JPH01246074A - Polishing device for magnetic recording medium - Google Patents

Abstract

PURPOSE:To always efficiently remove polishing chips from the surface of a polishing roll and to polish a magnetic record medium excellently without scratching the magnetic record medium to be polished by providing a polishing device with a cleaning brush rotating being in contact with the polishing roll. CONSTITUTION:The magnetic surface of a magnetic recording tape 1 running in the direction of an arrow B is polished and the protrusion and deposits of the surface are removed with a polishing roll 4 rotating in the direction of an arrow C. Although at this moment some of the polishing chips of the recording tape 1 are stuck to the surface of the polishing roll 4, these polishing chips are removed by a cleaning brush 6 rotating in the direction of an arrow D from the surface of the polishing roll 4. Therefore, the polishing roll 4 can always maintain the surface thereof cleaned, and the magnetic recording tape 1 can be excellently polished without being scratched.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a magnetic recording medium polishing device for polishing the surface of a magnetic recording medium using a polishing roll, and more particularly, the present invention relates to a magnetic recording medium polishing device that polishes the surface of a magnetic recording medium using a polishing roll, and more particularly, the present invention relates to a magnetic recording medium polishing device that polishes the surface of a magnetic recording medium using a polishing roll. The present invention relates to a recording medium polishing device.

(Prior Art) As is well known, magnetic recording media in which a magnetic layer is formed on a non-magnetic support are used in audio and video.

Widely used for computers, etc.

The above magnetic recording medium is usually made of ferromagnetic powder, a binder, a lubricant, etc. on a non-magnetic support such as polyethylene terephthalate.
The above-mentioned magnetic layer is formed by applying a magnetic paint made of non-magnetic powder, organic solvent, etc. After forming the magnetic layer, the magnetic layer is subjected to magnetic field orientation treatment, drying treatment, calendering treatment, etc. to obtain the desired shape. Manufactured by cutting into shapes.

By the way, on the surface of the magnetic layer of the magnetic recording medium manufactured as described above, some of the granular components in the magnetic layer may rise to form protrusions, and such protrusions and If the smoothness of the magnetic layer is impaired by dust or the like adhering to the magnetic layer, it becomes impossible to obtain a good head touch, which causes dropouts.

Therefore, in order to remove the protrusions on the surface of the magnetic layer, the present applicant conveyed a web-shaped magnetic recording medium in a fixed direction and brought it into contact with a cylindrical polishing roll having minute protrusions on the circumferential surface. We have already proposed a method of cutting and polishing the protrusions and deposits on the surface of the magnetic layer by rotating the magnetic recording medium in the opposite direction to the conveyance direction of the magnetic recording medium (Japanese Patent Application No. 7759/1983).
No. 8, No. 82-172532, etc.). It is preferable that such polishing treatment is carried out after drying the magnetic recording medium and before calendering.Doing so will avoid the inconvenience of dust etc. adhering to the calender rolls, which will impair the good calendering effect. does not occur.

(Problem to be Solved by the Invention) However, in the above polishing method, if polishing is performed for a long time, polishing debris will adhere to the polishing roll itself, which will reduce the polishing effect and will also cause debris to adhere to the polishing roll. There is an inconvenience in that the polished debris damages the surface of the magnetic layer and causes dropouts.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a magnetic recording medium polishing device that can polish a magnetic recording medium satisfactorily over a long period of time using a rotating polishing roll. It is something to do.

(Means for Solving the Problems) A polishing device for a magnetic recording medium of the present invention includes a cleaning brush that rotates in contact with the polishing roll described above to remove polishing debris attached to the surface of the polishing roll, and A belt-shaped cleaning material made of nonwoven fabric or the like is brought into contact with the polishing roll while being conveyed and collects polishing debris on the surface of the polishing roll, and the cleaning material attached to the cleaning brush and the polishing debris on the polishing roll are suction-collected. The invention is characterized in that it is equipped with a vacuum means for collecting the water.

The vacuum means may be of any type as long as it can efficiently absorb the abrasive debris on the roll and the abrasive debris attached to the cleaning brush. Since it is desirable to remove the cleaning brush, it is desirable that the brush be disposed so as to cover the cleaning brush.

(Function) According to the apparatus of the present invention, since the polishing dust adhering to the polishing roll is removed by the cleaning brush, there is no risk that the surface of the magnetic recording medium will be scratched by the polishing dust, and the polishing dust adhering to the cleaning brush is eliminated. Since the polished debris is removed by suction by the vacuum means, the cleaning of the polishing roll by the cleaning brush can be performed permanently and satisfactorily. Furthermore, according to the apparatus of the present invention, the abrasive debris is effectively removed by the long cleaning material, and since this cleaning material is conveyed in a fixed direction, a fresh surface always comes into contact with the polishing roll, resulting in a cleaning effect. is always kept constant and good. Therefore, according to this device, the cleaning effect of the cleaning brush and the cleaning material described above can be combined, and extremely good cleaning can be achieved.

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

FIG. 1 is a schematic side view of a magnetic recording medium polishing apparatus according to an embodiment of the present invention.

A web-shaped magnetic recording tape 1 having a width of about 500 to 11,000 mm, as an example of a magnetic layer formed on a non-magnetic support, is wound around a take-up roll 2 rotating in the direction of arrow A, and then rolled onto a delivery roll. 3 to too ~1000
It is sent out in the direction of arrow B at a speed of m/m1n. At the position where it comes into contact with the magnetic recording tape running in the direction of arrow B,
A cylindrical polishing roll 4 rotating in the direction of arrow C is arranged, and the surface of the magnetic recording tape 1 is polished by this polishing roll 4. In addition, magnetic recording tape 1
The magnetic surface is in contact with the polishing roll 4. Further, the polishing apparatus of the present invention may be an independent polishing apparatus, or the above-mentioned delivery roll 3 and polishing roll 4 may be independent.
It can be incorporated into a magnetic recording tape manufacturing apparatus by providing a magnetic layer coating section and a drying section between the polishing roll 4 and the winding roll 2, or by providing a part of a calender between the polishing roll 4 and the winding roll 2. Good too.

The polishing roll 4 has no organic binder such as metal powder or thermosetting resin on the circumferential surface of the cylindrical roll, or an organic binder such as glass or ceramic. With quality binders,
Alternatively, it is a cylindrical grinding tool made of diamond particles solidified by electroplating, or a ceramic cylindrical grinder made of zirconia, silicon carbide, silicon nitride, alumina, etc., at a speed corresponding to the running speed of the magnetic recording tape 1. Preferably, the magnetic recording tape is rotated in a direction opposite to that of the magnetic recording tape as shown. The rotational speed of the polishing roll is preferably such that the air film generated between the polishing roll and the magnetic recording tape due to the wedge film effect in fluid lubrication theory can be reduced to almost zero. is desirably changed in accordance with the running speed of the magnetic recording tape.

Further, a cleaning brush 5 for cleaning the polishing roll is brought into contact with the polishing roll 4. This cleaning brush 5 is moved in the direction of the arrow, which is opposite to the rotation of the polishing roll 4, for example, from 10 to 3007 FL/i1.
It is a roll-shaped member that rotates at a rotation speed of 100 mm, and is made of plastic resins such as nylon and polypropylene, animal fibers such as wool, horse hair, and pig hair, vegetable fibers such as tampico and palm, and steel wire. , iron wire, brass wire,
The brush portion is made of a steel material such as stainless steel wire or piano wire. Note that the peripheral speed of the cleaning brush 5 is preferably approximately 1/2 to 2 times the peripheral speed of the polishing roll 4.

In addition, near the contact area between the polishing roll 4 and the cleaning brush 5, air is sucked in the direction of the arrow in FIG. Vacuum means 7 are arranged.

It is desirable that the suction pressure and suction flow rate of this vacuum means be large, but in consideration of cost and space, about 700 m/mAq and 2.4 m3/sin, respectively, are sufficient.

In the above-described apparatus, the magnetic recording tape 1 traveling in the direction of arrow B has its magnetic surface polished by a polishing roll 4 rotating in the direction of arrow C to remove protrusions and deposits on the surface. A part of the polishing layer of the magnetic recording tape adheres to the surface of the polishing roll 4, but this polishing layer is removed from the polishing roll surface by the cleaning brush 5. Therefore, the polishing roll 4 always keeps the magnetic recording tape l on the surface of the cleaning agent.
The magnetic recording tape can be satisfactorily polished without damaging the magnetic recording tape due to the polishing layer. Further, since the cleaning brush 5 and the polishing layer 8 on the polishing roll 4 are sucked by the vacuum means 7, the cleaning effect of the cleaning brush 5 on the polishing roll 4 is permanently maintained.

Next, a second polishing apparatus according to the present invention will be explained with reference to FIG. Note that the same parts as those in the apparatus shown in FIG. 1 are given the same numbers, and the explanation thereof will be omitted.

The illustrated apparatus cleans the polishing roll 4 using a belt-shaped cleaning material 1O instead of the cleaning brush and vacuum means described above. The cleaning material lO is carried out by a take-up roll 11 rotating in the direction of arrow F.
By winding it up, it is sequentially pulled out from the delivery roll 12, and the press travels in the direction of the arrow E, which is opposite to the polishing roll 4, while being brought into surface contact with the polishing roll 4 by the roll 13.

The wrap angle of the cleaning material 1o with respect to the polishing roll 4 is preferably 0 to 30@, and the cleaning material may be fed continuously or intermittently, but the feeding speed is 10 to 250 m/win (cost Considering both the dust removal effect and the dust removal effect, it is desirable to
in ) range. Moreover, the feeding direction may be the direction opposite to the polishing roll as described above,
They may be in the same direction. Further, as an example of the cleaning material, a non-woven fabric is suitable, and examples of the non-woven fabric include those composed of fibers mainly composed of polyester, those mainly composed of rayon, and those composed of fibers mainly composed of nylon. These fibers may be bound together with a binder, and nylon/rayon, rayon/polypropylene, polyacrylonitrile/
It may be a non-woven fabric made of acrylic ester constituent fibers embossed with no binder, or a non-woven fabric made of binder-free fibers such as 100% cellulose. Further, the cleaning material is not limited to non-woven fabrics, and includes, for example, paper, felt, polytex, Japanese paper, sponge, and wiping fabric.

It may be made of fiber, lace, cloth, etc.

In such an apparatus, polishing debris adhering to the surface of the polishing roll 4 is collected and removed by the cleaning material, and the cleaning material 10 travels in the direction of arrow E and always comes into contact with the polishing roll 4 with a new surface. A good leaning effect can be obtained over a long period of time.

Furthermore, FIG. 3 shows an apparatus including the cleaning brush 5 and vacuum means 7 described above, as well as the cleaning material 10. In the illustrated apparatus, the polishing roll 4 is first cleaned by the cleaning brush 5 described above, and further, by contacting the cleaning material IO, polishing debris that could not be completely removed by the cleaning flange 5 is removed. Cleaning is performed more effectively.

Further, FIG. 4 shows a device shown in FIG. 3 in which the vacuum means 7 is arranged to cover the cleaning brush 5. In this way, the removal of abrasive debris from the cleaning brush 5 can be made more effective. can be done.

Furthermore, FIG. 5 shows an apparatus in which the above-mentioned cleaning brush 5 and cleaning material 10 are both covered by a vacuum means 7. Such a device can remove polishing debris very effectively, but the cleaning brush (
It is desirable to provide a partition plate 14 between the two members to prevent polishing debris sucked from the cleaning material (cleaning material) from adhering to the cleaning material (cleaning brush).

Further, the magnetic recording medium to be polished in the apparatus of the present invention is not limited to the above-mentioned magnetic recording tape, but may also be a disc-shaped magnetic disk 1' as shown in FIG. In this case, the length of the polishing roll 4 is made longer than the radius of the magnetic disk 1', and the polishing roll 4 is positioned in the radial direction of the magnetic disk 1' and brought into contact with the disk. It is sufficient to rotate the polishing roll in the direction of the arrow B' and the polishing roll in the direction of the force of the arrow C'.

More specific examples of the present invention will be shown below along with comparative examples.

(Example 1) In the apparatus shown in FIG.
RaO,Bum cutoff 0.251W in the direction opposite to the running direction of this magnetic recording tape.

Ra+ax 8. Ott TrL cutoff 0.2
Polishing was carried out by rotating a metal diamond polishing roll with a diameter of 5 m and 50 shoes at 709 rpm and contacting it with a wrap angle of 5''. At the same time, a cleaning brush made of polypropylene was applied to the polishing roll at a circumferential speed. Contact with the polishing roll while rotating at a constant speed in the direction opposite to the rotation of the polishing roll at 200 TrL/win, and further, the suction pressure is 700 #1llIAq - the suction flow rate is 2-4 FI
Polishing debris adhering to the polishing roll and cleaning brush was collected using a vacuum means of L3/m1n.

(Example 2) In the apparatus shown in Fig. 2, the conditions of the magnetic recording tape and the polishing roll were the same as in Example 1 above, and the tension on the polishing roll was about 2 kg, the feeding speed was 10 m/sin, and the polishing roll was reversely rotated. The cleaning material traveling in the direction is wrapped at an angle l
Cleaning was performed by contacting at 0°. A nonwoven fabric (#4000, manufactured by Nippon Vilene Co., Ltd.) made of polyester/nylon fibers bound with a silicone resin binder was used as the cleaning material.

(Example 3) In Example 2, cleaning was performed by changing the cleaning material to CrO2-based #8000 wrapping tape manufactured by Fuji Photo Film Co., Ltd.

(Example 4) In the apparatus shown in FIG. 3, a magnetic recording tape.

The conditions for the polishing roll, cleaning brush, and vacuum means were the same as in Example 1, and the cleaning material was a nonwoven fabric made of the same material as in Example 2.
Cleaning was performed by contacting the polishing roll at a wrap angle of 106 while traveling in the opposite direction to the polishing roll at a feed rate of 20 am/l1 inch.

(Example 5) In the apparatus shown in FIG. 4, a magnetic recording tape.

The conditions of the polishing roll, cleaning brush, and cleaning material were the same as in Example 4, and the suction pressure cuff was 00 a*A.
Q, the cleaning brush was covered by a vacuum means with a suction flow rate of 2.4 m3/msn.

(Comparative Example 1) The cleaning brush and vacuum means were removed from the apparatus shown in FIG. 1, and polishing was carried out under the same conditions as in Example 1 for the magnetic recording tape and polishing roll.

After cutting the magnetic recording tapes polished according to Examples 1 to 5 and Comparative Example 1 to a width of 172 inches,
The number of dropouts and number of scratches were measured. The results are shown in Table 1. The definition of dropout is -20
The output was down by dB or more and the length was 15 μs or more, and the number of occurrences in one minute was measured. Regarding scratches, the number of scratches that could be visually confirmed per unit length (171Z) was counted. The deck used was AG-6200 manufactured by Kenko Denki Co., Ltd., and the dropout measuring device was JVC Dell VD-3M.

Table 1 As is clear from the above results, in Examples 1 to 5 using the apparatus of the present invention, polishing was performed well, with fewer dropouts and no scratches than in the comparative example. It was confirmed that

The apparatus of the present invention may also be used to polish magnetic recording tapes that have been slit to a product width (for example, 172 inches). Examples in which polishing is performed in the above steps will be shown below along with comparative examples.

(Example 6) In the apparatus shown in FIG.
The magnetic recording tape was run at 0 g, and a polishing roll made of the same material and diameter as in Example 2 was placed 23 times in the opposite direction to the running direction of the magnetic recording tape.
Polishing was carried out by contacting the polishing roll with a wrap angle of 5" while rotating at 0 rpm. At the same time, a polishing roll made of the same material as in Example 2 was made of a non-woven fabric, and was moved against the polishing roll at a tension of 50 g and a feed rate of ioam/sin. The polishing roll was cleaned by contacting the polishing material with a cleaning material traveling in the same direction at a wrap angle of 10°.

(Example 7) In Example 6 above, cleaning was performed by changing the cleaning material to Crag series #8000 wrapping tape manufactured by Fuji Photo Film Co., Ltd.

(Comparative Example 2) The cleaning material was removed from the apparatus shown in FIG. 2, and polishing was carried out under the same conditions as in Example 6 for the magnetic recording tape and polishing roll.

The number of dropouts and the number of scratches on the magnetic recording tapes polished in Examples 6 and 7 and Comparative Example 2 were measured. The results are shown in Table 2.

The definitions of dropout and abrasion, the deck used, and the dropout measuring device are the same as in Table 1.

Table 2 As is clear from the above results, it was confirmed that the apparatus of the present invention can perform good polishing even on the magnetic recording tape after slitting.

(Effects of the Invention) As described above in detail, the magnetic recording medium polishing apparatus of the present invention provides a cleaning brush.

By providing a means for cleaning the polishing roll, such as a cleaning material, polishing debris can be constantly and effectively removed from the surface of the polishing roll, and polishing can be performed successfully without damaging the magnetic recording medium. .

[Brief explanation of the drawing]

1, 2, 3, 4, and 5 are schematic side views of a magnetic recording medium polishing apparatus according to an embodiment of the present invention, respectively, and FIG. 6 is a schematic side view of a polishing apparatus for a magnetic recording medium according to an embodiment of the present invention. 1 is a perspective view of a polishing apparatus according to an example; FIG. 1...Magnetic recording tape 1'...Magnetic disk 4.
・・Polishing roll 5・・Cleaning brush 7・
...Bakinim means 8...Abrasive waste IO...Cleaning material Fig. 1 Fig. 2 Fig. 5 ↓ Fig. 6

Claims (1)

[Scope of Claims] A polishing apparatus for a magnetic recording medium that polishes the surface of a magnetic recording medium by bringing a rotating polishing roll into contact with the surface, comprising: rotating while in contact with the polishing roll to polish the surface of the polishing roll; a cleaning brush for removing adhering abrasive debris; a vacuum means for suctioning and collecting the abrasive debris adhering to the cleaning brush and abrasive debris on the polishing roll; A polishing device for a magnetic recording medium, comprising: a belt-shaped cleaning material that collects the polishing debris on the surface of the polishing roll.