WO2017199874A1 - Corps élastique et son procédé de production - Google Patents

Corps élastique et son procédé de production Download PDF

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Publication number
WO2017199874A1
WO2017199874A1 PCT/JP2017/018029 JP2017018029W WO2017199874A1 WO 2017199874 A1 WO2017199874 A1 WO 2017199874A1 JP 2017018029 W JP2017018029 W JP 2017018029W WO 2017199874 A1 WO2017199874 A1 WO 2017199874A1
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WO
WIPO (PCT)
Prior art keywords
elastic body
molding
tape
polyurethane
molding groove
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PCT/JP2017/018029
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English (en)
Japanese (ja)
Inventor
康範 見方
勇太 中嶋
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バンドー化学株式会社
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Priority to JP2017553450A priority Critical patent/JPWO2017199874A1/ja
Publication of WO2017199874A1 publication Critical patent/WO2017199874A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
    • B29C41/30—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length incorporating preformed parts or layers, e.g. moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/36—Feeding the material on to the mould, core or other substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • 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
    • 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 an elastic body used for a blade of an electrophotographic apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine of these.
  • various blades such as a cleaning blade that scrapes off excess toner and a developing blade that uniformizes the thickness of toner in the developing unit are used.
  • the blade is composed of an elastic body and a support member.
  • thermosetting polyurethane having appropriate hardness and elasticity is used as the elastic body.
  • the life of each member has been increasing in an electrophotographic apparatus, and the elastic body is required to have improved wear resistance.
  • the elastic body is also required to contribute to a long life of the entire system, such as prevention of filming (adhesion) of toner and external additives to the photosensitive drum and reduction of wear of the photosensitive drum.
  • the elastic body is required to have a low coefficient of friction.
  • Patent Document 1 discloses that the edge portion and the base portion (backup portion) are formed of polyurethanes having different materials, and only the edge portion is high. An elastic body having hardness has been proposed.
  • Patent Document 2 discloses an elastic material in which only an image bearing member contact portion (edge portion) of an elastic body made of a single polyurethane is impregnated with an isocyanate compound, and only the contact portion with the image bearing member is hardened. The body has been proposed. However, the elastic bodies proposed in Patent Documents 1 and 2 have a limit in increasing the hardness because polyurethane is used for the edge portion.
  • An object of the present invention is to provide a blade having a low friction coefficient at an edge portion.
  • the tape-shaped substrate is made of any one of ultra high molecular weight polyethylene, fluororesin, polyether ether ketone, polyimide, polyphenylene sulfide, and polyethylene terephthalate. Or 2.
  • the molding groove is covered with an endless belt that rotates in synchronization with the rotation of the molding drum while the molding drum is rotated, and the polyurethane composition is cured in a cavity formed by the molding groove and the endless belt.
  • manufacturing the belt-like elastic body Cutting the strip elastic body; A method for producing an elastic body having an edge portion made of a tape-like base material and a backup portion made of polyurethane. 6).
  • the molding groove is covered with an endless belt that rotates in synchronization with the rotation of the molding drum while the molding drum is rotated, and the polyurethane composition is cured in a cavity formed by the molding groove and the endless belt.
  • manufacturing the belt-like elastic body Cutting the strip elastic body;
  • the elastic body which has the edge part which consists of a tape-shaped base material manufactured by the manufacturing method which has these, and the backup part which consists of polyurethane.
  • the edge portion is made of a tape-like substrate, and the friction coefficient of the edge portion can be set to a low value that cannot be achieved with polyurethane.
  • the backup portion is made of conventionally used polyurethane. Therefore, the elastic body of the present invention is highly reliable and has excellent cleaning properties while being in contact with the photoreceptor at a pressure equivalent to that of a conventional elastic body. Since the elastic body of the present invention has a low coefficient of friction at the edge portion, it can be suitably used for low-melting-point toners and fine toners that have been used in recent years.
  • the elastic body of the present invention has a longer life compared to a conventional elastic body, and can further extend the life of the photoconductor in contact with the elastic body.
  • the tape-shaped substrate having a thickness of 3 ⁇ m or more and 500 ⁇ m or less has sufficient flexibility and can follow the deformation of the backup part, and thus is difficult to peel off from the backup part. Moreover, it is excellent also in the handleability at the time of manufacture. Further, the wear resistance can be further improved by using any one of ultra high molecular weight polyethylene, fluororesin, polyether ether ketone, polyimide, polyphenylene sulfide, and polyethylene terephthalate as the tape-like substrate.
  • the elastic body of the present invention can be continuously manufactured by using a forming drum having a forming groove on the outer periphery, and is excellent in productivity.
  • Schematic view from above of the forming drum during elastic body manufacturing The figure which shows a mode that a sheet-like elastic body is cut
  • FIG. 1 shows a structural example of the elastic body of the present invention.
  • the elastic body 1 which is one structural example includes an edge portion 11 made of a tape-like substrate and a backup portion 12 made of polyurethane.
  • the edge part 11 consists of a tape-shaped base material, and has higher hardness and lower friction than polyurethane.
  • the backup part 12 consists of polyurethane, and has moderate elasticity as an elastic body.
  • the width of the elastic body of the present invention is about 5 mm to 20 mm, and the thickness is about 1 mm to 3 mm.
  • the length of the elastic body is appropriately selected according to the width of the photosensitive drum to be contacted, that is, the width of the paper to be printed, but is about 220 mm when A4 size paper is used. Moreover, it is preferable that an edge part and a backup part have a different color so that it can distinguish at a glance.
  • the edge portion 11 is made of a tape-like base material, is provided along one side in the length direction of the elastic body 1, and constitutes one corner in the cross section in the thickness direction of the elastic body 1.
  • the elastic body 1 is in contact with the photosensitive drum at a side or surface formed by the edge portion 11.
  • the edge portion can be provided on the entire width direction of the elastic body.
  • the tape-shaped substrate constituting the edge portion is not particularly limited as long as it has a lower friction coefficient than polyurethane.
  • ultrahigh molecular weight polyethylene UHMWPE
  • polytetrafluoroethylene PTFE
  • tetrafluoroethylene Fluororesin such as perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), tetrafluoroethylene / ethylene copolymer (ETFE), polyacetal resin (POM), polyamide resin ( PA, polyimide (PI), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polycarbonate (PC) and the like can be suitably used.
  • UHMWPE ultrahigh molecular weight polyethylene
  • PTFE polytetrafluoroethylene
  • Fluororesin such as perfluoroalkyl vinyl
  • ultra high molecular weight polyethylene polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, which are particularly excellent in wear resistance.
  • Fluorine resins such as polymers, polyether ether ketone, polyimide, polyphenylene sulfide, and polyethylene terephthalate are preferable.
  • the ultra-high molecular weight polyethylene is a polyethylene having a weight average molecular weight increased to 1 million or more, and is commercially available, for example, under the trade names Dyneema (Ran DSM) and Spectra (Honeywell).
  • the thickness of the tape-shaped substrate is preferably thin, preferably 500 ⁇ m or less, more preferably 300 ⁇ m or less, further preferably 100 ⁇ m or less, and most preferably 50 ⁇ m or less.
  • the lower limit of the thickness of the tape-shaped substrate is not particularly limited, but it may be 3 ⁇ m or more from the viewpoint of handleability during production.
  • the thickness of the tape-like substrate with respect to the thickness of the entire elastic body is preferably 50% or less, and preferably 30% or less. More preferably, it is 10% or less, more preferably 5% or less.
  • the width of the tape-shaped substrate is not particularly limited, but generally, the narrower the width, the cheaper the width, and the narrower the width, the better.
  • the width of the tape-shaped substrate is preferably 2 mm or more from the viewpoint of handleability during production.
  • the edge part of an elastic body consists of a tape-shaped base material, the thickness and width
  • the tape-like base material is preferably subjected to a surface treatment for improving the adhesiveness with the polyurethane constituting the backup portion.
  • the surface treatment method is not particularly limited, and examples thereof include flame treatment, corona treatment, plasma treatment, UV treatment, ozone treatment, chemical treatment, and roughening treatment.
  • the backup unit 12 is made of polyurethane.
  • the polyurethane is obtained by reacting a polyurethane composition containing a polyol and a polyisocyanate.
  • the back-up portion is a portion that presses the edge portion against the photosensitive drum with an appropriate pressure and makes contact with the elasticity of polyurethane.
  • the thickness of the backup part (when the edge part is provided in a part in the width direction of the elastic body is equal to the thickness of the elastic body) is within a range in which an appropriate stiffness can be given to the elastic body. Usually, it is about 500 ⁇ m or more and 3 mm or less.
  • Polyol Polyols include polyoxyalkylene glycols such as polyethylene glycol, polypropylene glycol and polyoxytetramethylene glycol, or polyether-type polyols of alkylene oxide adducts such as bisphenol A and glycerin ethylene oxide and propylene oxide; adipic acid Reaction of dibasic acids such as phthalic anhydride, isophthalic acid, maleic acid and fumaric acid with glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol and trimethylolpropane Polyester-type polyols obtained by the following: polycaprolactone diols; polycarbonate diols and the like. Among these, polyether type polyols having less viscoelastic environmental dependency are preferable.
  • Polyisocyanate examples include metaxylene diisocyanate (XDI), tolylene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 1,4-cyclohexane diisocyanate, and the like. Can be mentioned.
  • XDI metaxylene diisocyanate
  • TDI tolylene diisocyanate
  • MDI 4,4-diphenylmethane diisocyanate
  • HDI hexamethylene diisocyanate
  • IPDI isophorone diisocyanate
  • 1,4-cyclohexane diisocyanate 1,4-cyclohexane diisocyanate
  • the equivalent ratio of OH group / NCO group is preferably 0.80 or more and 1.10 or less, more preferably 0.90 or more and 1.05 or less, from the physical properties of the polyurethane to be produced.
  • a crosslinking agent chain extender
  • surfactant flame retardant
  • colorant filler
  • plasticizer plasticizer
  • stabilizer mold release agent
  • catalyst etc.
  • An agent can be blended.
  • a conductive agent and an abrasive can be blended.
  • crosslinking agent examples include low molecular weight diols such as ethylene glycol, 1,4-butanediol, diethylene glycol, 1,6-hexanediol, and neopentyl glycol, and diamines such as ethylenediamine, hexamethylenediamine, and isophoronediamine. Can be mentioned. Desirably, a low molecular weight diol is used.
  • triamines such as trimethylolpropane and glycerol, triamines such as triethanolamine, and these ethylene oxide and propylene oxide adducts can be added as polyfunctional components as necessary.
  • reaction accelerators such as a general amine compound and an organic tin type compound, can be used as needed.
  • examples thereof include imidazole derivatives disclosed in Japanese Patent No. 2942183 and paragraphs 0022 to 0023. Specific examples thereof include 2-methylimidazole and 1,2-dimethylimidazole which are highly dependent on reaction temperature in terms of chemical structure.
  • the reaction accelerator is preferably used in a range of 0.001 part by weight to 0.5 part by weight with respect to a total of 100 parts by weight of polyol and polyisocyanate, and 0.01 part by weight or more and 0.3 part by weight or less. It is more preferable to use within a range.
  • reaction accelerator those having temperature sensitivity or slow-acting property prevent the urethane resin composition mixed with the reaction accelerator from being cured before molding, can extend the pot life, and the demolding time. Is preferable because of shortening. Specifically, 1,8-diazabicyclo (5,4,0) undecene-7-organic acid salt, 1,5-diazabicyclo (4,3,0) nonene-5-organic acid salt called block amine Or a mixture thereof.
  • the elastic body of the present invention can be produced by a continuous molding method using a molding drum having a molding groove on the outer periphery, as described in detail below.
  • the time from when the polyurethane composition is cast into the molding groove of the molding drum until it is taken out as a belt-like elastic body is about 30 to 60 seconds when the molding drum rotates about half a half.
  • the composition of the polyurethane composition is designed by selecting a polyol, a polyisocyanate, a crosslinking agent, a catalyst, and the like so that the polyurethane composition is polymerized to such an extent that it can be removed from the molding drum in about 30 to 60 seconds.
  • FIG. 2 shows a configuration example of the blade of the present invention.
  • the blade 3 as an example of the configuration includes an elastic body 1 having an edge portion 11 made of a tape-like substrate and a backup portion 12 made of polyurethane, and a support member 2 joined to the elastic body 1.
  • the method for joining the elastic body and the support member is not particularly limited as long as it can be firmly joined, and an adhesive, a double-sided tape, or the like can be used.
  • the shape of the support member and the location where the elastic member is joined to the support member are not particularly limited, and can be appropriately designed according to the space around the photoreceptor where the blade is installed.
  • the elastic body of the present invention can be produced by a continuous molding method.
  • the method for producing the elastic body of the present invention by a continuous molding method 1.
  • the molding groove is covered with an endless belt that rotates in synchronization with the rotation of the molding drum while the molding drum is rotated, and the polyurethane composition is cured in a cavity formed by the molding groove and the endless belt.
  • manufacturing the belt-like elastic body 4). Cutting the strip elastic body; At least.
  • the molding apparatus 4 as one configuration example includes a molding drum 40, a feeding device 41 for feeding out the resin tape 411 in order along the rotation direction of the molding drum 40, a discharge port 42 for supplying a polyurethane composition, an external heating device 43, An endless belt 44 and the like are included.
  • the molding drum 40 includes molding grooves on the outer peripheral surface and an internal heating device (not shown) inside, and is rotated at a predetermined speed by a driving device (not shown).
  • the forming groove has a concave cross section carved at a predetermined depth corresponding to the thickness of the elastic body.
  • molding groove should just be more than the width
  • the internal heating device supplies heat for curing the polyurethane composition.
  • the internal heating device is not particularly limited, such as an electric heater, heating oil, steam or the like.
  • the heating temperature is determined by the polyurethane composition, the rotation speed, and the like, and is set, for example, in the range of 110 ° C. or higher and 150 ° C. or lower.
  • the feeding device 41 feeds the resin tape 411 into the forming groove.
  • the resin tape 411 is wound in a roll shape, and is fed out to the center in the width direction of the forming groove as the forming drum 40 rotates.
  • the feeding device 41 only needs to hold the roll-shaped resin tape 411 in a rotatable manner, and can be rotated in synchronization with the rotation of the molding drum 40.
  • the molding apparatus may be provided with a surface treatment apparatus (not shown) for performing surface treatment before the resin tape fed from the feeding apparatus reaches the molding drum.
  • the discharge port 42 continuously supplies a polyurethane composition in which each component is uniformly mixed to the forming groove with a constant discharge amount.
  • a resin tape 411 is fed out into the molding groove, and the polyurethane composition is discharged onto the resin tape 411.
  • the molding groove is heated by an internal heating device, and the polyurethane composition supplied to the molding groove starts a thermosetting reaction immediately after casting into the molding groove.
  • the external heating device 43 is provided as necessary.
  • the external heating device 43 heats the polyurethane composition cast into the forming groove from the discharge port 42 from the surface side, and promotes thermosetting on the surface side.
  • the cast polyurethane composition is prevented from flowing into the contact point between the molding drum 40 and the endless belt 44 by the thermosetting reaction progressing by the internal heating device and the external heating device 43 to increase the viscosity. .
  • liquidity of a polyurethane composition can be reduced rapidly, the band-shaped elastic body B to manufacture can be thickened and a molding speed can be raised.
  • the external heating device 43 a non-contact type far infrared ray, laser beam, ultraviolet ray, induction heating or the like can be used.
  • the heating temperature is adjusted by the reactivity and viscosity of the polyurethane composition, the production speed, the thickness of the elastic band B to be produced, the distance to the forming groove, and the like.
  • the installation position of the external heating device 43 can be adjusted between the discharge port 42 and the preheating roll 45 according to the reactivity of the polyurethane composition and the thickness of the elastic band B to be produced. In this configuration example, it is installed near the top of the forming drum 40.
  • the endless belt 44 covers approximately half of the outer periphery of the forming drum 40, and cools the preheating roll 45 that preheats the endless belt 44, the guide roll 46 that adjusts belt running, the tension roll 47 that applies tension, and the endless belt 44. It is wound around the cooling roll 48 and runs in synchronization with the rotation of the forming drum 40.
  • the endless belt 44 covers the molding groove of the molding drum 40, thereby forming a cavity filled with the polyurethane composition together with the molding groove. That is, the molding groove and the endless belt 44 have a function as a mold when the polyurethane composition is cured.
  • the endless belt 44 is heated by the preheating roll 45, and the temperature of the polyurethane composition is prevented from being lowered when contacting the endless belt 44.
  • the section in which the endless belt 44 covers the molding groove is not limited to about a half circumference of the outer periphery of the molding drum 40, and may be any section that is necessary for curing until the polyurethane composition can be peeled from the endless belt 44. Good.
  • FIG. 4 the schematic diagram which looked down at the forming drum 40 during elastic body manufacture from upper direction is shown.
  • the resin tape 411 is fed out to the center portion in the width direction of the molding groove 401 and wound around the rotation of the molding drum 40.
  • the polyurethane composition is supplied from above the resin tape 411 to the molding groove 401 and embeds the resin tape.
  • an endless belt (not shown) covers the molding groove, and the polyurethane composition is filled in a cavity formed by the molding groove 401 and the endless belt, and is thermoset in a state where the outer shape is adjusted, and the resin is formed.
  • the band-like elastic body B is obtained by integrating the tape 411 and polyurethane.
  • the cured elastic band B is peeled off from the endless belt 44 and the forming groove.
  • a cooling device 49 for cooling by blowing cool air or the like from the outside of the endless belt 44 can be installed as necessary.
  • the peeled strip-shaped elastic body B is cut in the length direction to form a sheet-shaped elastic body S.
  • the resin tape 411 becomes the edge part 11 which consists of a tape-shaped base material of the elastic body 1 by being cut
  • the blade 3 of the present invention is obtained by joining the obtained elastic body 1 and the support member 2 (FIG. 2).
  • the width of the molding groove is three times the width of the elastic body, two resin tapes are fed into the molding groove in parallel, and the obtained belt-like elastic body is divided into three in the width direction.
  • An elastic body can also be manufactured.
  • by cutting a band-shaped elastic body made using a resin tape having substantially the same width as the forming groove width into a plurality of pieces with a predetermined width an edge portion made of a tape-shaped substrate is formed on the entire width direction of the elastic body.
  • the elastic body provided can also be manufactured.
  • PCT / JP2014 / 071565 and two or more attachment reference structures are formed, and fitted to the machining reference structure of the blade support.
  • a jig that has a fitting structure that fits and can be mounted so that the elastic body joints face each other with two blade supports, and a blade receiving space is provided between the facing parts. Thereby, after joining a blade support body to the both sides of a sheet-like elastic body, it can also cut
  • Example 1 The elastic body of the present invention was produced by the continuous molding method described above.
  • resin tape an ultra high molecular weight polyethylene tape (manufactured by Nitto Denko Corporation, trade name: No. 440, width 5 mm, thickness 100 ⁇ m) was used.
  • Polytetramethylene ether glycol manufactured by Hodogaya Chemical Co., Ltd., trade name: PTG2000SN, number average molecular weight 2000 was dehydrated under reduced pressure at 110 ° C. for 2 hours.
  • the resin tape was fed out into the forming groove of the forming drum, and then the above mixed and stirred composition was supplied from the casting machine to the forming groove.
  • the supply amount was set so as to just fill the cavity formed by the forming groove and the endless belt.
  • the cavity cross-sectional dimensions were a width of 25 mm, a depth of 2 mm, a mold temperature of 140 ° C., and a crosslinking time of 45 seconds.
  • the obtained belt-like elastic body was cut to 232 mm in the length direction and then cut in the center in the width direction to obtain an elastic body having an edge portion made of a tape-like base material having a width of 2.5 mm and a thickness of 100 ⁇ m. .
  • the elastic body has a width of 12.5 mm and a thickness of 2 mm.
  • the elastic body and the support member were joined to manufacture the blade 1.
  • Example 2 A blade 2 was produced in the same manner as in Example 1 except that ETFE (manufactured by Asahi Glass Co., Ltd., trade name: Aflex, width 5 mm, thickness 100 ⁇ m) was used as the resin tape.
  • Comparative Example 1 A blade 3 was produced in the same manner as in Example 1 except that no resin tape was used.
  • Example 3 A blade 4 was produced in the same manner as in Example 1 except that PEEK (manufactured by Victrex (UK), trade name: APTIV film 1000 series, width 5 mm, thickness 50 ⁇ m) was used as the resin tape.
  • Example 4 Blade 5 was produced in the same manner as in Example 1 except that PI (manufactured by Toray DuPont, trade name: Kapton 200V, width 5 mm, thickness 50 ⁇ m) was used as the resin tape.
  • Example 5" A blade 6 was produced in the same manner as in Example 1 except that PPS (product name: Torelina, width 5 mm, thickness 50 ⁇ m) was used as the resin tape.
  • Example 6 A blade 7 was produced in the same manner as in Example 1 except that PET (trade name: Lumirror S10, width 5 mm, thickness 50 ⁇ m) was used as the resin tape.
  • Example 7 A blade 8 was produced in the same manner as in Example 1 except that an ultrahigh molecular weight polyethylene tape (manufactured by Nitto Denko Corporation, trade name: No. 440, width 5 mm, thickness 500 ⁇ m) was used as the resin tape. .
  • FIG. 6 the schematic diagram of a friction coefficient measurement test is shown.
  • a surface property measuring instrument manufactured by Shinto Kagaku Co., Ltd., device name: TYPE14
  • the edge portion of the elastic body 1 of the blades 1 to 8 is brought into contact with the PET film P placed on the flat plate at an angle of 25 degrees.
  • the load W was set to 100 g / cm.
  • a printing running test (30000 sheets) was conducted using the blades 1 to 8 as cleaning blades of a commercially available digital color multifunction peripheral (manufactured by Ricoh Co., Ltd., MP C2503).
  • the edge portion after the test was visually checked for wear and evaluated according to the following criteria. Further, occurrence of inconvenience due to the blade was visually confirmed in the printed matter and the charging roller after the test.
  • ⁇ Wear and chipping of 0.01 mm or less are observed at the edge portion.
  • ⁇ Abrasion and chipping of 0.03 mm or less are observed at the edge portion.
  • X Wear and chipping larger than 0.05 mm are observed at the edge portion.
  • Toner slipping ⁇ No slipping ⁇ : Through slipping • External additive slipping ⁇ : No charging roller contamination ⁇ : Charging roller uniformly thinly dirty ⁇ : Charging roller local contamination ⁇ : Fault image due to charging roller contamination Occurrence / toner filming ⁇ : No abnormal image due to filming ⁇ : Abnormal image due to filming appears partially faint ⁇ : Abnormal image due to filming appears faint ⁇ : Abnormal image due to filming is clearly visible
  • the blades of the present invention produced in Examples 1 to 7 had a low coefficient of friction, with the edge portion having a dynamic friction coefficient less than half that of the conventional polyurethane blade produced in Comparative Example 1.
  • the backup portion is made of conventionally used polyurethane, and is pressed against the photoreceptor by the elasticity of the polyurethane, so that the toner can be prevented from slipping through.
  • the blades of the present invention produced in Examples 1 to 7 since the edge portion had low friction, the external additive slipped out and toner filming was not observed. That is, the blade of the present invention can extend the life of the entire system including the photoreceptor to which the blade contacts.
  • the life of the blade itself can be remarkably increased as compared with the conventional blades.
  • the blades of the present invention manufactured in Examples 1 to 7 can prevent toner filming, they are suitable for use in low-melting-point toners and fine toners that are prone to toner filming.
  • the blade manufactured in Comparative Example 1 was confirmed to have an abnormal image due to toner filming and contamination of the charging roller. This is because the dynamic friction coefficient of the edge portion is large and heat is easily generated by frictional heat.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Cleaning In Electrography (AREA)
  • Laminated Bodies (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

La présente invention vise à proposer une lame présentant une partie de bord ayant un faible coefficient de frottement. A cet effet, l'invention concerne un corps élastique présentant une partie de bord formée à partir d'une base de type ruban et une partie de fixation formée à partir d'un polyuréthane.
PCT/JP2017/018029 2016-05-16 2017-05-12 Corps élastique et son procédé de production WO2017199874A1 (fr)

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JP2017553450A JPWO2017199874A1 (ja) 2016-05-16 2017-05-12 弾性体、及びその製造方法

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JP2016-097539 2016-05-16
JP2016097539 2016-05-16

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WO2017199874A1 true WO2017199874A1 (fr) 2017-11-23

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Citations (8)

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