JP5021920B2 - Fixing part cleaning sheet, fixing part cleaning material, and fixing part cleaning device - Google Patents

Description

  The present invention relates to a fixing unit cleaning sheet, a fixing unit cleaning material, and a fixing unit cleaning device.

  Conventionally, in an electrophotographic apparatus such as a copying machine, a laser beam printer, or a facsimile, a copy sheet (for example, paper, film, etc.) carrying an unfixed toner image is supplied between a fixing roll and a pressure roll, The toner image was fixed on the surface of the copy sheet by the action of heat and pressure. Therefore, the toner is transferred to the surface of the fixing roll and / or the pressure roll, and the transferred toner is transferred again to the rear end portion of the copy sheet or the next passing copy sheet, so that the copy sheet is soiled (so-called offset). There was a problem. For this reason, a cleaning sheet is generally used in which oil is applied to the surface of the fixing roll to improve the releasability of the toner and the toner can be wiped off.

  As such a cleaning sheet, a non-woven fabric in which a wholly aromatic polyamide fiber excellent in heat resistance is fixed by pressing with an unstretched polyester fiber is generally used. Further, since such a cleaning sheet is required to have excellent wiping properties, the applicant of the present application stated that “(a) the softening point is made of a resin exceeding 230 ° C., the fiber cross-sectional shape is non-circular, and the fiber diameter is A first ultrafine fiber having a diameter of 10 μm or less and (b) a second ultrafine fiber having a softening point in a range of 150 ° C. to 230 ° C. and having a fiber diameter of 10 μm or less. Deformed cleaning sheet ", more specifically," a fiber web made of a splittable fiber that can be divided into a first ultrafine fiber and a second ultrafine fiber by mechanical action, and a first ultrafine fiber and a second ultrafine fiber by water flow. A cleaning sheet in which only the generated second ultrafine fibers were crimped and deformed after being entangled and entangled was proposed (Patent Document 1).

JP 2002-23545 A (Claim 1, Example 1 etc.)

  However, in order to suppress or prevent the offset, the surface of the fixing roll is usually coated with a fluorine-based resin or the like, but since the friction resistance of this fluorine-based resin or the like is weak, the above-described cleaning sheet is used. The surface of the fixing roll is damaged by the initial or long-term cleaning, and this damage causes problems such as defective image missing of a copied image and long-term image reproduction stability. Such a problem is particularly a problem in the case of a color copy image.

  The present invention has been made to solve such a problem, and it is possible to fix the toner such as a fixing roll so that the toner can be fixed without impairing the image omission of the copied image or the long-term image reproduction stability. It is an object of the present invention to provide a cleaning sheet, a cleaning material, and a cleaning device that can wipe off toner without damaging the portion.

The invention according to claim 1 of the present invention is “a cleaning sheet for a fixing portion composed of a non-adhesive fiber and an adhesive fiber and made of a fiber-bonded non-woven fabric that has been heated and pressed over the entire surface. As non-adhesive fibers, polyphenylene sulfide non-adhesive flat fibers and / or polyethylene terephthalate non-adhesive flat fibers having a flatness ratio of 0.6 or less are bonded to polyphenylene sulfide non-adhesive non-flat fibers and / or polyethylene terephthalate non-adhesive non-flat fibers. A fiber web formed by opening a polyphenylene sulfide unstretched adhesive fiber and / or a polyethylene terephthalate unstretched adhesive fiber as the fiber is formed, and then heated and pressed entirely through a heat calender roll. , “Fixing part cleaning sheet”.

  The invention according to claim 2 of the present invention is “the cleaning sheet for fixing portion according to claim 1, wherein the fiber-bonded nonwoven fabric is produced by a dry method”.

The invention according to claim 3 of the present invention is the “cleaning sheet for fixing portion according to claim 1, wherein the apparent density is 0.2 to 0.6 g / cm ³ ”. is there.

The invention according to claim 4 of the present invention is as described in any one of claims 1 to 3 , wherein the surface of the non-adhesive fiber and / or the surface of the adhesive fiber is coated with a silicone-based resin. And “fixing part cleaning sheet”.

The invention according to claim 5 of the present invention is “the cleaning sheet for a fixing portion according to any one of claims 1 to 4 , wherein the cleaning sheet contains silicone oil”.

According to a sixth aspect of the present invention, the fixing portion cleaning sheet according to any one of the first to fifth aspects is wound around a winding shaft, and one end thereof is fixed to the winding shaft. It is a cleaning material for a fixing portion.

According to a seventh aspect of the present invention, there is provided "a fixing unit cleaning sheet unwinding unit, a fixing unit cleaning sheet winding unit, and a fixing unit cleaning sheet of the fixing unit cleaning material according to claim 6 ". And a pressing unit that can press the fixing unit against the fixing unit.

According to the first aspect of the present invention, since the non-adhesive flat fibers having a flatness ratio of 0.6 or less are included as non-adhesive fibers, the fixing portion cleaning sheet has high smoothness, such as a fixing roll. Since the friction with the fixing unit can be reduced, the toner can be wiped off without damaging the fixing unit. That is, it is possible to generate ultrafine fibers having a flatness ratio of 0.6 or less by dividing a conventional splittable fiber, but in order to split the splittable fiber, water flow or the like is applied to the fiber web. Even when splitting by applying an external force, the ultrafine fibers are likely to be unevenly distributed in a state close to the dispersed state of the splittable fibers before splitting, and the smoothness of the fixing unit cleaning sheet is relatively low. The fixing part cleaning sheet of the present invention was originally manufactured using a manufacturing raw material containing non-adhesive flat fibers having a flatness ratio of 0.6 or less, so that the non-adhesive flat fibers are the entire fixing part cleaning sheet. Are uniformly dispersed and have high smoothness.
Further, since the non-adhesive fiber has a Young's modulus lower than that of the conventional wholly aromatic polyamide fiber and is made of softer polyphenylene sulfide fiber or polyethylene terephthalate fiber, the fixing portion is hardly damaged.

  According to the invention of claim 2 of the present invention, since the fiber-bonded nonwoven fabric, that is, the fixing portion cleaning sheet is manufactured by a dry method, the fiber-bonded nonwoven fabric constituent fibers (particularly non-bonded flat fibers) are uniform. It can be a fixing portion cleaning sheet that is dispersed, uniform, and uniform in density.

According to the third aspect of the present invention, since the apparent density of the cleaning sheet for the fixing unit is 0.2 to 0.6 g / cm ³ , the fixing unit is not too hard and not too soft. In addition, it is excellent in toner wiping property, that is, cleaning property.

According to the invention of claim 4 of the present invention, the friction with the fixing portion such as a fixing roll can be further reduced by coating the surface of the non-adhesive fiber and / or the surface of the adhesive fiber with the silicone resin. Since it is possible, it is hard to damage a fixing part.

According to the invention of claim 5 of the present invention, since the silicone oil is included and the silicone oil can be applied to the fixing portion to improve the releasability of the toner, the toner wiping property (cleaning property) is improved. Are better.

According to the invention of claim 6 of the present invention, the fixing portion cleaning sheet is wound around the unwinding shaft, and one end of the cleaning sheet is fixed to the winding shaft. The cleaning sheet can be unwound and cleaned for a long period without damaging the fixing portion.

According to the seventh aspect of the present invention, the fixing unit cleaning sheet unwinding unit, the fixing unit cleaning sheet winding unit, and the fixing unit cleaning sheet are pressed against the fixing unit. The fixing unit cleaning sheet is unwound from the unwinding shaft and can be pressed against the fixing unit by the pressing unit, so that the fixing unit can be cleaned for a long time without being damaged.

  The fixing portion cleaning sheet of the present invention (hereinafter sometimes simply referred to as “cleaning sheet”) is composed of a fiber-bonded nonwoven fabric composed of non-adhesive fibers and adhesive fibers, and has a flatness of 0 as non-adhesive fibers. It is characterized in that it contains 6 or less non-adhesive flat fibers. By including such non-adhesive flat fibers, the smoothness of the cleaning sheet is higher than before and the friction with the fixing part such as a fixing roll can be reduced, so that the toner is not damaged. Can be wiped out. If the flatness ratio of the non-adhesive flat fibers exceeds 0.6, the smoothness of the cleaning sheet tends to be insufficient and the fixing portion tends to be damaged, and the preferable flatness ratio is 0.5 or less, and the more preferable flatness ratio is 0.4 or less, and a more preferable aspect ratio is 0.3 or less. The lower limit of the flattening ratio is not particularly limited, but if the flattening ratio is extremely low, it becomes difficult to deteriorate the production stability of the fiber web or make the apparent density of the cleaning sheet uniform. Because of the tendency, the flatness ratio is preferably 0.2 or more.

  The “flatness” in the present invention means a (minor axis / major axis) ratio in the fiber cross section, the major axis means the length of the longest part in the fiber cross section, and the minor axis is orthogonal to the major axis. And the length of the longest part. For example, when the fiber cross section of the non-adhesive flat fiber is elliptical, the flatness means a (short axis / long axis) ratio.

  The fiber cross-sectional shape of such non-adhesive flat fibers is preferably substantially oval or substantially rectangular so that the smoothness of the cleaning sheet can be improved. That is, if the fiber cross-sectional shape has an angular portion such as a substantially triangular shape or a substantially Y shape, the angular portion increases friction with the fixing portion, and the fixing portion is easily damaged. An oval shape or a substantially rectangular shape is preferable.

  The temperature of the general fixing unit (180 to 200 ° C.) is such that the non-adhesive flat fiber of the present invention does not melt or decompose even if it comes into contact with the fixing unit to significantly reduce the tensile strength of the cleaning sheet. A drawn fiber made of a resin having a higher melting point or decomposition point of 220 ° C. or higher is preferable. Examples of the resin having a melting point of 220 ° C. or higher include 66 nylon, polyesters such as polyethylene terephthalate and polybutylene terephthalate, or polyphenylene sulfide. Examples of the resin having a decomposition point of 220 ° C. or higher include: Examples thereof include meta-type or para-type aromatic polyamide, polyamideimide, polytetrafluoroethylene, aromatic polyetheramide, polybenzimidazole, and the like. Among these, non-adhesive flat fibers made of polyethylene terephthalate or polyphenylene sulfide that are softer and less likely to damage the fixing portion are preferable.

  “Stretched” means that the strength and thermal stability of the fiber is increased by a stretching process (for example, stretching by fluid stretching, neck stretching, etc.) different from the spinning process in order to enhance molecular orientation and crystallization. The state that raised the.

  The fineness of such non-adhesive flat fibers is 0.1 dtex to 7 dtex so that the cleaning sheet is not too hard and not too soft, does not damage the fixing part, and is excellent in cleaning properties. Preferably, it is 0.5 dtex to 4 dtex. Further, since the fiber bonded nonwoven fabric, which is a cleaning sheet as described later, is preferably manufactured by a dry method, the fiber length is 30 to 110 mm, which is suitable for manufacturing a fiber web by a dry method. Preferably, it is 35-70 mm.

  The cleaning sheet of the present invention contains non-adhesive flat fibers as described above, and the amount thereof preferably accounts for 10 mass% or more of the entire cleaning sheet so as to be excellent in the smoothness of the cleaning sheet, and is 15 mass% or more. More preferably, and more preferably 20% by mass or more. On the other hand, it is preferable to occupy 80 mass% or less of the entire cleaning sheet, because it is necessary to maintain the form of the cleaning sheet by adhering the adhesive fibers in addition to non-adhesive flat fibers, and 70 mass% or less. More preferably, it occupies 65 mass% or less.

  The cleaning sheet of the present invention includes the non-adhesive flat fibers as described above. The non-adhesive flat fibers other than the non-adhesive flat fibers (hereinafter referred to as “non-adhesive non-flat fibers”). In some cases). The general fiber cross section of such non-adhesive non-flat fibers is circular, and by including such non-adhesive non-flat fibers, it is not too hard and not too soft, and does not damage the fixing part. Moreover, it is easy to obtain a cleaning sheet with an apparent density that is excellent in cleaning properties.

  Thus, the non-adhesive fiber in the present invention is a concept including both “non-adhesive flat fiber” and “non-adhesive non-flat fiber”.

  The non-adhesive non-flat fibers of the present invention, like the non-adhesive flat fibers, are generally fixed so that they do not melt or decompose even when they come into contact with the fixing portion, and the tensile strength of the cleaning sheet is significantly reduced. It is preferably a stretched fiber made of a resin having a melting point or decomposition point of 220 ° C. or higher, which is higher than the temperature of the part. Examples of such a resin include resins similar to those that can form non-adhesive flat fibers, and are preferably made of polyethylene terephthalate or polyphenylene sulfide that is softer and less likely to damage the fixing portion.

  The fineness of such non-adhesive non-flat fibers is the same as that of non-adhesive flat fibers, so that the cleaning sheet is not too hard and not too soft, does not damage the fixing part, and is excellent in cleaning properties. It is preferably 0.1 to 7 dtex, more preferably 0.5 to 5 dtex. Further, the fiber length is preferably 30 to 110 mm, which is suitable for producing a fiber web by a dry method, since the fiber bonded nonwoven fabric as a cleaning sheet is preferably formed by a dry method as described later. More preferably, it is -70 mm.

  When the non-adhesive non-flat fiber as described above is included, if the amount is too large, the smoothness of the surface of the cleaning sheet tends to be impaired, or the apparent density of the cleaning sheet tends to be too low. Therefore, it is preferable to occupy 10% by mass or more of the cleaning sheet, more preferably 20% by mass or more, and more preferably 30% by mass or more. preferable. On the other hand, it is preferable to occupy 70% by mass or less of the entire cleaning sheet, more preferably 55% by mass or less, and 45% by mass or less so that the amount of non-adhesive flat fibers and adhesive fibers does not decrease too much. More preferably it occupies.

  The cleaning sheet of the present invention includes a non-adhesive flat fiber as described above, and optionally a non-adhesive non-flat fiber, which includes an adhesive fiber and a fiber-bonded nonwoven fabric to which the adhesive fiber is bonded. The form of the cleaning sheet can be maintained by the adhesive fixing of the adhesive fibers. Since the cleaning sheet has an effect of wiping away the toner by contacting with the fixing unit having a temperature of about 180 to 200 ° C., the melting point of 220 ° C. or more is maintained so that the form of the cleaning sheet can be maintained even when contacting the fixing unit. In particular, an unstretched fiber is particularly preferable because the fiber constituent resin is rearranged and crystallized by pressurization in addition to heating, and heat resistance is improved.

  As a resin preferable for constituting such an adhesive fiber, a resin similar to a resin having a melting point of 220 ° C. or higher that can constitute a non-adhesive flat fiber can be exemplified, which is softer and less likely to damage the fixing portion. It is preferably made of polyethylene terephthalate or polyphenylene sulfide. In the present invention, “unstretched” means that a stretching step different from the spinning step (for example, stretching by fluid stretching, neck stretching, etc.) is not performed, or even if it is performed, the stretching ratio is as high as that of the stretched fiber. The state which is not extended | stretched and the molecular orientation and crystallization degree are low.

  The fiber cross section in the adhesive fiber cleaning sheet is random because it is bonded, and is preferably deformed by pressure and in a non-circular state. By deforming in this way, the smoothness of the cleaning sheet can be improved. In addition, since the fiber cross section of the adhesion fiber before adhesion | attachment deform | transforms by adhesion | attachment, it does not specifically limit.

  The fineness of the adhesive fiber before bonding is preferably 1 dtex to 7 dtex, and more preferably 2 dtex to 5 dtex so that the adhesive strength with the non-adhesive fiber is high. Moreover, since the fiber length of the bonded fiber before bonding is preferably manufactured by a dry method as described later, the fiber bonded nonwoven fabric that is a cleaning sheet is suitable for manufacturing a fiber web by a dry method, 30 to 110 mm is preferable, and 35 to 70 mm is more preferable.

  The amount of such adhesive fibers preferably occupies 20 mass% or more of the entire cleaning sheet, more preferably occupies 30 mass% or more, and 35 mass% or more so that the cleaning sheet shape maintenance is excellent. More preferably it occupies. On the other hand, it is preferable to occupy 90 mass% or less of the entire cleaning sheet, more preferably 85 mass% or less, and 80 mass% or less so that the amount of non-adhesive flat fibers is not too small. Is more preferable.

  The fiber-bonded non-woven fabric which is the cleaning sheet of the present invention contains the non-adhesive flat fiber, the adhesive fiber, and optionally the non-adhesive non-flat fiber as described above. As a preferred combination, (1) polyphenylene sulfide non-adhesive flat fiber And / or a combination of polyethylene terephthalate non-adhesive flat fibers and polyphenylene sulfide unstretched adhesive fibers and / or polyethylene terephthalate unstretched adhesive fibers, (2) polyphenylene sulfide non-adhesive flat fibers and / or polyethylene terephthalate non-adhesive flat fibers Polyphenylene sulfide non-adhesive non-flat fibers and / or polyethylene terephthalate non-adhesive non-flat fibers, and polyphenylene sulfide unstretched adhesive fibers and / or polyethylene terephthalate unstretched adhesive fibers Seen together, it can be mentioned.

  The cleaning sheet of the present invention contains non-adhesive flat fibers, adhesive fibers, and in some cases non-adhesive non-flat fibers as described above. The non-adhesive flat fibers are uniformly dispersed and are excellent in surface smoothness. It is manufactured based on the manufacturing raw material containing a non-adhesive flat fiber so that it may be possible. In other words, when non-adhesive flat fibers are generated by dividing the fiber after forming the fiber web, the non-adhesive flat fibers are unevenly distributed, the surface is not smooth, and the fixing portion is easily damaged. As in the present invention, the cleaning sheet manufactured based on the raw material originally containing flat non-adhesive flat fibers has non-adhesive flat fibers uniformly dispersed, the surface is smooth, and the fixing portion is not easily damaged. It is.

  Note that the entire fiber-bonded nonwoven fabric is heated and pressurized so that the cleaning sheet can maintain its shape even when it comes into contact with the fixing unit, and the entire bonded fiber is deformed and the bonded fiber is bonded in a smoothed state. preferable. This is because the fixing portion is less likely to be scratched.

  The fiber-bonded nonwoven fabric that is a cleaning sheet is preferably a dry-type nonwoven fabric manufactured by bonding adhesive fibers that constitute a fiber web manufactured by a dry method. This is because the fibers constituting the fiber-bonded non-woven fabric are uniformly dispersed, and there is no unevenness, and the cleaning sheet can have a uniform density. This “dry method” is a method in which fibers are dispersed without using a liquid as a fiber dispersion medium to form a fiber web, and specific examples include a card method and an air lay method.

Furthermore, the cleaning sheet of the present invention preferably has an apparent density of 0.2 to 0.6 g / cm ³ . If the apparent density is within this range, it is neither too hard nor too soft, so that the fixing portion is not damaged, and the toner wiping property, that is, the cleaning property is excellent. More preferably, the apparent density is 0.3 g / cm ³ or more, still more preferably 0.4 g / cm ³ or more, and more preferably, the apparent density is 0.55 g / cm ³ or less, More preferably, it is 0.5 g / cm ³ or less. The “apparent density (D)” in the present invention means a quotient obtained by dividing the basis weight (M, unit: g / cm ² ) by the thickness (T, unit: cm), that is, a value obtained from the following formula. . “Weight weight” refers to the mass per 1 cm ² measured by the method specified in JIS L 1096, and “Thickness” is the measured value by the method specified in JIS B 7502, that is, the outer micrometer at 5 N load. The measured value by.
D = M / T

The basis weight of the cleaning sheet of the present invention is preferably 5 × 10 ⁻⁴ g / cm ² or more and 70 × 10 ⁻⁴ g / cm ² or less, and 15 × 10 ⁻⁴ g / cm ² or more, 30 ×. More preferably, it is 10 ⁻⁴ g / cm ² or less. Moreover, it is preferable that thickness is 10 * 10 < ^-4 > cm or more and 350 * 10 < ^-4 > cm or less.

  Further, the cleaning sheet of the present invention does not need to have a single layer structure, and may have a laminated structure of two or more layers having different fiber blends. For example, by providing a layer with a large amount of non-adhesive flat fibers as a surface layer, the smoothness of the cleaning sheet is improved, the friction with the fixing part is further reduced, and the strength is given by another layer, so that The form stability in can be improved.

  As described above, the cleaning sheet of the present invention contains non-adhesive flat fibers, has a small friction with the fixing part, and is difficult to damage the fixing part. (Adhesive flat fibers, non-adhesive non-flat fibers) and / or the surface of the adhesive fibers are preferably coated with a silicone resin. Since the coating with the silicone resin is effective even a little, the coating amount is not particularly limited, but is preferably 0.5 to 5 mass% with respect to the fiber mass. Examples of the silicone resin include a modified silicone resin modified with a pure silicone resin, an alkyd resin, an epoxy resin, a phenol resin, an acrylic resin, and / or a melamine resin. The entire fiber surface does not need to be coated with a silicone resin. Non-adhesive fibers and / or adhesive fibers coated with a silicone resin and non-adhesive fibers and / or adhesive fibers not coated with a silicone resin. May be mixed.

The cleaning sheet of the present invention preferably contains silicone oil so as to enhance the releasability of the toner and to be excellent in the wiping property (cleaning property) of the toner. The silicone oil content varies depending on the thickness of the cleaning sheet and is not particularly limited, but is preferably 10 to 40 g / m ² . Further, the kinematic viscosity of the oil is not particularly limited, and oil having a viscosity of 10 to 100,000 mm ² / s <25 ° C.> can be used. Furthermore, the type of silicone oil is not particularly limited, and for example, straight silicone oil (dimethyl silicone oil, methylphenyl silicone oil, etc.), modified silicone oil (alkyl modified silicone oil, polyether modified silicone oil, amino modified silicone oil, epoxy) Silicone oil such as modified silicone oil) can be used alone or in combination.

  The fiber-bonded nonwoven fabric that is the cleaning sheet of the present invention can be produced, for example, as follows.

  First, fibers constituting the fiber bonded nonwoven fabric, that is, non-bonded flat fibers, bonded fibers, and if necessary, non-bonded non-flat fibers are prepared. Since these fibers are conventionally known fibers, they can be easily obtained.

  Next, using these fibers, they are mixed and opened according to the content ratio in the fiber-bonded nonwoven fabric to form a fiber web. As described above, the fiber web is preferably produced by a dry method. A laminated fiber web in which crossed fiber webs are laminated by a cross layer or the like so as to intersect the orientation direction of the unidirectional fiber web on the unidirectional fiber web by the card method is excellent in strength in all directions. At the same time, when the cross fiber web surface of the laminated fiber web is brought into contact with the fixing portion, the toner can be wiped linearly, so that the cleaning property is excellent. Moreover, the cleaning sheet which has a laminated structure can be manufactured by laminating | stacking two or more fiber webs from which fiber mixing differs.

  And the adhesive fiber which comprises a fiber web can be adhere | attached, and a fiber bonding nonwoven fabric, ie, a cleaning sheet, can be manufactured. As described above, the adhesive fiber is preferably deformed and bonded in a smooth state to contribute to the action of not damaging the fixing portion. Therefore, it is preferable to heat and press the entire fiber web. This heating and pressing condition can be found experimentally. For example, in the case where the adhesive fiber is made of suitable unstretched polyethylene terephthalate fiber, the temperature is preferably 170 to 250 ° C. and the linear pressure is 98 to 980 N / cm. Such heating and pressurization can be performed, for example, by passing between thermal calender rolls.

The apparent density of the cleaning sheet is preferably 0.2 to 0.6 g / cm ³ , but such apparent density includes the fineness of the non-adhesive flat fibers and the appropriate amount of non-adhesive non-flat fibers. And / or the adhesion condition (particularly, heating and pressing condition) of the adhesive fiber can be adjusted as appropriate.

  The non-adhesive fibers (non-adhesive flat fibers, non-adhesive non-flat fibers) and / or adhesive fiber surfaces constituting the cleaning sheet of the present invention are preferably coated with a silicone resin as described above. A cleaning sheet can be produced by coating the surface of non-adhesive fibers and / or adhesive fibers with a silicone resin, and then producing a cleaning sheet by the same method as described above, and forming a fiber-bonded nonwoven fabric by the same method as described above. Later, the surface of the non-adhesive fiber and / or the surface of the adhesive fiber can be coated with a silicone resin. The latter method is preferable because it can be produced by a simple process without impairing the adhesive property of the adhesive fiber. In order to coat the non-adhesive fiber surface and / or the adhesive fiber surface with a silicone resin, for example, the silicone resin is subjected to dip nip impregnation, emulsion impregnation, spray coating, coating, etc., and then thermosetting or ultraviolet curing. For example, a silicone resin may be coated and fixed.

  As described above, since the cleaning sheet of the present invention preferably contains silicone oil, it is preferable that the cleaning sheet is impregnated, coated, or sprayed with silicone oil.

  The fixing member cleaning material of the present invention (hereinafter sometimes referred to as “cleaning material”) has the cleaning sheet as described above wound around a winding shaft, and one end thereof is fixed to the winding shaft. Therefore, the cleaning sheet can be unwound from the unwinding shaft, and cleaning can be performed for a long time without damaging the fixing portion.

  The cleaning sheet can be fixed to the winding shaft by, for example, (1) fixing with a double-sided tape, (2) fixing with an adhesive resin such as hot melt resin, and (3) when the shaft is made of a thermoplastic resin. Is fixed by thermal bonding with the cleaning sheet, (4) fixing by inserting a cleaning sheet into the shaft and inserting the cleaning sheet, (5) fixing by inserting a cleaning sheet into the groove formed in the shaft, and so on. In addition, when fixing by the method of said (1)-(3), you may fix to the whole surface of a shaft, and may fix it partially. On the unwinding shaft side, the cleaning sheet may be fixed in the same manner as the winding shaft, or it may be simply wound around the unwinding shaft.

  The fixing unit cleaning device of the present invention (hereinafter sometimes referred to as “cleaning device”) includes a cleaning sheet unwinding unit, a cleaning sheet unwinding unit, and a cleaning sheet that press the cleaning sheet against the fixing unit. Pressing means that can be used. Therefore, since the cleaning sheet can be unwound from the unwinding shaft and pressed against the fixing unit by the pressing means, cleaning can be performed without damaging the fixing unit for a long period of time.

  Examples of the winding means constituting the cleaning device of the present invention include a drive motor connected to the winding shaft. Further, as the unwinding means, for example, a drive motor connected to the unwinding shaft can be exemplified, and in some cases, the cleaning sheet can be unwound by the action of the winding means, so it is particularly necessary to provide it. Absent.

  Further, as a pressing means for the fixing portion of the cleaning sheet, for example, a rod-like body having a circular or polygonal cross section (for example, quadrangle, hexagonal, etc.) or a plate-like body having an R surface is applied to the fixing portion by a spring or the like. The method of pressurizing can be mentioned. In particular, it is preferable that the cleaning sheet is a rod-like body having a circular cross section that can uniformly press the cleaning sheet to the fixing portion. Since this rod-like body or plate-like body is preferably excellent in elasticity and heat resistance, it is preferably made of, for example, foamed or non-foamed silicone rubber. The pressing force by the rod-like body or plate-like body is such that the working width (nip width) between the rod-like body or plate-like body and the fixing portion is 3 mm or less so that the toner wiping property is excellent. Is preferred.

  Examples of the present invention will be described below, but the present invention is not limited to the following examples.

Example 1
Non-adhesive flat drawn fiber made of polyethylene terephthalate (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 260 ° C.) 20 mass%, non-made of polyphenylene sulfide Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 285 ° C.) 35 mass%, and adhesive unstretched fiber consisting of polyethylene terephthalate (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 260 ° C.) was opened by a card machine to obtain a unidirectional fiber web.

Next, the fiber web was pressed and pressed over the entire surface between a steel roll and a cotton roll at a temperature of 200 ° C. (linear pressure: 392 N / cm), and the basis weight was 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 2)
A fiber-bonded nonwoven fabric (cleaning sheet) produced in the same manner as in Example 1 was impregnated with an amino-modified silicone resin emulsion, and then thermally cured at a temperature of 130 ° C., and the fiber surface was covered and fixed with the amino-modified silicone resin (fiber-bonded nonwoven fabric). The mass per unit area of 20 × 10 ⁻⁴ g / cm ^{2 was 1} mass%) to obtain a silicone resin-coated cleaning sheet.

Next, dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) was coated on this silicone resin-coated cleaning sheet (amount: 10 × 10 ⁻⁴ g / cm ² ), and a silicone oil-containing silicone system was obtained. A resin-coated cleaning sheet was obtained.

(Example 3)
Non-adhesive flat drawn fiber made of polyethylene terephthalate (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 260 ° C.) 20 mass%, non-made of polyethylene terephthalate Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 260 ° C.) 35 mass%, and adhesive unstretched fiber (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 260 ° C.) was opened by a card machine to obtain a unidirectional fiber web.

Next, this fiber web is pressed and pressed over the entire surface between a steel roll and a cotton roll at a temperature of 190 ° C. (linear pressure: 363 N / cm), and the basis weight is 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

Example 4
Non-adhesive flat drawn fiber made of polyethylene terephthalate (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 260 ° C.) 20 mass%, non-made of polyethylene terephthalate Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 260 ° C.) 35 mass%, and adhesive unstretched fiber made of polyphenylene sulfide (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 285 ° C.) was opened using a card machine to obtain a unidirectional fiber web.

Next, this fiber web was pressed between the steel roll and cotton roll at a temperature of 210 ° C. (linear pressure: 421 N / cm) by heating and pressing the entire surface, and the basis weight was 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 5)
Non-adhesive flat drawn fiber made of polyethylene terephthalate (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 260 ° C.) 20 mass%, non-made of polyphenylene sulfide Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 285 ° C.) 35 mass%, and adhesive unstretched fiber composed of polyphenylene sulfide (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 285 ° C.) was opened using a card machine to obtain a unidirectional fiber web.

Next, this fiber web was pressed and heated over the entire surface between a steel roll and a cotton roll at a temperature of 210 ° C. (linear pressure: 461 N / cm), and the basis weight was 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

Example 6
Non-adhesive flat drawn fiber made of polyphenylene sulfide (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 285 ° C.) 20 mass%, non-made of polyethylene terephthalate Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 260 ° C.) 35 mass%, and adhesive unstretched fiber (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 38 mm, melting point: 260 ° C.) The mass per unit area is 20 × 10 ⁻⁴ g / cm ^{2 in the same} manner as in Example 1 except that a unidirectional fiber web opened by 45% by card is used. And a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ^3. Manufactured. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 7)
Non-adhesive flat drawn fiber made of polyphenylene sulfide (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 285 ° C.) 20 mass%, non-made of polyethylene terephthalate Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 260 ° C.) 35 mass%, and adhesive unstretched fiber made of polyphenylene sulfide (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 285 ° C.) was opened using a card machine to obtain a unidirectional fiber web.

Next, this fiber web is pressed and pressed over the entire surface between a steel roll and a cotton roll at a temperature of 210 ° C. (linear pressure: 441 N / cm), and the basis weight is 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 8)
Non-adhesive flat drawn fiber made of polyphenylene sulfide (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 285 ° C.) 20 mass%, non-made of polyphenylene sulfide Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 285 ° C.) 35 mass%, and adhesive unstretched fiber consisting of polyethylene terephthalate (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 260 ° C.) was opened by a card machine to obtain a unidirectional fiber web.

Next, this fiber web is pressed and pressed over the entire surface between a steel roll and a cotton roll at a temperature of 200 ° C. (linear pressure: 421 N / cm), and the basis weight is 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

Example 9
Non-adhesive flat drawn fiber made of polyphenylene sulfide (flatness: 0.27, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, melting point: 285 ° C.) 20 mass%, non-made of polyphenylene sulfide Adhesive unflattened fiber (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 285 ° C.) 35 mass%, and adhesive unstretched fiber composed of polyphenylene sulfide (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 45 mass% (38 mm, melting point: 285 ° C.) was opened using a card machine to obtain a unidirectional fiber web.

Next, this fiber web was pressed and pressed over the entire surface through a steel roll and a cotton roll (linear pressure: 490 N / cm) at a temperature of 215 ° C., and the basis weight was 20 × 10 ⁻⁴ g / cm ^2. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced. The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 10)
Instead of 20 mass% of non-adhesive flat fibers of Example 1, non-adhesive flat stretched fibers made of polyethylene terephthalate (flatness: 0.55, cross-sectional shape: substantially oval, fineness: 2.8 dtex, fiber length: 51 mm, Except for using 20 mass% (melting point: 260 ° C.), the mass density was 20 × 10 ⁻⁴ g / cm ² , the thickness was 40 × 10 ⁻⁴ cm, and the apparent density was the same as in Example 1. Produced a fiber-bonded nonwoven fabric (cleaning sheet) of 0.5 g / cm ³ . The unbonded unstretched fiber in this fiber-bonded nonwoven fabric deforms and fills the gap between the non-bonded flat-stretched fiber and the non-bonded unflattened-stretched fiber, contributing to the smoothing of the fiber-bonded nonwoven fabric surface.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Example 11)
Except that the fiber-bonded nonwoven fabric was manufactured so that the basis weight was 15 × 10 ⁻⁴ g / cm ² , the thickness was 80 × 10 ⁻⁴ cm, and the apparent density was 0.19 g / cm ^3. In the same manner as in No. 1, a silicone oil-containing cleaning sheet was obtained.

(Example 12)
Except that the fiber-bonded non-woven fabric was manufactured to have a basis weight of 25 × 10 ⁻⁴ g / cm ² , a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.63 g / cm ^3. In the same manner as in No. 1, a silicone oil-containing cleaning sheet was obtained.

(Comparative Example 1)
Meta-type aromatic polyamide non-adhesive non-flat fibers (cross-sectional shape: circular, fineness: 1.7 dtex, fiber length: 38 mm) and 55 mass%, adhesive unstretched fibers made of polyethylene terephthalate (cross-sectional shape: circular, fineness: 4 dtex) , Fiber length: 38 mm, melting point: 260 ° C.) is mixed with 45 mass% of the fiber web between a steel roll and a cotton roll at a temperature of 220 ° C. (linear pressure: 470 N / cm), and is heated and pressed over the entire surface for pressure bonding. Thus, a fiber-bonded nonwoven fabric (cleaning sheet) having a basis weight of 20 × 10 ⁻⁴ g / cm ² , a thickness of 40 × 10 ⁻⁴ cm and an apparent density of 0.5 g / cm ³ was produced.

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Comparative Example 2)
Instead of 20 mass% of the non-adhesive flat drawn fiber of Example 1, a non-adhesive flat drawn fiber made of polyethylene terephthalate having a flatness ratio of 0.7 (cross-sectional shape: substantially oval, fineness: 2.2 dtex, fiber length: 51 mm) , Melting point: 260 ° C.) Except that 20 mass% was used, the mass density was 20 × 10 ⁻⁴ g / cm ² , the thickness was 40 × 10 ⁻⁴ cm, and the apparent density was the same as in Example 1. Produced a fiber-bonded nonwoven fabric (cleaning sheet) of 0.5 g / cm ³ .

Thereafter, this fiber-bonded nonwoven fabric was coated with dimethylpolysiloxane (viscosity: 10,000,000 mm ² / s <25 ° C.>) (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. .

(Comparative Example 3)
Divided fibers composed of polyethylene terephthalate component (melting point 260 ° C.) and 6 nylon components (melting point 215 ° C.) and having an orange cross-sectional shape (fineness: 2.2 dtex, fiber length: 51 mm, fineness comprising divided polyethylene terephthalate) Is 0.1 dtex, the flatness is 0.4, the cross-sectional shape is eight wedge-shaped ultrafine fibers, and the fineness of 6 nylon is 0.1 dtex, the flatness is 0.4, and the cross-sectional shape is wedge-shaped 8 masses of non-adhesive non-flat drawn fibers made of polyphenylene sulfide (cross-sectional shape: circular, fineness: 1 dtex, fiber length: 51 mm, melting point: 285 ° C.), 35 mass%, and polyethylene terephthalate. Bonded unstretched fiber (cross-sectional shape: circular, fineness: 4 dtex, fiber length: 38 mm, melting point: 260 ° C.) 4 The mass%, to form a unidirectional fiber web A by spreading the carding machine.

Next, the unidirectional fiber web B manufactured in the same manner as the unidirectional fiber web A and having the same fiber composition is placed on the unidirectional fiber web A by a cross layer. Laminate so as to cross the direction, and laminate fiber web (the weight of the unidirectional fiber web A is 20 × 10 ⁻⁴ g / cm ² , and the weight of the intersected fiber web is 20 × 10 ⁻⁴ g / cm ² ). Formed.

Next, a water flow at a pressure of 10 MPa is ejected from a nozzle plate in which nozzles having a diameter of 0.13 mm are arranged in four rows at a pitch of 0.6 mm on the fiber web side where the laminated fiber webs intersect to divide the splittable fiber. And an entangled fiber web having a basis weight of 40 × 10 ⁻⁴ g / cm ² was produced.

Further, this entangled fiber web was heated and pressed over the entire surface between a steel roll and a cotton roll at a temperature of 200 ° C. (linear pressure: 392 N / cm), and the basis weight was 40 × 10 ⁻⁴ g / in cm ^2, a thickness of at 40 × ¹⁰ -4 cm, apparent density to produce a 0.5 g / cm ³ of fiber bonding nonwoven (the cleaning sheet).

Thereafter, dimethylpolysiloxane (kinematic viscosity: 10,000 mm ² / s <25 ° C.>) is coated on this fiber-bonded nonwoven fabric (amount: 10 × 10 ⁻⁴ g / cm ² ) to obtain a silicone oil-containing cleaning sheet. It was.

<Evaluation of wear condition of fixing roll>
A copying machine equipped with a heat roller type fixing device is prepared, and the silicone oil-containing cleaning sheets of the examples and comparative examples are formed on the fixing roll (surface temperature: 190 ° C.) of the copying machine in a circular shape made of foamed silicone rubber. Were pressed (nip width: 2 mm, pressing force 0.4 N / cm) and brought into contact with the fixing roller.

  Next, a program mode is set in which the image fixing rate per A4 size paper is 90% at a speed of 20 sheets per minute for A4 size paper, and the unwinding speed of the cleaning sheet is 0.004 m / min. 50,000 sheets were continuously fed. At this time, the surface abrasion state of the fixing roll was observed with a microscope every 10 thousand sheets when the number of sheets passed was 0 to 10,000, and every 10,000 sheets when the number of sheets passed was 1 to 50,000. The results are shown in Table 1.

＜残留トナーの払拭性評価＞
前述の（定着ロールの磨耗状態評価）方法にて、通紙枚数０．１万枚時の定着ロールの摩耗状態評価を行う前に、ベタ白モードでの複写を３枚行い、３枚目の通紙画像上におけるオフセットトナーの定着状態を目で観察した。この結果は表２に示す通りであった。

<Evaluation of wipeability of residual toner>
Before evaluating the wear state of the fixing roll when the number of sheets to be passed is 10,000 by the above-described method (evaluation of wear state of the fixing roll), three copies are made in the solid white mode, and the third sheet The fixing state of the offset toner on the paper passing image was visually observed. The results are shown in Table 2.

表１及び表２から、本発明のクリーニングシートは払拭性に優れているばかりでなく、定着ロールを傷つけにくいものであったため、複写画像の画像抜け不具合や長期的な画像再現安定性を損ねにくいものであることがわかった。

From Tables 1 and 2, the cleaning sheet of the present invention is not only excellent in wiping property but also difficult to damage the fixing roll. It turned out to be a thing.

Claims (7)

A fixing sheet cleaning sheet composed of a non-adhesive fiber and a non-adhesive fiber and made of a fiber-bonded non-woven fabric that has been heated and pressed over the entire surface. Polyphenylene sulfide non-adhesive flat fibers and / or polyethylene terephthalate non-adhesive flat fibers and polyphenylene sulfide non-adhesive non-flat fibers and / or polyethylene terephthalate non-adhesive non-flat fibers as adhesive fibers. A fixing part cleaning sheet, wherein a fiber web is formed by opening unstretched polyethylene terephthalate adhesive fibers , and then heated and pressed entirely through a heat calender roll . The fixing sheet cleaning sheet according to claim 1, wherein the fiber-bonded nonwoven fabric is manufactured by a dry method. The fixing sheet cleaning sheet according to claim 1, wherein the apparent density is 0.2 to 0.6 g / cm ³ . The fixing sheet cleaning sheet according to claim 1, wherein the non-adhesive fiber surface and / or the adhesive fiber surface is coated with a silicone-based resin. The fixing sheet cleaning sheet according to claim 1, further comprising silicone oil. 6. A fixing member cleaning material, wherein the fixing portion cleaning sheet according to claim 1 is wound around a winding shaft, and one end thereof is fixed to the winding shaft. . 7. A fixing unit cleaning sheet unwinding unit of the fixing unit cleaning material according to claim 6, a fixing unit cleaning sheet winding unit, and a pressing unit capable of pressing the fixing unit cleaning sheet to the fixing unit. A fixing unit cleaning device.