JPWO2018235853A1 - Elastic body and method of manufacturing the same - Google Patents

Abstract

It is an object of the present invention to provide a blade having a low coefficient of friction at the contact portion. The elastic body is provided with a contact portion made of resin tape, a backup portion made of polyurethane and having a flat surface, and an adhesive layer for bonding the contact portion and the flat surface of the backup portion. Do.

Description

  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, and a composite machine of these.

2. Description of the Related Art In electrophotographic apparatuses such as copying machines and printers, various blades such as a cleaning blade for scraping excess toner and a developing blade for making the thickness of toner at a developing portion uniform are used. The blade is composed of an elastic body and a support member, and usually the elastic body is made of thermosetting polyurethane having appropriate hardness and elasticity.
In recent years, in the electrophotographic apparatus, the life extension of each member has been advanced, and the elastic body is required to improve the wear resistance. The elastic body is also required to contribute to prolonging the life of the entire system, such as preventing filming (sticking) of toner, external additive and the like to the photosensitive drum, and reducing wear of the photosensitive drum. In order to achieve these, the elastic body is required to have a low coefficient of friction.

In order to lower the coefficient of friction of the elastic body, the hardness may be increased. However, if the hardness of the entire blade is increased, the elastic modulus is increased and the pressure on the photosensitive drum is increased. In order to bring the elastic body having high hardness into contact with the photosensitive drum at an appropriate pressure, the degree of contact, etc. is limited, so the degree of freedom in design is narrowed. Therefore, a method of increasing the hardness of only the contact portion has been proposed. For example, in Patent Document 1, the edge portion (contact portion) and the base portion (backup portion) are formed of polyurethanes of different materials. An elastic body is proposed in which only the edge portion has high hardness. Further, Patent Document 2 proposes an elastic body in which only an image carrier contacting portion of an elastic body made of a single polyurethane is impregnated with an isocyanate compound, and only the contact portion with the image carrier is hardened. ing.
However, the elastic bodies proposed in Patent Documents 1 and 2 have a limit in increasing the hardness as long as polyurethane is used in the contact portion.

Patent No. 4818945 gazette JP 2005-156696 A

  An object of the present invention is to provide a blade having a low coefficient of friction of the contact portion.

The means for solving the problems of the present invention are as follows.
1. An abutment made of resin tape,
A backup section made of polyurethane and having a flat surface,
An adhesive layer for bonding the contact portion and the flat surface of the backup portion;
An elastic body characterized by having:
2. The elastic body according to 1, wherein the resin tape has a thickness of 3 μm to 500 μm.
3. The resin tape is made of any one of ultra high molecular weight polyethylene, fluorine resin, polyacetal, polyamide, polyimide, polyetheretherketone, polyphenylene sulfide, polyethylene terephthalate and polycarbonate. Or 2. The elastic body described in.
4.1. ~ 3. And the elastic body according to any one of
A support member joined to the elastic body,
A blade characterized by having.
5. Supplying a polyurethane composition to the forming groove while rotating a forming drum having a forming groove on an outer periphery thereof;
An endless belt that rotates in synchronization with the rotation of the forming drum covers the forming groove, and the polyurethane composition is cured in a cavity formed by the forming groove and the endless belt to form a strip polyurethane having a flat surface Manufacturing process,
Bonding the flat surface of the strip polyurethane and the wide resin tape with an adhesive to produce a strip elastic body;
Cutting the elastic band;
An elastic body having a contact portion made of a resin tape, a backup portion made of polyurethane and having a flat surface, and an adhesive layer bonding the contact portion and the flat surface of the backup portion Manufacturing method.

In the elastic body of the present invention, the contact portion is made of a resin tape, and the coefficient of friction of the contact portion can be made very low. Further, in the elastic body of the present invention, the backup portion is made of polyurethane conventionally used. Therefore, the elastic body of the present invention is highly reliable, can be in contact with the photosensitive member at a pressure equivalent to that of the conventional elastic body, and has a cleaning property superior to that of the conventional elastic body.
The elastic body of the present invention can be suitably used for low melting point toners and fine toners which have been widely used in recent years because the friction coefficient of the contact portion is low. Further, the elastic body of the present invention has a long life as compared with the conventional elastic body, and further, the life of the photosensitive member in contact with the elastic body can be extended.

The resin tape having a thickness of 3 μm or more and 500 μm or less has sufficient flexibility and can follow deformation of the backup portion, so it is difficult to be peeled off from the backup portion. Moreover, it is excellent in the handleability at the time of manufacture.
The abrasion resistance can be further improved by using any one of ultrahigh molecular weight polyethylene, fluorine resin, polyetheretherketone, polyimide, polyphenylene sulfide and polyethylene terephthalate as the resin tape.
The elastic body of the present invention can be manufactured continuously by using a forming drum provided with a forming groove on the outer periphery, and is excellent in productivity.

The figure which shows one embodiment of the elastic body of this invention. Fig. 2 shows an embodiment of the blade of the present invention. Schematic which shows one structural example of the shaping | molding apparatus used for a continuous shaping | molding method. The figure which shows cutting a sheet-like elastic body and setting it as the elastic body which is one embodiment of this invention. The schematic diagram of a friction coefficient measurement test.

1 Elastic body 11 contact part (resin tape)
12 backup section 121 flat surface 2 support member 3 blade

DESCRIPTION OF SYMBOLS 4 forming apparatus 401 forming drum 402 discharge port 403 external heating apparatus 404 endless belt 405 preheating roll 406 guide roll 407 tension roll 408 cooling roll 409 cooling apparatus 410 feeding apparatus 411 pressure contact roll

T Wide resin tape UB Belt-like polyurethane B Belt-like elastic body S Sheet-like elastic body

FIG. 1 shows an embodiment of the elastic body of the present invention.
The elastic body 1 according to one embodiment is an adhesive for bonding the contact portion 11 made of resin tape, the backup portion 12 made of polyurethane and having the flat surface 121, and the flat surface of the contact portion 11 and the backup portion 12 And a layer (not shown).
The contact portion 11 is made of resin tape and has lower friction than polyurethane used in the backup portion. Further, the backup portion 12 is made of polyurethane and has appropriate elasticity.

  The length (width) of the short side of the elastic body of the present invention is about 5 mm or more and 20 mm or less. The length of the long side of the elastic body is appropriately selected according to the width of the photosensitive drum in contact, that is, the width of the sheet to be printed, but is about 220 mm when A4 size paper is used. Moreover, it is preferable that the contact part and the backup part have different colors so that they can be distinguished at a glance.

"Abutment"
The contact portion 11 is made of a resin tape, and is provided along the long side on the flat surface 121 of the backup portion 12 via the adhesive layer. Then, the elastic body 1 contacts the photosensitive drum at the side or face of the contact portion 11.

  The resin tape constituting the contact portion is not particularly limited as long as the material has a friction coefficient lower than that of the polyurethane used in the backup portion. For example, ultra high molecular weight polyethylene (UHMWPE), polytetrafluoroethylene (PTFE), tetratetra Fluorine resin such as fluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), tetrafluoroethylene / ethylene copolymer (ETFE), polyacetal (POM), polyamide (PA), polyimide (PI), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), polycarbonate (PC) and the like can be suitably used. Among these, fluorine resins such as ultra high molecular weight polyethylene, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer, tetrafluoroethylene / hexafluoropropylene copolymer, tetrafluoroethylene / ethylene copolymer, etc. Polyether ether ketone, polyimide, polyphenylene sulfide, and polyethylene terephthalate can be suitably used because they are excellent in abrasion resistance. Ultrahigh molecular weight polyethylene refers to polyethylene having a weight average molecular weight increased to 1,000,000 or more, and is commercially available, for example, under the trade name Dyneema (Organ DSM) or Spectra (US Honeywell). The dynamic friction coefficient of the resin tape measured by the method described in the following examples is preferably 0.8 or less, more preferably 0.6 or less, still more preferably 0.5 or less, 0 Most preferably, it is not more than .4.

The resin tape needs to be flexible enough to follow deformation during use during manufacture. Therefore, the thickness of the resin tape is preferably thin, preferably 500 μm or less, more preferably 300 μm or less, further preferably 100 μm or less, and most preferably 50 μm or less. The lower limit of the thickness of the resin tape is not particularly limited, but may be 3 μm or more from the viewpoint of handling at the time of production. Further, in order to prevent the resin tape from peeling off from the backup portion, the thickness of the resin tape with respect to the thickness of the backup portion is preferably 50% or less, more preferably 30% or less, and 10% It is more preferable that it is the following, and it is most preferable that it is 5% or less.
The length (width) of the short side of the resin tape is not particularly limited, but generally it is cheaper as the width is narrower, so it is preferable that the width is smaller than the width of the backup portion and 60% or less of the width of the backup portion Is preferable, 40% or less is more preferable, and 30% or less is more preferable. However, in terms of handleability at the time of production, the width of the resin tape is preferably 2 mm or more. The width of the resin tape may be the same as the width of the backup unit.

  The resin tape is preferably subjected to a surface treatment to improve the adhesion to the polyurethane constituting the backup portion. The method of surface treatment is not particularly limited, and flame treatment, corona treatment, plasma treatment, UV treatment, ozone treatment, chemical treatment, roughening treatment and the like can be mentioned.

"Backup section"
The backup unit 12 is made of polyurethane and has a flat surface 121. The backup portion presses the contact portion against the photosensitive drum with an appropriate pressure due to the elasticity of polyurethane. The thickness of the back-up portion may be in the range that can give the elastic body an appropriate stiffness, and is usually about 500 μm to 3 mm.

  The flat surface preferably has a flatness of 100 μm or less according to JIS B0621. Further, flame treatment, corona treatment, plasma treatment, UV treatment, ozone treatment, chemical treatment, roughening treatment and the like can be applied to the flat surface in order to improve the adhesion to the resin tape. Even if the flatness is greater than 100 μm, the effects of the present invention can be obtained as long as the contact portion uniformly contacts the photosensitive drum with an appropriate pressure.

The polyurethane is obtained by reacting a polyurethane composition containing a polyol and a polyisocyanate.
"Polyol"
Examples of 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, 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 And polyester type polyols obtained by the above method; polycaprolactone diol; polycarbonate diol and the like.
Among these, polyether-type polyols having less environmental dependence of viscoelasticity are preferable.

"Polyisocyanate"
As the polyisocyanate, metaxylene diisocyanate (XDI), tolylene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 1,4-cyclohexane diisocyanate, etc. It can be mentioned.

  In the production of the above polyurethane, the equivalent ratio of OH group / NCO group is preferably 0.80 or more and 1.10 or less, and more preferably 0.90 or more and 1.05 or less from the physical properties of the polyurethane to be produced.

  In the polyurethane composition, in addition to the above-mentioned polyol and polyisocyanate, addition of a crosslinking agent (chain extender), surfactant, flame retardant, coloring agent, filler, plasticizer, stabilizer, release agent, catalyst, etc. Agents can be formulated. Also, a conductive agent and an abrasive can be blended.

  Crosslinking agents (chain extenders) include low molecular weight diols such as ethylene glycol, 1,4-butanediol, diethylene glycol, 1,6-hexanediol, neopentyl glycol and the like and diamines such as ethylene diamine, hexamethylene diamine and isophorone diamine It can be mentioned. Preferably, low molecular weight diols are used. Furthermore, if necessary, trimethylolpropane, triols such as glycerin, triamines such as triethanolamine, and ethylene oxide and propylene oxide adducts of these can also be added as polyfunctional components.

Moreover, reaction accelerators, such as a general amine compound and an organic tin type-compound, can be used as needed. For example, the imidazole derivative etc. which are disclosed by patent 2942283, Paragraph 0022-0023 are mentioned. Specific examples thereof include 2-methylimidazole and 1,2-dimethylimidazole which are highly dependent on reaction temperature due to chemical structure.
The reaction accelerator is preferably used in a range of 0.001 parts by weight or more and 0.5 parts by weight or less, and 0.01 parts by weight or more and 0.3 parts by weight or less, based on 100 parts by weight in total of the polyol and the polyisocyanate. It is more preferable to use in the range of As the reaction accelerator, those having temperature sensitivity or delayed effect can prevent the urethane resin composition mixed with the reaction accelerator from curing before molding, and can prolong the pot life, and the demolding time Is preferable because it becomes short. Specifically, 1,8-diazabicyclo (5,4,0) undecen-7-organic acid salt which is referred to as a block amine, 1,5-diazabicyclo (4,3,0) nonene-5-organic acid salt Or a mixture of these.

"Adhesive layer"
The adhesive layer bonds the contact portion 11 and the flat surface 121 of the backup portion 12. The adhesive layer can be used without limitation as long as it can firmly bond the material of the resin tape constituting the contact portion and the polyurethane constituting the backup portion, for example, epoxy type, acrylic type, An adhesive of urethane type, silicon type or the like can be used.

  The elastic body of the present invention can be manufactured by a continuous forming method using a forming drum provided with a forming groove on the outer periphery, as described in detail below. In the continuous molding method, the time from when the polyurethane composition is cast in the molding groove of the molding drum to when taken out as a strip polyurethane is about 30 to 60 seconds when the molding drum rotates about half. The 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 peeled off from the forming drum in about 30 to 60 seconds.

"blade"
FIG. 2 shows one embodiment of the blade of the present invention.
The blade 3 according to one embodiment includes a contact portion 11 made of resin tape and a backup portion 12 having polyurethane and a flat surface 121, and an adhesive layer for bonding the contact portion 11 and the flat surface 121 of the backup portion 12 And a support member 2 joined to the elastic body 1.
The bonding method of the elastic body and the support member is not particularly limited as long as it can bond firmly, and an adhesive, double-sided tape, etc. can be used. Further, the shape of the support member and the bonding position of the elastic body to the support member are not particularly limited, and can be appropriately designed according to the space around the photosensitive member in which the blade is installed.

"Production method of elastic body"
The elastic body of the present invention can be produced by a continuous molding method.
The method for producing an elastic body of the present invention by a continuous molding method is
1. Supplying a polyurethane composition to the forming groove while rotating a forming drum having a forming groove on an outer periphery thereof;
2. An endless belt that rotates in synchronization with the rotation of the forming drum covers the forming groove, and the polyurethane composition is cured in a cavity formed by the forming groove and the endless belt to form a strip polyurethane having a flat surface Manufacturing process,
3. Bonding the flat surface of the strip polyurethane and the wide resin tape with an adhesive to produce a strip elastic body;
4. Cutting the elastic band;
Have at least

"Molding device"
One structural example of the molding apparatus used for the continuous molding method of an elastic body is shown in FIG. An example of the manufacturing method of the elastic body of this invention is demonstrated with the shaping | molding apparatus which is one structural example.
The molding device 4 which is one structural example has a molding drum 401, a discharge port 402 for supplying a polyurethane composition, an external heating device 403, an endless belt 404, a delivery device 410 for delivering a wide resin tape T, and the like.

The forming drum 401 has a forming groove (not shown) 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 is concave in cross section which is engraved at a predetermined depth corresponding to the thickness of the elastic body. The width of the forming groove may be equal to or greater than the width of the elastic body, but is preferably twice the width of the elastic body. If the width of the forming groove is twice the width of the elastic body, the elastic body can be efficiently manufactured by cutting the obtained belt-like elastic body B at a predetermined length and the center in the width direction. .
The internal heating device provides the heat that cures the polyurethane composition. The internal heating device is not particularly limited, such as an electric heater, heating oil, steam and the like. The heating temperature is determined by the polyurethane composition, the rotation speed, etc., and is set, for example, in the range of 110 ° C. or more and 150 ° C. or less.

  The discharge port 402 continuously supplies the polyurethane composition, in which the respective components are uniformly mixed, to the forming groove at a constant discharge rate. The molding groove is heated by the internal heating device, and the polyurethane composition supplied to the molding groove starts a thermosetting reaction immediately after the casting into the molding groove.

  The external heating device 403 is provided as needed. The external heating device 403 heats, from the surface side, the polyurethane composition cast from the discharge port 402 into the forming groove to promote the heat curing of the surface side. In the cast polyurethane composition, the thermosetting reaction proceeds by the internal heating device and the external heating device 403 to increase the viscosity, whereby the inflow to the contact point between the molding drum 401 and the endless belt 404 is suppressed. . In addition, since the flowability of the polyurethane composition can be rapidly reduced, it is possible to thicken the strip polyurethane UB to be produced and to increase the molding speed.

  As the external heating device 403, non-contact type far infrared rays, laser light, ultraviolet rays, induction heating and 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 strip polyurethane UB to be produced, the distance to the forming groove, and the like. Further, the installation position of the external heating device 403 can be adjusted according to the reactivity of the polyurethane composition between the discharge port 402 and the preheating roll 405 and the thickness of the strip polyurethane UB to be manufactured. In this configuration example, it is installed near the top of the forming drum 401.

The endless belt 404 covers about a half circumference of the forming drum 401 and cools the preheating roll 405 for preheating the endless belt 404, the guide roll 406 for adjusting the belt traveling, the tension roll 407 for applying tension, and the endless belt 404. It is wound around the cooling roll 408 and rotates in synchronization with the rotation of the forming drum 401.
The endless belt 404 covers the forming groove of the forming drum 401 to form a cavity filled with the polyurethane composition together with the forming groove. That is, the forming groove and the endless belt 404 have a function as a mold when the polyurethane composition is cured. The endless belt 404 is also heated by the preheating roll 405 to prevent the temperature of the polyurethane composition from decreasing upon contact with the endless belt 404. Then, the polyurethane composition is filled in the cavity formed by the molding groove and the endless belt 404, and is thermally cured in a state where the outer shape is adjusted, to form a strip polyurethane UB. Note that the section covering the forming groove by the endless belt 404 is not limited to about a half of the periphery of the forming drum 401, and if it is the section necessary to cure until the polyurethane composition can be peeled off the endless belt 404 Good.

  The cured strip polyurethane UB is peeled from the endless belt 404 and the forming groove. A cooling device 409 that cools by blowing cold air or the like from the outside of the endless belt 404 can be installed as needed immediately before peeling the strip polyurethane UB.

  The feeding device 410 feeds the wide resin tape T along the flow of the strip polyurethane UB. The wide resin tape T is wound in a roll, and an adhesive layer (not shown) is provided on one side of the wide resin tape T in advance. The fed wide resin tape T is adhered to the flat surface of the strip polyurethane UB via the adhesive layer by the pressure roller 411, and the strip elastic body B is manufactured. The feeding device 410 may be any device as long as it can rotatably hold the roll-shaped wide resin tape T, and can also be rotated in synchronization with the flow of the strip polyurethane UB. In addition, since the strip polyurethane UB manufactured by the continuous molding method is flat on both sides, the wide resin tape T can be bonded to any surface of the strip polyurethane UB.

The belt-like elastic body B is cut in the length direction to form a sheet-like elastic body S.
By cutting the sheet-like elastic body S at the center in the width direction (FIG. 4), the elastic body 1 according to one embodiment of the present invention can be manufactured (FIG. 1). The wide resin tape T is cut into the contact portion 11 made of the resin tape of the elastic body 1. And since the new corner which arose by cutting is sharp, it can be made to contact a photo conductor etc. as it is.
Subsequently, the obtained elastic body 1 and the support member 2 are joined to obtain a blade 3 which is an embodiment of the present invention (FIG. 2).

  The above manufacturing method is an example, and for example, the width of the formed groove is 3 times the width of the elastic body, two wide resin tapes are fed in parallel to the formed groove, and the obtained elastic band is divided into three in the width direction , Elastic body can also be manufactured. In addition, by cutting a band-shaped elastic body prepared using a wide resin tape having almost the same width as the molding groove width into a plurality of pieces with a predetermined width, the contact portion made of the resin tape is formed over the entire width direction of the elastic body. The elastic body provided can also be manufactured. Furthermore, the blade support in which two or more processing reference structures described in WO 2015/064184 and two or more attachment reference structures are formed, and the processing reference structure of the blade support Using a jig having a fitting structure in which the two blade supports can be placed so that the elastic body joint faces each other, and a blade receiving space is provided between the facing portions. Thus, after bonding the blade support to both sides of the sheet-like elastic body, it can be cut in the longitudinal direction. It can also have processes such as inspection, packing, shipping and the like. In addition, by providing a coating device for applying an adhesive to either or both of the wide resin tape and the strip polyurethane between the feeding device and the press roll, the wide resin tape not provided with the adhesive layer in advance is used. You can also

"Example 1"
The elastic body of the present invention was manufactured by the above-mentioned continuous molding method.
A tape made of ultrahigh molecular weight polyethylene (trade name: No. 440, width 5 mm, thickness 100 μm) made of ultra-high molecular weight polyethylene was used as the wide resin tape.
Poly (tetramethylene ether glycol) (manufactured by Hodogaya Chemical Industry Co., Ltd., trade name: PTG 2000 SN, number average molecular weight 2000) was dehydrated under reduced pressure at 110 ° C. for 2 hours. To 100 parts by weight of this polyol, 103 parts by weight of 4,4-diphenylmethane diisocyanate (MDI) (made by Tosoh Corporation, trade name: monomeric MDI) as polyisocyanate is added, and synthesis is performed at 100 ° C. for 3 hours under nitrogen atmosphere To obtain a prepolymer. The NCO% of this prepolymer is 14.7%.
The prepolymer (100 parts by weight) in the prepolymer tank of the casting machine, polytetramethylene ether glycol (PTG2000SN) (80 parts by weight) in the polyol tank, and 1,4-butanediol (9. 9 parts) in the crosslinker tank. 2 parts by weight), 1,1,1-trimethylolpropane (2.3 parts by weight), 1,8-diazabicyclo (5,4,0) -undecene-7 (0.2 parts by weight) (liquid temperature) 60 ° C), mixed and stirred.

The mixed and stirred composition was supplied from the casting machine to the forming groove. The amount supplied was such that the cavity consisting of the forming groove and the endless belt was just filled. The cavity cross-sectional dimension was 25 mm in width, 2 mm in depth, the mold temperature was 140 ° C., and the crosslinking time was 45 seconds.
A wide elastic tape was obtained by bonding a wide resin tape to the central portion in the width direction of the polyurethane strip peeled from the molding groove with an epoxy adhesive. The obtained elastic band is cut into 232 mm in the length direction, and then cut along with the wide resin tape at the center in the width direction, and an elastic body having a contact portion made of a resin tape having a width of 2.5 mm and a thickness of 100 μm. I got The width of the backup portion is 12.5 mm, the thickness is 2 mm, and the width of the resin tape is 2.5 mm. The elastic body and the support member were joined to produce a blade 1.

"Example 2"
A blade 2 was manufactured in the same manner as in Example 1 except that a tape (made by Asahi Glass Co., Ltd., trade name: Aflex, width 5 mm, thickness 100 μm) made of ETFE was used as a wide resin tape.
"Example 3"
A blade 3 is manufactured in the same manner as in Example 1 except that a tape made of PEEK (trade name: APTIV film 1000 series, width 5 mm, thickness 50 μm) made of PEEK is used as a wide resin tape. Manufactured.
"Example 4"
A blade 4 was manufactured in the same manner as Example 1 except that a tape made of PI (made by Toray DuPont Co., Ltd., trade name: Kapton 200 V, width 5 mm, thickness 50 μm) was used as a wide resin tape. .

"Example 5"
A blade 5 was manufactured in the same manner as in Example 1 except that a tape made of PPS (trade name: Tolerina, width 5 mm, thickness 50 μm) made of PPS was used as a wide resin tape.
"Example 6"
A blade 6 was manufactured in the same manner as in Example 1 except that a tape made of PET (manufactured by Toray Industries, Inc., trade name: Lumirror S10, width 5 mm, thickness 50 μm) was used as a wide resin tape.
"Example 7"
A blade 7 is prepared in the same manner as in Example 1 except that a tape made of ultrahigh molecular weight polyethylene (trade name: No. 440, width 5 mm, thickness 500 μm) made of ultrahigh molecular weight polyethylene is used as a wide resin tape. Manufactured.

"Comparative example 1"
A blade 8 was manufactured in the same manner as in Example 1 except that the wide resin tape was not used.

The obtained blade was evaluated based on the following criteria. The results are shown in Table 1.
<Evaluation>
Coefficient of friction FIG. 5 shows a schematic view of the coefficient of friction measurement test. Using a surface property measuring machine (manufactured by Shinto Scientific Co., Ltd., device name: TYPE 14), a PET film P installed on the flat plate is a contact portion made of resin tape of blades 1 to 7 or polyurethane of blade 8 The contact portion consisting of the above was abutted at an angle of 25 degrees, and the load W was set to 100 g / cm. Next, the resistance value F when moving the PET film in the direction of arrow A at a moving speed of 100 mm / sec is measured, and the dynamic coefficient of friction μ = F / W (no unit) at 23 ° C. It was measured. The measurement is performed three times for each blade, and the arithmetic mean value is shown.
(Test method and conditions)
Testing machine: Made by Shinto Kagaku Co., Ltd., Device name: TYPE 14
Test environment: 23 ° C
Counterpart material: PET film (untreated side)
Load: 100g
Contact angle: 25 ° (special jig)
Sliding direction: Trailing Sliding width: 20 mm
Sliding speed: 100 mm / sec
Calculation formula: μ = F / W

The printing traveling test (30000 sheets) was carried out using the blades 1 to 8 as cleaning blades of a commercially available digital color multifunction peripheral (MPC 2503, manufactured by Ricoh Co., Ltd.).
The abrasion of the contact portion after the test was visually confirmed and evaluated according to the following criteria. In addition, the printed matter after the test and the charging roller were visually checked for the occurrence of problems caused by the blade.
· Wear resistance (contact part)
:: No deformation was observed at the contact part.
Good: Wear and chipping of 0.01 mm or less at the contact portion are observed.
Δ: Wear and chipping of 0.03 mm or less at the contact portion are observed.
×: Wear and chipping greater than 0.05 mm are observed at the contact portion.

・ Toner slip through ○: No slip through ×: Slip through ・ External additive slip through ◎: No stain on the charging roller ○: Dirty evenly on the charge roller :: Dirty on the charge roller locally ×: Defective image due to dirt on the charge roller Occurrence: Toner filming ◎: no abnormal image due to filming ○: partial abnormal image due to filming is thin Δ: abnormal image due to filming is thin ×: abnormal image due to filming is clearly visible

The blade of the present invention manufactured in Examples 1 to 7 had a coefficient of dynamic friction of the contact portion at half or less and low friction as compared with the conventional blade made of polyurethane manufactured in Comparative Example 1. Further, in the blade of the present invention, since the backup portion is made of conventionally used polyurethane and is pressed against the photosensitive member by the elasticity of the polyurethane, it was possible to prevent the toner from slipping through.
The blade of the present invention manufactured in Examples 1 to 7 had low friction at the contact portion, and therefore no slippage of the external additive and toner filming were observed. That is, the blade of the present invention can prolong the life of the entire system including the photosensitive member in contact with the blade. In particular, in Examples 1, 3 and 4 in which ultra high molecular weight polyethylene, polyetheretherketone, and polyimide, which are materials having excellent abrasion resistance, are used for the contact portion, no deformation of the contact portion occurs even after printing 30,000 sheets. It can not be seen, and the life of the blade itself can be remarkably prolonged as compared with the conventional blade. In addition, since the blade of the present invention manufactured in Examples 1 to 7 can prevent toner filming, it is suitable for use in low melting point toners and fine toners in which toner filming tends to occur.
On the other hand, with the blade manufactured in Comparative Example 1, it was possible to confirm an abnormal image due to toner filming and contamination of the charging roller. This is because the coefficient of dynamic friction of the contact portion is large and heat is easily generated by frictional heat.

Claims (5)

An abutment made of resin tape,
A backup section made of polyurethane and having a flat surface,
An adhesive layer for bonding the contact portion and the flat surface of the backup portion;
An elastic body characterized by having:   The thickness of the said resin tape is 3 micrometers or more and 500 micrometers or less, The elastic body of Claim 1 characterized by the above-mentioned.   The elasticity according to claim 1 or 2, wherein the resin tape is made of any one of ultra high molecular weight polyethylene, fluorine resin, polyacetal, polyamide, polyimide, polyetheretherketone, polyphenylene sulfide, polyethylene terephthalate and polycarbonate. body. The elastic body according to any one of claims 1 to 3;
A support member joined to the elastic body,
A blade characterized by having. Supplying a polyurethane composition to the forming groove while rotating a forming drum having a forming groove on an outer periphery thereof;
An endless belt that rotates in synchronization with the rotation of the forming drum covers the forming groove, and the polyurethane composition is cured in a cavity formed by the forming groove and the endless belt to form a strip polyurethane having a flat surface Manufacturing process,
Bonding the flat surface of the strip polyurethane and the wide resin tape with an adhesive to produce a strip elastic body;
Cutting the elastic band;
An elastic body having a contact portion made of a resin tape, a backup portion made of polyurethane and having a flat surface, and an adhesive layer bonding the contact portion and the flat surface of the backup portion Manufacturing method.