JP2006198477A - Blade coating method, disk coating method using this and blade coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade coating method realizing stable coating of a coating liquid by preventing generation of scattered drop of the coating liquid when an optical disc is left from a mask plate by a simple apparatus constitution, a disc coating method using this and a blade coater, and to realize coating of a coating liquid having a good surface property. <P>SOLUTION: The apparatus is provided with the mask plate 25 having an opening 27; a coating liquid feeding part 41 for feeding the coating liquid 49 onto the mask plate 25 superposed on a flat surface substrate (optical disc) D; a blade 51 relatively moved relative to the mask plate 25 above the mask plate 25; and a mask peeling off means (air cylinder) 23 for leaving the mask plate 25 and the flat surface substrate D after the mask plate 25 is coated with the coating liquid 49. When the mask plate 25 and the flat surface substrate D are left by the mask peeling off means 23, a liquid film breakage means for breaking the liquid film 49A generated between an opening edge 25a of the mask plate 25 and the flat surface substrate D is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blade coating method for coating a flat substrate with a coating solution using a blade, a disk coating method using the same, and a blade coating apparatus.

  Various proposals have heretofore been made in order to stably apply a liquid paint to an application surface of a member to be applied. For example, in the coating apparatus disclosed in Patent Document 1 below, the coating liquid stored in a pocket made up of a side frame that is slidably contacted with an object to be coated and two blades that are interposed between the side frame is provided at the lower end of the blade on the downstream side in the traveling direction. Lubricating layer forming means is provided for forming a lubricating layer on the upper surface of the coated body, which is applied to the coated body by flowing out from the gap onto the coated body. Thereby, the slipperiness of the lower surface of the side frame is improved, and the occurrence of horizontal stripes continuous in the direction in which the blade passes on the coating surface is prevented.

  In addition, in the substrate coating apparatus disclosed in Patent Document 2 below, the substrate is sandwiched between a microrod bar whose lower part is immersed in a coating solution tank and a nip roller disposed opposite to the microrod bar. Thus, a coating liquid is applied to the lower surface of the substrate, and a push-up member that supports the front edge of the substrate from below and restricts the deflection of the front edge of the substrate is provided on the substrate entrance side of the microrod bar. As a result, the coating thickness in the vicinity of the center of the front edge of the substrate is prevented from becoming thicker than both sides, and coating is performed with a uniform coating thickness. In addition, the vicinity of the center of the rear edge of the substrate is prevented from coming into contact with the cough on the outlet side of the coating solution tank, and coating is performed with a uniform coating thickness.

  Furthermore, in the roll coater disclosed in Patent Document 3 below, a transport base and a coating roll for transporting a thin plate to be coated are provided, and the liquid agent is moved to the surface of the thin plate by moving the transport base below the coating roll. The carrier plate is placed on the upper surface of the substrate with a grip plate for gripping the thin plate with a gap interposed therebetween, and the center of the thin plate is placed in the middle of the surface direction of the gap in a line segment passing in the moving direction of the carrier table. On the other hand, the elastic material is arranged symmetrically with respect to the line, and the periphery of the gripping plate is regulated by the gap regulating means so that the gap can be adjusted. As a result, when the gripping plate presses and passes the coating roll, the reaction force (elastic force) of the elastic material is controlled so as to relax within the range of the gap and relieve the impact at the time of contact intrusion. The accompanying coating unevenness is prevented.

  FIG. 12 shows a conventional disk coating apparatus that forms a printable coating liquid layer (ink receiving layer) by coating a coating liquid on a disk-shaped recording medium such as an optical disk to a thickness of about 100 μm. There is. This disk coating apparatus 1 includes a suction plate 2 for sucking and mounting an optical disk D, an air cylinder 3 for moving the optical disk D in the vertical direction together with the suction table 2, and a mask plate having an opening 8 defined by a circular edge 4a ( (Mask) 4 and a blade 5 that forms a coating liquid layer 9 by applying the coating liquid 6 to the optical disc D by being driven horizontally while maintaining a predetermined gap on the mask plate 4.

As shown in FIG. 12A, the application of the coating liquid 6 by the disk coating apparatus 1 is performed by placing the optical disk D on the suction table 2 and fixing it by suction, and then operating the air cylinder 3 to operate the optical disk. D is raised, whereby the mask plate 4 is overlaid on the optical disk D. Then, while supplying the coating liquid 6 onto the mask plate 4, the blade 5 is relatively moved in the direction of arrow A above the mask plate 4, whereby the coating liquid 6 is applied to the optical disk D exposed from the opening 8 of the mask plate 4. Apply to surface 7. Next, as shown in FIG. 12B, the air cylinder 3 is operated to lower the suction table 2 (in the direction of arrow B) to separate the optical disk D from the mask plate 4, and the opening of the mask plate 4 on the optical disk D is opened. A coating liquid layer 9 corresponding to 8 is formed.
JP 63-224761 A Japanese Patent Laid-Open No. 9-10646 JP-A-10-128221

However, in each of the above-described coating apparatuses, problems to be solved remain. First, the coating apparatus disclosed in Patent Document 1 can be configured with a simple structure, but a part of the applicator is supported on the object to be coated, and the relative relationship between the downstream blade and the object to be coated. In order to perform the coating while maintaining a proper interval, the coated body is limited to a belt-like body, and there is a defect that uncoated portions are formed on both ends of the blade.
In addition, since the substrate coating apparatus disclosed in Patent Document 2 nips a substrate and performs coating with a microrod bar from the lower side, coating in the entire width direction is possible, but the object to be coated is a strip or rectangular shape. Limited to shapes. And when the thickness of the liquid film is increased, there is a problem in that the beads are disturbed on the downstream side of the microrod bar and streaks are generated on the coating surface.
Furthermore, the roll coater disclosed in Patent Document 3 enables the application of a disk-shaped object to be coated, and also allows the entire surface of each coated body to be coated, but in order to support each of the coated bodies with an elastic body, If the equipment becomes large and, in addition to this, the liquid film thickness increases, there is a problem that streaks occur as in the case of the substrate coating apparatus described above.

  As described above, in the conventional technology, when the apparatus becomes large, or particularly when the coating thickness is increased, the amount of the coating liquid pushed into the gap between the blade and the coating surface increases, and the blade is distorted to cause the coating direction. As shown above, streaks substantially parallel to the coating direction are generated, and it becomes difficult to ensure a good coating surface. There were drawbacks.

  When the coating liquid 6 is applied to the coating surface 7 of the optical disk D by the conventional disk coating apparatus 1 shown in FIG. 12, the coating liquid 6 is applied from the upper surface of the mask plate 4 and the opening 8 as shown in FIG. It is continuously applied to the application surface 7 of the exposed optical disk D. When the suction table 2 is lowered so as to separate the optical disk D from the mask plate 4, the coating liquid 6 having a predetermined viscosity is stretched in the vertical direction at the circular edge 4a of the opening 8 (FIG. 13 (b)). A substantially cylindrical liquid film 6A is formed between the plate 4 and the optical disc D (FIG. 13C). Further, when the optical disk D is lowered, as shown in FIG. 13D, the liquid film 6A is eventually broken and the coating liquid 6 is scattered as splash droplets 6B. The flying droplets 6B adhere to the coating liquid layer (ink receiving layer) 9 applied to the coating surface 7 of the optical disc D, deteriorate the surface properties, and cause problems in subsequent printing.

  The present invention has been made in view of the above situation, and a blade capable of stably applying the coating liquid by preventing the occurrence of droplets of the coating liquid when the optical disk is separated from the mask plate with a simple apparatus configuration. It is an object of the present invention to provide a coating method, a disk coating method using the same, and a blade coating apparatus, and thereby to enable coating of a coating solution having good surface properties.

The above object of the present invention can be achieved by the following configuration.
(1) After a mask having an opening is overlaid on a flat substrate, a coating solution is supplied onto the mask, and the coating solution is applied onto the mask by a blade that moves relative to the mask above the mask. A blade coating method for separating the mask and the planar substrate to form a coating liquid layer corresponding to the opening of the mask on the planar substrate, immediately after separating the mask and the planar substrate, A blade coating method comprising destroying a liquid film formed between an opening edge of the mask and the planar substrate.

  According to such a blade coating method, immediately after the mask and the flat substrate are separated from each other, the liquid film generated between them can be broken. As a result, when the liquid film that grows with the separation operation spontaneously breaks, it is possible to prevent the droplets from forming and adhering to the flat substrate.

  (2) The separation operation is an operation of starting the separation operation between the opening edge portion of the mask and the planar substrate at different timings according to the position of the opening edge portion (1) ) The blade coating method described.

  According to such a blade coating method, by starting separation at different timings depending on the position of the opening edge, the growth of the liquid film is prevented and the breakage of the liquid film is promoted.

  (3) The separation operation includes mutual movement in the horizontal direction in addition to the vertical movement between the mask and the planar substrate as the separation operation between the opening edge of the mask and the planar substrate. The blade coating method according to (1) or (2).

  According to such a blade coating method, in addition to the vertical movement of the mask and the flat substrate, the horizontal movement is added, so that the generated liquid film is stretched, thereby breaking the liquid film early. can do.

  (4) The blade coating method according to any one of (1) to (3), wherein a liquid film breaking member is brought into contact with the liquid film during the separation operation.

  According to such a blade coating method, the liquid film can be reliably broken by bringing the liquid film breaking member into contact with the generated liquid film.

  (5) A mask having an opening, a coating liquid supply unit that supplies a coating liquid onto the mask superimposed on a flat substrate, a blade that moves relative to the mask above the mask, and the coating liquid A mask coating means for separating the mask and the planar substrate after coating on the mask, and a blade coating device, wherein when the mask and the planar substrate are separated by the mask peeling means, A blade coating apparatus comprising a liquid film breaking means for breaking a liquid film formed between an opening edge of the mask and the planar substrate.

  In the blade coating apparatus configured as described above, when the mask and the flat substrate are separated from each other, since the liquid coating breaking means for breaking the liquid film generated between the opening edge of the mask and the flat substrate is provided, The liquid film can be reliably broken at an arbitrary timing by the liquid film breaking means. In addition, this makes it possible to prevent the droplets generated when the liquid film spontaneously breaks off from adhering to the flat substrate and form a coating liquid layer having a good surface property.

  (6) The liquid film breaking means includes an inclination separation mechanism that separates the mask and the planar substrate in a state of being inclined with respect to each other when the mask peeling means separates the mask and the planar substrate. The blade coating apparatus according to (5), wherein the mask and the planar substrate are separated from each other in an inclined state.

  In the blade coating apparatus configured in this way, when the mask and the flat substrate are separated from each other, the mask and the flat substrate are separated in a relatively inclined state by the inclination separation mechanism. Before the liquid film generated between the substrate and the substrate grows, the liquid film is broken at one point on the opening edge of the mask and the breakage proceeds along the opening edge to reliably break the liquid film. be able to.

  (7) The liquid film breaking means includes a rotation conversion mechanism that converts a linear motion of the mask peeling means into a rotational movement when the mask peeling means separates the mask and the planar substrate, The blade coating apparatus according to (5), wherein the flat substrate is separated from the flat substrate while being relatively rotated.

  In the blade coating apparatus configured as described above, when the mask and the flat substrate are separated from each other, the linear motion of the mask peeling means is converted into the rotational motion by the rotation conversion mechanism, and the mask and the flat substrate are moved in the vertical direction. Since the horizontal movement is given in addition to the movement to separate the liquid film, the liquid film can be reliably destroyed at the initial stage of the liquid film generation.

  (8) The liquid film breaking means includes a liquid film breaking member disposed so as to protrude inward from the outside of the opening of the mask, and the liquid film breaking means is used when the mask and the flat substrate are separated from each other. The blade coating apparatus according to (5), wherein a member is protruded inside the mask opening and brought into contact with the liquid film.

  In the blade coating apparatus configured as described above, when the mask and the flat substrate are separated from each other, the liquid film breaking member is protruded inside the mask opening to come into contact with the liquid film, so that the liquid film grows. The liquid film can be reliably destroyed before

  (9) The blade coating apparatus according to (5), wherein the liquid film breaking means includes a notch formed in at least one position of the opening edge of the mask.

  In the blade coating apparatus configured in this way, a notch is formed in at least one portion of the opening edge of the mask. Therefore, when the mask and the flat substrate are separated from each other, the liquid film is broken from the notch. The liquid film can be destroyed at the initial stage of liquid film generation.

  (10) The blade coating apparatus according to (5), wherein the liquid film breaking means includes a wettability discontinuous portion having a wettability different from the periphery formed at at least one position of the opening edge of the mask. .

  In the blade coating apparatus configured as described above, since the wettability discontinuity having different wettability from the surroundings is formed at least at one position of the opening edge of the mask, the wettability is not improved before the liquid film grows. The liquid film is broken at the continuous portion, whereby the liquid film can be reliably broken.

  (11) A disk coating method, wherein at least one layer of a printing surface of a disk-shaped recording medium is formed by the blade coating method described in (1) to (4).

  According to such a disk coating method, a uniform and high-quality coating liquid layer is formed by forming at least one layer of the printing surface of the disk-shaped recording medium using a coating apparatus capable of coating a large area. can do. Accordingly, for example, a printing layer (ink receiving layer) for performing printing using an ink jet printer can be formed with a thickness having a necessary and sufficient ink receiving capability.

  According to the blade coating method and the disk coating method and blade coating apparatus using the blade coating method of the present invention, when the mask and the flat substrate are separated from each other, before the liquid film generated between the mask and the flat substrate is sufficiently grown. Can be destroyed. As a result, it is possible to prevent the droplets generated when the grown liquid film spontaneously breaks down from adhering to the flat substrate and deteriorating the surface properties of the coating liquid layer. This also makes it possible to form a uniform and high-quality coating solution layer on the printing surface of the disk-shaped recording medium.

Preferred embodiments of a blade coating method, a disk coating method using the same, and a blade coating apparatus according to the present invention will be described below in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an outline of a blade coating apparatus according to the present invention, and FIG. 2 is a perspective view showing an outline of the appearance of the blade coating apparatus shown in FIG.

The blade coating apparatus 100 according to the present embodiment is used for coating a liquid film using, for example, a disk-shaped recording medium (optical disk) D, which is an example of a flat substrate, as a member to be coated.
First, the basic configuration of the blade coating apparatus 100 will be described.
As shown in FIG. 1, the applicator 11 of the blade applicator 100 is provided with a circular suction table 13 on which the optical disk D can be sucked and placed. A plurality of suction holes 15 are opened on the upper surface of the suction table 13, and a vacuum pump 19 is connected to each suction hole 15 via a suction path 17. The suction table 13 can hold the optical disk D on the upper surface through the suction holes 15 by operating the vacuum pump 19.

Further, the suction table 13 is supported by the lifting shaft 21 so that the center of the lower surface is movable in the vertical direction. The vertical movement of the elevating shaft 21 is performed by driving an air cylinder 23 which is an example of a mask peeling means.
A mask plate (mask) 25 is provided above the suction table 13, and the mask plate 25 has an opening 27 for exposing the application surface 57 of the optical disk D. The optical disk D placed on the suction table 13 is covered with the opening edge 25 a of the mask plate 25 when the elevating shaft 21 is raised by driving the air cylinder 23 and reaches the upper limit position.

  The coating unit 11 is provided with a mask cap attaching / detaching means 29 above the center of the optical disc D. The mask cap attaching / detaching means 29 includes a cap suction nozzle 31, a vacuum pump 33, and an elevating means 35. The mask cap attaching / detaching means 29 sucks and holds the mask cap 37 at the lower end of the cap suction nozzle 31 by driving the vacuum pump 33. When the elevating means 35 is driven in this state, the cap suction nozzle 31 is lowered, and the mask cap 37 is inserted into the hole in the center of the optical disc D. The mask cap (center cap) is not limited to this, and may be detached by other mechanical means. For example, there is a method in which the mask cap 37 is pushed up from below and lifted from the mask plate 25, and the mask cap 37 is scooped from the side.

A coating liquid supply means 41 is provided above the mask plate 25 outside the opening 27. The coating liquid supply means 41 includes a coating liquid supply nozzle 43, a coating liquid supply device 45, and a nozzle lifting / lowering device 47. The coating solution supply means 41 supplies the coating solution 49 supplied from the coating solution supply device 45 dropwise onto the mask plate 25 from the coating solution supply nozzle 43. At this time, the coating liquid supply nozzle 43 is moved to the height near the mask plate 25 by the nozzle lifting / lowering device 47 only when the coating liquid 49 is dropped and supplied, and normally rises to a position where it does not interfere with the coating process and is in a standby state It is said.
Here, as the coating liquid 49, for example, one having a liquid viscosity of 150 cP to 800 cP can be used, and in particular, the coating liquid 49 of 200 cP to 600 cP is preferably used. In addition, the liquid viscosity here is a value measured with a B-type viscometer (bismetholone) in an environment of 25 ° C.

  A blade 51 is arranged in a standby state further outside the coating liquid 49 supplied onto the mask plate 25 by the coating liquid supply means 41. The blade 51 is horizontally driven on the mask plate 25 while maintaining a predetermined gap G by the moving means 53, and is exposed through the opening 27 of the mask plate 25 as shown in FIG. It moves so that the coating liquid 49 may be apply | coated to the application | coating surface 57 of the optical disk D made.

  The blade 51 is made of a metal material such as a stainless steel material that is elongated in the direction perpendicular to the paper surface of FIG. 1, and the cross-sectional shape perpendicular to the longitudinal direction of the blade 51 is formed in a substantially trapezoidal shape. In addition, a gap (gap) G is formed between the lower surface of the blade 51 and the mask plate 25, and the coating liquid 49 is pressed as the flow is guided by the front side surface 55 of the blade 51. Pushed into G. Then, the coating liquid 49 is filled in the opening 27 of the mask plate 25 by passing through the lower surface (pressing surface 59) of the blade 51 facing the coating surface 57. As a result, the coating liquid 49 is applied to the coating surface 57 flatly.

  The operations of the vacuum pump 19, the air cylinder 23, the vacuum pump 33, the lifting / lowering means 35, the coating liquid supply device 45, the nozzle lifting / lowering device 47, and the moving means 53 are controlled by the control unit 63.

  Further, the opening 27 of the mask plate 25 has an opening exceeding at least 50 mm continuous along the longitudinal direction of the blade 51, so that the effect of uniform application by the blade application according to the present invention, which will be described in detail later, becomes remarkable. . In the present embodiment, the opening 27 is formed in a circular shape having a diameter of about 120 mm.

  In the blade coating apparatus 100 according to the present embodiment, the coating liquid layer is coated at a thickness of at least 100 μm or more during coating. In the case of such a coating having a thickness of 100 μm or more, the surface property of the coating liquid layer is less likely to follow the surface of the coating surface 57 than in the case of thin film coating, and the shape of the blade 51 has a great influence. Will be affected. That is, the surface of the coating liquid layer is determined by the pressure of the coating liquid 49 by the blade 51, the wettability of the coating liquid 49 by the shape of the blade 51, and the like.

  When this blade coating apparatus 100 is used as a disk coating apparatus for forming at least one recording layer of a disk-shaped recording medium, it forms a printing layer (ink receiving layer) for printing using, for example, an ink jet printer. be able to. According to this disk coating apparatus, it is possible to form a printing layer having a necessary and sufficient thickness so that good color reproducibility can be ensured when printing on the printing layer. Actually, when the coating liquid layer has a thickness of about 100 μm at the time of coating, a coating film of about 30 μm is formed at the time of reduction after drying, and the ink receiving layer of about 30 μm enables good color reproducibility. .

Next, a coating solution coating method using the blade coating apparatus 100 will be described.
FIG. 3 is an explanatory diagram showing the procedure of the coating method according to the present invention in (a) to (c), FIG. 4 is an explanatory diagram showing the procedure of the coating method in accordance with the present invention with (d) to (g), FIG. 5 is a plan view of a member to be coated after coating.
First, as shown in FIG. 3A, the optical disk D is adsorbed on the adsorption table 13 at the lowered position of the elevating shaft 21, as shown in FIG. 3A, and an air cylinder is obtained as shown in FIG. The suction table 13 is lifted by the driving of 23 and the optical disk D comes into contact with the opening edge 25 a of the mask plate 25. Next, as shown in FIG. 3C, the mask cap 37 is inserted into the central hole of the optical disc D by driving the mask cap attaching / detaching means 29.

Then, as shown in FIG. 4D, the blade 51 moves the coating liquid 49 dropped on the mask plate 25 by the coating liquid supply means 41 from the right to the left in the figure by the moving means 53. Then, as shown in FIG. 4 (e), the blade 51 passes through the coating surface 57 of the optical disk D together with the coating liquid 49, and a coating liquid layer having a predetermined thickness is formed on the coating surface 57 of the optical disk D.
Examples of the coating liquid 49 include the compositions shown in Table 1 which are the coating liquid 49 for forming an ink receiving layer on the optical disc D.

Next, as shown in FIG. 4 (f), the mask cap attaching / detaching means 29 is driven, and the mask cap 37 is detached from the optical disc D. As a result, a circular step 69 to which the coating liquid 49 is not applied is formed at the center of the optical disc D. Next, by driving the air cylinder 23, as shown in FIG. 4G, the suction table 13 is lowered to separate the optical disc D from the opening edge 25a of the mask plate 25 downward. As a result, the coating liquid 49 applied to the coating surface 57 is separated from the coating liquid 49 on the mask plate 25 by shearing. As a result, the outer peripheral edge of the optical disk D is covered with the mask plate 25, so that the non-application part 71 shown in FIG. 5 where the application liquid 49 is not applied is formed.
Note that the shape of the application part can be freely set by appropriately changing the opening shape of the mask plate 25.

  The optical disk D in which the application of the coating liquid 49 has been completed in this manner is omitted from the drawing table 13 and is transferred to the drying process of the coating liquid 49 in the next process, although not shown.

  In the blade coating apparatus 100 described above, the blade 51 is formed of a stainless material. However, the present invention is not limited to this, and may be, for example, a resin material or hard rubber. In this embodiment, the blade coating apparatus is used for coating the printing surface of the optical disc. However, the object is not limited to this, and any object that forms a thick film may be coated. Can do.

  The process of separating the optical disk D from the mask plate 25 will be described in detail. As shown in FIG. 4G, the optical liquid D is separated downward from the mask plate 25 and applied to the coating surface 57 and the mask. When the coating solution 49 on the plate 25 is separated by shearing, the coating solution 49 has a predetermined viscosity, so that the coating solution 49 is stretched in the separation direction (vertical direction in the drawing). As a result, a liquid film is temporarily formed along the opening edge 25a of the mask plate 25, and the mask plate 25 and the optical disc D are separated through a process of breaking the liquid film. When the grown liquid film spontaneously breaks down, the coating liquid may be scattered as droplets and may adhere to the coating liquid layer applied to the optical disc D and deteriorate the surface properties of the coating liquid layer. In order to prevent such a problem, it is important to destroy the liquid film at the initial stage of the liquid film generation before the liquid film grows greatly.

The liquid film breaking means will be specifically described below.
FIG. 6 is a vertical cross-sectional view of the main part showing each state of the process in which the optical disk is separated from the mask plate by the blade coating apparatus according to the first embodiment of the present invention, as shown in (a) to (d).
As shown in FIG. 6, the blade coating apparatus 100 of the first embodiment includes an inclined separation mechanism 71 that is an example of a liquid film breaking unit. The inclination separation mechanism 71 includes an elastic pressing member 73 and a pair of stoppers 75 (75A, 75B). The elastic pressing member 73 is for elastically pressing the mask plate 25 against the optical disc D when the optical disc D reaches the uppermost position, and is a machine frame above the mask plate 25 and outside the operating range of the blade 51. 77 is disposed on the lower surface. The elastic pressing member 73 has a coil spring 79 that can be elastically deformed in the vertical direction in the drawing. The stopper 75 includes a first stopper 75 </ b> A and a second stopper 75 </ b> B, and is fixed to the left and right side walls of the machine frame 77 so as to face each other. Further, the first stopper 75A is disposed above the second stopper 75B by a distance ΔH.

A coating liquid coating method using such a blade coating apparatus 100, particularly, a separation action between the mask plate 25 and the optical disk D will be described.
As shown in FIG. 6A, when the suction table 13 is raised by driving the air cylinder 23, the optical disk D comes into contact with the mask plate 25, and further rises while pushing up the mask plate 25. Eventually, the mask plate 25 is pressed by the elastic repulsive force from the coil spring 79 which is the elastic pressing member 73, and is stably positioned on the optical disk D. Here, the coating liquid 49 dropped onto the mask plate 25 by the coating liquid supply means 41 is applied to the coating surface 57 of the optical disc D by the blade 51 to form a coating liquid layer having a predetermined thickness.

  Next, as shown in FIG. 6B, when the suction table 13 is lowered, the mask plate 25 pressed downward by the elastic pressing member 73 is lowered together with the optical disk D, and the mask plate 25 is eventually moved to the first stopper. It contacts 75A. Thereby, the mask plate 25 is prevented from descending at the first stopper 75A side end. Further, when the optical disk D is lowered together with the suction table 13, as shown in FIG. 6C, the mask plate 25 is inclined and separation between the mask plate 25 and the optical disk D is started on the first stopper 75A side. The separation proceeds along the opening edge 25a of the mask plate 25 as the optical disk D descends, and eventually the second stopper 75B side end of the mask plate 25 comes into contact with the second stopper 75B, and the mask plate 25 Lowering is prevented. At this time, the coating liquid 49 applied to the separated portion (opening edge 25a) is stretched in the vertical direction to form a liquid film 49A. The liquid film 49A grows from the first stopper 75A side to the second stopper 75B side along the opening edge 25a of the mask plate 25 as the optical disk D is lowered.

  As the mask plate 25 is tilted, the liquid film 49A formed on the first stopper 75A side that is greatly stretched compared to the liquid film 49A in other portions is quickly and naturally destroyed. As a result, the liquid film 49A in the other part starts from this breaking point and breaks one after another before growing, and the optical disk D separates from the mask plate 4 as shown in FIG. 6 (d). Therefore, the generation of flying droplets of the coating liquid 49 accompanying the destruction of the liquid film 49A is prevented.

  The inclination of the mask plate 25 with respect to the optical disc D is the distance t between the mask plate 25 and the optical disc D at the opening edge 25a on the first stopper 75A side immediately before the optical disc D is separated from the mask plate 25 on the second stopper 75B side. 1 mm to 5 mm, particularly about 3 mm, was effective in destroying the liquid film 49A without generating flying droplets (see FIG. 6C).

  As described above, according to the blade coating apparatus 100 of the present embodiment, when the mask plate 25 and the optical disk D, which is a flat substrate, are separated, the gap between the opening edge 25a of the mask plate 25 and the optical disk D is set. Since the liquid film destruction means for destroying the generated liquid film 49A is provided, the liquid film 49A can be reliably broken at an arbitrary timing by the liquid film destruction means. In addition, this makes it possible to prevent the droplets generated when the liquid film 49A spontaneously breaks off from adhering to the optical disc D and form a coating liquid layer having a good surface property.

  Further, according to the blade coating apparatus 100 of the present embodiment, when the mask plate 25 and the optical disk D are separated from each other, the inclination separation mechanism 71 separates the mask plate 25 and the optical disk D while being inclined. Before the liquid film 49A generated between the mask plate 25 and the optical disk D grows, the liquid film 49A is broken at one point of the opening edge 25a of the mask plate 25, and the breakage is caused in the opening edge 25a. The liquid film 49A can be reliably broken by proceeding along the direction.

  That is, in the blade coating method of this embodiment, the mask 25 having the opening 27 is superposed on the optical disc D, the coating liquid 49 is supplied onto the mask 25, and the blade moves relative to the mask 25 above the mask 25. A blade coating method in which a coating liquid 49 is applied onto a mask 25 by 51 and then the mask 25 and the optical disk D are separated from each other to form a coating liquid layer corresponding to the opening 27 of the mask 25 on the optical disk D. Immediately after separating the optical disc 25 and the optical disc D, the liquid film 49A generated between the opening edge 25a of the mask 25 and the optical disc D is destroyed.

  The separation operation between the opening edge 25a of the mask 25 and the optical disc D is an operation for starting the separation at different timings depending on the position of the opening edge 25a.

(Second Embodiment)
FIG. 7 is a side view of an essential part of the blade coating apparatus according to the second embodiment of the present invention. In the following description, the same reference numerals are given to the same members as those of the blade coating apparatus 100 as the basic configuration, and the description thereof is omitted or simplified. As shown in FIG. 7, the blade coating apparatus 200 according to the second embodiment includes a liquid film breaking unit different from the above-described inclined separation mechanism 71.

  That is, a groove cam 81 that is a rotation conversion mechanism and a rotatable joint 83 are provided in the middle of the elevating shaft 21 that connects the air cylinder 23 and the suction table 13. The groove cam 81 has two spiral grooves 81a formed on the outer peripheral surface of the substantially cylindrical body. The lead of the spiral groove 81a is set to rotate 180 ° with respect to the axial length of the groove cam 81 of 50 mm. A cam follower at the tip of a pin 85 fixed to a machine frame (not shown) is fitted in the spiral groove 81a of the groove cam 81 fixed to the elevating shaft 21. Thereby, when the groove cam 81 moves linearly in the vertical direction, the groove cam 81, that is, the suction table 13 rotates.

  The rotatable universal joint 83 is a universal joint disposed on the lifting shaft 21 on the air cylinder 23 side of the groove cam 81, and the piston 87 and the lifting shaft 21 of the air cylinder 23 are rotatable and integrated in the axial direction. Connect to operate. Thus, when the air cylinder 23 is driven to move the piston 87 in the vertical direction, the suction table 13 is configured to rotate while moving up and down.

A separation action between the mask plate 25 and the optical disk D using the blade coating apparatus 200 will be described.
As shown in FIG. 7, after the coating liquid 49 is applied to the optical disk D, the air cylinder 23 is driven to move the piston 87 downward (in the direction of arrow C). It descends while rotating in the R direction. As a result, the coating liquid 49 applied to the mask plate 25 and the optical disk D is masked before the liquid film 49A grows because the portion along the opening edge 25a of the mask plate 25 is stretched simultaneously in the vertical direction and the rotational direction. The plate 25 and the optical disc D are destroyed at the initial separation stage.

  According to the blade coating apparatus 200 of the present embodiment, the generated liquid film 49A is stretched by the horizontal movement in addition to the vertical movement of the mask 25 and the flat substrate D, thereby extending the liquid film 49A. Film 49A can be destroyed early

(Third embodiment)
FIG. 8 is a plan view of an essential part of a blade coating apparatus according to a third embodiment of the present invention, and FIG. 9 is a longitudinal sectional view of the essential part of the blade coating apparatus shown in FIG.
As shown in FIGS. 8 and 9, in the blade coating apparatus 300 of the third embodiment, a liquid film breaking means 91 is disposed below the mask plate 25. The liquid film breaking means 91 includes an electric motor 95 and a rotating arm 93 that is a liquid film breaking member fixed to the rotating shaft 97 of the electric motor 95. When the optical disk D is slightly lowered from the mask plate 25, the electric motor 95 is driven so that the rotary arm 93 is inserted into the gap formed between the mask plate 25 and the optical disk D from the outside of the opening 27 of the mask 25. Projecting into contact with the liquid film 49A. As a result, the liquid film 49A formed between the mask plate 25 and the optical disk D is forcibly destroyed.

  According to the blade coating apparatus 300 of this embodiment, when the mask 25 and the flat substrate (optical disk) D are separated from each other, the liquid film breaking member (rotating arm) 93 is protruded inside the opening 27 of the mask 25. Since the liquid film 49A is brought into contact with the liquid film 49A, the liquid film 49A can be reliably destroyed before the liquid film 49A grows.

  The member for breaking the liquid film is not limited to a member that breaks the mechanical part by contacting the liquid film 49A such as a rotating arm. For example, a liquid film is ejected toward the liquid film 49A by ejecting a fluid such as air. 49A may be destroyed.

(Fourth embodiment)
FIG. 10 is a plan view of a mask plate used in the blade coating apparatus according to the fourth embodiment of the present invention.
As shown in FIG. 10, the mask plate 25 of the blade coating apparatus 400 of the fourth embodiment is provided with cutouts 25b and 25b formed by cutting a part of the opening edge 25a into a substantially V shape. . When the coating liquid 49 is applied to the optical disc D using such a mask plate 25 and then the mask plate 25 and the optical disc D are separated from each other, the liquid film 49A formed in the vicinity of the notches 25b and 25b has other parts ( That is, it is greatly stretched compared with the liquid film 49A in the arc portion) to cause imbalance, and breakage occurs from the liquid film 49A applied in the vicinity of the notches 25b and 25b. The destruction proceeds along the opening edge 25a of the mask plate 25 and can be destroyed before the liquid film 49A grows.

  According to the blade coating apparatus 400 of the present embodiment, the notches 25b and 25b are formed in at least one position of the opening edge 25a of the mask 25. Therefore, when the mask 25 and the optical disc D are separated, the notches 25b and 25b The liquid film 49A is broken from 25b, and the liquid film 49A can be broken at an early stage. In addition, the notches 25b and 25b are not limited to two, and an arbitrary number can be provided. Moreover, not only a notch but a protrusion may be sufficient.

(Fifth embodiment)
FIG. 11 is an enlarged perspective view of a main part of a mask plate used in the blade coating apparatus according to the fifth embodiment of the present invention.
As shown in FIG. 11, the mask plate 25 used in the blade coating apparatus 500 according to the fifth embodiment is made of a material having low wettability at most of the opening edge 25 a that defines the opening 27, for example, a fluorine resin. As a result, a coating portion 25c having low wettability is formed on the application portion. The remaining portion of the opening edge portion 25a is not coated with a fluorine-based resin, in other words, an uncoated portion 25d having high wettability is formed. Accordingly, the wettability discontinuous portion 25e is formed at the boundary between the coating portion 25c and the non-coating portion 25d having different wettability.

  When the coating liquid 49 is applied to the optical disc D using such a mask plate 25 and then the mask plate 25 and the optical disc D are separated, the liquid film 49A formed between the mask plate 25 and the optical disc D is Breakage occurs due to imbalance occurring in the wettability discontinuity 25e, and the breakage proceeds along the opening edge 25a of the mask plate 25, and can be broken before the liquid film 49A grows.

  According to the blade coating apparatus 500 of the present embodiment, since the wettability discontinuous portion 25e having wettability different from the surroundings is formed at least at one position of the opening edge portion 25a of the mask 25, before the liquid film 49A grows. The liquid film 49A is broken by the wettability discontinuous portion 25e, whereby the liquid film 49A can be reliably broken.

  Note that the blade coating apparatus according to the present invention described above is not limited to the configuration of each of the embodiments described above, and can be appropriately modified and improved.

1 is a configuration diagram illustrating a schematic basic configuration of a blade coating apparatus according to the present invention. It is the perspective view showing the outline of the external appearance of the blade coating device shown in FIG. It is explanatory drawing which represented the basic procedure of the blade application | coating method which concerns on this invention with (a)-(c). It is explanatory drawing which represented the basic procedure of the blade coating method which concerns on this invention with (d)-(g). It is a top view of the to-be-coated member which application was completed. It is the principal part longitudinal cross-sectional view which represented each state of the process in which the optical disk leaves | separates from a mask board with the blade coating device of 1st Embodiment by (a)-(d). It is a principal part side view of the braid | blade coating device of 2nd Embodiment. It is a principal part top view of the blade coating device of 3rd Embodiment. It is a principal part longitudinal cross-sectional view of the blade coating device shown in FIG. It is a top view of the mask board used for the blade coating apparatus of 4th Embodiment. It is a principal part fracture perspective view of the mask board used for the blade coating device of 5th Embodiment. A state in which a coating liquid is applied by a conventional disk coating apparatus is shown, (a) is a perspective view showing a state in which the coating liquid is applied to the optical disk by a blade, and (b) is a perspective view showing a state in which the optical disk is separated from the mask plate. FIG. It is explanatory drawing of the prior art which represented each state of the process in which an optical disk leaves | separates from a mask board with (a)-(d).

Explanation of symbols

23 Air cylinder (mask stripping means)
25 Mask plate (mask)
25a Opening edge 25b Notch 25e Wetting discontinuity 27 Opening 41 Application liquid supply part 49 Application liquid (application liquid layer)
49A Liquid film 51 Blade 71 Inclination separation mechanism (liquid film breaking means)
81 groove cam (rotation conversion mechanism)
91 Liquid film breaking means 93 Rotating arm (Liquid film breaking member)
100, 200, 300, 400, 500 Blade coating device D Optical disk (planar substrate)

Claims (11)

A mask having an opening is superposed on a flat substrate, a coating liquid is supplied onto the mask, and the coating liquid is coated on the mask by a blade that moves relative to the mask above the mask, and then the mask. And a blade coating method of forming a coating liquid layer corresponding to the opening of the mask on the planar substrate,
Immediately after separating the mask and the planar substrate, a blade coating method destroys a liquid film formed between the opening edge of the mask and the planar substrate.   2. The separation operation according to claim 1, wherein the separation operation is an operation for starting the separation operation between the opening edge portion of the mask and the planar substrate at a different timing depending on the position of the opening edge portion. Blade application method.   The separation operation includes a horizontal movement in addition to a vertical movement between the mask and the planar substrate as a separation operation between the opening edge of the mask and the planar substrate. The blade coating method according to claim 1 or 2.   The blade coating method according to claim 1, wherein a liquid film breaking member is brought into contact with the liquid film during the separation operation. A mask having an opening;
A coating liquid supply unit for supplying a coating liquid onto the mask superimposed on a flat substrate;
A blade that moves relative to the mask above the mask;
A mask coating device comprising: a mask peeling means for separating the mask and the planar substrate after coating the coating liquid on the mask,
When the mask and the flat substrate are separated from each other by the mask peeling means, a liquid film breaking means for breaking a liquid film generated between the opening edge of the mask and the flat substrate is provided. Blade coating device.   The liquid film breaking means includes an inclination separation mechanism that separates the mask and the planar substrate in a state of being inclined with respect to each other when the mask peeling means separates the mask and the planar substrate. 6. The blade coating apparatus according to claim 5, wherein the flat substrate is separated from the flat substrate in an inclined state.   The liquid film breaking means includes a rotation conversion mechanism that converts a linear motion of the mask peeling means into a rotational movement when the mask peeling means separates the mask and the flat substrate, and the mask and the flat substrate The blade coating apparatus according to claim 5, wherein the blade coating device is separated while being relatively rotated.   The liquid film breaking means includes a liquid film breaking member disposed so as to protrude inward from the outside of the mask opening, and the liquid film breaking member is masked when the mask and the planar substrate are separated from each other. 6. The blade coating apparatus according to claim 5, wherein the blade coating apparatus projects inward of the opening and contacts the liquid film.   6. The blade coating apparatus according to claim 5, wherein the liquid film breaking means includes a notch formed in at least one position of the opening edge of the mask.   6. The blade coating apparatus according to claim 5, wherein the liquid film breaking means includes a wettability discontinuity portion having a wettability different from a periphery formed at at least one position of an opening edge portion of the mask.   A disk coating method comprising forming at least one layer of a printing surface of a disk-shaped recording medium by the blade coating method according to claim 1.

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