JP3112862U - Toner seal material - Google Patents

Abstract

In a photographic image forming process such as a laser beam printer and a facsimile, or in various work devices, close contact with the peripheral surface of a photosensitive drum, a developing roller, etc. simultaneously achieves prevention of toner leakage and scraping of residual toner. A toner seal material is provided.
A felt material in which a card wrap mainly composed of a heat-resistant organic fiber having an acute angle formed in a fiber cross section is integrated by needle punching, and an adhesive layer for fixing the felt material in a predetermined position. Prepare.
[Selection] Figure 6

Description

  The present invention mainly prevents the leakage of toner and scrapes off residual toner by closely contacting the peripheral surface of a photosensitive drum or developing roller in a photographic image forming process such as an electronic copying machine, a laser beam printer, and a facsimile. The present invention relates to a toner sealant that is achieved at the same time.

  The electrophotographic image forming process such as an electrophotographic copying machine or a laser beam printer is currently integrated with a photosensitive drum, a developing roller, and other base materials as shown in Japanese Patent Laid-Open No. 2001-290405, and is made detachable as a cartridge. A method of performing maintenance by the user himself is common. In this process cartridge, waste toner generated by the cleaning mechanism is discharged into a cleaning container and discarded at the same time when the cartridge is replaced. This cleaning mechanism scrapes the residual toner from the surface of the photosensitive drum after the primary transfer, and attaches a sealing material to both ends of the cleaning blade and the opening of the cleaning container so as to face the photosensitive drum, so that the residual toner is placed on both sides of the container. Prevent leakage from.

  In the electrophotographic image forming process, the periphery of the photosensitive drum and the developing roller is higher than normal temperature and may temporarily reach around 100 ° C. For this reason, it is common to use felt of PTFE (polytetrafluoroethylene) fiber having excellent slidability and heat resistance as a sealing material in the vicinity of the photosensitive drum and the developing roller, and the normal PTFE fiber is a matrix. Brown with emulsion spinning with material and heat treatment. In addition, since these sealing materials are required to maintain smooth rotation of the operating members and have high closeness, usually two layers of a felt material that comes into contact with the photosensitive drum and a urethane foam layer that imparts elasticity. It has a structure.

As known examples of sealing materials for preventing toner leakage, there are JP-A-61-129664, JP-A-4-134374, and registered utility model No. 2537613. PTFE fiber felt includes needle punch felt, flocked sheet or There is a smoothing felt. If this PTFE fiber is a normal felt, it needs to be made quite thick in order to exhibit high sealing performance even if a thick urethane foam layer is provided. It has also been proposed to apply a sealing material made of a dense pile-like woven fabric as disclosed in JP-A-11-61101 and JP-A-2003-220247.
JP 2001-290405 A JP 61-129664 A JP-A-4-134374 Registered Utility Model No. 2537613 JP-A-11-61101 Japanese Patent Laid-Open No. 2003-223447

  With regard to the sealing material used in the electrophotographic image forming process, in recent years, the toner fine particles have been further refined to 10 μm or less and the appearance of polymerized toner particles, etc. It is difficult to sufficiently exhibit the leakage prevention and toner scraping property. The felt of PTFE fiber is very expensive, and there is a certain limit to reducing its basic usage, and even if a urethane foam layer is installed on the back side, it is extremely difficult to maintain the original physical properties of PTFE fiber. It cannot be thinned. On the other hand, ordinary natural or synthetic fibers do not have the same physical properties as PTFE fibers in terms of slidability. If special fibers such as polyetheretherketone fibers are used, they become the same as PTFE fibers. This is not a cost advantage, although it is possible.

  On the other hand, the pile-like fabric sealing material has a long moquette pile length of 3 to 4 mm, so it has cushioning properties compared to PTFE fiber felt even without urethane foam or wool felt attached to the back side. And high sealing performance. This type of sealing material also solves the problem that it is difficult to prevent hair loss of PTFE fiber felt by weaving pile yarn into two layers of warp and weft yarns to prevent hair loss.

  On the other hand, this pile fabric sealing material requires two ground warps and two wefts to be fed into the loom at the same time in order to combine two layers of warp and weft. Instead, it becomes a custom-made machine and is very expensive. In addition, the amount of yarn used doubles and the manufacturing cost increases. Even if a back coating layer is provided to prevent hair loss and the pile yarn weight is fully packed with full gauge, voids are likely to remain at the base of the pile yarn after raising, and some of the toner particles leak from this pile base. I can't avoid doing it. In addition, it is almost impossible to achieve the scraping of the remaining toner at the same time as preventing the leakage of the toner.

  The present invention has been proposed in order to improve the above-mentioned problems relating to the toner sealing material mainly used in the electrophotographic image forming process. As a felt material, a heat-resistant organic fiber having an acute angle formed on a fiber cross section is used. It is an object of the present invention to provide a toner seal material that exhibits low friction and exhibits excellent toner leakage prevention performance. Another object of the present invention is to provide a toner seal material that can effectively scrape off toner remaining on the peripheral surface of a working member such as a photosensitive drum by forming an acute angle in the fiber cross section.

  The toner seal material according to the present invention is in close contact with the surface of an operation member such as a photosensitive drum or a developing roller, and prevents toner and oil from leaking to the outside. The toner seal material of the present invention includes a felt material in which a card wrap mainly composed of a heat-resistant organic fiber having an acute angle formed in a fiber cross section is integrated by needle punching, and for fixing the felt material in a predetermined position. An adhesive layer.

  A toner seal material according to the present invention includes a felt material in which a card wrap mainly composed of a heat-resistant organic fiber having an acute angle formed in a fiber cross section is integrated by needle punching, and is attached to a back surface of the felt material by a predetermined method. You may provide the cushion layer which provides elasticity, and the adhesive layer for fixing a felt material and a cushion layer to a predetermined position.

  In the toner seal material of the present invention, it is preferable that the felt material is composed of heat-resistant organic fibers manufactured by a film splitting method or a splitting method and having an acute angle formed in the fiber cross section. Particularly preferred is a polytetrafluoroethylene fiber having a rectangular fiber cross section produced by a fiber method. It is also possible to apply a fluororesin process to the surface of the felt material by spraying, coating or dipping.

  The present invention will be described with reference to the drawings. A felt material 1 (FIG. 1) used for a toner seal material 10 illustrated in FIG. 6 is formed from a heat-resistant organic fiber 2 manufactured by a film splitting method or a splitting method. After forming and integrating the lap with a needle punch, it is set to a predetermined thickness and density by heat treatment. In this integration, high-pressure water jet treatment may be performed after needle punching, or resin processing may be performed with a fluorine-based resin such as FEP resin (tetrafluoroethylene-hexafluoropropylene copolymer resin). This resin processing is, for example, surface spraying, coating, or impregnation treatment. If desired, as shown in FIG. 2, a heat-resistant organic fiber base fabric 4 can be interposed between the two equal card wraps 3, 3 or below the single card wrap.

  The organic fiber 2 constituting the felt material 1 may be PTFE fiber in terms of high slidability as long as it is heat resistant to the extent that it can be used around the photosensitive drum and the developing roller that temporarily reaches around 100 ° C. Particularly preferred. When the toner sealant is used in a high-temperature environment that reaches 180 to 230 ° C., the heat-resistant organic fiber 2 is made of PTFE fiber or other fluorine-based fiber, polyimide fiber and / or produced by a film splitting method. Aramid fiber is desirable. These fibers can be used by blending heat-resistant organic fibers produced by a splitting method or other inorganic or organic fibers to the extent that their physical properties are not impaired. The felt material 1 composed of these fibers has good thermal stability and cleaning properties.

  In the film splitting method, the thin film 5 (FIG. 3) is produced by a melt film formation method or the like, and then microslit, and in some cases, the organic fiber 2 having a rectangular cross section is obtained by further stretching and heat treatment. . In the case of PTFE, a paste obtained by adding a petroleum-based auxiliary agent to resin fine particles is formed into a raw tape shape by extrusion, and then the thin film 5 is split by a micro slitter, and then stretched and heat-treated. Thus, the cross section of the obtained PTFE fiber is rectangular. The organic fiber 2 produced by this manufacturing method is in the form of an ultrafine tape in which the fineness of a single yarn is usually 1 dtex or more and an acute angle is formed in the fiber cross section. The PTFE fiber by this manufacturing method is white with respect to the brown fiber by an emulsion spinning method.

  On the other hand, the fiber produced by the splitting method is a multicomponent composite fiber 6 (FIGS. 4 and 5) composed of at least two or more incompatible fiber-forming resins before splitting. The splittable composite fiber 6 is joined to a predetermined structure by a guide device or a flow path in the spinneret, and is discharged and solidified from the spinning hole and wound up. For example, one thermoplastic resin 7 is made of polyester. The other thermoplastic resin 8 is a two-component hollow or radial fiber whose nylon is nylon. The thermoplastic resins 7 and 8 become heat-resistant split fibers in which polyester fibers and nylon fibers are mixed after splitting.

  Examples of the splittable composite fiber 6 include polyester / nylon fiber, polyester / polypropylene fiber, polyester / polyethylene / polypropylene fiber, and polyester / nylon / polypropylene fiber as combinations with the thermoplastic resins 7 and 8, other than this combination Also, an appropriate combination can be adopted. For example, a suitable composite fiber 6 is a polyester / nylon fiber.

  The composite fiber 6 is divided by a mechanical action such as a needle punch, a heating action, or a chemical treatment with a solvent. As a result, the composite fiber 6 is split along the predetermined vertical streaks to be 8, 16, 24, etc., and the fineness per split is 0.1 to 0.5 dtex. Is preferable. The fibers after the division need only have an acute angle formed in the fiber cross section, and may be a fan-like fiber cross section as shown in FIG. 4 or a substantially triangular fiber cross section as shown in FIG.

  The felt material 1 composed of split fibers has good cleaning properties as well as those manufactured by the film splitting method, and further improves the dimensional stability of the felt material by interposing the base fabric 4 (FIG. 2). It is also possible. In the photographic image forming process, the toner seal material 10 reduces the frictional resistance of the contact surface with an operating member such as a photosensitive drum and a developing roller, and prevents toner and oil from leaking to the outside in close contact with the contact surface. When the lower surface of the felt material 1 is smoothed by additional heat press treatment, the fibers of the felt material 1 can be reliably fixed by the intervention of an adhesive (not shown) for attaching the cushion layer 12.

  As shown in FIG. 6, the toner seal material 10 usually has a cushion layer 12 attached to the felt material 1 with a desired adhesive. The cushion layer 12 is made of polyurethane foam, wool felt, needle felt or the like, and preferably has a thickness of 1.0 to 3.0 mm. If the adhesive is a heat-sealing sheet, the fibers of the felt material 1 can be fixed by the sheet, and the hair loss of the fibers can be further reduced. The heat-sealing sheet is a nonwoven fabric or resin sheet of a single or copolymer polymer such as polyamide or polypropylene, and preferably has a melting point of about 80 to 170 ° C. On the other hand, a double-sided pressure-sensitive adhesive tape may be used as the adhesive, and the double-sided pressure-sensitive adhesive tape can prevent the fiber from being removed by pressure bonding when the felt material 1 is thin.

  If desired, a pressure-sensitive or heat-sensitive adhesive layer such as a double-sided pressure-sensitive adhesive tape 14 may be further provided on the lower surface of the cushion layer 12. This adhesive layer makes it possible to attach the toner seal material 10 to an appropriate part of an electrophotographic image forming process or a work machine having a rotating roller and a reciprocating member.

  The toner seal material according to the present invention is made of a felt material composed of heat-resistant organic fibers formed on an acute-angle fiber cross section. When installed in a photographic image forming process such as an electronic copying machine or a laser printer, ordinary PTFE fibers alone In addition to having the slidability similar to that of felt, the sealing property is high, and the leakage of toner can be effectively prevented at a predetermined portion of the electrophotographic image forming process. The toner seal material of the present invention has a sharp cross section of the organic fiber constituting the felt material. In addition, it exhibits good toner scraping properties, that is, cleaning properties.

  The toner seal material of the present invention is far more advantageous in physical properties than the normal felt material made of PTFE fiber or meta-aramid fiber even though the unit price is almost the same. The toner seal material of the present invention is more flexible with improved heat shrinkability compared to that of aramid fiber alone, and the contact with the roller and the like is not deteriorated due to heat shrink. This improves the dimensional stability of the product and enables longer-term use. The toner seal material of the present invention has a low friction when a felt material is composed of PTFE fibers produced by a film splitting method, and is also excellent in thermal stability, oil retention, supply and cleaning properties.

  The felt material of the present invention is more flexible with improved heat shrinkability compared to the felt made of aramid fiber alone, and the contact with the roller or the like is not deteriorated due to heat shrinkage. Dimensional stability is improved and it can be used for a longer period. The felt material of the present invention can effectively reduce the cost while maintaining desired physical properties, and can flexibly cope with the selling price of an electronic copying machine or a laser beam printer which is a built-in main body.

Next, although this invention is demonstrated based on an Example, this invention is not limited to an Example. In order to manufacture the felt material 1 shown in FIG. 1, a 100% PTFE fiber web having an average fineness of 1.7 decitex and having a rectangular fiber cross section manufactured by a film splitting method is manufactured. This web is laminated to form a card wrap having a basis weight of 400 g / m ² , and the entire wrap is needle punched. After the needle punch, the felt material 1 having a thickness of 1.0 mm is obtained by pressing at about 250 ° C. for 3 minutes.

  As shown in FIG. 6, a cushion layer 12 made of polyurethane foam having a thickness of 2.2 mm is laminated on the felt material 1 through a polyamide-based heat-fusible nonwoven fabric (not shown), and the whole is heated. Paste through a pair. A double-sided pressure-sensitive adhesive tape 14 is further adhered to the lower surface of the cushion layer 12 to obtain the toner seal material 10.

  The toner seal material 10 is cut into a planar shape as illustrated in FIG. 7 and is used as an individual seal material 10a, 10a and 10b, 10b (FIG. 8). Adhere to the part. In FIG. 8, the cartridge 16 includes a frame 24 having a photosensitive drum 21, a charging roller 22 and a cleaning mechanism 23, and a developing mechanism 26 having a developing roller 25, and the developing mechanism can be rotated with respect to the frame 24. Attach as shown. When the cartridge 16 is detachably stored in the printer main body, an exposure mechanism for irradiating a laser beam 27 to form an electrostatic latent image on the drum surface is disposed above the cartridge. Is contacted by a transfer roller 28 for primary transfer of the developed toner image. The transfer paper 30 passes between the photosensitive drum 21 and the transfer roller 28, and a fixing device (not shown) is disposed in front of the arrow that is the feeding direction of the transfer paper.

  The photosensitive drum 21 is provided with a photosensitive layer such as OPC on the outer peripheral surface of the aluminum cylinder body. In this printer, the photosensitive drum 21 is rotated at a predetermined peripheral speed in the direction of the arrow, and the drum comes into contact with the charging roller 22 for uniformly charging the drum surface in accordance with the rotation, and then the laser beam 27 is sequentially applied. The exposure mechanism by irradiation, the developing roller 25 and the transfer roller 28 are contacted. As shown in FIG. 8, developing roller seals 10b and 10b are attached to both ends of the developing roller 25 to prevent the toner 31 from leaking out.

  The photosensitive drum 21 is adjacent to a cleaning mechanism 23 that removes residual toner after transfer after temporarily transferring the toner image formed on the drum surface to the transfer paper 30 by the developing roller 25 of the developing mechanism. The photosensitive drum 21 is opposed to the opening 34 of the cleaning container 32 in the cleaning mechanism 23, and a cleaning blade 36 made of urethane rubber or the like is installed at the edge of the opening so that the edge of the blade is moved to the photosensitive drum 21. After the primary transfer, the remaining toner is scraped off from the surface of the photosensitive drum and sent into the cleaning container 32.

  In the cleaning mechanism 23, sealing materials 10 a and 10 a are attached to both ends of the cleaning blade 36 in accordance with the shape of the cleaning blade 36, and the felt material also contacts both ends of the surface of the photosensitive drum 21. These sealing materials may be attached along the edge of the container opening 34. The cleaning mechanism 23 removes the toner remaining on the drum surface and accumulates it in the internal cleaning container 32. The sealing materials 10a and 10a prevent the collected residual toner from leaking out from both sides of the container opening 34. The cleaning mechanism 23 has an excellent toner removal capability due to the presence of the sealing materials 10 a and 10 a, and can be applied to the process cartridge 16.

  Each of the sealing materials 10a, 10a and 10b, 10b has a felt material 1 having a thickness of 1.0 mm, and the lower side double-sided adhesive tape 14 provides a predetermined portion, that is, an opening of the developing roller 25, the cleaning blade 36, and the cleaning container 32. 34 is attached to both ends of the cover 34 to prevent the toner from leaking outside. In the developing mechanism 26, since the sealing materials 10b and 10b function as a distance maintaining material, the minute distance between the developing roller 25 and the photosensitive drum 21 is always maintained constant, and a good image can be stably output. In the cleaning mechanism 23, the cleaning blade 36 and the container opening 34 can be lightly adhered to the drum surface due to the presence of the cushion layer 12 of the sealing materials 10a and 10a at both ends.

  The toner sealing material 10 has sufficient slidability and toner leakage prevention property in each of the sealing materials 10a, 10a and 10b, 10b. Therefore, the toner sealant 10 is widely applicable to the process cartridge 16 because it has an excellent ability to prevent toner leakage and toner removal and has high durability, and hardly damages the photosensitive drum 21 and the developing roller 25.

Comparative Example 1
Using a PTFE fiber having a fineness of 3.3 dtex, which is a circular fiber cross section obtained by the emulsion spinning method, 100% of the fiber is uniformly mixed to produce a web. This card wrap is processed in the same manner as in Example 1 to obtain a felt material having a thickness of 1.0 mm and a basis weight of 650 g / m ² . A cushion layer is laminated on the felt material in the same manner as in Example 1, and a double-sided pressure-sensitive adhesive tape is further adhered to produce a toner seal material.

  The toner seal material is appropriately cut and attached to the process cartridge 16 as individual seal materials as in the first embodiment. These sealing materials cause toner leakage from a part of the cartridge 16 even if the sliding property is relatively good.

Comparative Example 2
70% by weight of PTFE fiber with a fineness of 3.3 dtex, which is a circular fiber cross section obtained by the emulsion spinning method, and 30% by weight of meta-aramid fiber with a fineness of 2.2 dtex are uniformly mixed, and the resulting web is appropriately laminated. To form a card wrap. This card wrap is processed in the same manner as in Example 1 to obtain a felt material having a thickness of 1.0 mm and a basis weight of 370 g / m ² . A cushion layer is laminated on this felt material in the same manner as in Example 1, and a double-sided adhesive tape is further adhered to produce the felt material.

  The felt material is appropriately cut and applied to the process cartridge 10 as a sealing material as in the first embodiment. This felt material is liable to cause toner leakage from a part of the cartridge 10 even if the slidability is good.

  The same treatment as in Example 1 except that 70% by weight of PTFE fiber having a fineness of 3.3 dtex manufactured by the film splitting method as in Example 1 and 30% by weight of meta-aramid fiber having a fineness of 14.4 dtex were mixed. Thus, a felt material 1 having a thickness of 1.0 mm is obtained. A cushion layer 12 is laminated on the felt material 1 in the same manner as in Example 1, and a double-sided pressure-sensitive adhesive tape 14 is further adhered to produce the toner seal material 10.

  This toner seal material is appropriately cut and then applied to a toner cartridge 38 for a monochrome copying machine as shown in FIG. In the cartridge 38, arc-shaped cutout portions 40 are formed on both lower side walls thereof, and the developing roller 42 is rotatably installed in the cutout portion, and the toner 44 is stored in the cartridge. Both end portions of the developing roller 42 are extended to the notch portions 40 on both side walls, and are attached to the notch portion 40 via the seal material 46 so as to be rotatable. Above the toner supply port, a charging blade 48 is held while being pressed against the surface of the developing roller 42.

  The developing roller 42 is, for example, an aluminum cylinder, rotates with a thin layer of toner attached to the surface thereof, and is disposed to face the photosensitive drum 50 of the copying machine main body. When the photosensitive drum 50 rotates in the direction of the arrow and the developing roller 42 rotates in the counterclockwise direction, the toner adheres to the surface of the developing roller 42 according to the strength of the electric field formed by the charge of the latent image on the drum surface. And is developed by being attached to the charged portion of the drum surface.

  This toner seal material has a slightly lower slidability than that of the first embodiment as an individual seal material 46, but is at a sufficiently usable level, and the toner leakage prevention property is further improved. Therefore, the toner seal material can effectively prevent the toner 44 attached to the developing roller 42 in the cartridge 38 from leaking to the outside of the side wall.

In order to produce the felt material 1 shown in FIG. 1, the FEP film 5 (FIG. 3) having a thickness of 12.5 μm produced by the melt film formation method is split with a micro slitter and further stretched, whereby the fiber cross section is reduced. A rectangular FEP fiber having a fineness of 20 dtex is obtained. A card wrap having a basis weight of 400 g / m ² is formed from 100% of this fiber, and the entire wrap is needle punched. After the needle punch, the felt material 1 having a thickness of 1.0 mm is obtained by pressing at about 230 ° C. for 3 minutes. To this felt material, a cushion layer 12 is laminated in the same manner as in Example 1, and a double-sided pressure-sensitive adhesive tape 14 is further adhered to manufacture the toner seal material 10.

  When this toner sealant is applied to the process cartridge 16 in the same manner as in the first embodiment, the toner leakage prevention and toner removal capabilities are excellent, the durability is high, and the photosensitive drum 21 and the developing roller 25 are hardly damaged. This toner sealing material has excellent toner scraping properties, and can be widely applied to the process cartridge 16 and the toner cartridge 38 as in the first embodiment.

When a composite fiber made of polyester / nylon fiber is used and the composite fiber is divided by a needle punch. As a result, the composite fiber is divided into eight fibers along a predetermined longitudinal line, and the fineness per one fiber after division is 0.3 dtex. The split fiber has an acute angle in its fiber cross section. A card wrap having a basis weight of 300 g / m ² is formed from the split fibers, and the entire wrap is needle punched. A felt material 1 having a thickness of 1.0 mm is obtained by pressing after the needle punch. A cushion layer 12 is laminated on the felt material 1 in the same manner as in Example 1, and a double-sided pressure-sensitive adhesive tape 14 is further adhered to manufacture the toner seal material 10.

  When this toner sealant is applied to the process cartridge 16 in the same manner as in the first embodiment, the heat resistance and slidability are slightly low, but the toner leakage prevention and toner removal capabilities are excellent, and the photosensitive drum 21 and the developing roller 25 are damaged. There are few things. This toner sealing material has excellent toner scraping properties, and can be applied to the process cartridge 16 and the toner cartridge 38 as in the first embodiment.

It is a schematic sectional drawing which illustrates the felt material used by this invention. It is a schematic sectional drawing which shows another example of a felt material. It is a fragmentary perspective view which expands and shows an example of the thin film which can be split with a micro slitter. It is an expanded end view which shows the example of the hollow composite fiber which can be divided | segmented. It is an enlarged end view which shows the example of the radial composite fiber which can be divided | segmented. It is a schematic sectional drawing which shows an example of the toner seal material which concerns on this invention. (1) is a side view of the process cartridge shown with the developing mechanism and the photosensitive drum removed, and (2) is a side view of the photosensitive drum installed in the cartridge. It is a schematic sectional drawing which shows the use condition of the process cartridge of FIG. FIG. 3 is a schematic cross-sectional view showing an example in which a toner seal material is installed in a toner cartridge for a monochrome copying machine. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Felt material 2 Heat resistant organic fiber 5 Thin film 6 Composite fiber 10 Toner seal material 12 Cushion layer 16 Process cartridge

Claims (5)

  A toner sealant that prevents toner and oil from leaking to the outside in close contact with the surface of a working member such as a photosensitive drum or a developing roller, mainly composed of heat-resistant organic fibers with sharp angles formed in the fiber cross section. A toner seal material comprising a felt material in which a card wrap is integrated by needle punching and an adhesive layer for fixing the felt material in a predetermined position.   A toner sealant that prevents toner and oil from leaking to the outside in close contact with the surface of a working member such as a photosensitive drum or a developing roller, mainly composed of heat-resistant organic fibers with sharp angles formed in the fiber cross section. A felt material in which the card wrap is integrated by needle punching, a cushion layer that is attached to the back surface of the felt material to give a predetermined elasticity, and an adhesive layer for fixing the felt material and the cushion layer in a predetermined position. Toner sealing material comprising.   The toner seal material according to claim 1 or 2, wherein the felt material is made of a heat-resistant organic fiber manufactured by a film splitting method or a splitting method and having an acute angle formed in a fiber cross section.   The toner seal material according to claim 3, wherein the felt material is a polytetrafluoroethylene fiber having a rectangular fiber cross section produced by a film splitting method.   The toner sealing material according to claim 1 or 2, wherein the surface of the felt material is subjected to fluororesin processing by spraying, coating or dipping.

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