JPH0340540Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a polishing tape used for polishing magnetic heads and the like. Here, the polishing tape is not limited to tape-shaped tapes, but also includes disk-shaped or sheet-shaped ones (polishing disks, polishing sheets), and these will be collectively referred to as "polishing tapes" hereinafter.

(Prior Art) For polishing magnetic heads such as video heads and audio heads, polishing tapes are used in which a polishing layer containing an abrasive is coated on one side of a flexible support. Polishing wheels are known as something similar to polishing tapes, but since polishing tapes use a flexible support, they are less durable than polishing wheels.
Particularly suitable for polishing curved surfaces. Furthermore, precision polishing is possible without damaging the surface to be polished. These advantages make abrasive tape indispensable in the final finishing of magnetic heads. In addition to tapes, disks are used for polishing heads for floppy disk drives and aluminum plates for hard disks, and sheets are used for polishing metal parts.

However, compared to the fact that polishing wheels can be used over and over again, conventional polishing tapes, which have a polishing layer on only one side of the support, must be discarded once used for polishing, which is very uneconomical. It was hot.

Generally, when polishing a magnetic head using this polishing tape, the polishing tape wound around a delivery roll is sent out at a predetermined speed, and the polishing layer of the delivered polishing tape is applied to the magnetic head to be polished. The abrasive tape is slid on the surface with a predetermined tape tension, and the abrasive tape after polishing is wound up with a take-up roll.

However, as mentioned above, once the polishing layer of the polishing tape has been used for polishing, it cannot be used again. Only one magnetic head can be polished by the traveling operation, which poses a problem in terms of time efficiency.

As a technology to solve these problems, we developed a polishing cloth (1973), which has polishing layers formed on both sides of a cloth support.
-113097 Publication) may be used.

According to this technology, by using two polishing layers on the front and back sides, it is possible to polish twice as much as when the polishing layer is provided on one side, so it is economical. It is thought that if the objects to be polished are arranged at different positions, two objects to be polished can be polished at the same time, and polishing time can be made more efficient.

(Problems to be Solved by the Invention) However, when polishing an object to be polished using a polishing tape, it is necessary to apply appropriate tension to the polishing tape depending on the shape of the object to be polished. especially,
When polishing a magnetic head, if an inappropriate tension is applied to the polishing tape, the polishing tape hits the magnetic head unevenly, making it impossible to polish the magnetic head with high precision.

Therefore, when polishing two magnetic heads of different sizes at the same time using the technique described in the above publication, it is not possible to set an appropriate tape tension for each magnetic head. Polishing cannot be performed with high precision.

The present invention was devised in view of the above-mentioned problems, and the purpose is to provide a highly efficient polishing tape that can simultaneously polish two different objects to be polished with high precision. .

(Means for Solving the Problems) The abrasive tape of the present invention has abrasive layers coated on both sides of a flexible support, and the flexible support is coated with an adhesive layer that can be easily peeled off. It is characterized by consisting of two support layers bonded together.

That is, this polishing tape can be made into two tapes by separating the two support layers with their adhesive layers.

Here, the term "easily peelable adhesive layer" means one having such adhesive strength that it can be peeled off at the user's discretion or used while bonded.

(Function) According to the above configuration, the support is formed by releasably joining two support layers with an adhesive layer.

Therefore, if the abrasive tape sent out from the delivery roll is separated into two tapes while running and wound up on each take-up roll, each separated tape can be slid onto a different object to be polished. Even when polishing is carried out, by adjusting the rotational torque of each take-up roll, it is possible to adjust the desired tape tension for each tape independently, making it possible to polish two objects at the same time with high precision. It becomes possible to do so.

In particular, when the objects to be polished are magnetic heads of different sizes, the contact of the polishing tape with each magnetic head is different, and therefore the optimum tape tension is usually different, but the magnetic tape of the present invention does not have this problem. Even in such cases, each magnetic head can be polished with high precision.

In addition, according to the above structure, by providing the polishing layer on both sides of the support, two polishing tapes can be stored in one take-up roll, saving cores, packaging materials, etc., and saving storage space. can be made smaller and the usage efficiency can be increased.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

FIG. 1A is a sectional view showing an abrasive tape according to an embodiment of the present invention. This abrasive tape has support layers 1A and 1 bonded with an easily peelable adhesive layer 3.
Polishing layers 2A and 2B are coated on the outer surfaces 1a and 1b of B, and as shown in FIG. 1B, the support layer is peeled off and the polishing layer 2A is coated on the support layer 1A. polishing layer 2 on top of the support layer 1B.
The tape coated with B can be separated into two parts.

As the material for the support layers 1A and 1B, for example, polyethylene terephthalate (PET) and polyethylene naphthalate are used.

The polishing layers 2A and 2B are formed by kneading polishing agents of the same material and size with a binder.

Next, a method of using this polishing tape will be explained using FIG. 2.

First, an example of use in which two support layers 1A and 1B are peeled off before use and two magnetic heads are polished at the same time will be described with reference to FIG.

That is, the polishing tape 4 sent out from the delivery roll 5A is supported by the guide roll 6,
In the middle, the two support layers 1A and 1B are peeled off to form single-sided polishing tapes 4a and 4b, and the magnetic heads 7 and 7, which are located on opposite sides of the tape running path, are simultaneously polished by the polishing layers 2A and 2B. Grind. Thereafter, the single-sided polishing tapes 4a, 4b are wound up on take-up rolls 5B, 5B as used tapes 4A, 4A. As a result, two magnetic heads 7, 7 are polished at once, and two magnetic heads 7, 7 are polished at a time.
This makes it possible to perform polishing at the same time.

By the way, when polishing a magnetic head, it is necessary to control the tension of the polishing tape so that the polishing layer of the polishing tape does not unevenly contact the surface of the magnetic head.

If the two magnetic heads 7, 7 are polished in the state shown in FIG. 2, the tension of each single-sided polishing tape 4a, 4b can be controlled independently by adjusting the rotational torque of each take-up roll 5B, 5B. be able to. In particular, even if the surface shapes of the two magnetic heads 7, 7 are different from each other and the appropriate tape tension is different from each other, the tension of each tape 4a, 4b can be controlled independently.
Polishing tapes 4a, 4 in each magnetic head 7, 7
It is possible to prevent uneven contact (b) and perform polishing with high precision.

Further, according to this polishing tape 4, the polishing layer 1
Since A and 1B are coated on both sides of the support, and one tape can be polished twice, packaging materials and winding cores can be saved, storage space is also reduced, and costs are naturally reduced.

The use of the polishing tape 4 of this embodiment is diversified, and as shown in FIG. 2, two magnetic heads 7, 7 can be polished at the same time.
After using one polishing layer 2A, the same magnetic head 7 can be polished in the next step using the other polishing layer 2B.

The method of use shown in FIG. 3 is an example in which the support layers 1A and 1B are polished while being bonded, and then these two support layers 1A and 1B are separated. The polishing tape 4 sent out from the delivery roll 5A polishes the magnetic head 7 with the polishing layer 2a, and then the two bonded support layers 1A and 1B are separated. Used tape 4A and unused tape 4
B is separately wound onto take-up rolls 5A and 5B, only the used tape 4A is discarded, and the unused tape 4B is used thereafter.

Further, the polishing tape 4 of this embodiment has two single-sided polishing tapes 4a and 4 as shown in FIGS. 2 and 3.
Of course, it is possible to use not only the case of separating into the front and back sides, but also the case of not separating the front and back sides as shown in FIGS. 4 and 5.

FIG. 4 is an example of how to use the polishing tape of this embodiment when the polishing layer is used on each side. The polishing tape 4 coated with the polishing layers 2A and 2B is delivered from the delivery roll 5A. Guide roll 6
, polish the magnetic head 7 with the polishing layer 2A, and place the used polishing layer 2A on the back side and the unused polishing layer 2B.
Wind it up on the take-up roll 5B so that the surface is facing up. The polishing layer 2B of the wound polishing tape 4 is as follows:
It can be used for subsequent polishing. FIG. 5 shows an example of use in which both sides of the polishing tape 4 are used at the same time. The polishing tape 4 sent out from the delivery roll 5A can simultaneously polish the magnetic heads 7, 7 of the same type with the polishing layers 2A, 2B, and is wound around the take-up roll 5B with both sides used. This makes it possible to obtain twice the polishing efficiency compared to the conventional method.

(Effects of the invention) According to the abrasive tape of the present invention, it is possible to separate the abrasive tape into two tapes during polishing and independently control the tension of each tape to match the appropriate tension of each object to be polished. Therefore, two objects to be polished can be simultaneously polished with high precision.

In addition, during manufacturing, storage, and transportation, the polishing tapes that function as two polishing tapes can be wound around a single core, increasing the efficiency of manufacturing, storage, and transportation, and reducing costs. It is possible to reduce the

[Brief explanation of the drawing]

1A and 1B are cross-sectional views of an abrasive tape according to an embodiment of the present invention, in which FIG. 1A shows the state before the support layer is peeled off, and FIG. 1B shows the state after the support layer is peeled off. 2 to 5 are schematic diagrams showing an example of a method of polishing a magnetic head using the polishing tape shown in FIG. 1A or FIG. 1B, respectively. 1...Support, 1A, 1B...Support layer, 2
A, 2B... Polishing layer, 3... Easily peelable adhesive layer, 4... Polishing tape, 4a, 4b... Single-sided polishing tape, 5A... Delivery roll, 5B... Winding roll, 6... ...Guide roll, 7...Magnetic head.

Claims (1)

[Scope of utility model registration request] 2 bonded via an easily peelable adhesive layer
1. An abrasive tape comprising a flexible support consisting of two support layers and two abrasive layers respectively coated on both sides of the support.