JP2002169392A - Seamless belt base material for image forming device, and fixing belt and photoreceptor belt using the base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seamless belt base material that is thin, has characteristics suitable for use as a fixing belt and photoreceptor belt of an image forming device, is easy to produce in large quantities, and is of low cost. SOLUTION: The base material is for the belt which is used in the image forming device. The base material is formed from an extremely thin tube obtained by squeezing a metallic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seamless belt base material used for an image forming apparatus such as a copying machine, a facsimile, a printer, etc.
It relates to a photoreceptor belt.

[0002]

2. Description of the Related Art In an image forming apparatus such as a copying machine, a facsimile or a printer, a photosensitive drum (latent image carrier) is used.
An image on the surface to form an electrostatic latent image, a toner is attached to the electrostatic latent image to form a visible toner image, and the toner image is transferred onto an object to be transferred. Each unit for separating an object to be transferred and heating an unfixed toner to heat and fix a toner image is incorporated.

FIG. 1A schematically shows an image forming apparatus, in which 100 is a photosensitive drum, 101 is a charging roll in contact with the surface thereof, 102 is a developing roll, 103 is a toner conveying roll, and 104 is a transfer roller. Reference numeral 105 denotes a cleaning roll, reference numeral 106 denotes a fixing belt, reference numeral 107 denotes a rubber roller, and reference numeral 108 denotes a heater built in the fixing belt 106. FIG. 1B shows another type, and FIG. 1C shows another type, and the same parts as those in FIG. 1B and 1C, the photosensitive drum has an endless belt shape.

As the photosensitive drum and photosensitive belt of the image forming apparatus described above, those made of resin have been used. However, they have low mechanical strength and poor durability, and have a large elongation. There is a problem that the stability of the compound is poor.
Further, as the fixing belt, there is a fixing tube in which a polyimide tube is coated with a fluorine resin having good releasability, but the heat conductivity is low, the mechanical strength is low, and the charge amount of the belt is low due to the insulating material. There are inconveniences such as ascent and the like.
Japanese Patent Application Laid-Open Publication No. 9-1997 proposes a fixing belt substrate formed of metal foil.

[0005] This prior art discloses a belt substrate manufactured by an electroforming method in which a mother roll is used as one electrode in a Ni salt solution and the other electrode is immersed in the Ni salt solution and energized.

[0006]

However, the prior art electroforming method has a problem in that the productivity is low and the cost is high, and that the waste liquid must be treated, thereby increasing the burden on the environment. As another method, there is a method in which the metal foil is rounded and the both ends are joined.However, since the joining portion tends to be convex, the printing state is distorted, the accuracy is deteriorated, and the durability of the joining portion is also deteriorated. There was a problem that it was easy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a thin belt which is suitable for use as a fixing belt or a photosensitive belt of an image forming apparatus. It is an object of the present invention to provide a low-cost seamless belt base material having characteristics and easy to mass-produce. Another object of the present invention is to provide an inexpensive fixing belt having excellent mechanical strength, thermal conductivity and durability. Another object of the present invention is to provide an inexpensive photoreceptor belt having good durability and shape stability.

[0008]

In order to achieve the above object, the present invention relates to a base material for a belt used in an image forming apparatus, the base material being an ultra-thin drawing obtained by drawing and squeezing a metal material. The basic feature is that it consists of an ironing tube. Further, the present invention provides the above-described ultra-thin drawn ironing tube, wherein L / R ≧ 4 and R / t ≧ in relation to a diameter R (mm), an axial length L (mm), and a thickness t (mm).
500.

[0009] Further, the present invention provides an ultra-thin drawn ironing tube in which a deep drawing product is deeply drawn, and an annealing process is interposed between the deep drawn product, and the first and the second are drawn using a floating die. It is characterized by being made by a secondary ironing process.

[0010] The present invention is also characterized in that the ultra-thin drawn ironing tube is a fixing belt covered with a release layer. Further, the present invention is characterized in that it is a photoreceptor belt in which a photoreceptor layer is provided on an extremely thin drawn ironing tube.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 2 (a) to 2 (c) show a seamless belt base material according to the present invention, which is made up of an ultra-thin drawn ironing tube 2 made by drawing and ironing a metal material. FIGS. 3A and 3B show a fixing belt or a photoreceptor belt using the seamless belt substrate according to the present invention, and reference numeral 1 denotes a fixing belt or a photoreceptor belt. Reference numeral 3 denotes a release layer coated on the outer surface of the ultrathin drawn and ironed tube 2, and reference numeral 3 'denotes a photosensitive layer when applied to a photosensitive belt.

The metal material forming the seamless belt substrate is selected from materials having good thermal conductivity, mechanical strength, durability and the like, and is most preferably an aluminum-based metal (aluminum and its alloys). , Nickel and iron are also suitable. Stainless steel, copper-based metal, and the like can also be applied in some cases.

The ultra-thin drawn ironing tube 2 has a relationship of L / R ≧ 4 and R / t ≧ 500 in relation to the diameter R (mm), the axial length L (mm), and the thickness t (mm). It is preferred that there be. The reason for this is that if the ratio is outside the range of L / R ≧ 4, the device becomes large and the size of the device is increased. The lower limit is not particularly limited, but the L / R is about 20 in terms of manufacturing technology, and most preferably, L / R / R is 6-10. Also, R / t ≧
If the ratio is outside the range of 500, the followability is insufficient due to a decrease in elasticity. For example, when applied to a fixing belt, it is difficult to fix a clear image or the size of the device is increased. Although the upper limit is not limited, it is usually set to R / t = 2000 or less. The thickness t is preferably from 20 to 80 μm. The reason is that when t is 20 μm or less, the mechanical strength is insufficient, and
If the thickness is 0 μm or more, the followability of the belt is insufficient, and an increase in the pressing force is required and the size of the device is increased.

As a specific specification, the thickness t is 20 to 8
0 μm, diameter 20-80 mm, length 300-400
mm, and the surface roughness is preferably 5 μm or less.

The release layer 3 is used to enhance the releasability of the toner. A layer selected from silicone rubber, fluorosilicone rubber, fluororubber, silicone resin, fluororesin, and the like, usually has a thickness of 1 to 500 μm. Coated. The release layer 3 may be squeezed and not directly on the surface of the ironing tube 2 but an intermediate layer made of a heat-resistant elastomer layer or the like may be interposed.

The photoreceptor layer 3 'may be of a single-layer type containing a charge-generating substance and a charge-transporting substance, or of a function-separated type in which a charge-generating layer and a charge-transporting layer are laminated. With respect to the function-separated type photoreceptor, as the charge generating material used in the charge generating layer, any of known charge generating materials can be used, and phthalocyanine, azo dye, quinacridone,
Polycyclic quinone, pyrylium salt, thiapyrylium salt, indigo, thioindigo, anthantrone, pyranthrone,
Examples include various organic pigments such as cyanine, dyes, and the like. Among them, metals such as metal-free phthalocyanines, copper indium chloride, gallium chloride, tin, oxytitanium, zinc, and vanadium, or oxides and chlorides of these phthalocyanines are preferable.

As the binder for the charge generation layer, resins such as polyacetal such as polyvinyl butyral, polyvinyl acetate, and phenoxy resin can be used. The thickness of the charge generation layer is usually 0.1 μm to 1 μm,
Preferably, it is 0.15 μm to 0.6 μm. The content of the charge generating substance used here is in the range of 20 to 300 parts by weight, preferably 50 to 200 parts by weight, based on 100 parts by weight of the binder resin.

As the charge transporting material in the charge transporting layer, various low molecular compounds such as pyrazoline derivatives, oxazole derivatives, hydrazone derivatives, stilbene derivatives, and arylamines can be used. A binder resin is blended with these charge transport materials. Preferred binder resins include, for example, polymethyl methacrylate, polystyrene, vinyl polymers such as polyvinyl chloride, and copolymers thereof, polycarbonate, polyester, polysulfone, polyether, polyketone, phenoxy, epoxy, silicone resin, and the like. These partially crosslinked cured products are also used.

Further, the charge transport layer may contain various additives such as an antioxidant and a sensitizer. The thickness of the charge transport layer is preferably 10 to 40 μm, and more preferably 10 to 30 μm.

A well-known barrier layer can be provided between the drawing and ironing tube 2 and the photoreceptor layer. As the barrier layer, for example, organic layers such as polyvinyl alcohol, casein, polyvinylpyrrolidone, polyacrylic acid, celluloses, gelatin, starch, polyurethane, polyimide, and polyamide are used, and if necessary, inorganic layers such as titanium oxide and aluminum oxide are used. Particles may be added.

The seamless belt substrate according to the present invention is characterized in that it comprises an ultra-thin drawn and ironed tube 2. The reason for adopting this and the manufacturing process will be described. Conventionally, metal tubes for belts used in image forming apparatuses have been manufactured by electroforming, but the manufacturing cost is extremely high, and to reduce this manufacturing cost, a plastic working method with high production efficiency is preferable. Therefore, the present invention is to manufacture by a drawing and ironing method.

However, although the drawing and ironing method (DI method) is known per se, usually, a metal material such as an aluminum disk is deep drawn and processed into a cup-shaped container, which is set in a DI press. Then, an ironing rate (about 66%) was obtained by redrawing and ironing with a plurality of ironing dies.

By applying this method, L / R ≧ 4 and R / t
Assuming that the specifications within the range of ≧ 500, for example, a seamless belt base material having a thickness of 50 μm, a diameter of φ60 mm and a height of 320 mm are processed under the same ironing rate applying conditions as usual, the cutout at both ends in the longitudinal direction is considered Then, the blank as a material becomes large, for example, about φ186 mm. For this reason, the diameter (usually φ6
Since it is difficult to obtain a cup-shaped container of about 6 mm in a single deep drawing process, before performing the DI process,
Redrawing must be performed four times, resulting in a significant increase in equipment costs such as dies. Furthermore, since the material plate pressure is extremely thin (for example, 0.147 mm),
The occurrence of problems such as wrinkles becomes more remarkable than the processing of a thick plate, and it becomes extremely difficult to solve this problem.

As a countermeasure, a step of using a thicker material can be considered. In other words, it is expected that the use of a thick material will reduce the number of redrawing steps and reduce the problem of wrinkles. However, in this case, a new problem occurs in that the ironing rate in the ironing process increases. For example, when a material having a thickness of 0.3 mm is used and an ultra-thin tube having a thickness of 50 μm is to be obtained from this material, about 83 μm is required.
% Of the ironing rate would have to be given.

In order to provide such a large ironing rate, it is necessary to perform processing using a total of 7, 8 ironing dies. Due to the structure of the DI press, such a large number of ironing operations can be performed in one stroke. It is impossible to do. Further, when such a large ironing rate is applied, the material is likely to be broken during the ironing due to work hardening of the material, which may cause a problem that stable processing cannot be performed.

Accordingly, the present invention is directed to a method capable of avoiding the above-mentioned problems, and its basic features are that a deep drawing step of a metal material and an annealing step are interposed between the deep drawn product. In addition, the first and second ironing steps are performed using a special die called a floating die.

FIG. 4 shows a process of the present invention, in which a blank having a predetermined thickness is punched into a circular blank 5 having a predetermined size.
The circular blank 5 is deep-drawn to obtain a cup-shaped container 6. Next, the cup-shaped container 6 is set in a DI press, and a primary drawing / ironing (DI) process is performed by a punch, a redrawing die, and a plurality of ironing dies at a predetermined ironing ratio of about 50%, for example. A first ironed product 7 is obtained. Reference numeral 7 'denotes a redrawn product.

Here, the first ironed product 7 is once removed from the punch, and an annealing process is performed to soften the material and improve workability. Reference numeral 8 denotes an annealed product. The annealed product is mounted on the punch again, and a second ironing is performed by a DI press in which a plurality of ironing dies are set to obtain an ultrathin drawn ironed tube body 9. The secondary ironing may be performed with the total ironing rate being a predetermined value, for example, about 67%. Then, the upper edge 90 and the lower edge 91 of the ultra-thin drawn and ironed tube body 9 are cut and removed by a laser processing machine or the like to obtain the ultra-thin drawn and ironed tube 2 which is a seamless belt base material. The processing is preferably performed using a high-speed press in order to obtain a processing limit improvement and a product damage prevention effect by fluid lubrication.

Although the basic steps of the present invention are as described above, the primary and secondary ironing steps are characterized by the use of a floating die. The reason for adopting this is as follows. The dies used in general DI processing are dies having a structure in which a superhard member is shrink-fitted in a holder, and these are arranged coaxially in a retainer in a plurality of stages, for example, four stages including a redrawing die. Have been. When this die was used as a means for producing a metal tube for a fixing belt, there was no problem in the drawing and ironing before annealing, but in the secondary ironing after annealing, material breakage occurred during ironing and processing was performed. Could not be done.

In order to investigate the cause, the present inventors conducted similar experiments with various ironing rates.
It is possible to mold up to a thickness of 80 μm or more, but if it becomes thinner than this, it is not a broken form that is cut over the entire circumferential direction of the molded product, so-called “cutout”,
It has been found that the material breaks in a form in which a part of the circumference of the molded product is turned up and broken, and processing cannot be performed. Also, a phenomenon in which a large deviation occurred in the edge height was observed in a molded product having a thickness of 80 μm or more.

From the above results, in the production of an ultra-thin drawn ironing tube having a wall thickness of 80 μm or less, a slight shift between the center of the punch and the center of each die has a great effect on the possibility of molding. It was found that a material break occurred. In order to solve this, it is conceivable to further improve the manufacturing accuracy of the mold. But,
In a long mold in which dies can be replaced easily and frequently, and the distance between dies is long, it is practically impossible to reduce the displacement.

Therefore, the present invention uses a die that moves following the position of the punch, that is, a floating die having a structure in which the center of the die is automatically aligned with the center of the punch at all times. It was done. FIG. 5 shows an example of the structure of the floating die in use, and reference numeral 10 denotes a floating die. The floating die 10 has a super hard die body 13 in contact with a material in a stepped hole 12 provided in a die holder 11, and a cover 14 is fixed on the upper part of the die holder 11 to be built therein. The gap 15 is intentionally formed between the outer diameter surface 130 of the die holder 11 and the inner diameter surface 120 of the hole 12 of the die holder 11 so that the die body 13 can be freely moved in any radial direction.

The size of the gap 15 (movement amount of the superhard portion) S is determined by the punch 16 and the die body 13 when the punch 16 is pulled up after the product is removed from the punch after forming by the punch 16 and the die body 13. It is necessary to set a value such that the clearance between the punch 16 and the die is 50 μm when a final product having a thickness of 50 μm is manufactured.
m, the clearance amount S is set to 50 μm or less.

In the present invention, the floating dies 10 are arranged in multiple stages as shown in FIG. 6 to perform primary ironing and secondary ironing. In the first ironing step, a drawing die is arranged at the highest position in order to use a drawing together. Thus, as shown in FIG.
Even if the center axis DCL of the hole of the die body 13 is slightly deviated, when the punch 16 with the workpiece is lowered,
The die body 13 automatically moves in the radial direction, so that the central axis PCL of the punch 16 and the central axis D of the hole in the die body 13 are adjusted.
Ironing is performed in a state where the CL matches.

For this reason, there is no occurrence of material breakage in a form in which a part of the circumference of the molded product is turned up and broken, and there is no large unevenness in the edge height. 9 is obtained. In such an ultra-thin drawn and ironed tube element 9, a slightly thicker portion is formed at the bottom portion, but the remaining portion covers the entire circumferential direction, and a desired thickness without uneven thickness is obtained. It shows a tendency not to become larger than the set value. This is because the thickness of the molded product is thin, and the tensile stress in the axial direction acting during the ironing becomes larger than the yield stress of the workpiece. Further, the surface roughness in the circumferential direction is also good. Therefore, the accuracy is excellent, and it is possible to exhibit excellent performance as a photoreceptor belt and a fixing belt.

In the manufacturing process of the present invention, when the wall thickness of the ultra-thin drawn and ironed tube element 9 to be manufactured is close to the upper limit, for example, 70 μm, the diameter of the circular blank 5 is reduced. Increase (eg, 160
mm), a deep drawing step may be interposed between the deep drawn product 6 from the circular blank 5 in FIG. When the thickness is close to the lower limit, the number of primary and secondary ironing steps can be reduced.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, the diameter is 60 mm and the axial length is 3.
A seamless belt substrate having a thickness of 20 mm and a thickness of 0.05 mm (50 μm) was produced. The manufacturing process is as follows. 1) As a material, a 0.3 mm thick aluminum alloy (A
5182-O) material was punched into a circular blank having a diameter of 138 mm, and deep drawing was performed at a drawing ratio of 1.8 to obtain a cup-shaped container having a diameter of 76 mm.

2) The cup-shaped container was set in a DI press, and subjected to drawing and ironing (DI) processing with a punch having a diameter of 60.1 mm, a redrawing die, and a three-stage ironing die, and a thickness of 150 μm. I got the first ironed product. A floating die having a clearance of 150 μm between the die body and the holder was used as each die of the three-stage die, and the total ironing rate by the three-stage die was 50%.

3) Remove the primary ironing product from the punch,
After annealing at 400 ° C for 15 minutes, φ6
A secondary ironing process was carried out with a total ironing rate of 67% by a DI press which was mounted on a 0 mm punch and set a four-stage ironing die using a floating die with a clearance of 50 μm between the die body and the holder. Diameter φ60m
m, a wall thickness of 50 μm and a height of 380 mm were obtained. For primary and secondary ironing, use a high-speed press with a ram speed of 2 m / s.
Synthetic metalworking oil was used.

For comparison, secondary ironing was performed using a die having a structure in which a conventional cemented carbide member was shrink-fitted in a holder portion without using a floating die. In the ironing process after annealing, During the ironing, a part of the circumference of the molded product was turned up and the material was broken, and the material could not be worked.

FIG. 7 shows the measurement results of the wall thickness of the ultra-thin drawn and ironed tube body. Up to about 20 mm from the bottom, a slightly tapered punch was used at the tip, so the wall thickness was increased, and the wall thickness tended to change significantly from the edge to about 30 mm. In the area of about 330 mm excluding the part of, over the entire area in the circumferential direction,
It can be seen that a thickness of about 50 μm can be obtained.

FIG. 8 shows the measurement results of the maximum surface roughness (Ry) in the circumferential direction of the extremely thin drawn ironed tube body.
It can be seen that a surface roughness of Ry of 4 μm or less can be obtained in a portion having a length of about 330 mm excluding unnecessary portions of the bottom and the edge. This roughness is not a problem since the release layer is coated after ironing. 4) The bottom and the edge of the ultra-thin drawn and ironed tube body were cut and removed by a laser processing machine or the like to obtain a desired seamless belt base material. The production capacity of the seamless belt base material was 40 pieces per minute per mold, and the time required for true processing was 0.2 seconds per piece.

The obtained seamless belt base made of an ultra-thin drawn ironing tube is incorporated as a fixing belt of an electrophotographic apparatus equipped with an oil applying device for toner release.
A printing test of 300,000 sheets was performed at a speed of 20 sheets per minute in A4 size, but no deterioration was observed in the print quality.
There was no problem with the durability of the seamless belt.

Example 2 The seamless belt substrate produced in Example 1
Fit a stainless steel dipping jig with a length of 9.9 mm and a length of 400 mm, mask both ends of the seamless belt with 10 mm each, dipping in silicone resin solution, drying, exchanging top and bottom, further dipping, drying and heat curing Thus, a 50 μm thick silicone resin layer was provided to obtain a fixing belt. This is incorporated as a fixing belt of an electrophotographic apparatus, and the A4 size is 2 minutes per minute.
A printing test of 300,000 sheets was performed at a speed of 0 sheets, but no deterioration was observed in print quality, and there was no problem in durability of the seamless belt.

Example 3 A barrier layer made of gelatin and a photoreceptor layer using polycarbonate as a binder were provided in this order on the surface of the seamless belt substrate produced in Example 1, to obtain a photoreceptor belt. This is incorporated into a full-color electrophotographic apparatus, and A
A print test was performed on 100,000 sheets at a speed of 5 sheets per minute in 4 sizes. No deterioration was observed in the print quality, and there was no problem in the durability of the seamless belt.

Comparative Example 1 A 60 mm diameter, 320 mm axial length was obtained by electroforming.
A nickel seamless belt base material having a thickness of 0.05 mm was produced. This was evaluated in the same manner as in Example 1. As a result, there was no problem in print quality and durability, but in terms of production capacity, it took 30 minutes to deposit a nickel layer having a thickness of 0.05 mm. . Further, a waste plating solution was generated and required treatment.

Comparative Example 2 An aluminum foil having a thickness of 0.05 mm was cut out to a predetermined size, and both ends were overlapped with a width of 2 mm and joined with an epoxy-based adhesive to obtain a diameter of 60 mm and an axial length of 320.
An aluminum belt substrate having a thickness of 0.05 mm and a thickness of 0.05 mm was produced. When this was evaluated in the same manner as in Example 1, clear distortion was observed in the image at the joint portion of the belt, and the belt was damaged after printing about 3,000 sheets.

[0048]

According to the present invention described above, the base material for the belt used in the image forming apparatus may be:
Since the base material is made of an ultra-thin drawn ironed tube obtained by drawing a metal material, mechanical strength, thermal conductivity,
An excellent effect is obtained in that a belt having excellent durability, having a uniform wall thickness, and having a favorable surface roughness has characteristics suitable for a belt, and is capable of providing an inexpensive belt with high production efficiency.

According to the second aspect, the ultrathin drawn ironing tube has a relation of L / R ≧ 4 and R / R in relation to the diameter R (mm), the axial length L (mm), and the thickness t (mm). / T ≧
Since it is 500, an excellent effect is obtained in that a seamless belt for a fixing belt or a photoreceptor belt can be provided which has a good balance between mechanical strength, heat resistance, durability and followability and is inexpensive.

According to the third aspect, the ultra-thin drawn ironing tube is provided with a step of deep drawing a metal circular blank and an annealing step interposed between the deep drawn product and the first step of forming a very first using a floating die. And a second ironing process, so that a high-precision fixing belt with uniform thickness and good surface roughness can be produced at extremely high productivity and low cost without wrinkling or material breakage. An excellent effect of mass production can be obtained.

According to the fourth aspect of the present invention, since the ultra-thin drawn ironing tube is covered with the release layer, it is suitable as a belt composed of an endless belt for fixing toner to a medium after transfer, and has good elasticity. The excellent effect that a clear fixed image can be formed in combination with the followability due to the property can be obtained.

According to the fifth aspect, since the photosensitive member layer is provided on the ultra-thin drawn ironing tube, it is suitable as a photosensitive member belt or a drum, has good durability, and achieves follow-up performance with good elasticity. Excellent effect that can be obtained.

[Brief description of the drawings]

FIG. 1A is a schematic explanatory view of an image forming apparatus to which the present invention is applied, FIG. 1B is an explanatory view showing another type of the image forming apparatus, and FIG. FIG.

2A is a front view of a seamless belt substrate according to the present invention, FIG. 2B is a plan view thereof, and FIG. 2C is a partially enlarged view of FIG.

FIG. 3A is a plan view of a fixing belt or a photoreceptor belt to which the seamless belt substrate according to the present invention is applied,
(B) is a partially enlarged view of (a).

FIG. 4 is an explanatory view showing a process of manufacturing a seamless belt substrate according to the present invention.

FIG. 5 is a cross-sectional view illustrating an example of a floating die used in a manufacturing process.

FIG. 6 is a front view of a primary and secondary ironing device using the floating die of FIG. 4;

FIG. 7 is a diagram showing a measurement result of a wall thickness of a side wall portion of an extremely thin drawn ironing tube of an example.

FIG. 8 is a diagram showing the results of measuring the surface roughness of an iron-drawing and drawing ironing tube of an example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing belt or photoreceptor belt 2 Ultra-thin drawing ironing tube 3 Release layer 3 'Photoreceptor layer 10 Floating die

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03G 5/10 G03G 5/10 B 21/00 350 21/00 350 (72) Inventor Masamitsu Hasegawa Central Tokyo 4-7-5 Nihonbashi Honmachi, Shin-Etsu Polymer Co., Ltd. (72) Inventor Satoshi Odashima 4-3-5 Nihonbashi Honmachi, Chuo-ku, Tokyo Shin-Etsu Polymer Co., Ltd. F-term (reference) 2H033 AA23 BA12 BE03 2H035 CA05 CB06 2H068 AA55

Claims (5)

[Claims] 1. A base material for a belt used in an image forming apparatus, wherein the base material is an ultra-thin drawn ironed tube obtained by drawing a metal material, and a seamless belt base material is provided. . 2. An ultra-thin drawn ironing tube having a diameter R (m
2. The seamless belt substrate according to claim 1, wherein L / R ≧ 4 and R / t ≧ 500 in relation to m), an axial length L (mm), and a thickness t (mm). 3. An ultra-thin drawn ironing tube, comprising a step of deep drawing a metal circular blank and an annealing step interposed between the deep drawn product and a first and second order ironing step using a floating die. The seamless belt substrate according to claim 1, which is made by an ironing process. 4. A fixing belt wherein the ultra-thin drawn-ironed tube according to claim 1 is covered with a release layer. 5. A photoreceptor belt in which a photoreceptor layer is provided on the ultra-thin drawn and ironed tube according to claim 1.