JP2007268521A - Pretreatment apparatus for coating film forming apparatus, pretreatment method for coating film forming apparatus, coating film forming apparatus, and coating film forming method - Google Patents

Abstract

To provide a pretreatment apparatus for a coating film forming apparatus capable of remarkably improving economy and maintainability.
A pretreatment apparatus for a coating film forming apparatus includes a priming roller, a circulating solvent supply nozzle, a scraping doctor blade, and a suction means. The coating liquid 110 is discharged from the coating liquid supply nozzle 100 to the priming roller 16. The circulating solvent supply nozzle 18 supplies a solvent to the coating liquid 110 discharged onto the priming roller 16. The scraping doctor blade 20 is arranged so that the tip thereof is pressed against and contacted with the priming roller 16 from below and scrapes the coating liquid 110 and the solvent on the priming roller 16. The suction means 120 has a suction port 36 and a vacuum pump 52, and sucks the coating liquid 110 and the solvent scraped by the scraping doctor blade 20 from the suction port 36 by the suction pump 52.
[Selection] Figure 1

Description

  The present invention relates to a pretreatment apparatus for a coating film forming apparatus, a pretreatment method for a coating film forming apparatus, a coating film forming apparatus, and a coating film forming method.

Conventionally, in order to apply a coating solution that is a mixture of a solute and a solvent uniformly on a substrate, the coating solution is discharged onto a priming roller before the coating solution is applied to the substrate, thereby applying the coating film forming apparatus. There is known a pretreatment device for a coating film forming apparatus that adjusts a protruding amount of a coating liquid from a liquid supply nozzle (see, for example, Patent Documents 1 to 4).
JP 2005-329340 A JP 2004-167476 A JP 2005-252045 A Special table 2002-500097 gazette

  By the way, in the pretreatment device for the coating film forming apparatus, the coating liquid discharged before remains on the priming roller, or the remaining coating liquid dries and the solute solidifies to become foreign matter. Then, when it is going to adjust the protrusion amount of the coating liquid from a nozzle, it will become impossible to adjust correctly, Therefore It is requested | required that a coating liquid should be reliably removed from a priming roller. Therefore, the above-described conventional pretreatment device for a coating film forming apparatus includes a solvent supply nozzle that supplies a solvent to the coating liquid on the priming roller in order of the rotation direction of the priming roller, and a coating liquid and a solvent on the priming roller. And a solvent tank storing a solvent for cleaning the priming roller. Thus, the reason why the doctor blade and the solvent tank are passed through is that the coating liquid cannot be completely removed from the priming roller only by the doctor blade or the solvent tank alone. In this solvent supply nozzle, a circulating solvent obtained by circulating the solvent in the solvent tank through a pipe is supplied onto the priming roller.

  However, in the conventional pretreatment device for a coating film forming apparatus, a part of the coating liquid that has not been scraped off by the doctor blade wraps around the back of the doctor blade, and a large amount of the coating liquid remains on the priming roller. was there. If it does so, the density | concentration of the solute in the coating liquid in the solvent in a solvent tank will increase immediately. Therefore, in order to dilute the concentration of the solute in the coating solution in the solvent in the solvent tank, it is necessary to replenish a new solvent in a large amount, and there is a problem that the economy is deteriorated.

  At the same time, the solute in the coating liquid scraped off by the doctor blade solidifies and adheres to members around the doctor blade, so that maintenance work such as cleaning and replacement of the doctor blade must be performed regularly. was there. Therefore, it was necessary to use a large amount of circulating solvent in order to suppress adhesion of solutes to members around the doctor blade. If it does so, since the liquid level of a solvent tank will fall, it will be necessary to supply a new solvent to a solvent tank, and the further economical deterioration was caused. In order to prevent the liquid level in the solvent tank from being lowered, it may be possible to return the coating liquid scraped by the doctor blade to the solvent tank, but the concentration of the solute in the coating liquid in the solvent in the solvent tank eventually increases. Therefore, it was necessary to supply a new solvent to the solvent tank, and the economic efficiency was unavoidable.

  The present invention provides a pretreatment apparatus for a coating film forming apparatus, a pretreatment method for a coating film forming apparatus, a coating film forming apparatus, and a coating film forming method capable of significantly improving economy and maintainability. With the goal.

  A pretreatment apparatus for a coating film forming apparatus according to the present invention supplies a solvent to a priming roller from which a coating liquid is discharged from a coating liquid supply nozzle of the coating film forming apparatus and the coating liquid discharged onto the priming roller. Solvent supply means, a doctor blade that contacts the priming roller and scrapes off the coating liquid and the solvent on the priming roller, and a suction means that sucks the coating liquid and the solvent scraped off by the doctor blade.

  In the pretreatment apparatus for a coating film forming apparatus according to the present invention, the solvent is supplied to the coating liquid on the priming roller by the solvent supply means, and the coating liquid and the solvent on the priming roller are scraped off by the doctor blade, and further removed. The applied coating liquid and solvent are sucked by a suction means. For this reason, the scraped coating solution and solvent are less likely to go around the back of the doctor blade, and the solution is hardly carried over to the subsequent solvent tank. Therefore, the concentration of the solute in the coating liquid in the solvent in the solvent tank is extremely low. Can be kept low. As a result, the replenishment amount of the solvent can be extremely reduced, and the economic efficiency is remarkably improved. At the same time, since the solute in the coating solution thus scraped off hardly solidifies and adheres to members around the doctor blade, the maintainability is remarkably improved. As a result, the amount of the solvent supplied from the solvent supply means can be greatly reduced, and further economic efficiency can be improved.

  Here, the suction means includes a doctor blade extending over the entire length of the priming roller and a plate-like body extending over the entire length of the priming roller so as to cover the surface of the doctor blade on the side where the coating liquid is scraped off. It is preferable to have a suction port formed by In this way, since the suction port is integrated with the doctor blade, the structure of the suction port can be simplified, and the coating solution and the The solvent can be efficiently and more reliably sucked by the suction means.

  Further, the suction means has a temporary storage means for temporarily storing the sucked coating liquid and solvent, and the coating film forming apparatus pretreatment device includes the coating liquid temporarily stored in the temporary storage means and It is preferable to further include a discharging means for discharging the solvent.

  On the other hand, the pretreatment method for a coating film forming apparatus according to the present invention includes a discharging step of discharging the coating liquid from the coating liquid supply nozzle of the coating film forming apparatus to the priming roller, and a coating liquid discharged on the priming roller. In contrast, a solvent supplying process for supplying a solvent, and a removing process for removing the coating liquid and the solvent on the priming roller by the doctor blade contacting the priming roller and sucking the coating liquid and the solvent scraped by the doctor blade. Prepare.

  In the pretreatment method for a coating film forming apparatus according to the present invention, a solvent is supplied to the coating liquid discharged onto the priming roller, and the coating liquid and the solvent on the priming roller are scraped off by a doctor blade, and then further scraped off. The applied coating solution and solvent are sucked. For this reason, the scraped coating solution and solvent are less likely to go around the back of the doctor blade, and the solution is hardly carried over to the subsequent solvent tank. Therefore, the concentration of the solute in the coating liquid in the solvent in the solvent tank is extremely low. Can be kept low. As a result, the replenishment amount of the solvent can be extremely reduced, and the economic efficiency is remarkably improved. At the same time, since the solute in the coating solution thus scraped off hardly solidifies and adheres to members around the doctor blade, the maintainability is remarkably improved. As a result, the amount of the solvent supplied from the solvent supply means can be greatly reduced, and further economic efficiency can be improved.

  The coating film forming apparatus according to the present invention includes a gravure roller to which a coating liquid is supplied, a doctor blade that contacts the gravure roller and scrapes the coating liquid on the gravure roller, and a coating liquid that is scraped off by the doctor blade And suction means for sucking.

  In the coating film forming apparatus according to the present invention, the scraped coating liquid is sucked by the suction means while the coating liquid supplied onto the gravure roller is scraped by the doctor blade. Therefore, it becomes difficult for the scraped-off coating liquid to wrap around the back of the doctor blade, and the coating liquid is hardly carried over. At the same time, since the solute in the coating solution thus scraped off hardly solidifies and adheres to members around the doctor blade, the maintainability is remarkably improved.

  Here, the suction means includes a doctor blade extending over the entire length of the gravure roller and a plate-like body extending over the entire length of the gravure roller so as to cover the surface of the doctor blade on the side where the coating liquid is scraped off. It is preferable to have a suction port formed by In this way, since the suction port is integrated with the doctor blade, the structure of the suction port can be simplified, and the scraped coating liquid can be efficiently removed while scraping the coating liquid with the doctor blade. Suction can be performed more reliably by the suction means.

  Further, the suction means has temporary storage means for temporarily storing the sucked application liquid, and the coating film forming apparatus further includes a discharge means for discharging the application liquid temporarily stored in the temporary storage means. It is preferable to provide.

  On the other hand, in the coating film forming method according to the present invention, the coating liquid supply step for supplying the coating liquid to the gravure roller, the coating liquid on the gravure roller is scraped off by the doctor blade, and the doctor blade is used. And a removing step of sucking the scraped application liquid.

  In the coating film forming method according to the present invention, the coating liquid supplied onto the gravure roller is scraped by a doctor blade, and then the scraped coating liquid is sucked. For this reason, the scraped coating liquid and solvent are less likely to go around the back of the doctor blade, and the coating liquid is hardly carried over. At the same time, since the solute in the coating solution thus scraped off hardly solidifies and adheres to members around the doctor blade, the maintainability is remarkably improved.

  According to the present invention, there are provided a pretreatment apparatus for a coating film forming apparatus, a pretreatment method for a coating film forming apparatus, and a coating film forming apparatus and a coating film forming method capable of significantly improving economy and maintainability. can do.

  Preferred embodiments of the present invention will be described with reference to the drawings. Note that in the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

(Configuration of pretreatment apparatus for coating film forming apparatus)
With reference to FIG.1 and FIG.2, the structure of the pre-processing apparatus 10 for coating film forming apparatuses which concerns on this embodiment is demonstrated. FIG. 1 is a schematic diagram showing the overall configuration of a pretreatment apparatus for a coating film forming apparatus according to this embodiment. FIG. 2 is an enlarged view showing a scraping doctor blade portion of the pretreatment device for a coating film forming apparatus according to the present embodiment.

  The pretreatment device 10 for a coating film forming apparatus moves the coating liquid supply nozzle 100 of the coating film forming apparatus onto a substrate (not shown) and before the coating liquid 110 is applied to the substrate, This is an apparatus for adjusting the amount of protrusion of the coating liquid 110 from the coating liquid supply nozzle 100. For this purpose, the coating film forming apparatus pretreatment apparatus 10 collects the pretreatment apparatus main body 12 from which the coating liquid 110 is discharged from the coating liquid supply nozzle 100 and the coating liquid 110 discharged from the coating liquid supply nozzle 100. And a waste liquid processing unit 14 for disposal. The coating liquid 110 used in the present embodiment may be a mixture of a solute and a solvent, such as a black matrix forming coating liquid, a patterning resist forming coating liquid, a colored resin region forming coating liquid, and a spacer formation. Various coating liquids such as a mixture of a resin and a solvent such as a coating liquid for coating, a coating liquid for forming a protective layer, and a coating liquid for forming an oxygen barrier film can be used.

  The pretreatment device main body 12 includes a priming roller 16 in the center, and a circulating solvent supply nozzle 18 (solvent supply means) is arranged in the order of the rotation direction of the priming roller 16 (the direction of arrow A shown in FIGS. 1 and 2). ), A scraping doctor blade 20, a solvent tank 22, a new solvent supply nozzle 24, a liquid draining doctor blade 26, and a drying gas injection nozzle 28.

  The priming roller 16 has a substantially cylindrical outer shape, and is provided so as to be rotatable with respect to the pretreatment device main body 12 in the arrow A direction shown in FIGS. 1 and 2. The priming roller 16 receives the coating liquid 110 discharged from the coating liquid supply nozzle 100 while rotating, thereby adjusting the shape of the coating liquid 110 at the tip of the coating liquid supply nozzle 100. The total length of the priming roller 16 is preferably slightly longer than the total length of the coating liquid supply nozzle 100.

  The circulating solvent supply nozzle 18 supplies the solvent (circulating solvent) in the solvent tank 22 circulated in the pipes 32 and 18 a by the pump 30 to the coating liquid 110 discharged to the priming roller 16. Thus, by supplying the solvent to the coating liquid 110 by the circulating solvent supply nozzle 18, the coating liquid 110 adhering to the priming roller 16 is washed away from the priming roller 16, and the coating liquid 110 can be easily scraped off. In addition, the solute of the coating solution is prevented from being solidified and clogged in the suction port 36 and the like which will be described later. In the circulating solvent supply nozzle 18, the solvent supply port 18b is close to the priming roller 16 to prevent evaporation of the solvent.

  The scraping doctor blade 20 is made of, for example, a resin material such as Polyether Ether Keton (PEEK), polyethylene, polyacetal, polyester, Teflon (registered trademark), or a metal material such as stainless steel or aluminum. It is a shape body, and the front-end | tip is arrange | positioned so that it may press against the priming roller 16 from diagonally downward and may contact. Therefore, the scraping doctor blade 20 can scrape the coating liquid 110 and the circulating solvent that have reached the scraping doctor blade 20 by the rotation of the priming roller 16. The thickness of the scraping doctor blade 20 can be about 500 μm, for example. Note that the scraping doctor blade 20 may be disposed such that the tip thereof is pressed against the priming roller 16 from the horizontal direction or obliquely upward. In addition, it is preferable to form the scraping doctor blade 20 from polyethylene because the scraping doctor blade 20 can perform soft and supple doctoring (scraping).

  The cross-sectional shape of the tip of the scraping doctor blade 20 can be various shapes. For example, specifically, as shown in FIG. 3A, a bevel shape with a gradually narrowing width toward the tip may be used, or a step shape as shown in FIG. It may be rectangular as shown in c). In these scraping doctor blades 20 shown in FIGS. 3A to 3C, the corner 20C at the tip of the surface opposite to the surface (scraping surface) S on which the coating liquid 110 is scraped, It contacts the priming roller 16. In addition, when the tip of the scraping doctor blade 20 is beveled, it is preferable that the coating liquid 110 and the solvent can be scraped efficiently because the surface has good adhesion to the mirror-finished priming roller 16. . At this time, the inclination angle θ of the tip can be, for example, about 15 ° (see FIG. 3A).

  In addition, a plate-like body 34 is provided above the scraping doctor blade 20 so as to cover the surface (scraping surface) S of the scraping doctor blade 20 on the side where the coating liquid 110 is scraped. The plate-like body 34 is disposed such that the tip thereof is separated from the priming roller 16 by, for example, about 0.3 mm to 0.5 mm, and separated from the scraping doctor blade 20 by, for example, about 2 mm. The scraping doctor blade 20 and the plate-like body 34 form a slit-like suction port 36 for sucking the coating liquid 110 and the circulating solvent by a vacuum pump 52 described later (see FIG. 2). The suction port 36 is connected to a trap tank 48 described later via a pipe 40. The scraping doctor blade 20 and the plate-like body 34 extend over the entire length of the priming roller 16, and the total length is preferably slightly longer than the total length of the coating liquid supply nozzle 100.

  The solvent tank 22 is a container for storing a solvent. The solvent tank 22 stores a solvent enough to immerse about ¼ of the diameter of the priming roller 16. Therefore, when the coating liquid 110 that has not been scraped off by the scraping doctor blade 20 remains on the priming roller 16, the priming roller 16 is rinsed by immersing the priming roller 16 in the solvent in the solvent tank 22. The coating liquid 110 is removed from the priming roller 16.

  The new solvent supply nozzle 24 supplies new solvent to the priming roller 16. Therefore, the priming roller 16 is rinsed twice, and the surface of the priming roller 16 is further purified. The solvent supplied from the new solvent supply nozzle 24 flows down from the priming roller 16 and is stored in the solvent tank 22. Here, in the new solvent supply nozzle 24, since the solvent in the solvent tank 22 is sucked by the pump 30 toward the circulating solvent supply nozzle 18 and used as the circulating solvent, a new solvent is supplied. The amount of solvent in 22 is constant. Examples of the solvent supplied from the new solvent supply nozzle 24 include propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, n-methyl-2-pyrrolidone, and cyclohexanone.

  The liquid draining doctor blade 26 drains the solvent supplied from the new solvent supply nozzle 24 to the priming roller 16. Further, the drying gas spray nozzle 28 sprays a drying gas introduced from the outside onto the surface of the priming roller 16 to dry the surface of the priming roller 16.

  Here, the new solvent supply nozzle 24 and the liquid cutting doctor blade 26 also extend over the entire length of the priming roller 16, and it is preferable that these total lengths are slightly longer than the total length of the coating liquid supply nozzle 100.

  On the other hand, the waste liquid processing unit 14 includes a trap tank (temporary storage means) 48, a waste liquid tank 50, and a vacuum pump 52.

  The trap tank 48 is connected to the suction port 36 via the pipe 40 and the valve 54, and temporarily stores the coating liquid 110 and the circulating solvent (waste liquid) sucked from the suction port 36 by the operation of the vacuum pump 52. . The trap tank 48 is connected to the waste liquid tank 50 via a pipe 55, a valve 56 and a pump 66, connected to the atmosphere via a pipe 58 and a valve 60, and connected to the vacuum pump 52 via a pipe 62 and a valve 64. ing.

  The waste liquid tank 50 stores the waste liquid in the trap tank 48 collected by the pump 66 through the pipe 55. In the present embodiment, the discharge means 130 is configured by the pipe 54, the valve 56, and the pump 66.

  The vacuum pump 52 generates a negative pressure in the trap tank 48 via a pipe 62 connected to the trap tank 48. Therefore, when the vacuum pump 52 is operated, the coating liquid 110 and the circulating solvent scraped by the scraping doctor blade 20 are sucked from the suction port 36 through the pipe 40 and collected into the trap tank 48. It is preferable that the pressure in the trap tank 48 is set to about 13.3 kPa to 80.0 kPa, for example, by the vacuum pump 52. In the present embodiment, the suction means 120 includes the suction port 36, the trap tank 48, the pipes 40 and 62, the valves 54 and 64, and the vacuum pump 52.

(Operation of pretreatment device for coating film forming apparatus)
Next, the operation of the pretreatment apparatus 10 for a coating film forming apparatus having the above configuration will be described.

  In the pretreatment device 10 for the coating film forming apparatus, after the coating liquid 110 is discharged from the coating liquid supply nozzle 100 to the priming roller 16, a certain time (for example, about 0.1 to 0.5 seconds) has elapsed. Then, the rotation of the priming roller 16 is started. When the rotation of the priming roller 16 is started, the vacuum pump 52 is operated in a state where the valves 54 and 64 are opened and the other valves are closed, and the priming roller 16 is moved from the circulating solvent supply nozzle 18 and the new solvent supply nozzle 24 onto the priming roller 16. Is supplied with the solvent. When the amount of projection of the coating liquid 110 from the coating liquid supply nozzle 100 is adjusted by the coating film forming apparatus pre-processing apparatus 10, the coating liquid supply nozzle 100 moves onto a coating target such as a substrate (not shown) to be coated. The coating liquid 110 is applied to the object.

  On the other hand, the coating liquid 110 discharged onto the priming roller 16 reaches the scraping doctor blade 20 in a state where the circulating solvent is supplied from the circulating solvent supply nozzle 18 as the priming roller 16 rotates. When the coating liquid 110 and the solvent are scraped from the priming roller 16 by the scraping doctor blade 20 and proceed on the scraping surface S, the coating liquid 110 and the solvent are trapped from the suction port 36 by the action of the vacuum pump 52. Suction into the tank 48.

  When the coating liquid 110 and the circulating solvent (waste liquid) sucked from the suction port 36 are temporarily stored in the trap tank 48, the valves 54 and 64 are closed. Subsequently, the valve 60 is opened, and the atmospheric pressure in the trap tank 48 is made equal to the atmospheric pressure. In this state, the valve 56 is opened and the pump 66 is operated, whereby the waste liquid temporarily stored in the trap tank 48 is collected in the waste liquid tank 50.

  Note that the coating liquid 110 that is not scraped off by the scraping doctor blade 20 and remains slightly on the priming roller 16 is removed from the priming roller 16 by the solvent supplied from the solvent tank 22 and the solvent supplied from the new solvent supply nozzle 24. Removed. Thereafter, liquid draining by the liquid draining doctor blade 26 and drying by the gas injection nozzle 28 for drying are performed, and the cleaning of the priming roller 16 is completed. In the pretreatment device 10 for a coating film forming apparatus, the above steps are repeated.

  Here, in the pretreatment apparatus 10 for a coating film forming apparatus according to the present embodiment, a test was performed to confirm that economic efficiency and maintainability can be improved. In the test, the black matrix resin, the red colored resin, the green colored resin, the blue colored resin, and the overcoat resin for the color filter are respectively subjected to the above-described pretreatment for the coating film forming apparatus from the coating liquid supply nozzle 100 of the coating film forming apparatus. It discharged to the priming roller 16 of the apparatus 10, and the protrusion amount from the coating liquid supply nozzle 100 was adjusted about each resin. Thereafter, a resin whose protrusion amount from the coating liquid supply nozzle 100 was adjusted was applied to various transparent substrates having a length and width of 370 mm × 470 mm and a thickness of 0.4 to 0.7 mm. At this time, the test was conducted under the conditions of the following examples and comparative examples using propylene glycol monomethyl ether acetate as a solvent in the pretreatment apparatus 10 for a coating film forming apparatus. A black matrix resin, a red colored resin, a green colored resin and a blue colored resin for color filters use acrylic photosensitive resins as the overcoat resins, and acrylic thermosetting resins as the overcoat resins. Various transparent substrates As this, alkali-free glass or soda lime glass was used.

(Example)
In the embodiment, each resin and propylene glycol monomethyl ether acetate scraped by the scraping doctor blade 20 are sucked by the suction means 120 so that the pressure in the trap tank 48 is about 13.3 to 80.0 kPa. The priming roller 16 was cleaned by setting the diameter of the priming roller 16 to 100 mm and the rotational speed of the priming roller 16 to 40 mm / sec.

(Comparative example)
The difference between the comparative example and the example is that the suction means 120 is not provided and each resin and propylene glycol monomethyl ether acetate scraped by the scraping doctor blade 20 are not sucked by the suction means 120. .

(Evaluation results)
About the Example and the comparative example, the coloring state of the propylene glycol monomethyl ether acetate in the solvent tank 22 when each said resin was discharged on the priming roller 16 1500 times was observed visually. As a result, in the examples, the amount of propylene glycol monomethyl ether acetate used per discharge of black matrix resin, red colored resin, green colored resin and blue colored resin was set to 13 ml, and overcoat resin discharge 1 The amount of propylene glycol monomethyl ether acetate used per round was set to 27 ml, but the propylene glycol monomethyl ether acetate in the solvent tank 22 was hardly colored. On the other hand, in the comparative example, the amount of propylene glycol monomethyl ether acetate used per discharge of the black matrix resin, red color resin, green color resin and blue color resin is set to 65 ml, and the overcoat resin is discharged once. The amount of propylene glycol monomethyl ether acetate used in the above was set to 90 ml, but the coloration of propylene glycol monomethyl ether acetate in the solvent tank 22 was remarkable. Therefore, increasing the degree of coloration of propylene glycol monomethyl ether acetate in the solvent tank 22 means that the concentration of the solute in the coating liquid 110 in the propylene glycol monomethyl ether acetate in the solvent tank 22 is increased. In such an example, it was confirmed that the concentration of the solute in the coating liquid 110 in the propylene glycol monomethyl ether acetate in the solvent tank 22 was maintained in a very low state. Moreover, in the Example which concerns on this invention, the usage-amount of propylene glycol monomethyl ether acetate was reducing significantly compared with the comparative example, and it was confirmed that economic efficiency is improving significantly.

  Moreover, about the Example and the comparative example, after discharging each said resin on the priming roller 16 1500 times, the state of the member around the scraping doctor blade 20 and the liquid cutting doctor blade 26 was confirmed visually. As a result, in the example, almost no adhesion of resin was observed on members around the scraping doctor blade 20 and the liquid draining doctor blade 26. On the other hand, in the comparative example, a large amount of resin adhered to members around the scraping doctor blade 20 and the liquid draining doctor blade 26. Therefore, in the Example which concerns on this invention, compared with a comparative example, resin hardly adheres around the member of the scraping doctor blade 20 and the liquid cutting doctor blade 26, and maintainability is remarkably improved. Was confirmed.

  As described above, in the present embodiment, the coating liquid 110 supplied with the solvent from the circulating solvent supply nozzle 18 is scraped off from the priming roller 16 by the scraping doctor blade 20. Then, the coating liquid 110 scraped by the scraping doctor blade 20 is sucked from the suction port 36 by the vacuum pump 52 together with the circulating solvent, and is collected in the waste liquid tank 50 through the trap tank 48. Therefore, the scraped coating liquid 110 and the circulating solvent hardly wrap around the scraping surface S of the scraping doctor blade 20 and are carried over to the solvent tank 22, and the coating liquid 110 in the solvent in the solvent tank 22 is eliminated. The concentration of the solute in it can be kept extremely low. As a result, the replenishment amount of a new solvent from the new solvent supply nozzle 24 can be extremely reduced, and the economic efficiency is remarkably improved. At the same time, since the solute in the coating liquid 110 that has been scraped is hardly solidified and adheres to members around the scraping doctor blade 20, the maintainability is remarkably improved.

  In the present embodiment, the scraping doctor blade 20 and the plate-like body 34 extend over the entire length of the priming roller 16, and the plate-like body 34 covers the scraping surface S of the scraping doctor blade 20. The suction port 36 is formed by being disposed. The waste liquid is sucked from the suction port 36 by the vacuum pump 52. Therefore, since the suction port 36 is integrated with the scraping doctor blade 20, the structure of the suction port 36 can be simplified, and the coating liquid 110 and the circulating solvent are scraped off by the scraping doctor blade 20, The coating liquid 110 and the circulating solvent thus scraped off can be sucked by the suction means 120 efficiently and reliably.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments. For example, although the coating liquid 110 scraped from the suction port 36 is sucked using the vacuum pump 52, other apparatuses can be used as long as the coating liquid 110 can be sucked together with the solvent. Specifically, instead of the vacuum pump 52, a factory local exhaust device, a blower, an ejector or the like may be connected to perform suction, and if these devices are used to divert the factory exhaust line, the economy is further improved. It is preferable because it can be used.

  Further, in the present embodiment, the suction port 36 is configured integrally with the scraping doctor blade 20, but the suction port 36 and the scraping doctor blade 20 may be separated.

  In addition, the liquid draining doctor blade 26 may be provided with a plate-like body 200 to form the suction port 210 as well as the scraping doctor blade 20, and the suction means 220 may be configured (see FIG. 1). In this case, the priming roller 16 can be drained more efficiently. Also at this time, the suction port and the liquid cutting doctor blade 26 may be separated.

  Further, as shown in FIGS. 4 and 5, the present invention may be applied to a coating film forming apparatus 300. Specifically, the coating film forming apparatus 300 is a gravure coater, for example, and includes a gravure coater main body 312 for applying the coating liquid 110 to the web W and a waste liquid processing unit 14. The gravure coater main body 312 includes a gravure roller 316 having a group of cells (not shown) formed on the surface, and the coating liquid in the order of rotation of the gravure roller 316 (direction of arrow B shown in FIG. 4). It has a tank 322, a coating doctor blade 326, and a scraping doctor blade 20.

  The gravure roller 316 has a substantially cylindrical outer shape, and is provided so as to be rotatable in the arrow B direction shown in FIG. 4 with respect to the gravure coater body 312. The coating liquid tank 322 is a container for storing the coating liquid 110. The coating liquid tank 322 has an opening 322a for receiving a part of the gravure roller 316 on its side surface. The upper end of the opening 322a is sealed by the surface of the gravure roller 316 and the application doctor blade 326, and the lower end of the opening 322a is sealed by the surface of the gravure roller 316 and the scraping doctor blade 20. Therefore, the coating liquid 110 is sealed inside the coating liquid tank 322, and the coating liquid 110 is supplied to the surface of the gravure roller 316 located inside the coating liquid tank 322.

  The application doctor blade 326 is for scraping off the excess application liquid 110 on the surface of the gravure roller 316. Therefore, an appropriate amount of the coating liquid 110 is applied to the web W. In addition, the web W is sent out in the direction (arrow C direction shown in FIG. 4) opposite to the rotation direction (arrow B direction shown in FIG. 4) of the gravure roller 316 at the contact portion with the gravure roller 316.

  The scraping doctor blade 20 can scrape the remaining coating liquid 110a remaining on the surface of the gravure roller 316 after the coating liquid 110 is applied to the web W. A plate-like body 34 is provided above the scraping doctor blade 20 so as to cover the surface (scraping surface) S of the scraping doctor blade 20 on the side where the remaining coating liquid 110a is scraped. The scraping doctor blade 20 and the plate-like body 34 form a slit-like suction port 36 for sucking the remaining coating liquid 110a by the vacuum pump 52. The suction port 36 is connected to the trap tank 48 via the pipe 40 (see FIG. 5).

  In the coating film forming apparatus 300 having the above configuration, the remaining coating liquid 110a is scraped off from the gravure roller 316 by the scraping doctor blade 20. Then, the remaining coating liquid 110 a scraped by the scraping doctor blade 20 is sucked from the suction port 36 by the vacuum pump 52 and collected in the waste liquid tank 50 through the trap tank 48. For this reason, the scraped remaining coating liquid 110a hardly wraps around the scraping surface S of the scraping doctor blade 20 and is carried over to the coating liquid tank 322. At the same time, since the solute in the remaining coating liquid 110a thus scraped off is hardly solidified and hardly adheres to members around the scraping doctor blade 20, the maintainability is remarkably improved.

It is the schematic which shows the whole structure of the pre-processing apparatus for coating film forming apparatuses which concerns on this embodiment. It is a figure which expands and shows the scraping doctor blade part of the pre-processing apparatus for coating film forming apparatuses which concerns on this embodiment. It is a figure which shows the various cross-sectional shapes of the front-end | tip of a doctor blade. It is the schematic which shows the whole structure of a coating film forming apparatus. It is a figure which expands and shows the scraping doctor blade part of a coating film forming apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Pre-processing apparatus for coating film forming apparatuses, 12 ... Pre-processing apparatus main body, 14 ... Waste liquid processing part, 16 ... Priming roller, 18 ... Circulating solvent supply nozzle (solvent supply means), 20 ... Scraping doctor blade, 34 ... Plate-like body 36 ... Suction port 48 ... Trap tank (temporary storage means) 52 ... Vacuum pump 100 ... Coating liquid supply nozzle 110 ... Coating liquid 110a ... Remaining coating liquid 120 ... Suction means 130 ... Discharge Means: 300 ... coating film forming apparatus, 312 ... gravure coater body, 316 ... gravure roller, 322 ... coating liquid tank, W ... web.

Claims (8)

A priming roller for discharging the coating liquid from the coating liquid supply nozzle of the coating film forming apparatus;
Solvent supply means for supplying a solvent to the coating liquid discharged on the priming roller;
A doctor blade that contacts the priming roller and scrapes off the coating liquid and solvent on the priming roller;
A pretreatment apparatus for a coating film forming apparatus, comprising: a suction unit that sucks a coating liquid and a solvent scraped by the doctor blade.   The suction means includes a plate extending over the entire length of the priming roller so as to cover the doctor blade extending over the entire length of the priming roller and the surface of the doctor blade on the side where the coating liquid is scraped off. The pretreatment device for a coating film forming apparatus according to claim 1, wherein the pretreatment device has a suction port formed by a shape body. The suction means has a temporary storage means for temporarily storing the sucked coating liquid and solvent,
The pretreatment device for a coating film forming apparatus according to claim 1 or 2, further comprising a discharge means for discharging the coating liquid and the solvent temporarily stored in the temporary storage means. apparatus. A discharge step of discharging the coating liquid from the coating liquid supply nozzle of the coating film forming apparatus to the priming roller;
A solvent supply step of supplying a solvent to the coating liquid discharged on the priming roller;
A pretreatment for a coating film forming apparatus, comprising: removing a coating liquid and a solvent on the priming roller by a doctor blade in contact with the priming roller; and removing the coating liquid and the solvent scraped by the doctor blade. Method. A gravure roller to which a coating solution is supplied;
A doctor blade in contact with the gravure roller and scraping off the coating liquid on the gravure roller;
A coating film forming apparatus comprising: suction means for sucking the coating liquid scraped off by the doctor blade.   The suction means is a plate extending over the entire length of the gravure roller so as to cover the doctor blade extending over the entire length of the gravure roller and the surface of the doctor blade on the side where the coating liquid is scraped off. The coating film forming apparatus according to claim 5, wherein the coating film forming apparatus has a suction port formed by the shaped body. The suction means has a temporary storage means for temporarily storing the sucked coating liquid,
The said coating film forming apparatus is a coating film forming apparatus described in Claim 5 or 6 further provided with the discharge means which discharges | emits the coating liquid temporarily stored by the said temporary storage means. A coating liquid supply process for supplying the coating liquid to the gravure roller;
A coating film forming method comprising: removing the coating liquid on the gravure roller with a doctor blade in contact with the gravure roller, and removing the coating liquid scraped off by the doctor blade.

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