JPH02205465A - Method and device for polishing - Google Patents

Abstract

PURPOSE:To finish a belt-like material to be polished by polishing smoothly enough and to miniaturize the whole polishing device, by providing a polishing head sliding with the belt-like material, to be polished, travelling between a pair of turning rolls in a reciprocation manner, and hanging the belt-like polishing material on the support roll rotating this head. CONSTITUTION:A belt-like material 1 to be polished (belt-like magnetic recording medium) is wound out from one roll 2 and polished by a polishing head 4 while the belt-like material 1 is wound on the other roll 3. Moreover, after completion of the winding of the belt-like material 1 by the roll 3, the belt-like material 1 is moved back to the roll 2 from the roll 3 and this belt-like material 1 is polished by the polishing head 4. In this case, a belt-like polishing material (polishing tape) 42 is hung on the support roll 41 of the polishing head 4. Thus the belt like material 1 is reciprocated in several times between a pair of turning rolls 2, 3 like this and this belt-like material 1 is finish-polished smoothly at this time by the belt-like polishing material 42 of the polishing head 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polishing method and apparatus suitable for burnishing a magnetic recording medium.

[Conventional technology]

Sheet-like magnetic recording media such as audio tapes, magnetic tapes, and flexible disks have a basic structure consisting of a support 2 and a magnetic recording layer coated on the support, and the magnetic recording layer is generally made of a magnetic material. It is formed by applying a coating liquid containing particles and a binder onto a support, and then subjecting it to magnetic alignment treatment, drying treatment, etc. The smoothness of the surface of the magnetic recording layer formed in this way has a great influence on the electromagnetic conversion characteristics and the like of the resulting magnetic recording medium.

As mentioned above, the smoothness of the magnetic recording layer is generally improved by calendering the sheet-shaped magnetic recording medium. However, there is a limit to the smoothing achieved by this calendering process, and for magnetic recording media that require surface smoothness, it is necessary to perform an additional polishing process.

Conventionally, the polishing method described above includes punching a sheet magnetic recording medium into a disc shape, as seen in the polishing of flexible disks, etc.
The method used is to polish each sheet separately.
- Polishing each sheet has poor productivity, and cannot be applied to polishing magnetic recording media used in tape form, such as VTR tapes.

Therefore, recently, a method has been proposed in which a sheet-like magnetic recording medium is polished without being punched.

That is, for example, Japanese Patent Application Laid-Open Nos. 58-111131 and 60-151838 propose a method of polishing a magnetic recording medium by bringing an abrasive tape into sliding contact with the sheet-shaped magnetic recording medium. In addition to this, Japanese Patent Application Publication No. 1973
JP-A-82692 proposes a method of using a porous polishing member instead of a polishing tape,
No. 35 proposes a method of polishing magnetic recording media by bringing them into sliding contact.

[Problem to be solved by the invention]

However, in the above conventional polishing method using an abrasive tape, the method of ensuring the required contact length between the abrasive tape and the magnetic recording medium by reciprocating the abrasive tape at high speed is to use the abrasive tape reciprocatingly. In order to
Since abrasive tapes with different surface conditions are used during the forward movement and the backward movement, it is difficult to set conditions for obtaining a necessary and sufficient degree of polishing. Furthermore, with the method of swinging the abrasive tape in the running direction and perpendicular direction of the magnetic film, when trying to improve productivity, it is difficult to ensure a sufficient contact length between the web-like magnetic film and the abrasive tape. , productivity is low and sufficient surface smoothness cannot be obtained, and
If a plurality of polishing tapes are installed to obtain smoothness, there is a problem in that the device itself becomes large.

Therefore, the present applicant proposed a polishing method that can secure a sufficient contact length between a magnetic recording medium and an abrasive tape and maintain the surface of the abrasive tape in a constant state, according to Japanese Patent Application Laid-Open No. 63-278753, and its proposed a device.

Therefore, the object of the present invention is to
A further improvement of the polishing method and device described in Publication No. 3, that is, a polishing method and device that can sufficiently smooth a belt-shaped material to be polished such as a sheet-shaped magnetic recording medium and can also be made compact. It is about providing.

[Means to solve the problem]

The present invention unwinds a band-shaped material to be polished from one roll,
The unwound strip-shaped material to be polished is polished by a polishing head while being wound onto the other roll, and after the strip-shaped material to be polished is finished being wound on the other roll, the strip-shaped material to be polished is transferred from the other roll to the one roll. The above object is achieved by providing a polishing method characterized in that the belt-shaped material to be polished is moved back and forth, during which the belt-shaped material to be polished is polished in the same manner as the polishing described above, and such back-and-forth polishing is performed multiple times. This has been achieved.

Further, the present invention provides a device suitable for carrying out the above-mentioned polishing method, including one rotary roll for unwinding the belt-shaped material to be polished, and a rotating roll for winding the belt-shaped material to be polished unwound from the one rotary roll. a polishing head disposed between the pair of rotating rolls and slidingly contacting the band-shaped material to be polished that travels between the pair of rotating rolls; and rotating the polishing head. The present invention also provides a polishing device characterized by comprising a rotatable support roll and a band-shaped abrasive material placed on the support roll.

[Effect]

According to the present invention, the belt-shaped material to be polished is smoothly formed by the endless abrasive material of the polishing head while reciprocating between the pair of rotating rolls a plurality of times.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1. FIG. 1 is a perspective view showing the structure of an embodiment of a polishing apparatus of the present invention suitable for carrying out the method of the present invention.

First, a preferred embodiment of the apparatus for carrying out the method of the present invention will be described with reference to FIG.

The apparatus of this embodiment is applied, for example, to a strip-shaped magnetic recording medium as a strip-shaped material to be polished, and as shown in FIG. A pair of rotating rolls 2.3 and the pair of rotating rolls 2.
．． A polishing head 4 is disposed between the rotary rolls 2 and 3 and is in sliding contact with the strip-shaped magnetic recording medium 1 that runs between the rotary rolls 2 and 3 of the fit pair.
, a rotatable support roll 41 for rotating the polishing pad 4, and a band-shaped abrasive material (polishing tape) 42 hung on the support roll 41.

As is clear from FIG. 1, in the apparatus of this embodiment, a pair of polishing rads 4.4 are rotated vertically in opposite directions so as to polish both sides of the strip-shaped magnetic recording medium 1, respectively. It is arranged. An air knife 5.5 is disposed facing each support roll 41.41 constituting each polishing head 4, and the polishing is rotated by the support roll 41.41 in the opposite direction to the band-shaped magnetic recording medium 1. Tape 42.
The strip-shaped magnetic recording medium 1 is securely brought into sliding contact with the tape 42, so that the polishing action on both surfaces can be performed more reliably by the polishing tapes 42 and 42. The polishing tape 42 is wound into a roll and is discarded after polishing.

Further, on the back side of the polishing tape 42.42 rotated by the support rolls 41.41, that is, on the side that does not come into sliding contact with the strip-shaped magnetic recording medium l, the support rolls 41, 41
Cleaning rolls 43 and 43 are respectively disposed in contact with the polishing tapes 42 and 42 to remove dust that accompanies the band-shaped magnetic recording medium 1 when it is polished by the polishing tapes 42 and 42.

In addition, in the apparatus of this embodiment, between one rotary roll 2 and the polishing head 4, between the polishing head 4 and the polishing blade 4,
A guide roll 6 is disposed between each polishing pad 4 and the other polishing pad 3, and is configured to smoothly guide the strip-shaped magnetic recording medium 1 to each polishing pad 4.4. There is.

Next, an embodiment of the method of the present invention using the apparatus of the above embodiment will be described.

First, one end of the strip magnetic recording medium 1 disposed on one rotary roll 2 is unwound from the rotary roll 2, passed through a guide roll 6 and a polishing pad 4, and then one end is transferred to the other rotary roll 3. Then, when the device of this embodiment is driven, the strip-shaped magnetic recording medium 1 is unwound from one rotary roll 2, and the unwound strip-shaped magnetic recording medium 1 is wound onto the other rotary roll 3. In the meantime, both sides of the strip-shaped magnetic recording medium 1 are polished and smoothed using a polishing blade 4.4, and winding of the strip-shaped magnetic recording medium 1 is finished using the other rotary roll 3. The strip-shaped magnetic recording medium 1 is moved back from the rotary roll 3 to the one rotary roll 2, and polished in the same manner as described above, and this reciprocating polishing is completed.

Further, as described above, since the polishing tape 42 and the strip-shaped magnetic recording medium 1 run in opposite directions, the polishing efficiency of the strip-shaped magnetic recording medium 1 is high. That is, the surface condition of the abrasive tape 42 improves from the contact start point to the contact end point of the strip-shaped magnetic recording medium l, and at the contact end point, a new abrasive tape 4 is formed.
It is designed to come in contact with 2. Therefore, at the contact start point of the strip magnetic recording medium 1, the contact start point of the strip magnetic recording medium 1 is subjected to rough polishing by the abrasive tape 42 whose surface condition has deteriorated, and at the contact end point, the strip magnetic recording medium 1 surface is subjected to final polishing. smooth.

If sufficient smoothness cannot be obtained by the reciprocating polishing, the reciprocating polishing can be continuously repeated to obtain the desired smoothness.

According to this embodiment, the polishing tape 42 whose surface condition is always constant is brought into sliding contact with the strip-shaped magnetic recording medium 1 and polished back and forth, thereby increasing the contact length between the polishing tape 42 and the strip-shaped magnetic recording medium 1. can be set as necessary. Furthermore, even if dust generated during polishing or dust in the environment adheres to the back surface of the polishing tape 42, the cleaning roll 43
Since the dust is removed by this method, there is no possibility that the polishing action will be inhibited by the dust.

In this way, the strip-shaped magnetic recording medium 1 with both sides smoothed can be punched in the next step to obtain a magnetic disk having a desired degree of smoothness.

Furthermore, when polishing both sides of the strip-shaped magnetic recording medium I, the apparatus of this embodiment uses one polishing hood 4 for each as described above.
Both sides of the strip-shaped magnetic recording medium 1 can be sufficiently polished by simply providing the device, and the device itself is compact.

In the above embodiment, a method and an apparatus for smoothing both surfaces of the strip-shaped magnetic recording medium 1 by providing the polishing heads 4 at two locations have been described. If the polishing head is formed on only one surface, it is sufficient to provide the polishing head at only one location.

Further, in the above embodiment, only the case where the running direction of the polishing tape 42 is opposite to that of the strip-shaped magnetic recording medium 1 has been described, but the running direction may be the same as that of the strip-shaped magnetic recording medium 1. In this case, the strip magnetic recording medium 1 is in a new surface condition at the starting point of contact between the strip magnetic recording medium 1 and the polishing tape 42, and the polishing action deteriorates as the polishing by the polishing tape 42 progresses. The polishing efficiency is lower than when the polishing tape 42 runs in the opposite direction.

Furthermore, the present invention can be widely applied to belt-shaped materials to be polished other than belt-shaped magnetic recording media.

〔Effect of the invention〕

According to the present invention, it is possible to sufficiently smooth a belt-shaped material to be polished, such as a sheet-shaped magnetic recording medium, and the apparatus can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of an embodiment of a polishing apparatus of the present invention suitable for carrying out the method of the present invention. 1: Band-shaped magnetic recording medium (band-shaped polishing material) 2.3: Rotating roll 4: Polishing head 41: Support roll 42: Polishing tape (band-shaped polishing material)

Claims (2)

[Claims] (1) Unwinding the belt-shaped material to be polished from one roll, polishing the belt-shaped material to be polished with a polishing head while winding the unwound strip-shaped material to the other roll, and polishing the belt-shaped material to be polished by the other roll. After winding is completed, the strip-shaped material to be polished is moved back from the other roll to the one roll, and during this time, the strip-shaped material to be polished is polished in the same manner as the polishing described above, and such back-and-forth polishing is performed multiple times. A polishing method characterized by: (2) One rotating roll that unwinds the band-shaped material to be polished, the other rotating roll that winds up the band-shaped material that has been unwound from the one rotating roll, and the pair of rotating rolls. a polishing head disposed between the pair of rotating rolls that slides on the belt-shaped material to be polished, a rotatable support roll that rotates the polishing head, and a polishing belt applied to the support roll. A polishing device characterized by comprising: