JPH09201232A - Polishing brush and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption of an adhesive and to shorten the process time by consisting the curing adhesive of a curable soln. contg. a curable solid resin, hardener and volatile solvent and using polishing sheets which are impregnated with the adhesive soln. from at least either of both surfaces thereof and are subjected to volatilization of the solvent as the respective polishing sheets for forming the brush. SOLUTION: The curing adhesive for the polishing brush is formed of the curable soln. contg. the curable solid resin, the hardener and the volatile solvent. The respective polishing sheets for forming the brush are impregnated with the adhesive ejected from a spray coating device to at least one surface of the sheets. The sheets are thereafter dried by a drying device. Disk sheets 25 are blanked from such polishing sheet band 20 and are passed onto a dummy shaft 8 by directing the surfaces on the side opposite to the surfaces coated with the adhesive toward a substrate 6. The upper disk sheets are superposed on their lower disk sheets by bringing the sheets into contact with the coating side of the lower disk sheets. The laminate is compressed by a pressing plate 7 and a thread cutting rod and the dummy shaft 8 is removed. The dried adhesive is then cured in a heating furnace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abrasive tool, and more specifically, to an abrasive brush of a laminate type, a spiral type or a wheel type, a flap type and the like used in the tool, that is, incorporated into the tool, and the brush. To a method of manufacturing. The polishing operation using this polishing tool includes grinding, polishing, polishing, buffing, and other similar operations.

[0002]

BACKGROUND OF THE INVENTION One of the typical abrasive tools includes a laminating type abrasive brush, a holder containing a pair of disk plates with a central hole, and a spindle mounted when used for tool rotation. Composed of. This polishing brush has a center hole for inserting a spindle and is a stack of a plurality of polishing disk sheets having a compressible mesh structure, which are aligned at least when assembled into a brush tool. It is a laminated body (laminate) having such a structure in a state of stacking, that is, stacked and compressed. Generally, an abrasive disc sheet is a compressible flexible base material sheet such as a non-woven fabric having a mesh structure, and a base material having such a structure that carries abrasive grains attached to the base material sheet by a resin binder. It is an individual piece punched from a sheet.

There are two approaches to maintaining the disc sheet laminate in compression on the brush holder. Japanese Patent Application No. 6-16121 of the present applicant, which is so-called "direct method"
According to one approach described in No. 3, each of the pair of disc plates has at least one axial spacer in the form of a pole with snap-on means, preferably a spindle is inserted. It has a central hollow pole as this spacer. The disc plate has holes for the poles, and the stack of disc sheets stacked in alignment is compressed with a pole extending axially in the stack between the pair of disc plates. And is held in a compressed state in the holder by the snap engagement of the snap locking means.

In the preferred embodiment, each disk plate comprises, in addition to the central spacer pole, a plurality of poles having similar snap-engaging means circumferentially spaced. Since the poles extend axially to the disc brushes for connecting the pair of disc plates, these poles prevent the brushes from grinding the workpiece while the disc brush and holder rotate with the spindle. do not do. This approach does not involve adhesives for the brush tool to compact and solidify (ie, compact) the laminate, so the brush tool is low cost and simple without polluting the environment and workers involved. It can be said that it is useful in that it can be manufactured in the same manner. However, as shown in FIG. 1, in the peripheral area of the stack where the compressed stack (5) of the disc sheets in the holder does not have a pole extending to connect the pair of disc plates (3, 4). There is an inherent problem that the flower shape (F) tends to bulge. Such a puffed brush tends to grind inefficiently and inaccurately on the workpiece as it rotates with the holder by the spindle (5).

On the other hand, according to another approach, which is so-called "dobu-zuke method" or "dipping method", a stack of disc sheets stacked in alignment corresponding to the above-mentioned approach is placed. A temporary jig as shown in FIG. 2 comprising a pair of disc plates having central holes formed therein and means for connecting the pair of disc plates in a state where the laminated body is compressed between the pair of disc plates. Is prepared. The laminated body is impregnated with a predetermined amount of the adhesive by dripping the structure of the temporary jig and the compressed laminated body retained therein into the bath liquid of the resin-based adhesive composition, that is, by immersing it, and then Heating, i.e. heat treatment, cures the impregnated adhesive, thereby compressing and solidifying the compression laminate with the cured adhesive. Thereafter, the compression-solidified laminate, that is, the compact laminate, is taken out from the temporary jig by disassembling it as a polishing brush product to be constructed by assembling the polishing disk tool together with the holder and the spindle.

The second approach described above is beneficial in that the phenomenon of flower opening, or bulge, does not occur in the area around the brush during the polishing operation. However, the process of compressing and solidifying a stack of coherently stacked disc sheets is time consuming and is particularly cumbersome to handle, i.e., because all steps are performed under wet conditions. . Furthermore, the soaking step of doughing, the heating step, and the transfer step of transferring the structure in which the temporary jig and the laminated body are immersed from the immersion step to the heating step are liable to drop the adhesive from the structure and drop. As a result, the adhesive applied to the structure may contaminate the surrounding environment and workers. Furthermore, since the adhesive is applied to the compressed stack of co-registered disc sheets, the stack is not efficiently impregnated with the adhesive, resulting in a slow dipping process. This results in a non-negligible amount of non-recoverable consumable adhesive. Furthermore, it is not possible in practice that the laminate in the construction will be evenly impregnated with the adhesive as a whole, but if at all, the density of the impregnated cured adhesive in the laminate Are not evenly distributed over the cross section for the following reasons. That is, the heating process in the heating furnace,
That is, during the heat treatment, the impregnated adhesive is allowed to flow by its own weight before hardening. As a result, the abrading capacity of disk brushes tends to vary around the brush and / or along the axial width of the brush and is therefore less stable.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to have an adhesive which has been impregnated and cured with a density which is substantially uniform over the entire cross section and over the entire width resulting in a brush substrate. It is an object of the present invention to provide an improved abrasive disc brush of compression solidified material having a uniform density. Another object of the present invention is to use an adhesive as a method of manufacturing the improved brush, which does not pollute the related environment and workers.
Moreover, it is an object of the present invention to provide such an improved abrasive brush manufacturing method which uses only a reduced amount of adhesive as compared to the prior art. Yet another object of the present invention is a method of making an abrasive brush comprising the steps of impregnating an abrasive brush material with an adhesive and subsequent various steps of making a brush product using the resulting adhesive impregnated brush material. Accordingly, it is an object of the present invention to provide such an abrasive brush manufacturing method improved so that the subsequent steps can be carried out by extremely easy handling of the adhesive-impregnated brush material and a semi-finished product made therefrom. is there.

[0008]

According to one aspect of the present invention,
Spiral type, laminating type, flap type, etc. abrasive brush, single or multiple abrasive sheets with a compressible mesh structure, arranged according to the type of brush and then compressed and solidified with an adhesive that hardens. In an abrasive brush used in an abrasive tool comprising such an abrasive sheet, the curing adhesive is originated from a curable solution containing a curable solid resin, a curing agent and a volatile solvent. And each abrasive sheet before the sheet arrangement for the brush type is impregnated with the adhesive solution supplied from at least one of its two sides and the solvent is volatilized by subsequent drying. An abrasive brush is provided. More specifically, the laminating type polishing brush is a plurality of disc-shaped polishing sheets having a compressible mesh structure, and each polishing disc sheet has a curable solid resin pre-applied to at least one side surface. , Which is impregnated with a solution of a resin-based adhesive containing a curing agent and a volatile solvent,
All abrasive disc sheets have at least one of the adjacent abrasive disc sheets in the uncured and dried state of the adhesive.
A polishing sheet of such a structure, which is stacked in alignment and then compressed and solidified in such a manner that one has one side facing the other as the adhesive application surface. An abrasive brush for use in an abrasive disc tool is provided by the present invention.

One of the important principle features of the present invention is that a curable solid resin is used as the main component of the adhesive and the adhesive is once dried before curing. As the curable solid resin, a solid epoxy resin, a solid urea resin, a solid urethane resin, a solid phenol resin, or the like can be used, but the solid epoxy resin is particularly preferable. As the adhesive, a composition containing a solid epoxy resin having a softening point of 60 ° C. or higher, a curing agent and a solvent, which is disclosed in Japanese Patent Application No. 7-20813 of the present applicant, is preferable. The solid epoxy resin includes cresol novolac type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, naphthalene type epoxy resin, fluorene epoxy resin and glycidyl amine compound. It can be at least one selected from the group consisting of: The curing agent is preferably one or more selected from the group consisting of dicyandiamide, acid hydrazide, borane trifluoride complex, imidazole compound, amine imide and lead salt. One of the curing agents of choice is dicyandiamine (DICY). Each abrasive disc sheet is composed of a flexible material sheet, which is a nonwoven fabric, a woven cloth, or a sponge sheet, having a compressible mesh structure, and abrasive grains bonded to the material sheet.

According to another aspect of the present invention, a continuous strip of abrasive sheet having a compressible mesh structure carrying abrasive grains with a binder is prepared; A liquid adhesive composition containing a solid epoxy resin, a curing agent and a volatile solution is applied to one side, and the coated abrasive sheet strip is dried at a predetermined temperature for volatilization of the solvent; In the case of making, by punching the dry sheet strip to form a group of pieces of a polishing sheet having a predetermined disk outer shape having a central hole; for stacking and compressing the obtained polishing disk sheets in an aligned manner By applying the temporary jig assembled to the above, the temporary jig and at least one of the adjacent polishing disk sheets have one side facing the other as the adhesive application surface. A laminate comprising a predetermined number of the abrasive disc sheets stacked and aligned in an aligned manner; for curing the dry adhesive composition in the laminate. A polishing brush comprising the above-mentioned steps of heating at a predetermined temperature higher than that of the drying step; and removing the resulting laminated body as an integral polishing brush from the temporary jig by disassembling it. A manufacturing method is provided. When the adhesive is applied to only one of the both side surfaces of the polishing sheet strip, it is preferable to apply the adhesive with the side surface of the one side facing upward. The adhesive application step is preferably carried out by a spatula coating method, more preferably by a spray coating method. The brush manufacturing process up to the above-mentioned stacking compression process is commonly and advantageously applied to both spiral type and flat type brush manufacturing.

For the abrasive sheet strip carrying the abrasive grains fixed to the above material sheet, a continuous strip of a flexible substrate sheet is prepared; the abrasive grains and epoxy resins are added to the substrate sheet strip. Can be prepared by conventional methods of impregnating a slurry of an abrasive composition containing a curable binder and a volatile solvent; heating the coated strip to cure the abrasive composition.

In a preferred example, a continuous strip of a raw material sheet is prepared in a roll form and rewound so as to continuously run along a work route, and in this work route, an abrasive composition impregnation step to an adhesive composition is performed. Allow the drying process to take place and then roll up. The resulting roll is then rewound so that the sheet strip runs intermittently along another work path in which the punching process is performed. The roll around which the abrasive sheet band is wound can be effectively used for producing a flap type brush or a spiral type brush.

[0013]

In the production of the laminated type brush according to the present invention, applying the liquid adhesive composition to the polishing sheet strip on one side of each side means liquid bonding to one side of the polishing sheet strip. It means that the adhesive composition is applied, and therefore, if the adhesive is applied with the one side surface positioned as the upper surface, the adhesive is a sheet due to its gravity and fluidity. It is easily penetrated into the interior of the strip, resulting in an adhesive impregnated sheet strip. This is possible because the compressible sheet strip has a mesh structure and is not compressed at all during the coating process. In the conventional dipping method, the impregnation requires a significantly long working time, whereas the adhesive impregnation step of the present invention does not substantially take time.

(1) The abrasive sheet strip is a brush material to be impregnated with an adhesive, which is compared to the axial width of the brush product formed by the matched stack and the compressed and solidified disk sheet. Remarkably thin; (2) punched from a group of disc sheets impregnated with adhesive distributed over the entire surface, that is, sheet strips impregnated with adhesive distributed over the entire surface. The processed disc-shaped individual pieces are aligned and stacked, and then cured to form a disc brush. The above configurations (1) and (2) together cause the density of the cured adhesive in the brush to be evenly distributed not only over the entire width but also over the entire cross section. The density becomes uniform.

The above-mentioned constitution (2) is commercially available by applying an uncured dryable adhesive, that is, by applying the above-mentioned adhesive composition containing a solid epoxy resin, without any troublesome handling. Can be carried out. The "curable solid resin" including the solid epoxy resin as referred to herein is such a resin that is soluble in a volatile solvent but remains solid at room temperature around 25 ° C without curing unless dissolved. . This means that the dried adhesive forms a solid phase of the resin in which the curing agent is dispersed and is therefore non-sticky and non-flowing. Further, as long as this type of resin is solid, it does not impair the compressibility and flexibility of the base sheet strip (the above-mentioned abrasive grain bonding binder may preferably be an epoxy resin, but this type of solid It does not have to be an epoxy resin). Therefore, a sheet strip carrying such a dry adhesive facilitates the handling of manual and mechanical operations for punching the sheet strip into a disc sheet, and makes the resulting disc sheet work with the environment. It enables easy manual or mechanical stacking in conjunction with the temporary jig without contamination of the person.

Further, according to the sheet strip carrying the dry adhesive according to the present invention, as described above, contrary to the conventional method, the flexibility is maintained in the dry state, not the wet state, and the adhesion is achieved. Since it has no property, it can be stored at room temperature and can be easily transported to any place. It is easy to rewind this roll for the punching process without damaging the sheet band. It is acceptable depending on the conditions to be obtained.

With respect to the solid epoxy resin employed in accordance with the present invention, a softening point above 60 ° C. is of practical importance for maintaining the adhesive density substantially evenly distributed during the process of adhesive cure. It is something. When the softening point is lower than 60 ° C, the temperature of the solid epoxy resin rises to reach a desired curing temperature such as 160 ° C, that is, the initial stage of the curing process, that is, prematurely. Most of the solid epoxy resin is aligned and stacked in combination with a temporary jig, and is softened to such an extent that it is fluidized downward by gravity inside the laminated body of the compressed disk sheet group. The softening point is preferably in the range of 60 ° C to 300 ° C, more preferably in the range of 60 ° C to 160 ° C.

Although double coated sheet strips may be employed in accordance with the present invention, generally single coated sheet strips have a cured adhesive density that is substantially evenly distributed over the entire width and cross section of the brush. Is sufficient to provide an abrasive disc brush that is The reason is that a single-sided coated disk sheet group formed by punching from a single-sided coated sheet strip is such that one of the adjacent disk sheets is coated with the adhesive applied on the side facing the other non-coated side under the following proviso. This is because the products are aligned and piled up and then compressed. However, regarding at least one set of the disc sheets each of which is adjacent to each other, the adjacent disc sheets have coating side surfaces facing each other.
The exception to this configuration is that the coated sheets of the aligned stacked disc sheets forming the laminated body are sandwiched between the leading and trailing disc sheets arranged as the trailing sheets. It is intended to prevent the occurrence of such a situation in which the temporary jig element comes into contact with the substrate and the push plate, and thus the situation in which the substrate and the push plate are firmly adhered. In the case of strong adhesion, disassembling the temporary jig to remove the product of the disk brush from the jig causes damage to the disk brush.

The compression of the above-mentioned disc sheets causes the side opposite to the coating side to be displaced towards the coating side, thus significantly reducing the thickness of the disc sheet and thus the overall volume. As a result, the density of dry adhesive throughout the disk sheet will increase dramatically, even though the amount of dry adhesive does not change between uncompressed and compressed conditions. Thus, the increased density of the adhesive is such that when the adhesive cures, adjacent compressed disc sheets are bonded together and each compressed disc sheet is secured to its full thickness. It ensures that the stack compacts, i.e. becomes compact.

Further, thanks to the increase of the adhesive density, the total amount of the adhesive consumed for making one good disc brush is the consumable part (waste part) resulting from the punching of the sheet strip. Although the adhesive consumption portion which has already been applied is wasted, it is significantly reduced as compared with the adhesive consumption amount due to the conventional brush according to the dipping method. It should be noted that the above-described effects can be similarly exhibited in the flap type or wheel (spiral) type polishing brush based on the principle of the present invention.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 3 and 4 show a method of manufacturing the laminating type polishing brush shown in FIG. 5 used in an example of the polishing tool according to the present invention. In FIG. 3, a starting material roll 100 of a base material sheet 10 in the form of a continuous strip having upper and lower surfaces is unwound by a rewinding machine (not shown) having a horizontally extending rotating shaft. The body 10 is continuously run along the work route, and various treatments necessary for transforming the base sheet strip 10 into the polishing sheet strip 20 are performed in this route. The polishing sheet strip 20 is continuously wound up by a hoisting machine (not shown) having a horizontally extending rotating shaft to form an intermediate material roll 200.

The base sheet strip 10 is flexible with a compressible mesh structure, and thus it can be non-woven, woven or sponge. Fabrics are preferably made of 10-30 denier polyester or polyamide fibers and have a thickness of 10-50 mm.
Thickness and width of 100-1000 mm.

Along with the working route, an abrasive composition impregnating device, a heating furnace, an adhesive composition spray coater and a drying furnace are prepared in this order for the above sequential treatment. The abrasive composition impregnating device is provided for impregnating the base material sheet strip 10 with the slurry abrasive composition. The abrasive composition is made of ceramics such as Al ₂ O ₃ , Cr ₂ O ₅ etc. having abrasive grains having a particle size of 0.1-100 μm, a binder of epoxy resin or phenol resin, and a binder such as xylene or carbitol. Including solvent. If necessary, a curing agent may be added to this composition.

The heating furnace heats the sheet strip impregnated with the abrasive composition to cure the binder, whereby the abrasive grains are carried on the sheet strip. The furnace may be of the hot air type, but it must be controllable to maintain the temperature of the furnace at the desired level of 100-300 ° C with a fluctuation of ± 10 ° C.

The spray coater includes a container of adhesive composition, an air compressor, a jet nozzle and a Venturi tube to mix the feed compressed air with the adhesive composition added from the container through the Venturi tube and the resulting air. It is provided for spraying the composition containing composition from above toward the upper surface of the sheet strip which is arranged in the horizontal plane. The adhesive composition is 6
A solid epoxy resin having a softening point of 0 ° C. or higher, a curing agent and a volatile solvent are contained and spray-coated,
That is, it may have a viscosity of 1-100 cps for spray application. One example adhesive composition is 100 parts bisphenol A.
Type epoxy resin, 4 parts dicyandiamide and the balance propylene glycol monomethyl ether, and its viscosity is 50 cps. The adhesive composition has one sheet strip
While proceeding at a speed of 0-100 m / min, the upper surface of the strip is sprayed so that the solid content of 3 g / m ² is applied. For the spraying work, the spray coater has a resistance of 0.
It is operated under the conditions of an injection pressure of 5-5 kg / cm ² and an injection speed of 100-1000 g / min.

The dryer is provided to carry the abrasive grains and to dry the sheet strip which is spray coated with the adhesive composition. This device may be of the hot air or elema heating type, but must be controllable to maintain the furnace temperature at the desired level of 50-150 ° C with a variation of ± 10 ° C.

As the first treatment, the starting material roll 100 is used.
The step of impregnating the raw material sheet strip 10 that is unwound from the running state with the abrasive composition using an abrasive composition impregnating device is executed. The resulting strip continues to travel and pass through a heating furnace in which a step of curing the binder in the abrasive composition by volatilizing the solvent and heating the binder is performed as a second treatment. As a result, the abrasive grains dispersed in the binder are fixed to the mesh belt by the hardened binder. These two steps, or processes, are conventionally applied to make the abrasive sheet strip applied in the previously described conventional method of making abrasive disc tools.

The resulting strip, or abrasive sheet strip, is subsequently run past the spray coater. During this passage, as a third treatment, a step of applying the adhesive composition to the strip is performed by jetting the adhesive composition downward from the injection nozzle toward the upper surface of the strip. As a result, the abrasive sheet strip is impregnated with most of the adhesive, while a small amount remains on the top surface.

The abrasive sheet strip with the coated adhesive continues to run and pass through a drying oven in which the fourth
As the treatment of (1), the step of drying the strip is carried out, whereby the solvent of the adhesive volatilizes and the solid epoxy resin exhibits an uncured solid phase. The solid phase of the solid epoxy resin is not sticky and thus the resulting abrasive sheet strip 2
The intermediate material roll 200 formed by 0 is allowed to be rewound without damaging the strip 20 if necessary and can be maintained as a dry roll. In the case of the adhesive containing bisphenol A type epoxy resin, dicyandiamine and propylene glycol monomethyl ether described above, the drying step is carried out at 100 ° C. for 5 minutes in a drying oven. By the way, contrary to the principle of the present invention, the "curable non-solid resin" is adopted as the binder component of the abrasive composition instead of the "curable solid resin" such as the solid epoxy resin as the main component of the adhesive. In the case of a general epoxy resin belonging to "," the abrasive sheet strip is hardened by the complete curing or semi-curing of the adhesive in the drying step, and the compressibility and flexibility are impaired. As a result, in the subsequent brush manufacturing process, this rigid strip loses its effectiveness as a brush intermediate material and is useless.

In FIG. 4, the intermediate material roll 200 is transferred to another rewinding machine (not shown) and mounted there.
This roll 200 has a band 200 punching machine (not shown)
Is rewound so that the vehicle travels intermittently along another work route in which it is arranged. Band 20 to disc sheet 25
The fifth step for making is carried out using a punching machine,
The strip is stamped into disc-shaped pieces having a central hole with a key groove adapted to fit a key formed on a rotating spindle used in an abrasive disc tool. The disc sheet 25 is designed to have an outer diameter of 300-500 mm as required.

The disc sheet 25 can be stored and / or transferred to the workplace where the sixth step for assembling the disc sheet with the temporary jig is carried out for a desired period. The temporary jig corresponds to the temporary jig used in the conventional dipping method described above, and includes the substrate 6, the pressing plate 7 having the central hole, and the substrate 7.
Means (not shown) for releasably retaining the push plate relative to the matching dummy shaft 8 extending upwardly from the center of the substrate and releasably fixed to the substrate and the substrate 6.
Contains. The dummy shaft 8 has a cross section corresponding to the rotary spindle and can penetrate the punched disk sheet 25 and the center hole of the pressing plate.

The assembly process using the temporary jig is carried out as follows. A predetermined number of disc sheets 25 are passed through the dummy shaft 8 on the substrate 6 so that the dummy shafts 8 are stacked in an aligned manner while penetrating through the center holes of the disc sheets.
In this case, each disc sheet 25 is passed through the dummy shaft 8 except for the final disc sheet, that is, the uppermost disc sheet, so that the side opposite to the adhesive application side faces the substrate 6. The last disc sheet is stacked on the adjacent lower disc sheet such that the coating side surface contacts the coating side face of the lower disc sheet. This arrangement prevents the substrate 6 and the push plate 7 from coming into contact with the coating side surfaces of the lowermost and uppermost disc sheets, respectively. In another possible arrangement, one or two belonging to the lower group
A plurality of disc sheets are aligned and stacked so that the coating side faces are aligned as upper faces which are respectively opposite to the substrate 6, and a plurality of disc sheets belonging to the upper group are placed on the lower group on the substrate. 6 are aligned and stacked so that the coated side faces are oriented as the lower face facing 6, so that the lowermost disc sheet of the upper group and the uppermost disc sheet of the upper group are brought into contact with each other on their coated side faces.

The disc sheet groups thus aligned and stacked form a laminated body, and the laminated body is compressed against the substrate 6 by the pressing plate 7. The substrate 6, the pressing plate 7, the dummy shaft 8 and the compression laminated body are retained as an integrated body by the retaining means to form a temporary jig and a compression laminated body.
The retaining means is a nut and a plurality of rods that are arranged at equal intervals in the circumferential direction and extend upward from the substrate 6 in the peripheral region of the substrate outside the laminate, each of which is a nut and a screw. Such a rod having a threaded upper part to be joined,
The push plate 7 is provided with a hole formed at a position corresponding to the position of the rod, through which the rod can pass. Laminate is push plate 7
When the nut is compressed downward at a desired compression ratio, the nut is screwed to the threaded rod portion protruding from the push plate 7 through its hole, thereby preventing the compressed laminated body from being restored. As a result, the laminated body has a thickness 1/3 that of the thickness before compression.
Maintained in compression with the desired wall thickness corresponding to 1/5.

The dummy shaft 8 is then removed from the completed structure. The resulting plurality of components is transferred and placed in a furnace similar to that for curing the abrasive composition in which the dry adhesive in the laminate of each component is cured. The seventh step of is carried out.
In this heating furnace, the solid epoxy resin is cured by the aid of the curing agent. In the adhesive composition of the above-mentioned example, the compression solidification (compact) step, that is, the curing step is performed at 160 ° C. for 2 hours. Each of the components thus treated in the furnace is taken out of the furnace, and then the eighth step is carried out in which the temporary jig is disassembled and the resulting laminate is removed as an abrasive disc brush product.

A comparative test between a polishing tool incorporating a laminating type abrasive disc brush according to the present invention and two prior art laminating type polishing tools called "direct method" and "immersion method". I went. The results are shown in the table below.

[0036]

[Table 1]

[0037]

EFFECTS OF THE INVENTION Abrasive is used in various types of abrasive brush tools such as flap type, spiral type, etc., which are not limited to the laminate type, which has high durability and high polishing performance. It can be realized by the method of the present invention which can produce an abrasive brush without polluting the person. Compared with the conventional dipping method, this method significantly reduces the consumption of adhesive, while the intermediate material and the semi-finished product can be handled in a dry state in the step subsequent to the adhesive application step, so that the handling labor is increased. It can be easily executed in a short time without needing it, and also brings high productivity.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of a conventional abrasive disc tool produced by a so-called “direct method” without using an adhesive.

FIG. 2 is a process explanatory view of a conventional method based on a so-called “immersion method”.

FIG. 3 is a process drawing showing a preceding process in the method for manufacturing the abrasive disc brush according to the present invention.

FIG. 4 is a process explanatory view showing a succeeding process subsequent to the preceding process of FIG. 3 in the method according to the present invention.

FIG. 5 is a perspective explanatory view illustrating the types of polishing brush types that are the subject of the present invention.

[Explanation of symbols]

 2 ... Spindle 3, 4 ... Disk plate 5 ... Brush F ... Flower opening phenomenon 6 ... Substrate (temporary jig) 7 ... Push plate (temporary jig) 8 ... Dummy shaft (temporary jig) 10 ... Base material sheet band 20 ... Abrasive sheet strip 25 ... Abrasive disc sheet 30, 40 ... Disc plate (of temporary jig) 50 ... Disc sheet 60 ... Laminate 100 ... Starting material roll 200 ... Intermediate material roll

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[Procedure amendment]

[Submission date] January 29, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

One of the important principle features of the present invention is that a curable solid resin is used as the main component of the adhesive and the adhesive is once dried before curing. As the curable solid resin, a solid epoxy resin, a solid urea resin, a solid urethane resin, a solid phenol resin, or the like can be used, but the solid epoxy resin is particularly preferable. For the adhesive, Japanese Patent Application No. 7-208013 of the present applicant is used.
A composition containing a solid epoxy resin having a softening point of 60 [deg.] C. or higher, a curing agent and a solvent, which is disclosed in JP-A No. 1994-242, is preferable. The solid epoxy resin is cresol novolac type epoxy resin, bisphenol A type epoxy resin,
It may be at least one selected from the group consisting of bisphenol F type epoxy resin, phenol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, naphthalene type epoxy resin, fluorene epoxy resin and glycidyl amine compound. The curing agent is preferably one or more selected from the group consisting of dicyandiamide, acid hydrazide, borane trifluoride complex, imidazole compound, amine imide and lead salt. One of the curing agents of choice is dicyandiamine (DICY). Each abrasive disc sheet is composed of a flexible material sheet having a compressible mesh structure, which is a non-woven fabric, a woven cloth or a sponge sheet, and abrasive grains bonded to the material sheet.

Claims (6)

[Claims] 1. A polishing brush of a spiral type, a laminate type, a flap type or the like, which is a single or multiple polishing sheets having a compressible mesh structure, and which is composed of an adhesive arranged according to the brush type and then cured. In a polishing brush used in a polishing tool comprising such a polishing sheet that has been compressed and solidified, the curing adhesive is a curable solution containing a curable solid resin, a curing agent and a volatile solvent. And each abrasive sheet prior to the sheet arrangement for the brush type is impregnated with the adhesive solution supplied from at least one of its two sides and the solvent is volatilized by subsequent drying. Abrasive brush, characterized in that it is 2. A plurality of disc-shaped polishing sheets having a compressible mesh structure, each polishing disc sheet containing a curable solid resin, a curing agent and a volatile solvent, which are applied in advance on at least one side surface. Of the resin-based adhesive solution, the entire polishing disk sheet has one side surface where at least one of the adjacent polishing disk sheets faces the other in the uncured and dried state of the adhesive agent. A laminating type abrasive brush for use in an abrasive tool, comprising an abrasive sheet of such construction which is stacked in registration and then compressed and solidified in the manner it has as an application surface. 3. Each polishing sheet comprises a flexible sheet base material having a compressible mesh structure and abrasive grains adhered thereto by a resin binder, and the adhesive solution contains a solid epoxy resin. The polishing brush according to claim 1, which is a composition contained as the curable solid resin. 4. The solid epoxy resin of the adhesive composition is 6
Cresol novolac type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin, trishydroxyphenylmethane type epoxy resin, naphthalene type epoxy resin, fluorene epoxy having a softening point of 0 ° C. or higher. The polishing brush according to any one of claims 1 to 3, which is at least one selected from the group consisting of a resin and a glycidyl amine compound. 5. The catalyst according to claim 1, wherein the catalyst is at least one selected from the group consisting of dicyandiamide, acid hydrazide, borane trifluoride complex, imidazole compound, amine imide and lead salt. Abrasive disc. 6. A method of manufacturing a laminating type polishing brush, wherein a polishing tool is constructed by assembling a holder and a rotary spindle together: a flexible substrate having a compressible mesh structure. Prepare a continuous strip of sheets;
The base sheet strip is impregnated with a slurry of an abrasive composition containing abrasive grains, a curable binder and a volatile solvent; the coated strip is heated to cure the abrasive composition. , By which the abrasive grains are transformed into a polishing sheet band carried on the substrate sheet band by the binder, which hardens the substrate sheet band; and the polishing sheet band has at least one of both side surfaces thereof. A liquid adhesive composition containing a solid epoxy resin, a curing agent and a volatile solution is applied to one side; the coated abrasive sheet strip is dried at a predetermined temperature for volatilization of the solvent; Forming a group of individual abrasive sheets of a given disk contour having a central hole by stamping; applying a temporary jig assembled to stack and compress the resulting abrasive disk sheets in alignment. Adjacent to the temporary jig by A laminate comprising a predetermined number of abrasive disc sheets stacked in alignment and compressed in such a manner that at least one of the abrasive disc sheets has one side facing the other as the adhesive application surface. Preparing a composition comprising: heating the composition at a predetermined temperature higher than that of the drying step for curing the dry adhesive composition in the laminate, and polishing the resulting laminate in one piece. A method for producing a polishing brush, comprising the above steps, wherein the temporary jig is removed as a brush by disassembling it.