JPH0750146Y2 - Polishing tape with end marks - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention is a polishing tape used for finish polishing of magnetic heads and magnetic disks, precision finish polishing of optical fiber end faces, and further precision finish polishing of dies. Regarding

"Prior Art" It is often desired that the surfaces of magnetic heads, magnetic disks, etc. used for precision machine parts, precision electronic parts, etc. be finished to a precision surface of, for example, micron or submicron order.

For this reason, in place of the grindstone that has been used for a long time, in recent years, abrasive particles made of inorganic fine powder having high hardness are used as a resin liquid on a polishing tape substrate made of synthetic resin film or synthetic paper made of polyester or the like. A polishing tape (Japanese Patent Publication No. 53-44714) in which a dispersion resin liquid of abrasive particles dispersed therein is applied and dried to form a polishing layer is used.

"Problems to be solved by the invention" By the way, when polishing the surface of a magnetic head, a magnetic disk, or the like, the polishing tape wound in a roll is automatically fed to perform the polishing work. Polishing tape has the complication that it is not easy to detect the end of the polishing tape and the time of roll replacement of the polishing tape must be monitored. This is a major obstacle to achieving full automation.

On the other hand, the present invention can detect the end portion of the polishing tape wound in a roll by the sensor,
A polishing tape capable of accurately determining the time of roll replacement of the polishing tape, wherein the polishing tape wound in a roll shape is subjected to embossing deformation by the terminal display layer formed on the polishing tape. To provide a polishing tape that does not have any problems.

"Means for Solving the Problem" The present invention is a polishing tape having a series of continuous polishing layers on the surface of a base material for polishing tape, and one end portion of which is fixed to a reel core. At least a part of the terminal portion on the side fixed to the reel core is composed of a polishing tape in which a terminal display layer having a thickness of 10 μ or less which is sensed by a sensor is formed so as to overlap the polishing layer.

The polishing tape of the present invention having the above-described structure has a series of polishing layers formed on the surface of the polishing tape substrate made of a synthetic resin film made of polyester or the like or synthetic paper.

This polishing layer can be obtained by applying a coating agent made of a resin solution in which abrasive particles made of inorganic fine powder having high hardness are dispersed in a resin solution and then dried.

In the polishing tape of the present invention, the base material for the polishing tape is
A resin film with a thickness of 12 to 150 μ, which has excellent properties in mechanical strength, dimensional stability, heat resistance, etc., for example,
Resin films made of polyethylene terephthalate, polypropylene, polycarbonate, di-acetate acetate, tri-acetate acetate, polyethylene, polybutylene terephthalate, polyarylate, etc. are preferably used.

The inorganic fine powder as abrasive particles includes the usual inorganic fine powder used for forming a polishing layer in this type of polishing tape, for example, aluminum oxide, silicon carbide, zirconium oxide, chromium oxide, iron oxide, diamond, An inorganic fine powder made of boron nitride, emery, cerium oxide, etc., having an average primary particle size of 0.1 to 60 μm is used.

As the binder resin for forming the polishing layer, for example, polyester resin, salt / vinyl acetate resin, polyurethane resin, butyral resin, polyamide resin, epoxy resin, acrylic resin, nitrified cotton, chlorinated rubber, etc. The mixed resin is used, and usually 100 to 1400 of inorganic fine powder which is abrasive particles with respect to 100 parts by weight of the resin for binder.
It is used in a ratio of about parts by weight.

As the coating agent for forming the polishing layer, for example, a solvent consisting of toluene, xylol, methyl ethyl ketone, methyl isobutyl ketone, anone, ethyl acetate, butyl acetate, etc. or a mixed solvent of two or more thereof is used.
The coating agent is usually prepared as an inorganic fine powder-dispersed resin liquid having a viscosity of about 10 to 10000 cps, and generally, a polishing layer having a thickness of about 3 to 100 μ is obtained, and used for the above-mentioned polishing tape. Applied to the substrate.

In addition to the above-mentioned inorganic fine powder which is the abrasive particles and the binder resin, for example, an additive such as a dispersant, an antistatic agent or a dye is appropriately blended in the inorganic fine powder-dispersed resin liquid for forming the polishing layer. For the purpose of improving the abrasion resistance, solvent resistance, heat resistance, etc. of the obtained polishing layer, and further improving the adhesion property between the polishing layer and the base material for the polishing tape. It is also possible to add an isocyanate-based curing agent.

In order to apply the dispersion resin liquid of the inorganic fine powder to the base material for the polishing tape, for example, roll coating with two rolls, three rolls, four rolls, etc., gravure coat, kiss coat, knife coat, bar coat , Rod coating, comma coating, spray coating, park coating and the like can be used, and particularly in the roll coating and gravure coating, both the direct method and the reverse method can be used.

Further, depending on the intended use of the obtained polishing tape, the polishing layer formed on the surface of the polishing tape base material may be subjected to post-treatment such as calendering.

The terminal display layer formed on at least a part of the terminal portion of the polishing tape on the side fixed to the reel core is for sensing by a sensor such as a pattern recognition sensor, a color discrimination sensor, a photoelectric switch, or the like. The terminal display layer is sensed by the sensor because the layer and the other portion have different light reflectance, color, magnetism, and the like, for example.

This terminal display layer is a normal printing ink layer by gravure printing, a magnetic ink layer, a spray coat layer, and further,
It is formed as a metal vapor deposition layer or the like.

The terminal display layer may be formed on the polishing sheet before being cut into the polishing tape, or may be formed after the slitting step of cutting the polishing sheet into the polishing tape and subsequently to the slitting step.

Further, the terminal display layer may be formed on the surface of the polishing layer, or may be formed on the surface of the base material for the polishing tape before the polishing layer is formed and the terminal display layer may be covered with the polishing layer.

When the thickness of the terminal display layer exceeds 10μ,
Even the last 5 to 6 layers of the polishing tape wound in a roll shape on the reel core are subject to embossing deformation due to the thickness of the terminal display layer, and this portion becomes unusable. Therefore, the terminal display layer is formed to have a thickness of 10 μm or less, more preferably 5 μm or less.

[Example] Hereinafter, a specific configuration of the polishing tape having an end mark of the present invention will be described with reference to manufacturing examples.

Example In FIG. 1, a coating agent for forming a polishing layer made of a resin liquid containing abrasive particles having a viscosity of 100 cps described below is formed on one entire surface of a base material 2 for an abrasive tape made of a polyethylene terephthalate film having a thickness of 50 μm. [A] is coated with 3 rolls by reverse roll coating, dried, and then 40
By subjecting it to aging treatment at 7 ° C. for 7 days, a polishing sheet having a polishing layer 3 with a thickness of 10 μ and exhibiting a white color due to aluminum oxide was obtained.

Coating agent for forming polishing layer [A] Fine aluminum oxide powder "Fujimi Abrasives Industry Co., Ltd .: WA"
# 10000 "is subjected to a drying treatment which consists of leaving it in a vacuum chamber (10 ^-4 Torr) at room temperature for 24 hours to remove the water content, and immediately after that, the abrasive particles 200 made of the dried aluminum oxide fine powder. By mixing 40 parts by weight of a polyester resin "Toyo Boshoku Co., Ltd .: Byron # 300", 60 parts by weight of toluene and 60 parts by weight of methyl ethyl ketone in a binder resin solution, a solid component is well dispersed in a sand mill. Let

Then, following the dispersion step, toluylene diisocyanate "Sumitomo Bayer KK: Sumidule F-80"
The equivalent ratio of the isocyanate group (-NCO) in the toluylene diisocyanate and the hydroxyl group (-OH) of the polyester resin in the obtained resin liquid, that is, (-
NCO) / (-OH) is 3 so that it is added to the above resin liquid, and subsequently diluted with an equal amount mixed solvent of toluene and methyl ethyl ketone to prepare an abrasive particle dispersion resin liquid having a viscosity of 100 cps, A coating agent [A] for forming a polishing layer was obtained.

After that, using a black paint, on the surface of the polishing layer at one end of the polishing sheet, width about 2.0mm, thickness 3.0
After forming the terminal display layer 4 having a fine stripe of μ, the polishing sheet is further cut into a tape having a width of 10 mm, which is an embodiment of the present invention indicated by reference numeral 1 in FIG. That is, the polishing tape 1 in which the terminal display layer 4 was formed to overlap with the polishing layer 3 on one terminal portion was obtained.

The end portion on which the terminal display layer 4 was formed was fixed to the reel core, and the polishing tape 1 was wound around the reel core to obtain a polishing tape having end marks wound in a roll shape.

[Operation and Effect of Device] The polishing tape having the end mark of the present invention has one end portion fixed to the reel core and wound in a roll, and moreover, the end portion on the side fixed to the reel core. At least 1 part, thickness of 10μ
The following terminal display layer is formed so as to overlap the polishing layer.

Thus, when the polishing tape having the end mark of the present invention having the above-described structure is automatically fed to perform the polishing operation, the end portion of the polishing tape which is automatically fed is detected. Can be automatically detected by the type of the terminal display layer in the polishing tape, for example, by a sensor such as a pattern recognition sensor, a color discrimination sensor, a photoelectric switch, etc. It is possible to fully automate the polishing process including the roll replacement of the polishing tape without the complexity of having to monitor the timing.

Further, since the polishing tape having the end mark of the present invention is formed with the terminal display layer having a thickness of 10 μm or less, the polishing tape wound in a roll shape on the reel core is
The terminal display layer formed on the polishing tape is not subjected to embossing deformation, and the terminal display layer does not cause waste.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a terminal portion of a polishing tape having an end mark of the present invention, which is fixed to a reel core. 1 ... Abrasive tape having end mark, 2 ... Abrasive tape substrate, 3 ... Abrasive layer, 4 ... Terminal display layer.

Claims (1)

[Scope of utility model registration request] 1. A polishing tape having a series of continuous polishing layers on the surface of a base material for a polishing tape, one end of which is fixed to a reel core, the side being fixed to the reel core. A polishing tape having an end mark, characterized in that a terminal display layer having a thickness of 10 μm or less which is sensed by a sensor is formed on at least a part of the terminal portion so as to overlap the polishing layer.