JP2004243575A - Printing plate and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing plate capable of improving the control precision of a discharge amount of a printing medium and reducing its abrasion. <P>SOLUTION: In this printing plate, openings 11 of a sectional shape having the so-called constricted part, are configured in a matrix pattern at a specified position of a metal sheet 10 such as an SUS plate or a nickel plate. That is, the sectional shape indicates a larger open area S1 of the printing surface side than the open area S2 of the squeegee surface side and a smaller open area S3 near the center part in a plate thickness direction than the open area S2 of the squeegee surface side. Thus, it is possible to precisely control the discharge amount of a printing medium to be discharged from the squeegee surface to the printing surface by properly adjusting three parameters such as the open area S1 of the printing surface side, the open area S2 of the squeegee surface side and the open area S3 near the center part in the plate thickness direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a printing plate and a printing method, and more particularly to a printing plate and a printing method suitable for transferring a printing medium into a space surrounded by a partition wall such as a plasma display panel (PDP).
[0002]
[Prior art]
The PDP is a glass front substrate formed with a pair of surface discharge display electrodes extending in parallel with the row direction of the display screen, a dielectric layer for AC driving, and a protective film such as MgO; A number of parallel or lattice-shaped partition walls in the column direction, a data electrode made of a metal such as Cr, Cu, or Ag on the substrate surface between the partition walls, and a glass back substrate formed with a phosphor layer covering the data electrodes; Are arranged to face each other, and after sealing the periphery, a space surrounded by partition walls (hereinafter referred to as a discharge cell) is filled with a discharge gas to form a self-luminous thin display in which a discharge cell array is formed inside the panel. It is a panel.
[0003]
As a method of forming a phosphor layer in a discharge cell surrounded by partition walls, a method by screen printing is generally used, and a desired pattern is formed on a photosensitive resin (emulsion) coated on a metal mesh. Then, the squeegee is squeezed (squeezed) through a printing plate from which the emulsion from which the phosphor paste is to be discharged is transferred to the discharge cells, and then the solvent of the phosphor paste is dried. To form a desired shape. Further, there has been proposed a method of controlling a discharge amount of a phosphor paste based on a composition condition of the phosphor paste and a printing condition (squeegee setting angle) at the time of printing (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-5-299019
[0005]
[Problems to be solved by the invention]
However, when it is difficult to arbitrarily select the plate thickness of the printing plate industrially such as a metal plate, for example, the area of the opening (hereinafter referred to as the opening area) and the paste are unavoidably determined according to the selected plate thickness. The ejection amount of the print medium (for example, phosphor paste) has been adjusted by appropriately adjusting the viscosity and the like. That is, the discharge amount is increased by increasing the opening area, and the discharge amount is decreased by decreasing the opening area. Conversely, when there is a restriction on the shape of the opening on the printing surface side, it is possible to adjust the discharge amount to some extent by adjusting the plate thickness. There is a problem that it is difficult to select an optimal plate thickness from the viewpoint of the rigidity of the sheet.
[0006]
In addition, when the print medium is ejected from the openings by placing the print medium on the printing plate and sliding the squeegee, it is difficult to eject a uniform amount of the print medium from all the openings, In some cases, the print medium is not ejected from the opening, and there is a problem that a missing portion where the print medium is not transferred to the print target occurs.
[0007]
Further, when the printing plate comes into contact with the printing material, the printing plate may damage the printing material. For example, when the phosphor paste is transferred to the back substrate of the PDP, the partition provided on the substrate and the printing plate may be damaged. When the substrate comes into contact with the substrate, there is a problem that the substrate is damaged and lost, thereby lowering the production yield.
[0008]
Further, since the squeegee slides on the printing plate to discharge the printing medium on the squeegee surface side to the printing surface side, there is a problem that every time the squeegee is slid, contact friction occurs and the printing plate is worn. . In particular, when metal is used as the main material of the printing plate, the contact friction with the squeegee tends to increase, and there has been a problem that the life of the printing plate is shortened due to wear.
[0009]
The present invention has been made in view of such circumstances, and has an opening area on the printing surface side larger than the opening area on the squeegee surface side, and an opening area at the center in the plate thickness direction is smaller than the opening area on the squeegee surface side. It is an object of the present invention to provide a printing plate having improved control accuracy of the discharge amount of a printing medium by having the printing plate.
[0010]
Further, according to the present invention, by providing a groove connecting the openings on the squeegee surface side, a rotational motion (rolling) is generated along the groove on the printing medium which is a viscous fluid such as a phosphor paste, and the rotating direction is obtained. In addition to promoting the flow, the internal pressure at the opening is increased to promote the ejection of the printing medium from the printing surface side, and the variation in the ejection amount of the printing medium ejected from the opening is suppressed. An object of the present invention is to provide a printing plate capable of reducing missing portions where a printing medium is not transferred.
[0011]
Further, according to the present invention, by making the shape of the opening narrower in the traveling direction in which the squeegee slides, the ejection amount of the print medium discharged from the region on the upstream side in the traveling direction of the squeegee in the opening, Provided is a printing plate capable of improving the accuracy of the transfer position of a print medium to a printing material and the transfer rate to the printing material by increasing the discharge amount of the printing medium discharged from a region downstream of the squeegee in the traveling direction. With the goal.
[0012]
Further, the present invention, by having a resin layer on the surface on the printing surface side, while reducing the damage to the printing substrate as a resin layer as a buffer material, by having a fluororesin layer on the squeegee surface side surface, An object of the present invention is to provide a printing plate in which a friction coefficient of contact friction generated by a squeegee sliding on the printing plate is reduced and wear resistance is improved.
[0013]
Further, the present invention reduces the friction coefficient between the printing plate and the squeegee when the squeegee is slid by discharging the printing medium using a squeegee having a fluororesin layer on the surface, and reduces wear of the printing plate. The purpose of the present invention is to provide a printing method that can perform the printing.
[0014]
[Means for Solving the Problems]
In the printing plate according to the first invention, the opening area on the printing surface side in the opening penetrating between the printing surface facing the printing object and the squeegee surface on which the squeegee slides is larger than the opening area on the squeegee surface side. The opening area at the center in the plate thickness direction has a cross-sectional shape smaller than the opening area on the squeegee surface side.
[0015]
In such a printing plate, the opening area on the printing surface side is larger than the opening area on the squeegee surface side, and the opening area at the center in the plate thickness direction has a cross-sectional shape smaller than the opening area on the squeegee surface side, The three parameters of the opening area on the printing surface side, the opening area on the squeegee surface side, and the opening area at the center in the plate thickness direction are appropriately adjusted, and the ejection amount is accurately controlled. In addition, since the probability that the paste once filled in the discharge cells will reattach to the printing plate side can be reduced, there is also an advantage that the transfer probability is improved.
[0016]
The printing plate according to the second invention is characterized in that the squeegee surface side has a groove that connects between a plurality of openings penetrating between a printing surface facing the printing material and a squeegee surface on which the squeegee is slid. I do.
[0017]
In such a printing plate, by having a groove connecting the openings on the squeegee surface side, a rotational motion is generated in the printing medium as a viscous fluid such as a phosphor paste along the groove, and the rotation is caused. In the opening direction, the internal pressure in the opening is increased to promote the ejection of the printing medium from the printing surface side, and the variation in the ejection amount of the printing medium ejected from the opening is suppressed. The missing portion where the print medium is not transferred to the printed matter is reduced.
[0018]
The printing plate according to a third invention is characterized in that, in the first invention or the second invention, the printing plate has a shape that becomes narrower in a traveling direction in which the squeegee is slid.
[0019]
In such a printing plate, the shape of the opening is narrowed in the traveling direction in which the squeegee slides, so that the printing medium discharged from the upstream area in the traveling direction of the squeegee in the opening. Is made larger than the discharge amount of the print medium discharged from the region on the downstream side in the traveling direction of the squeegee. Therefore, the printing medium is more likely to be transferred from the upstream region of the squeegee in the advancing direction of the squeegee to the printing material, and the transfer position to the printing material is smaller than that of a conventional printing plate having an opening having an isotropic shape. The accuracy of is improved. In addition, since the print medium flowing in the opening is easily concentrated on the region on the upstream side in the traveling direction of the squeegee, the print medium is easily dropped on the printing material in a short time, and the dropped print medium pulls the print medium due to its viscosity. Because of the action, the transfer rate to the printing substrate is improved.
[0020]
A printing plate according to a fourth invention is the printing plate according to any one of the first invention to the third invention, wherein the printing plate has a resin layer on the surface on the printing surface side and a fluororesin layer on the surface on the squeegee surface side. And
[0021]
In such a printing plate, by providing the resin layer on the surface on the printing surface side, the resin layer serves as a buffering material to reduce damage to a printed material, and the fluororesin layer is formed on the surface on the squeegee surface side. , The coefficient of contact friction caused by the squeegee sliding on the printing plate is reduced to improve the wear resistance of the printing plate. Further, the thickness of the printing plate is adjusted by adjusting the film thickness of the resin layer and / or the fluororesin layer according to the manufacturing conditions, and the discharge amount of the printing medium is adjusted. Accordingly, the degree of freedom in setting the discharge amount is widened, and restrictions required for the shape of the opening are reduced.
[0022]
The printing method according to a fifth aspect of the present invention is the printing method, wherein the printing medium is printed from the squeegee surface side through a printing plate having an opening penetrating between the printing surface facing the printing material and the squeegee surface on which the squeegee is slid. In a printing method in which the printing medium is ejected to a surface side and transferred to the printing material, the printing medium is ejected using a squeegee having a fluororesin layer on the surface.
[0023]
In such a printing method, by discharging the printing medium using a squeegee having a fluororesin layer on the surface, the friction coefficient between the printing plate and the squeegee when the squeegee is slid is reduced, and printing is performed. Reduce plate wear.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments. In the following embodiments, a form in which a phosphor paste is transferred as a print medium in a discharge cell surrounded by partition walls will be described using a back substrate of a PDP as an example of a print object. However, is not limited to this.
[0025]
(Embodiment 1)
FIG. 1 is a perspective view showing the appearance of a printing plate according to the present invention. In the drawing, reference numeral 1 denotes a printing plate, which includes a metal plate 10 provided with an opening 11, a metal mesh 5 supporting four sides of the metal plate 10, and a frame 6 supporting the metal mesh 5. ing.
[0026]
FIG. 2 is a three-sided view of the metal plate used for the printing plate according to the first embodiment of the present invention. FIG. 2A is a plan view (hereinafter, a top view) viewed from a squeegee surface, and FIG. A plan view (hereinafter, a bottom view) as viewed from a plane, and FIG. 3C is a cross-sectional view taken along line cc of the top view. For example, a metal plate 10 such as a SUS plate or a nickel plate is provided with an opening 11 at a predetermined position, and the opening 11 is, for example, in the case of a printing plate for forming a phosphor on a back substrate of a PDP. , In a matrix (for example, at a pitch of 300 μm). In the opening 11, as shown in FIG. 3C, the opening area S1 on the printing surface side is larger than the opening area S2 on the squeegee surface side, and the opening area S3 near the center in the thickness direction is the squeegee surface. Smaller than the opening area S2 on the side (S1>S2> S3). More specifically, the thickness of the metal plate 10 is defined as L, the squeegee surface is defined as the coordinate origin (Y = 0) of the position Y, and the thickness direction from the squeegee surface to the printing surface is defined as the positive direction of the position Y. Assuming that the opening area of the opening at the position Y of the plate 10 is S (Y), in the region of Y1 <Y2 ≦ L / 2, the relationship of S (Y1)> S (Y2) is satisfied, and L / 2 ≦ Y1 In the region of <Y2, the relationship of S (Y1) <S (Y2) is satisfied, and the relationship of S (0) <S (L) is satisfied. The opening area S1 is S (L), the opening area S2 is S (0), and the opening area S3 is S (L / 2).
[0027]
The metal plate 10 having such a shape has three parameters: an opening area S1 on the printing surface side, an opening area S2 on the squeegee surface side, and an opening area S3 near the center in the thickness direction. Therefore, in the manufacturing method described later, the discharge amount of the print medium can be controlled more accurately by appropriately adjusting the three parameters, the opening areas S1, S2, and S3.
[0028]
For example, the opening area S1 on the printing surface side of the opening 11 is limited by the alignment accuracy between the metal plate 10 and the printing medium, but the opening area S2 on the squeegee surface side and the opening area S3 near the center in the plate thickness direction. By adjusting the above, the ejection amount of the print medium can be controlled without adjusting the thickness of the metal plate 10. In addition, since the probability that the paste once filled in the discharge cells will reattach to the printing plate side can be reduced, there is also an advantage that the transfer probability is improved.
[0029]
Further, since the angle φ of the edge portion of the opening 11 on the squeegee surface is obtuse (φ> 90 °), when the squeegee is slid, the friction between the squeegee and the edge of the opening 11 is increased. Since the coefficient can be reduced, abrasion between the squeegee and the edge portion of the opening 11 can be reduced.
[0030]
Next, a method for manufacturing the metal plate 10 having such a shape will be described. FIG. 3 is an explanatory view showing a method for manufacturing a metal plate used for a printing plate according to the present invention. A metal flat plate 30 having a predetermined thickness is prepared, and a photosensitive resin (resist) 21 having photo-curing properties that is not dissolved in a developing solution due to a photopolymerization reaction when exposed (exposed) to ultraviolet rays on both surfaces of the flat plate 30. Is applied, the applied photosensitive resin 21 is dried in an oven (FIG. 3A).
[0031]
Then, the lower surface of the flat plate 30 is exposed to ultraviolet rays via a photomask 50a provided with a pattern 51a to be the opening 11 on the printing surface side (FIG. 3B). Similarly, the upper surface of the flat plate 30 is exposed to ultraviolet light via a photomask 50b provided with a pattern 51b serving as the opening 11 on the squeegee surface side (FIG. 3C). Here, the photomasks 50a and 50b have different areas (diameters R1 and R2) arranged as the patterns 51a and 51b, and the area (diameter R1) of the pattern 51a is larger than the area (diameter R2) of the pattern 51b. Use things.
[0032]
Next, a developing solution is sprayed on the upper and lower surfaces of the flat plate 30 to remove the unexposed portions of the photosensitive resin 21 on the upper and lower surfaces, thereby forming a resist pattern (FIG. 3D). ). Then, the flat plate 30 having the resist pattern formed on both surfaces was wet-etched hemispherically from the upper surface and the lower surface to form the metal plate 10 having the opening 11 (FIG. 3E). The photosensitive resin 21 as a resist is peeled off (FIG. 3F). Here, the wet etching is performed because the opening area S1 on the lower surface side is larger than the opening area S2 on the upper surface side by utilizing the etching isotropy, which is the greatest advantage, and the opening in the vicinity of the central portion in the plate thickness direction. This is for forming a cross-sectional shape having the area S3 smaller than the opening area S2 on the upper surface side.
[0033]
According to such a manufacturing method, the metal formed from the three parameters of the opening area S1 on the lower surface (printing surface) side, the opening area S2 on the upper surface (squeegee surface) side, and the opening area S3 near the center in the plate thickness direction. The plate 10 can be manufactured, and by appropriately setting the pattern areas (diameters R1 and R2) and the etching time of the photomasks 50a and 50b, the three opening areas S1, S2 and S3 are adjusted to discharge. Control the amount. Needless to say, in FIG. 3E, in addition to wet etching, which is characterized by isotropic properties, by using dry etching, which is characterized by anisotropic (straight-forward) etching, the side walls (side surfaces) formed by etching are used. The shape of the wall may be adjusted.
[0034]
As the photosensitive resin 21, a material having a property of decomposing and dissolving in a developer when exposed to ultraviolet light may be used. In this case, a mask having a pattern in which the opening 11 is cut out as a photomask is used. It may be used.
[0035]
In addition, the description has been given of the embodiment in which the flat plate 30 is simultaneously etched from the upper surface and the lower surface to process (manufacture) the metal plate 10 having the opening 11. First, the etching is performed from either the upper surface or the lower surface, and then, The etching may be performed from the other surface. In this case, the position of the opening area S3 can be adjusted by changing each etching time.
[0036]
Further, a resist pattern is formed by applying, drying (FIG. 3A), exposing (FIGS. 3B and 3C), and developing (FIG. 3D) the photosensitive resin 21. However, the photosensitive resin film in which the pattern for forming the opening 11 is arranged in advance may be attached to the flat plate 30 and the photosensitive resin film may be used as a resist. Needless to say, as a method of forming the metal plate 10 having the opening 11, in addition to the above-described etching method, a laser processing method, an electroforming method, or the like known per se may be used.
[0037]
FIG. 4 is an explanatory diagram for explaining the printing method according to the present invention. The back substrate of the PDP to be printed includes a substrate body 91 made of glass, a grid-like partition 92 serving as a display unit of a display screen, and a data electrode 93 provided on the bottom surface of a discharge cell 92a surrounded by the partition 92. It consists of.
[0038]
At the time of printing, the phosphor paste 82 is placed on the squeegee surface (the upper surface in the figure), and the squeegee 83 in which the surface of the hard rubber 83a is coated with a fluororesin 83b such as Teflon (registered trademark) is slid in the traveling direction X. As a result, the phosphor paste 82 is discharged from the squeegee surface to the printing surface (the lower surface in the same drawing) through the opening 11 into the corresponding discharge cell 92a to form a phosphor layer covering the data electrode 93 and the side wall of the partition wall 92. Let it. Therefore, since the surface of the squeegee 83 is coated with the fluororesin 83b having a low coefficient of friction, the coefficient of friction between the printing plate 1 (metal plate 10) and the squeegee 83 is reduced, and the wear resistance of the printing plate 1 can be improved.
[0039]
Hereinafter, other embodiments of the printing plate according to the present invention will be described. However, since any manufacturing method and a printing method using the printing plate of each embodiment are the same as those of the first embodiment, the printing plate Only the configuration will be described.
[0040]
(Embodiment 2)
FIG. 5 is a three-sided view of a metal plate used for a printing plate according to Embodiment 2 of the present invention. FIG. 5A is a plan view (hereinafter, a top view) as viewed from a squeegee surface, and FIG. FIG. 2C is a cross-sectional view taken along line cc of the top view, and FIG. 2D is a cross-sectional view taken along line dd of the top view. For example, a metal plate 10 such as a SUS plate or a nickel plate is provided with an opening 11 at a predetermined position, and the opening 11 is, for example, in the case of a printing plate for forming a phosphor on a back substrate of a PDP. , In a matrix (for example, at a pitch of 300 μm). In the opening 11, as shown in FIG. 3C, the opening area S1 on the printing surface side is larger than the opening area S2 on the squeegee surface side, and the opening area S3 near the center in the thickness direction is the squeegee surface. Smaller than the opening area S2 on the side (S1>S2> S3). Then, as shown in FIG. 4D, adjacent openings 11 are connected by providing a groove 20 shallower than the thickness of the metal plate 10 on the squeegee surface side. In order to form such a groove 20 in the metal plate 10, the photomask 50 a used in the above-described manufacturing method may have a pattern of the groove 20 in addition to the pattern of the opening 11.
[0041]
The metal plate 10 having such a shape promotes the discharge of the phosphor paste 82 from the opening 11 by the groove 20. That is, since the flow direction of the print medium, which is a viscous fluid such as the phosphor paste 82, is determined by causing rotational movement through mechanical contact, the flow of the print medium is controlled by forming the groove 20 in the longitudinal direction of the groove 20. At the same time, the internal pressure in the opening 11 is increased, and the ejection of the printing medium from the printing surface side is promoted.
[0042]
(Embodiment 3)
FIG. 6 is a three-sided view of a metal plate used for a printing plate according to Embodiment 3 of the present invention. FIG. 6A is a plan view (hereinafter, a top view) as viewed from a squeegee surface, and FIG. A plan view (hereinafter, a bottom view) as viewed from a plane, and FIG. 3C is a cross-sectional view taken along line cc of the top view. For example, a metal plate 10 such as a SUS plate or a nickel plate is provided with an opening 11 at a predetermined position, and the opening 11 is, for example, in the case of a printing plate for forming a phosphor on a back substrate of a PDP. , In a matrix (for example, at a pitch of 300 μm). In the opening 11, as shown in FIG. 3C, the opening area S1 on the printing surface side is larger than the opening area S2 on the squeegee surface side, and the opening area S3 near the center in the thickness direction is the squeegee surface. Smaller than the opening area S2 on the side (S1>S2> S3). Each of the openings 11 has a shape narrowing in the traveling direction X of the squeegee 83.
[0043]
In the opening 11 of the metal plate 10 having such a shape, the discharge amount of the phosphor paste 82 discharged from the upstream region in the traveling direction X of the squeegee 83 is reduced in the downstream region in the traveling direction X of the squeegee 83. Since the discharge amount is larger than the discharge amount discharged from the squeegee 83, the transfer is easily performed first from the area on the bottom surface of the discharge cell 92a on the upstream side in the traveling direction X of the squeegee 83. Therefore, the accuracy of the transfer position to the discharge cells 92a is improved as compared with a metal plate having an isotropically shaped (for example, circular) opening. Further, the phosphor paste 82 flowing in the opening 11 tends to concentrate on the upstream region in the traveling direction X of the squeegee 83, and easily falls on the bottom surface of the discharge cell 92a due to its own weight. Since the 82 acts to pull the phosphor paste 82 due to its viscosity, the transfer rate to the discharge cells 92a is improved.
[0044]
(Embodiment 4)
FIG. 7 is a three-view drawing of a metal plate used for a printing plate according to Embodiment 4 of the present invention. FIG. 7A is a plan view (hereinafter, a top view) viewed from a squeegee surface, and FIG. A plan view (hereinafter, a bottom view) as viewed from a plane, and FIG. 3C is a cross-sectional view taken along line cc of the top view. For example, a metal plate 10 such as a SUS plate or a nickel plate is provided with an opening 11 at a predetermined position, and the opening 11 is, for example, in the case of a printing plate for forming a phosphor on a back substrate of a PDP. , In a matrix (for example, at a pitch of 300 μm). In the opening 11, as shown in FIG. 3C, the opening area S1 on the printing surface side is larger than the opening area S2 on the squeegee surface side, and the opening area S3 near the center in the thickness direction is the squeegee surface. Smaller than the opening area S2 on the side (S1>S2> S3). Then, a resin layer 12 is formed on the printing surface side of the metal plate 10, while a fluororesin layer 13 such as Teflon is formed on the squeegee surface side.
[0045]
As described above, the printing plate 1 in which the resin layer 12 is formed on the printing surface side of the metal plate 10 and the fluororesin layer 13 is formed on the squeegee surface side, the resin layer 12 serves as a cushioning material, and And the fluororesin layer 13 reduces the coefficient of contact friction with the squeegee 83 sliding thereon, thereby improving the wear resistance of the printing plate 1. Further, by adjusting the thicknesses of the resin layer 12 and the fluororesin layer 13, the thickness of the printing plate 1 can be adjusted, and the degree of freedom in setting the discharge amount of the printing medium can be improved. In particular, at the time of printing, as in FIG. 4, by using the squeegee 83 in which the surface of the hard rubber 83a is coated with the fluororesin 83b, both the printing plate 1 and the contact surface of the squeegee 83 become fluororesin. The friction coefficient between the printing plate 1 and the squeegee 83 is further reduced, and the wear resistance of the printing plate 1 can be further improved.
[0046]
Next, a method of forming the resin layer 12 on one surface of the metal plate 10 and forming the fluororesin layer 13 on the other surface will be described. A resin is spray-coated on one surface of the metal plate 10 in which the opening 11 is formed, and the applied resin is fired in an oven. Next, the metal plate 10 is exposed to ultraviolet rays through a photomask provided with a pattern 51a to be the opening 11 on the printing surface side. Then, the resin layer 12 is formed by spraying a developing solution onto the metal plate 10 to remove the resin in the unexposed portion. On the other hand, on the other surface, a fluororesin layer 13 is formed by the same method.
[0047]
As another method, as shown in FIG. 3, as shown in FIG. 3E, the opening 11 is formed in the flat plate 30 to form the metal plate 10, and the photosensitive resin as a resist formed on both surfaces of the metal plate 10 is formed. Instead of peeling off the photosensitive resin 21 (FIG. 3F), the photosensitive resin 21 formed on the upper surface may be peeled off, and the photosensitive resin 21 formed on the lower surface may be left. In this way, the photosensitive resin 21 left on the lower surface functions as the resin layer 12 and also reduces the number of manufacturing steps.
[0048]
FIG. 8 shows another example of the fourth embodiment. FIG. 8 is a three-view drawing of a metal plate used for another printing plate according to Embodiment 4 of the present invention. FIG. 8A is a plan view (hereinafter, a top view) viewed from a squeegee surface, and FIG. Is a plan view (hereinafter referred to as a bottom view) as viewed from the printing surface, and FIG. 3C is a cross-sectional view taken along line cc of the top view. After the resin is applied to the entire surface of the metal plate 10, the resin layer 12 is formed by firing, and then the fluororesin layer 13 is formed on the resin layer 12 on the squeegee surface side. After applying the fluororesin to the entire surface and baking to form the fluororesin layer 13, the resin layer 12 may be formed on the fluororesin layer 13 on the printing surface side.
[0049]
In each of the embodiments, the form in which the phosphor paste 82 is transferred as the print medium in the discharge cells 92a surrounded by the partition walls 92 has been described by taking the back substrate of the PDP as an example of the print target. The printing medium and the printing medium are not limited, for example, the form in which the resistor paste and the solder paste are transferred as the printing medium to the surface of the printed wiring board to form the resistance and the solder bumps.
[0050]
Further, during printing, frictional heat is generated due to the contact between the printing plate 1 and the squeegee 83, and the metal plate 10 expands, so that the opening 11 provided in the metal plate 10 and the discharge cells 92a, which are printing materials, are in contact with each other. As the printing position accuracy decreases, the opening area of the opening 11 changes. Therefore, it is preferable to use a low expansion metal such as an invar material as the metal plate 10 so that the expansion of the metal plate 10 is reduced and the printing position accuracy and the opening area are hardly changed. In particular, this effect is great when printing on a large area substrate such as a large PDP. By using a low expansion metal, it is possible to suppress a change in printing position accuracy and an opening area to improve a manufacturing yield. Can be.
[0051]
In addition, the form in which the metal plate 10 such as a SUS plate and a nickel plate is used as the plate having the opening 11 used for the printing plate 1 has been described, but the present invention is not limited to this, and a plastic plate such as an acrylic plate and a polycarbonate plate is used. It may be.
[0052]
【The invention's effect】
As described in detail above, according to the present invention, the opening area on the printing surface side is larger than the opening area on the squeegee surface side, and the opening area at the center in the thickness direction is smaller than the opening area on the squeegee surface side. By appropriately adjusting three parameters of the opening area on the printing surface side, the opening area on the squeegee surface side, and the opening area in the center in the thickness direction, the accuracy of the ejection amount can be improved.
[0053]
Further, according to the present invention, by providing a groove connecting the openings on the squeegee surface side, a rotational motion is generated in the printing medium which is a viscous fluid such as a phosphor paste along the groove, and the rotational direction is changed in the rotating direction. In addition to promoting the flow, the internal pressure at the opening is increased to promote the ejection of the printing medium from the printing surface side, and the variation in the ejection amount of the printing medium ejected from the opening is suppressed. Missing portions where the medium is not transferred can be reduced.
[0054]
Further, according to the present invention, by making the shape of the opening narrower in the traveling direction of the squeegee, the discharge amount of the print medium discharged from the upstream area in the traveling direction of the squeegee in the opening. Can be made larger than the discharge amount of the print medium discharged from the region on the downstream side in the traveling direction of the squeegee. Therefore, the printing medium is more likely to be transferred from the upstream region of the squeegee in the advancing direction of the squeegee to the printing material, and the transfer position to the printing material is smaller than that of a conventional printing plate having an opening having an isotropic shape. Accuracy can be improved. In addition, since the printing medium flowing in the opening is easily concentrated on the upstream area in the traveling direction of the squeegee, the printing medium easily falls on the printing material in a short time, and the dropped printing medium acts to pull the printing medium due to its viscosity. Therefore, the transfer rate to the printing substrate can be improved.
[0055]
Further, according to the present invention, by having the resin layer on the surface on the printing surface side, the resin layer serves as a cushioning material to reduce damage to a printed material, and has the fluororesin layer on the surface on the squeegee surface side. Thereby, the coefficient of contact friction generated by the squeegee sliding on the printing plate can be reduced, and the wear resistance of the printing plate can be improved. Further, by adjusting the thickness of the resin layer and / or the fluororesin layer according to the manufacturing conditions, the thickness of the printing plate can be adjusted, and the discharge amount of the printing medium can be adjusted. The restriction required for the shape of the opening can be reduced.
[0056]
Further, according to the present invention, by discharging the printing medium using a squeegee having a fluororesin layer on the surface, the friction coefficient between the printing plate and the squeegee when the squeegee is slid is reduced, and the wear of the printing plate is reduced. , Etc., can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the appearance of a printing plate according to the present invention.
FIG. 2 is a three side view of the metal plate used for the printing plate according to the first embodiment of the present invention.
FIG. 3 is an explanatory view showing a method for manufacturing a metal plate used for a printing plate according to the present invention.
FIG. 4 is an explanatory diagram for explaining a printing method according to the present invention.
FIG. 5 is a three-sided view of a metal plate used for a printing plate according to Embodiment 2 of the present invention.
FIG. 6 is a three-sided view of a metal plate used for a printing plate according to Embodiment 3 of the present invention.
FIG. 7 is a three-sided view of a metal plate used for a printing plate according to Embodiment 4 of the present invention.
FIG. 8 is a three-sided view of a metal plate used for another printing plate according to Embodiment 4 of the present invention.
[Explanation of symbols]
1 printing plate
10 Metal plate
11 Opening
12 resin layer
13 Fluororesin layer
20 grooves
50a, 50b Photomask
82 phosphor paste
83 Squeegee
83a Hard rubber
83b Fluororesin

Claims (5)

In a printing plate having an opening penetrating between a printing surface opposed to a printing material and a squeegee surface on which a squeegee is slid,
The opening is characterized in that the opening area on the printing surface side is larger than the opening area on the squeegee surface side, and the opening area at the center in the thickness direction is smaller than the opening area on the squeegee surface side. Print version. In a printing plate having a plurality of openings penetrating between a printing surface facing a printing object and a squeegee surface on which a squeegee is slid,
A printing plate having a groove connecting the openings on the squeegee surface side. The printing plate according to claim 1, wherein the opening has a shape that becomes narrower in a traveling direction in which the squeegee is slid. The printing plate according to any one of claims 1 to 3, further comprising a resin layer on the surface on the printing surface side and a fluororesin layer on the surface on the squeegee surface side. The printing medium is discharged from the squeegee surface side to the printing surface side through a printing plate having an opening penetrating between a printing surface facing the printing material and a squeegee surface on which a squeegee is slid. In the printing method of transferring to
A printing method, comprising discharging the printing medium using a squeegee having a fluororesin layer on the surface.

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