JP2002127357A - Sleeve roller using carbon fiber reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve roller which prevents electrostatic charge when using the sleeve roller, allows repeated rewinding of a rubber material and inhibits to the minimum declination and displacement of a sleeve and a mandrel without complicating structures of both the sleeve and the mandrel by generating a strong holding power between the sleeve and the mandrel. SOLUTION: The sleeve roller is provided with metal mandrels 11 and 12, a carbon fiber reinforced plastic sleeve 13, and an electrically conductive rubber layer 14 formed on an outer peripheral surface of the carbon fiber reinforced plastic sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve roller using carbon fiber reinforced plastic which is used as an impression cylinder roller, a plate roller, a coating roller, and a conveyance roller in gravure printing, flexographic printing, laminating adhesive coating, film production, and the like. It is about.

[0002]

2. Description of the Related Art An impression cylinder roller of a gravure printing machine, a plate cylinder roller of a flexographic printing machine, a painting roller of a laminating machine, or an impression cylinder roller, a plate roller, a painting roller, and a transport roller used in film production, etc. It is necessary to frequently change the lining width of each roller according to the width of the processing object. In the past, rollers having various lining widths were prepared, and the entire rollers were replaced according to the width of the workpiece. The higher the frequency of this replacement work, the more replacement work time and labor are required.

In order to reduce the time and labor required for roller replacement work, for example, as disclosed in Japanese Patent Application Laid-Open No. 61-160251, the roller lining is made a sleeve type,
For a predetermined mandrel (one end is fixed to a machine) serving as a roller shaft core, a sleeve roller of a type in which a sleeve can be easily exchanged by using air pressure is often used.

[0004] As a sleeve of the sleeve roller, a metal sleeve such as a glass fiber reinforced plastic (GFRP) sleeve, which is a kind of fiber reinforced plastic material, and a nickel sleeve is generally used. In the case of nickel sleeves, the thickness of the sleeve is limited from the viewpoint of mounting properties and costs, and a sleeve having a thickness of about 0.1 mm is used. Therefore, it is difficult to repeatedly wrap the rubber material. Not available. Therefore, GFRP sleeves are often used.

[0005] The conventional GFRP sleeve has extremely high electrical properties as an insulating property. Therefore, static electricity is easily charged when the sleeve roller is used, and unevenness in the process caused by static electricity such as printing unevenness in gravure printing and ignition due to discharge. There is a risk of failure. In addition, the conventional GFRP sleeve generally has poor heat resistance and moisture resistance, and when the rubber material is replaced, the inner surface of the sleeve deteriorates due to the steam used for the steam vulcanization of the rubber. However, it is still difficult and the number of reuses is reduced. In addition, in the conventional GFRP sleeve, since the elasticity of the glass fiber is relatively small, the gas pressure required for deformation is low, so that the force for gripping the mandrel is small. Therefore, in a printing roller to which a large external pressure is applied due to high-speed rotation or the like, the sleeve may be slightly displaced with respect to the mandrel, causing displacement.

In order to prevent such displacement and displacement of the sleeve, it has been proposed to inject cement or a thermoplastic adhesive between the sleeve and the mandrel. However, when the cement is injected, the detachment of the sleeve becomes impossible, and when the thermoplastic adhesive is injected, the detachment requires heating. Further, according to the above-mentioned Japanese Patent Application Laid-Open No. 61-160251, in addition to the sleeve attaching / detaching method using gas pressure,
A method is disclosed in which a sleeve and a mandrel are provided with a key and a keyway to prevent displacement and displacement of the sleeve. However, such a method may complicate the structure of the sleeve and the mandrel and increase manufacturing costs. Also, the work of attaching and detaching the sleeve and the mandrel becomes complicated.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, that is, to prevent static electricity from being charged when a sleeve roller is used,
Enables repeated rewinding of the rubber material and minimizes the displacement and displacement of the sleeve and mandrel without complicating the structure by generating a strong gripping force between the sleeve and the mandrel It is possible to provide a sleeve roller.

[0008]

According to the present invention, there is provided a sleeve roller comprising a metal mandrel and a fiber reinforced plastic (CFRP) sleeve, wherein the fiber reinforced plastic sleeve is made of carbon fiber reinforced plastic. A sleeve roller, wherein a sleeve made of a carbon fiber reinforced plastic is used to cover an outer peripheral surface of the sleeve made of a carbon fiber reinforced plastic with a conductive rubber layer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sleeve roller according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view of a typical example of the sleeve roller of the present invention. The sleeve roller has a metal mandrel composed of mandrel shafts 11, 11 'and a hollow mandrel body 12, a CRFP sleeve 13, and a conductive rubber layer 14.

One of the features of the present invention is that, instead of GFRP, which has a high insulating property, as a sleeve material, C
The use of FRP. In order to appropriately prevent electrostatic charging, the volume resistivity of the conductive CRFP is 1.0 ×
It is preferably 10 ¹ Ωcm or less. As the reinforcing carbon fiber, a PAN-based or pitch-based carbon fiber having conductivity is used. Since carbon fiber has a higher elastic modulus than glass fiber, the use of CFRP can generate a strong gripping force between the sleeve and the mandrel. In general,
Although the elastic modulus of glass fiber is 73 GPa, in the present invention,
It is preferable to use carbon fibers having an elastic modulus of 235 GPa or more. As the matrix resin of CFRP, it is preferable to use a resin having heat resistance and moisture resistance, such as an epoxy resin and a phenol resin. When such a resin is used, the rubber material can be repeatedly wound.

Another feature of the present invention is that the periphery of the CFRP sleeve is covered with a conductive rubber lining. In order to effectively dissipate static electricity, the volumetric efficiency of the conductive rubber is preferably 1.0 × 10 ⁸ Ωcm or less. The conductive rubber is a rubber composition in which a conductive material, for example, carbon fiber, carbon particles, metal powder, or the like is blended with rubber so as to obtain a desired volume resistivity. The type of rubber is
Although not particularly limited, acrylonitrile-butadiene rubber (NBR), ethylene-propylene rubber (EPD)
M), chloroprene rubber (CR), styrene-butadiene rubber (SBR), hydrin rubber (CO), silicone rubber and the like are preferable.

The metal mandrel is the same as that used in prior art sleeve rollers. Usually, the mandrel is a hollow mandrel composed of mandrel shafts 11, 11 'and a hollow mandrel body 12. One mandrel shaft 11 has a hole 1 for injecting pressurized gas.
5 is provided, and a hole 16 for letting out the injected pressurized gas is provided in the hollow mandrel body 12. The sleeve 13 and the conductive rubber layer 14 are expanded by the pressurized gas flowing out of the hole 16, the inner diameter of the sleeve is slightly expanded, and the sleeve 13 can be easily detached from the mandrel.

The outer surface of the mandrel body and the inner surface of the sleeve may be straight (ie, the outer diameter of the mandrel body and the inner diameter of the sleeve are constant over its entire length) or slightly tapered. The taper facilitates attachment and detachment of the sleeve from the mandrel.

The CFRP sleeve of the present invention is a conventional GF sleeve.
The RP sleeve can be formed around the molding mandrel by the same method as the method for manufacturing the RP sleeve. For example, a filament winding method in which a continuous fiber is impregnated with a resin and wound around a rotating molding mandrel at a predetermined angle, or a prepreg, which is a fiber material pre-impregnated with resin, is wound around a rotating molding mandrel. A sheet winding method, a pultrusion method, a braiding method, or the like can be employed. Among them, the sheet winding method and the filament winding method are preferable because the orientation angle of the reinforcing fibers can be relatively arbitrarily selected within a range of 0 to 90 degrees so that the CFRP sleeve has desirable characteristics. After winding the resin-impregnated fiber, the matrix resin is cured by heating, the mandrel for molding is pulled out, and the CR
Obtain an FP sleeve. The curing conditions for the matrix resin are as follows:
Although it depends on the type of the resin, it may be heated at a temperature of 120 to 220 ° C. for a predetermined time.

The conductive rubber layer can be formed by the same method as in the case of a usual rubber roller lining process. For example, a mandrel provided with a sleeve is prepared, and an adhesive is applied to the surface of the sleeve. After drying the adhesive, the outer periphery of the sleeve is covered with a conductive rubber compound formed into a sheet by a calender, and then vulcanized and polished to a predetermined size.

[0016]

Since the CFRP sleeve roller of the present invention has a small charge of static electricity, when it is used as various rollers of a printing machine, a film manufacturing machine and the like, it is caused by static electricity such as uneven printing and ignition by electric discharge. Process obstacles can be reduced. In addition, since CFRP using carbon fiber having a higher elastic modulus than glass fiber is used for the entire sleeve, a strong gripping force can be generated between the sleeve and the mandrel without complicating the structure. Can be. Furthermore, if a heat-resistant and moisture-resistant resin is used as the matrix resin of CFRP, rewinding of the rubber material becomes possible repeatedly.

[0017]

EXAMPLE 1 A) Production of CFRP Sleeve A PAN-based carbon fiber having an elastic modulus of 235 GPa was wound around a forming mandrel having a 1/1000 taper by a filament winding method while impregnating with a heat-resistant epoxy resin. The epoxy resin was cured by heating at 190 ° C. Then, the mandrel for molding is pulled out, and the outer diameter 1
CRF of 31mm, inner diameter 127mm, length 1050mm
A P sleeve was obtained. 1/100 on the inner surface of this sleeve
The taper was 0.

B) Formation of conductive rubber lining Same as product mandrel used for actual roller products 1
A sleeve manufactured in step A) was applied to a mandrel for rubber lining having a taper of / 1000 with a pressure of 0.7.
While injecting 84MPa pressurized air into the mandrel,
I attached it. The sleeve was fixed to the processing mandrel by returning the air pressure to normal pressure. Thereafter, the volume resistivity was 1.
0 × 10 ⁷ Ωcm antistatic rubber compound rubber (acrylonitrile = butadiene rubber (NBR)) 100 parts by weight Conductive component (conductive carbon) 60 parts by weight Other additives (reinforcing filler, plasticizer, vulcanization) And a vulcanization accelerator) were applied to the outer periphery of the mandrel in the same manner as in the usual rubber roller lining process, and vulcanized at 150 ° C. Next, the rubber surface was polished to a predetermined size, and pressurized air having a pressure of 0.784 MPa was again injected into the processing mandrel, and the rubber-lined CFRP sleeve was removed from the processing mandrel.

The manufactured sleeve roller of the present embodiment is
It was used as an impression cylinder roller for a gravure printing machine. Since the sleeve roller of the present invention has the conductive rubber lining, the electrostatic charge is small, and it is possible to reduce troubles in the process due to static electricity such as uneven printing and ignition due to discharge. In addition, since a heat-resistant and moisture-resistant epoxy resin is used as the matrix resin of the CFRP of the sleeve, it was possible to repeatedly change the rubber material.

The sleeve provided with the rubber lining manufactured as described above was mounted on a uniaxially fixed product mandrel while injecting pressurized air at a pressure of 0.784 MPa.
Installation was easy. By returning the air pressure to normal pressure,
The sleeve and the product mandrel were fixed with a strong gripping force. Again, pressurized air at a pressure of 0.784 MPa was injected into the product mandrel fixed to one axis, and the sleeve was removed. It was easy to remove.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a preferred example of a sleeve roller of the present invention.

[Explanation of symbols]

11, 11 ': mandrel shaft, 12: hollow mandrel trunk, 13: CRFP sleeve, 14: conductive rubber layer.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B65G 39/07 B41F 13/10 Z (72) Inventor Isao Kurata 7-11-11 Nishigotanda, Shinagawa-ku, Tokyo No. Within Nippon Steel Chemical Co., Ltd. (72) Inventor Koichi Kishimoto 3-8 Nihonbashi Kobunacho, Chuo-ku, Tokyo Nippon Composite Corporation F-term (reference) 3F033 GB06 GC06 GE01 HA01 4F100 AA37C AA37H AB00A AD11B AK27C AK29C AK53 AL01C AN02C BA03 BA06 BA10C CA21C CA21H DA11 DA11A DG01B DH02B GB41 GB51 JG01C JG03

Claims (1)

[Claims] 1. A sleeve roller comprising a metal mandrel and a fiber reinforced plastic sleeve, wherein a carbon fiber reinforced plastic sleeve is used as the fiber reinforced plastic sleeve, and an outer peripheral surface of the carbon fiber reinforced plastic sleeve is made of conductive rubber. A sleeve roller, characterized by being coated with a layer.