WO2015098902A1 - トナークリーニング用シートおよびその製造方法 - Google Patents
トナークリーニング用シートおよびその製造方法 Download PDFInfo
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- WO2015098902A1 WO2015098902A1 PCT/JP2014/084026 JP2014084026W WO2015098902A1 WO 2015098902 A1 WO2015098902 A1 WO 2015098902A1 JP 2014084026 W JP2014084026 W JP 2014084026W WO 2015098902 A1 WO2015098902 A1 WO 2015098902A1
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- fiber
- cleaning sheet
- toner cleaning
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- fibers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/005—Synthetic yarns or filaments
- D04H3/009—Condensation or reaction polymers
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
Definitions
- the present invention relates to a toner cleaning sheet for removing toner remaining on a fixing belt or the like of a copying machine and a method for manufacturing the same.
- an electric latent image is formed on a photosensitive drum, the obtained latent image is used as a toner image, the toner image is transferred to a transfer material such as paper, and then paper or the like.
- a transfer material such as paper, and then paper or the like.
- Such a copying machine transfers a toner image on a photosensitive drum obtained by development onto a transfer material, and then transfers the toner image between a fixing roller and a pressure roller that are pressed and rotated with each other. The material is passed and the toner image is fused to the transfer material by the heat and pressure of the fixing roller.
- the fixing roller includes a fixing belt, and residual toner that has not been fixed to the transfer material or paper powder as the transfer material adheres to the fixing belt, which may hinder the fixing of a new toner image. There is. Therefore, it is necessary to continuously clean the toner and paper dust adhering to the fixing belt. Further, even in a fixing roller that does not include a fixing belt, it is necessary to continuously clean the adhered toner and paper dust as described above.
- a toner cleaning sheet such as a nonwoven fabric wound around a roll is supplied, and the sheet and the fixing belt are placed between the toner cleaning heating roll and the pressure roller.
- the toner or paper dust adhered on the fixing belt is transferred to the sheet by passing through heat and pressure and the toner on the fixing belt is removed.
- toner cleaning sheet woven fabrics, knitted fabrics, and nonwoven fabrics using polyester fibers, nylon fibers, cellulose fibers, polyethylene fibers, polypropylene fibers, rayon fibers, vinylon fibers, pulp fibers, and the like are used (see Patent Document 1).
- the toner cleaning heating roller normally operates at a temperature of about 180 to 200 ° C.
- the toner cleaning sheet needs to have heat resistance at a temperature of about 180 to 200 ° C.
- the temperature of the heating roller for toner cleaning is rapidly increased to a predetermined temperature, and thus the predetermined temperature is instantaneously exceeded (ie, overshooted) at 230 ° C. Reach temperatures around. Therefore, the toner cleaning sheet is required to maintain strength against instantaneous heating at a temperature of about 230 ° C.
- the cleaning property is excellent in this application, the length of the toner cleaning sheet to be put in the copying machine can be shortened, and the space can be saved (that is, the copying machine can be downsized). Is also required to be excellent.
- An aramid fiber is a synthetic fiber in which an amide bond (—NHOC—) combines an aromatic ring such as a benzene ring to form a polymer polyamide, and is also called an aromatic polyamide.
- —NHOC— an amide bond
- meta-aramid fibers are excellent in heat resistance.
- the toner cleaning sheet using the meta-aramid fiber as described in Patent Document 3 has a problem that the cost is high and it is difficult to obtain the raw material.
- the object of the present invention is to improve the above-mentioned problems of the prior art, have excellent heat resistance, and have excellent durability with little reduction in heat tensile breaking strength even when there is a temperature overshoot of the heating roller for toner cleaning.
- Another object is to provide an inexpensive toner cleaning sheet that is excellent in cleaning properties.
- the present invention is to solve the above problems, and the method for producing a toner cleaning sheet according to the present invention is at least selected from thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher.
- a method for producing a toner cleaning sheet comprising one type of fiber and at least one type of fiber selected from cellulose fibers, wherein at least a part of the thermoplastic fiber is fused, and adjacent thermoplastic fiber
- thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher and at least selected from cellulose fibers.
- the above-described bonding step is performed after the fiber web forming step in which one type of fibers is arranged in a thin film to form a fiber web.
- the production of the toner cleaning sheet for performing the fiber web forming step and the bonding step is performed by a wet papermaking method.
- the wet papermaking method performs the step of creating a wet nonwoven fabric
- the step of heat-pressing the created wet nonwoven fabric is performed.
- the step of producing the wet nonwoven fabric includes at least one kind selected from thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher.
- a step of producing a thermoplastic fiber slurry in which fibers are dispersed in water a step of producing a cellulose fiber slurry in which at least one type of fiber selected from cellulose fibers is dispersed in water, and mixing both the above-mentioned slurries
- the heat and pressure treatment is to heat and pressure the wet nonwoven fabric with a calendering machine and / or a heat press.
- the toner cleaning sheet of the present invention comprises at least one type of fiber selected from thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher and at least one type of fiber selected from cellulose fibers. And a toner cleaning sheet in which at least a part of the thermoplastic fiber is fused and bonded to an adjacent thermoplastic fiber.
- the cellulose fiber is a wood pulp fiber.
- the thermoplastic fiber includes both a drawn yarn and an undrawn yarn.
- the drawn yarn is a polyphenylene sulfide drawn yarn
- the undrawn yarn is a polyphenylene sulfide undrawn yarn
- the use ratio of at least one kind of fiber selected from the thermoplastic fibers and at least one kind of fiber selected from cellulose fibers is 8 by mass ratio. : 2 to 2: 8.
- the use ratio of the polyphenylene sulfide stretched yarn and the polyphenylene sulfide unstretched yarn is 7: 3 to 3: 7 by mass ratio. .
- the present invention has long-term heat resistance against the use environment temperature (180 to 200 ° C.) and heat resistance against instantaneous high-temperature heating (230 ° C.) due to the temperature overshoot of the heating roller for toner cleaning.
- a toner cleaning sheet that is excellent in cleaning properties, inexpensive, and can be stably supplied can be obtained.
- FIG. 1 is a drawing-substituting photograph illustrating a toner cleaning sheet of the present invention.
- the toner cleaning sheet according to the present invention is characterized by at least one fiber selected from thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher, and at least one fiber selected from cellulose fibers. And at least a part of the thermoplastic fiber is fused and bonded to the adjacent fiber.
- thermoplastic fiber composed of a thermoplastic resin having a melting point of 265 ° C. or higher has a sufficiently high melting point with respect to the use temperature of the toner cleaning sheet of 180 to 200 ° C. Sufficient use strength is maintained even when exposed to.
- fusing point should just be 265 degreeC or more, there exists a tendency for a raw material and manufacturing cost to become high, so that melting
- the melting point refers to the melting point in the second temperature rising process as measured by a differential scanning calorimeter.
- a fiber sample is sealed in a differential scanning calorimeter (for example, DSC-60 manufactured by Shimadzu Corporation), heated at a rate of 10 ° C./min from 20 ° C. to 320 ° C. in a nitrogen atmosphere, and then liquid. Rapid cooling is performed using nitrogen, and the temperature is increased again from 20 ° C. to 320 ° C. at a rate of 10 ° C./min in a nitrogen atmosphere.
- the temperature indicated by the main endothermic peak observed in the second temperature raising process is measured and defined as the melting point.
- thermoplastic fiber composed of a thermoplastic resin having a melting point of 265 ° C. or higher
- thermoplastic resin having a melting point of 265 ° C. or higher
- examples of the thermoplastic fiber composed of a thermoplastic resin having a melting point of 265 ° C. or higher include, for example, polyphenylene sulfide fiber (hereinafter sometimes referred to as PPS fiber, melting point 285 ° C.), polytetrafluoroethylene fiber (hereinafter referred to as “polytetrafluoroethylene fiber”).
- PPS fiber polyphenylene sulfide fiber
- polytetrafluoroethylene fiber hereinafter referred to as “polytetrafluoroethylene fiber”.
- PTFE fiber melting point 327 ° C.
- ETFE fiber ethylene / tetrafluoroethylene copolymer fiber
- LCP fiber liquid crystal polyester fiber
- PEN fiber Polyethylene naphthalate fiber
- PEEK fiber polyether ether ketone fiber
- TFT fiber melting point 334 ° C.
- triacetate fiber Preferably the fibers are selected from the group, these are 1 It can be used in more.
- PPS fibers particularly excellent in strength and heat resistance can be preferably used.
- PPS fibers include “Torcon” (registered trademark) manufactured by Toray, “Toyoflon” (registered trademark) manufactured by Toray as PTFE fiber, Kureha synthetic fiber as ETFE fiber, and “Zexion” manufactured by KB Seiren as LCP fiber.
- PTFE fiber registered trademark
- PEN fiber include “Teonex” (registered trademark) manufactured by Teijin, and all of them are available as commercial products.
- thermoplastic fiber is fused and bonded to the adjacent thermoplastic fiber, so that the strength of the sheet can be increased and the fused thermoplastic fiber has a gap between the fibers.
- the surface of the sheet becomes smooth, so that the area in contact with the fixing belt at the time of cleaning is widened, and a sheet having excellent cleaning properties can be obtained.
- FIG. 1 is a drawing-substituting photograph illustrating the toner cleaning sheet of the present invention, and shows that at least a part of the thermoplastic fiber is fused and bonded to the adjacent thermoplastic fiber.
- thermoplastic fiber composed of a thermoplastic resin having a melting point of 265 ° C. or higher as described above
- thermoplastic fiber composed of a thermoplastic resin having a melting point of 265 ° C. or higher as described above
- the toner cleaning sheet of the present invention contains cellulose fibers, which are non-melting and have excellent instantaneous heat resistance and dimensional stability. Therefore, when used in combination with the above thermoplastic fibers, Sufficient strength is maintained even when the ambient temperature exceeds the operating temperature due to overshoot of the heating roller.
- the use ratio of the thermoplastic fiber and cellulose fiber is preferably in the range of 9: 1 to 1: 9, more preferably in the range of 8: 2 to 2: 8, and even more preferably 7 :
- the range is from 3 to 3: 7.
- the cellulose fibers used in the present invention are roughly classified into natural fibers and regenerated fibers, and any of them can be used in the present invention. These cellulose fibers are generally non-melting, are not softened by heating, are excellent in dimensional stability, and the combined use of cellulose fibers with thermoplastic fibers improves the heat resistance of the resulting sheet.
- wood pulp such as kraft pulp, mechanical pulp, and waste paper pulp
- non-wood pulp such as sisal hemp, manila hemp, sugar cane, cotton, silk, bamboo, and kenaf.
- wood pulp it is preferable to use wood pulp because it has physical properties such as paper strength and dimensional stability, and is easily available and inexpensive.
- bleached kraft pulp such as softwood bleached kraft pulp, hardwood bleached kraft pulp, unbleached kraft pulp such as softwood unbleached kraft pulp, hardwood unbleached kraft pulp, softwood half bleached Semi-bleached kraft pulp such as kraft pulp, hardwood semi-bleached kraft pulp, coniferous sulfite kraft pulp, and sulfite kraft pulp such as hardwood sulfite kraft pulp
- mechanical pulp for example, stone ground pulp, pressurized stone ground pulp, refiner ground pulp, chemi ground pulp, thermo ground pulp, ground pulp, thermo mechanical pulp, chemi thermo mechanical pulp, refiner mechanical pulp, etc. are used. can do.
- waste paper pulp for example, waste paper produced from newspaper waste paper, magazine waste paper, cardboard waste paper, tea waste paper, craft envelope waste paper, flyer waste paper, office waste paper, upper white waste paper, Kent waste paper, structured waste paper, waste paper waste paper, etc.
- Waste paper pulp, deinked waste paper pulp, disaggregation / deinked waste paper pulp, deinked / bleached waste paper pulp, and the like can be used.
- various wood pulps can be used, but it is preferable that the fibers are flexible because kraft pulp does not contain a hard resin such as lignin.
- kraft pulp When kraft pulp is used, only one of softwood kraft pulp and hardwood kraft pulp can be used, or both can be mixed and used.
- Softwood kraft pulp has a softer and longer fiber than hardwood kraft pulp, and therefore is easily entangled with other fibers, and is suitable for improving paper strength.
- hardwood kraft pulp has a shorter fiber length than softwood kraft pulp, so it is inferior in entanglement with other fibers, but has the effect of filling gaps between fibers and improving the yield of fine fibers, improving cleaning properties It is suitable for aiming at.
- examples of the regenerated fiber include fibers such as rayon, polynosic, cupra, and lyocell.
- Commercially available recycled fibers include Daiwabo Rayon Rayon and Asahi Kasei Cupra Fiber “Bemberg” (registered trademark).
- the thermoplastic fiber preferably includes both drawn yarn and undrawn yarn.
- the drawn yarn has a high degree of crystallinity and is not easily softened by heat and pressure treatment, but has excellent heat resistance and generally excellent strength.
- the tensile strength of the drawn yarn is preferably as high as possible, but is preferably 2 to 10 N / dtex, and more preferably 3 to 10 N / dtex, for example.
- the mass ratio of the drawn yarn to the undrawn yarn is preferably 9: 1 to 1: 9, more preferably 8: 2 to 2: 8, and 3: 7 to 7: 3. Is more preferable.
- undrawn yarns are softened at a lower temperature than drawn yarns. Therefore, a mixture of drawn yarns and undrawn yarns is used, and heat and pressure treatment is performed at a temperature at which the undrawn yarns can be fused and the drawn yarns are not softened. By doing so, only the undrawn yarn can be softened and bonded to adjacent fibers, and a sheet excellent in both heat resistance and cleaning properties can be obtained.
- the drawn yarn and the undrawn yarn may be obtained from different thermoplastic resins, but it is preferable that both have a common skeleton from the viewpoint of fusibility.
- the thermoplastic fiber is preferably a PPS fiber from the viewpoint of heat resistance.
- the drawn yarn is a polyphenylene sulfide drawn yarn
- the undrawn yarn is polyphenylene sulfide.
- An undrawn yarn is preferred.
- the PPS fiber is a synthetic fiber made of a polymer having (—C 6 H 4 —S—) as a main polymer structural unit, and has excellent heat resistance.
- Typical examples of PPS polymers include polyphenylene sulfide, polyphenylene sulfide sulfone, polyphenylene sulfide ketone, random copolymers thereof, block copolymers, and mixtures thereof.
- the method for producing a toner cleaning sheet according to the present invention basically includes a step of forming a fiber web by arranging fibers in a thin film and a step of bonding the formed fiber web.
- Examples of the method for forming the fibrous web include a carding method that is formed by mechanically combing, an airlaid method that is randomly formed using an air stream, and a molten thermoplastic polymer compound that is formed while continuously discharged.
- Examples of the spun bond method and the spun bond method include a melt blow method in which fine fibers are formed while applying high-temperature air, and a wet paper making method in which very short fibers are mixed with water to form the paper.
- a wet papermaking method is suitable. According to the wet papermaking method, there is little variation in the basis weight of the sheet, and the surface of the sheet is smooth, so that the sheet is stably excellent in cleaning properties.
- the bonding method of the formed fiber web includes a thermal bond method (heat bond method) in which fibers are bonded by heat, a resin bond method (chemical bond method) in which fibers are bonded with an impregnated or sprayed adhesive, Examples thereof include a needle punch method in which a certain needle is pierced and the fibers are mechanically bonded, and a water jet method (spun lace method) in which fibers are entangled using a high-pressure water stream.
- the preparation of a toner cleaning sheet by a wet papermaking method that is preferably used involves dispersing at least one fiber selected from thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or higher in water.
- a step of preparing a thermoplastic fiber slurry a step of preparing a cellulose fiber slurry in which at least one type of fiber selected from non-meltable cellulose fibers is dispersed in water, and mixing both the above-mentioned slurries and A process of making a paper with a paper machine using the obtained mixed slurry, then drying to form a wet nonwoven fabric, and a process of heating and pressurizing the prepared wet nonwoven fabric with a calendering machine or a heat press machine. It can be divided roughly.
- thermoplastic fiber slurry used in the wet papermaking method is a mixture of thermoplastic fibers composed of a thermoplastic resin having a melting point of 265 ° C. or more and water.
- the thermoplastic fibers and water composed of the thermoplastic resin are mixed with water. Is preferably in the range of 1: 100 to 10: 100, more preferably in the range of 1: 100 to 5: 100, and particularly preferably in the range of 1: 100 to 2: 100. It is.
- a dispersing agent, a viscosity modifier, an antifoamer, etc. can also be added to this thermoplastic fiber slurry as needed.
- thermoplastic fiber used in the thermoplastic fiber slurry preferably has a fiber length in the range of 2 to 38 mm, and more preferably 2 to 20 mm. When the fiber length is within the above range, it is possible to uniformly disperse with the stock solution for papermaking, and the wet nonwoven fabric after papermaking has sufficient tensile strength.
- the thickness of the thermoplastic fiber is preferably in the range of 0.1 to 10.0 dtex because the fiber can be uniformly dispersed in the stock solution for papermaking without agglomeration.
- the single fiber fineness is more preferably 0.5 to 10.0 dtex, still more preferably 1.0 to 6.0 dtex.
- the cellulose fiber slurry used in the present invention is a mixture of non-meltable cellulose fibers in water, and the ratio of cellulose fibers to water used is in the range of 1: 100 to 10: 100 by mass ratio. Is preferable, more preferably in the range of 1: 100 to 5: 100, and particularly preferably in the range of 2: 100 to 4: 100.
- a dispersing agent, a viscosity modifier, an antifoaming agent, etc. can also be added to this cellulose fiber slurry as needed.
- the fiber length of the cellulose fiber used in the cellulose fiber slurry is preferably in the range of 1 to 38 mm. If the fiber length is in the range of 1 to 38 mm, it can be uniformly dispersed in the stock solution for papermaking, and the wet nonwoven fabric after papermaking has sufficient tensile strength.
- the fiber thickness is preferably in the range of 0.1 to 10.0 dtex since the fibers can be uniformly dispersed in the stock solution for papermaking without agglomeration.
- the fiber length is preferably 4 to 20 mm, more preferably 5 to 10 mm.
- the natural fibers are generally beaten with a beating equipment such as SDR (single disc refiner), DDR (double disc refiner) and Niagara beater, and then made into a slurry.
- a beating equipment such as SDR (single disc refiner), DDR (double disc refiner) and Niagara beater
- the degree of beating is preferably carried out until the Canadian Standard Freeness (CSF) measured according to JIS P 811-2 (2012 edition) reaches 50 to 600 cc.
- CSF Canadian Standard Freeness
- a mixed slurry can be obtained by mixing and stirring the thermoplastic fiber slurry and the cellulose fiber slurry.
- the mixing ratio of the thermoplastic fiber slurry and the cellulose fiber slurry can be appropriately set in consideration of the characteristics of the target sheet.
- Paper is made from a mixed slurry containing a thermoplastic fiber slurry and a cellulose fiber slurry to obtain a wet paper.
- Any paper machine having a general structure can be employed without any problem.
- a circular paper machine, a long paper machine, a short paper machine, or a paper machine that is a combination of any of these paper machines can be used.
- a dryer part attached to the paper machine can be used, for example, a step of drying by a rotating drum such as a Yankee dryer or a multi-cylinder dryer can be used.
- the drying temperature of the rotating drum is preferably 90 ° C. to 130 ° C., whereby moisture can be efficiently removed.
- a preferred method for producing the toner cleaning sheet of the present invention is to perform heat and pressure treatment with a calendar device after moisture is removed by drying.
- the calendar device is formed of two or more pairs of rolls and has heating and pressurizing means.
- the material of the roll metal, paper, rubber and the like can be appropriately selected and used.
- a roll of metal such as iron is preferably used. .
- the heat and pressure treatment is performed under the condition that at least a part of the thermoplastic fiber can be fused and bonded to the adjacent fiber.
- the roll temperature is set high, fusion is possible even when the pressure is low, but when the roll temperature is set low, the roll can be fused by increasing the pressure.
- the preferable surface temperature of the roll is preferably in the range of 120 to 275 ° C.
- the surface temperature is less than 120 ° C.
- thermoplastic fibers having a melting point of 265 ° C. or more are hardly fused.
- the surface temperature is higher than 275 ° C.
- the thermoplastic fiber having a melting point of 265 ° C. or more may be greatly shrunk to impair the surface quality of the sheet.
- a linear pressure range of 100 to 8,000 N / cm is preferably employed.
- the thermoplastic fiber having a melting point of 265 ° C. or more constituting the surface of the sheet is fused, the gap between the fibers on the surface of the sheet is filled and smoothed, and excellent cleaning is performed.
- the use of the toner cleaning sheet of the present invention includes the use described in [Background Art].
- thermoplastic fiber PPS fiber having a melting point of 285 ° C. was used as the thermoplastic fiber having a melting point of 265 ° C. or higher.
- Cellulose fiber As the non-melting cellulose fiber, larch chip wood pulp fiber having a fiber length of about 3.0 to 5.0 mm and a width of about 50 ⁇ m was used.
- a Niagara beater manufactured by Kumagaya Riki Kogyo Co., Ltd. was used as a device for beating the wood pulp fibers.
- Dryer A rotary dryer (manufactured by Kumagai Riki Kogyo Co., Ltd.) was used in the process of drying the wet paper obtained with a hand-made paper machine to obtain dried paper.
- the PPS fiber was mixed with water so that the PPS fiber concentration was 0.5% by mass, and then stirred for 10 seconds with a domestic juicer mixer to prepare a PPS fiber slurry.
- Three types of PPS fiber slurries having a mass ratio of the stretched PPS fiber to the unstretched PPS fiber of 7: 3, 5: 5, and 3: 7 were prepared.
- the above-mentioned wood pulp fibers were mixed with water so that the wood pulp concentration was 0.5% by mass, and then beaten until the CSF became 350 cc to prepare a cellulose fiber slurry.
- Example 1 to 10 Comparative Examples 1 to 5
- Example 1 to 9 Comparative Examples 1 to 5
- the dried paper obtained as described above was peeled off from the filter paper, temperature 200 ° C., linear pressure 2,000 N / cm, and roll rotation speed.
- the sheet shown in Table 1 was obtained by heating and pressing through a calendering machine under conditions of 10 m / min.
- Example 10 the dried paper obtained as described above was peeled from the filter paper and calendered under conditions of a temperature of 275 ° C., a linear pressure of 2,000 N / cm, and a roll rotation speed of 10 m / min.
- the sheet shown in Table 1 was obtained by heating and pressing through a machine.
- CF represents cellulose fiber
- PPS1 represents stretched PPS fiber
- PPS2 represents unstretched PPS fiber
- CF: PPS1: PPS2 represents the mass ratio of each fiber constituting the sheet
- CF: (PPS1 + PPS2) represents cellulose fiber and PPS fiber (stretched PPS fiber and sheet) constituting the sheet.
- PPS1: PPS2 represents the mass ratio of the stretched PPS fiber and the unstretched PPS stretched fiber contained in the sheet.
- Weight per unit In accordance with JIS L 1906: 2000, one 25 cm ⁇ 25 cm test piece was sampled, and each mass (g) in a standard state was measured and expressed as a mass per 1 m 2 (g / m 2 ).
- Thickness According to JIS L 1096: 1999 applied mutatis mutandis according to JIS L 1906: 2000, using 10 mm thickness measuring machine to reduce the thickness under a pressure of 2 kPa with a 22 mm diameter pressurizer. After waiting for 10 seconds, the thickness was measured and the average value was calculated.
- Tensile strength In accordance with JIS P 8113 (2006 edition), the tensile strength (a) was measured using a tensile tester (AGS-J5kN manufactured by Shimadzu Corporation) at a test piece width of 15 mm, a test piece length of 180 mm, and a tensile speed of 200 mm / min. did. The test piece was collected so that the longitudinal direction of the test piece was the vertical direction of the sheet.
- Strength retention (%) b / a ⁇ 100 (4b)
- Strength retention rate-2 (strength retention rate at overshoot temperature): A sheet was sandwiched between a metal roll heated to 230 ° C. and a silicon rubber roll, and the metal roll was pressed at a pressure of 0.1 kgf / cm 2 for 1 minute, and then the tensile strength (c) was measured in the pressed state. The strength retention was determined from the following formula.
- the tensile strength was measured using a tensile tester (AGS-J5kN manufactured by Shimadzu Corporation) with a test piece width of 15 mm, a test piece length of 180 mm, and a tensile speed of 200 mm / min, in accordance with JIS P 8113 (2006 edition). Measured. The test piece was collected so that the longitudinal direction of the test piece was the vertical direction of the sheet.
- Dry heat shrinkage The dimensions of the weft dimension (d) after taking out the sheet from the dryer by heat-treating the sheet cut into dimensions of 200mm and 200mm in the hot air circulation dryer at 200 ° C for 15 minutes. It measured by mm and calculated
- Dry heat shrinkage (%) (200 ⁇ d) / 200 ⁇ 100 (6) Cleanability: After 5 g / m 2 of silicone oil (KF-965-10000cs, manufactured by Shin-Etsu Silicone) was applied to the sheet, it was mounted as a toner cleaning sheet on a commercially available copying machine (manufactured by Fuji Xerox Co., Ltd.), and a solid black image was copied 50 times. . Next, the sheet was taken out, the density of the toner adhesion surface was visually observed, and the grades from grade 1 to grade 5 were judged on a contamination gray scale according to JIS L 0805 (2005 edition). The lower the rating number, the better the cleaning performance. All grades with a concentration of grade 1 or higher were classified as grade 1. As a toner, CT200244 manufactured by Fuji Xerox Co., Ltd. was used.
- Presence or absence of sheet surface fusion Fibers present within 0.14 mm 2 corresponding to the area of the test piece that can be displayed on one screen when the test piece is observed at a magnification of 300 times using a scanning electron microscope S-3500N manufactured by Hitachi High-Technologies Corporation Among them, “Yes” is indicated if there is one unclear part where the boundary line between adjacent fibers disappears, and “No” if not. What was observed was the surface that was in contact with the metal roll during the heat and pressure treatment.
- the toner cleaning sheets obtained in the examples of the present invention have superior toner cleaning performance and heat resistance compared to the sheets obtained in the comparative examples. Excellent performance.
- by including easily available and inexpensive cellulose fibers, low-cost and stable supply ability could be realized.
- the sheets obtained in Comparative Examples 3 to 5 were inferior in cleaning property because the fusion of the thermoplastic fibers could not be confirmed and the contact area with the fixing roll as the wiping partner was small. .
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Abstract
Description
本発明のトナークリーニング用シートの製造方法は、基本的に、繊維を薄い膜状に配置して繊維ウェブを形成する段階と、形成した繊維ウェブを結合する段階とで構成される。
本発明において、好適に使用される湿式抄紙法によるトナークリーニング用シートの作製は、融点が265℃以上の熱可塑性樹脂で構成される熱可塑性繊維から選ばれた少なくとも一種の繊維を水に分散させた熱可塑性繊維スラリーを作製する工程、非溶融性のセルロース繊維から選ばれた少なくとも一種類の繊維を水に分散させたセルロース繊維スラリーを作製する工程、前記の両スラリーを混合して混合スラリーとする工程、得られた混合スラリーを用いて抄紙機で抄紙した後、乾燥し湿式不織布とする工程、および作製した前記の湿式不織布をカレンダー加工機や熱プレス機で加熱加圧処理する工程、に大別することができる。
湿式抄紙法で用いられる熱可塑性繊維スラリーは、融点が265℃以上の熱可塑性樹脂で構成される熱可塑性繊維を水に混合させたものであり、熱可塑性樹脂で構成される熱可塑性繊維と水の使用割合は、質量比で1:100~10:100の範囲とすることが好ましく、より好ましくは1:100~5:100の範囲であり、特に好ましくは1:100~2:100の範囲である。また、この熱可塑性繊維スラリーには、必要に応じて、分散剤や粘度調整剤や消泡剤等を添加することもできる。
本発明で用いられるセルロース繊維スラリーは、非溶融性のセルロース繊維を水に混合させたものであり、セルロース繊維と水の使用割合は、質量比で1:100~10:100の範囲とすることが好ましく、より好ましくは1:100~5:100の範囲であり、特に好ましくは2:100~4:100の範囲である。このセルロース繊維スラリーには、必要に応じて分散剤や粘度調整剤や消泡剤等を添加することもできる。
上記の熱可塑性繊維スラリーとセルロース繊維スラリーとを混合し攪拌することにより、混合スラリーを得ることができる。熱可塑性繊維スラリーとセルロース繊維スラリーの混合割合は、目的とするシートの特性を考慮し、適宜、設定することができる。
熱可塑性繊維スラリーとセルロース繊維スラリーとを含む混合スラリーを抄紙して、湿紙を得る。抄紙機は一般的な構造のものであれば問題なく採用することができる。例えば、円網抄紙機、長網抄紙機および短網抄紙機や、これらの抄紙機のいずれかをコンビネーションした抄紙機を用いることができる。
得られた湿紙の水分を乾燥除去する際は、抄紙機に付属するドライヤーパートを用いることができ、例えば、ヤンキードライヤーや多筒式ドライヤーのような回転ドラムによって乾燥する工程を用いることができる。回転ドラムの乾燥温度は、好ましくは90℃~130℃とすることにより水分を効率良く除去することができる。
本発明のトナークリーニング用シートの好ましい製造方法は、水分を乾燥除去した後にカレンダー装置で加熱加圧処理を行うことである。カレンダー装置は、2本のロールが1対以上で形成され、加熱と加圧手段を有するものである。また、ロールの材質としては、金属、ペーパーおよびゴムなどを適宜選択して用いることができるが、シートの表面の微細な毛羽を減少させるためには、鉄などの金属のロールが好適に用いられる。
融点が265℃以上の熱可塑性繊維として融点が285℃のPPS繊維を用いた。
延伸されたPPS繊維として、単繊維繊度が1.0dtexで、カット長が6mmの東レ社製“トルコン”(登録商標)、品番S301を用いた。
未延伸のPPS繊維として、単繊維繊度が3.0dtexで、カット長が6mmの東レ社製“トルコン”(登録商標)、品番S111を用いた。
非溶融性のセルロース繊維として、繊維長約3.0~5.0mm、幅約50μmのカラマツチップの木材パルプ繊維を用いた。
木材パルプ繊維を叩解する装置として、ナイヤガラビーター(熊谷理機工業社製)を用いた。
底に140メッシュの手漉き抄紙網を設置した大きさが25cm×25cmで、高さが40cmの手漉き抄紙機(熊谷理機工業社製)を用いた。
手漉き抄紙機で得られた湿紙を乾燥させ、乾燥した紙とする工程で、ロータリー式乾燥機(熊谷理機工業社製)を使用した。
乾燥した紙を加熱加圧する工程で、金属ロールとペーパーロールとからなるカレンダー加工機(由利ロール社製)を使用した。
前記のPPS繊維を用いて、PPS繊維濃度が0.5質量%となるように水と混合した後、家庭用ジューサーミキサーで10秒間撹拌し、PPS繊維スラリーを作製した。前記の延伸PPS繊維と未伸延PPS繊維の質量比が7:3、5:5、および3:7の3種類のPPS繊維スラリーを準備した。
実施例1~9および比較例1~5については、前記のようにして得られた乾燥処理したペーパーを、濾紙から剥離して、温度200℃、線圧2,000N/cm、およびロール回転速度10m/分の条件下でカレンダー加工機に通して加熱加圧処理を施し、表1のシートを得た。
各特性の測定と評価方法は、次のとおりである。
JIS L 1906:2000に準じて、25cm×25cmの試験片を、1枚採取し、標準状態におけるそれぞれの質量(g)を量り、1m2当たりの質量(g/m2)で表した。
JIS L 1906:2000で準用するJIS L 1096:1999に準じて、試料の異なる10か所について、厚さ測定機を用いて、直径22mmの加圧子による2kPaの加圧下、厚さを落ち着かせるために10秒間待った後に厚さを測定し、平均値を算出した。
JIS P 8113(2006年版)に準じて、試験片幅15mm、試験片長180mm、引張速度200mm/分で、引張試験機(島津製作所社製AGS-J5kN)を使用して引張強度(a)を測定した。試験片の長手方向が、シートのたて方向となるように試験片を採取した。
シートを200℃の温度の熱風循環型乾燥機の中で4.5時間静置する方法で熱処理を行い、乾燥機から取り出した後の引張強度(b)を測定し、下記式から強度保持率を求めた。なお、引張強度の測定は、JIS P 8113(2006年版)に準じて、試験片幅15mm、試験片長180mm、引張速度200mm/分で、引張り試験機(島津製作所社製AGS-J5kN)を使用して測定した。試験片の長手方向が、シートのたて方向となるように試験片を採取した。
(4b)強度保持率-2(オーバーシュート温度での強度保持率):
230℃に加熱した金属ロールとシリコンゴムロールの間にシートを挟み、前記金属ロールを圧力0.1kgf/cm2で1分間押し当てた後、押し当てた状態のまま引張強度(c)を測定し、下記式から強度保持率を求めた。なお、引張強度の測定は、JIS P 8113(2006年版)に準じて、試験片幅15mm、試験片長180mm、引張速度200mm/分で、引張り試験機(島津製作所社製AGS-J5kN)を使用して測定した。試験片の長手方向が、シートのたて方向となるように試験片を採取した。
(5)乾熱収縮率:
たて200mm、よこ200mmの寸法にカットしたシートを200℃の温度の熱風循環型乾燥機の中で15分間静置する方法で熱処理し、乾燥機から取り出した後のよこ寸法(d)を単位mmで測定し、下記式から乾熱収縮率を求めた。
(6)クリーニング性:
シートにシリコーンオイル(信越シリコーン社製 KF-965-10000cs)を5g/m2塗布した後、市販の複写機(冨士ゼロックス社製)にトナークリーニングシートとして装着し、黒ベタ画像を50回複写した。次いで、シートを取り出し、トナー付着面の濃度を目視観察し、JIS L 0805(2005年版)に準じた汚染用グレースケールで1級~5級までの等級を判定した。等級の数字が低いもの程、クリーニング性が優れることとなる。1級以上の濃度のものは全て1級とした。トナーは冨士ゼロックス社製CT200564を使用した。
日立ハイテクノロジーズ社製の走査型電子顕微鏡S-3500Nを用いて、試験片を倍率300倍で観察したとき、1画面中に表示できる試験片の面積に相当する0.14mm2内に存在する繊維のうち、隣り合う繊維との境界線が消えて不明瞭である部分が一カ所でもあれば「有」、なければ「無」とした。観察したのは加熱加圧処理で金属ロールに接触していた面である。
繊維サンプルを約2mgを秤量し、アルミニウム製パンとパンカバーを用いて封入し、示差走査熱量計(島津製作所社製 DSC-60)によって測定する。測定においては、窒素雰囲気中で20℃から320℃の温度まで10℃/分の速度で昇温した後、液体窒素を用いて急冷し、再び窒素雰囲気中で20℃から320℃の温度まで10℃/分の速度で昇温した。この2度目の昇温過程で観察される主吸熱ピークが示す温度を測定し、融点とした。
Claims (12)
- 融点が265℃以上の熱可塑性樹脂から構成される熱可塑性繊維から選ばれた少なくとも一種類の繊維とセルロース繊維から選ばれた少なくとも一種類の繊維とを含むトナークリーニング用シートの製造方法であって、前記熱可塑性繊維の少なくとも一部を融着させて、隣接する熱可塑性繊維と結合させる結合工程を行うことを特徴とするトナークリーニング用シートの製造方法。
- 融点が265℃以上の熱可塑性樹脂から構成される熱可塑性繊維から選ばれた少なくとも一種類の繊維とセルロース繊維から選ばれた少なくとも一種類の繊維を薄い膜状に配置して繊維ウェブを形成する繊維ウェブ形成工程の後、結合工程を行うことを特徴とする請求項1記載のトナークリーニング用シートの製造方法。
- 繊維ウェブ形成工程および結合工程を行なうトナークリーニング用シートの製造が、湿式抄紙法により行われることを特徴とする請求項1記載のトナークリーニング用シートの製造方法。
- 湿式抄紙法が湿式不織布を作成する工程を行った後、作成した湿式不織布を加熱加圧処理する工程を行う請求項3記載のトナークリーニング用シートの製造方法。
- 湿式不織布を作成する工程が、融点が265℃以上の熱可塑性樹脂で構成される熱可塑性繊維から選ばれる少なくとも一種の繊維を水に分散させた熱可塑性繊維スラリーを作製する工程、セルロース繊維から選ばれる少なくとも一種類の繊維を水に分散させたセルロース繊維スラリーを作製する工程、前記両スラリーを混合して混合スラリーとする工程、前記混合スラリーを用いて抄紙機で抄紙した後、乾燥し湿式不織布とする工程を行うことを特徴とする請求項3記載のトナークリーニング用シートの製造方法。
- 加熱加圧処理が、前記湿式不織布をカレンダー加工機および/または熱プレス機で加熱加圧処理することである請求項4または5記載のトナークリーニング用シートの製造方法。
- 融点が265℃以上の熱可塑性樹脂から構成される熱可塑性繊維から選ばれた少なくとも一種類の繊維とセルロース繊維から選ばれた少なくとも一種類の繊維とを含み、前記熱可塑性繊維の少なくとも一部が融着し、隣接する熱可塑性繊維と結合していることを特徴とするトナークリーニング用シート。
- セルロース繊維が木材パルプ繊維であることを特徴とする請求項7記載のトナークリーニング用シート。
- 熱可塑性繊維が、延伸糸と未延伸糸の両方を含むことを特徴とする請求項7または8記載のトナークリーニング用シート。
- 延伸糸がポリフェニレンサルファイド延伸糸であり、未延伸糸がポリフェニレンサルファイド未延伸糸であることを特徴とする請求項9記載のトナークリーニング用シート。
- 熱可塑性繊維から選ばれた少なくとも一種類の繊維とセルロース繊維から選ばれた少なくとも一種類の繊維との使用割合が、質量比率で8:2~2:8であることを特徴とする請求項7~10のいずれかに記載のトナークリーニング用シート。
- ポリフェ二レンサルファイド延伸糸とポリフェ二レンサルファイド未延伸糸との使用割合が、質量比率で7:3~3:7であることを特徴とする請求項11記載のトナークリーニング用シート。
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2014
- 2014-12-24 WO PCT/JP2014/084026 patent/WO2015098902A1/ja active Application Filing
- 2014-12-24 US US15/107,997 patent/US9834889B2/en not_active Expired - Fee Related
- 2014-12-24 KR KR1020167018826A patent/KR20160103028A/ko not_active Application Discontinuation
- 2014-12-24 CN CN201480071232.4A patent/CN105829975A/zh active Pending
- 2014-12-24 EP EP14873883.4A patent/EP3088966B1/en not_active Not-in-force
- 2014-12-24 JP JP2014561627A patent/JP6417944B2/ja active Active
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JPH05323819A (ja) * | 1992-05-18 | 1993-12-07 | Teijin Ltd | 複写機用クリーニングウエブ |
JPH07287496A (ja) | 1994-04-15 | 1995-10-31 | Teijin Ltd | 複写機クリーニング用ウエブ |
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JP2009028503A (ja) * | 2007-06-29 | 2009-02-12 | Toray Ind Inc | 清掃用シート材 |
JP2012127018A (ja) | 2010-12-15 | 2012-07-05 | Toray Ind Inc | ポリフェニレンサルファイド繊維からなるペーパーおよびその製造方法 |
JP2012132992A (ja) * | 2010-12-20 | 2012-07-12 | Mitsubishi Paper Mills Ltd | 電子写真装置用クリーニングシート基材 |
JP2012211990A (ja) * | 2011-03-31 | 2012-11-01 | Mitsubishi Paper Mills Ltd | 電子写真装置用クリーニングシート基材 |
JP2013148601A (ja) * | 2012-01-17 | 2013-08-01 | Mitsubishi Paper Mills Ltd | 電子写真装置用クリーニングシート基材 |
JP2014153654A (ja) * | 2013-02-13 | 2014-08-25 | Mitsubishi Paper Mills Ltd | 電子写真装置用クリーニングシート基材 |
JP2014222258A (ja) * | 2013-05-13 | 2014-11-27 | 三菱製紙株式会社 | 電子写真装置用クリーニングシート基材 |
Also Published As
Publication number | Publication date |
---|---|
EP3088966A1 (en) | 2016-11-02 |
CN105829975A (zh) | 2016-08-03 |
US9834889B2 (en) | 2017-12-05 |
JP6417944B2 (ja) | 2018-11-07 |
EP3088966B1 (en) | 2019-01-30 |
JPWO2015098902A1 (ja) | 2017-03-23 |
KR20160103028A (ko) | 2016-08-31 |
US20160319486A1 (en) | 2016-11-03 |
EP3088966A4 (en) | 2017-07-05 |
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