is reduced.
Compared with the prior art, the coating system has the advantages that the viscosity detector is used for detecting the viscosity value of the coating liquid, the coating controller is connected with the viscosity detector and the coating nozzle, and the spraying amount of the coating liquid of the coating nozzle is adjusted according to the viscosity value measured by the viscosity detector. The viscosity detector in the embodiment of the invention can monitor the viscosity change condition of the coating liquid in time, and the coating controller dynamically adjusts the spraying amount of the coating liquid according to the viscosity change condition of the coating liquid, so that the formed film thickness uniformity is better, and the problem of poor film thickness uniformity caused by the influence of the spraying amount of the coating liquid of the coating nozzle due to the change of the viscosity value of the coating liquid is solved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic view of a coating system according to a first embodiment of the present invention;
FIG. 2 is a schematic view of a coating system according to a second embodiment of the present invention;
FIG. 3 is a graph showing the change in viscosity of a transparent polyimide as a coating liquid according to a second embodiment of the present invention;
FIG. 4 is a schematic flow diagram of a coating process according to a third embodiment of the present invention;
fig. 5 is a schematic flow chart of a coating method according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
Since the basic operation process of the existing coating device is that the nozzle moves along the surface of the substrate from one side edge of the substrate to the opposite side edge at a certain speed, and the coating liquid is discharged from the nozzle at a certain speed, the coating liquid can be coated on the surface of the substrate to form a corresponding film layer along with the movement of the nozzle. The inventor finds that at least the following problems exist in the prior art: some conventional coating liquids have poor viscosity stability, the viscosity of the coating liquid changes with time during the coating process, and the change of the viscosity of the coating liquid can cause the uniformity of the thickness of the film layer to be poor.
A first embodiment of the present invention relates to a coating system, and as shown in fig. 1, the core of the present embodiment is a coating system including: a coating nozzle 1 for spraying a coating liquid to a substrate; a viscosity detector 2 for detecting the viscosity value of the coating liquid; and an application controller 3, the application controller 3 being connected to the viscosity detector 2 and the application nozzle 1, the application controller 3 being configured to adjust the discharge amount of the application liquid from the application nozzle 1 based on the viscosity value measured by the viscosity detector 2. The viscosity detector 2 in the embodiment of the invention can monitor the viscosity change condition of the coating liquid in time, and the coating controller 3 dynamically adjusts the spraying amount of the coating liquid according to the viscosity change condition of the coating liquid, so that the formed film thickness uniformity is better, and the problem of poor film thickness uniformity caused by the influence of the spraying amount of the coating liquid of the coating nozzle 1 due to the change of the viscosity value of the coating liquid is solved.
Implementation details of the coating system of the present embodiment are described in detail below, which are provided only for ease of understanding and are not necessary to practice the present embodiment.
In this embodiment, the coating liquid is a transparent polyimide (CPI) material, for example. The CPI material is a substrate material for flexible displays, which has a viscosity value that is subject to change and has poor viscosity stability, as shown in table 1 below:
TABLE 1
| Day (days) | Viscosity/mPa.S (Viscosity/mPa.s) |
| 0 | 2900 |
| 7 | 4900 |
| 14 | 6500 |
| 30 | 5900 |
| 60 | 4200 |
It can be seen that the viscosity value of the CPI material changes gradually with the passage of time, when the CPI material is used for preparing a flexible substrate, by using the coating system in the embodiment, the viscosity detector 2 of the coating system can monitor the viscosity change condition of the CPI material in time, and the coating controller 3 dynamically adjusts the ejection amount of the coating liquid according to the viscosity change condition of the CPI material, so that the uniformity of the thickness of the formed film layer is better, and the consistency of the thickness of the film layers of different substrates in the same batch is also ensured.
As a practical way, the coating nozzle 1 in the present embodiment includes: two side walls 11 arranged oppositely, and the coating liquid is sprayed out from between the two side walls 11; the coating controller 3 is connected to both side walls 11 of the coating nozzle 1; the coating controller 3 is used to adjust the interval between the two side walls 11 of the coating nozzle 1 to adjust the ejection amount of the coating liquid from the coating nozzle 1.
Specifically, in the present embodiment, the coating nozzle 1 is a slit nozzle including two side walls 11 which are provided to face each other, the coating liquid is discharged from between the two side walls 11, the coating controller 3 is connected to the two side walls 11 of the coating nozzle 1, and when it is necessary to adjust the discharge amount of the coating liquid from the coating nozzle 1, the coating controller 3 adjusts the distance between the two side walls 11 of the coating nozzle 1, thereby controlling the change in the discharge amount due to the viscosity change. The greater the viscosity of the coating liquid, the less the coating liquid is ejected from the coating nozzle 1 per unit time; the smaller the viscosity, the more coating liquid is ejected from the coating nozzle 1, and therefore, in the case where the moving speed of the coating nozzle 1 is not changed, the amount of coating liquid ejected from the coating nozzle 1 is changed according to the change in the viscosity of the coating liquid, so that the thickness of a film layer formed on a substrate is not uniform. In the present embodiment, when the viscosity of the coating liquid increases without changing the moving speed of the coating nozzle 1, the distance between the two side walls 11 of the coating nozzle 1 is increased to increase the ejection amount of the coating liquid; when the viscosity of the coating liquid is reduced, the distance between the two side walls 11 of the coating nozzle 1 is reduced, the spraying amount of the coating liquid is reduced, and the spraying amount of the coating nozzle 1 tends to be consistent, so that the problem that the spraying amount of the coating nozzle 1 is inconsistent due to the change of the viscosity is avoided, the uniformity of the thickness of the film layer formed by the coating system in the embodiment is better, and the consistency of the thickness of the film layer in the same batch is ensured.
The coating controller 3 stores in advance a correspondence relationship between a viscosity value of the coating liquid and coating parameters including at least: the gap width of the coating nozzle 1 (i.e. the gap width represents the vertical distance between the two side walls 11 of the coating nozzle 1). When the viscosity detector 2 detects the current viscosity value of the coating liquid, the coating controller 3 determines the gap width of the coating nozzle 1 according to the current viscosity value and the correspondence between the viscosity value and the gap width of the coating nozzle 1 stored in advance, and adjusts the distance between the two side walls 11 of the coating nozzle 1 according to the determined gap width of the coating nozzle 1.
As another implementable manner, the coating system further comprises: a liquid supply pipe 4 connected to the coating nozzle 1; the liquid supply pipe 4 is used for supplying the coating liquid to the coating nozzle 1; the coating controller 3 adjusts the ejection amount of the coating liquid from the coating nozzle 1 by controlling the supply amount of the liquid supply line 4.
Specifically, in the present embodiment, the coating nozzle 1 is connected to a liquid supply line 4, the liquid supply line 4 supplies the coating liquid to the coating nozzle 1, and when it is necessary to adjust the ejection amount of the coating liquid from the coating nozzle 1, the coating controller 3 adjusts the supply amount of the liquid supply line 4 to control a change in the ejection amount due to a change in viscosity. Increasing the supply amount of the liquid supply pipe 4 when the viscosity of the coating liquid becomes high without changing the moving speed of the coating nozzle 1, thereby increasing the ejection amount of the coating liquid from the coating nozzle 1; when the viscosity of the coating liquid becomes small, the supply amount of the liquid supply pipe 4 is reduced, so that the spraying amount of the coating liquid of the coating nozzle 1 is reduced, the spraying amount of the coating nozzle 1 tends to be consistent, the problem that the spraying amount of the coating nozzle 1 is inconsistent due to viscosity change is avoided, the uniformity of the thickness of the film layer formed by the coating system in the embodiment is better, and the consistency of the thickness of the film layer in the same batch is ensured.
Further, the coating system further comprises: a pump 5 connected to the liquid supply pipe 4 and the coating controller 3, the pump 5 being configured to introduce the coating liquid to the liquid supply pipe 4; the coating controller 3 is also used for adjusting the output pressure value of the coating liquid led out by the pump 5 so as to adjust the supply amount of the liquid supply pipeline 4. The output pressure value of the coating liquid led out by the pump 5 can be adjusted, and when the viscosity of the coating liquid becomes higher and the supply amount of the liquid supply pipeline 4 needs to be increased, the output pressure value of the pump 5 is increased; when the viscosity of the coating liquid becomes small and the supply amount of the liquid supply pipe 4 needs to be reduced, the output pressure value of the pump 5 is lowered.
The coating controller 3 stores in advance a correspondence relationship between a viscosity value of the coating liquid and coating parameters including at least: the pressure value of the pump 5. When the viscosity detector 2 detects the current viscosity value of the coating liquid, the coating controller 3 determines the output pressure value of the coating liquid drawn by the pump 5 according to the current viscosity value and the corresponding relationship between the viscosity value and the pressure value of the pump 5, which is stored in advance, and adjusts the supply amount of the liquid supply pipe 4 according to the determined output pressure value of the coating liquid drawn by the pump 5 to adjust the ejection amount of the coating liquid of the coating nozzle 1.
Further, the coating system further comprises: a liquid storage tank 6 connected with the coating nozzle 1, wherein the liquid storage tank 6 stores the coating liquid; the viscosity detector 2 is arranged in the liquid storage tank 6.
Specifically, the coating system in this embodiment further includes: a liquid storage tank 6 storing the coating liquid, a viscosity detector 2 is arranged in the liquid storage tank 6, the viscosity value of the coating liquid in the liquid storage tank 6 is directly detected, and the spraying amount of the coating liquid of the coating nozzle 1 is adjusted according to the obtained viscosity value.
It is worth to be noted that the pump 5 is connected to the liquid storage tank 6 through a pipeline, and is connected to the coating nozzle 1 through the liquid supply pipeline 4, the viscosity detector 2 can be arranged at the inlet of the pipeline of the pump 5 connected to the liquid storage tank 6, and the spraying amount of the coating liquid of the coating nozzle 1 can be adjusted by detecting the viscosity value of the coating liquid of the pipeline.
However, the above-mentioned arrangement mode of arranging the viscosity detector 2 at the inlet of the pipe connecting the pump 5 and the liquid storage tank 6 is another preferable arrangement mode of the viscosity detector 2 in the present embodiment because the flow rate of the coating liquid around the viscosity detector 2 is fast and it is not easy to accurately measure the coating liquid. The viscosity detectors 2 are arranged on different heights of the liquid storage tank 6 respectively, the viscosity values of the coating liquid on different heights in the liquid storage tank 6 are detected, the average value of the viscosity values of the coating liquid on different heights obtained through detection can be obtained, and the average value is used as the current viscosity value of the coating liquid. Through setting up a plurality of viscosity detector 2 on the not co-altitude of liquid storage pot 6 to detect the viscosity number of coating liquid on the co-altitude, make the current viscosity number that obtains more accurate.
Compared with the prior art, the coating system provided by the embodiment of the invention comprises a coating nozzle 1, a coating liquid spraying device and a coating liquid spraying device, wherein the coating nozzle is used for spraying coating liquid to a substrate; a viscosity detector 2 for detecting the viscosity value of the coating liquid; and a coating controller 3 connected to the viscosity detector 2 and the coating nozzle 1, wherein the coating controller 3 is configured to adjust an amount of the coating liquid discharged from the coating nozzle 1 based on the viscosity value measured by the viscosity detector 2. The viscosity detector 2 in the embodiment of the invention can monitor the viscosity change condition of the coating liquid in time, and the coating controller 3 dynamically adjusts the spraying amount of the coating liquid according to the viscosity change condition of the coating liquid, so that the formed film thickness uniformity is better, and the problem of poor film thickness uniformity caused by the influence of the spraying amount of the coating liquid of the coating nozzle 1 due to the change of the viscosity value of the coating liquid is solved.
A second embodiment of the present invention is directed to a coating system. As shown in fig. 2, the second embodiment is a further improvement of the first embodiment, and the main improvements are as follows: the coating system further comprises: the frequency controller 7 is used for determining the detection frequency of the viscosity detector 2 by counting viscosity value change data in the historical coating process, and the frequency controller 7 is connected with the viscosity detector 2; the frequency controller 7 is used for counting viscosity value change data of the coating liquid in the historical coating process and controlling the detection frequency of the viscosity detector 2 according to the viscosity value change data. The thickness uniformity of a film layer formed by coating of the coating system is better, multiple useless detections of the viscosity detector 2 can be avoided, and the overall energy consumption of the coating system is reduced.
The coating system in this embodiment further includes: a frequency controller 7; the frequency controller 7 is connected with the viscosity detector 2; the frequency controller 7 is used for counting viscosity value change data of the coating liquid in the historical coating process and controlling the detection frequency of the viscosity detector 2 according to the viscosity value change data.
Specifically, the coating system in the present embodiment further includes a frequency controller 7, and the frequency controller 7 counts real-time change data of the viscosity value of the coating liquid in the history coating process, for example: as can be seen from fig. 3, the viscosity values of the CPI rose faster between 0 and 15 days, whereas the viscosity values declined smoothly between 15 and 30 days, and declined faster after 30 days. If the viscosity detector 2 frequently detects the viscosity value of the coating liquid between 15 days and 30 days, it is likely that the viscosity value between two adjacent viscosity values is small or even negligible, and at this time, the viscosity value measured by the viscosity detector 2 does not play a role as a basis for adjusting the ejection amount of the coating liquid from the coating nozzle 1, but rather increases the energy consumption of the entire coating system. Therefore, in the present embodiment, when the detection frequency of the viscosity probe 2 is controlled according to the viscosity value, the detection frequency can be reduced between 15 and 30 days when the viscosity value changes gently; and after 0-15 days and 30 days, namely, in the time period of rapid change of the viscosity value, the detection frequency is increased, so that the film thickness uniformity formed by coating of the coating system can be ensured to be better, the viscosity detector 2 can be prevented from detecting for multiple times, and the overall energy consumption of the coating system is reduced.
It should be noted that the frequency controller 7 in this embodiment may be a separate device, or may be integrated into the coating controller 3 or the viscosity detector 2.
Compared with the prior art, the coating system provided in the embodiment of the invention further comprises: the frequency controller 7, the frequency controller 7 connects the viscosity detector 2; the frequency controller 7 is used for counting viscosity value change data of the coating liquid in the historical coating process and controlling the detection frequency of the viscosity detector 2 according to the viscosity value change data. The thickness uniformity of a film layer formed by coating of the coating system is better, multiple useless detections of the viscosity detector 2 can be avoided, and the overall energy consumption of the coating system is reduced.
It should be noted that the second embodiment of the present invention is an improvement of the first embodiment, and in practical applications, implementation details of the second embodiment may be applied to the first embodiment, and the first embodiment may be used in combination with the second embodiment.
A third embodiment of the present invention relates to a coating method applied to the coating system according to any one of the above embodiments, as shown in fig. 4, the coating method including:
step 101: the current viscosity value of the coating liquid was measured.
Step 102: and determining the gap width of the coating nozzle according to the current viscosity value and the corresponding relation.
Step 103: the distance between the two side walls of the coating nozzle is adjusted according to the gap width to adjust the ejection amount of the coating liquid of the coating nozzle.
Specifically, the coating system includes, for the above steps 101 to 103: an application nozzle 1, a viscosity probe 2, and an application controller 3 connecting the viscosity probe 2 and the application nozzle 1. The coating nozzle 1 includes: since the coating controller 3 of the coating system stores the correspondence between the viscosity value of the coating liquid and the gap width of the coating nozzle 1 (the gap width indicates the vertical distance between the two side walls 11 of the coating nozzle 1), when the viscosity detector 2 of the coating system detects the current viscosity value of the coating liquid, the coating controller 3 determines the gap width of the coating nozzle 1 based on the current viscosity value and the correspondence between the viscosity value and the gap width of the coating nozzle 1 stored in advance, and adjusts the distance between the two side walls 11 of the coating nozzle 1 based on the determined gap width of the coating nozzle 1 to adjust the amount of the coating liquid discharged from the coating nozzle 1. The greater the viscosity of the coating liquid, the less the coating liquid is ejected from the coating nozzle 1 per unit time; the smaller the viscosity, the more coating liquid is ejected from the coating nozzle 1, and therefore, in the case where the moving speed of the coating nozzle 1 is not changed, the amount of coating liquid ejected from the coating nozzle 1 is changed according to the change in the viscosity of the coating liquid, so that the thickness of a film layer formed on a substrate is not uniform. In the present embodiment, when the viscosity of the coating liquid increases without changing the moving speed of the coating nozzle 1, the distance between the two side walls 11 of the coating nozzle 1 is increased to increase the ejection amount of the coating liquid; when the viscosity of the coating liquid is reduced, the distance between the two side walls 11 of the coating nozzle 1 is reduced, the spraying amount of the coating liquid is reduced, and the spraying amount of the coating nozzle 1 tends to be consistent, so that the problem that the spraying amount of the coating nozzle 1 is inconsistent due to the change of the viscosity is avoided, the uniformity of the thickness of the film layer formed by the coating system in the embodiment is better, and the consistency of the thickness of the film layer in the same batch is ensured.
Further, the coating system further comprises: a frequency controller 7 connected with the viscosity detector 2; before detecting the current viscosity value of the coating liquid by using the viscosity detector 2, the method further comprises the following steps: counting viscosity value change data of the coating liquid in the historical coating process; determining the detection frequency of the current viscosity value according to the viscosity value change data; the viscosity detector 2 is used for detecting the current viscosity value of the coating liquid, and specifically comprises the following steps: and detecting the current viscosity value of the coating liquid by using the viscosity detector 2 according to the detection frequency.
Specifically, if the viscosity detector 2 frequently detects the viscosity values of the coating liquid in a time period in which the viscosity changes steadily, the viscosity values measured in two adjacent times are likely to be very small or even negligible, and at this time, the viscosity value measured by the viscosity detector 2 cannot serve as a basis for adjusting the spraying amount of the coating liquid of the coating nozzle 1, and the energy consumption of the whole coating system is increased. In the embodiment, the frequency controller 7 of the coating system counts the real-time change data of the viscosity value of the coating liquid in the historical coating process, controls the detection frequency of the viscosity detector 2 according to the viscosity value, and can reduce the detection frequency in the time period when the viscosity value changes smoothly; and in the time period when the viscosity value changes rapidly, the detection frequency is increased, so that the film thickness uniformity formed by coating the coating system can be ensured to be good, the viscosity detector 2 can be prevented from detecting for multiple times, and the overall energy consumption of the coating system is reduced.
Compared with the prior art, the embodiment provides a coating method applied to a coating system, and the coating method comprises the following steps: detecting the current viscosity value of the coating liquid; the spraying amount of the coating liquid of the coating nozzle 1 is adjusted according to the current viscosity value, so that the problem of inconsistent spraying amount of the coating nozzle 1 caused by viscosity change is avoided, the uniformity of the thickness of the film layer formed by the coating system in the embodiment is better, and the consistency of the thickness of the film layer in the same batch is ensured.
A fourth embodiment of the present invention relates to a coating method, as shown in fig. 5, applied to any one of the above-described coating systems. The coating method in the present embodiment is substantially the same as that in the first embodiment, except that the amount of supply of the liquid supply line 4 is controlled to adjust the ejection amount of the coating liquid from the coating nozzle 1 in the present embodiment, and another specific embodiment of adjusting the ejection amount of the coating liquid from the coating nozzle 1 is given.
The coating method in the present embodiment includes:
step 201: detecting the current viscosity value of the coating liquid;
step 202: and determining the pressure value of the pump according to the current viscosity value and the corresponding relation.
Step 203: the liquid supply amount of the liquid supply pipe is controlled according to the pressure value of the pump so as to adjust the spraying amount of the coating liquid of the coating nozzle.
Specifically, with respect to the above steps 201 to 203, the coating system further includes: a liquid supply pipe 4 connected with the coating nozzle 1, and a pump 5 connected with the liquid supply pipe 4 and the coating controller 3. Since the coating controller 3 of the coating system stores the corresponding relationship between the viscosity value of the coating liquid and the pressure value of the pump 5, when the viscosity detector 2 detects the current viscosity value of the coating liquid, the coating controller 3 determines the output pressure value of the coating liquid drawn by the pump 5 according to the current viscosity value and the corresponding relationship between the viscosity value and the pressure value of the pump 5, which is stored in advance, and adjusts the supply amount of the liquid supply pipe 4 according to the determined output pressure value of the coating liquid drawn by the pump 5 to adjust the ejection amount of the coating liquid from the coating nozzle 1. When the viscosity of the coating liquid becomes higher, the output pressure value of the pump 5 is increased to increase the supply amount of the liquid supply pipe 4, thereby increasing the ejection amount of the coating liquid from the coating nozzle 1; when the viscosity of the coating liquid becomes lower, the output pressure value of the pump 5 is reduced to reduce the supply amount of the liquid supply pipeline 4, so that the spraying amount of the coating liquid of the coating nozzle 1 is reduced, the spraying amount of the coating nozzle 1 tends to be consistent, the problem that the spraying amount of the coating nozzle 1 is inconsistent due to viscosity change is avoided, the uniformity of the thickness of the film layer formed by the coating system in the embodiment is better, and the uniformity of the thickness of the film layer of the same batch is ensured.
In contrast to the prior art, the present embodiment provides a coating method that adjusts the ejection amount of the coating liquid from the coating nozzle 1 by controlling the supply amount of the liquid supply line 4, and provides another specific implementation of adjusting the ejection amount of the coating liquid from the coating nozzle 1.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A coating system, comprising:
a coating nozzle for spraying a coating liquid to the substrate;
the viscosity detector is used for detecting the viscosity value of the coating liquid;
and the coating controller is connected with the viscosity detector and the coating nozzle and is used for adjusting the spraying amount of the coating liquid of the coating nozzle according to the viscosity value measured by the viscosity detector.
2. The coating system of claim 1, wherein the coating nozzle comprises: the coating liquid is sprayed out from between the two side walls; the coating controller is connected with two side walls of the coating nozzle;
the coating controller is used for adjusting the distance between the two side walls of the coating nozzle so as to adjust the ejection quantity of the coating liquid of the coating nozzle.
3. The coating system of claim 1, further comprising: a liquid supply conduit connected to the coating nozzle; the liquid supply pipeline is used for supplying coating liquid to the coating nozzle;
the coating controller adjusts the spraying amount of the coating liquid of the coating nozzle by controlling the supply amount of the liquid supply pipeline.
4. The coating system of claim 3, further comprising: a pump connected to the liquid supply conduit and the coating controller, the pump being configured to introduce coating liquid to the liquid supply conduit;
the coating controller is also used for adjusting the output pressure value of the coating liquid led out by the pump so as to adjust the supply quantity of the liquid supply pipeline.
5. The coating system of claim 1, further comprising: the liquid storage tank is connected with the coating nozzle, and coating liquid is stored in the liquid storage tank; the viscosity detector is arranged in the liquid storage tank;
preferably, the viscosity detector is a plurality of viscosity detectors, and the viscosity detectors are respectively arranged at different heights of the liquid storage tank.
6. The coating system of claim 1, further comprising: a frequency controller; the frequency controller is connected with the viscosity detector;
the frequency controller is used for counting viscosity value change data of the coating liquid in the historical coating process and controlling the detection frequency of the viscosity detector according to the viscosity value change data.
7. A coating method, applied to a coating system, the coating system comprising: a coating nozzle, a viscosity probe, and a coating controller connecting the viscosity probe and the coating nozzle;
the coating method comprises the following steps:
detecting the current viscosity value of the coating liquid by using the viscosity detector;
and the coating controller adjusts the spraying amount of the coating liquid of the coating nozzle according to the current viscosity value.
8. Coating method according to claim 7, characterized in that said coating nozzle comprises: two side walls arranged oppositely; the coating controller is stored with a corresponding relation between the viscosity value and the coating parameters in advance, and the coating parameters at least comprise: a gap width of the coating nozzle;
the coating controller adjusts the ejection amount of the coating liquid of the coating nozzle according to the current viscosity value, and specifically comprises:
the coating controller determines the gap width of the coating nozzle according to the current viscosity value and the corresponding relation;
and adjusting the distance between the two side walls of the coating nozzle according to the gap width so as to adjust the ejection amount of the coating liquid of the coating nozzle.
9. The coating method of claim 7, wherein the coating system further comprises: the coating controller comprises a liquid supply pipeline connected with the coating nozzle and a pump connected with the liquid supply pipeline and the coating controller; the coating controller is stored with a corresponding relation between the viscosity value and the coating parameters in advance, and the coating parameters at least comprise: the pressure value of the pump;
the coating controller adjusts the ejection amount of the coating liquid of the coating nozzle according to the current viscosity value, and specifically comprises:
the coating controller determines the pressure value of the pump according to the current viscosity value and the corresponding relation;
and the liquid supply amount of the liquid supply pipeline is controlled according to the pressure value of the pump so as to adjust the spraying amount of the coating liquid of the coating nozzle.
10. The coating method of claim 7, wherein the coating system further comprises: a frequency controller connected to the viscosity detector; before the current viscosity value of the coating liquid is detected by the viscosity detector, the method further comprises the following steps:
counting viscosity value change data of the coating liquid in a historical coating process;
determining the detection frequency of the current viscosity value according to the viscosity value change data;
the method for detecting the current viscosity value of the coating liquid by using the viscosity detector specifically comprises the following steps: and detecting the current viscosity value of the coating liquid by using the viscosity detector according to the detection frequency.
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