JPH0346257Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The invention relates to a synthetic resin roll for antistatic use.
By being installed and used mainly in the sliding parts of sliding parts of equipment components such as general industrial equipment and OA equipment, it can significantly suppress the generation of noise, vibration, wear, static electricity, etc. in equipment. This invention relates to an antistatic synthetic resin roll.

(Prior technology) Conventionally, rolls mainly used for sliding parts of sliding members as components of automatic doors, OA equipment, etc. are made by coating and fixing high hardness rubber on the outer peripheral surface of a metal core. Alternatively, a metal core with an inelastic material such as polyacetal, polycarbonate, or nylon coated on the outer peripheral surface is used.

(Problems to be solved by the invention) By the way, when the above-mentioned conventional rolls are used, for example, as part of OA equipment and incorporated into the equipment, in the case of rubber rolls, the roll surface is rubber elastic. Although it can certainly achieve good results in terms of suppressing noise and vibration because it is composed of two body layers, there is a problem with the adhesion between the metal core and the rubber elastic body, and peeling may occur due to poor adhesion. There were drawbacks such as separation, early wear of the rubber elastic layer, and imbalance in the coefficient of friction. On the other hand, resin rolls have drawbacks such as high rolling noise and poor vibration absorption properties because the roll surface is hard and inelastic.

In particular, rolls used in OA equipment are often used to feed or transport paper, and static electricity is generated due to friction between the roll and the transported object.
A new problem has arisen that may impede the functionality of the equipment.

The purpose of this invention is to improve and eliminate the above-mentioned problems inherent in conventional rolls.The roll material uses polyurethane resin with excellent wear resistance, and the roll body is made of a hard elastic layer and a soft elastic layer. It has a multilayer structure in which elastic layers are alternately laminated, and the outer peripheral surface layer of the multilayer structure is made conductive, which suppresses the generation of noise, vibration, and static electricity when the roll is used, and provides wear resistance. The purpose is to provide a roll with improved durability and excellent durability.

(Means for solving the problems) In order to achieve the above object, the present invention is characterized by the following configuration. That is, in a synthetic resin roll having a multilayer structure in which the outer peripheral surface of a metal core is coated with at least two alternate layers of hard elastic polyurethane resin layers and soft elastic layers, the outer peripheral surface layer of the multilayer structure is electrically conductive. The structure is made of an elastic body made of conductive polyurethane resin mixed with a conductive material made of carbon black or conductive plasticizer.

(Example) Next, a specific example of the antistatic synthetic resin roll of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an antistatic synthetic resin roll 1 according to the present invention, and FIG. 2 is an enlarged sectional view taken along line A-A in FIG. A soft elastic layer 3 made of polyurethane resin with a Shore A hardness of 70 to 85 degrees on the outer peripheral surface, and a conductive polyurethane resin layer 3 with a Shore A hardness of 90 to 98 degrees on the outside. An elastic layer consisting of a two-layer structure including a hard elastic layer 4' made of 4' is coated and fixed.

This conductive polyurethane resin is made by combining ordinary polyurethane resin with a conductive material, such as a buttchain black.
Conductive carbon black such as acetylene black, conductive plasticizer (Sansocizer: trade name),
to which 0.5 to 4.0 parts by weight of other plasticizers, vulcanizing agents, etc. are added.

If the amount of the conductive material mixed is less than 0.5 parts by weight, preferred conductivity will not be exhibited, and if it is more than 4.0 parts by weight, there will not be much change in the conductive effect and the cost will increase. Moreover, this hard and soft elastic body 3,
Elastic body layer 4' is laminated by integral molding, and is firmly bonded between both elastic layers 3 and 4' so that no permanent deformation or peeling phenomenon occurs due to shear force.

FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment, and is a two-layered structure including a conductive soft elastic layer 3' on the surface of the metal core 2 and a hard elastic layer 4 on the inside thereof. This roll is coated with an elastic layer made of polyurethane resin and is suitable for use in places where low noise is required.

4 and 5 are views corresponding to FIG. 2 showing still another embodiment, and FIG. 4 shows a polyurethane resin elastic body constituting the roll 1, and a hard elastic layer 4 in the middle part. A soft elastic layer 3' is arranged on the inner surface, and a conductive soft elastic layer 3' is arranged on the outer surface.
In contrast, FIG. 5 shows a structure in which a soft elastic layer 3 is disposed in the intermediate portion, a hard elastic layer 4 is disposed on the inner surface, and a conductive hard elastic layer 4' is disposed on the outer surface of the soft elastic layer 3, each having a different hardness. By changing the arrangement, wall thickness, and width of the rolls, the performance characteristics of each roll can be varied, and various rolls can be selected depending on the location of use.

Further, although the outer circumferential surface layer of the roll most commonly has a flat circumferential surface, it goes without saying that the outer circumferential surface layer may have a surface shape with protrusions if necessary.

In addition, the diameter of the mounting hole 5 of the elastic layer located on the inner side that fits into the outer periphery of the metallic core 2 is made slightly smaller than the outer diameter of the core 2,
When attaching the elastic layer to the outer peripheral surface of the metal core 2,
By press-fitting the core 2 into the attachment hole 5, the resin elastic layer is fixed to the core 2 by means of interference fit. This eliminates the need for any adhesive or the like between the core and the rubber layer as in conventional rubber rolls.

(Effects of the invention) The resin roll of the invention is mainly made of polyurethane resin, and by laminating multiple elastic layers with different hardness with conductivity imparted to the outermost layer, noise and static electricity are generated. In addition, compared to conventional resin rolls made of inelastic materials, its vibration absorption properties have been greatly improved, and the elastic layers of different hardness that make up the resin roll are integrally molded to prevent peeling between each layer. can be suppressed,
In addition, by fixing the metal core to the mounting hole in the center of the inner elastic layer using a tightening means, the fixation becomes even stronger, and there is no need to use an adhesive or the like between the core and the elastic layer. Therefore, the fixing means is simple.

In addition, compared to conventional rubber rolls, the durability has been improved by 2 to 3 times, and the combination of multiple polyurethane elastic layers with different hardnesses allows us to create resin rolls with varying performance characteristics. Resin rolls that can be obtained and are suitable for the intended use can be appropriately selected from a wide range.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a synthetic resin roll according to the present invention, Fig. 2 is an enlarged sectional view taken along line A-A in Fig. 1, and Figs. FIG. 2 is a diagram corresponding to FIG. 2 showing an example; In the figure, 1 is a synthetic resin roll, 2 is a metal core, 3 is a polyurethane soft elastic layer, 3' is a conductive polyurethane soft elastic layer, 4 is a polyurethane hard elastic layer, and 4' is a conductive A soft elastic layer made of polyurethane, 5 indicates a mounting hole.

Claims (1)

[Claims for Utility Model Registration] 1. A synthetic resin roll having a multilayer structure in which the outer peripheral surface of a metal core is coated with at least two layers of hard elastic polyurethane resin layers and soft elastic layers thereof alternately laminated, An antistatic synthetic resin roll characterized in that the outer peripheral surface layer of a multilayer structure is formed of an elastic body made of a conductive polyurethane resin mixed with a conductive material made of conductive carbon black or a conductive plasticizer. 2. The antistatic synthetic resin roll according to claim 1, wherein the outer peripheral surface layer is made of a hard elastic material made of conductive polyurethane resin. 3. The antistatic synthetic resin roll according to claim 1, wherein the outer peripheral surface layer is made of a soft elastic material made of conductive polyurethane resin. 4. The fixing means of the attachment hole provided at the center of the elastic layer to the metal core is implemented by interference fit. Antistatic synthetic resin roll. 5. The antistatic synthetic resin roll according to any one of claims 1 to 4, wherein the polyurethane resin hard and soft elastic layers are formed by integral molding.