JP3853437B2 - Polishing sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an abrasive sheet used for the end face of an optical connector ferrule, the surface of a silicone wafer, a glass lens, a precision finish polishing of a mold, etc. It belongs to the polishing sheet which prevented the grinding | polishing by the side of a base film, and is described as a back surface below.
[0002]
[Prior art]
Finishing polishing of precision machine parts, magnetic heads, magnetic disks, and the like, and precision finishing polishing of molds are required to have a fine surface accuracy in units of micron or submicron. For such precision finish polishing, a polishing sheet containing a high hardness inorganic fine particle is provided on a base film, and a polishing sheet having an extremely small surface roughness is used.
[0003]
In particular, when carrying out precision finishing of optical connector ferrules, silicone wafer surfaces, glass lenses, etc., as shown in FIG. 2, a polishing tape is put on a rubber pad 7 installed on a rotating jig 8 of a polishing apparatus 9 in a desired size and shape. It is known that the polishing work is performed by attaching and fixing the polishing sheet 1 produced by cutting or removing the sheet. A method is known in which the abrasive sheet is fixed by utilizing the slight adhesiveness of the rubber pad surface without providing an adhesive or adhesive on at least a part of the back surface.
[0004]
The closer the polishing process is to the finishing stage, the smaller the average particle diameter of the abrasive particles of the polishing sheet to be attached to the rubber pad is used. Therefore, since the surface of the polishing layer of the sheet is smooth, it is difficult to distinguish the polishing layer from the back surface, and there is a problem of misuse that polishing is performed on the back surface. In order to solve this problem, polishing sheets with a seal indicating the front and back of the polishing layer are in circulation.
[0005]
The abrasive sheet with the seal attached requires time and cost for the process of attaching the seal. Further, when the polishing process is wet polishing using a polishing liquid or a lubricating oil, there is a problem that the attached seal is peeled off or dropped and mixed into the polished surface, or a seal adhesive is mixed.
[0006]
[Problems to be solved by the invention]
Polishing sheets used for ultra-precise polishing such as for optical connector ferrule end faces are used to finish the object to be polished into a mirror-like surface. The average particle size of the abrasive in the polishing layer is as fine as 10 μm or less. Therefore, the center line roughness (Ra) on the surface of the polishing layer is often as smooth as 10 μm or less. On the other hand, a polyester film is widely used as the base film for the polishing sheet, and since the physical properties are transparent and the surface is smooth, the polishing sheet surface of the polishing sheet and the back surface on which the polishing layer is not formed. There was a problem that it was difficult to discriminate. When the polishing layer had transparency or semi-transparency, and the total light transmittance of the polishing sheet itself was 90% or more and the haze was 60% or less, it was more difficult to distinguish the front and back.
[0007]
The user attaches the back surface of the polishing sheet to the rubber pad 7 of the polishing apparatus 9 shown in FIG. 2, brings the object to be polished 10 attached to the fixing jig 6 into contact with the polishing layer 4, and sets the rotating jig 8 The object to be polished 10 is mirror-finished by rotating or revolving. However, since the polishing sheet 1 and the polishing layer 4 are smooth and transparent, there is a problem that the polishing layer and the back surface are wrongly attached to the rubber pad. An object of the present invention is to provide a polishing sheet that can easily determine the distinction between the polishing layer and the back surface.
[0008]
[Means for Solving the Problems]
To achieve the above object, the polishing sheet of the present invention is a transparent polishing sheet comprising a polishing layer on one side of a base film, and the polishing layer side is used to determine the provided polishing layer surface. abrasive sheet der having an identification part asymmetric can determine that the non-abrasive portions existing central portion in the a polishing layer is,
[0009]
Moreover, the above-mentioned identification unit is an abrasive sheet formed by unplug machining polishing film.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 2, the polishing sheet of the present invention has a polishing sheet 1 provided with a polishing layer 4 on one side of a base film 5 and is attached to a polishing apparatus 9 and attached to a fixing jig 6. polishing body 10, are polished by rotation of the rotation or revolution in the polishing section 2 of the abrasive sheet 1 shown in FIG. 1, non-abrasive portion 30A and the peripheral non-abrasive central While not in contact with the object to be polished 10 on abrasive sheet periphery and center This is focused on having the part 30B.
[0011]
In order to discriminate the polishing layer 4 provided on one side of the substrate film 5 shown in FIG. 2, the polishing sheet of the present invention has a polishing layer surface at the center of the peripheral part or the center part as shown in FIG. Ri abrasive sheet der having an identification part 3 for discriminating,
[0012]
Moreover, the identification unit 3 of the center of the are the abrasive sheet formed by unplug machining.
[0013]
The base film of the polishing sheet of the present invention can be appropriately selected from a film having a sufficient strength to withstand polishing work and a strength and heat resistance to withstand coating and drying of the abrasive. For example, polyolefin resin such as high-density polyethylene and polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polyacrylonitrile, polyamide, acrylic ester or methacrylic ester It is a stretched or unstretched film made of an acrylic resin, polyethylene terephthalate, polybutylene terephthalate, polyester such as polyethylene naphthalate, polyacetal, di- or tri-acetyl-cellulose fiber derivative, polycarbonate or the like. In particular, it is preferable that the thickness of the polyethylene terephthalate, nylon 6 biaxially stretched film or polyimide film excellent in coating suitability for the polishing layer, suitability for post-processing of the abrasive sheet and handling in a grinder is 12 to 100 μm.
[0014]
It is preferable to add an antistatic agent to the base film in order to prevent adsorption of dust due to static electricity generated during handling. As the antistatic agent, a normal nonionic surfactant, an anionic surfactant, a cationic surfactant or the like, a polyamide derivative, an acrylic acid derivative, or the like can be appropriately selected and added.
[0015]
The fine particles used for the abrasive are, for example, silica, aluminum oxide, silicon carbide, silicon nitride, boron nitride, zirconium oxide, chromium oxide, diamond, emery and the like having a particle size of 0.01 to 100 μm. Moreover, the fine particle diameter of the abrasive in the precision finish polishing described in the present invention is widely used in the range of 0.001 to 10 μm.
[0016]
The binder of the polishing layer is composed of various plasticizers such as saturated polyester, polyurethane, vinyl chloride / vinyl acetate copolymer, vinyl butyral, acrylic resin, polyalkylsiloxane, nitrified cotton, chlorinated rubber, cyclized rubber, etc. In addition, reactive types such as polyester polyol / polyisocyanate, polyether polyol / polyisocyanate, alkyd resin and the like are also used.
[0017]
Coating of the polishing layer is usually performed on a vehicle prepared by dissolving in a solvent in consideration of the solubility of the fine particles and the binder, the solvent removal property, and the coating method (fluidity, drying property, etc. in the coating part). The polishing layer coating solution dispersed in (1) is used. The coating method is selected according to the shape of the coated surface, the coating amount and the coating accuracy, and is performed by direct or reverse coating such as normal roll coating, gravure coating, bar coating, and the like. Further, when a special shape is formed on the surface of the polishing layer, coating with a gravure plate is an advantageous method. And the application quantity is 1-30 g / m < ² > by solid content. Moreover, in order to firmly and firmly adhere the polishing layer and the base film, it is preferable to provide a primer layer on the base film. The primer layer can prevent blocking by the polishing layer even if the primer layer is slightly sticky, in addition to the varnish made of the same material as the binder. Therefore, it can be selected from materials having affinity for the base film and having a low glass transition point and strong adhesion.
[0018]
As shown in FIGS . 3 and 6 , the discriminating portion provided on the polishing sheet of the present invention has at least one non-polishing portion 30A, 30B shown in FIG. it is also in the central non-abrasive portion 30A of the central portion, when forming the abrasive sheet 1 having the desired shape, corresponding to the process, or configure more simultaneously and disconnect, or created in a separate step by the shape can do. Of course, it can also be processed at the polishing work station according to the shape of the polishing apparatus and the material to be polished.
[0019]
The discriminating part 31 provided at the center part of the non-polished part shown in FIG. The discriminating unit 31 provided in the central portion needs to be asymmetrical in order to discriminate the top and bottom and can be selected from characters, illustrations and the like that can be easily confirmed. However, care should be taken because the adhesive provided on the rubber pad may be deposited on the surface depending on the shape of the identification part.
[0020]
Incidentally, it is possible to perform simultaneously in the step of removing the abrasive sheet cut-out portion 21 in the identifying section 32 (but not where the recognition unit corresponds to the present invention) provided on ears on the periphery of the abrasive sheet shown in FIG. The identification units 32 provided at two locations need to be configured at asymmetric positions. The ear-shaped identification part 32 has a suitable effect as a knob when peeling off from the rubber pad after finishing the polishing operation.
[0021]
Incidentally, the simultaneous with the step of removing the abrasive sheet cut-out portion 21 in the vent concave identifying section 33 (although the present invention the non-relevant identification part) provided in the peripheral portion lacking vent to the periphery of the abrasive sheet shown in Figure 5, or polished After creating the desired shape of the sheet, it can be formed by cutting or punching the mark shape. The identification parts 33 provided at two places need to be configured at asymmetric positions. Depending on the shape of the identification portion, the adhesive provided on the rubber pad may be deposited on the surface, so care must be taken.
[0022]
The tongue-shaped discriminating portion 34 provided at the center of the non-polished portion shown in FIG. The tongue-shaped discriminating portion 34 provided at the center portion does not necessarily need to be asymmetric because it has a standout. It is preferable to select the material to be transported in the extracted state from characters, illustrations, etc. that are asymmetrical and can easily confirm the polishing layer. The tongue piece of the identification part provided in the center part of the polishing sheet has an effect of preventing the adhesive applied to the rubber pad from being deposited on the surface.
[0023]
Incidentally, it is possible to perform simultaneously with the punching process of the abrasive sheet punching unit 21 in punching stand type identifying section 35 provided in the ear (although the present invention the non-relevant identification part) on the periphery of the abrasive sheet shown in Figure 7. The tongue-like discriminating portion 35 provided in the peripheral portion does not necessarily need to be asymmetric because there is a stand-up type. It is preferable to select the material to be transported in the extracted state from characters, illustrations, etc. that are asymmetrical and can easily confirm the polishing layer. The ear piece 35 of the discriminating type identification part can have a suitable effect as a knob when it is peeled off from the rubber pad after finishing the polishing operation.
[0024]
8, the identification of the polishing sheet length of the two sides is formed in a different rectangular identifies the right and left by the difference of the length of its further upper and lower forms a cutting portion 13 of the corner two It can be determined by providing an identification part by cutting on the side (however, an identification part not corresponding to the present invention) . For example, the corner cut identifying unit 36 shown in FIG. 8A in which one corner is simply cut off, the corner cut shape identifying unit 37 in which the cut shown in FIG. 8B is cut, and the cut shown in FIG. The corner ear-shaped identification part 38 formed or the corner hole-shaped identification part 39 formed with a hole near the corner can be provided.
[0025]
Equal length of the four sides, the are not square or illustrated providing the identification part of the present invention to rhombic abrasive sheet, like the circular abrasive sheet, FIGS. 3, at the center thereof as shown in FIG. 6 3 and likewise it is possible to form the central portion vent identifying unit 31, central portion tongue shape identifying unit 3 4 medium asymmetrical. Note that the square-shaped polishing sheet can be prepared from the polishing film by simple cutting that does not require a punching die. However, the identification unit 36 by simple cutting or punching at the corner shown in FIGS. 8 (A) to (D), In the shapes of 37, 38 and 39, it is difficult to specify the left and right positions. In such a case, as shown in FIG. 9, it is possible to provide the corner portion irregular shape identifying portion 40 (however, the identifying portion not applicable to the present invention) in a shape different from two corners adjacent to one corner.
[0026]
【Example】
(This is a reference example that does not correspond to the present invention in that the identification part is provided in the peripheral part, but is a reference example that is helpful in other parts.)
As the base film 5, a polishing film 10 having a polishing layer 4 was prepared by applying 5 g / m 2 of a polishing layer coating solution having the following composition on the treated surface of a 75 μm thick easily-adhesive polyester film.
(Coating liquid for polishing layer)
・ Organosilica sol average particle size 0.07μm 70 parts by weight
Alcohol solvent, solid content 30%
・ 30 parts by weight of polyalkylsiloxane resin solution
Alcohol solvent, solid content 30%
The surface of the polishing layer 4 of the polishing film is smooth with a center line average roughness (Ra) of 0.05 μm, and the polishing film is transparent with a total light transmittance of 90% and a haze of 50%. It was difficult to distinguish the polishing layer from the back surface.
[0027]
The polishing film 10 constituted the abrasive sheet 1 provided with the identification portion 3 having a shape of a peripheral ear vent identifying section 32 shown in FIG. 4 the non-abrasive portion 30 B shown in FIG. Despite the fact that the gloss of the front and back surfaces was very similar, the polishing sheet 1 could be easily discriminated by the discriminator 3 and provided on the rubber pad 7 of the polishing apparatus 9 shown in FIG. Further, after use, the identification part 3 was picked and peeled off from the rubber pad 7.
[0028]
【The invention's effect】
An effect that can discriminate between Ken Migakuso and back. Therefore, the particles of the polishing layer used for ultra-precision polishing are smooth with a surface roughness (Ra) of 10 μm or less, a total light transmittance of 90% or more, and a haze of 60% or less. Even in the case of a polishing sheet that has a difficult to distinguish from the back surface, it was possible to easily distinguish the polishing layer surface from the back surface . Its to the identification unit does not use a different, such as pasting a seal, but good productivity can be processed in the same step when creating a polishing sheet having a desired shape.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a position where an identification portion is provided on a polishing sheet.
FIG. 2 is a schematic cross-sectional view of a polishing apparatus provided with a polishing sheet.
FIG. 3 is a schematic plan view of a polishing sheet having an identification portion at the center.
FIG. 4 is a schematic plan view of a polishing sheet provided with an ear-shaped discriminating part in the peripheral part.
FIG. 5 is a schematic plan view of a polishing sheet provided with an identification portion of another shape in the peripheral portion.
FIG. 6 is a schematic plan view of a polishing sheet provided with a tongue-shaped discriminating portion at the center.
FIG. 7 is a schematic plan view of a polishing sheet in which an ear-shaped identification part is provided in the peripheral part.
FIG. 8 is a schematic plan view illustrating an identification unit provided on a rectangular polishing sheet.
(A) It is an example of a corner cutting identification part.
(B) It is an example of a corner cut identification part.
(C) It is an example of a corner ear-shaped identification part.
(D) It is an example of a corner hole shape identification part.
FIG. 9 is a schematic plan view in which an identification portion is provided on a square-shaped polishing sheet.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Polishing sheet 2 Polishing part 3 Identification part 4 Polishing layer 5 Base film 6 Fixing jig 7 Rubber pad 8 Rotating jig 9 Polishing apparatus 10 To-be-polished part 21 Cutting part 21 Polishing sheet extraction part 30A Central non-polishing part 30B Peripheral non-polishing Part 31 Center part identifying part 32 Peripheral part ear-like part identifying part 33 Peripheral part removing part-like identifying part 34 Center part tongue-like part identifying part 35 Peripheral part tongue-like part identifying part 36 Corner cutting part identifying part 37 Corner cut part identifying part 38 Corner ear Shape identifying part 39 Corner hole shape identifying part 40 Corner irregular shape identifying part

Claims (1)

A one transparent polishing sheet comprising an abrasive layer provided on the side of the base film, in order to determine the polishing layer surface provided is the abrasive layer to the non-abrasive portions existing central portion in the polishing layer side abrasive sheet, wherein the identification part of the asymmetric can be determined is, the formation isosamples formed by punching the.

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