KR20070050229A - Fiber disk and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fiber disk and a method of manufacturing the same.

A fiber disk, comprising: a circular disk-shaped pulp fiber (11) having a coupling hole in a central portion thereof; A first adhesive layer 12 formed by applying a first adhesive on the pulp fiber 11; An abrasive 13 coated on top of the first adhesive layer 12; A second adhesive layer 14 formed by applying a second adhesive on top of the first adhesive layer 12 to which the abrasive 13 is applied; Characterized in that it consists of a back coating layer 15 coated on the lower portion of the pulp fiber 11,

Using a single pulp fiber as a base material, safety is improved even at high rotational speeds, and safe work is possible, and it can be used as a single fiber disk without overlapping two existing fiber disks and achieves high efficiency safety. It is possible to improve the grinding property, and to form the back coating layer on the lower part of the disk, which can improve the warpage of the disk, and it does not cause environmental problems because it uses pulp, an eco-friendly material that is harmless to the human body. .

Fiber, Disc, Polishing, Forming

Description

Fiber disk and manufacturing method thereof

1 is a block diagram showing the configuration of a conventional polishing disk.

2 is a block diagram showing the configuration of a fiber disk according to an embodiment of the present invention.

Figure 3 is a perspective view showing a roll coater for manufacturing a fiber disk according to an embodiment of the present invention.

Figure 4 is a perspective view showing the bound type of the fiber disk according to an embodiment of the present invention.

5 is a plan view showing the bound type of the fiber disk according to an embodiment of the present invention.

Figure 6 is a side view showing the bound type of the fiber disk according to an embodiment of the present invention.

Figure 7 is a longitudinal cross-sectional view showing the bound type of the fiber disk according to an embodiment of the present invention.

8 is a plan view showing the one-bound type of the fiber disk according to an embodiment of the present invention.

Fig. 9 is a side view showing the one-bound type of the fiber disk according to the embodiment of the present invention.

Figure 10 is a cross-sectional view showing a one-bound type of fiber disk according to an embodiment of the present invention.

11 is a plan view showing a planar shape of a fiber disk according to an embodiment of the present invention.

12 is a longitudinal sectional view showing a planar shape of a fiber disk according to an embodiment of the present invention.

13 is a graph showing the grinding amount of the fiber disk according to an embodiment of the present invention.

14 is a graph showing the amount of wear of a fiber disk according to an embodiment of the present invention.

15 is a flowchart illustrating a method of manufacturing a fiber disk according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

11: pulp fiber 12: first adhesive layer

13: abrasive 14: second adhesive layer

15: back coating layer 100: bound disk

110: coupling hole 111: punching groove

120: coupling portion 130: bending portion

140: grinding part 200: one-bound disk

210: coupling hole 211: punching groove

300: planar disk 310: coupling hole

α, β: tilt angle RA: vertical radius of curvature

RB: Horizontal curvature radius

The present invention relates to a fiber disk and a method for manufacturing the same. More specifically, using a single pulp fiber as a base material, safety is improved even at high rotational speeds, and safe operation is possible. It can be used as a single fiber disk without work, achieves high efficiency of safety, improves the grinding property, and forms the back coating layer on the lower part of the disk to improve the warpage of the disk, The present invention relates to a fiber disk and a method of manufacturing the same, which do not cause environmental problems because pulp, which is a harmless eco-friendly material, is used.

In general, in order to grind welds of automobiles and mechanical devices, abrasive discs having a plurality of abrasive materials attached to them have been widely used in air tools or grinders that are electric tools. In the manufacture of such a polishing disk, a plurality of abrasive pieces were attached to the bottom of the disc-shaped base plate to manufacture the polishing disk.

In particular, the fiber disk is a kind of abrasive disk, which is a slipping process such as rust removal of welding parts and paint coating parts of ships, automobiles and aircrafts, surface processing of general metals and special metals, nonferrous metals, nonmetals, stainless steel, It is used for surface processing of marble, concrete, glass, plastic and ceramics.

In the conventional abrasive disc, as shown in Fig. 1 showing the structure of the conventional abrasive disc, glass fibers and carbon fibers impregnated with phenol resin are laminated on a nonwoven fabric to produce a disc-shaped base material 6, and a back sheet. (1) The first adhesive layer 2 is formed by applying an adhesive resin on the upper portion, and the abrasive 3 is attached and dried firstly, then the adhesive resin is applied thereon and then dried secondly to obtain a second adhesive layer ( 4) was formed to produce an abrasive cloth. A conventional method for manufacturing a polishing disk is disclosed in Korean Patent Publication No. 10-0469222 (2005.02.02).

Thus, the conventional abrasive disc was manufactured by attaching the abrasive cloth through the adhesive 5 on the disc-shaped base material 6 on which glass fibers and carbon fibers were laminated on a nonwoven fabric, and heating and pressing.

Therefore, the conventional abrasive disc is coated with an adhesive by glass fiber, carbon fiber, and fabrication process and dried for each process to manufacture the cloth (cloth backing), so excessive work time is required for impregnation and fabrication process and drying time is also required. There was a problem in that excessively consumed productivity deterioration.

A method of manufacturing a backing sheet by applying an adhesive on both sides and directly forming an abrasive layer thereon, in which the production time of the backsheet is relatively long when the substrate is manufactured in rolls, thereby increasing production costs. There was a problem becoming

In addition, a considerable time is required for drying the adhesive 5 even in a manufacturing process in which the polishing cloth is adhered to the disk-shaped substrate 6 on which glass fibers and carbon fibers are laminated, via an adhesive 5, and heated and pressed to complete the polishing disk. Since the manufacturing cost increases further, the conventional polishing disk has a problem that the manufacturing process is complicated.

In addition, in the conventional fiber disk, since the thickness of the substrate is 0.8 to 1.2 mm, it is easy to deform, so that two fiber disks are overlapped to prevent this. However, since there is a gap between the fiber disks, poor polishing work is frequently performed. There was also a problem that occurred.

The present invention has been made in order to solve the above-mentioned conventional problems, by using a single pulp fiber as a base material, the safety is improved even at high rotational speed, and safe operation is possible, using two layers of existing fiber disks It can be used as a single fiber disk without work, achieves high efficiency of safety, improves the grinding property, and forms the back coating layer on the lower part of the disk to improve the warpage of the disk, Its purpose is to provide fiber disks that do not cause environmental problems because pulp, which is a harmless and eco-friendly material, is used.

Another object of the present invention is to use a single pulp fiber to simplify the manufacturing process, to reduce the manufacturing time and manufacturing cost, and to shape the disk in a bound, one-bound and planar shape, various grinding parts And it provides a method for producing a fiber disk that can be usefully used in polishing conditions.

The present invention for achieving the above object is a fiber disk, a circular disk-shaped pulp fiber (11) having a coupling hole in the center; A first adhesive layer 12 formed by applying a first adhesive on the pulp fiber 11; An abrasive 13 coated on top of the first adhesive layer 12; A second adhesive layer 14 formed by applying a second adhesive on top of the first adhesive layer 12 to which the abrasive 13 is applied; Characterized in that the back coating layer 15 is coated on the lower portion of the pulp fiber (11).

More preferably, the pulp fiber 11 has a thickness of 1.6 to 2.5 mm.

More preferably, the back coating layer 15 is a urethane resin and a curing agent is characterized in that the roll coating is mixed in a mixing ratio of 40:10 to 60:10.

More preferably, the shape of the fiber disk is characterized in that it is molded into the bound disk 100, one-bound disk 200 or planar disk (300).

More preferably, the bound disk 100 is coupled to the coupling portion 120 formed on the outer periphery of the coupling hole 110, the bent portion 130 formed on the outer periphery of the coupling portion 120, and the bending Consisting of the polishing portion 140 formed on the outer periphery of the portion 130, the bent portion 130 is bent at an inclination angle (α) of 15 to 45 ° with respect to the coupling portion 120, the polishing portion 140 Is bent at an inclination angle β of 5 to 8 ° with respect to the coupling portion 120.

More preferably, the one-bound disk 200 is characterized in that the curvature radius (RA) in the vertical direction is curved to 550 to 600R, the curvature radius (RB) in the horizontal direction is curved to 450 to 550R.

In addition, the present invention for achieving another object, the method of manufacturing a fiber disk, the step of punching the pulp fiber 11 in the shape of a disk (S11); Forming a first adhesive layer (12) by applying a first adhesive on the punched disc-shaped pulp fiber (11) (S13); Applying an abrasive (13) on top of the first adhesive layer (12) (S14); Forming a second adhesive layer 14 by applying a second adhesive on the first adhesive layer 12 to which the abrasive 13 is applied (S15); Drying, curing and correcting the pulp fiber (11) having the polishing layer formed thereon, and coating the lower portion of the pulp fiber (11) to form a back coating layer (15); It characterized in that it comprises a step (S20) of molding the back-coated pulp fiber (11).

More preferably, in the step (S20) of forming the pulp fiber 11, the pulp fiber 11 is heat-treated at a temperature of 100 ~ 200 ℃ in a drying furnace, characterized in that for 5 to 60 seconds by pressing do.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is a block diagram showing the configuration of a fiber disk according to an embodiment of the present invention, Figure 3 is a perspective view showing a coating roll for manufacturing a fiber disk according to an embodiment of the present invention, Figure 4 is a view of the present invention Figure 5 is a perspective view showing the bound type of the fiber disk according to one embodiment, Figure 5 is a plan view showing the bound type of the fiber disk according to an embodiment of the present invention, Figure 6 is a fiber disk according to an embodiment of the present invention Figure 7 is a side view showing the bound type, Figure 7 is a longitudinal sectional view showing the bound type of the fiber disk according to an embodiment of the present invention, Figure 8 is a plan view showing a one-bound type of the fiber disk according to an embodiment of the present invention 9 is a side view illustrating a one-bound type of a fiber disk according to an embodiment of the present invention, and FIG. 10 is a fiber disk according to an embodiment of the present invention. Fig. 11 is a plan view showing a planar shape of a fiber disk according to an embodiment of the present invention, and Fig. 12 is a longitudinal sectional view showing a planar shape of a fiber disk according to an embodiment of the present invention. 13 is a graph showing the grinding amount of the fiber disk according to an embodiment of the present invention, Figure 14 is a graph showing the wear amount of the fiber disk according to an embodiment of the present invention.

As shown in FIG. 2, the fiber disk according to the present embodiment is made of a pulp fiber 11, a first adhesive layer 12, an abrasive 13, a second adhesive layer 14, and a back coating layer 15.

Pulp fiber 11 is mainly composed of linter pulp (cotton pulp), wood pulp (wood pulp), the main components of the fiber cellulose (fiber cellulose) 90 ~ 92%, moisture It contains 6.5 to 8.5% of moisture, 0.01 to 0.04% of zinc chloride and 2.0 to 3.0% of ash.

In particular, the pulp fiber 11 of the present embodiment is used as a cloth backing of a fiber disk having a thickness of 1.6 to 2.5 mm as a single sheet of pulp fiber thicker than the conventional fiber thickness. That is, when the thickness of the pulp fiber 11 is thinner than 1.6 mm, deformation is likely to occur as in the case of conventional fiber disks, and when the thickness is thicker than 2.5 mm, not only the workability is lowered but also the manufacturing cost increases, thus, 1.6 to 2.5 mm. It is preferable to use a pulp fiber 11 having a thickness of.

Therefore, by using two conventional fiber disks, the polishing operation can be performed with a single fiber disk without the inconvenience of frequent defects. In addition, since a single sheet of pulp fiber made of a single material is used as a base material, safety is improved even at high speeds, thereby enabling safe work.

In addition, the pulp fiber 11 processes a sheet having a predetermined size into a circular disk shape in which a coupling hole is formed in the center by a press, and forms a punching groove around the coupling hole to be used as a substrate for the fiber disk. In addition, the main component is made of pulp and excellent adhesive strength with the material of the adhesive or other materials can be produced a fiber disk with improved fracture strength.

The first adhesive layer 12 is formed by applying a primary adhesive on top of the pulp fiber 11. For example, it is preferable to use a mixture of a synthetic resin adhesive such as phenol and calcium carbonate (CaCO ₃ ) as the primary adhesive. In addition, the synthetic resin adhesive and calcium carbonate are more preferably mixed in a mixing ratio of 50:30.

The abrasive 13 is applied in the form of particles on top of the first adhesive layer 12 to adhere to the first adhesive layer 12. For example, as the abrasive 13, aluminum oxide, silicon carbide, alumina zirconium, ceramic, or the like is preferably used.

In addition, the particle size of the abrasive 13 is preferably 14 to 180 mesh (mesh), and the application of the soft medium 13 is electrostatic painting (electrostatic painting) to apply the abrasive evenly over a large area using static electricity The abrasive 13 is adhered to the first adhesive layer 12 by using a gravity coating method using a) method or a natural fall of the abrasive.

The second adhesive layer 14 is formed by applying a secondary adhesive on top of the first adhesive layer 12 to which the abrasive 13 is applied. For example, it is preferable to use a mixture of a synthetic resin adhesive such as phenol and calcium carbonate (CaCO ₃ ) as the secondary adhesive. In addition, the synthetic resin adhesive and calcium carbonate are more preferably mixed in a mixing ratio of 50:40.

In addition, the first adhesive layer 12 and the second adhesive layer 14 are, for example, three of the upper auxiliary roll 21, the coating roll 22 and the adhesive supply roll 23, as shown in FIG. It is preferable that an adhesive is applied and formed by a rubber roll coater which consists of two rubber rolls and applies the adhesive 24 contained in the coating plate 25.

The back coating layer 15 is formed by coating the lower portion of the pulp fiber (11). For example, the back coating layer 15 is preferably coated with a mixture of a urethane resin and a curing agent. In addition, when the mixing ratio of the urethane resin and the curing agent is less than 40:10, since the curing agent is expensive, the manufacturing cost is increased. If the mixing ratio of the urethane resin and the curing agent is higher than 60:10, the curing agent is insignificant and hardening does not occur or excessive curing time is required. Therefore, the mixing ratio of the urethane resin and the curing agent is preferably mixed in a mixing ratio of 40:10 to 60:10, more preferably in a mixing ratio of 50:10.

Like the first adhesive layer 12 and the second adhesive layer 14, the back coating layer 15 is preferably roll coated with a urethane resin and a curing agent by a rubber roll coating machine. For example, amines such as aromatic diamine, which is a curing agent for urethane, are mainly used as the curing agent, but various curing agents for curing the urethane are not limited thereto.

The shape of the fiber disk of this embodiment is shaped into a bound disk 100, a onebound disk 200 or a planar disk 300.

As shown in FIGS. 4 to 7, the bound disk 100 has a coupling hole 110 formed at a central portion thereof, a coupling portion 120 formed at an outer circumference of the coupling hole 110 formed at the center thereof, and the coupling portion 100. The bending portion 130 is formed to extend to the outer circumference of the 120 and the polishing portion 140 is formed to extend to the outer circumference of the bent portion 130.

In addition, six punching grooves 111 are formed on the outer circumference of the coupling hole 110 of the bound disk 100. Therefore, the punching groove 111 formed at the outer circumference of the coupling hole 110 provides flexibility to the coupling hole 110 when the fiber disk is coupled to the polishing tool, thereby facilitating the coupling.

The bent portion 130 of the bound disk 100 is bent at an inclination angle α of 15 to 45 degrees with respect to the coupling portion 120, and the polishing portion 140 is 5 to 8 degrees with respect to the coupling portion 120. It is preferable to bend at the inclination angle β of.

In addition, the bound disk 100 is bent portion 130 is formed between the coupling portion 120 and the polishing portion 140, and the safety and prevention of warpage than the one-bound disk 200 and planar disk 300, etc. This improved shape has been improved so that it can be used as a single-fiber fiber disk by improving the use of two conventional fiber disks.

As shown in FIGS. 8 to 10, the one-bound disk 200 has a coupling hole 210 formed at a central portion thereof, a polishing portion 220 formed at an outer circumference thereof, and a vertical direction of the polishing portion 220. The curvature radius RA is bent to 550 to 600R, and the curvature radius RB in the horizontal direction is bent to 450 to 550R.

Therefore, the one-bound disk 200 is mainly used for a large air tool having a weight of about 7 ", and the weight of the large air tool is excessively applied to the abrasive adsorption surface of the polishing unit 220, so that the fiber disk By shaping the polishing unit 220 of the one-bound type to reduce the load received by the polishing adsorption surface.

In addition, six punching grooves 211 are formed on the outer circumference of the coupling hole 210 of the one-bound disk 200. Therefore, the punching groove 211 formed at the outer circumference of the coupling hole 210 provides flexibility to the coupling hole 210 when the fiber disk is coupled to the polishing tool, thereby facilitating the coupling.

As shown in FIGS. 11 and 12, the planar disk 300 has a coupling hole 310 formed in a central portion thereof, and a polishing surface 320 of the outer circumference thereof is formed in a planar shape so that the polishing portion of the workpiece is flat. Mainly used for

In addition, the fiber disk of the present embodiment substitutes pads around the coupling hole 110 of the bound disk 100, the coupling hole 210 of the one-round disk 200, and the coupling hole 310 of the planar disk 300. As acryl and tin plate or iron plate are combined, it is possible to combine directly without the use of pads such as aluminum and rubber plate when bonded to the air (Air) sanding machine.

As shown in FIG. 13 and FIG. 14, the grinding amount and the wear amount of the fiber disk and the comparative material of this embodiment are shown graphically as a result of the physical property test of the fiber disk of this embodiment.

Experimental conditions include an automatic polishing tester (automatic air polishing machine) with a fiber disk with an outer diameter of 7 ", a particle size of # 24 mesh, a 1.2mm, 1.6mm thickness, and a conventional abrasive disk of other companies with the same outer diameter and particle size at a rotational speed of 7000rpm. The cylindrical steel as a workpiece was polished for 1 hour while being rotated by.

As a result, the fiber disk (thickness: 1.6 mm) of this embodiment is similar to the fiber disk having a thickness of 1.2 mm and the conventional polishing disk in the amount of wear, but the fiber disk and the conventional polishing disk having a thickness of 1.2 mm in the grinding amount. It was found that the increase was about 8-14% and 4-7%, respectively.

Therefore, the fiber disk of the present embodiment can increase the amount of grinding without lowering the amount of wear, and can be used as a single sheet of disk, thereby improving workability and productivity.

Hereinafter, a method of manufacturing a fiber disk according to a preferred embodiment of the present invention will be described in detail with reference to FIG. 15, which is a flowchart showing a method of manufacturing a fiber disk according to an embodiment of the present invention.

First, in order to manufacture a pulp fiber, which is a base material of a fiber disk, a pulp fiber sheet of a predetermined standard is punched into a disk shape by a press to form a coupling hole (S11). A trademark, a product specification, and the like are printed on the lower portion of the punched disc-shaped pulp fiber 11 (S12).

The first adhesive layer 12 is formed by applying a primary adhesive mixed with a synthetic resin adhesive and calcium carbonate (CaCO ₃ ) at a predetermined ratio on the printed disk-shaped pulp fiber 11 (S13). The abrasive 13 of a predetermined standard is coated on the first adhesive layer 12 by using an electrostatic coating method or a gravity coating method to attach the abrasive 13 (S14). The second adhesive layer 14 is formed by applying a secondary adhesive obtained by mixing a synthetic resin adhesive and a filler at a predetermined ratio on the first adhesive layer 12 to which the abrasive 13 is applied (S15).

The pulp fiber 11, which is composed of the first adhesive layer 12, the abrasive 13 and the second adhesive layer 14, and has a polishing layer, is plate dried in an oven at 60 to 120 ° C. for 6 to 10 hours ( S16). The dried pulp fiber 11 is put into a hardening chamber while pressed by a hydraulic compressor and cured at 80 to 130 ° C. for 15 to 18 hours (S17). Humidified in the hardened pulp fiber 11 and pressed by a hydraulic compressor to correct (S18). A urethane resin and a curing agent are mixed and coated on the lower surface of the pulp fiber 11 at a mixing ratio of 40:10 to 60:10 to form a back coating layer 15 (S19).

The pulp fiber 11 having the back coating layer 15 formed thereon is heat-treated at a temperature of 100 to 200 ° C. in a drying furnace, and is molded and cooled by a press for 5 to 60 seconds to complete the fiber disk (S20).

For example, in a drying furnace, it is preferable to apply the heat treatment temperature at 100 to 200 ° C. because the moldability of the fiber disk is lowered when the heat treatment temperature is lower than 100 ° C., and the fiber disk may be damaged by the high temperature. .

In addition, it is preferable to apply the molding time by 5 to 60 seconds because the molding time is shorter than 5 seconds and the fiber disk is not formed, and when the molding time is longer than 60 seconds, the molding time is excessively increased and the production cost increases.

The finished fiber disk is packed and shipped (S21).

<Example>

 First, 1 sheet of width 1420 mm × 2100 mm length pulp fiber sheet of Japan's Toyo Fiber Co., Ltd. was put into a press equipped with a disc mold having a predetermined outer diameter and inner diameter, and the circular, inner diameter and six punching grooves of the fiber disk were pressed. A pulp fiber, which is a substrate of the fiber disk, was prepared by applying a pressure of 1 ton at.

The phenol resin adhesive and calcium carbonate were mixed at a mixing ratio of 50:30 to form a primary adhesive, and the viscosity of the adhesive was measured based on whether or not the coating amount by the cup inspection at 25 ° C corresponds to the reference value. The primary adhesive passed in the measurement was applied to the upper part of the pulp fiber by a roll coater and roll coated. After coating the primary adhesive, the coating amount test and the actual weight test were performed.

A composite abrasive having a predetermined particle size and component was applied and measured on top of the pulp fiber to which the primary adhesive was applied.

The phenol resin adhesive and calcium carbonate as a filler were mixed at a mixing ratio of 50:40 to form a secondary adhesive, the viscosity was measured, and the secondary adhesive was applied onto the pulp fiber to which the abrasive was applied.

The fiber disk semifinished product manufactured by the above manufacturing process was plate-dried at the oven temperature of 60-120 degreeC for 6 to 10 hours in the drying room.

The dried fiber disks were aligned and pressed to the flanges and pressed to make the fiber disks flat by a hydraulic compressor. The fiber disk fitted in the flange was placed in a curing chamber and cured at a temperature of 80 to 130 ° C. for 15 to 18 hours.

The shape was corrected by humidifying the hardened fiber disk and pressing it with a hydraulic compressor. The back side of the calibrated fiber disk was back coated with urethane resin and hardener by roll coating, and then placed on a plate and dried for more than 4 hours.

The back coated fiber disk was heat-treated at 100 ~ 200 ℃ in a conveyor drying furnace, and then molded to a predetermined standard for 5 ~ 60 seconds by hydraulic press (13 kgf / ㎠) using 16mm and 22mm molds. After cooling, a fiber disk was produced.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

As described above, the present invention uses a single pulp fiber as a base material to improve safety even at high rotational speeds, thus enabling safe operation, and to using a single fiber disk without overlapping two existing fiber disks. It can be used, can achieve high efficiency of safety, improve the grinding property, and form the back coating layer on the lower part of the disk, which can improve the warpage of the disk, and it uses pulp, an eco-friendly material that is harmless to human body. The effect does not cause environmental problems.

Since the disk is shaped into a bound, one-bound, and planar shape, there is an effect that can be usefully used for various polishing sites and polishing conditions.

Since the pulp fiber of a single material is used, the manufacturing process is simplified and the manufacturing time and manufacturing cost can be reduced.

Claims (8)

In the fiber disk, A circular disk-shaped pulp fiber 11 having a coupling hole formed at the center thereof; A first adhesive layer 12 formed by applying a first adhesive on the pulp fiber 11; An abrasive 13 coated on top of the first adhesive layer 12; A second adhesive layer 14 formed by applying a second adhesive on top of the first adhesive layer 12 to which the abrasive 13 is applied; Fiber disk, characterized in that consisting of a back coating layer 15 coated on the lower portion of the pulp fiber (11). The method of claim 1, The fiber disk, characterized in that the thickness of the pulp fiber (11) is 1.6 to 2.5mm. The method of claim 1, The back coating layer (15) is a fiber disk, characterized in that the urethane resin and the curing agent are mixed in a roll ratio of 40:10 to 60:10 mixed. The method according to any one of claims 1 to 3, The shape of the fiber disk is a fiber disk, characterized in that formed into a bound disk (100), one-bound disk (200) or a planar disk (300). The method of claim 4, wherein The bound disk 100 has a coupling portion 120 formed on the outer circumference of the coupling hole 110 in the center, a bending portion 130 extending on the outer circumference of the coupling portion 120, and the bending portion 130. Consisting of the polished portion formed to extend to the outer circumference of 140, The bent part 130 is bent at an inclination angle α of 15 to 45 ° with respect to the coupling part 120, and the polishing part 140 is at an inclination angle β of 5 to 8 ° with respect to the coupling part 120. A fiber disk, which is bent. The method of claim 4, wherein The one-bound disk 200 is a fiber disk, characterized in that the curvature radius (RA) in the vertical direction is curved to 550 to 600R, the curvature radius (RB) in the horizontal direction is curved to 450 to 550R. In the manufacturing method of the fiber disk, Punching the pulp fiber 11 into a disk shape (S11); Forming a first adhesive layer (12) by applying a first adhesive on the punched disc-shaped pulp fiber (11) (S13); Applying an abrasive (13) on top of the first adhesive layer (12) (S14); Forming a second adhesive layer 14 by applying a second adhesive on the first adhesive layer 12 to which the abrasive 13 is applied (S15); Drying, curing and correcting the pulp fiber (11) having the polishing layer formed thereon, and coating the lower portion of the pulp fiber (11) to form a back coating layer (15); And a step (S20) of forming the back-coated pulp fiber (11). The method of claim 7, wherein In the step (S20) of forming the pulp fiber 11, the pulp fiber 11 is heat-treated at a temperature of 100 ~ 200 ℃ in a drying furnace, and the shape of the fiber disk, characterized in that for 5 to 60 seconds by pressing Manufacturing method.

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