JP2006224093A - Forced fine vibration coating apparatus and coating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high precision coating apparatus free from coating defects by solving a problem occurring in the coating operation of applying a liquid material (hereafter called a coating liquid) on a base material to be coated (hereafter called a web) to obtain an excellent coating surface. <P>SOLUTION: In the coating apparatus and a coating method, vibration wave propagated through a groove made on a solid device constituting the coating apparatus is led to the end part of the solid device to finely vibrate the end part and the coating liquid is vibrated in the interface formed by the coating liquid with the end part of the solid device in the coating process. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a coating apparatus, and various liquid substances (hereinafter referred to as “web”) on a sheet-like or web-like coated substrate (hereinafter referred to as “web”) such as a metal plate, paper, plastic film, glass, fiber, rubber, and wood. The present invention relates to a coating apparatus and a coating method.

As coating devices for applying various liquid coatings to webs such as metal plates, paper, plastic films, glass, fibers, rubber, etc., roll coaters, knife coaters, gravure coaters, air knife coaters, die coaters, curtain coaters, Various apparatuses such as a slide coater, an extrusion coater, a rod coater, and a blade coater are known (see, for example, Non-Patent Document 1).
"Convertech" July 2004, page 36

These coating devices are used for the purpose of coating a web with a coating solution having an optimum coating amount of the desired product quality. In the process of coating the coating solution on the web, rolls, slits, knives, blades, etc. The coating device is a solid device that constitutes the coating device, and the coating solution is transferred, measured, and smoothed and transferred to the web. The mechanical design and manufacturing accuracy of the coating device, the composition of the coating solution in the product design, the liquid properties and the web The amount of web application varies depending on the properties and quality variations of the product, but in recent years, the demand for quality has increased and various measures have been taken to increase the accuracy of further application amounts ( For example, see Patent Document 1).
Japanese Patent Laid-Open No. 2001-191016 (page 8, FIG. 1)

However, in the past, we have pursued to improve the mechanical manufacturing accuracy of the coating device and reduce the vibration of the device in order to increase the coating accuracy, but the runout accuracy is only on the order of several μm, and it is not possible to obtain a highly accurate coating film thickness. It is extremely difficult and the coating apparatus becomes more complicated and costs increase, so there is a technical limit naturally.

Furthermore, in a coating apparatus or a coating method that presses a solid member against a moving object, such as the above-described gravure coater, rod coater, blade coater, etc., the solid member of the apparatus is worn and deformed due to the operation of the coating apparatus. There is a problem in that the pressure distribution becomes uniform and the coating amount fluctuates and the coating becomes uneven, and further, the wear of the solid material is mixed into the coating liquid.

In recent years, it has become necessary to apply various unstable liquids that are prone to separation, sedimentation, and agglomeration in order to deal with products that require a variety of advanced functions. There is a device that has been subjected to an apparatus or method for applying to a web after shaking (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 2001-88459 (5th page, FIG. 3)

However, in the above-mentioned measures, the coating liquid deteriorates due to viscous resistance at the interface with the solid apparatus constituting the coating apparatus that comes into contact with the coating liquid generated in the coating process, and forms a boundary layer to separate or settle the coating liquid components and stagnation. Or stays or adheres to the solid wall, causing a quality failure and failing to obtain good product quality.

Furthermore, in the coating process, the coating liquid comes into contact with surrounding gas components such as air when moving from the solid device constituting the coating apparatus onto the web, so that the coating liquid medium easily evaporates at the interface contacting the solid and the gas. The coating process, such as solidifying and adhering to the coating device or locally drying, causes streaks and coating unevenness on the coating surface, mixed as foreign matter or bubbles, causing quality failure and stalling operation. (See, for example, Patent Document 3 and Non-Patent Document 2).
JP 2001-104851 page 1 "Convertech" November 2004, page 51

Furthermore, in order to solve various problems in the coating process, various inventions that apply ultrasonic vibration have been made, and by adding ultrasonic vibration to the coating apparatus and adding ultrasonic vibration, the fluidity of the coating liquid Attempts have been made to improve

For example, in a knife coater, a device has been devised in which an ultrasonic piezoelectric element is provided on the back of the knife to prevent residual droplets on the knife.
JP-A-7-299408

Furthermore, the device which prevents generation | occurrence | production of a streak failure by adding an ultrasonic vibration to the extrusion type | mold coater which has a slit structure is performed.
JP-A-9-141171

Furthermore, in a die type coater having a slit structure, a device has been devised in which an ultrasonic piezoelectric element is directly provided on the die to improve the fluidity of the coating liquid and prevent the generation of solids and gels.
JP 2000-237664 A JP 2002-79162 A JP 2003-260399 A

Furthermore, a device has been devised to prevent contamination by applying ultrasonic vibration to a doctor blade used in a gravure coater such as a printing machine, to reduce wear of the doctor blade, and to improve cleaning work.
JP-A-11-58700 JP 2000-85094 A

As seen in the above-mentioned patent document, it is effective to improve the flow of the coating liquid, especially applying ultrasonic vibration to the coating apparatus, but the characteristic of ultrasonic vibration is the intensity of periodic waves, that is, the abdomen and the nodal part. It is generated and the strength of the flow of the coating liquid at the interface with the solid is increased and warped, and the problem in the coating process is increased.

Further, there may be a case where the solid state device in which ultrasonic vibration propagates does not vibrate at all, or further, local vibration is increased and the problem in the coating process is increased.

In addition, ultrasonic vibration propagates through a solid device in three dimensions, such as longitudinal waves, transverse waves, and surface waves, and also generates waves that are reflected and interfered with each other. In order to propagate well, it is important to direct ultrasonic vibrations in the correct direction to reduce the generation of the abdomen and nodes and obtain a leveled wave.

The present invention solves coating process problems such as separation, deposition, solidification, drying, and wear of solid equipment due to partial stagnation or stagnation of coating liquid in coating apparatuses that apply various coating liquids to the web. In order to achieve this, various devices and methods for applying vibrations to the coating apparatus have been invented, and in particular, there have been inventions that use ultrasonic waves as a vibration source. Propagation of the abdominal part and the nodal part of the wave appears remarkably by propagating in the third dimension such as surface waves.

Accordingly, the intensity of the vibration of the coating liquid is generated at the interface contacting the end of the solid apparatus corresponding to the wave generated in the solid apparatus, and the corresponding strength of the movement of the coating liquid is emphasized, thereby forming coating unevenness and the coating apparatus. Problems such as non-uniform contact between the solid devices occur, and the object of solving various problems in the coating process by vibrating the coating device cannot be achieved.

The present invention solves coating process problems such as separation, deposition, solidification, drying, and wear of solid equipment due to partial stagnation or stagnation of coating liquid in coating apparatuses that apply various coating liquids to the web. Therefore, in the apparatus and method for applying vibration to the coating apparatus and solving the problem, it has a mechanism in which the vibration is effectively and uniformly propagated to a predetermined apparatus part, and particularly the abdominal part and the nodal part which are characteristics of ultrasonic vibration. Coating apparatus and coating method for solving various problems in the coating process by reducing the generation and leveling, efficiently propagating the vibration to the predetermined end of the solid-state device, and vibrating the formed interface uniformly and effectively Is to provide.

The gist of the present invention described in claim 1 is that the flow of the coating liquid in the vicinity of the solid-liquid interface, that is, in the vicinity of the solid wall surface, in contact with the coating liquid that is guided and transferred to the solid-state device constituting the coating apparatus forms a boundary layer and is stagnant. Therefore, it has a mechanism that forcibly vibrates the solid device and directs the direction of the vibration in accordance with the gist of the present invention to reduce and level the generation of the abdomen and nodes of the vibration wave. Uniform and fine vibration motion occurs, the boundary layer decreases or disappears, the flow of the coating liquid at the solid-liquid interface is promoted, and the fine vibration motion is caused at the solid-liquid interface.

The gist of the present invention described in claim 2 is that the coating liquid guided and transferred to the solid-state device constituting the coating apparatus is in contact with air to form a gas-liquid interface. In accordance with the gist of the invention, it has a mechanism that directs the direction of vibration to reduce and level the generation of vibration waves, and the vibration propagated by the vibration motion of the solid state device is uniform and fine in the coating liquid at the gas-liquid interface It has a function of renewing without causing stagnation of the interface of the coating liquid by causing an oscillating motion.

The gist of the present invention as set forth in claim 3 has a mechanism that forcibly vibrates the coating apparatus and directs the direction of the vibration in accordance with the gist of the present invention to reduce the occurrence of vibration wave strength and level, In the process of transferring the coating liquid guided to the solid device that constitutes the apparatus to the web, the coating liquid leaving the solid apparatus propagated at the boundary forming the solid-gas-liquid interface contacting the solid and the gas. It has a function of causing uniform and fine vibration motion in the coating liquid by vibration to renew the interface of the coating liquid.

The gist of the present invention described in claim 4 is that a vibration wave propagates at the tip of the solid device where the coating liquid is guided to the solid device constituting the coating device by applying a forced vibration to the coating device and the coating liquid moves to the web. It has a mechanism that directs the direction according to the gist of the present invention to reduce and level the generation of vibration waves, and is positioned on the coating liquid and the web positioned between the tip of the solid device where the vibration waves propagate and the web. The coating liquid has a function of generating a uniform and fine vibration motion to promote the flow of the coating liquid.

The gist of the present invention described in claim 5 is that the ultrasonic wave is used as means for applying a forced vibration to the coating device, and the solid device that constitutes the coating device includes longitudinal waves, transverse waves, surface waves, and the like according to the gist of the present invention. It has the function of promoting uniform flow by directing the ultrasonic vibration that is achieved in three dimensions and developing fine vibration motion of the coating liquid at the interface with the solid or gas formed by the coating liquid in the coating process. It is characterized by.

The gist of the present invention described in claim 6 is that the solid device is grooved in a direction in which ultrasonic vibration is propagated in the process of propagating the ultrasonic wave to the solid device constituting the coating apparatus, and ultrasonic waves are transmitted in accordance with the gist of the present invention. It is characterized in that it has a function of promoting a uniform flow of the coating liquid by developing a fine vibration motion at the interface with the solid or gas formed by the coating liquid in the coating process at the end of the solid device.

The gist of the present invention described in claim 7 is that the solid device is cut out in a direction in which the ultrasonic vibration is propagated in the process of propagating the ultrasonic vibration to the solid device constituting the coating apparatus, and the ultrasonic wave is produced. It is characterized in that it has a function of promoting a uniform flow of the coating liquid by expressing a fine vibration motion at the interface with the solid or gas formed by the coating liquid in the coating process at the end of the solid device.

The gist of the present invention described in claim 8 is that the solid device is cut and processed in the direction in which the ultrasonic vibration is propagated in the process of propagating the ultrasonic vibration to the solid device constituting the coating apparatus. It has a function of directing sonic vibration and developing a fine vibration motion at the interface with the solid or gas formed by the coating liquid in the coating process at the end of the solid device and promoting uniform flow of the coating liquid. .

The gist of the present invention described in claim 9 is that the solid device is drilled in the direction in which the ultrasonic vibration is propagated in the process of propagating the ultrasonic vibration to the solid device constituting the coating apparatus, and ultrasonic waves are formed. It has a function of directing vibration and developing a fine vibration motion at the interface with the solid or gas formed by the coating liquid in the coating process at the end of the solid device to promote uniform flow of the coating liquid.

The gist of the present invention described in claim 10 is that, in the process of propagating ultrasonic vibration to the solid device constituting the coating apparatus, the solid device is grooved or cut out in the direction of propagating ultrasonic vibration according to the gist of the present invention. In combination with notching and drilling, ultrasonic waves are directed to the end of the solid device, and the coating liquid forms a fine vibration motion at the interface with the solid or gas that forms in the coating process. It has a function of promoting the above.

Various coating devices have been proposed to apply coating liquids of various products to the web as described above. In particular, by applying ultrasonic vibration, the coating device is vibrated to promote the flow of the coating liquid and to partially apply the coating liquid. Attempts have been made to solve the problem in the coating process due to generation of solid matter due to stagnation, but as a characteristic of ultrasonic vibration, the coating liquid of the node is applied at the interface where the abdomen and node of the vibration waveform are generated and contacted. Since the flow stays and uniform coating cannot be achieved, according to the present invention, directivity is given to the vibration of the solid device constituting the coating device to reduce the reflection and interference of vibration waves, especially the abdomen and nodes of ultrasonic vibration. Uniform vibrations can be generated at the end of the solid device, and problems associated with stagnation of the partial flow of the coating liquid during the coating process can be solved.

Furthermore, according to the present invention, the solid device constituting the coating apparatus propagates vibrations to the interface formed with the coating liquid, and in particular, the ultrasonic wave is generated by three-dimensional vibration waves such as longitudinal waves, transverse waves, and surface waves. In addition, it reduces the occurrence of vibrations and joints, and eliminates the reflection and interference of vibration waves, effectively directing them toward the interface of the solid state device and causing the coating liquid to form fine vibration motions at the interface. Prevents the coating liquid from becoming uneven at the interface, such as separation, stagnation, adhesion, solidification, generation of bubbles, and coalescence of the coating liquid. The operation of the mechanical device can be improved by reducing the coating surface failure such as adhesion and mixing, and coating unevenness, and the monitoring work and cleaning work accompanying such problems.

Furthermore, in the coating process, the coating liquid interface expresses a fine vibration motion and directs and propagates the vibration to the target liquid interface to give an appropriate shear rate, thereby changing the flow characteristics of the coating liquid and changing the coating proper range. Furthermore, it contributes to the leveling effect on the surface of the coating liquid, and the coated surface can be flattened.

Furthermore, by causing the vibration to be directed and propagated to the end of the solid device that constitutes the coating apparatus that contacts the coating liquid transferred onto the web, and to develop a fine vibration motion that is leveled, the coating liquid is spread on the surface of the web. In particular, when the webs can be joined closely, and the web has a rough surface, the effect is more effective.

Furthermore, the vibration according to the present invention can be achieved by appropriately selecting the frequency of the ultrasonic wave and the apparatus, and the restrictions on the application apparatus such as the quality accuracy of the web in the coating process, the properties of the coating liquid, the product quality, the coating apparatus and the coating amount accuracy. Therefore, the frequency, amplitude and strength at the interface of the coating liquid with which the solid state device constituting the coating apparatus comes into contact can be optimally selected, and the application range of the coating apparatus can be widened.

Furthermore, the solid device that is in contact with the moving roller or rotating bar in the solid device constituting the coating device, for example, in the doctor or bar support mechanism, the vibration is directed to the solid device and uniformly vibrated. As a result, the frictional resistance between the solid devices in contact with each other is reduced, so that partial wear and deformation of the member, and adhesion and solidification of the coating liquid in contact with it can be eliminated, and the replacement cycle of the member can be extended. It is possible to eliminate quality troubles such as mixing and solidification of coating liquid.

In the present invention, an appropriate vibration is forcibly applied to the coating device, and the vibration wave is directed to the end of the solid device constituting the predetermined coating device so that the coating liquid formed in the coating process is in contact with the solid device end. A fine vibration motion is leveled and propagated in a gas-liquid interface formed by a gas such as air in the solid-liquid interface or in the surrounding environment, and further a coating liquid at the solid-gas-liquid interface to promote flow at the interface.

Furthermore, ultrasonic waves are preferable as a means for imparting a fine vibration motion to the coating liquid at the interface of the solid apparatus end contacting the coating liquid and constituting the solid apparatus, and required coating quality, coating amount, coating accuracy, and web Depending on the accuracy of the properties and thickness, as well as the coating device and method, the coating speed, the physical properties and properties of the coating liquid, the stability and uniformity of the coating liquid, etc. The frequency of Mhz or Ghz, which is a high frequency range of ultrasonic waves, can be selected widely, but a frequency of 10 Khz to 100 Khz is preferable.

Furthermore, if the vibration displacement at the end of the solid device contacting the coating liquid interface propagating and propagating ultrasonic vibrations is too large, the coating liquid interface is disturbed and the vibration displacement must be within 30 μm to obtain fine movement of the coating liquid at the interface. In order to obtain fine movement at the coating liquid interface, fine vibration within 2 μm is preferable, and fine vibration within 0.1 μm is more preferable.

Furthermore, since the ultrasonic vibration propagates three-dimensionally, such as a longitudinal wave, a transverse wave, and a surface wave, while forming the abdomen and the node in the solid device, the generation of the abdomen and the node of the ultrasonic vibration is reduced and directed and propagated. Therefore, the propagating wave can be accurately directed and propagated to the end of the solid device by processing the solid device by the mechanism of the present invention and leveling the ultrasonic vibration.

Furthermore, in order to direct the ultrasonic vibration in the direction in which the solid-state device is desired to propagate, the solid-state device is subjected to grooving along the traveling direction so as to restrict the spread of the longitudinal wave, the transverse wave, and the surface wave of the vibration wave. Therefore, it is possible to divide the diffusion of the wave, reduce the generation of the abdomen and node of the ultrasonic vibration, level it, give the direction of propagation, and propagate to the predetermined end of the solid device.

Further, in order to direct the ultrasonic vibration in a direction in which the ultrasonic vibration is desired to propagate in the solid-state device, the members constituting the solid-state device are cut out along the traveling direction so as to regulate the spread of the longitudinal wave, the transverse wave, and the surface wave of the vibration wave. It can be processed to divide the diffusion of the wave, reduce the generation of the abdomen and nodes of the ultrasonic vibration, level it, give the direction of propagation, and propagate to the predetermined end of the solid device.

Furthermore, in order to direct the ultrasonic vibration in the direction in which it is desired to propagate in the solid-state device, the solid-state device is partially notched along the traveling direction so as to restrict the spread of the longitudinal wave, the transverse wave, and the surface wave of the vibration wave. It is possible to cut the wave propagation around the solid of the vibration wave by processing to reduce the generation of the abdomen and nodes of the ultrasonic vibration and level it to give the direction of propagation and propagate it to the end of the solid device I can do it.

Furthermore, in order to direct the ultrasonic vibration in the direction in which it is desired to propagate in the solid-state device, partial drilling is performed in the solid-state device along the traveling direction so as to restrict the spread of the longitudinal wave, the transverse wave and the surface wave of the vibration wave. The wave propagation around the solid of the vibration wave is divided to reduce the generation of the abdominal part and the node part of the ultrasonic vibration to give the propagation direction and propagate to the predetermined end of the solid device.
It is effective to arrange a plurality of the hole drills, and the holes may be penetrated or fixed in the middle of the solid-state device, and odd-shaped holes may be combined.

Further, in order to direct the ultrasonic vibration in the direction in which the ultrasonic vibration is desired to propagate in the solid-state device, groove processing, cut-out processing, or the like is performed according to the shape of the solid-state device so as to regulate the spread of the longitudinal wave, the transverse wave, and the surface wave of the vibration wave. Combines shape processing such as notch processing and hole processing, reduces the occurrence of ultrasonic vibration abdomen and nodes, leveles them, and gives a favorable direction to the vibration wave propagating through the solid device. Can be propagated to.

Furthermore, not only shape processing such as grooving, cutting, notching and hole processing described above, but also the solid device is projected by a method such as cutting processing, welding processing or fitting processing. It is also possible to level the wave by processing it into a part and directing it in the direction in which the ultrasonic vibration is desired to propagate.

Furthermore, a single or a plurality of vibrators may be installed in the solid-state device. In particular, in the case of ultrasonic vibration, it is possible to reduce the amplitude of the vibration wave by installing a plurality of vibration elements. This is effective for the solid device, and it is preferable to install a plurality of ultrasonic elements at the nodes of the waves generated by the ultrasonic vibration for leveling the ultrasonic vibration.

Furthermore, the plurality of vibrators installed in the solid-state device can be further reduced in amplitude by combining the vibrators to have odd and even frequencies, particularly in the case of ultrasonic vibration. It is preferable to obtain a wave.

Further, there is no restriction on the portion where the vibration device is attached to the solid device of the coating device as long as the ultrasonic vibration is accurately generated at the end of the solid device, but particularly when the ultrasonic vibration device is used as a vibration source. More preferably, the ultrasonic vibration is installed vertically with the traveling direction as an axis.

An example of an embodiment of the present invention will be described below with reference to FIGS. 1 to 4, but the coating apparatus and the coating method according to the present invention are not limited to this example.

The coating liquid 1 typified by a die coater as shown in FIG. 1 is blocked from the air around the coating apparatus and passes through a closed flow path 3 formed in a solid apparatus 2 constituting the die coater. In the coating apparatus that moves to the web 8 supported by the backup roll 7 while leaving the die tips 4 a and 4 b of the apparatus 2 and contacting the air 6 a and 6 b, the coating liquid 1 is the wall surface of the sealed flow path 3 inside the solid apparatus 2. 5a and 5b flow to form a solid-liquid interface, that is, a solid-liquid interface, and a boundary layer is formed in the vicinity of the wall surface by viscous resistance, and the flow of the coating liquid 1 is poorly applied on the wall surface 5a and 5b of the sealed flow path 3. The liquid is no longer renewed and stagnation or stays on the wall surface, and the contents are separated or deposited, adhere to the wall surface, become a non-uniform coating liquid, and are applied to the web 8, causing problems in product quality.

According to the present invention, an ultrasonic oscillator 11 is driven by an ultrasonic oscillator 10 in FIG. 1 and is connected perpendicularly to a vertical axis direction that is focused by an ultrasonic horn 12 and propagates a vibration wave of a solid device 2 of a die coater. The ultrasonic vibration is propagated to the solid device 2 of the coating apparatus via the ultrasonic propagation tool 13, and the ultrasonic vibration is directed and leveled by the groove processing 23 a and 23 b of the solid device 2 to propagate as a sealed wave. 3, the vibration waves reach the solid wall surfaces 5a and 5b, generate a fine vibration motion in the coating liquid at the solid-liquid interface in contact with the coating liquid 1, reduce the boundary layer on the wall surface, increase the renewal of the coating liquid, The contents were not separated and deposited due to retention, and a uniform coating solution was maintained and a suitable coating could be applied to the web.

Further, as shown in FIG. 1, the coating liquid 1 moves away from the die tips 4a and 4b, which are solid devices 2, and moves to the web 8 supported by the backup roll 7. At the die tips 4a and 4b, the coating liquid is the ambient air. 6a and 6b come into contact with each other to form a solid-gas-liquid interface, and the coating liquid stagnates due to viscosity at the die tips 4a and 4b, and the solvent of the coating liquid easily evaporates by touching the air 6a and 6b. Adhesion and deposition on the die tips 4a and 4b are easy, and the die tips 4a and 4b are not uniform where the dirt coating solution separates from the die tips 4a and 4b, causing quality defects such as coating stripes and uneven coating. Therefore, the preferred ultrasonic wave forcibly applied from the ultrasonic apparatus shown in FIG. 1 according to the present invention propagates to the die tips 4a and 4b of the solid apparatus 2 to generate a fine vibration motion at the solid-gas-liquid interface. Tip 4a Since the coating liquid of b continuously moves finely, the viscosity at the solid-gas-liquid interface is lowered, and the fine movement of the coating liquid becomes active, and the interface of the coating liquid away from the die tips 4a and 4b is constantly renewed. 4b was able to maintain uniform conditions without becoming dirty, and good coating without coating streaks and coating unevenness was obtained.

Furthermore, according to the present invention, the coating liquid 14 positioned between the die tips 4a and 4b of the solid state device 2 which is a die coater and the web 8 supported by the backup roll 7 is transferred from the die tips 4a and 4b. The ultrasonic vibration directed by the grooving 23a and 23b propagates, the wave is leveled, and a fine vibration motion is generated, and the coating liquid is finely flowed on the web 8, resulting in a leveling effect and a uniform coating liquid layer. In addition, the coating liquid is pressed against the web 8 by directed ultrasonic vibration, and the coating liquid easily penetrates into the surface of the web having a particularly uneven surface, thereby obtaining a suitable adhesive effect.

In a typical gravure coater apparatus of a coating method in which a coating liquid is transferred to a web by a solid apparatus such as a rotating roller or a rod shown in FIG. 2, the coating liquid stored in the coating liquid pan 15 is shown as an embodiment according to the present invention. 1 is pumped up by the rotation of the gravure roller 16, the excess coating solution is scraped off by the doctor blade 17, and the ultrasonic oscillator is applied by the coating device in which the coating solution 1 is filled in the cell 18 engraved on the gravure roller 16 and transferred to the web 8. The ultrasonic transducer 11 is driven by 10 and focused by the ultrasonic horn 12, and the ultrasonic propagation tool 13 is connected to the doctor blade holders 24 a and 24 b, which are partially cut out 23 c, to propagate the ultrasonic vibration and the doctor blade 17. The doctor blade 17 is directed and propagated so that the wave leveled in the width direction of the doctor blade 17 proceeds toward the blade edge of the doctor blade. The vibration is propagated to the coating liquid in contact with the blade edge of the raid 17, and further the vibration is propagated to the coating liquid of the cell 18, whereby the coating liquid filled in the cell 18 is agitated to eliminate deposition and the web. 8 and the blade tip of the doctor blade 17 vibrates finely to 0.1 μm or less, so that a lubrication vibration motion is constantly generated between the gravure rolls 16 via the coating liquid. The resistance at the cutting edge of the blade 17 was reduced, and a uniform doctor action was obtained, and the effect that the wear of the doctor blade 17 was reduced and the replacement period was extended was recognized.
Furthermore, a fine vibration motion of the coating liquid occurs at the gas-liquid interface formed at the boundary with the air 6a and 6b, which is the gas around the doctor blade 17, and the surface of the coating liquid at the gas-liquid interface is constantly finely vibrated. By exercising, the coating liquid constantly flows without stagnation on the surface of the doctor blade 17, the solidification of the coating liquid components to the doctor blade 17 can be prevented, the generation of foreign matters can be prevented, and the cleaning can be performed. Easy to achieve.

FIG. 3 shows another embodiment of the present invention, and an ultrasonic oscillator 10 is used in a typical knife coater of a coating method in which the function of measuring the coating amount of the coating liquid is temporarily determined at intervals set between the coating liquid and the web. The ultrasonic wave is applied to the coating knife 19, which is partly cut out 23 d to drive the ultrasonic vibration through the ultrasonic wave propagation tool 13 that drives the ultrasonic transducer 11 and is connected in the longitudinal direction of the coating knife 19. By propagating vibrations, the coating liquid 1 is held in the coating liquid reservoir formed by the coating knife 19 and the liquid reservoir plate 20 and is in contact with the back surface 21 of the coating knife 19, that is, the solid-liquid interface, and further Can uniformly propagate the vibration motion induced to the coating knife back surface 21 and the coating knife tip 22 by the cutting process 23d to the solid-gas-liquid interface in contact with the air 6a and 6b. Structure The flow of the coating liquid 1 is promoted to eliminate local stagnation, stagnation, adhesion and solidification, and a uniform coating liquid is maintained. Further, the coating liquid layer 9 on the web 8 from the coating knife tip 22 is maintained. It was possible to generate uniform vibration by generating fine vibration motion and promoting the dispersion of the coating liquid on the web, homogenizing the components, and improving the defoaming and fluidity of the coating liquid and providing a leveling action. .

FIG. 4 shows another embodiment of the present invention. A coating liquid 1 represented by a curtain coater or the like passes through a closed flow path 3 formed in a solid device 2 that is blocked from the air around the coating apparatus and constitutes the curtain coater. In the coating apparatus in which the coating liquid 1 is transferred to a web 8 that is separated from the die tips 4a and 4b of the solid apparatus 2 to form a curtain 25 and is supported by a backup roll 7 while being in contact with air, the ultrasonic oscillator The ultrasonic transducer 11 is driven by 10 and focused on the ultrasonic horn 12 and opened in the solid device 2 through the ultrasonic wave propagation tool 13 connected to the solid device 2 in the vertical direction which is the vertical direction of the curtain 25. The ultrasonic vibrations are leveled by the horizontal holes 23e, 23f, 23g and the hole 23h, and propagated toward the die tips 4a, 4b to be transmitted to the inner wall surfaces 5a, 5b and die tips 4a, 4 of the solid-state device 2. The uniform and finely leveled ultrasonic vibration is propagated to reduce or eliminate the boundary layer on the inner wall surfaces 5a and 5b, thereby making the flow of the coating liquid uniform and eliminating the separation and deposition of the coating liquid due to stagnation and retention. In addition, the coating liquid generated at the die tips 4a and 4b is generated by propagating uniform fine vibrations to the solid-gas-liquid interface formed by the die tips 4a and 4b and continuously performing the renewal movement of the interface. To prevent adhesion and precipitation of the die, to prevent contamination of the die tips 4a and 4b, to eliminate the cause of quality failure such as coating stripes and uneven coating, and to maintain good operating conditions for a long time without contamination of the tips 4a and 4b. A good coating was obtained.

It is a schematic sectional drawing which shows the structure of an example of this invention apparatus. It is a schematic sectional drawing which shows the structure of another example of this invention apparatus. It is a schematic sectional drawing which shows the structure of another example of this invention apparatus. It is a schematic sectional drawing which shows the structure of another example of this invention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coating liquid 2 Solid apparatus 6a * 6b Air 7 Backup roll 8 Web 9 Application layer 10 Ultrasonic transmitter 11 Ultrasonic vibrator 12 Ultrasonic cone 13 Ultrasonic propagation tool 17 Doctor blade 19 Coating knife 23a / 23b Groove processing 23c Cutout 23d Cutout 23e ・ 23f ・ 23g ・ 23h Drilling

Claims (10)

An interface (hereinafter referred to as a solid-liquid interface) between a solid apparatus and a coating liquid that constitutes the coating apparatus by forcibly vibrating a coating apparatus that applies a liquid substance (hereinafter referred to as a coating liquid) to a substrate to be coated (hereinafter referred to as a web). A coating apparatus having a mechanism for directing vibration propagating through the solid apparatus and causing a fine vibration motion at the solid-liquid interface. The coating device is forced to vibrate and propagates through the solid device so that the coating liquid guided to the solid device that makes up the coating device makes fine vibration motions at the interface that contacts the air (hereinafter referred to as the gas-liquid interface). A coating apparatus having a mechanism for directing vibration to be applied. In the claims described in claims 1 and 2, the coating device is forced to vibrate, the solid device of the coating device induces the coating solution, and the coating solution moves to the air in the process of moving to the next step. It has a mechanism for directing vibration propagating through a solid device so that a solid-liquid-gas interface (hereinafter referred to as a solid-gas-liquid interface) is formed in contact with the coating liquid and the coating liquid makes a fine vibration motion at the interface. Coating device. 4. The solid film according to claim 1, wherein the coating device is forcibly vibrated so that the coating liquid separated from the solid device constituting the coating device and moving to the web performs fine vibration motion on the web. A coating apparatus having a mechanism for directing vibration propagating through the apparatus. 5. The method according to claim 1, wherein an ultrasonic wave is used as a method for forcibly vibrating the coating apparatus, and the ultrasonic vibration is effectively directed in a process in which the ultrasonic wave propagates through the solid device. A coating apparatus having a mechanism for obtaining a vibration motion at the interface of the coating. 6. A coating apparatus according to claim 1, wherein said coating apparatus has a grooved structure as a mechanism for directing vibration propagating through said solid device. 6. A coating apparatus according to claim 1, wherein said coating apparatus has a cut-out structure as a mechanism for directing vibration propagating through said solid device. 6. A coating apparatus according to claim 1, wherein the coating apparatus has a notched structure as a mechanism for directing vibration propagating through the solid-state device. 6. A coating apparatus according to claim 1, wherein said coating apparatus has a hole-formed structure as a mechanism for directing vibration propagating through said solid device. 6. The coating apparatus according to claim 1, wherein the coating device has a structure in which groove processing, cut-out processing, notch processing, hole processing, or the like is combined as a mechanism for directing vibration propagating through the solid-state device.

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