JPH07254143A - Magnetic recording medium manufacturing equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] Removal of foreign matter strongly adhered to the surface of a magnetic recording paper medium having a magnetic layer formed of a metal thin film,
An object is to provide an apparatus for manufacturing a magnetic recording medium compatible with high density recording. [Structure] A first plastic roller having a surface having a plastic deformation point lower than that of the magnetic recording medium and rotating while being pressed against the magnetic recording medium on a backup roller, and a surface having a plastic deformation point lower than that of the first plastic roller. A second plastic roller that rotates while being pressed against the first plastic roller. Further, it has the above-mentioned first plastic roller and a buffing member adapted to travel on the surface of the first plastic roller. [Effects] It is possible to manufacture a magnetic recording medium compatible with high-density recording, by removing foreign matter strongly adhered to the medium surface without damaging the medium, and removing the foreign matter on the contrary does not damage the medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a magnetic recording medium having a magnetic recording layer made of a metal thin film, which is used as a video tape, an audio tape or a computer tape.

[0002]

2. Description of the Related Art Recently, the field of magnetic recording has been toward higher performance such as higher image quality, smaller size, and longer time. Along with this, high density is required for magnetic recording media, so-called vapor-deposited tape having a magnetic layer formed by vacuum vapor deposition of metal has been developed and put into practical use as a magnetic tape for audio and video. ing. However, as the recording density becomes higher, the demands on the surface defects of the magnetic recording medium become stricter. An apparatus for removing surface defects of these magnetic recording media is disclosed in JP-A-62-199347,
Japanese Unexamined Patent Publication No. 1-258225 discloses an apparatus for treating the surface of a magnetic recording medium with a polishing tape or a nonwoven fabric.

[0003]

The surface defects of the magnetic recording medium include suspended dust, powder falling from the edge of the medium, and particulate foreign matter generated by bumping of the magnetic material evaporation source in the magnetic layer forming step, so-called splash. There is adhered foreign matter such as.

In a conventional apparatus for treating the surface of a magnetic recording medium, if the medium surface is treated with a material having a small polishing force such as a non-woven fabric, among the above-mentioned surface defects, the surface of the medium such as floating dust or powder falling from the end face is simply The removing effect is great for the adhering foreign matter, but the removing effect is small for the foreign matter firmly adhering to the medium surface such as splash. Further, when the surface of the medium is treated with a polishing tape, since the polishing power is large, the effect of removing foreign matters such as splash is also large, but scratches occur on the normal part of the magnetic layer surface, making it unpractical, and also scratching. There was a problem that only a certain limit of removal effect could be realized if it was suppressed.

The present invention is intended to solve the above problems, and an object of the present invention is to provide an apparatus for manufacturing a magnetic recording medium adapted for high-density recording by removing foreign matter firmly attached to the surface of the magnetic recording medium such as splash. .

[0006]

In order to solve the above problems, a magnetic recording medium manufacturing apparatus of the present invention is a magnetic recording medium manufacturing apparatus in which a magnetic layer made of a metal thin film is formed on a non-magnetic support. Therefore, the first plastic roller having a surface having a plastic deformation point lower than that of the magnetic recording medium is rotated while being pressed against the magnetic recording medium on the backup roller, and is more plastic than the first plastic roller. A device in which a second plastic roller having a surface with a low deformation point is adapted to rotate while being in pressure contact with the first plastic roller. Further, the first plastic roller having a surface having a plastic deformation point lower than that of the magnetic recording medium is rotated while being pressed against the magnetic recording medium on the backup roller, and the buffing member is the first plastic roller. It is a device designed to travel in contact with.

Incidentally, the comparison of the plastic deformation points is made by sandwiching the fine particle metal between the respective films and observing in which sample the fine particle metal is embedded when the load is gradually applied from above. You can do it.

[0008]

When the first plastic roller, which has a plastic deformation point lower than that of the magnetic recording medium, is pressed against the surface of the magnetic recording medium on the backup roller, some foreign matter such as splash is embedded in the surface of the first plastic roller. By transferring and rotating the roller, foreign matter on the surface of the medium can be continuously removed. The transferred foreign matter is pressed every time the plastic roller makes one rotation and comes over the backup roller, and gradually gets deeply embedded in the plastic roller. However, the fact that the transferred foreign matter is pressed means that the magnetic recording medium between them is pressed by the transferred foreign matter, which, conversely, causes defects of irregularities on the magnetic recording medium at the cycle of the circumference of the plastic roller. Will make Therefore, by providing the second plastic roller that rotates while being pressed against the first plastic roller and has a plastic deformation point lower than that of the first plastic roller, the recording medium can be rotated during one rotation of the first plastic roller. It is possible to eliminate the above-mentioned adverse effects by re-transferring the transferred foreign matter from the second plastic roller.

Further, by providing a buffing member such as a non-woven fabric, a cotton cloth, a felt, a sisal linen, etc., which is adapted to run in contact with the surface of the first plastic roller, the buffing against the transferred foreign matter protruding from the surface of the plastic roller is performed. Abrasive foreign matter is scraped off by lateral pressure due to contact travel of the polishing member and plastic deformation of the plastic roller surface,
Similarly, a magnetic recording medium compatible with high-density recording can be manufactured by eliminating the above-mentioned adverse effects. If a buffing abrasive tape is used instead of the buffing abrasive member, the transferred foreign matter can be removed in the same manner as above, but the polishing power is large, so the surface of the plastic roller is damaged,
The shavings transfer to the magnetic recording medium and conversely increase surface defects.

[0010]

EXAMPLES Examples of the present invention will be described in detail below.

FIG. 3 is an enlarged sectional view of the magnetic tape stock used in the embodiment of the present invention. Thickness is 10 μm and width is 20
Co-Ni (Ni: 15 wt%) is applied to one surface of the non-magnetic support 14 made of a 0 mm polyethylene terephthalate film in an amount of 4 to 7 × 10 ⁻⁵ Torr of about 0.2 μm.
To form a magnetic layer 15. The following was performed using this original fabric.

(Embodiment 1) FIG. 1 shows a schematic configuration diagram of an embodiment of a magnetic recording medium manufacturing apparatus of the present invention. The raw fabric 1 is fed from the feeding roll 2, travels with the roller 3, the metal backup roller 4, and the roller 5 at a speed of 20 m / min, and is wound by the winding roll 6. Raw 1 at this time
On the backup roller 4, a rubber roller having a diameter of 85 mm is pressed by a pressure of 1 kg against a first plastic roller 7 in which a Teflon tube having a thickness of 500 μm is covered. Furthermore, the first plastic roller 7 has a diameter of 8
A second plastic roller 8 in which a 5 mm rubber roller is covered with a polyethylene tube and a polypropylene tube having a thickness of 500 μm is pressed with a pressure of 1 kg. Each roller rotates in synchronization with the original 1.

As shown in FIG. 3, the raw material which has been subjected to the above-mentioned treatment is provided on the surface of the non-magnetic support 14 opposite to the magnetic layer 15,
Carbon black dispersed in binder resin to a thickness of 0.
The back coat layer 16 having a thickness of 5 μm is formed, and the magnetic layer 1 is further formed.
Fluorine-based lubricant was applied on the surface of No. 5 under the condition of 10 mg / m ² to form a lubricating layer 17. After that, this raw fabric was slit to a width of 8 mm to prepare evaluation tapes 1 and 2.

(Embodiment 2) FIG. 2 is a schematic structural diagram of another embodiment of the magnetic recording medium manufacturing apparatus of the present invention. The same numbers as in FIG. 1 represent the same members.

The cotton 10 fed from the feeding roll 9
The buffing member 10 made of 0% non-woven fabric is the roller 11,
The first plastic roller 7 and the roller 12 travel at a speed of 50 mm / min in the direction opposite to the rotation direction of the first plastic roller 7, and are wound by the winding roll 13. At this time, the wrap angle of the buffing member 10 to the first plastic roller 7 was 60 degrees. Further, only the traveling direction of the buffing member 10 was reversed to the above, and the same operation was performed.

Thereafter, in the same manner as in Example 1, evaluation tapes 3 and 4 were prepared. (Comparative example) Untreated raw fabric surface, raw fabric surface treated with 100% cotton non-woven fabric, raw fabric surface treated with abrasive tape, only the first plastic roller in Figure 1 was used The comparative tapes 5, 6, 7, and 8 were prepared in the same manner as in Example 1 by treating the above-mentioned processed materials.

These tapes were evaluated for the following items. The results are shown in (Table 1).

(1) Number of adhering foreign matters After recording a signal on a video deck of 8 mm, a recording pattern is developed with magnetic metal fine particles. The surface of the developing tape having a length of 10 minutes was observed with an optical microscope to check the number of foreign matters attached to the signal missing portion.

(2) Surface observation 1 Observation of defects caused by adhering foreign matter removed from the medium surface by transferring the shape to the medium surface with an optical microscope and confirming that there is no defect or even if there is no problem in practical use. Was evaluated as ◯, and those that are practically problematic were evaluated as x.

(3) Surface Observation 2 The surface of the tape is observed with an optical microscope to examine the scratches on the surface of the magnetic layer. If there is no scratch or there is practically no problem, the mark is ○, and there is a problem in practical use. Was evaluated as x.

[0021]

[Table 1]

As described above, in the magnetic recording medium manufactured by the manufacturing apparatus of the present invention, surface defects can be suppressed without damaging the medium surface.

In the embodiment of the present invention, the foreign matter adhering to the surface of the magnetic layer of the magnetic recording medium was removed, but it goes without saying that the opposite surface of the medium can be treated in the same manner.

[0024]

EFFECTS OF THE INVENTION Magnetic particles suitable for high-density recording can be obtained by removing adhering foreign matter such as splash strongly adhered to the medium surface without damaging the medium, and removing the adhering foreign matter conversely without damaging the medium. An apparatus for manufacturing a medium can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a magnetic recording medium manufacturing apparatus of the present invention.

FIG. 2 is a schematic configuration diagram of another embodiment of the magnetic recording medium manufacturing apparatus of the present invention.

FIG. 3 is an enlarged cross-sectional view of a magnetic tape stock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw fabric 2 Feeding roll 3,5 Roller 4 Backup roller 6 Winding roll 7 First plastic roller 8 Second plastic roller 9 Feeding roll 10 Buff polishing member 11, 12 Roller 13 Winding roll 14 Non-magnetic support 15 Magnetic layer 16 Back coat layer 17 Lubricating layer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhide Ataka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Hideyuki Mikan 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Within

Claims (2)

[Claims] 1. A manufacturing apparatus for a magnetic recording medium, wherein a magnetic layer made of a metal thin film is formed on a non-magnetic support, and has a surface having a plastic deformation point lower than that of the magnetic recording medium, and the magnetic recording medium on a backup roller. Magnetic recording having a first plastic roller that rotates while being pressed against the first plastic roller, and a second plastic roller that has a surface with a plastic deformation point lower than that of the first plastic roller and that rotates while being pressed against the first plastic roller Media manufacturing equipment. 2. A magnetic recording medium manufacturing apparatus comprising a magnetic layer made of a metal thin film formed on a non-magnetic support, the magnetic recording medium having a surface having a plastic deformation point lower than that of the magnetic recording medium, and the magnetic recording medium on a backup roller. An apparatus for manufacturing a magnetic recording medium, comprising: a first plastic roller that rotates while being pressed against the surface of the first plastic roller; and a buffing member that travels in contact with the surface of the first plastic roller.