JP5534604B2 - Abrasive belt manufacturing method and abrasive belt - Google Patents

Description

  The present invention relates to a non-woven fabric abrasive belt obtained by laminating a non-woven fabric on the surface of a belt base material having an endless loop shape, and a method for producing the same.

An abrasive belt has been developed in which a non-woven fabric with abrasive particles attached is laminated on the surface of a loop belt base material (see Patent Document 1).
In this polishing belt, a nonwoven fabric is laminated as a polishing layer on a belt base material of a seamless endless belt. This abrasive belt is manufactured by laminating a nonwoven fabric on a belt base material processed into a loop shape.

JP 2004-98218 A

  The polishing belt of Patent Document 1 can increase polishing power by attaching abrasive grains to a nonwoven fabric. The abrasive grains are bonded to the surface of the fibers constituting the nonwoven fabric via an adhesive. This abrasive belt is manufactured by laminating a non-woven fabric on the surface of a belt base material processed into an endless loop. Compared to a method of laminating a non-woven fabric on a sheet-like belt base material as a horizontal plane. There is a disadvantage that the production efficiency deteriorates. This is because the nonwoven fabric cannot be laminated by arranging a loop-like polishing belt on a horizontal plane.

The methods shown in FIGS. 1 to 4 are employed in order to efficiently mass-produce abrasive belts while avoiding the above-described problems. This manufacturing method manufactures an abrasive belt in the following steps.
(1) The process of laminating a nonwoven fabric on a belt base material In this process, as shown in FIG. 1, a sheet-like belt base material 91 is placed on a horizontal plane, and the fibers 92 that form the nonwoven fabric 93 thereon are oriented. After the assembly, the needle 92 is punched through the belt base material 91 to bond the fibers 92 to the belt base material 91.
(2) A process of attaching abrasive grains to the nonwoven fabric In this process, as shown in FIG. 2, an adhesive 97 is applied to attach the abrasive grains 98 to the fiber surface of the nonwoven fabric 93. In this step, the adhesive 97 mixed with the abrasive grains 98 is sprayed on the nonwoven fabric 93, and the abrasive grains 98 are adhered to the surface of the fibers 92, or the adhesive of the belt base material is bonded to the adhesive mixed with the abrasive grains. The nonwoven fabric is immersed and impregnated, and pressed to remove excess adhesive, and the abrasive grains are attached to the fiber surface.
(3) Step of making the belt base material in a loop shape In this step, as shown in FIG. 3, the adhesive 97 is applied to both ends of the belt base material 91 and laminated with a predetermined width to form a loop shape. The part 94 is sandwiched between the two metal plates 90 to cure the adhesive 97.

  In the polishing belt manufactured by the above process, the structure of the connecting portion connected in a loop shape is as shown in the sectional view of FIG. That is, at the joint 99, the nonwoven fabric 93 and the belt base material 91 are stacked and thinly crushed. Therefore, the abrasive belt manufactured by the above method has a seam 99 that is hard and crushed with a width of about 1 cm, for example. The seam 99 is considerably harder than the other parts and loses its flexibility, and when used as an abrasive belt, it has a drawback that it cannot be smoothly transformed into a small radius of curvature. This is because the adhesive 97 is applied to the laminated portion 94 of the belt base material 91 and is sandwiched and cured in a plate shape. Therefore, when this abrasive belt is used over a pulley having a small belt sander, there is a drawback that it cannot be smoothly curved with a small radius of curvature along the pulley.

  Further, the above polishing belt is specified in the direction (indicated by the solid arrow A in FIG. 4) for polishing the object to be polished, and cannot be used in the opposite direction. This is because, when moved in the opposite direction (indicated by a broken arrow B in FIG. 4), the joint 99 is easily peeled off as indicated by the chain line in FIG. For this reason, the polishing belt of this structure is marked with a mark indicating the moving direction. However, the polishing belt that is needle punched and bonded to the belt base material is a state where the fiber protrudes on both sides of the belt base material and the nonwoven fabric is laminated on both sides. In addition, there is a drawback that this mark is easily removed by using an abrasive belt and cannot be recognized. If the mark becomes unclear when used, the user will use it oppositely and the life will be extremely short.

  Furthermore, since the above-mentioned abrasive belt bonds the laminated portion with an adhesive, it is necessary to hold the laminated portion between two metal plates until the adhesive is cured, which takes time to manufacture. There is also.

  In order to efficiently produce an abrasive belt in large quantities, as shown in FIG. 5, a method of adhering an adhesive tape 80 along the lower surface of the joint 99 has also been developed, and an abrasive belt manufactured by this method is commercially available. . However, since this abrasive belt uses a special adhesive tape, the manufacturing cost is high, and it is difficult to make the seam sufficiently strong, and the life is shortened by cutting at the seam.

The present invention has been developed for the purpose of solving the above drawbacks. An important object of the present invention is a method and a method for producing a polishing belt that is simple, efficient, and inexpensively mass-produced, has a strong structure at the seam, and is flexible at the seam and can be bent with a small radius of curvature. To provide a belt.
In addition, another important object of the present invention is to provide a polishing belt manufacturing method and a polishing belt that can be used conveniently by the user without specifying the direction of use, and that can also prevent the seam from peeling and extend the life. It is to provide.

Means for Solving the Problems and Effects of the Invention

  The method for producing an abrasive belt of the present invention includes a lamination step in which fibers 2 are laminated on a surface of a belt substrate 1 without directionality, and the laminated fibers 2 are bonded to the belt substrate 1 to form a nonwoven belt 3. The both ends of the belt base material 1 constituting the belt 3 are laminated, the sewing step of sewing the laminated portion 4 and connecting them in a loop shape, and attaching the adhesive 7 to the belt base material 1 and the nonwoven fabric. And a bonding step of adhering the abrasive grains 8 to the surface of the fibers 2 constituting the nonwoven fabric via the adhesive 7.

  The above manufacturing method of the polishing belt is simple and efficient, and can produce a large number of polishing belts at low cost, but the seam of the polishing belt can be made tough structure, and the seam is flexible and has a small curvature. There is a feature that can be curved with a radius. In addition, the abrasive belt manufactured by the above method has a feature that the direction of use is not specified, and the user can use it conveniently to prevent the seam from peeling and prolong the life.

  In the manufacturing method of the polishing belt of the present invention, the non-woven belt 3 connected in a loop shape in the sewing process is cut into a predetermined width, or after the bonding process, the non-woven belt 3 to which the abrasive grains 8 are attached is predetermined. Can be cut to the width of

  In the method for producing an abrasive belt of the present invention, the laminated belt base material 1 or nonwoven fabric belt 3 can be sewn in a zigzag shape in the sewing step.

  The polishing belt of the present invention is a non-woven belt 3 in which a non-woven fabric formed by three-dimensionally gathering fibers 2 bonded with abrasive grains and bonding the intersections of the fibers 2 is laminated on the surface of the belt substrate 1. The two ends are connected to form a loop. The nonwoven fabric belt 3 is constructed by laminating both ends of the belt base material 1 at both ends thereof and sewing and connecting the laminated portions 4. The laminated sewing portions 6 are bonded to the fiber surface of the nonwoven fabric with abrasive grains 8. It is adhered with an adhesive 7 formed by adhering.

  The above-described polishing belt is characterized in that it can be produced easily and efficiently, and can be mass-produced at a low cost, but can have a strong structure at the seam, and can be bent with a small radius of curvature at the seam. In addition, the above-described abrasive belt can be used conveniently by the user without specifying the direction of use, and can realize a feature that can prevent the seam from peeling and prolong the service life.

It is a partially expanded sectional view which shows the manufacturing process of the conventional grinding | polishing belt. It is a partially expanded sectional view which shows the manufacturing process of the conventional grinding | polishing belt. It is a partially expanded sectional view which shows the manufacturing process of the conventional grinding | polishing belt. It is sectional drawing of the conventional grinding | polishing belt manufactured with the manufacturing method shown in FIG. It is sectional drawing which shows the other conventional grinding | polishing belt. It is a partially expanded sectional view which shows the lamination process of the manufacturing method of the abrasive belt concerning one Example of this invention. It is sectional drawing which shows the sewing process of the manufacturing method of the abrasive belt concerning one Example of this invention. It is a top view which shows the sewing process of the manufacturing method of the abrasive belt concerning one Example of this invention. It is a top view which shows the sewing process of the manufacturing method of the abrasive belt concerning the other Example of this invention. It is a partially expanded sectional view which shows the adhesion process of the manufacturing method of the abrasive belt concerning one Example of this invention. It is a perspective view which shows the process of cutting the nonwoven fabric belt connected by the loop shape at the sewing process. It is an enlarged photograph which shows the joint of the polishing belt manufactured with the manufacturing method of this invention. It is an enlarged photograph which shows the joint of the polishing belt manufactured by the conventional method.

  Embodiments of the present invention will be described below with reference to the drawings. However, the examples shown below exemplify the polishing belt and the manufacturing method thereof for embodying the technical idea of the present invention, and the present invention uses the polishing belt and the manufacturing method as follows. Is not specified. Further, in this specification, in order to facilitate understanding of the claims, numbers corresponding to the members shown in the examples are shown in the “claims” and “means for solving the problems” columns. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  6 to 10 show a state in which the polishing belt is manufactured by the laminating process, the sewing process, and the bonding process.

[Lamination process]
In this step, as shown in FIG. 6, the fibers 2 are laminated on the surface of the belt base material 1 without directivity, and the laminated fibers 2 are bonded to the belt base material 1 to form a nonwoven fabric belt 3.
The belt base material 1 becomes a core material of a flexible polishing belt and realizes sufficient tensile strength. The belt base material 1 is optimally a flexible mesh material in which synthetic fibers are braided into a coarse mesh so that a nonwoven fabric laminated on the surface without orientation can be firmly bonded. However, another flexible sheet material that can be bonded to the laminated nonwoven fabric and has sufficient tensile strength as an abrasive belt can be used for this belt base material.

  The fibers 2 laminated on the belt substrate 1 are bonded to the belt substrate 1 by needle punching. In the needle punch, the fiber 2 is hooked and penetrated through the belt substrate 1 to be bonded to the belt substrate 1. The non-woven belt 3 in which the fibers 2 are bonded to the belt substrate 1 with a needle punch can be bonded to the belt substrate 1 without using an adhesive or with a small amount of adhesive, so that it is flexible enough for an abrasive belt. Can be realized. However, the fibers laminated on the surface of the belt base material do not necessarily need to be bonded to the belt base material with a needle punch, and may be bonded to the surface of the belt base material using, for example, an adhesive.

[Sewing process]
In this step, as shown in FIGS. 7 and 8, both end portions of the belt base material 1 constituting the nonwoven fabric belt 3 are laminated, and the laminated portion 4 is sewn and connected in a loop shape. In this step, preferably, both end portions of the nonwoven fabric belt 3 in which the fibers 2 are laminated on the belt substrate 1 are laminated and the laminated portion 4 is sewn. That is, both the belt base material 1 and the nonwoven fabric fiber are laminated and sewn. However, a part or the whole of the nonwoven fabric fiber on the surface is removed at both end portions of the belt base material, and both end portions of the belt base material from which the nonwoven fabric fiber has been removed are laminated, and the laminated portion can be sewn. The width (d) in the longitudinal direction of the stacked portion 4 is, for example, 3 mm to 10 mm. By increasing the lamination width (d), the connection strength of the seam 9 can be improved. However, in order to make the flexibility of the entire polishing belt uniform, it is necessary to reduce the lamination width (d). Therefore, the lamination width (d) is set to an optimum value within the above-mentioned range in consideration of the connection strength and flexibility of the joint 9.

  The stacked portion 4 is sewn in a zigzag shape as shown in FIG. The zigzag stitches 5 are sewn to the laminated portion 4 so as to have a lateral width (W) that protrudes outward from both end edges of the laminated portion 4 or the same width as the laminated width (d) of the laminated portion 4. The laminated portion 4 sewn in this structure is sewn more securely with both edges fixed to each other with the sewing thread 10. However, the laminated portion can be sewn so that the seam extends in the lateral direction. As shown in FIG. 9, the seam for sewing the laminated portion in this state can be provided by stitching the laminated portion 4 by providing the seam 5 along both side edges of the laminated portion 4. In FIG. 9, the laminated portion 4 is attached with three rows of stitches 5, but the laminated portion can be attached with one or two rows of stitches, or with four or more rows of stitches.

[Adhesion process]
In this step, as shown in FIG. 10, the nonwoven fabric fibers 2 on the surface of the belt base material 1 are bonded at the intersections via the adhesive 7, and the abrasive grains 8 are attached to the surface of the fibers 2. The laminated sewing parts 6 that have been sewn are bonded and more securely connected. In this step, the abrasive particles 8 are mixed and sprayed into an uncured paste-like or liquid adhesive 7, the adhesive 7 is cured, the nonwoven fabric fibers 2 are bonded at intersections, and the abrasive particles 8 are bonded to the fiber surface. Then, the laminated sewing portion 6 is adhered. However, in this process, after spraying an adhesive that does not mix abrasive grains, the abrasive grains can also be sprayed in an uncured state of the adhesive. Also, without spraying the adhesive, immerse it in an adhesive that mixes abrasive grains, squeeze this to squeeze out the excess adhesive, bind the nonwoven fibers, and attach the abrasive grains to the fiber surface And a laminated sewing part can also be adhere | attached. Furthermore, after being immersed in an adhesive agent, the abrasive grains can be sprayed and adhered in an uncured state of the adhesive agent.

  The polishing belt is manufactured by the above process. In order to obtain a predetermined width, the non-woven belt 3 connected in a loop shape in the sewing process is cut into a predetermined width as shown in FIG. Can do. In this manufacturing method, an adhesive 7 in which abrasive grains 8 are mixed is sprayed on the cut nonwoven fabric belt 3 to bond the nonwoven fibers 2 and attach the abrasive grains 8 to the fiber surface. The part 6 is bonded to obtain a polishing belt having a predetermined width.

  Moreover, the manufacturing method of this invention can also cut | judge the loop-shaped nonwoven fabric belt with which the abrasive grain adhered to the predetermined width after an adhesion | attachment process, and can also be set as the abrasive belt of a specific width.

An abrasive belt is manufactured in the following steps.
[Lamination process]
5 to 100 denier fibers, preferably 10 to 40 denier fibers 2 are gathered without direction on the surface of the belt substrate 1 in which plastic fibers are braided into a net shape, and needle punched to assemble the fibers 2 into the belt substrate 1. To make a non-woven belt 3.
[Sewing process]
Both ends of the nonwoven fabric belt 3 are laminated with a width of 5 mm. The nonwoven fabric belt 3 laminates the belt base material 1 and the fibers 2 laminated on the surface thereof. The laminated portion 4 is sewn in a zigzag shape. The seam 5 to be sewn is fixed with the seam 5 to both side edges of the laminated portion 4 with a zigzag width of 5 mm.
[Adhesion process]
The urethane adhesive 7 mixed with the abrasive grains 8 is sprayed in the state of an uncured paste, the fibers 2 are bonded at the intersections with the adhesive 8, and the abrasive grains 8 are attached to the surface of the fibers 2. Further, the laminated portion 4 is bonded with the adhesive 7.

  FIG. 12 shows an enlarged photograph of the laminated sewing portion 6 of the abrasive belt manufactured by the above process. As shown in the reference photograph in this figure, the polishing belt manufactured by the above process can be firmly connected while making the seam almost indistinguishable from other parts. In particular, the entire seam can be made uniform and flexible without being cured with an adhesive. FIG. 13 is an enlarged photograph showing a seam of an abrasive belt manufactured by a conventional method. In the polishing belt of this figure, the seam is thinly crushed and hardened with an adhesive, and the strength of the seam is weakened. Abrasive belts cut from the seam cannot be used, and the service life is shortened.

DESCRIPTION OF SYMBOLS 1 ... Belt base material 2 ... Fiber 3 ... Non-woven belt 4 ... Laminated part 5 ... Seam 6 ... Laminated seam part 7 ... Adhesive 8 ... Abrasive grain 9 ... Seam 10 ... Sewing thread 80 ... Adhesive tape 90 ... Metal plate 91 ... Belt Base material 92 ... Fiber 93 ... Non-woven fabric 94 ... Laminate part 97 ... Adhesive 98 ... Abrasive grain 99 ... Seam

Claims (4)

Laminating step of laminating fibers (2) non-directionally on the surface of the belt substrate (1), and bonding the laminated fibers (2) to the belt substrate (1) to form a nonwoven belt (3);
A sewing step of laminating both ends of the belt base material (1) constituting the nonwoven belt (3), sewing the laminated portion (4) and connecting them in a loop;
Adhesive (7) is adhered to the belt substrate (1) and the nonwoven fabric to bond the laminated sewing part (6), and the surface of the fiber (2) constituting the nonwoven fabric is polished via the adhesive (7). A method for producing an abrasive belt comprising an adhesion step for adhering grains (8).   The non-woven belt (3) connected in a loop shape in the sewing step is cut to a predetermined width, or after the bonding step, the non-woven belt (3) to which abrasive grains (8) are attached is set to a predetermined width. The method for producing an abrasive belt according to claim 1, wherein the abrasive belt is cut into pieces.   The method for manufacturing an abrasive belt according to claim 1 or 2, wherein in the sewing step, the laminated belt base material (1) or the nonwoven fabric belt (3) is sewn in a zigzag shape. A non-woven belt (3) in which non-directional non-directionally assembled fibers (2) formed by bonding abrasive grains are laminated on the surface of the belt substrate (1) by bonding the intersections of the fibers (2). ) Is a polishing belt in which both ends are connected to form a loop,
The non-woven fabric belt (3) has both ends of the belt base material (1) laminated at both ends, and the laminated portion (4) is sewn and connected, and this laminated sewing portion (6) A polishing belt comprising an adhesive (7) formed by adhering abrasive grains (8) to a fiber surface of a nonwoven fabric.