JP2002307464A - Method for producing belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive quality belt having no limit in size and shape in a method for producing the belt to be used in transfer by an electrophotographic copying machine. SOLUTION: Solid rubber (unvulcanized rubber) is formed in the shape of a sheet, and a cylindrical base material (rubber elasticity layer) is formed. A plain weave fabric 1 is arranged cylindrically by using a cylinder 2. Next, a thread 3 is arranged spirally in the diameter direction of the cylinder 2 to form a core (core body layer). By a vulcanization apparatus, the base material and the core are molded integrally in a seamless shape by applying air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a belt which can be used as an intermediate transfer belt or a transfer / transport belt of an electrophotographic copying machine or printer.

[0002]

2. Description of the Related Art In electrophotographic copiers, printers, and the like, a belt is used for transferring and fixing toner as a developing material onto recording paper. These belts are conventionally formed of a resin having a small elongation, and in some cases, are provided with a coating layer.

[0003]

However, in the above-mentioned conventional belt, if it is formed only of a resin without an elastic layer, the size and the shape are limited. Therefore, it has been proposed to put fibers as a core layer in the elastic layer. In this case, as shown in FIG. 5, a bag-shaped seamless woven fabric is used. The shape is limited, and in this case, the cost is very high.

The present invention has been made in view of the above-mentioned problems, and has as its object to provide a method of manufacturing a belt which is not limited in size and shape and can be used to obtain a low-cost and high-quality belt. .

[0005]

A method for manufacturing a belt according to the present invention is a method for manufacturing a belt having a core material inside a base material, wherein the base material is formed from a sheet of solid rubber. In addition, the core material is formed by spirally arranging yarns in the radial direction on a woven fabric arranged in a cylindrical shape, and the base material and the core material are integrally formed in a seamless manner.

Further, a method of manufacturing a belt according to the present invention is a method of manufacturing a belt having a core material inside a base material, wherein a belt is provided between a cylindrical outer mold and an inner core mold inside the outer mold. A solid unvulcanized rubber, which is a base material containing a fiber core material formed in a cylindrical shape, is arranged, and vulcanized and integrally molded in a seamless manner by applying air pressure from the inside of the core mold. is there.

Further, in each of the above-mentioned manufacturing methods, a coating layer is provided outside the substrate.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to a method of manufacturing a belt having a core layer having a small elongation and a rubber elastic layer outside the core layer, and further having a release layer outside the rubber elastic layer.
The core layer is composed of fibers, and the fibers are composed of woven fabric and yarn.

FIG. 1 is a diagram showing a process of manufacturing a belt in this embodiment. First, although not shown, a cylindrical substrate (rubber elastic layer) is formed from a sheet of solid rubber. Also, as shown in FIG. 1A, a plain woven fabric 1 is arranged in a cylindrical shape using a cylinder 2, and then, as shown in FIG. A core material (core layer) is formed in a spiral shape. Then, the base material and the core material are integrally formed in a seamless manner.

FIG. 2 is a sectional view showing the structure of a vulcanizing apparatus used in the above-mentioned manufacturing process. In the drawing, 11 is a lower base plate, 12 is a cylindrical outer mold, 13 is an inner core mold, and 14 applies air pressure from the outside of the core mold 13 to the outer mold 12. A cylinder comprising an unvulcanized rubber (base material) 15 as a solid rubber and a plain woven fabric 1 and a thread 3 which is the above-mentioned solid rubber disposed between an outer mold 12 and a core mold 13 in an airbag. Air pressure is applied to the cloth material (core material) 16. Reference numeral 17 denotes a vulcanization chamber for vulcanizing and integrally molding the unvulcanized rubber 15 and the cloth material 16 by the air pressure of the airbag 14.

FIG. 3 is a view showing the unvulcanized rubber 15 and the cloth material 16 arranged in a cylindrical shape. As shown in the figure, a gap t remains when these are laminated in a cylindrical shape.

Next, a specific belt manufacturing process based on the above-described manufacturing method will be described step by step.

(1) A 30-denier polyester plain woven fabric having a thickness of 0.09 mm is cut into 734 mm × 350 mm.

(2) The cut plain woven cloth is arranged on a φ234 cylinder as shown in FIG.

(3) Further, from above, 30 denier polyester yarns are spirally arranged in the radial direction at intervals of 2 mm using a lathe or the like as shown in FIG. 1B. At that time, the woven fabric or yarn without wrinkles or slacks can be formed by brush-coating an organic solvent such as toluene containing an adhesive, or an adhesive rubber or the like in which an unvulcanized rubber and an adhesive are dissolved in an organic solvent. Can be arranged.

(4) From above, CR rubber sheeted with a calender roll to a width of 350 mm and a thickness of 0.58 ± 0.02 mm is cut at 735 mm and pressure-bonded and bonded in a cylindrical shape. At this time, the gap t shown in FIG.
Is 0 to 1.0 mm.

(5) Then, the cylinder of φ234 is extracted, and the unvulcanized rubber 15 and the cloth material (plain woven cloth and yarn) 16 shown in FIG. 3 are put into a vulcanizing apparatus shown in FIG. 2 to be vulcanized. .
At this time, the vulcanized product was unpolished and had a thickness of 0.6 ± 0.02.
mm accuracy can be ensured.

(6) Here, if further thickness accuracy is desired, the accuracy of the thickness of 0.6 ± 0.01 mm can be secured by polishing the surface of the vulcanized product.

(7) Next, a coating is applied to the outside of the vulcanized product to provide a coating layer. That is, as a release layer, a fluorine-based coating material is spray-coated with 6 μm and baked.

(8) Cut both ends of the product after the above coating and firing. As a result, a belt having a predetermined size is obtained.

In the above steps, for example, an intermediate transfer belt can be obtained. However, according to the present embodiment, there is no limitation on the size and shape, and an inexpensive and high-quality belt can be obtained. That is, as shown in FIG. 1 (a), by arranging the plain woven fabric 1 in a cylindrical shape, axial elongation can be suppressed. Also,
By further arranging the yarn 3 helically in the radial direction from above, as shown in (b) of the figure, radial elongation can be suppressed. In this embodiment, the plain woven fabric 1 and the thread 3 may be arranged on the cylinder 2 without using a bag-shaped seamless woven fabric as in the conventional example shown in FIG. It becomes something.

FIG. 4 shows the characteristic data of the belt obtained as described above. Rubber hardness (JISA) is 60, dimensions are 330mm in width, 730mm in inner circumference and 0.59 ~
It was 0.62 mm, the volume resistance was 1 × 10 11 Ω · cm, and the thickness of the release layer was 6 μm.

In the present invention, the woven fabric used as the core material is not limited to a plain woven fabric, but may be knitted or the like. Further, the material of the woven fabric and the yarn is not limited to polyester, and polyamide or the like can be used. In addition, any rubber material can be used.

[0024]

As described above, according to the manufacturing method of the present invention, there is no restriction on the size and shape, and a low-cost and high-quality belt can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a belt according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a vulcanizing apparatus used in a manufacturing process of the embodiment.

FIG. 3 is a perspective view showing an unvulcanized rubber and a cloth material arranged in a cylindrical shape in the embodiment.

FIG. 4 is a diagram showing characteristic data of a belt obtained in an example.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plain woven cloth 2 Cylinder 3 Thread 11 Base plate 12 Outer mold 13 Middle core mold 14 Airbag 15 Unvulcanized rubber 16 Cloth material 17 Vulcanization chamber

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) // B29K 21:00 B29K 21:00 105: 24 105: 24 B29L 29:00 B29L 29:00 (72) Inventor Masaki Fujimori 2-chome, Kojimachi 2-chome, Chiyoda-ku, Tokyo F-term (in reference) 2H200 FA13 FA19 JB07 JB45 JB46 JB47 JC04 JC15 JC16 JC17 LC02 LC03 MA03 MA04 MB04 MC02 3F049 AA10 BA11 LA02 A07ALB4F4 AG16 DA11 DB01 DC01 DL12 DW05 DW38 4F204 AA45 AC03 AD16 AG16 FA01 FA13 FB01 FN15 FN17 FQ37 4F213 AA45 AD16 AG16 AJ09 AM01 WA03 WA14 WA15 WA38 WA39 WA43 WA52 WA64 WA92 WA97 WB01 WB11 WB18 WB02 WW03 WW06 WW03 WW06 WW06

Claims (3)

[Claims] 1. A method for producing a belt having a core material inside a base material, wherein the base material is formed from a sheet of solid rubber, and a yarn is formed on a woven fabric arranged in a cylindrical shape. A method for manufacturing a belt, wherein the core material is formed by being spirally provided in a direction, and the base material and the core material are integrally formed in a seamless manner. 2. A method for manufacturing a belt having a core material inside a base material, wherein the fiber core material is formed into a cylindrical shape between a cylindrical outer mold and a middle mold inside the belt. A method for producing a belt, comprising: arranging a solid unvulcanized rubber, which is a base material containing the rubber, and vulcanizing and integrally molding by applying air pressure from the inside of the core mold. 3. The method for producing a belt according to claim 1, wherein a coating layer is provided outside the base material.