JP2002320892A - Method of manufacturing planer coated material and coating device adequate for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method which is capable of forms to a nearly uniform thickness and simultaneously coating both surfaces and is high in a coating speed and excellent in productivity and a device for the same. SOLUTION: The planar material 1 to be coated is so clamped that its surfaces to be coated are nearly paralleled with a gravity direction and a coating liquid is previously made to flow down from coating liquid supplying means 20 and 20 to form coating on both surfaces thereof. In succession, revolving shafts 11 and 11 arranged to put the material to be coated in-between from both sides are nearly horizontally passed between the coating application rolls 10 and 10 coated with the coating liquid while moving the material 1 to be coated to the upper direction at constant speed, by which the coating films of the desired film thickness are formed on both surfaces of the material 1 to be coated and the planar coated material is manufactured. The coating device has fixing means for the material 1 to be coated, coating roll means having the coating rolls 10 and 10, coating liquid supplying means 20 and 20 for the material to be coated, conveying means for moving the material 1 to be coated or the coating roll means, etc., in a perpendicular direction and coating liquid supplying means for the rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sheet-like molded product, which has abrasion resistance, antistatic property, antireflection property, antifouling property, and the like.
Apply a coating solution containing a material or a coloring agent that imparts various functions such as anti-fog properties and light absorption properties, and apply various functional coatings and protective films,
The present invention relates to a method for producing a plate-like coated article having a colored film, a decorative coating, etc., and a coating apparatus suitable for use in the method.

[0002]

2. Description of the Related Art Various methods, such as a dip coating method, a flow coating method, a curtain flow coating method, and a roll coating method, have been conventionally used as a method of applying various chemicals to the surface of a plate-shaped object to be coated. .

[0003]

However, these known coating methods did not have satisfactory performance in terms of productivity and film thickness accuracy. For example, the dip coating method has a problem in that although the film thickness is high and both surfaces can be coated simultaneously, the coating speed is very slow. In the curtain flow coating method and the roll coating method, the coating speed is high and a substantially uniform film thickness can be obtained, but there is a problem in productivity since both surfaces cannot be coated simultaneously. Furthermore, the flow coating method has a problem that the coating can be performed easily and the both surfaces can be coated simultaneously, but the film thickness accuracy of the coating film is poor.

Accordingly, the present inventors have formed a substantially uniform film thickness, can simultaneously coat both surfaces, and have a high coating speed.
In order to develop a coating method with excellent productivity and an apparatus therefor, as a result of intensive research, the coating liquid was allowed to flow in advance on both sides of a plate-shaped coating object whose coating surface was suspended in a substantially vertical direction. By forming a coating film and then moving the object to be coated relatively upward at a constant speed, the coating material is passed between two coating rolls arranged so that the rotation axis is horizontal. It was found that a coated film was formed, and a coated product could be produced with high productivity, and the present invention was reached.

[0005]

That is, according to the present invention, a plate-like object to be coated is gripped so that its surface to be coated is substantially parallel to the direction of gravity, and a coating solution is allowed to flow down on both surfaces in advance to form a coating film. Are formed, and while the object to be coated is continuously moved upward at a constant speed, the two objects are arranged so as to sandwich the object to be coated from both sides, the rotation axis is substantially horizontal, and two pieces of the coating liquid are provided. An object of the present invention is to provide a method for producing a plate-like coated product by simultaneously forming a coating film having a desired film thickness on both surfaces of an object to be coated by passing the film between coating rollers.

According to the present invention, there is also provided a coating apparatus suitable for use in this method. The coating apparatus has a plate-shaped object to be coated such that its surface is substantially parallel to the direction of gravity. Coating roll means having two coating rolls whose rotation axes are substantially horizontal, rotate in different directions from each other, and are kept at an interval through which the coating object can pass; Coating liquid supply means for applying the coating solution to both surfaces of the object; conveying means for moving the applying object or the applying roll means and the applying liquid supplying means for the object in the vertical direction; and applying to the applying roll A coating liquid supply means for supplying a liquid, and a coating liquid is made to flow in advance on both surfaces of the object to form a coating film. By passing between the book applicator rolls And it is configured so as to form simultaneously the coating film on both surfaces of the object to be coated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings. In the drawings, FIG.
1A is a perspective view schematically showing a state in which a coating is performed on a plate-shaped object according to the present invention, and FIG. 1B is a longitudinal sectional view taken along line XX of FIG. It is. FIGS. 2A and 2B schematically show an example of a gripping state of an object to be coated and an example of a conveying unit. FIG. 2A is a front view, and FIG. 2B is a side view. FIG. 3 and FIG. 4 schematically show examples of different fixing means. FIG. 3 (A) is a front view, and FIG.
Is a side view. FIG. 5 is a perspective view showing an example of a coating liquid supply unit for flowing a coating liquid onto an object to be coated. FIG.
Fig. 3A is a perspective view showing another example of the application liquid supply means for a substrate, and Fig. 3B is a longitudinal sectional view taken along line Y-Y of Fig. 3A. FIGS. 7A and 7B show another example of the application liquid supply means for the object to be coated, wherein FIG. 7A is a perspective view, and FIGS. It is the top view and front view which show a different example. FIG.
Regarding the cross-sectional shape of the groove provided on the surface of the application roll,
It is a partial expanded sectional schematic diagram of an application roll which shows some examples. FIG. 9 is a front view schematically showing some examples of the directions of grooves provided on the surface of the application roll.
FIG. 10 shows an example in which a backup roll is provided in FIG.
(A) is a perspective view, and (B) is a longitudinal sectional view along the line ZZ of (A).
FIG. 11 is a side view schematically showing an example in which a coating liquid is supplied to a coating roll from a coating liquid tank provided below the coating roll. FIG. 12 is a side view schematically illustrating an example in which a coating liquid supply unit is provided at a position where the coating roll and the backup roll are in contact with each other. FIG. 13 and FIG. 14 are perspective views schematically showing examples in which the application liquid is supplied to a portion where the application roll and the backup roll are in contact with each other by different application liquid supply means. FIG. 15 is a side view schematically illustrating an example in which a coating liquid is supplied from a coating liquid tank provided below the backup roll to the backup roll, and the coating liquid is transferred to the coating roll. FIG. 16 is a flowchart showing an example of a case where the coating liquid is circulated using the coating liquid supply means shown in any of FIGS. FIG. 17 and FIG.
8 is a graph showing the film thickness distribution on the surface of the coated product obtained in Example 1 and Comparative Example 1 described below.

In the present invention, as shown in FIG. 1, a plate-shaped object 1 is hung so that the surface to be applied is substantially parallel to the direction of gravity, and the surface of the object 1 is coated in advance on both surfaces. The coating liquid is caused to flow down by the liquid supply means 20 to form a coating film. Further, two coating rolls 10, 10 having horizontal rotation axes 11, 11 are arranged so as to sandwich the object 1 from both sides, and the object 1 is relatively upwardly moved at a constant speed. Move the object 1 to apply it to the application roll 1
It passes through while contacting 0,10.

The movement of the object 1 relatively upward in this case means that the object 1 is relatively moved with respect to the application rolls 10 and the application liquid supply means 20 for the object. It means that it is upward, and the application rolls 10 and 1
0 and the application liquid supply means 20 for the object to be coated may not move in the vertical direction, and the object to be coated 1 may be moved upward, or the application roller 1 may be stationary while the object to be coated 1 is stationary. 1
The application liquid supply means 20 may be moved downward. In terms of equipment, it is more advantageous to move the article 1 in the vertical direction as in the former case. Therefore, in a preferred embodiment, the two application rolls 10, 1
Coating liquid supply means 2 for the object to be coated arranged below 0
The coating liquid is allowed to flow down on both surfaces of the object 1 from 0, 20 and then the object 1 is lifted up.
In a state where the vertical position of 10 is fixed, the object 1 is passed through the two application rolls 10 while contacting the two. In the following description, the application roll 1
A mode in which the object 1 moves upward in a state in which the application liquid supply means 20 does not move in the vertical direction and the application liquid supply means 20 for the object is mainly described, but is limited only to this moving direction. Not something.

[0010] The plate-shaped object 1 is a single-wafer object,
Although the type is not particularly limited, for example, a sheet glass or a resin molded product is used. Examples of the resin molded product include (meth) acrylic resin, polycarbonate resin, polyester resin, cellulose resin, polystyrene resin, and styrene- (meth) acrylate copolymer resin.

The size of the object 1 to be coated is not particularly limited, but is usually 300 to 2,000 mm in width and 500 to 2,000 in length.
The thickness is in the range of about 4,000 mm and the thickness is about 0.1 to 20 mm.
The relationship between the width and the length here is such that the long side of the rectangle is the length and the short side is the width. The object 1 is one of the four sides.
The sides are fixed and gripped. FIG. 2 shows a state in which the width direction of the object to be coated 1 is fixed on the fixing frame 8 in the width direction. However, the length direction may be fixed on the upper side. The object 1 is arranged such that the normal of the surface to be applied, which is indicated by a black arrow in FIG. 2B, is parallel to the ground.

The coating apparatus according to the present invention comprises a fixing means for gripping a plate-shaped object 1, an application roll means having two application rolls 10, 10, and an object for flowing a coating solution on both surfaces of the object 1. Coating liquid supply means 20 for coating object, coating object 1
Is moved vertically, or the application rolls 10, 10
Roll means having coating and coating liquid supply means 2 for an object to be coated
It is provided with a transporting means for moving 0, 20 in the vertical direction, and a roll coating liquid supply means for supplying a coating liquid to the coating rolls 10, 10.

The means for fixing the object to be coated 1 is not particularly limited. For example, as shown in FIG. 3, several holes 7, 7 are formed in a portion near the end of the side to be fixed. 7 and the fixing frame 5
Alternatively, as shown in FIG. 4, it may be fixed to the fixed frame 5 by being sandwiched by holding means 8, 8 such as a vice or a fixing screw. Further, a clamp mechanism or the like can be adopted. As shown in FIGS. 2 to 4, the upper gripping portion of the workpiece 1 gripped by the fixing means is usually arranged above the coating liquid supply means 20 for the workpiece, and the upper gripping portion is provided. The application liquid is applied from below, but in other figures,
Illustration of such fixing means is omitted. Further, the upper side grip portion where the coating liquid is not applied in this way and the coating film is not formed is usually cut off after the coating is completed.

As shown in FIG.
The coating rolls 10, 10 have rotating shafts 11 that are substantially horizontal, rotate in different directions from each other, and are maintained at an interval through which the article 1 can pass. . Below the coating roll means, coating liquid supply means 20 for the object to be coated are arranged.

The coating liquid supply means 20 for the object to be coated
The coating liquid is caused to flow down on the coating surface of the coating object 1 to form a coating film. Therefore, it is necessary to flow down the coating liquid so that the coating liquid is formed almost uniformly over the entire area of the object 1 in the horizontal direction. The method of flowing the coating liquid is not particularly limited. For example, a method of discharging the coating liquid from the tip of the coating liquid supply die 21 as shown in FIG. 5, or a method of providing a preliminary tank 22 as shown in FIG. ,
A method in which the overflowing coating liquid flows down through a gutter 23 provided at the end of the auxiliary tank 22 can be adopted. Further, as a modification of the die shown in FIG. 5, as shown in FIG. 7, a plurality of nozzles 24, 24 are arranged in a horizontal direction at regular intervals so that the coating liquid flows down over the entire area of the object to be coated in the horizontal direction. It may be. FIG. 7A is a perspective view showing an example in which such a plurality of nozzles 24, 24 are arranged in a horizontal direction, and FIGS. 7B to 7D show the tips of the nozzles 24. Here are some examples,
(B)-(D) (upper row) is a view of the nozzle tip of (A) viewed from above, and (lower row) is a view of the nozzle tip of (A) viewed from the side (discharge side). . Nozzle 24 in this case
May be an ordinary pipe shape as shown in FIG. 7B, or the tip of the nozzle may be spread in the horizontal direction and flow down as shown in FIG. It may be elongated in the horizontal direction, or may be a shower-down type as shown in FIG.

As shown in FIG. 1, a coating liquid collecting tank is provided below the coating liquid supply means 20, 20 for the purpose of recovering the coating liquid and preventing the falling coating liquid from scattering. 25 are arranged. The size of the coating liquid recovery tank 25 is not particularly limited, and is appropriately selected according to the size and shape of the article 1 to be coated. However, it is necessary that the object 1 be large enough to accommodate the whole except for the part that is gripped by the fixed frame 5. In other drawings, illustration of the coating liquid recovery tank 25 may be omitted.

The fixed object 1 is relatively moved at a constant speed in the vertical direction. The direction of movement of the object 1 when it comes into contact with and passes between the application rolls 10, 10 is indicated by the outline arrows in FIGS. Supply means 20, 2
0 is an upward direction perpendicular to the ground. The transport means moves the object 1 or the application rolls 10 and the application liquid supply means 20 for the object in the vertical direction. For example, as shown in FIG.
A method in which the fixed frame 5 is connected to the ball screw 3 connected to the motor and conveyed can be used. That is, in this example, the rotation of the ball screw 3 causes the fixed frame 5 screwed thereto to move in the vertical direction, and the workpiece 1 gripped by the fixed frame 5 also moves in the vertical direction. ing. In this case, in order to smoothly and stabilize the movement, the guide rails 4, 4 for guiding the fixed frame 5 in the vertical direction are used.
May be provided. Of course, the same means may be used to move the application roll means including the application rolls 10 and the application liquid supply means 20 for the object to be coated. Although the vertical moving speed of the object 1 is not necessarily limited, a value of about 0.5 to 20 m / min is usually adopted. If the moving speed is too slow, the productivity is reduced, and if it is too fast, the coating film surface may be disturbed.

As shown in FIG. 1, a coating liquid is applied to both surfaces of a coating object 1 in advance by coating liquid supply means 20 for coating the object, and then two parallel coating rolls 10 and 1
By passing through 0, the excess coating liquid is pulled up while being removed, and a coating film having a uniform thickness is formed on both surfaces. The size of the application rolls 10 and 10 is appropriately selected according to the size of the object 1 to be coated.
Use a roll that is 10 to 1,000 mm longer than the horizontal length. The diameter of the roll is not particularly limited, but is usually about 10 to 500 mm in diameter.

The material of the coating rolls 10, 10 is not particularly limited, but generally, a material having resistance to the coating liquid is selected. In order to follow deformation such as warping or bending of the article 1 to be coated, the surfaces of the coating rolls 10 are preferably made of an elastic material such as rubber or resin. The rubber or resin forming the surfaces of the application rolls 10 and 10 may be appropriately selected from materials having resistance to the application liquid. For example, if the coating solution contains an organic solvent,
It is appropriately selected from butyl rubber, ethylene-propylene rubber, nitrile rubber, styrene-butadiene rubber, silicone rubber, urethane resin, fluorine resin and the like according to the solvent used. The thickness of the elastic layer on the surface of the roll is not particularly limited, but is usually about 3 to 50 mm. The elastic body preferably has a hardness of about 20 to 80 degrees as measured by an A-shape in a spring hardness test specified in JIS K6301.

The surface of the application roll 10 may be flat or may have irregularities. In addition, in order to adjust the coating film to a desired thickness, as shown in FIGS.
Fine grooves 13 can also be formed on the surface of the application roll 10. Fine grooves 1 formed on the surface of the application roll 10
As the shape of 3, for example, a V-shaped cross section as shown in FIGS. 8A and 8B, a semicircular shape as shown in FIG. ), And the like. The fine grooves 13 are shown in FIG.
As shown in FIG. 2, a plurality of concentrically-formed pieces may be formed on the application roll 10, or one or more pieces may be formed in a spiral shape as shown in FIGS. ,
Further, as shown in FIG. 4D, the roll may be formed in the length direction of the roll. Although the depth of the fine grooves 13 formed on the surface of the application roll 10 is not particularly limited, it is usually 0.1.
It is about 01 to 1 mm. The distance between the center of the groove and the center of the adjacent groove (the distance between the grooves) is not particularly limited, but is usually about 0.01 to 5 mm. Between the groove and the adjacent groove, there may be a flat portion as shown in FIGS. 8A, 8C and 8D, or even if there is no flat portion as shown in FIG. I do not care.

In order to consciously change the film thickness of a peculiar portion of the object 1 to be coated, the depth and / or the interval of the fine grooves 13 formed on the surface of the application roll 10 are changed.
Can also be varied between the two ends. For example, when it is desired to increase the thickness of the coating film only at a specific portion, the depth of the groove 13 in the corresponding portion of the application roll 10 may be increased, or the interval between the grooves 13 may be reduced. A coating film having a thickness can be obtained.

The diameter of the coating roll 10 is usually constant from one end to the other end, but the diameter of the cross section changes from one end to the other end depending on the properties of the target coating product. It can also be done. For example, object 1
A crown may be provided in the length direction of the application roll 10 so that the contact pressure with the roller is constant, so that the diameter of the central portion is slightly larger than that of the end portion. Further, in order to reduce or increase the pressure of a unique portion of the coating object 1, the diameter of the roll at that portion may be reduced or increased. Even when the diameter of the roll cross section is changed from one end to the other end of the roll as described above, the ratio of the change is such that the diameter of the smallest portion is 90% or more with respect to the diameter of the largest portion. Is advantageously at least 99%.

As shown in FIG. 1, the coating rolls 10 and 10 scrape the coating liquid film formed on both sides of the coating object 1 to make the coating film pressure uniform so that the coating object 1 can pass therethrough. Are installed at intervals. The gap between the two application rolls 10 varies depending on the material. For example, when the surface is made of an elastic body as described above, the object 1 is sandwiched when no load is applied, that is, the object 1 is sandwiched. It is preferable that the thickness be equal to or smaller than the thickness of the article 1 to be applied, assuming that the object 1 is not covered. Thus, the application roll 1
If the no-load gap of 0, 10 is set to be equal to or smaller than the thickness of the coating object 1, the coating rolls 10,
The surface elastic body 10 has a substantially unchanged shape or a compressed shape, and the article to be coated 1 passes between them. In other words, when the surfaces of the application rolls 10 and 10 are elastic, the application roll 1
The gap between 0 and 10 is kept almost the same as the thickness of the object to be coated 1 by the elastic deformation of the elastic body in some cases, but is equal to the thickness of the object to be coated 1 when the elastic deformation is released. It is advantageous to keep it smaller. Preferably, this gap is 10 to 1 with respect to the thickness of the object 1 to be coated.
About 0%, and 0 to 2 times larger than the thickness of the object 1 to be coated.
It is more preferable to set the value smaller by mm. Coating roll 10,
If the gap 10 is larger than the thickness of the object 1, it tends to be difficult to make the film thickness of the coating liquid uniform.

In starting the coating, first, the gap between the coating rolls 10, 10 is widened, the object 1 is lowered during the interval, and the upper ends of the coating liquid supply means 20, 20 for the object are coated. The position is set to be slightly lower than the lower end of the fixed frame 5 that grips 1. At this time, the application liquid supply means 20 for the object to be coated may stop the flow of the application liquid while the object 1 is descending, and may start the flow of the application liquid after the position of the object 1 is set. However, the coating liquid may have already flowed down when the object 1 is lowered. Thereafter, the object 1 is raised at a constant speed, and the lower ends of the fixed frames 5 are applied to the application rolls 10 and 10.
In the vicinity of the uppermost end of the substrate, the interval between the application rolls 10 and 10 is reduced to set the above-mentioned predetermined clearance, the object 1 is pulled up at a predetermined speed, and a desired amount of the application liquid is applied to both surfaces of the object 1. To be applied. The horizontal movement of the application rolls 10 and 10 can be performed by, for example, driving by a motor, driving by air pressure or hydraulic pressure, or the like.

When the interval between the application rolls 10 is narrowed and set to a predetermined value, the movement of the object 1 is not stopped.
The roll interval may be set while moving it upward, or the roll interval may be set in a state where the upward movement of the object 1 is stopped. When setting the roll interval while raising the work 1, the application roll 1
It suffices to bring 0 and 10 closer to the object 1. When the interval between the application rolls 10 and 10 is set by stopping the lifting of the workpiece 1, the rising may be started immediately after the setting, or the rising may be started after a predetermined time, for example, several seconds after the setting. May be.

Each of the two application rolls 10 may have a driving means such as a motor for rotational driving, or a special driving means is not provided. May be rotated. These coating rolls 1
Reference numerals 0 and 10 rotate the object 1 in the same direction as the moving direction. More specifically, while the object 1 moves upward, the application rolls 10 and 10 rotate on the opposite side of the object 1 while rotating so as to face upward. Contact through liquid layer. As described above, since the application rolls 10 and 10 rotate in the same direction as the traveling direction of the article 1 to be coated, the rotation direction is different between the two rolls 10 and 10. The rotation speed of the application rolls 10, 10 is not particularly limited, and is appropriately selected according to the diameter of the rolls and the moving speed of the object 1 to be coated.
A range of about pm is preferred. In terms of rotational peripheral speed,
It is about 0.1 to 20 m / min. Application rolls 10, 10
In particular, when the surface is made of an elastic body such as rubber or resin, it is desirable to determine the rotation speed so that the peripheral speed is the same as the traveling speed of the object 1.

The application roll means includes two rolls 10, 1
However, as shown in FIG. 10,
Backup rolls (auxiliary rolls) 15, 15 may be provided on the opposite sides of the application rolls 10, 10 from the object 1, so as to be in contact with the application rolls 10, 10. in this case,
The application roll 10 and the backup roll 15 are parallel,
It is desirable to press both. The backup roll 15 rotates in synchronization with the application roll 10 in a different direction. The rotation speeds of the application roll 10 and the backup roll 15 are equal to each other at the surface speed, and by driving a motor or the like provided on one of the rolls,
The other roll may be driven, or both rolls may be provided with driving means such as a motor. Of course, as described above, no drive means is provided for any of the rolls, and the coating roll 10 is rotated by friction caused by the upward movement of the workpiece 1 so that the rotation is further transmitted to the backup roll 15. Good.

The material of the backup roll 15 is not particularly limited, but generally a material having resistance to the coating solution is selected. Usually, a metal roll of stainless steel or the like is preferably used from the viewpoint of ease of surface processing and rigidity. The surface of the backup roll 15 may be flat or uneven. Further, in order to apply a desired amount of the coating liquid to the coating roll 10 as described later, a fine groove or a fine hole can be formed on the surface of the backup roll 15. Examples of the shape of the fine grooves formed on the surface of the backup roll 15 include a V-shaped cross section, a semicircular cross section, and a trapezoidal cross section. The fine grooves are used for the backup roll 15
A plurality of concentric circles may be formed thereon, or one or a plurality of concentric circles may be formed spirally, and furthermore, they may be formed in the length direction of the roll. The grooves provided on the backup roll 15 may be substantially the same as those shown in FIGS. When minute holes are formed on the surface of the backup roll 15, a circular shape, a polygonal shape such as a triangular shape or a quadrangular shape is appropriately used. When a fine groove or hole is provided, its depth is not particularly limited, but is usually 0.00.
It is preferably about 1 to 1 mm. The diameter of the backup roll 15 is not particularly limited, but is usually 50 to 500 in diameter.
What is necessary is just to select suitably from the range of about mm.

On the application rolls 10, 10, the object 1 to be coated is placed.
The coating liquid adheres by contact with the coating liquid, but the coating liquid is applied by another route. Therefore, in the coating apparatus of the present invention, a roll coating liquid supply unit for supplying a coating liquid to the coating rolls 10 and 10 is provided. Normally, it is preferable to apply the coating liquid so that the coating liquid adheres to the entire surface of the coating rolls 10 before contacting the coating object 1.
For example, as shown in FIG. 11, roll lower tanks 26, 26 are provided below the application rolls 10, 10, and the roll lower tanks 2 are provided.
The coating liquid can be applied on the coating rolls 10 by dipping the coating rolls 10 in the coating liquid in the coating rolls 6 and 26.

When the backup rolls 15 and 15 are provided, as shown in FIG.
A method of arranging 0 and letting the coating solution flow down therefrom can be adopted. In this case, as shown in FIG. 13, the application liquid supply member 30 constituted by a flow nozzle may be installed near one end of a portion where the application roll 10 and the backup roll 15 are in contact with each other. As shown, the application roll 1
A coating liquid supply member 30 composed of a plurality of flow nozzles is disposed from one end of the portion where the backup roll 15 contacts the other end to the other end of the roll. Thus, the coating liquid may be supplied substantially uniformly. Although the supply amount of the coating liquid is not particularly limited, it is usually sufficient that the coating liquid adheres to the entire coating roll 10, and is appropriately selected, for example, from a range of about 0.1 to 5 L / min. This amount is applied to the application roll 10
And it changes according to the diameter and length of the backup roll 15. Usually, it is sufficient that a liquid pool of the application liquid is formed over the entire area where the application roll 10 and the backup roll 15 are in contact with each other.

FIG. 15 shows another example of a method of supplying a coating liquid to the coating roll 10. In this example, a lower roll tank 26 is provided below the backup roll 15, and the lower end of the backup roll 15 is immersed in the coating liquid in the lower roll tank 26 to supply the coating liquid onto the backup roll 15. The coating liquid is transferred onto the coating roll 10 at the portion where the backup roll 15 contacts. The method shown in this figure is particularly effective when fine grooves or fine holes are provided on the backup roll 15. Also, as can be seen from this example, the roll application liquid supply means for supplying the application liquid to the application roll is:
This includes not only a form in which the coating liquid is supplied directly to the coating roll, but also a form in which the coating liquid is supplied indirectly. 13 to FIG.
In FIG. 5, the application roll 10 and the backup roll 15 are shown on only one side, but it is easily understood that the other application roll and the backup roll are arranged symmetrically to the illustrated one on the opposite side. Will.

In the present invention, the coating liquid is preferably circulated by a circulating means such as a pump. Specifically, a tank for storing the coating liquid is provided, and from this tank, the coating liquid is supplied again through the coating liquid supply unit for the object to be coated and the coating object, and again through the coating liquid supply unit and the coating roll unit for the roll. The application liquid is circulated so as to return. FIG.
FIG. 1 shows an example of a flowchart in the case of circulating the coating liquid. In this example, the application liquid is pumped up from a main tank 28 containing the application liquid via a pump 31, branched after passing through a path 32, and is supplied from an application liquid supply path 33 for the object to be applied. The application rolls are supplied to supply means 20, 20, while the coating liquid supply paths 34, 34
And / or a backup roll 15, and / or from the lower tank application liquid supply path 35, 35 to the lower tank 26, 26. In this example, the pump 31 supplies the coating liquid to the application roll means including the application rolls 10 and 10 and the coating liquid supply means 2 for the object to be coated.
Although it also serves as a supply to 0 and 20, it may be a separate system using separate pumps.

When the coating liquid is supplied between the coating roll 10 and the backup roll 15 in the form of a flow nozzle as shown in FIGS. 12 to 14, the leading ends of the coating liquid supply paths 34, 34 in FIG. A flow nozzle is formed from which the coating liquid flows. Even in this case, the lower roll tank 26 is positioned below the application roll 10 and the backup roll 15 so as not to contact the backup roll.
Is disposed so that the surplus liquid in the liquid pool between the application roll 10 and the backup roll 15 flows down there. On the other hand, as shown in FIG. 15, when the lower end of the backup roll 15 is immersed in the coating liquid in the lower roll tank 26 to apply the coating liquid to the backup roll 15, the lower roll tank 26 is required. As shown in FIG. 16, the coating liquid may be disposed immediately below the backup roll 15 and the coating liquid may be supplied from the coating liquid supply paths 35 for the lower tank to the lower tanks 26. In this case, there is no need to supply the coating liquid from the roll coating liquid supply paths 34, 34.

In each case, the roll lower tank 26
The excess coating solution of the
After passing through 6, 36, it is collected in the main tank 28. on the other hand,
Excess coating liquid after being supplied from the coating liquid supply means 20 for the coating substance to the coating substance and the coating liquid scattered at that time are collected in the coating liquid recovery tank 25, and from there, passed through the recovery path 37. And collected in the main tank 28 in the same manner. However, when the supply of the coating liquid to the coating liquid supply path 33 for the object to be coated and the coating liquid supply path 34 for the roll or the coating liquid supply path 35 for the lower roll tank are set as separate paths, the main tank for collection is used. They may be provided separately.

In FIG. 16, the pressure of the coating solution pumped up by the pump 31 is detected by a pressure gauge 38 via a valve. The pressure gauge 38 detects an abnormality such as a clogging of a pipe. Therefore, it is preferable to provide them. Immediately after being pumped up by the pump 31 or between the rolls 10 and 15, the coating liquid supply means 2
It is preferable to remove dust and the like that may be contained in the coating solution by cleaning with a filter 39 or the like before supplying to the zero or roll-under tank 26.

As a circulation system, the pump 31 may be directly pumped from the lower tanks 26, 26 via the recovery paths 36, 36 without passing through the main tank 28 in the flowchart shown in FIG. I do not care. Further, the specific supply means in the application liquid supply paths 34 and 35 can be appropriately selected according to the equipment configuration and the like. FIG. 16 shows a coating liquid circulating system in the case of employing the coating liquid supply means in the form shown in FIGS. 12 to 15, and has been described based on this. Even in this case, circulation of the coating liquid can be performed according to the example shown in FIG. For example, as shown in FIG. 11, when the application rolls 10 are directly immersed in the coating liquid in the roll lower tank 26 to supply the application liquid, the backup rolls 15 are omitted in FIG. 10,1
The circulation of the coating liquid may be performed in substantially the same manner as in this drawing, except that the lower roll tanks 26, 26 are disposed immediately below the zero and the lower ends of the coating rolls 10, 10 are immersed in the coating liquid therein.

By the method described above, a coating film of the coating liquid is formed on both surfaces of the object 1 with a predetermined film pressure. Workpiece 1
After that, the solvent and the like contained in the coating liquid are removed by drying to produce a product. Alternatively, after the solvent is removed, if necessary, the film is cured or cured by irradiation with activating radiation such as ultraviolet light or an electron beam, whereby the film is cured to form a product. The thickness of the coating film after drying or curing depends on the concentration and viscosity of the coating liquid, the speed at which the object 1 moves upward while contacting the coating rolls 10, 10, and the coating roll 10 at that time. , 10 and the like. According to the present invention, it is possible to form a coating film having a desired substantially uniform thickness in a range of, for example, about 30 nm to 20 μm.

The method and apparatus of the present invention are suitable for applying both sides of an object to be coated, but can be applied to application of only one side if desired. For example, two objects to be coated are overlapped, and the ends thereof are fixed with a double-sided adhesive tape or the like, and the two objects are arranged according to the present invention in a state where they are brought into close contact with each other so that the application liquid does not enter the gap between the two objects. After passing through the coating liquid supply means for the object to be coated and the two rolls, the coating is performed, after the coating, or after any necessary post-processing is performed,
By peeling off the two objects to be coated, a single-sided coated product can be obtained. According to this method, since two sheets can be coated simultaneously, productivity is improved as compared with the conventional method.

[0039]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. The percentages in the examples are on a weight basis unless otherwise specified. All hardness values are values measured by a JIS K 6301 spring hardness test (A type).

Example 1 An anti-reflection coating “OPSTAR JM5022” was used as a coating liquid.
[JR Co., Ltd .; paint containing 3% fluorine resin] diluted with methyl isobutyl ketone to a concentration of 2% was used. As an object to be coated, a polymethyl methacrylate resin plate having a width of 930 mm, a length of 1,300 mm, and a thickness of 2.5 mm [SUMIPEX E0 manufactured by Sumitomo Chemical Industries, Ltd.]
00 "]. The polymethyl methacrylate resin plate was fixed to the transfer device shown in FIG.

The application rolls 10, 10, the backup rolls 15, 15, the application liquid supply means 20, 20, and the application liquid recovery tank 25 for the object are arranged as shown in FIG. The coating liquid supply means 20 for the object to be coated has a system in which the overflow in the preliminary tank 22 as shown in FIG. Further, as the application rolls 10, 10, two rolls each having a length of 1,500 mm and a diameter of 100 mm having a surface layer of about 10 mm thick formed of butyl rubber having a hardness of 40 degrees were used. These coating rolls 10 and 10 were smoothed by polishing, and were subjected to groove processing parallel to the roll length direction as shown in FIG. 9D. The shape of the groove is V-shaped with a 90 ° angle, the depth is 0.15 mm, and the groove interval is 0.5 mm
And The gap between the two application rolls 10, 10 was adjusted to 1.5 mm at the time of application (provided that no load is applied). The roll gap is defined by the rotation axes 11, 11 of the rolls.
Corresponds to a center-to-center distance of 101.5 mm. The application rolls 10, 10 are not provided with a driving means for rotation, and the backup rolls 15, 15 are connected to a motor for rotational drive, and follow the rotation of the backup rolls 15, 15 to follow the rotation of the application rolls 10, 15. 10 was rotated. The supply of the coating liquid to the coating rolls 10 and 10 is as follows.
As shown in FIG. 15, a system in which the image is transferred from the roll lower tank 26 via the backup rolls 15, 15 was used.
The circulation form of the coating liquid in this apparatus is generally as shown in FIG.

The object 1 to be coated is composed of two application rolls 10, 1
In a state where the interval of 0 is opened to 50 mm, firstly, the lower portion of the fixing frame 5 for fixing the work 1 is once lowered between the coating rolls 10 at a speed of 3 m / min. The means 20, 20 were stopped at a position 10 mm above the upper end. The coating liquid had already flowed down from the coating liquid supply means 20 for the coating object when the coating object 1 descended. Then, while continuing the flow of the coating liquid by the coating liquid supply means for coating substances 20, 20, the lifting of the coating substance 1 is started, and the lower end of the fixed frame 5 is 10 mm higher than the uppermost ends of the coating rolls 10, 10. When it reached the upper position, the pulling of the object 1 was temporarily stopped. Next, the application rolls 10, 10
, The gap is reduced to 1.5 mm as described above, and the object 1 is immediately pulled up at a speed of 3 m / min.
A coating film was formed on the surface of. The obtained coated product is at 40 ° C.
And then irradiate with 500 mJ / cm ² ultraviolet light,
The coating was cured.

The thickness of the cured film was determined by coating the back surface of the obtained coating with black paint and then using a spectrophotometer “UV-3100PC”.
It was calculated by measuring the absolute specular reflection spectrum at an incident angle of 5 degrees using [manufactured by Shimadzu Corporation]. Film thickness d
(Nm) was calculated from the wavelength λ (nm) at which the reflectance became the minimum by the following equation.

D = λ / 4n [n is the refractive index of the cured film = 1.437]

The film thickness was measured at an interval of 100 mm in the length direction of the coated product (vertical direction during conveyance), and the results are shown in FIG. From this result, it is understood that the coating film is formed with a substantially uniform thickness.

COMPARATIVE EXAMPLE 1 With the gap between the coating rolls 10, 10 widened to 50 mm, that is, with the coating material 1 not in contact with the coating rolls 10, 10, the coating material 1 was raised and flow-coated. Other than that, it operated similarly to Example 1. The film thickness of the obtained cured film is 1 in the length direction of the coated product (vertical direction during transport).
The measurement was performed at intervals of 00 mm, and the results are shown in FIG.

[0047]

According to the method of the present invention, it is possible to form a coating film which can be coated simultaneously on both sides at a higher production speed than before, and has a good appearance and a high uniformity of the film thickness. . According to the present invention, there is also provided a coating apparatus suitable for this method.

[Brief description of the drawings]

FIG. 1 schematically shows a state in which a plate-shaped object is applied according to the present invention, wherein (A) is a perspective view,
(B) is a longitudinal sectional view along line XX of (A).

FIGS. 2A and 2B schematically show an example of a gripping state of an object to be coated and a transporting means, wherein FIG. 2A is a front view and FIG. 2B is a side view.

FIG. 3 schematically shows an example of a fixing means,
(A) is a front view, (B) is a side view.

4A and 4B schematically show another example of the fixing means, wherein FIG. 4A is a front view and FIG. 4B is a side view.

FIG. 5 is a perspective view illustrating an example of a coating liquid supply unit for a coating object;

6A and 6B show another example of the application liquid supply means for an object to be coated, wherein FIG. 6A is a perspective view, and FIG. 6B is YY of FIG.
It is a longitudinal cross-sectional view along a line.

FIGS. 7A and 7B show another example of the application liquid supply means for an object to be coated, wherein FIG. 7A is a perspective view, and FIGS. It is the top view and front view which show this.

FIG. 8 is a partial enlarged cross-sectional schematic view of an application roll showing some examples of a cross-sectional shape of a groove provided on a surface of the application roll.

FIG. 9 is a front view schematically showing some examples of directions of grooves provided on the surface of an application roll.

FIG. 10 shows an example of providing a backup roll in FIG.
(A) is a perspective view, and (B) is a cross-sectional view taken along the line Z-Z in (A).

FIG. 11 is a side view schematically showing an example in which a coating liquid is supplied to a coating roll from a coating liquid tank provided below the coating roll.

FIG. 12 is a side view schematically illustrating an example in which a coating liquid supply unit is provided at a position where a coating roll and a backup roll are in contact with each other.

FIG. 13 is a perspective view schematically illustrating an example of a state in which a coating liquid is supplied to a portion where a coating roll and a backup roll are in contact with each other.

FIG. 14 is a perspective view schematically showing another example of a state in which the application liquid is supplied to a portion where the application roll and the backup roll are in contact with each other.

FIG. 15 is a side view schematically illustrating an example in which a coating liquid is supplied to a backup roll from a coating liquid tank provided below the backup roll, and the coating liquid is transferred to the coating roll.

FIG. 16 is a flowchart illustrating an example of a case where a coating solution is circulated.

FIG. 17 is a graph showing a film thickness distribution in the vertical direction on the surface of a coating product obtained in Example 1.

FIG. 18 is a graph showing the film thickness distribution in the vertical direction on the surface of a coating product obtained in Comparative Example 1.

[Explanation of symbols]

1 ... object to be coated, 3 ... ball screw connected to motor, 4 ... guide rail, 5 ... fixed frame, 6 ... hanging tool, 7 ... hole for fixing frame, 8 ... clamping means, Reference Signs List 10: coating roll, 11: rotating shaft of coating roll, 13: groove on coating roll, 15: backup roll, 20: coating liquid supply means for coated object, 21: die for coating liquid supply .., 22... A spare tank provided in the application liquid supply means for the object to be coated 23... A gutter, 24... A nozzle, 25... A coating liquid recovery tank, 26. …… Coating liquid supply member (piping and nozzle), 31… Pump, 33… Coating liquid supply path for coated object, 34… Roll coating liquid supply path, 35… Roll lower tank coating liquid supply path , 36, 37 ... Coating liquid recovery path, 38 ... … Pressure gauge, 39 …… Filter.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 1/40 B05D 1/40 Z 3/00 3/00 F G03F 7/16 501 G03F 7/16 501 ( 72) Inventor Hikaru Iwamoto 222-1 Nakasuji, Kamimaki-cho, Kitakatsuragi-gun, Nara F-term (reference) 2H025 EA04 4D075 AC11 AC54 AC78 AC92 AE24 AE27 BB92Z CA02 CA22 CA34 CA39 CB02 CB07 DA06 DB13 DB37 DB43 DB48 DB49 EA07 EA10 EA19 EA21 EB16 EB56 4F040 AA02 AB04 BA12 BA16 CB03 CB06 CB14 CB21 CB26 CB29 4F041 AA02 AB01 BA34 BA56 CA02 CA13 CA16 4F042 AA02 AB00 BA25 CA01 CB20 CC01 DD09 DD18 DD41 DD

Claims (8)

[Claims] 1. A plate-like object to be coated is gripped so that its surface to be coated is substantially parallel to the direction of gravity, and a coating solution is allowed to flow in advance on both sides thereof to form a coating film. While moving the object relatively upward at a constant speed, the object to be coated is passed between two application rolls arranged so as to sandwich the object to be applied from both sides, the rotation axis being substantially horizontal, and having an application liquid. A method for producing a plate-like coated product, wherein a coating film having a desired film thickness is simultaneously formed on both surfaces of the coated object. 2. An application liquid is supplied from both sides of an object to be applied from an application object application liquid supply means disposed below the two application rolls, and the object is subsequently lifted up. 2. The method according to claim 1, wherein the object is passed between two application rolls while the vertical position of the rolls is fixed. 3. The coating roll surface is formed of an elastic body, and the gap between the coating rolls when the object passes between the two coating rolls may be elastically deformed by the elastic body. 3. The method according to claim 1, wherein the thickness of the object is maintained substantially equal to the thickness of the object, but is equal to or smaller than the thickness of the object when the elastic deformation is released. 4. A means for fixing an object to be coated which grips a plate-shaped object so that its surface to be coated is substantially parallel to the direction of gravity;
Coating roll means having a rotation axis substantially horizontal, rotating in different directions from each other, and having two coating rolls maintained at an interval through which the coating object can pass; Means for supplying a coating liquid for a coating material; transport means for vertically moving the coating object or a coating roll means and a coating liquid supplying means for a coating substance; and a coating liquid for a roll for supplying a coating liquid to the coating roll A coating means is provided, and a coating solution is caused to flow down in advance on both surfaces of the object to form a coating film. Then, the coating material passes between the two application rolls while moving the object relatively upward. A coating apparatus characterized in that the coating film is formed on both surfaces of the object to be coated at the same time. 5. The coating apparatus according to claim 4, wherein the surface of the coating roll is made of an elastic body. 6. The coating apparatus according to claim 4, wherein a fine groove is formed on the surface of the coating roll. 7. The coating roll according to claim 4, wherein the coating roll has a backup roll on the opposite side of the coating roll from the object to be coated, the backup roll rotating in synchronism with the coating roll and in a direction different from that of the coating roll. Coating device. 8. A tank for containing a coating liquid, from the tank to the tank via a coating liquid supply means for the object to be coated and an object to be coated, and to the tank via a coating liquid supply means and a coating roll means for a roll. The apparatus according to any one of claims 4 to 7, further comprising a circulating means for circulating the coating liquid to the tank.