WO2007086340A1

WO2007086340A1 - Wiping cloth

Info

Publication number: WO2007086340A1
Application number: PCT/JP2007/050905
Authority: WO
Inventors: Norikazu Tabata; Toshihiko Yagi; Yoshihiro Tani
Original assignee: Toray Industries, Inc.
Priority date: 2006-01-24
Filing date: 2007-01-22
Publication date: 2007-08-02
Also published as: JP2010182678A

Abstract

[PROBLEMS] To provide a wiping cloth which is less apt to leave a wiping residue, can remove a microfine-particle-containing paste without marring the surface being wiped, and holds the microfine particles in the fabric without fail and prevent them from flying off the system. [MEANS FOR SOLVING PROBLEMS] The wiping cloth is a fabric for wiping off a substantially water-free paste containing particles with a maximum particle diameter of 40 µm or smaller and having a paste viscosity of 0.5-50 Pa·s. It comprises ultrafine fibers each having a fineness of 1.0 dtex or less and has a fabric bulk density of 2.2 cm3/g or higher and a fabric thickness of 0.25 mm or larger.

Description

Specification

Wiving cloth

Technical field

[0001] The present invention relates to a wiping cloth for wiping off a paste.

Background art

[0002] Various wiping members are used for the purpose of removing unnecessary materials.

[0003] For example, in the production of a color filter, when a pattern is formed by ejecting ink from an inkjet head, a wiping cloth is used to clean the droplet ejection portion of the liquid ink droplet ejection head and its surroundings. It is disclosed that it is used (Patent Document 1).

[0004] Further, it is disclosed that a high-density knitted fabric composed of a composite yarn composed of extra fine fibers and thick fine fibers is excellent in the wipeability of the spectacle lens oil film (dirt) (Patent Document 2). .

[0005] Furthermore, in plasma display manufacturing, when a phosphor layer is formed by applying a phosphor paste by a screen printing method, the phosphor paste on the attached screen printing plate is used for plate cleaning of the screen plate. It is disclosed that the paste is removed by wiping with a paper wiper (Patent Document 3).

[0006] Power! In plasma display manufacturing, as a method of removing the phosphor paste, when a phosphor layer is formed by ejecting a phosphor paste having a needle discharge port, the phosphor paste adhered to the discharge port surface is used. In addition, a method of wiping and removing a wiping member with a plate-like member such as rubber is disclosed (Patent Document 4).

Patent Document 1: Japanese Patent Laid-Open No. 2004-337709

Patent Document 2: JP-A-9 19393

Patent Document 3: Japanese Patent Laid-Open No. 2000-104053

Patent Document 4: Japanese Patent Laid-Open No. 10-233163

Disclosure of the invention

Problems to be solved by the invention

[0007] However, with such a plate-like member, a sheet containing a powder such as a phosphor paste is used. In the method of removing the strike, there was a problem that the paste was left unwiped and the wipeability was not sufficient. In addition, the phosphor powder in the paste is sandwiched between the discharge port surface of the base and the wiping cloth, and the phosphor powder is rubbed. There is a problem that the manufacturing cost is increased. In addition, the phosphor powder that has been wiped off scatters around the paste applicator, resulting in a decrease in clean room cleanliness.

[0008] Therefore, the object of the present invention is excellent in the wiping property of a paste containing a fine powder such as a phosphor paste, and a surface to be wiped such as a discharge port or a discharge port surface of the die when wiping. An object of the present invention is to provide a wiping material that can remove the paste without damaging it, and reliably retain the wiped paste and powder so as not to dissipate out of the system.

Means for solving the problem

[0009] (1) A fabric for wiping off a substantially non-aqueous paste containing a powder having a maximum particle size of 40 μm or less and having a paste viscosity of 0.5 to 50 Pa · s, comprising at least a single fiber A wiping cloth comprising ultrafine fibers having a fineness of 1 dtex or less, the bulk height of the fabric being 2.2 cm ³ Zg or more, and the fabric thickness being 0.25 mm or more.

(2) The wiping cloth according to the above (1), wherein the fabric is for wiping off the paste adhered to the paste application device.

(3) Paste applicator-a cloth for wiping off a paste adhering to a die having a one-dollar discharge port, comprising at least a fine fiber having a single fiber fineness of 1 dtex or less. A wiping cloth with an altitude of 2.2 cm ³ Zg or more and a fabric thickness of 0.25 mm or more.

(4) The wiping cloth according to (3), wherein the paste is used for forming a phosphor layer of a plasma display substrate.

(5) The wiping cloth according to any one of (1) to (4) above, wherein the surface coverage of the ultrafine fibers is at least 70% on the fabric surface at least on the wiping surface side.

(6) The wiping cloth according to any one of the above (1) to (5), wherein in the fabric, ultrafine fibers are unevenly distributed near the surface in the thickness direction of the fabric.

(7) The ultrafine fibers are unevenly distributed on both surfaces of the fabric (1) to (1) (6) !, The wiping cloth as described in the deviation.

(8) The webbing cloth according to any one of the above (1) to (1), wherein the ultrafine fibers are those obtained by false twisting.

(9) The wiping cloth according to any one of (1) to (8), wherein the fabric has a solvent absorption rate of lOOmmZlO or more.

(10) The wiping cloth according to any one of (1) to (9) above, wherein the cloth has a fine particle generation force of not less than 0.5 m and not more than 100 ZCF.

(11) The wiping cloth according to any one of (1) to (10) above, wherein the compression energy of the fabric is 0.08 gf'cmZcm ² or more.

(12) The wiping cloth according to any one of (1) to (11) above, wherein the compression recovery energy of the fabric is 0.04 gf'cmZcm ² or more.

(13) The fabric according to the above (1) to (12), wherein the fabric comprises a thick fiber of 2.5 decitex or more, and the boiling water shrinkage of the thick fiber is 10 to 25%. ) The wiping cloth according to any one of

(14) The wiping cloth according to any one of (1) to (13), wherein the fabric is a knitted fabric.

(15) The wiping cloth according to (14), wherein the knitted fabric is a circular knitting. The invention's effect

[0010] By wiping using the wiping cloth of the present invention, the fine powder-containing paste can be removed without damaging the surface to be wiped when wiping with little wiping remaining. Furthermore, the fine powder is securely held in the fabric and is not dissipated out of the system. The wiping cloth of the present invention is suitable for wiping off a phosphor paste for forming a phosphor layer of a plasma display substrate. In particular, it is suitable for wiping off the phosphor paste adhering to the discharge port and discharge port surface of the base of the phosphor paced coating apparatus.

Brief Description of Drawings

FIG. 1 is an example of a relationship diagram between applied pressure and fabric thickness in a compression cycle in a compression test.

FIG. 2 is an apparatus diagram of a cleaning unit equipped with a wiping cloth in a continuous wiping test of a phosphor paste using a wiping cloth used in an example of the present invention. FIG. 3 is a scanning electron micrograph of the wiping surface of the wiping cloth after 3,000 wiping operations in Comparative Example 1.

FIG. 4 is a scanning electron micrograph (enlarged) of the wiping surface of the wiping cloth after 3,000 wiping operations in Comparative Example 1.

FIG. 5 is a scanning electron micrograph of the cross-section of the wiping cloth when wiping is performed 3000 times in Comparative Example 1.

FIG. 6 is a scanning electron micrograph (enlarged) of the cross-section of the wiping cloth after 3,000 wiping operations in Comparative Example 1.

FIG. 7 is a scanning electron micrograph of the back surface of the wiping cloth after 3,000 wiping operations in Comparative Example 1.

FIG. 8 is a scanning electron micrograph (enlarged) of the back surface of the wiping cloth after 3,000 wiping operations in Comparative Example 1.

FIG. 9 is a scanning electron micrograph of the wiping surface of the wiping cloth when wiping is performed 3000 times in Example 2.

FIG. 10 is a scanning electron micrograph (enlarged) of the wiping surface of the wiping cloth when the number of wiping operations is 3000 in Example 2.

FIG. 11 is a scanning electron micrograph of the cross-section of the wiping cloth when wiping is performed 3000 times in Example 2.

FIG. 12 is a scanning electron micrograph (enlarged) of a cross-section of a wiping cloth when wiping is performed 3000 times in Example 2.

FIG. 13 is a scanning electron micrograph of the back surface of a wiping cloth when wiping is performed 3000 times in Example 2.

FIG. 14 is a scanning electron micrograph (enlarged) of the back surface of the wiping cloth when wiping is performed 3000 times in Example 2.

Explanation of symbols

1 base

2 Discharge port surface 3 Wiving cloth

4 Wiping cloth feeding roll

5 Wiping cloth scraping roll

6 Guide Ronore

7 Pressing roll

8 Pressing roll

9 Guide roll

BEST MODE FOR CARRYING OUT THE INVENTION

First, the mechanism by which the wiping cloth of the present invention exhibits excellent characteristics will be described.

[0014] The wiping cloth of the present invention is configured to include extra fine fibers, and has a bulky and thick fabric force. Wiping cloth force of the present invention Excellent wipeability of paste containing fine powder, can be removed without damaging the metal or grease on the paste-adhering surface when wiping, and the wiped powder is securely held and system The reason for having the excellent property of not dissipating outside is not necessarily clear, but it is assumed as follows. That is, the ultra-fine fiber on the fabric surface wipes off the relatively high-viscosity paste containing the powder almost without wiping, and takes it into the fabric. The fabric structure that is bulky and has many gaps allows the powder component in the paste to be efficiently taken into the fabric, and the powder component is taken into and held in the fabric in order to dissipate outside the fabric. I won't let you. Further, even if the thick fabric is a large amount of paste, it provides a sufficiently wide gap space to be taken into the fabric.

[0015] In particular, the phosphor powder used for the plasma display substrate usually has an average particle diameter in the range of 0.5 to 6 / zm, and the average particle diameter of the ultrafine fiber phosphor powder provided on the fabric surface is Since they have the same diameter, they are wiped off by the ultrafine fibers on the fabric surface, and almost all particles enter the gaps between the ultrafine fibers. However, since the phosphor particles escape between the ultrafine fibers and do not remain on the surface of the fabric, the phosphor paste can be removed without damaging the surface to be wiped such as the discharge port or the discharge port surface when wiping. Can do. If large diameter fibers are present on the surface of the fabric, wipe The pressure at the time of removal is directly applied to the phosphor particles through the large-diameter fibers, and the phosphor particles are pressed against the surface to be wiped with a strong pressure, which easily damages the discharge port of the base or the periphery of the discharge port.

[0016] Even when the same pressing pressure is applied to the wiping cloth for wiping, the pressure actually applied to each fiber is related to the contact area of the fabric with the wiping surface. In the case of ultra-fine fibers, the number of fibers per unit area is overwhelmingly large, so the number of contact points is also large, so the force received by each single fiber is small. When the wiping cloth is pressed against the wiping surface, the phosphor particles cannot easily press against the wiping surface because they easily escape between the fine fibers. In addition, when escaping, the pressure that is pressed becomes relatively small. On the other hand, in the case of large-diameter fibers, the force applied to each single fiber is large, and the hard phosphor particles are pressed against the wiping surface by that force, so the surface to be wiped is easily damaged. Also, due to the thickness of the fiber itself, the wiping surface is also damaged while the particles are difficult to escape between the fibers.

[0017] In general, ultrafine fibers are excellent in wiping properties such as oil film because force S is presumed to be strongly contributed by the area of the surface area. In the present invention, ultrafine fibers present on the surface of the fabric are used for a specific paste. The reason why the wiping property is particularly excellent is completely different from the case of wiping the oil film as described above. In addition, the effect of drastically reducing scratches caused by the powder can be obtained. In addition, as described below

By covering the back side of the fabric (the surface opposite to the wiping surface) with ultrafine fibers, it is possible to prevent or suppress the powder from escaping from the back of the fabric system.

[0018] For the purpose of imparting fabric strength and imparting compressive recovery force to the fabric during pressing, a fabric structure in which fine fibers are provided inside the fabric is preferred, whereas ultrafine fibers are disposed on the surface layer. Therefore, it is particularly preferable that the ultrafine fibers are unevenly distributed in the vicinity of the surface in the thickness direction of the fabric, which preferably has a high ultrafine fiber coverage on the fabric surface. It is preferable that the fabric structure with many bulky gaps is not lost because the gaps are crushed against the pressing pressure during wiping, especially in order to efficiently incorporate the powder component in the paste into the fabric. In this sense, a fabric having a large compression energy and a high compression recovery force is preferred. In addition, providing ultrafine fibers on the back side of the fabric prevents and suppresses the incorporated powder from escaping from the fabric. Accordingly, it is preferable that the ultrafine fiber coverage is unevenly distributed in the vicinity of the back surface in the thickness direction of the fabric, which preferably has a high ultrafine fiber coverage on the back surface of the fabric. Particularly preferred. If the powder is scattered outside the fabric, the degree of cleanliness around the paste applicator is reduced. Usually, when manufacturing a plasma display substrate, a phosphor paste coating process for forming a phosphor layer is also performed in a clean room, and therefore, a decrease in cleanness leads to contamination of the substrate with powder, which is not preferable.

[0019] It is presumed that the excellent characteristics of the wiping cloth of the present invention are expressed by the mechanism as described above.

Next, the attribute of the wiping cloth of the present invention will be described individually.

[0021] The wiping cloth of the present invention contains a powder having a maximum particle size of 40 μm or less and is used for wiping off a substantially water-free paste having a paste viscosity of 0.5 to 50 Pa's. .

[0022] Here, non-water-containing means that the paste does not contain water, and it is essential that water is used as the paste component.

[0023] Examples of the powder of the present invention include, but are not limited to, a phosphor, an inorganic coloring material, a magnetic material, and a pigment. In particular, inorganic phosphors are preferably used. The maximum particle size of the powder must be 40 μm or less. If the maximum particle size of the powder exceeds 40 μm, the wiping performance with the wiping cloth is reduced and the surface to be wiped is easily damaged during wiping. Further, the range of the particle diameter of the powder is preferably 0.5 to 30 / ζ πι.

[0024] The paste contains an organic binder and an organic solvent as components other than the powder, and may contain a dispersant, a plasticizer, a leveling agent, and the like as necessary. The paste viscosity must be between 0.5 and 50 Pa's, and between 5 and 50? When the paste viscosity exceeds 50 Pa's, the paste remains on the fabric surface, and the powder becomes difficult to be taken into the fabric, and the surface to be wiped is easily damaged. If it is less than 0.5 Pa's, the paste may sag during wiping and the paste may dissipate outside the wiping cloth.

[0025] The ultrafine fiber of the present invention has at least a single fiber fineness of 1 dtex or less in that a high wiping effect can be obtained, and scratching of the surface to be wiped by the powder component contained in the paste is minimized. It is essential. The ultrafine fiber preferably has a single fiber fineness in the range of 0.001 to 1 decitex. 0. 01-0. 5 in the range of 5 dtex. Force S Further preferred 0. 01 to 0 Particularly preferred is 1 dtex.

[0026] In the wiping cloth of the present invention, it is essential that the bulkiness of the fabric is 2.2 cm ³ Zg or more. is there. This is because the powder component in the paste is efficiently taken into the fabric. On the other hand, the bulkiness of the fabric is preferably 10 cm ³ Zg or less from the viewpoint of reliably holding the incorporated paste in the fabric.

[0027] In the wiping cloth of the present invention, it is essential that the fabric has a thickness of 0.25 mm or more. This is because the powder component in the paste is efficiently taken into the fabric. On the other hand, if the fabric thickness is large, the fabric length per delivery roll is shortened, so the frequency of roll replacement is increased and the influence on productivity is undesirable. It is preferable that

[0028] The bulkiness of the fabric and the thickness of the fabric refer to values calculated by the following method with reference to JIS L1096 (general woven fabric test method) and JIS L1018 (knitted fabric test method).

[Measurement of fabric thickness]

A test piece of 20 cm × 20 cm was prepared and measured by applying a predetermined pressure with a presser foot using a thickness measuring machine. The presser foot was 2cm ^{2 for} woven fabric and 10cm ² for knitted fabric. The pressure, in the textile 240GfZcm ^2, the knitted fabric was 7gfZcm ^2. The thickness after 10 seconds after applying pressure was read with a dial gauge (peacock meter) to obtain the fabric thickness t (mm).

[Measurement of bulk height of fabric]

The weight (gZm ² ) of one 20 cm x 20 cm fabric was measured, and the bulk height (cm ³ / g) was determined from the above fabric thickness t (mm) and fabric weight W (g / m ² ) according to the following formula. Calculated.

[0029] Bulk height (cm ³ Zg) = t / WX 1000

The fabric of the present invention is suitably used as a wiping cloth for wiping off the paste adhered to the paste application device.

[0030] As a wiping method using the wiping cloth of the present invention, as a method of wiping means including the wiping cloth, (1) a method of pressing the wiping cloth against the base surface near the discharge port, (2) As a method of moving while pressing the wiping cloth against the base surface near the discharge port, on the other hand, as a method of moving the base having the discharge port, that is, the side to be wiped, (3) the base near the discharge port Such as pressing the surface against the wiping cloth, (4) moving the base surface near the discharge port against the wiping cloth, etc. The wiping method is not limited to these methods.

[0031] Further, the number of wiping operations may be performed multiple times at the same location on the wiping cloth, or by using the unused surface of the wiping cloth on the base surface on which the wiping operation has been performed once. You can add a wipe operation.

[0032] Prior to the wiping operation, the wiping cloth of the present invention is preferably impregnated with a solvent and wiped off the paste while retaining the solvent. The solvent to be used is not particularly limited, but it is preferable to use a solvent that dissolves the paste. An example of such a solvent is acetone. Solvent power The speed at which the S wiping cloth penetrates and spreads can be tested with the solvent used at the time of wiping. It is also possible to estimate whether the penetration speed is good or bad from the water permeability, that is, the water absorption speed. .

[0033] Further, in removing the paste from the die surface having the discharge port, in addition to the wiping method using the wiping cloth of the present invention, another paste removing method may be used in combination. As another paste removing method, for example, a method of removing the paste with an adhesive tape can be mentioned. More specifically, a method of (1) removing the residual paste near the discharge port first using an adhesive tape, and wiping and removing the paste that has been completely removed using the wiping cloth of the present invention. (2) First of all, a method of removing a paste with strong force with an adhesive tape after wiping and removing with the wiping cloth of the present invention can be mentioned.

[0034] The paste coating apparatus of the present invention includes a screen printing method using a screen plate, an ink jet method, a dispenser method that discharges nozzle force paste by controlling air pressure, a die method that uses a die having a needle outlet, and the like. Although not particularly limited, a coating apparatus that performs coating by a die method that has high accuracy and high yield and excellent production efficiency even when the paste contains a powder component at a high concentration is preferable. Therefore, it is preferable to select the paste coating apparatus of the present invention.

[0035] The wiping cloth of the present invention is preferably used for the purpose of wiping off the phosphor paste for forming the phosphor layer of the plasma display substrate. Here, the phosphor paste refers to a paste-like composition containing an organic binder, an organic solvent, and phosphor powder. As a component other than these components, a dispersant, a plasticizer, a leveling agent, etc. are contained as necessary. A little.

As the phosphor powder, for example, in red, (Y, Eu) 2 O 3, Y 2 O: Eu, YVO: Eu, (

2 3 2 3 4

Y, Gd, Eu) BO, Y O S: Eu, y—Zn (PO): Mn, (ZnCd) S: Ag + In O

3 2 3 3 4 2 2 3 etc., but in green, Zn GeO: Mn, BaAl O: Mn, (Ba, Sr, Mg) 0-aAl O: M

2 2 12 19 2 3 n, (Zn, Mn) SiO, Zn SiO: Mn, LaPO: Tb, ZnS: Cu, Al, ZnS: Au, Cu, A

2 4 2 4 4

1, (ZnCd) S: Cu, Al, Zn SiO: Mn, As ゝ Y Al O: Ce ゝ CeMgAl O: Tb, Gd

2 4 3 5 12 11 19

O S: Tb, Y Al O: Tb, ZnO: Zn, etc. In blue, Sr (PO) Cl: Eu, (Ba, Eu

2 2 3 5 12 5 4 3

) MgAlO, BaMgAlO: Eu, BaMgAlO: Eu, BaMgAlO: Eu, ZnS:

10 17 14 23 16 27 2 14 24

Ag + red pigment, Y SiO 2: Ce, and the like. In particular, [(Y, Gd, Eu) BO], [(Y, E

2 3 3 u) O], [(Zn, Mn) SiO], [(Ba, Eu) MgAl O], [(Ba, Sr, Mg) 0-aAl O

2 3 2 4 10 17 2 3

: Mn] and [BaAl 2 O: Mn] are preferably used alone or in combination of two or more.

12 19

The

[0037] Further, at least one element selected from the group consisting of thulium (Tm), terbium (Tb) and europium (Eu) forces, selected from yttrium (Y), gadolinium (Gd) and lutetium (Lu). And tantalate rare earth phosphors substituted with at least one rare earth element.

[0038] Preferred examples of the rare earth tantalate phosphor include a europium activated yttrium tantalate phosphor represented by a composition formula Y Eu TaO (wherein X is approximately 0.005 to 0.1). For red phosphors, europium-activated yttrium tantalate is preferred. For green phosphors, tantalate rare earth phosphors are represented by the formula Y Tb TaO (where X is approximately 0.001-0.2). Preferred is terbium activated yttrium tantalate. The blue phosphor is preferably thulium-activated yttrium tantalate, wherein the rare earth tantalate phosphor is represented by Y TmTaO (where X is approximately 0.001 to 0.2).

[0039] Further, as a green phosphor, Mn is 0.2% by weight based on the amount of zinc silicate (Zn SiO 2)

twenty four

Above, manganese activated zinc phosphor (Zn SiO: Mn) with an average particle size of 2 μm or more and 8 μm or less activated less than 0.1% by weight and a general formula of (Zn Mn) 0-aSiO (where X And

2 4 1 2

And α is a value in the range of 0.01≤Χ≤0.2 and 0.5 <α≤1.5). [0040] Specific examples of the organic noder contained in the phosphor paste of the present invention include polybutyl petital, polyvinyl acetate, polybulal alcohol, polyethylene, silicon polymer (for example, polymethylsiloxane, polymethylphenol- Siloxane), polystyrene, butadiene / styrene copolymers, polystyrene, polyvinylpyrrolidone, polyamides, polyethers, copolymers of ethylene oxide and propylene oxide, polyacrylamides and various acrylic polymers (eg, sodium polyacrylate, poly lower alkyl) And various other copolymers and multipolymers of acrylates, poly-lower alkyl methacrylates and lower alkyl acrylates and methacrylates. In addition, cellulose compounds such as methenoresenorelose, ethenoresenorelose, hydroxysenorelose, and methinorehydroxycellulose can be preferably used because they can form a phosphor layer with little binder remaining after baking. .

[0041] The organic solvent contained in the phosphor paste of the present invention includes, for example, diethylene glycol mononobutylatenoreacetate, ethyleneglycolmonobutinorenoaterenoreconole, diethyleneglycolmonobutylether, triethyleneglycolenobutenorenore Ethenoglycol, ethylene glycolenomono-2-ethinolehexenoleetenole, diethyleneglycolenomol 2 ethyl hexyl ether, 2, 2, 4 trimethyl-1, 3, pentanediol monoisoptylate, 2, 2, 4 trimethyl 1,3 pentanediol diisopropylate, 2-ethyl-1,3 hexanediol, methyl ethyl ketone, dioxane, acetone, cyclohexanone, cyclopentanone, isobutyl alcohol, isopropyl alcohol, terpineol, benzene Organic solvents such as benzyl alcohol, tetrahydrofuran, γ-butyllatatone, etc. and one or more of these are used.

[0042] In the present invention, the polymer of the ultrafine fibers constituting the fabric is not particularly limited, but a polyester such as polyethylene terephthalate (hereinafter referred to as PET), polybutylene terephthalate (hereinafter referred to as ΡΒT), polyester elastomer, etc. Polymers having fiber-forming properties such as polyamide, nylon 6, nylon 66, polyamide elastomers such as polyamide elastomer, polyurethane, polyolefin, acrylic-tolyl, and the like are suitable. Of these, PET and PBT are preferable, and nylon 6, nylon 66, and the like are more preferable. Further, it is not necessary to use one kind of polymer, and a plurality of polymers can be used in combination. [0043] In the wiping cloth of the present invention, since the ultrafine fibers improve the wiping property of the powder-containing paste, it is preferable that the surface coverage of the ultrafine fibers on the paste wiping surface of the fabric is higher. The surface coverage of the ultrafine fibers on the wiping surface of the fabric is preferably 70% or more, more preferably 90% or more and 95% or more.

[0044] The surface coverage of the ultrafine fiber is the ratio of the area where the ultrafine fiber portion is fastened to the fabric surface (the sum of the ultrafine fiber portion + the thick fine fiber portion) when the surface photograph of the fabric is observed by SEM (scanning electron microscope) Say. Three photographs with an area of 2 mm x 2 mm or more were taken at any location on the fabric surface, and the surface coverage of the ultrafine fibers was also calculated.

[0045] In the wiping cloth of the present invention, as the ultrafine fiber, those to which crimping by false twisting is applied are preferably used. By this false twist crimp, the single fiber array can be disturbed one by one, and the wiping property and the powder uptake property on the fabric surface can be increased. For the false twisting process, a normal Woolley process or the like can be used.

[0046] In the present invention, it is preferable that the ultrafine fibers are unevenly distributed in the vicinity of the surface in the fabric thickness direction for the purpose of imparting the fabric strength as described above and imparting the compression recovery force of the fabric at the time of pressing. In particular, it is preferable that they are unevenly distributed on both surfaces. Furthermore, it is preferable to have a fabric structure in which extra fine fibers are arranged on the surface layer and thick fine fibers are provided inside the fabric. The polymer of the fine fiber that constitutes the fabric is not particularly limited, but polyester such as PET, PBT), polyester elastomer, nylon 6, nylon 66, polyamide such as polyamide elastomer, polyurethane, polyolefin, Polymers having fiber-forming properties such as acrylic-tolyl are preferred. Of these, PET and PBT are preferable, and nylon 6, nylon 66, and the like are more preferable. Moreover, it is not necessary to use one kind of polymer, and a plurality of polymers can be used in combination.

[0047] In the present invention, the thick fine fiber means a fiber having a fineness of 2.5 dtex or more. [0048] In the present invention, a yarn using ultra fine fibers and thick fine fibers, respectively, A composite yarn composed of fibers and thick fibers is used. In the entire fabric, it is preferable that the ultrafine fibers are contained at a higher weight ratio than at least the fine fibers. From the viewpoint of the bulkiness of the fabric and the wipeability, it is preferable that 50 to 80% by weight of ultrafine fibers are contained. [0049] On the other hand, thick fine fibers of 2.5 dtex or more occupy the remaining part. The strong thick fiber is preferably raw silk that has not been temporarily twisted. Further, the strong thick fiber is preferably one having a higher shrinkage property against heat than the ultrafine fiber in a state before the heat treatment. Specifically, it is preferable to use a fine fiber having a shrinkage of 10 to 25%, which is preferably 4 to 8% as a boiling water shrinkage of the ultrafine fiber. In particular, as the fine fiber, fibers having a shrinkage ratio of 4 to 8% larger than the boiling water shrinkage ratio of the ultrafine fibers are preferably used. In other words, if the heat treatment causes a shrinkage greater than that of the ultrafine fiber, the ultrafine fiber is placed in a relaxed state around the thick fiber after the heat treatment due to the difference in shrinkage. The fibers relatively form the inner layer portion of the fabric, and the ultrafine fibers relatively form the surface layer portion of the fabric. Therefore, a large and bulky fabric can be obtained. The difference in yarn length between the two is preferably such that ultrafine fibers are 3% or more longer than thick fibers.

[0050] The wiping cloth of the present invention is not particularly limited, such as a woven fabric, a knitted fabric, and a non-woven fabric, and may be a composite of a woven / knitted fabric and a non-woven fabric. Among these fabrics, the knitted fabric is preferable in that the disorder of the arrangement of the single fibers constituting the knitted fabric can be a wiping cloth having no directionality in wiping. Such a disorder in the arrangement can be obtained by water jet processing the surface of the knitted fabric. A part of the ultrafine fibers on the surface is intertwined with the thick fine fibers, the direction of the stitches is random, and the surface of the knitted fabric is It changes to a chamele. Among the knitted fabrics, a circular knitted fabric is preferably used particularly in that high productivity can be obtained.

[0051] The fabric of the present invention preferably has a solvent absorption rate of lOOmmZlO or more.

[0052] Here, the solvent absorption rate as used in the present invention means that measured by the following measurement method.

That is, using ion-exchanged water as a solvent, measurement is performed according to the JIS L1907 birec method. Take 5 pieces of 20cm x 2.5cm sample fabric in each direction, and fix each sample with a pin on a horizontal rod supported at a certain height on a water tank filled with 20 ± 2 ° C water. Then, align the lower end of the sample in a line and lower the horizontal bar so that the lower end is just immersed in water. Measure the height taken up in 10 minutes and adopt an average value of N = 5.

[0053] Although there is often a direction in the solvent absorption rate, vertical (tool) or horizontal (coal) S) The solvent absorption rate measured in either direction is preferably at least lOOmmZlO minutes. When wiping off the paste, it is preferable to apply a solvent to the fabric in advance and perform the wiping operation while the solvent is wet. Accordingly, a fabric having a solvent absorption rate equal to or higher than a specific value is preferable. If the solvent absorption rate is less than lOOmmZlO, the fabric may not sufficiently wipe the paste even if a solvent is applied.

[0054] The fabric of the present invention preferably has a fine particle generation amount of 0.5 m or more and 100 or less ZCF. If the amount of fine particle generation of 0.5 / z m or more exceeds 100 ZCF, dust will get on the substrate and cause inconvenience.

[0055] Here, the method for measuring the amount of particulate generation is as follows.

[0056] Measurement is performed using a particle counter KC-25 (manufactured by Rion). US IES— RP— CC— 003— 87— Measure the 10 samples once each according to the tumbler method described in the T standard, and calculate the average value of N = 8 excluding the maximum and minimum values. Calculate and use the number of particles generated per sample. The sample should be 240mm x 240mm. For measurement, put one sample in a tumbler installed in a vertical clean bench, suck air for 1 minute with lCF (Cubic Feet) per minute, and measure with a particle counter KC-25.

[0057] The fabric of the present invention, the compression energy is 0. 08gf 'is preferably CmZcm ² or more, compression recovery energy of the fabric is 0. 04gf' is preferably CmZcm ² or more. Further, it is more preferable that the compression energy is 0.12 gf ′ cmZcm ² or more, and it is more preferable that the compression recovery energy of the fabric is 0.06 gf ′ cmZcm ² or more. Here, the compression energy and the compression recovery energy are the compression energy and the compression recovery energy of the fabric per 1 cm ² measured by an automated compression tester KESFB3 manufactured by Kato Tech Co., Ltd. Toe Large increase the compression pressure P applied to the fabric from OGF / cm ² up to 50 gf / cm ^2, followed by reducing the compressive force from 50 gf / cm ² up to OGF / cm ² to measure the change in thickness therebetween the fabric . When the compression pressure when the compression pressure is increased is P = 0.5 gfZcm ² , and T is the thickness at compression pressure P = 50 gfZcm ² , the compression energy WC is

0 m

Compression pressure when the compression force increases 増大 = Ρ (Τ) is the integrated value from Τ = Τ to Τ,

This corresponds to the area under the curve P = P (T) in the interval from 0 m 0 to T. On the other hand, compression recovery Energy WC, integrates the value of compression pressure Ρ = ('(T) when the compression force decreases until T = T force Τ

0 m, corresponding to the area under the curve Ρ = Ρ '(Τ) in the interval from T to T.

0 m

The ratio of compression recovery energy to compression energy, wc and Zwc, is called compression resilience RC, and means the compression recovery rate in one compression cycle of increasing compression force and decreasing compression force. A higher compression recovery rate is preferred, but the higher the compression energy value and the higher the compression recovery energy value than the high compression recovery rate. The viewpoint power is also more preferable.

Example

[0058] Hereinafter, the present invention will be described in more detail by way of examples, but these examples do not limit the present invention.

[0059] (Measurement of fabric properties)

Fabric thickness, fabric bulk height, fabric compression energy, fabric compression recovery energy, and compression resilience were measured.

[0060] Figure showing an example of the relationship between pressure and thickness in the compression cycle (when compression is increased and when compression is reduced) used to calculate compression energy and compression recovery energy using the automated compression tester KESFB3 manufactured by Kato Tech Co., Ltd. Shown in 1.

(Measurement of fine particle generation)

Measurement was performed using a particle counter KC-25 (manufactured by Rion). US IES— RP— CC— 003— 87— Measure the 10 samples once each according to the tumbler method described in the T standard, and calculate the average value of N = 8 excluding the maximum and minimum values. The number of particles generated per sample was calculated. The sample used was 240 mm x 240 mm. The sample is placed in a tumbler installed in a vertical airflow clean bench, and air is sucked in for 1 minute at a lCF (Cubic Feet) suction volume for 1 minute, and measured by a particle counter KC- 25. Willow

(Measurement of solvent absorption rate)

Ion exchange water was used as a solvent. Measured according to JIS L1907 Neurec method. Take 5 x 20 cm x 2.5 cm samples in each direction, and fix each sample to a horizontal rod supported at a certain height on a water tank filled with 20 ± 2 ° C water. The bottom of Place the horizontal bars in line and place them so that their lower ends are just immersed in water. The height taken up in 10 minutes was measured, and an average value of N = 5 was adopted.

(Measurement of boiling water shrinkage)

Polyester fiber is wound 10 times with a mashing machine, the test piece a is measured by applying a load of 0.09 g A load was applied, the test length b was measured, and the boiling water shrinkage was calculated from the following equation.

[0061] Boiling water shrinkage (%) = [(a-b) / a] X 100

(Measurement of particle size of phosphor)

The particle size distribution was measured by a laser diffraction / scattering method using a microtrack 9320HRA (X-100).

(Preparation of phosphor paste)

Green phosphor (Zn, Mn) with cumulative average particle size of 3.5 m and maximum particle size of 28 m

A phosphor paste consisting of 39 g phosphor powder, 8 g organic binder (ethyl cellulose), and 53 g binder solvent (terpineol) was prepared. First, an organic binder and a binder solvent were mixed and dissolved while heating. Next, phosphor powder was added and mixed with a kneader to obtain a phosphor paste. The viscosity of the phosphor paste was 25 Pa's o

[0062] (Continuous wiping test of phosphor paste with wiping cloth)

The phosphor paste was applied to a glass substrate (width 340 mm x depth 440 mm x thickness 2.8 mm) with 1921 stripe-shaped barrier ribs (partition height 130 m, line width 30 m, pitch 220 m). The base having a one-dollar discharge port used for coating has a needle hole diameter of 150 m and a hole number of 640.

[0063] At the application start position, a pressure of 0.35 MPa was applied to the needle, and the table was applied at a speed of 50 mmZ while the clearance from the partition wall was maintained at 100 / zm. The application was stopped at the application end position. At this time, the phosphor base adhering to the discharge port and the discharge port surface of the base was wiped off with a wiping cloth provided in the cleaning unit shown in FIG.

[0064] The wiping cloth is sent 10 mm in the direction perpendicular to the direction in which the 640 discharge ports are arranged. I went.

Thereafter, paste application and wiping with a cleaning unit were repeated. When the number of wipings was 3000 times and 15000 times, the remaining paste was wiped off, the damage state of the discharge port surface of the die, and the degree of phosphor powder adhesion on the back of the wiping cloth were observed with a microscope.

[0066] (Comparative Example 1)

84 decitex as the warp yarn, 36 filament polyester long fiber (single fiber fineness: 2.3 decitex), 135 dtex false twisted as the horizontal yarn, 18-filament polyester Z polyamide sea-island type composite fiber yarn (sea 2/2 twill was woven using a single yarn fineness after elution of components (0.07 decittatus) to make a green machine. This raw machine was heat-treated in the presence of alkali to completely remove the sea components, and the horizontal yarn was broken down into ultrafine fibers. Sarakoko By treating with hot water at 130 ° C, densification by yarn shrinkage and washing were performed at the same time. Next, this fabric was subjected to a dry heat treatment at 180 ° C. for 40 seconds for finishing.

[0067] Using the obtained fabric, measurement of fabric properties and a continuous wipe test of the phosphor base using a wiping cloth were performed. The results are shown in Tables 1 and 2.

[0068] Further, the SEM (scanning electron microscope) observation of the wiped surface, the cross-section, and the back surface of the fabric was performed at the number of wiping times of 3000 times. The results are shown in Figs.

[0069] (Example 1)

56 decitex, 18 filament polyamide long fiber (single fiber fineness: 3.1 decitex) as warp yarn, 135 dtex false twisted as horizontal yarn, 18 filament polyester Z polyamide sea-island type composite fiber yarn (sea component) Using a single fiber fineness after elution: 0.07 decittatus), 5 sheets of satin were woven into a green machine. The resulting raw machine was heat-treated in the presence of alkali to completely remove the sea component, thereby breaking the horizontal yarn into ultrafine fibers. Sarakoko By treating with hot water at 130 ° C, densification by yarn shrinkage and washing were performed at the same time. Next, this fabric was subjected to a dry heat treatment at 180 ° C. for 40 seconds for finishing.

[0070] Using the obtained fabric, measurement of fabric properties and a continuous wipe test of the phosphor base using a wiping cloth were performed. The results are shown in Tables 1-3.

[0071] (Example 2)

Extra-fine fiber is 66 dtex 9 filament, [70 island Z filament: manufactured by Toray Industries, Inc.] Type polyester, island component is polyethylene terephthalate, sea component is polyester acid component, terephthalic acid and 5-sodium sulfoisophthalic acid copolymer fiber made of alkali hot water soluble polyester carrier (sea island ratio is 20Z80) Was used. As the thick fiber, 33 dtex 6-filament polyester yarn [manufactured by Toray Industries, Inc.] was used. The shrinkage of this yarn was 21.2%. On the other hand, ultra-fine fibers are false twisted (number of false twists: 3000 TZM, temperature: 180 ° C), and entangled with thick fine fibers (overfeed rate of ultra fine yarn: 2%, air pressure: 3 kgZcm ² ) to obtain a composite yarn. Furthermore, a circular knitting machine 3 2G, 15cm was used to form a live machine by knitting using the interlock method. Sea components were completely removed by heat treatment at 130 ° CX for 20 minutes and then at 80 ° C for 30 minutes in the presence of 1% sodium hydroxide. Were then water-di Etsuto processed from the surface at a pressure of lOOkgZcm ^2. Thereafter, heat setting was performed at 135 ° C. to obtain a knitted fabric.

[0072] Using the obtained fabric, measurement of fabric characteristics and a continuous wipe test of the phosphor base using a wiping cloth were performed. The results are shown in Tables 1-3.

[0073] Further, SEM (scanning electron microscope) observation of the wiped surface, cross-section and back surface of the fabric was performed at the number of wiping times of 3000 times. The results are shown in FIGS.

[Example 3]

56dTex, 18-filament split-type multifilament yarn with woolly false twisted yarn for both loop and insert yarns (The cross-sectional shape of a single-filament fiber is an 8-leaf shape with a polyamide component in the center, and polyester surrounding it) A pile knitted fabric having a loop pile length of 2 mm was knitted using a separation split type fiber in which the components were arranged and a single fiber fineness of 0.9 decitex after polyester elution / removal.

[0075] Using the obtained fabric, measurement of fabric characteristics and a continuous wipe test of the phosphor base using a wiping cloth were performed. The results are shown in Tables 1-3.

[0076] From the above, by using a wiping cloth that includes ultrafine fibers and has a specific fabric bulk height and fabric thickness, the surface to be wiped is wiped off when wiping is extremely small. The paste containing fine powder can be removed without damaging the surface. Furthermore, do not dissipate out of the system by securely holding the fine powder inside the fabric.

[0077] Further, when comparing FIGS. 3 to 8 and FIGS. 9 to 14, the powder on the fine fiber on the fabric surface is Due to the pressing during wiping, there is no escape space such as escaping between fibers (so that the surface to be wiped can be easily damaged), and a lot of powder is held around the thick fine fibers inside the fabric. (Figs. 11 to 12), and in Figs. 13 to 14, almost no powder is observed on the back of the fabric (the surface opposite to the wiping surface) (and therefore the powder is surely held in the fabric). I understand.

[table 1]

§§

¾007

Industrial applicability

As described above, when wiping is performed using the wiping cloth of the present invention, there is little wiping residue, and the fine powder-containing paste can be removed without damaging the surface to be wiped during wiping. Further, the fine powder is securely held in the fabric and is not dissipated out of the system. The wiping cloth of the present invention is suitable for wiping off a phosphor paste for forming a phosphor layer of a plasma display substrate.

[0082] In particular, it is suitable for wiping off the phosphor base adhering to the discharge port and discharge port surface of the base of the phosphor paced coating apparatus.

Claims

The scope of the claims

[I] A cloth for wiping off a substantially non-hydrated paste containing a powder having a maximum particle size of 40 μm or less and a paste viscosity of 0.5 to 50 Pa's, and having at least a single fiber fineness of 1 decitex A wiping cloth comprising the following ultrafine fibers, wherein the fabric has a bulk height of 2.2 cm ³ Zg or more and a thickness of the fabric of 0.25 mm or more.

[2] The cloth is for wiping off the paste adhering to the paste application device.

1 Wiving cloth.

[3] A paste applicator—a cloth for wiping off a paste adhering to a die having a one-dollar outlet, comprising at least a fine fiber having a single fiber fineness of 1 dtex or less. Wiping cloth with an altitude of 2.2 cm ³ Zg or more and a fabric thickness of 0.25 mm or more.

4. The wiping cloth according to claim 3, wherein the paste is used for forming a phosphor layer of a plasma display substrate.

[5] The wiping cloth according to any one of [1] to [4], wherein the surface coverage of the ultrafine fibers is at least 70% at least on the surface of the fabric on the wiping surface side.

6. The wiping cloth according to any one of claims 1 to 5, wherein in the fabric, ultrafine fibers are unevenly distributed near the surface in the thickness direction of the fabric.

7. The ultrafine fibers are unevenly distributed on both surfaces of the fabric! The wiping cloth described in the slippage.

[8] The wiping cloth according to any one of [1] to [7], wherein the ultrafine fiber is false twisted.

[9] The wiping cloth according to any one of [1] to [8], wherein the fabric has a solvent absorption rate of lOOmmZlO or more.

[10] The fine particle generation amount of 0.5 m or more of the fabric is 100 pieces or less ZCF or less.

V, the wiping cloth described in the slippage.

[II] The wiping cloth according to any one of claims 1 to 10, wherein the compression energy of the fabric is 0.08 gf'cmZcm ² or more.

[12] The application is characterized in that the compression recovery energy of the fabric is 0.04 gf'cmZcm ² or more. Claim 1 ~: The wiping cloth in any one of L1.

[13] The fabric according to any one of claims 1 to 12, wherein the fabric includes thick fine fibers of 2.5 decitex or more, and the boiling water shrinkage of the thick fine fibers is 10 to 25%. The wiping cloth described in crab.

14. The wiping cloth according to any one of claims 1 to 13, wherein the fabric is a knitted fabric.

15. The wiping cloth according to claim 14, wherein the knitted fabric is a circular knitting.