JP2008166115A - Method for manufacturing plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a plasma display panel by preventing a transfer failure of a blanket roll and deterioration of printing accuracy by repetition of printing. <P>SOLUTION: This is a manufacturing method of a plasma display panel to form an electrode by laminating a first ink pattern and a second ink pattern on a glass plate w. After a first transfer process is carried out in which, after the first ink pattern is formed by filling a first ink in a first intaglio 21a, it is received from the first intaglio to a first blanket roll 22a and then, is transferred from the first blanket roll to the glass plate, a second transfer process is carried out in which, after the second ink pattern is formed by filling a second ink in a second intaglio 21b, this is received from the second intaglio to a second blanket roll 22b, and then, is transferred from the second blanket roll to the glass plate on which the first ink pattern is transferred. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In particular, the present invention relates to a method for manufacturing a plasma display panel suitable for manufacturing a front panel of a plasma display.

  In recent years, since the above plasma display is a self-luminous display, it can reduce power consumption and can easily be made large and large compared to a liquid crystal display device. There are great expectations.

This plasma display is composed of a front plate and a back plate. On the front plate, an electrode pattern such as a bus electrode is formed on a glass plate, and a dielectric layer or the like is formed so as to cover the electrode pattern. Has been. On the other hand, on the back plate, an electrode pattern and a dielectric layer are formed on a glass plate, and a plurality of stripe-shaped partition walls are formed in parallel on the dielectric layer, and red, blue, A phosphor layer such as green is disposed.
For example, the bus electrode is obtained by applying a black photosensitive paste to a glass plate by photolithography, performing exposure, development, etc., and then applying, exposing, developing, etc., a silver photosensitive paste, A pattern is formed, and when the bus electrode is formed, a large amount of photosensitive paste is washed and removed during development. As described above, a large amount of useless material that is removed in the manufacturing process is generated in the plasma display, and the fact that the manufacturing cost is extremely high is a major obstacle to dissemination for households.

  For this reason, as a plasma display manufacturing method, for example, as shown in Patent Document 1, a method of forming an electrode pattern by offset printing has been proposed. That is, after the black ink pattern received from the printing plate cylinder to the blanket roll is transferred to the glass plate, the blanket roll is heated to evaporate the solvent in the ink, and then the blanket roll is cooled. Next, a method has been proposed in which a silver ink pattern is received from a printing plate cylinder onto a blanket roll, and the silver ink pattern is transferred onto the black ink pattern by the blanket roll to form a bus electrode.

  According to this printing method, the black ink pattern or silver ink pattern patterned by the printing plate cylinder can be transferred to the glass plate via the blanket roll, and thus is removed in the manufacturing process like the photolithography method. The production cost of the plasma display can be reduced without generating a large amount of wasted material.

  However, in the above printing method, since the black ink pattern and the silver ink pattern are transferred to the glass plate by the same blanket roll, it is difficult to finely adjust the shape of both ink patterns, and the blanket roll material Must be selected for both inks. For this reason, since the blanket roll cannot select a material suitable for preventing the swelling caused by the respective ink solvent, it is likely to swell and cause a transfer failure during repeated ink transfer. There is a problem.

  Furthermore, if the blanket roll is heated and cooled after the ink pattern is transferred from the blanket roll to the glass plate as described above in order to prevent the blanket roll from swelling, the processing time is required for heating and cooling. In addition, the repeated heating and cooling may cause deterioration of the blanket roll as well as deterioration of temperature control of the clean room in which the plasma display panel is manufactured. As a result, the printing accuracy of the ink pattern itself may be reduced, and the printing accuracy may be significantly reduced.

JP 2005-7599 A

  The present invention has been made in view of such circumstances, and provides a method for manufacturing a plasma display panel by a cost-competitive printing method by preventing defective transfer of blanket rolls and reduction in printing accuracy due to repeated printing. The task is to do.

  That is, the invention described in claim 1 is a method of manufacturing a plasma display panel in which an electrode is formed by laminating a first ink pattern and a second ink pattern on a glass plate. After the ink pattern is formed by filling the first intaglio with the first ink, the first intaglio is received by the first blanket roll, and then the first blanket roll is transferred to the glass plate. After the first transfer step of transferring, the second ink pattern is formed by filling the second intaglio with the second ink, and then received from the second intaglio to the second blanket roll. Then, a second transfer step is performed in which the second blanket roll is transferred to the glass plate on which the first ink pattern is transferred.

  According to a second aspect of the present invention, in the method for manufacturing a plasma display panel according to the first aspect, in the first transfer step, the first ink pattern is received by the cylindrical first blanket roll. Then, while moving the first blanket roll along the surface of the glass plate in a state where the outer peripheral surface of the first blanket roll is in contact with the surface of the glass plate, the first blanket roll is moved along the axis. The first ink pattern is transferred from the first blanket roll to the glass plate by rotating around, and in the second transfer step, the second ink pattern is transferred to the cylindrical second After receiving the blanket roll, the outer peripheral surface of the second blanket roll is in contact with the surface of the glass plate. The second ink pattern is moved from the second blanket roll to the first ink pattern by rotating the second blanket roll about the axis while moving the second blanket roll along the surface of the glass plate. It is characterized in that it is transferred to a glass plate having been transferred.

  According to a third aspect of the present invention, in the method for manufacturing a plasma display panel according to the first or second aspect, in the first transfer step, the first ink pattern received by the first blanket roll is dried. Then, the dried first ink pattern is transferred to the glass plate, and the first transferred to the glass plate is transferred between the first transfer step and the second transfer step. After having dried the second ink pattern received by the second blanket roll in the second transfer step, and having a first curing / drying step of curing and drying one ink pattern; The dried second ink pattern is transferred to the glass plate, and after the second transfer step, the second ink pattern transferred to the glass plate is transferred. Curing, is characterized by having a second curing and drying step of drying.

  According to the invention described in any one of claims 1 to 3, in the first transfer step, the first ink pattern patterned by the first intaglio is made into glass through the first blanket roll. In the second transfer step, the second ink pattern can be similarly transferred to the glass plate transferred to the plate and transferred with the first ink pattern.

As a result, when transferring the first ink pattern or the second ink pattern to the glass plate, cost competitiveness can be achieved without generating a large amount of wasted material that is removed in the manufacturing process as in the photolithography method. A plasma display panel can be provided.
Furthermore, since the first blanket roll and the second blanket roll can select materials according to the first ink or the second ink, transfer defects occur due to swelling with the ink solvent. Can be prevented.

  According to a second aspect of the present invention, in the first transfer step, after the first ink pattern is received by the cylindrical first blanket roll, the first blanket roll By rotating the first blanket roll around the axis while moving the first blanket roll along the surface of the glass plate in a state where the outer peripheral surface is in contact with the surface of the glass plate, the first blanket roll is rotated. It is preferable to transfer the ink pattern from the first blanket roll to the glass plate from the viewpoint of improving transfer accuracy, and in the second transfer step, the second ink pattern is transferred to the cylindrical second blanket. After the roll is received, the second blanket roll is placed in a state where the outer peripheral surface of the second blanket roll is in contact with the surface of the glass plate. The glass on which the first ink pattern is transferred from the second blanket roll by rotating the second blanket roll around the axis while moving along the surface of the glass plate. Transfer to a plate is preferable from the viewpoint of improving transfer accuracy.

  In particular, according to the invention described in claim 3, the first ink pattern made of the first ink received by the first blanket roll is dried in the first transfer step, and the first ink pattern It is possible to transfer to the glass plate with the viscosity increased and the cohesive force increased, and the transferability of the first ink pattern can be improved. Next, after the first ink pattern formed on the glass plate is cured and dried in the first curing / drying step, similarly, the second ink pattern received by the second blanket roll is It can be dried in the second transfer step, transferred to a glass plate with increased cohesive force, and cured and dried in the second curing / drying step.

  Accordingly, the first blanket roll after the first ink pattern is transferred to the glass plate and the second blanket roll after the second ink pattern is transferred to the glass plate are caused by the remaining ink solvent. Since there is no problem such as swelling, and it is not necessary to heat and cool the first blanket roll and the second blanket roll, the deterioration of the temperature control of the clean room and the deterioration of each blanket roll are prevented, and the ink pattern A decrease in transfer accuracy can be prevented.

  Hereinafter, when explaining a method for manufacturing a front panel of a plasma display according to the present invention, first, a front panel and an apparatus for manufacturing the front panel will be briefly described.

  The front plate of the plasma display of this embodiment is configured by forming a bus electrode on a rectangular glass plate w by offset printing and forming a dielectric layer on the bus electrode.

  As shown in FIG. 1, the offset printing machine for printing and forming bus electrodes on the glass plate includes a mounting table 1 with a built-in heater on which the glass plate w is mounted, and 2 disposed above the mounting table 1. A set including a set of offset printing plate cylinder sets 2a and 2b and a curing and drying means 3 provided so as to be movable in the horizontal direction from directly above the glass plate w is used.

  These offset printing plate cylinder sets 2a and 2b are arranged to face each other above both sides of the opposite side of the glass plate w so as to sandwich the glass plate w therebetween. One intaglio 21a and a first blanket roll 22a are provided, and the other offset printing plate cylinder set 2b has a second intaglio 21b and a second blanket roll 22b.

  The first intaglio 21a and the second intaglio 21b are gravure plate cylinders that are formed in a columnar shape that can rotate around an axis, respectively, and above the opposite sides C and D of the glass plate w, respectively. The opposing sides C and D and the axial directions of the intaglios 21a and 21b are arranged in parallel to each other.

  Further, outside the first intaglio plate 21a and the second intaglio plate 21b, an ink reservoir (not shown) and a finisher roll (not shown) for supplying ink from the ink reservoir to the intaglio plates 21a and 21b, respectively. And a doctor blade (not shown) for scraping off excess ink filled in the intaglio plates 21a and 21b by the ink supply unit.

  Then, in the ink reservoir outside the intaglio 21a, black powder such as pigment is added to the resin and solvent, premixed with a mixer, and then kneaded using a three-roll mill. Contains ink. On the other hand, the ink reservoir outside the intaglio plate 21b contains silver ink obtained by adding silver powder such as silver powder to a solvent or the like, and premixing and kneading.

  As this resin, any of photo-curing and thermosetting resins can be used, but preferably an acrylic-styrene copolymer, an acrylic-urethane copolymer, an acrylic-epoxy copolymer, a urethane acrylate. Alternatively, a thermosetting material containing epoxy acrylate is used. This resin imparts a high cohesive force to the ink and suppresses cohesive failure inside the ink during transfer from the blanket rolls 22a and 22b to the glass plate w. The molecular weight of this resin is preferably several hundreds to several millions. It has a quick drying property in the case of a low molecular weight, and in the case of a high molecular weight, it further suppresses the cohesive failure inside the ink. Is excellent.

  Moreover, as a solvent, diethylene glycol monobutyl ether, ethylene glycol monobutyl ether, diethylene glycol dimethyl ether, γ-butyl lactone, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, ethylene glycol monophenyl ether, ethylene glycol dibutyl ether, propylene glycol monomethyl ether, propylene glycol Monoethyl ether, propylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, triethylene glycol, triethylene glycol monomethyl ether , Triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, 3-methoxy-3-methyl-1-butanol, polyester polyol [aliphatic polybasic acid having 2 to 12 carbon atoms and fat having 2 to 12 carbon atoms] Group polyhydric alcohol], polyester polyol [aromatic polybasic having 8 to 15 carbon atoms / aliphatic polyhydric alcohol having 2 to 12 carbon atoms] and a hydroxyl group-containing liquid acrylic resin or What contains 2 or more types is used. By containing these solvents, it is possible to dissolve the above resin, and when the blanket rolls 22a and 22b are received, a part of the solvent is absorbed by the silicone rubber of the blanket rolls 22a and 22b. Since a weak boundary layer (WBL) is formed between the ink and the blanket rolls 22a and 22b, the ink pattern can be transferred without leaving the blanket rolls 22a and 22b.

  Further, as the powder, a pigment or dye made of metal powder, metal oxide, metal nitride, or a mixed powder thereof is used.

  Furthermore, the above-mentioned ink is preferably blended in a proportion of 5 to 20% by mass of the above-mentioned resin and 5 to 30% by mass of the solvent, and in addition to the above-mentioned powder, resin and solvent, In order to make it smooth, it is more preferable that the dispersing agent is contained at a ratio of 1 to 10% by mass.

  Furthermore, arc-shaped cover members 23 are disposed on the outer circumferences of the first intaglio 21a and the second 21b, respectively, and these cover members 23 are provided on the first intaglio 21a and the second 21b. A plurality of sheets (two sheets in this embodiment) are arranged along the outer peripheral surface at intervals that do not interfere with the supply of ink by the finisher roll and the transfer of the ink pattern to the blanket rolls 22a and 22b. ing.

  On the other hand, the first blanket roll 22a and the second blanket roll 22b are each formed in a columnar shape, and the outer peripheral surface is formed of silicone rubber. The blanket rolls 22a and 22b are respectively above the opposite sides of the glass plate w, and the axial direction of the blanket rolls 22a and 22b and the axial direction of the intaglio plates 21a and 21b are parallel to each other, and the surface of the silicone rubber Is arranged so as to be in contact with the outer peripheral surfaces of the intaglio plates 21a and 21b, and is provided to be rotatable around the axis in synchronization with the intaglio plates 21a and 21b. Thereby, the ink pattern transferred to one glass plate w is received from the intaglio plates 21a and 21b.

Further, the blanket rolls 22a and 22b are respectively provided so as to be movable up and down and horizontally moved. As a result, the blanket rolls 22a and 22b descend from the upper positions on both sides and come into contact with the surface of the glass plate w. It rotates around the axis while moving from the opposite side C side to the other opposite side D side or from the other opposite side D side to the one opposite side C side.
Further, on the outer circumferences of these blanket rolls 22a and 22b, the ink patterns received from the intaglio plates 21a and 21b when the blanket rolls 22a and 22b are located above the opposite sides C and D of the glass plate w, respectively. Arc-shaped air blowing mechanisms 24a and 24b for blowing dry air toward are provided.

  On the other hand, the curing and drying means 3 is provided so as to be horizontally movable in a direction perpendicular to the moving direction of the blanket rolls 22a and 22b, and is provided so as to be vertically movable right above the glass w. When the ink pattern formed on the surface contains a photo-curable resin, the ink pattern is irradiated with light and cured, and the ink pattern that has been photo-cured or thermally cured by a heater built in the mounting table 1 Alternatively, the ink pattern is dried by blowing hot air.

Next, a method for manufacturing the front plate of the plasma display according to this embodiment according to the method for manufacturing a plasma display panel of the present invention will be described.
The front plate manufacturing method of the present embodiment is a first method in which the black ink pattern (first ink pattern) described above is received from the first intaglio 21a to the first blanket roll 22a and transferred to the glass plate w. And a first curing / drying step of curing and drying the black ink pattern transferred to the glass plate w in the first transfer step.

Further, after the first curing / drying step, the above-described silver ink pattern (second ink pattern) is received from the second intaglio 21b to the second blanket roll 22b to form the black ink pattern. A second transfer step for transferring to the glass plate w, and a second curing / drying step for curing and drying the silver ink pattern transferred to the glass plate w in the second transfer step. .
In this embodiment, the black ink and the silver ink contain a thermosetting resin.

  In this first transfer step, black ink is supplied from an ink reservoir filled with black ink to the intaglio 21a that rotates in the clockwise direction A using a finisher roll, and the first intaglio is used by a doctor blade. The black ink pattern is formed by scraping off the excess black ink filled in 21a, and this black ink pattern is received by the first blanket roll 22a that rotates counterclockwise in the A direction.

  Next, the black ink pattern received by the first blanket roll 22a is dried by circulating dry air along the outer peripheral surface of the first blanket roll 22a by the blower mechanism 24a. Thereafter, the first blanket roll 22a is lowered from the upper position on the side of the glass plate w and brought into contact with the surface of the glass plate w, so that the opposite side D from the one opposing side C side of the glass plate w. While being moved to the side, the ink is rotated in the clockwise direction (B direction) in the opposite direction to that when ink is received from the first intaglio 21a. As a result, the black ink pattern having a high viscosity and a large cohesive force due to drying by the dry air of the blower mechanism 24a is all transferred to the glass plate w.

  Next, in the first curing / drying step, the black ink pattern on the glass plate w is heated by the heater built in the mounting table 1 and cured, and then the curing / drying means 3 is moved in the moving direction of the blanket roll 22a. Is moved horizontally in a direction orthogonal to the glass plate w, and when it is located directly above the glass plate w, it is moved in the vertical downward direction (the direction of the arrow in FIG. 1). Thereby, the black ink pattern is dried by blowing hot air or hot air onto the black ink pattern by the curing and drying means 3 brought close to the glass plate w. Thereafter, the curing and drying means 3 is moved vertically upward (in the direction of the arrow in FIG. 1) and then horizontally moved to return to the original position from directly above the glass plate w.

  Next, in the second transfer step, the silver ink is supplied from the ink reservoir filled with the silver ink to the second intaglio plate 21b rotated in the counterclockwise direction A using a finisher roll, and the doctor blade By scraping off the excess silver ink filled in the second intaglio plate 21b, a silver ink pattern is formed, and this silver ink pattern is received by the second blanket roll 22b rotating in the clockwise A direction.

  Next, the silver ink pattern received by the second blanket roll 22b is dried by circulating dry air along the outer peripheral surface of the second blanket roll 22b by the blower mechanism 24b. Thereafter, the second blanket roll 22b is lowered from the upper side position on the side of the glass plate w and is brought into contact with the surface of the glass plate w so that the one opposing side C from the other opposing side D side of the glass plate w. While being moved to the side, the ink is rotated counterclockwise (direction B) in the opposite direction to that when ink is received from the second intaglio plate 21b. As a result, all the silver ink patterns having a high viscosity and a large cohesive force due to drying with the dry air of the blower mechanism 24b are transferred to the glass plate w.

  Next, in the second curing / drying step, as in the first curing / drying step, the silver ink pattern of the glass plate w is heated by the heater built in the mounting table 1 and cured, The curing and drying means 3 is horizontally moved in a direction intersecting the moving direction of the blanket rolls 22a and 22b, and is moved vertically downward (in the direction of the arrow in FIG. 1) when it is positioned directly above the glass plate w. Thereby, the silver ink pattern is dried by blowing hot air or hot air on the silver ink pattern by the curing and drying means 3 brought close to the glass plate w. Thereafter, the curing and drying means 3 is moved vertically upward (in the direction of the arrow in FIG. 1) and then horizontally moved to return to the original position from directly above the glass plate w.

  Next, the glass plate w on which the black ink pattern and the silver ink pattern are formed is moved in the same direction as the curing and drying means 3 and is taken out, and a dielectric layer or the like is formed on the glass plate w in the next process, and plasma A front panel of the display panel was constructed. The glass plate w was also carried in by moving the glass plate w in the same direction as the curing and drying means 3.

According to the method for manufacturing the front plate of the plasma display of the above-described embodiment, after the black ink pattern patterned by the first intaglio 21a is received by the first blanket roll 22a in the first transfer step. Since it is dried by the blower mechanism 24a, transferability can be improved and transferred to the glass plate w.
Next, after the black ink pattern is cured and dried in the first curing / drying step, the silver ink pattern patterned by the second intaglio plate 21b is received by the second blanket roll 22b in the second transfer step. Then, since it is dried by the blower mechanism 24b, transferability can be improved and transferred to the glass plate w. Thereafter, in the second curing / drying step, after the silver ink pattern is cured and dried, the glass plate w is taken out, and a dielectric layer or the like is formed in the next step to manufacture a front plate of the plasma display. be able to.

  Thereby, in order to transfer the black ink pattern and the silver ink pattern which were respectively formed by the first intaglio 21a and the second intaglio 21b to the glass plate w, a large amount removed in the manufacturing process as in the photolithography method. A plasma display panel having cost competitiveness can be provided without generating useless materials.

  Further, since the black ink pattern and the silver ink pattern have high transferability when transferred to the glass plate w, all the ink is transferred to the glass plate w, and the first blanket roll 22a and the second blanket roll 22a are transferred. The ink solvent remaining on the blanket roll 22b can prevent the blanket rolls 22a and 22b from swelling to cause transfer failure. Accordingly, since it is not necessary to heat and cool the blanket rolls 22a and 22b, it is possible to prevent deterioration of temperature management in the clean room and deterioration of the blanket rolls 22a and 22b, thereby preventing a decrease in ink pattern transfer accuracy. .

  Further, since the first blanket roll 22a and the second blanket roll 22b can each select a silicone rubber material in accordance with the black ink or the silver ink, a transfer failure occurs due to expansion by the ink solvent. Can be prevented more reliably.

  In addition, this invention is not limited at all by the above-mentioned embodiment, For example, it replaces with the movement of blanket roll 22a, 22b, and the state which contact | connected the glass plate w to the outer peripheral surface of the lower part of blanket roll 22a, 22b The blanket rolls 22a and 22b and the glass plate w may be moved relative to each other. Further, by using a photocurable resin instead of a thermosetting resin, the ink pattern is irradiated with light using the curing and drying means 3 in the first curing / drying step and the second curing / drying step. After curing, the ink pattern may be dried by blowing hot air or the like, or the ink pattern is cured by light irradiation by the curing drying means 3 and heating by the heater of the mounting table 1 and then dried. Is also good.

It is a conceptual explanatory view of an offset printing machine according to the present invention.

Explanation of symbols

w Glass plate 21a First intaglio 21b Second intaglio 22a First blanket roll 22b Second blanket roll

Claims (3)

A method of manufacturing a plasma display panel in which an electrode is formed by laminating a first ink pattern and a second ink pattern on a glass plate,
After the first ink pattern is formed by filling the first intaglio with the first ink, the first intaglio is received by the first blanket roll, and then from the first blanket roll After performing the first transfer process to transfer to the glass plate,
After the second ink pattern is formed by filling the second intaglio with the second ink, the second intaglio is received by the second blanket roll, and then from the second blanket roll. A method of manufacturing a plasma display panel, comprising performing a second transfer step of transferring to a glass plate having a first ink pattern transferred thereto. In the first transfer step, after the first ink pattern is received by the cylindrical first blanket roll, the outer peripheral surface of the first blanket roll is in contact with the surface of the glass plate. The first ink pattern is moved from the first blanket roll to the glass plate by rotating the first blanket roll about the axis while moving the first blanket roll along the surface of the glass plate. And in the second transfer step, after the second ink pattern is received by the cylindrical second blanket roll, the outer peripheral surface of the second blanket roll is the surface of the glass plate. The second blanket while moving the second blanket roll along the surface of the glass plate while being in contact with 2. The plasma according to claim 1, wherein the second ink pattern is transferred from the second blanket roll to a glass plate onto which the first ink pattern is transferred by rotating the roll around an axis. Display panel manufacturing method. In the first transfer step, after the first ink pattern received by the first blanket roll is dried, the dried first ink pattern is transferred to the glass plate, and the first ink pattern is transferred to the glass plate. Between the transfer step and the second transfer step, there is a first curing / drying step for curing and drying the first ink pattern transferred to the glass plate, and the second In the transfer step, after the second ink pattern received by the second blanket roll is dried, the dried second ink pattern is transferred to the glass plate, and the second transfer step. 3. The plasma according to claim 1, further comprising a second curing / drying step of curing and drying the second ink pattern transferred to the glass plate. A method for manufacturing a mdisplay panel.

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