JP2004281082A - Paste for forming ceramic rib, ceramic rib and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide paste capable of forming a rib having a high aspect ratio with a small pitch without depending on a storage period, in relation to formation of a rib-like article in a manufacturing process of a plasma display panel or the like. <P>SOLUTION: This paste can form the rib-like articles 13 on a surface of a substrate 10 by sticking a blade 12 having predetermined comb teeth 12b in a paste film 11 formed on the surface of the substrate 10, and by moving the blade 12 in a certain direction with respect to the paste film 11 to elastically deform the paste film 11. The composition of the paste contains: 50-97 wt.% of glass powder or glass and ceramic mixed powder; 0.1-15 wt.% of a resin; 3-60 wt.% of a solvent; and 0.1-20 wt.% of one or more kinds of organic thixotropic agent. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００５３】
表１から明らかなように、比較例１と比べて、実施例１では、あきらかにアスペクト比が向上しているとともに、リブの高さＨ，幅_Ｃ，アスペクト比Ｈ／Ｗ_Ｃの各データのばらつきが減少しており、セラミックリブ１４における寸法精度が向上していることが解る。
つまり、実施例では比較例に比べて、高精細のＰＤＰに対して対応することが可能であると考えられる。
【００５４】
【発明の効果】
本発明によれば、前記ペーストの組成が、ガラス粉末又はガラス・セラミック混合粉末を５０〜９７重量％、樹脂を０．１〜１５重量％、溶剤を３〜６０重量％、を含み、このペースト組成に０．１〜２０重量％の少なくとも一種類以上の有機揺変剤を、増粘剤、ダレ防止剤、沈降防止剤として加えることにより、ペーストに大きなチクソ性（チクソトロピーＴｈｉｘｏｔｒｏｐｙ）を持たせることが可能となるため、ペーストにシェアー（切断：ｓｈｅａｒ）のかかる成形時には粘度が低下し、塑性変形を受けやすくなり、シェアーの無くなる成形後には粘度が高くなる。つまり、ブレードによるリブ形成時にブレードに過大な反力を作用することなく、かつ、成形精度を維持した状態で不必要なペーストを除去することができるため、成形したペーストにおけるリブ形状を維持し、リブ形成における寸法精度を向上することが可能となる。
【図面の簡単な説明】
【図１】本発明に係るセラミックリブを形成するためのペーストの第１実施形態におけるセラミックキャピラリリブの形成状態を示す斜視図である。
【図２】図１のＡ−Ａ線断面におけるセラミックキャピラリリブを乾燥、加熱及び焼成することにより得たセラミックリブを示す断面図である。
【図３】そのブレードの正面図である。
【図４】図３のＢ−Ｂ線断面図である。
【図５】本発明に係るセラミックリブを形成するためのペーストの第２実施形態におけるセラミックキャピラリリブの形成状態を示す図１に対応する斜視図である。
【図６】図５のＢ−Ｂ線断面におけるセラミックキャピラリ層付リブを乾燥、加熱及び焼成することにより得た絶縁層付セラミックリブを示す図２に対応する断面図である。
【図７】ペースト中における揺変剤の働きを示す模式図で、外力のない状態（ａ）、および外力のある状態（ｂ）を示すものである。
【符号の説明】
１０ ガラス基板
１１ ペースト膜
１２ ブレード
１２ａ エツジ
１２ｂ くし歯
１３，２３ リブ状物
１４，２５ セラミックリブ
２２ 下地層
２４ 絶縁下地層
Ｐ 溶剤（分散剤・樹脂等を含む）
Ｔ 揺変剤Ｔ
Ｓ ガラス−セラミック粒子[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a process for producing a rib-like material (ceramic library) for producing a flat panel display (FPD) such as a plasma display panel (PDP) or a plasma addressed liquid crystal display (PALC) such as a PALC (plasma display panel). The present invention relates to a method for producing the same, a method for forming a rib-like material used therefor, a ceramic rib made from the rib-like material, and an FPD having the ceramic rib.
[0002]
[Prior art]
Conventionally, a ceramic rib is formed by applying a paste on a glass substrate to form a paste film, and then sticking a blade on the paste film in this state, and moving the blade relative to the paste film in a fixed direction. As a result, the paste film is plastically deformed to form a rib. (Patent Document 1)
The above-mentioned paste is configured so that a rib-like material can be formed by plastic deformation. This paste contains 50 to 98% by weight of a glass powder or a glass-ceramic mixed powder, 0.1 to 10% by weight of a resin, 2 to 50% by weight of a solvent, and a specific surface area of 10 m. ² / G or more of ceramic ultrafine particles (inorganic fine particles) of 10% by weight or more.
[0003]
[Patent Document 1]
JP 2000-268729 A
[0004]
[Problems to be solved by the invention]
However, the viscosity of the conventional paste to which only ceramic ultrafine particles (inorganic fine particles) are added as described above increases, and a large force is required for stirring and mixing. For this reason, it was difficult to produce paste using mass production equipment (apparatus).
Further, in the method for forming a ceramic rib using the above paste, since the viscosity of the paste is high, it is difficult to keep the blade traveling speed constant, and the rib height depending on the blade traveling speed fluctuates, and the There is a problem that the deviation of the rib height becomes large.
[0005]
An object of the present invention is to provide a paste that has a viscosity in a range that enables production of a paste using mass production equipment (apparatus), and that can form a rib having a narrow pitch and a high aspect ratio. It is to provide a ceramic rib made from this paste as well as an FPD (flat panel display) having the ceramic rib.
[0006]
[Means for Solving the Problems]
The paste for forming the ceramic rib of the present invention is obtained by piercing a blade having predetermined comb teeth into a paste film formed on the substrate surface and moving the blade in a fixed direction relative to the paste film. A paste capable of forming a rib on the surface of the substrate by plastically deforming the paste film,
The composition of the paste is 50 to 97% by weight of a glass powder or a glass-ceramic mixed powder, 0.1 to 15% by weight of a resin, 3 to 60% by weight of a solvent, and 0 to 100% of at least one organic thixotropic agent. The above problem was solved by containing 0.1 to 20% by weight.
[0007]
The paste for forming the ceramic rib of the present invention can be prepared at the above composition, so that the viscosity of the paste during production can be reduced to a range where mass production equipment can be used. Paste production becomes possible. Further, during blade molding, the viscosity of the paste is sharply reduced to about 10 to 200 Pa · s due to shear stress received from the blade, so that the paste is plastically deformed according to the blade opening shape to form a rib. Immediately after molding, since the shear stress from the blade is removed, the viscosity rises sharply to about 1000 to 3000 Pa · s, the shape of the formed rib is maintained without change, and the narrow pitch and high aspect ratio are maintained. A ratio rib can be obtained. Further, during blade molding, since the viscosity of the paste is reduced to about 10 to 200 Pa.s, it is possible to perform rib molding at a constant traveling speed without exerting a reaction force on the traveling of the blade, The deviation (variation) of the rib height in the substrate can be reduced.
[0008]
The paste for forming the ceramic rib of the present invention may further contain one or both of a plasticizer and a dispersant.
[0009]
The method for forming a rib-like material of the present invention includes a step of applying the above paste on a substrate surface to form a paste film, and piercing the paste film with a blade having predetermined comb teeth, and applying the blade to the paste film. On the other hand, the above problem is solved by having a step of forming the rib-like material on the surface of the substrate by plastically deforming the paste film by moving the paste film relatively in a fixed direction.
[0010]
The ceramic rib of the present invention is preferably formed by drying and firing the rib-like material formed by the above method.
[0011]
The FPD of the present invention has the above-mentioned ceramic rib.
[0012]
In the present invention, a rib, a ceramic rib, and an FPD can be manufactured from the above paste.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a first embodiment of a paste for forming a ceramic rib according to the present invention will be described with reference to the drawings.
[0014]
As shown in FIG. 1, in the present embodiment, a comb-shaped tooth 12 b formed on a blade 12 is provided on a paste film 11 formed by applying a paste on the surface of a substrate 10. Is formed on the surface of the substrate 10 by moving the blade 12 or the substrate 10 in a certain direction with the edge 12a of the blade 12 in contact with the surface of the substrate 10.
[0015]
The paste is a paste containing a glass powder or a glass-ceramic mixed powder, a resin, a solvent (solvent, plasticizer, dispersant), and an organic thixotropic agent. ₂ , B ₂ O ₃ , ZnO, PbO or the like as a main component, and preferably has a softening point of 300 ° C. to 600 ° C.
[0016]
Glass / ceramic mixed powder is SiO ₂ , B ₂ O ₃ , ZnO, PbO, etc. as a main component, and a ceramic powder such as alumina, zircon, cordierite, mullite, forsterite, etc. serving as a filler (aggregate). The ribs 13 are mixed to make the thermal expansion coefficient of the rib 13 equal to the thermal expansion coefficient of the glass substrate 10 and to improve the strength of the fired ceramic rib.
[0017]
The content of the ceramic powder is preferably 60% by volume or less. If the amount of the ceramic powder exceeds 60% by volume, the ceramic ribs become porous, which is not preferable. In addition, it is preferable that the particle diameters of the glass powder and the ceramic powder are each 0.1 to 30 μm. When the particle diameter of the glass powder and the ceramic powder is less than 0.1 μm, the particles tend to aggregate and the handling becomes complicated. On the other hand, if it exceeds 30 μm, there is a problem that a desired rib 13 cannot be formed at the time of molding the blade 12 described later.
[0018]
The paste contains 50 to 97% by weight of glass powder or glass / ceramic mixed powder, 0.1 to 15% by weight of resin, 3 to 60% by weight of solvent, and 0.1 to 20% by weight of organic thixotropic agent. And each is prepared by blending Here, the reason that the glass powder or the glass-ceramic mixed powder is limited to the range of 50 to 97% by weight is that if it is less than 50% by weight, it becomes difficult to obtain a rib having a predetermined shape using a blade. If the content is more than the weight percentage, it becomes difficult to uniformly apply the paste to the substrate surface.
[0019]
The reason why the resin is limited to the range of 0.1 to 15% by weight is that if it is less than 0.1% by weight, it becomes difficult to obtain a rib-like material having a predetermined shape using a blade, and if it exceeds 15% by weight, the substrate becomes This is because it is difficult to uniformly apply the paste on the surface, and there is a problem that the organic matter remains in the fired ceramic rib.
[0020]
The reason why the solvent is limited to the range of 3 to 60% by weight is that if it is less than 3% by weight, it becomes difficult to produce a paste, and if it exceeds 60% by weight, a rib having a predetermined shape is obtained using a blade. It becomes difficult.
[0021]
Also, the reason why the organic thixotropic agent is set in the range of 0.1 to 20% by weight is that if it is less than 0.1% by weight, sufficient thixotropy cannot be obtained, and a rib-like material having a predetermined shape using a blade. Is not preferable because it is difficult to obtain the paste, and when the content is more than 20% by weight, the viscosity of the paste becomes too high, which causes a problem that the paste production becomes difficult, which is not preferable.
[0022]
By adjusting the paste as described above, during blade molding, the viscosity of the paste sharply decreases to about 10 to 200 Pa · s due to the shear stress received from the blade, so that the paste is plastically deformed according to the blade opening shape, and the rib-like material is formed. Form. Immediately after molding, since the shear stress from the blade is removed, the viscosity rises sharply to about 1000 to 3000 Pa · s, and the formed rib shape is maintained without change, and has a narrow pitch and a high aspect ratio. Can be obtained. Furthermore, during blade molding, since the viscosity of the paste is reduced to about 10 to 200 Pa · s, it is possible to form a rib at a constant traveling speed without exerting a reaction force on the traveling of the blade, The rib height deviation (variation) in the substrate can be reduced.
In the above paste, by adding an organic thixotropic agent excellent in thixotropy, it is possible to give the paste a large thixotropy (Thixotropic) and simultaneously improve the moldability and shape retention of the paste. .
[0023]
As the resin, a polymer having a function as a binder, easily decomposing thermally, and having a high viscosity when dissolved in a solvent, such as a cellulose resin (ethyl cellulose, methyl cellulose, etc.), an acrylic resin (polymethyl methacrylate, polyethyl Methacrylate).
[0024]
Examples of the organic thixotropic agent include a hydrogenated castor oil system, an amide system, a dextrin fatty acid ester system, a polyethylene oxide system, a vegetable oil / polymerized oil system, and a surfactant system.
[0025]
As the solvent, an alcohol-based, ether-based, or ester-based solvent is preferable. The paste is composed of the above-mentioned powder, resin and organic thixotropic agent, and a solvent. If necessary, these may be used as a main component, and in addition, a plasticizer and a dispersant may be included. Examples of the plasticizer include glycerin and dibutyl phthalate.
[0026]
Further, as dispersants, polyoxyethylene alkylphenyl ether phosphoric acid, polyoxyethylene dialkylphenyl ether phosphoric acid, polyoxyethylene alkyl ether phosphoric acid, polyoxyphenyl ether phosphoric acid, lauryl phosphoric acid, polyoxyethylene lauryl ether phosphoric acid Acid, sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene oleyl ether phosphate, sodium polyoxyethylene alkyl phenyl ether phosphate, sodium lauryl sulfate, triethanolamine lauryl sulfate, ammonium lauryl sulfate, potassium lauryl sulfate, polyoxyethylene Sodium lauryl ether sulfate, polyoxyethylene lauryl sulfate triethanolamine, polyoxyethylene lauryl sulfate ammonium Um, triethanolamine dodecylbenzenesulfonate, octyl phenoxy Siji sodium ethoxyethyl sulfonate, sodium tetradecene sulfonate, polyether carboxylic acids, dispersants such as esters ether polycarboxylic acids.
[0027]
The paste is applied to the surface of the substrate 10 by an existing means such as a roll coating method, a screen printing method, a die coating method, a bar coating method, or a doctor blade method. Next, the paste film 11 is plastically deformed by a blade 12 to form a rib 13 having a predetermined shape. The rib 13 is kept in a deformed shape, and glass powder or the like is uniformly dispersed in the rib 13.
[0028]
A plurality of comb teeth 12b are formed at equal intervals and in the same direction on the blade 12 which comes into contact with the surface of the substrate 10 on which the paste film 11 is formed. The blade 12 is made of a metal, ceramic or plastic and a composite material thereof that does not react with the paste or is dissolved in the paste, and particularly includes Fe, Ni, and Co from the viewpoint of dimensional accuracy and durability. An alloy or a cemented carbide or ceramic in which ceramic such as tungsten carbide is dispersed in Co or Ni is preferable. The gap between the comb teeth 12b is formed in accordance with the cross-sectional shape of the rib 13 formed by the blade 12.
As shown in FIGS. 3 and 4, the blade 12 in the present embodiment is made of stainless steel or cemented carbide having a thickness t, a pitch P of the comb teeth, a gap w between the comb teeth, and a depth h thereof having a predetermined value. It is formed.
[0029]
Here, when the thickness of the blade 12 is 0.005 mm or more and 5 mm or less, the pitch of the comb teeth is P, the gap between the comb teeth is w, and the depth of the gap is h, 0.05 ≦ It is preferable that h ≦ 5.0 mm and 0.03 mm ≦ w ≦ 3.0 mm. The rib-like material 13 formed by the blade 12 satisfying these conditions is tightened by subsequent drying and firing, and a dense ceramic rib 14 having desired rib gaps can be obtained.
Further, the shape of the interstices of the comb teeth 12b is not limited to the case of forming a square shape as shown in FIG. May be formed. If the shape of the interstices of the comb teeth 12b is trapezoidal, it is possible to form a rib-like material 13 suitable for applications with a wide opening, and if the shape of the gap of the comb teeth 12b is inverted trapezoidal, The rib-like material 13 whose top is flattened with a large area can be formed.
[0030]
As shown in FIG. 1, the ribs 13 formed by the blade 12 configured as described above are formed by piercing the comb teeth 12 b of the blade 12 with the paste film 11 and bringing the edge 12 a into contact with the surface of the substrate 10. By fixing the substrate 10 and moving the blade 12 in a certain direction as shown by a solid arrow in FIG. 1, or by fixing the blade 12 and moving the substrate 10 in a certain direction as shown by a dashed arrow in FIG. This is performed by plastically deforming the paste film 11. That is, the portion corresponding to the comb teeth 12b of the paste applied to the surface of the substrate 10 by the relative movement of the blade 12 moves or is swept away between the comb teeth 12b and is located in the gap between the comb teeth 12b. Only the paste remains on the substrate 10 to form the ribs 13 on the surface of the substrate 10. If the depth of the groove of the comb tooth is larger than the thickness of the paste film 11, the paste swept out when moving the blade 12 or the glass substrate 10 enters the groove and has a height equal to or greater than the thickness of the paste film 11. The rib 13 can be formed.
[0031]
After the rib-like material 13 having the predetermined shape is formed, it is dried in the air at 100 to 200 ° C. for 10 to 30 minutes, and further baked in the air at 520 to 580 ° C. for 10 to 30 minutes. Is obtained.
Using this ceramic rib, a PDP (not shown) can be manufactured.
[0032]
As shown in the enlarged circle of FIG. 2, the ceramic rib 14 formed on the substrate 10 as described above has a height H of the rib 14 and a rib at a height (１ ／) H. 14 width W _C Where H and W _C Are 4% or less, respectively, and H / W _C Is preferably 1.5 to 10. When the rib pitch is small and the aspect ratio is 1.5 to 10, an extremely high-definition ceramic rib 14 can be obtained.
[0033]
In the paste of the present embodiment, a large thixotropy (Thixotropic) is added to the paste by adding at least one or more organic thixotropic agents as a thickener, an anti-dripping agent, and an anti-settling agent as described above. It is possible to have. For this reason, when the paste is subjected to shearing (cutting), the viscosity is reduced at the time of molding, the plastic is liable to undergo plastic deformation, and the viscosity is increased after the molding at which the shear is lost.
For this reason, the viscosity decreases when a cutting force is applied, such as for plastically deforming the paste during molding, and it becomes possible to easily perform plastic deformation. Thus, the formed shape can be easily maintained. That is, the moldability and shape retention of the paste can be simultaneously improved.
[0034]
Thus, when the ribs 13 are formed by the blades 12, the blade 12 does not exert an excessive reaction force on the comb teeth 12 b and does not hinder the advancement of the blades 12. Since unnecessary paste can be removed, the rib shape of the formed paste 11 can be maintained, and the dimensional accuracy in forming the rib can be improved while maintaining the forming accuracy of the paste film 11. The shape of the ribs 13 in the paste can be maintained. Furthermore, since the reaction force applied to the blade 12 comb teeth 12b can be reduced, the strength of the blade 12 comb teeth 12b required for molding can be reduced, so that the dimensions of the comb teeth 12b in the blade 12 are reduced. As a result, it is possible to form ribs with higher definition, improve the dimensional accuracy in forming the ribs 13, and maintain a high shape retention index.
[0035]
At the same time, the viscosity and thixotropy of the paste can be adjusted by adding an organic thixotropic agent having high thixotropy to the paste. Therefore, a desired rib shape can be obtained by adjusting the amount of addition.
[0036]
Thereby, by piercing a blade having predetermined comb teeth into the paste film formed on the substrate surface and moving the blade in a fixed direction relative to the paste film, the paste film is plastically deformed and When forming a rib on the substrate surface, for example, when forming a rib of about 60 μm with a pitch of about 120 μm, the dimensional accuracy can be reduced to about ± 5 μm or less.
[0037]
Hereinafter, a second embodiment of a paste for forming a ceramic rib according to the present invention will be described with reference to the drawings.
[0038]
5 and 6, the same reference numerals are given to the same components as those in FIGS. 1 and 2, and the description thereof will be omitted.
[0039]
In this embodiment, similarly to the first embodiment, the comb teeth 12b of the blade 12 are pierced into the paste film 11 formed on the surface of the substrate 10, and the edge 12a of the blade 12 is moved from the surface of the substrate 10 to a predetermined position. By moving the blade 12 or the substrate 10 in a certain direction while the height is floating, the paste film 11 is plastically deformed, so that an underlayer 22 on the surface of the substrate 10 and a rib-like material 23 having a predetermined shape on the underlayer 22 are formed. Is formed. The components of the paste and the method of applying the paste are configured in the same manner as in the first embodiment.
[0040]
As shown in FIG. 5, the ribs 23 are formed by the blade 12 by fixing the substrate 10 while the edge 12 a of the blade 12 is floated at a predetermined height from the surface of the substrate 10 on which the paste film 11 is formed. This is performed by moving the blade 12 in a certain direction as shown by the arrow, or by moving the substrate 10 in a certain direction as shown by a broken arrow with the blade 12 fixed.
By this movement, the paste from the surface of the substrate 10 to a predetermined height remains on the surface of the substrate to form the underlayer 22. In the paste above the underlayer 22, a portion corresponding to the comb teeth 12b of the blade 12 is combed. The paste is moved or swept away between the teeth 12b, and only the paste located between the comb teeth 12b remains on the underlayer 22 to form the rib-like material 23 having a predetermined shape on the underlayer 22. You.
[0041]
Next, an insulating underlayer 24 is formed on the substrate 10 shown in FIG. 5 from the underlayer 22 and the ribs 23 in the same manner as in the first embodiment. The rib 25 is formed.
As shown in the enlarged circle of FIG. 6, the ceramic rib 25 formed on the insulating base layer 24 has a height H of the rib 25 and a width of the rib 25 at a height (（) H. To W _C Where H and W _C Are 4% or less, respectively, and H / W _C Is preferably 1.5 to 10. When the rib pitch is small and the aspect ratio is 1.5 to 10, an extremely fine ceramic rib 25 can be obtained.
[0042]
In the present embodiment, the same effects as in the first embodiment can be obtained.
[0043]
In each of the above embodiments, as shown in FIG. 7A, the thixotropic agent is a three-dimensional thixotropic agent T inside a solvent (including a dispersant, a resin, etc.) P in the paste. Is formed to increase the viscosity and connect the glass-ceramic particles S to each other. It is considered that in this state, when an external force is applied at the time of blade molding or the like, the bonding of the thixotropic agent T is broken, as shown in FIG.
[0044]
Next, examples of the present invention will be described in detail together with comparative examples.
[0045]
<Example 1>
PbO-SiO with an average particle size of 1 μm ₂ One B ₂ O ₃ 80% by weight based glass powder and an average particle size O.O. 20% by weight of 5 μm alumina powder was prepared, and both were sufficiently mixed. This mixed powder, ethyl cellulose as a resin, amide wax as an organic thixotropic agent, and α-terpineol as a solvent are in a weight ratio of 88.5 / 0.2 / 0.3 / 11. Weighed. The weighed mixed powder, resin, organic thixotropic agent and solvent were sufficiently kneaded to obtain a paste.
[0046]
Next, as shown in FIG. 1, in a state where a rectangular soda lime glass substrate 10 having a diagonal dimension of 42 inches and a thickness of 3 mm is fixed, the paste is roll-coated on the glass substrate 10. Was applied to form a paste film 11 with a thickness of 150 μm.
[0047]
A blade 12 made of stainless steel having a pitch P of the comb teeth 12b of 120 μm, a gap w of the comb teeth 12b of 60 μm, a depth h of 200 μm, and a thickness t of 0.1 mm was prepared. (FIGS. 3 and 4)
[0048]
After the paste is applied, the comb teeth 12b of the blade 12 are pierced into the paste film 11 while the glass substrate 10 is fixed, and the edges 12a thereof are brought into contact with the glass substrate 10, as shown by solid arrows in FIG. The ribs 13 were formed on the surface of the substrate 10 by moving the blade 12 in a predetermined direction to plastically deform the paste film 11. Thereafter, the rib-like material 13 was dried in the air at 150 ° C. for 20 minutes to evaporate the solvent, and was further baked in the air at 550 ° C. for 10 minutes to obtain the ceramic rib 14. This ceramic rib 14 was used as Example 1.
[0049]
<Comparative Example 1>
PbO-SiO with an average particle size of 1 μm ₂ One B ₂ O ₃ 80% by weight based glass powder and an average particle size O.O. 20% by weight of 5 μm alumina powder was prepared, and both were sufficiently mixed. This mixed powder, ethyl cellulose as a resin, α-terpineol as a solvent, and silica as ceramic ultrafine particles (specific surface area of 300 m ² / G) was mixed at a weight ratio of 87/1/1/1/1 and kneaded sufficiently to obtain a ceramic paste. Hereinafter, a rib 13 and a ceramic rib 14 were obtained in the same procedure as in Example 1. This ceramic rib 14 was used as Comparative Example 1.
[0050]
<Comparison test and evaluation>
The height H and width of the arbitrary 100 ceramic ribs 14 of Example 1 obtained by firing in this manner and the arbitrary 100 of the ceramic ribs 14 obtained in Comparative Example 1 were as follows. Were measured as follows.
[0051]
As shown in FIG. 2, the width of 100 arbitrary ceramic ribs on the substrate of Example 1 and Comparative Example 1 was measured by measuring the height (１ ／) H when the height of the ceramic rib was H. Rib width W at _C From these heights H and widths W, the respective aspect ratios H / W _C Was calculated. After calculating the average of these measured values, H, W _C , H / W _C Were calculated.
Table 1 shows the results of Example 1 and Comparative Example 1 (height H and width of rib). _C , Aspect ratio H / W _C (Average value and variation value) are shown in comparison.
[0052]
[Table 1]

[0053]
As is clear from Table 1, in Example 1, the aspect ratio was clearly improved and the height H and width of the ribs were higher than those in Comparative Example 1. _C , Aspect ratio H / W _C It can be seen that the variance of each data is reduced, and the dimensional accuracy of the ceramic rib 14 is improved.
That is, it is considered that the embodiment can deal with a high-definition PDP as compared with the comparative example.
[0054]
【The invention's effect】
According to the present invention, the composition of the paste includes 50 to 97% by weight of a glass powder or a glass-ceramic mixed powder, 0.1 to 15% by weight of a resin, and 3 to 60% by weight of a solvent. By adding 0.1 to 20% by weight of at least one or more organic thixotropic agents to the composition as a thickener, an anti-sagging agent, and an anti-settling agent, so that the paste has a large thixotropic property (Thixotropic). Therefore, when the paste is subjected to shearing (cutting: shearing), the viscosity decreases, the plastic becomes susceptible to plastic deformation, and the viscosity increases after the shearing is lost. In other words, during the rib formation by the blade, without applying excessive reaction force to the blade, and since unnecessary paste can be removed while maintaining the molding accuracy, the rib shape in the molded paste is maintained, It is possible to improve the dimensional accuracy in rib formation.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state of forming a ceramic capillary rib in a first embodiment of a paste for forming a ceramic rib according to the present invention.
2 is a cross-sectional view showing a ceramic rib obtained by drying, heating, and firing the ceramic capillary rib in a cross section taken along line AA of FIG. 1;
FIG. 3 is a front view of the blade.
FIG. 4 is a sectional view taken along line BB of FIG. 3;
FIG. 5 is a perspective view corresponding to FIG. 1 showing a state of forming a ceramic capillary rib in a second embodiment of a paste for forming a ceramic rib according to the present invention.
6 is a cross-sectional view corresponding to FIG. 2, showing the ceramic ribs with an insulating layer obtained by drying, heating, and firing the ribs with a ceramic capillary layer in a cross section taken along line BB of FIG. 5;
FIG. 7 is a schematic diagram showing the action of the thixotropic agent in the paste, showing a state without external force (a) and a state with external force (b).
[Explanation of symbols]
10 Glass substrate
11 Paste film
12 blades
12a Edge
12b comb teeth
13,23 ribs
14,25 Ceramic rib
22 Underlayer
24 Insulating underlayer
P solvent (including dispersant, resin, etc.)
T Thixotropic agent T
S glass-ceramic particles

Claims (5)

By piercing a blade having predetermined comb teeth into the paste film formed on the substrate surface and moving the blade relative to the paste film in a fixed direction, the paste film is plastically deformed and the paste film is formed on the substrate surface. A paste capable of forming ribs,
The composition of the paste is 50 to 97% by weight of a glass powder or a glass-ceramic mixed powder, 0.1 to 15% by weight of a resin, 3 to 60% by weight of a solvent, and 0 to 100% of at least one organic thixotropic agent. A paste for forming a ceramic rib, comprising 1 to 20% by weight. The paste for forming a ceramic rib according to claim 1, wherein the paste comprises one or both of a plasticizer and a dispersant. Applying the paste according to claim 1 to a substrate surface to form a paste film;
A blade having predetermined comb teeth is pierced into the paste film, and the blade is plastically deformed by moving the blade in a fixed direction relative to the paste film to form a rib on the substrate surface. The process of
A method for forming a rib-like material, comprising: 4. A ceramic rib formed by drying and firing a rib-like material formed by the method according to claim 3. An FPD comprising the ceramic rib according to claim 4.

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