JPH0732268A - Discrimination of abrasive tape - Google Patents

Abstract

PURPOSE:To improve workability of a polishing process by visually and easily discriminating a mesh number of an abrasive tape. CONSTITUTION:This is a discrimination method of an abrasive tape to discriminate a gage of the abrasive tape by coloring a core center or a reel center around which the abrasive tape having a polishing layer with abrasive particles and binder resin as its main body on a flexible support body is wound in correspondence with an item number of the abrasive tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for identifying a product number of an abrasive tape, and more particularly to an identifying method useful for an abrasive tape having a colored abrasive layer.

[0002]

2. Description of the Related Art Abrasive tapes having an abrasive layer mainly composed of abrasive particles and binder particles on a flexible support are used for various purposes such as polishing of magnetic heads, substrates for liquid crystals, color filters and magnetic disks. It is used for the objects to be polished.

Various types of roughness (mesh) of the polishing layer are prepared according to the finishing accuracy required for the object to be polished, and the polishing tape has various standardized mesh numbers (article numbers). Is attached.

Depending on the purpose, it may be necessary to use two or more types of polishing tapes even for the same type of object to be polished, and it is necessary to identify the polishing tape of the intended product number from among various types. there were.

On the other hand, the abrasive particles in the polishing layer are usually those having a Mohs hardness of 6 or more. Examples thereof include chromium oxide, α-iron oxide, alumina, titanium oxide, silicone carbide, diamond and the like.

It is difficult to visually determine the roughness of the surface of the polishing layer, and a simple visual identification method has been required in some way. If the abrasive particles are white, such as alumina or titanium oxide, a method has been devised and implemented in which a method of identifying a polishing tape of a specific color for each product number by mixing a dye or the like and coloring the product is used. As described above, there are various kinds of abrasive particles colored other than white, for example, iron oxide is colored brown, chromium oxide is colored green, and silicon carbide is colored gray, and these abrasive tapes are colored. It was impossible because of mixed colors. Therefore, it was impossible to visually infer the product number of the green polishing tape containing chromium oxide as abrasive particles taken out from the bag.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and provides a method for improving the workability of the polishing process by visually and easily identifying the mesh number of the polishing tape. It is intended to be provided.

[0008]

The above object of the present invention is to provide a core or reel core around which a polishing tape having an abrasive layer mainly containing abrasive particles and a binder resin is wound around a flexible support. This is achieved by a method of identifying a polishing tape by identifying the number of the polishing tape by coloring the number corresponding to the number of the polishing tape.

Usually, an abrasive tape having an abrasive layer on a flexible support is wound around a core core or a reel core (hereinafter referred to as a core core, etc.) and supplied to a user. The polishing tape is used in a state of being wrapped around the core or the like. Therefore, the product number of the polishing tape can be easily visually identified and used according to the color of the core or the like.

According to the method of the present invention, even if the polishing tape is colored with the unique color of the abrasive particles, the polishing tape is colored by coloring the core core in accordance with the product number separately from the color of the polishing layer. The product number of can be identified.

The method of the present invention will be specifically described below. (1) First, color the polishing tape core cores, winding cores, reels with flanges, etc. according to the mesh numbers as follows. Abrasive tape and its color Abrasive tape part number and color of core core, etc. ----------------------------------------------- − # 20000 # 10000 # 8000 # 6000 # 4000 # 2000 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Oxidation Aluminum polishing tape (white) (blue) (yellow green) (green) (orange) (red) (white) Chrome oxide polishing tape (green) (blue) (yellow green) (green) (orange) (red) (White) Silicon carbide polishing tape (gray) (blue) (yellow green) (green) (orange) (red) (white) Iron oxide polishing tape (brown) (blue) (yellow green) (green) (orange) ) (Red) (white) --------------------------------------------- Separated by color, the same green tape (oxidized Core Tefu °) Any ROM is that it is blue #
It can be identified as 20,000.

A slight difference in the grindability of the polishing tape depending on the type of the polishing agent can be identified by the color of the tape, and the mesh number can be identified by the core core.

(2) The core and the like may be made of resin colored. The resin may be processed by injection molding or cut-out processing, and as the material, vinyl chloride, vinyl chloride, polypropylene, polyoxymethylene, ABS resin or the like can be used. A commercially available dye or coloring pigment for differentiating the resin can be used.
Inner diameter of core is 1 inch, 2 inch, 3 inch, etc.
It is sufficient if the strength is at least mm and the strength can be secured. Generally 3 mm
-20 mm is preferable. The width is 0 to + relative to the width of the tape
It is desirable to be in the range of 50 mm.

(3) As a specific example used for actual polishing, the magnetic head polishing step will be described. In the rough polishing step, the number is mainly 2000 (grain size 9 μm) to 10000 (grain size 0.5 μm), especially 4000. No. (grain size 3 μm) to 80
No. 00 (particle size 1 μm) is often used. In the precision polishing process, mainly No. 10000 (grain size 0.5 μm) to 3
No. 0000 (particle size 0.07 μm), especially No. 10000 (particle size 0.5 μm) to 20000 (particle size 0.1 μm)
Are often used. Part numbers of these polishing tapes are
The material to be polished is selected at any time depending on the object to be polished and the purpose of polishing, but it is difficult to distinguish between them by the appearance of the polishing tape alone, and therefore the core core can be easily identified by coloring.

The polishing tape in the method of the present invention is not particularly limited and can be applied to known polishing tapes.

For example, as an abrasive usable in the polishing layer, chromium oxide having an average particle size of 0.05 μm to 1 μm, α-alumina, silicon carbide, non-magnetic iron oxide, diamond, γ-alumina, α, γ- Alumina Fused alumina, cerium oxide, corundum, artificial diamond, garnet, emery (main component: corundum and magnetite), garnet, silica, silicon nitride, boron nitride, molybdenum carbide, boron carbide, tungsten carbide, titanium carbide Among them, there are mainly combinations of 1 to 4 kinds of materials having a Mohs hardness of 6 or more.

As the binder resin used in the polishing layer, conventionally known thermoplastic resins, thermosetting resins, reactive resins, electron beam curable resins, ultraviolet curable resins, visible light curable resins and mixtures thereof. Is used.

Examples of the thermoplastic resin include vinyl chloride type copolymers, acrylic type copolymers, urethane elastomers, nylon-silicone resins, and nitrocellulose.
Polyamide resin, polyvinyl chloride, vinylidene chloride acrylonitrile copolymer, butadiene acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose resin, thermosetting resin such as phenol resin, phenoxy resin, Various resins such as epoxy resin, polyurethane resin, polyester resin, polyurethane polycarbonate resin, urea resin and melamine resin can be used.

A polyisocyanate compound is used as a curing agent for the binder resin.

In addition, carbon black such as rubber furnace, rubber thermal, color black, and acetylene black is used in the polishing layer as an antistatic agent for the polishing tape, a light-shielding agent, a friction coefficient adjusting agent, and durability improvement. Used for the purpose.

The polishing layer includes graphite, molybdenum disulfide, boron nitride, graphite fluoride, calcium carbonate, barium sulfate, silicon oxide, titanium oxide, zinc oxide, tin oxide, inorganic fine powder such as tungsten disulfide, and acrylic styrene. Resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, polyfuccaethylene resin powder, etc. Powdered lubricant such as resin fine powder, various silicone oils,
Fluorine-containing compounds such as fluorofatty acids and perfluorofatty acid esters, organic lubricants such as alkyl sulfates, alkyl sulfonates and fatty acid esters may be used and added.

Further, in the polishing layer, an antioxidant which is known as a rust preventive, a rust preventive such as naphthenic acid, an oily agent such as rapeseed oil, an extreme pressure agent such as dibenzyl sulfide, and a detergent dispersant. The properties can be improved by adding various additives such as a viscosity index improver, a pour point depressant, and a foam depressant.

In addition, when adjusting the coating liquid for the polishing layer, a dispersant such as various fatty acids or a dispersion aid can be used to improve the dispersion of the abrasive particles.

The method of using these dispersants may be such that they are pre-deposited on the surface of the abrasive particles, or they may be added during dispersion.

The polishing layer is formed by dissolving any one of the above-mentioned compositions in an organic solvent, applying it as a coating solution on a support, and drying the solution to form it on a flexible support.

The thickness of the flexible support is 2.5 to 500 μm,
It is preferably 3 to 50 μm.

Either the longitudinal direction or the width direction of the flexible support
Young's modulus of 400 kg / mm ²Be more than
desirable. As material, polyethylene terephthalate,
Polyester such as polyethylene naphthalate, polyp
Polyolefins such as ropylene, cellulose striacete
, Cellulose derivative such as cellulose diacetate,
Vinyl resins such as polyvinyl chloride, polycarbonate
G, polyimide, polyamide, polysulfone, polyphe
Nylsulfone, polybenzoxazole, etc.
Is desirable.

Prior to coating, the flexible support is subjected to corona discharge treatment, plasma treatment, undercoat treatment, heat treatment,
You may perform dust removal processing, metal adhesion processing, and alkali processing.

The center line average surface roughness of the flexible support is 0.
001 to 1.5 μm (cutoff value 0.25 mm) is preferable.

The method of dispersion and kneading is not particularly limited.

For preparing the coating liquid for the polishing layer, a conventional kneading machine,
For example, two-roll mill, three-roll mill, ball mill, pebble mill, tron mill, sand grinder, Szegvari attritor, high speed impeller, disperser, high speed stone mill, high speed impact mill. ，
Disperser, Kneader, High Speed Mixer, Ribbon Blender, Conider, Intensive Mixer, Tumbler,
A blender, a disperser, a homogenizer, a single-screw extruder, a twin-screw extruder, and an ultrasonic disperser can be used.

There is no particular limitation on the method of applying the above-mentioned polishing layer coating solution onto the flexible support, and various known methods can be applied.

By this method, about 1 to about 1 is formed on the support.
Immediately after applying the polishing layer coating liquid of about 100 μm,
After performing multi-stage drying at 0-130 ℃,
The formed polishing layer is dried to a thickness of 0.1 to 10 μm. The transport speed of the support at this time is usually 10 m / min to 900
The drying temperature is 2 in multiple drying zones.
The amount of residual solvent in the coating film is controlled at 0 ° C to 130 ° C to
40 mg / m ² . If necessary, a back layer may be provided in the same procedure, and then a surface smoothing process is performed to make the center line average surface roughness of the polishing layer or the back layer 0.00
The abrasive tape of the present invention is manufactured by cutting it into a desired shape with a cutoff value of 1 to 0.3 μm (cutoff value of 0.25 mm). These manufacturing methods include powder pretreatment / surface treatment,
It is desirable to continuously carry out the steps of kneading / dispersion, coating / drying, smoothing treatment, heat treatment, EB treatment, surface cleaning treatment, cutting and winding. The abrasive tape thus produced is cut and then wound on a desired core core, winding core, or reel with flange. It is desirable to burnish and / or clean the polishing tape (polishing layer, back layer, edge surface, base surface) immediately before or before winding. In order to control the surface roughness and polishing power of the polishing tape, the burnishes are specifically sapphire blades, razor blades, super hard material blades, diamond blades, ceramic blades, and the like to remove the protrusions on the surface of the polishing tape. Make it even or smooth. $ In addition, cleaning of the polishing tape is performed by wiping the polishing layer surface, back layer surface, edge end surface, and back side base surface with a non-woven fabric or the like for the purpose of removing dirt on the polishing tape surface and excess lubricant. . As such a wiping material, for example, various Vileen made in Japan Vilene or Toray made Toray, Exeine, product name Kimwipe, and non-woven fabric made of nylon, non-woven fabric made of polyester, non-woven fabric made of rayon, non-woven fabric made of acrylonitrile, blended non-woven fabric, etc. Tissue paper etc. can be used.

[0034]

EXAMPLES The method of the present invention will be described more specifically by the following examples. In the following, “part” means “part by weight”.

[Examples and Comparative Examples] An undercoat layer made of a polyester polyurethane resin was applied in a thickness of 0.1 μm on a polyethylene terephthalate (PET) support having a thickness of 25 μm, and a polishing layer adjusted with the following composition was applied thereon. The coating liquid for coating was bar-coated so as to have a thickness of 10 μm after drying to prepare a polishing tape. Composition of coating liquid Abrasive (granular) ... See Table 1 100 parts Binder (polyester resin) 8 parts Binder (polyurethane, sodium sulfonate 2 × 10 ⁻³ eq / g resin included, Mw 70000) 5 parts Epoxy group 1 × 10 ^-5 equivalent / g resin Binder (polyisocyanate, TDI (3 mol) adduct of trimethylolpropane (1 mol)) 5 parts Dispersant (copper oleate / phthalocyanine = 1/1) 0.1 part Lubricant ( Stearic acid / oleyl oleate) 0.1 part Diluent (methyl ethyl ketone / cyclohexanone = 2/1) 200 parts Diluent (toluene / MIBK) 150 parts Additive (carbon black) 10 parts

The prepared polishing tape is 1 inch inside diameter and 32 meters outside diameter.
It was wound on a core core made of polypropylene (hard: soft = 5: 5) colored in each color as shown in Table 1 of m 1 inch.

At that time, blue is phthalocyanine blue, white is titanium white, black is carbon black, gray is titanium white / carbon black mixture, green is malachite green, brown is iron oxide, red is cadmium red and pink. Was colored by kneading the pigment with a mixture of titanium white and cadmium red.

Table 1 -------------------------------------------------------------------------------------------------------- Abrasive color of core core of polishing tape Size of product number ---------------------------------------------- ------------------------- Example 1. Alumina white 0.1μ # 20000 white Example 2. Alumina white 0.3μ # 15000 red Example 3 .Alumina white 0.5μ # 10000 orange Example 4. Alumina white 1.0μ # 8000 yellow Example 5. Alumina white 2.0μ # 6000 green Example 6. Alumina white 3.0μ # 4000 yellow green Example 7. Alumina white 5.0μ # 3000 Sky blue Example 8. Alumina white 9.0μ # 2000 Blue Example 9. Alumina white 12.0μ # 1200 Purple ------------------------ ----------------------------------------------- Comparative Example 1 .Alumina White 0.1μ # 20000 Black Comparative Example 2. Alumina White 0.3μ # 15000 Black Comparative Example 3. Alumina White 0.5μ # 10000 Black Comparative Example 4. White White 1.0μ # 8000 Black Comparative Example 5. Alumina White 2.0μ # 6000 Black Comparative Example 6. Alumina White 3.0μ # 4000 Black Comparative Example 7. Alumina White 5.0μ # 3000 Black Comparative Example 8. Alumina White 9.0μ # 2000 Black Comparative Example 9. Alumina White 12.0μ # 1200 Black -------------------------------------- --------------------------------- Example 10 Alumina White 0.5μ # 10000 Orange Example 11. Iron oxide brown 0.5μ # 10000 orange Example 12. SiC gray 0.5μ # 10000 orange Example 13. Chromium oxide green 0.5μ # 10000 orange Example 14. Dyamond pink 0.5μ # 10000 orange ----------- -------------------------------------------------- -----------

In Examples 1 to 9, the mesh number could be easily identified by the color of the core, but it was not possible in Comparative Example.

In Examples 10 to 14, polishing tapes having the same product number could be identified by the color of the tape.

[0041]

EFFECTS OF THE INVENTION By coloring the core and the like of the polishing tape with a specific color corresponding to the product number, the mesh of the tape can be identified even if the tape is colored with the abrasive. In Examples 1 to 9, the mesh number could be easily identified by the color of the core, but it was not possible in Comparative Example.

Claims (2)

[Claims] 1. A core core or reel core around which a polishing tape having a polishing layer mainly composed of abrasive particles and a binder resin is wound on a flexible support is colored in accordance with the product number of the polishing tape. A method for identifying a polishing tape by which the number of the polishing tape is identified. 2. The method for identifying a polishing tape according to claim 1, wherein the abrasive particles have a color other than white.