JP2006002265A - Conductive multi-fineness filament combined yarn and brush comprising the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to achieve the effect of high image quality due to a high pile density by combining filaments and the effect of improved cleanability due to the supply of tension and stiffness to piles, in conductive fibers used for electrophotographic recording method dry copying machines, facsimiles, printers, and the like. <P>SOLUTION: This conductive multi-fineness filament combined yarn comprising a multifilament comprising single filaments (A) and single filaments (B) having different finenesses, respectively, is characterized by the following characteristics. The conductive carbon contents of the single filaments (A) and the single filaments (B) are 10 to 40 wt. %, respectively. The fineness of the single filaments (A) is 2 to 8 dtex, and the fineness of the single filaments (B) is 1 to 5 dtex. The T(A)/T(B) ratio of the fineness of the single filaments (A) to the fineness of the single filaments (B) is 1.5 to 8. The fiber blending rate of the single filaments (A) and the single filaments (B) is 30 /70 to 70 / 30 wt. % per 100 wt. % of the total amount of the multifilaments. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a conductive different fineness mixed yarn used for a charging brush and a cleaner brush used in an electrophotographic recording type dry copying machine, a facsimile, a printer, and the like. Further, the present invention relates to a charging brush and a cleaner brush in which the conductive different fineness mixed yarn is used in an electrophotographic recording type dry copying machine, a facsimile, a printer, and the like.

Fibers used for developing brushes, contact charging brushes, and photosensitive drum cleaner brushes used in electrophotographic recording type dry copying machines, facsimiles, printers, etc. are required to have a specific resistance of 10 ³ to 10 ⁸ Ωcm. Has been. Conventionally, as described in Patent Documents 1 to 3, multifilaments containing conductive carbon fine particles in such applications have used cellulosic fibers and vinylon conductive yarns. Conventionally, cellulosic fibers and vinylon conductive yarns have a single yarn fineness of about 4 to 5 dtex, and the conductive yarn pile density when weaving is about 30,000 / inch ^{2 in} order to further improve image quality. A high pile density is desired when weaving. In addition, as a method for increasing the pile density, the fineness of single yarn fineness has been studied in recent years, but when used as a charging brush, good image quality is obtained, but as a brush for both charging and cleaning When it is used, there is a problem that the peel of the pile is lowered, and the toner remaining on the photosensitive member cannot be sufficiently removed to deteriorate the image quality.
JP-A-9-491117 (paragraph [0007]) JP 2000-355823 A (paragraphs [0002] to [0003]) Japanese Unexamined Patent Publication No. 2000-160427 (paragraph [0003])

Accordingly, the present invention relates to a conductive conductive fine fiber mixed yarn having conductivity and a brush comprising the same used for electrophotographic recording type dry copying machines, facsimiles, printers, and the like. It is an object of the present invention to achieve both the high image quality due to the conversion and the double-sided effect of improving the cleaning property by giving the pile a firmness with the same brush.

In order to solve the above-described problems, the conductive heterogeneity mixed yarn of the present invention mainly has the following configuration. That is,
(1) A multifilament composed of single yarn (A) and single yarn (B) having different finenesses,
The ratio T (A) / T (B) of the fineness T (A) of the single yarn (A) and the fineness T (B) of the single yarn (B) is 1.5 to 8,
The conductive carbon content of the single yarn (A) and the single yarn (B) is 10 to 40% by weight,
The fineness T (A) of the single yarn (A) is 2 to 8 dtex,
The fineness T (B) of the single yarn (B) is 1 to 5 dtex,
And the blending rate of the single yarn (A) and the single yarn (B) is 30% by weight / 70% by weight to 70% by weight / 30% by weight with the whole multifilament as 100% by weight.
Conductive heterogeneity mixed yarn characterized by being.
(2) The conductive different fineness mixed yarn according to (1), wherein the conductive different fineness mixed yarn is a polyamide fiber.
(3) The conductive different fineness mixed yarn according to (1) or (2), wherein the single yarn (A) is a deformed yarn.
(4) A brush using the conductive different fineness mixed yarn according to any one of (1) to (3), and as a charging brush and / or a cleaner brush, an electrophotographic recording type dry copying machine, a facsimile Or a brush used for a printer.

  The present invention is a conductive mixed fine yarn composed of single yarns having different single yarn fineness. By forming a multifilament with single yarns having different single yarn fineness, the fine fineness yarn contributes to an improvement in pile density and image quality. The high-definition yarn gives the pile a firmness and improves the cleaning performance. The conductive different-fineness mixed yarn of the present invention is used as an electrification-type dry copying machine, facsimile, printer, etc. Particularly suitable for cleaner brushes.

  The conductive different fineness mixed yarn of the present invention is a fiber composed of a single yarn (A) and a single yarn (B) having different single yarn fineness. The above two types of single yarns are mixed to give the pile a firmness and improve the cleaning performance. At the same time, the current density is increased to increase the charge density on the photoconductor. Alternatively, details can be clearly copied, and the resolution of the printed image can be increased to obtain high image quality.

  Ratio T (A) / T (B) of the fineness T (A) of the single yarn (A) and the fineness T (B) of the single yarn (B) (hereinafter referred to as single yarn) The fineness ratio) needs to be 1.5-8. When the single yarn fineness ratio is less than 1.5, the single yarn (A) and the single yarn (B) are mixed to produce a brush. In other words, it becomes difficult to sufficiently remove the toner, resulting in problems such as deterioration in cleaning properties, reduction in density, and deterioration in resolution of a printed image. When the single yarn fineness ratio exceeds 8, the single yarn (A) gives sufficient pile strength to the pile, but the pile density is lowered and high-quality printing cannot be obtained. In addition, the pile becomes hard and may cause scratches on the photoreceptor. The single yarn fineness is the fineness of individual single yarns constituting the multifilament, and is represented by the weight (g) of individual values of single yarn per 10,000 m. The method for measuring the single yarn fineness can be calculated using a denier computer.

  The conductive heterogeneity mixed yarn of the present invention needs to contain 10 to 40% by weight, more preferably 20 to 30% by weight of conductive carbon in the single yarn (A) and the single yarn (B). . Here, the content of the conductive carbon is determined with the total weight of the single yarn (A) and the single yarn (B) being 100% by weight. When the conductive carbon content is 10% by weight or less, the specific resistance value of the fiber becomes too high, and there is a problem that printing cannot be performed because charging cannot be performed when printing is attempted. On the other hand, if the conductive carbon content exceeds 40% by weight, the strength of the fiber is lowered, the practicality is lacking, and the cost is increased.

  The conductive different fineness mixed yarn of the present invention is a different fineness mixed fiber in which the whole multifilament is 100% by weight and the single yarn (A) is 30 to 70% by weight and the single yarn (B) is 70 to 30% by weight. It must be a thread.

  If the blending rate of the single yarn (A) is less than 30% by weight, the pile density of the single yarn (B) is increased and a high-quality product can be obtained when the brush is prepared. Getting worse. If the single yarn (A) exceeds 70% by weight, the pile density of the single yarn (B) is lowered when a brush is prepared, and high-quality printing cannot be obtained. The single yarn (A) is preferably 35 to 55% by weight and the single yarn (B) is 45 to 65% by weight.

  Fineness T (A) of the single yarn (A) and fineness T (B) of the single yarn (A) constituting the conductive different fineness mixed yarn of the present invention (hereinafter referred to as single yarn fineness) It is necessary that the single yarn (A) T (A) is 2 to 8 dtex (decitex) and the single yarn (B) T (B) is 1 to 5 dtex (decitex). When the single yarn fineness T (A) of the single yarn (A) is less than 2 dtex (decitex), the pile cannot be given sufficient elasticity, and the cleaning property is deteriorated. On the other hand, when the single yarn fineness exceeds 8 dtex (decitex), the pile becomes hard, which causes a scratch on the photosensitive member on the upper part of the brush. When the single yarn fineness T (B) of the single yarn (B) is less than 1 dtex (decitex), the single yarn becomes too thin, so that the yarn breakage during yarn production, single breakage in the drawing process, and fluff are likely to occur and stable productivity. Cannot be obtained. On the other hand, if the single yarn fineness exceeds 5 dtex (decitex), the pile density when the brush is prepared is lowered, and the resolution of the printed image is deteriorated.

  It is preferable to use a modified cross-sectional yarn for the single yarn (A) constituting the conductive different fineness mixed yarn of the present invention. By using a modified cross-section yarn for the single yarn (A), the single yarn (A) becomes highly amorphous during spinning and drawing, and the specific resistance value is higher than that of the single yarn (B). As a result, charging is positively performed with the single yarn (B) having a high pile density, and high-quality printing is possible. In addition, when tailored to a brush, the single yarn (A) is an irregular cross-sectional yarn, so it has strong sharpness and good cleaning properties, and the amorphous orientation is higher than the single yarn (B), so the single yarn (B The shrinkage rate is higher than that in the case of (1), and when the brush is used, the single yarn (B) comes out at the tip of the brush due to the shrinkage difference of the single yarn due to heat setting, and high-quality printing is possible. It is preferable to use a modified cross-sectional yarn for the single yarn (A) constituting the conductive different fineness mixed yarn of the present invention. The modified cross-section yarn only needs to have a non-circular cross-section in the direction perpendicular to the fiber axis. Those are preferred.

  Examples of the polymer constituting the conductive heterogeneity mixed yarn of the present invention include polyolefins such as cellulose, vinylon, polyethylene, and polypropylene, polyester, nylon, and the like. Nylon 6 and nylon 66 are preferred from the standpoints of flexibility and operability during spinning.

    The conductive carbon used in the present invention is not particularly limited as long as it is a conductive powder such as acetylene black. However, the increase in filtration pressure during spinning, yarn breakage during spinning, and improvement in fiber strength are not particularly limited. In consideration of the above, it is preferable to use those having an average particle size of 20 μm or less and a carbon content of 20 to 40% by weight. Alternatively, conductive carbon particles in a dispersion-mixed nylon pellet may already be used by a pigment maker, such as “Carborex NYRON YT-01” manufactured by Dainippon Ink and Chemicals, Inc.

  As a method of adding conductive carbon to single yarn (A) and single yarn (B), a method of blending conductive carbon into pellets and melting, and a method of blending master pellets containing a high concentration of conductive carbon into pellets. Examples thereof include a melting method, a method of adding conductive carbon to a molten polymer and kneading, and a method of kneading a polymer containing a high concentration of conductive carbon in a molten state to a molten polymer.

  The conductive heterogeneity mixed yarn of the present invention may contain various additives as long as the effects of the present invention are not impaired. Examples of this additive include stabilizers such as manganese compounds, plasticizers, lubricants, flame retardants, fibrous reinforcing agents, antioxidants, and light resistance agents.

The specific resistance value (temperature 20 ° C., humidity 30% RH) of the conductive heterogeneity mixed yarn of the present invention is preferably 10 ³ to 10 ⁸ Ωcm. When the specific resistance value is less than 10 ³ Ωcm, when a voltage is applied as a conductive brush, there is a problem that electrons move to adjacent conductive yarns and the photosensitive member cannot be uniformly charged. This is because if the specific resistance value exceeds 10 ⁸ Ωcm, there may be a problem that even if a voltage is applied, electrons cannot move into the fiber and copying cannot be performed.

  As a method for mixing conductive yarns with different sizes of conductive fibers, a method of mixing drawn yarns with a twister or interlace when making drawn yarns into a brush or a method of spinning and mixing at the time of melt spinning are generally used. The method of blending the conductive heterogeneity blended yarns is preferably a method using spinning blending during melt spinning. In the production method of single yarn (A) and single yarn (B), the raw material polymer is melted by a separate spinning machine, and the polymer is discharged from the discharge holes, followed by cooling, and then The single yarn (A) and the single yarn (B) are combined at the time of refueling, and the undrawn yarn is wound once at a speed of 1000 m / min or less. The wound undrawn yarn is drawn about 1.5 to 4 times by a drawing machine. By performing fiber mixing at the time of yarn production, the dispersibility of the filament is improved, and the effect of reducing the variation in specific resistance value and the processing cost can be reduced. In addition, there is a method of melting and discharging from the same die using a composite spinning machine, but there is a problem that it is lacking in versatility and cost because it becomes a dedicated die.

  The electrophotographic recording type dry copying machine brush using the conductive different fineness mixed yarn of the present invention is an application brush for contact charging to the photosensitive member in place of non-contact corona discharge, and a charge remaining on the photosensitive member. And a cleaning brush for removing toner, and a charging / cleaning brush having charging and cleaning performance. After weaving as a pile, after backing with a conductive backing agent, a pile tape cut to a width of 10 to 30 mm is wound around a cylindrical metal bar around a bias, or simply a pile fabric is pasted on a plate to form a brush It is obtained by tailoring.

Hereinafter, the present invention will be described in detail with reference to examples. The evaluation method is as follows.

A. Specific resistance value The conductive yarn wound by stretching is cut into a sample length of 10 cm and fixed to an acrylic plate. Subsequently, using a super insulation resistance meter (TERAOHMMETER R-503, manufactured by Kawaguchi Electric Co., Ltd.), a voltage of 100 (V) was applied to measure the electrical resistance value (Ω / cm) under the conditions of a temperature of 20 ° C. and a humidity of 30% RH. Then, it was calculated from the following formula (1) (measurement was performed 10 times and the average value was calculated). Table 1 shows the logarithmic value log ₁₀ (RS / Ωcm) of the specific resistance RS.
RS = R × D / (10 × L × SG) × 10- 5 (1)
RS: Specific resistance (Ωcm)
R: Electric resistance value (Ω)
D: Yarn weight per 10000 m (g)
L: Test length (cm)
SG: Yarn density (g / cm ³ ).

B. Spinning yarn breakage The number of yarn breakage when conducting conductive yarns with different degree of different fineness and spinning 1t of undrawn yarn at a winding speed of 800 m / min was evaluated according to the following criteria.
A: Less than 2 times / t ○: Less than 3 times / t Δ: 3-5 times / t or less x: 5 times / t or more.

C. Image quality The brush is incorporated into the copier as a charging brush and cleaner brush, and a test chart (No1R) issued by the Electrophotographic Society is copied. An average of 7 or more was regarded as a passing level.

D. Changes in image quality during long-term use Compare the image quality of the test chart issued by the Electrophotographic Society with the first copy and the one after 20,000 copies, and perform sensory evaluation on 10 people according to the following criteria It was.
2 points: No difference 1 point: Some differences are seen 0 points: Differences are seen Based on the total score of 10 people, classification was made according to the following criteria.
：: 18 to 20 points ○: 15 to 17 points Δ: 10 to 14 points ×: 0 to 9 points.

E. Single yarn fineness measurement method Using a motorcycle blow type fineness measuring device (Denier Computer) manufactured by Search Corporation, the measurement sample length is 50 mm, and the load is the measurement sample fineness (denier equivalent) x 0.1 g. After confirming that the vibration frequency was stabilized by applying vibration, the total number of filaments of the measurement sample was measured and evaluated.

F. Measuring method of blending rate Using the above-mentioned single yarn fineness measuring method, using the conductive different fineness blended yarn after drawing, the single yarns (A) and (B) are obtained, and the fineness and fineness are calculated. . The ratio of thick fineness (A) and fine fineness (B) when the total fineness (decitex) is determined by measuring 10,000 m using the same fiber and the total fineness is 100% by weight.

G. Measurement method of carbon content 100 mg of carbon slurry of known concentration (CARBOREX NYLON YT-01) is thoroughly reviewed, 100 ml of PEA solution is added, and carbon is completely dispersed with a shaker to prepare a stock solution, and a finol / ethanol mixture solution = 80 / 20 (hereinafter referred to as PEA solution). Next, the absorbance with respect to the PEA solution is measured at a wavelength of 610 nm using a spectrophotometer, and a calibration curve is prepared by taking absorbance on the vertical axis and mg / 50 ml of carbon concentration on the horizontal axis. Subsequently, 1 g of the measurement sample is put in a plastic bottle and dried in a vacuum dryer under an environment of 35 ° C. for 16 hours. 0.0250 g of the dried sample is weighed and 50 ml of PEA solution is added, and then dissolved in a greenhouse for 1 hour using a shaker. Using a spectrophotometer after dissolution by shaking, the absorbance is measured three times per sample at a wavelength of 610 nm using the PEA solution as a control solution, and the average is calculated. Next, the carbon amount is obtained from the calibration curve obtained first.

Example 1
Nylon 6 having a relative viscosity of 2.0 was kneaded with a conductive furnace black having an average particle size of 35 μm so that the addition amount was 25% by weight. Next, the kneaded pellets are respectively put into two spinning machines and melted at 270 ° C., and the mixed yarns after conductive fiber mixing have a total fineness of 170 dtex, a single yarn fineness ratio of 2.7, and a blending rate of 40. / Decite 68 decitex 12 filaments (single yarn (A)) using a round hole cap with a hole diameter of 0.3 mm so as to be 60% by weight, and at the same time use 102 dtex with a round hole cap with a hole diameter of 0.25 mm. After discharging 48 filaments (single yarn (B)) and cooling them, before supplying the oil, the single yarn (A) and the single yarn (B) are mixed and an oil supply roller using a hydrous oil having a concentration of 10% by weight is used. The undrawn yarn was wound at a rotation speed of 11 rpm, a touch length of 11 cm, and a take-up speed of 800 m / min. Subsequently, after aging the undrawn yarn for 48 hours in an environment of a drawing room temperature of 25 ° C. and an absolute humidity of 16.6 g / m ³ , a drawing roller feed roller speed of 200 m / min, a hot plate temperature of 170 ° C., a drawing roller speed Drawing was performed at 500 m / min. After weaving using the obtained mixed yarn of different fineness of conductive yarn so that the pile density was 1000 / inch and the pile length was 7 mm, it was treated with hot water in a 90 ° C. hot water bath and dried to finish the pile. . Next, after making the pile into a tape with a width of 15 mm, a brush was created by spirally winding it on a cylindrical surface with a diameter of 6 mm, and the created brush was attached to a copying machine to evaluate the pile quality and longevity. We investigated changes in image quality during use.

Example 2
Nylon 6 having a relative viscosity of 2.0 was kneaded with conductive furnace black having an average particle size of 35 μm so that the addition amount was 40 wt% and 10 wt%. A single yarn (A) -side spinning machine is charged with 40% by weight of conductive furnace black added pellets, and a single yarn (B) -side spinning machine is charged with 10% by weight of conductive furnace black added to the spinning building. In the same manner as in Example 1 except that this was done, a brush was prepared using the conductive different fineness mixed yarn obtained by melt spinning and stretching, and the same evaluation was carried out.

Example 3
Nylon 6 having a relative viscosity of 2.0 was kneaded with conductive furnace black having an average particle size of 35 μm so that the addition amount was 40 wt% and 10 wt%. A single yarn (A) -side spinning machine is charged with 10% by weight of conductive furnace black and a single yarn (B) -side spinning machine is charged with 40% by weight of conductive furnace black. In the same manner as in Example 1 except that this was done, a brush was prepared using the conductive different fineness mixed yarn obtained by melt spinning and stretching, and the same evaluation was carried out.

Example 4
A 68 dtex 9 filament (single yarn (A)) is discharged using a round hole cap having a hole diameter of 0.3 mm so that the single yarn fineness ratio is 1.5, and at the same time, a round hole cap having a hole diameter of 0.25 mm is discharged. Except that it was used as 102 decitex 20 filaments (single yarn (B)), melt spinning and stretching were carried out in the same manner as in Example 1, and the resulting conductive different fineness mixed yarn was used to prepare a brush. A similar evaluation was performed.

Example 5
Using a round hole cap with a hole diameter of 0.3 mm so that the conductive yarns after mixing are 170 decitex, the single yarn fineness ratio is 7.9, and the blending ratio is 65/35 wt%, 110 decitex 14 filaments Then, melt spinning and stretching were performed in the same manner as in Example 1 except that a 60-dtex 60 filament was discharged using a round hole cap having a hole diameter of 0.15 mm and mixed. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

Example 6
Conductive heterogeneity mixed yarn after blending is 168 dtex, single yarn fineness ratio of 2 and a blending ratio of 55/45% by weight using a round hole cap of 0.2 mm diameter 92 dtex 46 filament, pore diameter 0 The melt spinning and stretching were performed in the same manner as in Example 1 except that a 15-mm round hole cap was used to discharge and mix to 76 dtex 76 filaments. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

Example 7
In Example 1, instead of using a round hole cap having a hole diameter of 0.3 mm, a 102 decitex 48 filament is used by using a die having a Y hole in which three slits having a slit width of 0.1 mm and a slit length of 0.4 mm are arranged radially. Except as described above, melt spinning and stretching were carried out in the same manner as in Example 1, and the obtained conductive heterogeneity mixed yarn was used as a brush, and the same evaluation was performed.

Example 8
Conductive furnace black having an average particle size of 35 μm was kneaded into nylon 66 having a relative viscosity of 2.5 so as to give an addition amount of 25% by weight to form a pellet. Next, except that the kneaded pellets were put into two spinning buildings and melted at 290 ° C., the same evaluation was made using a conductive different fineness mixed yarn obtained by stretching in the same manner as in Example 1 and the same evaluation. Carried out.

Comparative Example 1
Nylon 6 having a relative viscosity of 2.0 was kneaded with conductive furnace black having an average particle size of 35 μm so that the addition amount was 5 wt% and 40 wt%. A single yarn (A) spinning machine is loaded with pellets with a conductive furnace black addition of 5% by weight, and a single yarn (B) spinning machine is filled with pellets with a conductive furnace black addition of 40% by weight. Except for the above, melt spinning and stretching were carried out in the same manner as in Example 1, and the same evaluation was carried out by tailoring the brush using the obtained conductive different fineness mixed yarn.

Comparative Example 2
Nylon 6 having a relative viscosity of 2.0 was kneaded with conductive furnace black having an average particle size of 35 μm so that the addition amount was 5 wt% and 40 wt%. A single yarn (A) side spinning machine is charged with 40% by weight conductive furnace black pellets, and a single yarn (B) side spinning machine is charged with 5% conductive furnace black additive pellets. Except for the above, melt spinning and stretching were carried out in the same manner as in Example 1, and the same evaluation was carried out by tailoring the brush using the obtained conductive different fineness mixed yarn.

Comparative Example 3
68 decitex 8 filaments using a round hole cap with a hole diameter of 0.3 mm so that the mixed yarn after mixing is 170 decitex, the single yarn fineness ratio is 4.3, and the blending ratio is 40/60% by weight, Melt spinning and stretching were carried out in the same manner as in Example 1 except that a round hole cap having a hole diameter of 0.25 mm was discharged so as to be 102 dtex 50 filament and mixed. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

Comparative Example 4
68 decitex 7 filaments using a round hole cap with a hole diameter of 0.3 mm so that the mixed yarn after mixing is 170 decitex, the single yarn fineness ratio is 1.1, and the blending ratio is 40/60% by weight. Melt spinning and stretching were carried out in the same manner as in Example 1 except that a round hole cap having a hole diameter of 0.25 mm was discharged to 102 decitex 11 filaments and mixed. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

Comparative Example 5
68 decitex 34 filaments using a round hole cap with a hole diameter of 0.3 mm so that the mixed yarn after mixing is 170 decitex, the single yarn fineness ratio is 2.5, and the blending ratio is 40/60% by weight. Melt spinning was carried out in the same manner as in Example 1 except that a round hole cap having a hole diameter of 0.13 mm was used to discharge to 102 decitex 128 filaments.

Comparative Example 6
34 decitex 6 filaments using a round hole cap with a hole diameter of 0.3 mm so that the conductive yarn after mixing is 170 decitex, the single yarn fineness ratio is 2.7, and the blending ratio is 20/80% by weight. Melt spinning and stretching were carried out in the same manner as in Example 1 except that a round hole cap having a hole diameter of 0.2 mm was discharged into a 136 dtex 68 filament and mixed. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

Comparative Example 7
136 decitex 24 filaments using a round hole cap with a hole diameter of 0.3 mm so that the mixed yarn after mixing is 170 decitex, the single yarn fineness ratio is 2.7, and the blending ratio is 80/20% by weight. Melt spinning and stretching were carried out in the same manner as in Example 1 except that a round hole cap having a fine fineness (B) of 0.3 mm was discharged and mixed into 34 dtex 17 filaments and mixed. The obtained conductive different fineness mixed yarn was used to make a brush and the same evaluation was performed.

表１、表２の結果から明らかなように、本発明の導電性異繊度混繊糸およびブラシは電子写真記録方式の乾式複写機やファクシミリ、プリンター等の高画質印刷に極めて顕著な効果を奏することがわかる。

As is apparent from the results in Tables 1 and 2, the conductive heterogeneity mixed yarn and brush of the present invention have a very remarkable effect on high-quality printing of electrophotographic recording type dry copying machines, facsimiles, printers, and the like. I understand that.

Claims (4)

A multifilament composed of single yarn (A) and single yarn (B) having different fineness,
The ratio T (A) / T (B) of the fineness T (A) of the single yarn (A) and the fineness T (B) of the single yarn (B) is 1.5 to 8,
The conductive carbon content of the single yarn (A) and the single yarn (B) is 10 to 40% by weight,
The fineness T (A) of the single yarn (A) is 2 to 8 dtex,
The fineness T (B) of the single yarn (B) is 1 to 5 dtex,
And the blending rate of the single yarn (A) and the single yarn (B) is 30% by weight / 70% by weight to 70% by weight / 30% by weight with the whole multifilament as 100% by weight.
Conductive heterogeneity mixed yarn characterized by being. The conductive different fineness mixed yarn according to claim 1, wherein the conductive different fineness mixed yarn is a polyamide fiber. 3. The conductive different fineness mixed yarn according to claim 1 or 2, wherein the single yarn (A) is a modified cross-sectional yarn. A brush using the conductive different fineness mixed yarn according to any one of claims 1 to 3, wherein the brush is used as a charging and cleaner brush in an electrophotographic recording type dry copying machine, a facsimile, or a printer. A brush characterized by being used.