JPH0222448B2 - - Google Patents
Info
- Publication number
- JPH0222448B2 JPH0222448B2 JP23973783A JP23973783A JPH0222448B2 JP H0222448 B2 JPH0222448 B2 JP H0222448B2 JP 23973783 A JP23973783 A JP 23973783A JP 23973783 A JP23973783 A JP 23973783A JP H0222448 B2 JPH0222448 B2 JP H0222448B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- orientation
- magnetic field
- magnet
- hot air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 239000003973 paint Substances 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000006249 magnetic particle Substances 0.000 claims description 2
- 239000006247 magnetic powder Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は磁気デイスクの製造方法に係り、特に
磁気デイスクの大幅な生産性向上に好適な磁気デ
イスクの磁場配向方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method for manufacturing a magnetic disk, and particularly to a method for magnetic field orientation of a magnetic disk suitable for greatly improving productivity of magnetic disks.
第１図は従来の方法を示す図である。磁性塗料
を塗布した塗布デイスク１をスピンドル２によつ
て10〜60RPMで矢印３の方向に回転しながら磁
石４によつて磁場を印加することにより塗料中の
磁性粉を円周方向に配向する。印加60秒後にフア
ン６が回転し、チヤンバ７内の空気を矢印１７方
向に吹きつけ、塗膜が乾燥するまで（180秒程度）
送風して配向が完了する。
FIG. 1 is a diagram showing a conventional method. A coating disc 1 coated with magnetic paint is rotated by a spindle 2 at 10 to 60 RPM in the direction of arrow 3, and a magnetic field is applied by a magnet 4 to orient the magnetic powder in the paint in the circumferential direction. After 60 seconds of application, fan 6 rotates and blows the air inside chamber 7 in the direction of arrow 17 until the paint film dries (about 180 seconds).
Blow air to complete orientation.
従来の配向方法はチヤンバ内の空気を小型フア
ンによつてデイスク面に垂直に送風していたた
め、塗料が乾燥するまで約３分かかり生産上の大
きな障害となつていた。またチヤンバ内の空気の
温度によつて乾燥時間が変わるため未乾燥で配向
性のよくないデイスクを作ることもあつた。さら
にはスピンコート法においては塗布膜の厚さが内
周で薄く、外周で厚い性質があるため、乾燥しに
くい外周側に合わせて配向時間を設定すると内周
側で磁場が必要以上にかかり過ぎて磁性粉どおし
が微集して塗膜に穴があいたような状態になるい
わゆる磁場アレを起こす欠点があつた。 In the conventional orientation method, the air inside the chamber was blown perpendicularly to the disk surface using a small fan, which took about 3 minutes for the paint to dry, which was a major hindrance to production. Furthermore, since the drying time varied depending on the temperature of the air in the chamber, disks that were not dried and had poor orientation were sometimes produced. Furthermore, in the spin coating method, the thickness of the coating film is thinner on the inner periphery and thicker on the outer periphery, so if the orientation time is set to match the outer periphery, which is difficult to dry, the magnetic field will be applied too much on the inner periphery. This had the drawback of causing so-called magnetic field irregularities, where magnetic particles would collect in fine particles and cause holes in the paint film.
本発明の目的は塗布膜の品質を落とすことなく
短時間に磁場配向を終了させる生産性のよい磁気
デイスクの製造方法を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a highly productive method for manufacturing magnetic disks that can complete magnetic field orientation in a short time without degrading the quality of the coated film.
増産化が進む磁気デイスクにおいて、製造工程
のサイクルタイム短縮は必須のものである。例え
ば塗布工程においては両面同時に多孔ノズルで塗
布する方法などが実施されて効果を上げている。
配向工程においても磁石を増やすことで磁石印加
時間は短縮できるが、その後、配向がくずれない
うちに素早く乾燥させる方法を見出すことが配向
工程のサイクルタイム短縮の課題となつていた。
As production of magnetic disks continues to increase, shortening the cycle time of the manufacturing process is essential. For example, in the coating process, a method of coating both sides at the same time using a multi-hole nozzle has been implemented to great effect.
In the orientation process, the magnet application time can be shortened by increasing the number of magnets, but the challenge to shortening the cycle time of the orientation process is to find a way to quickly dry the material before the orientation is lost.
そこで送風している空気の風量を上げるととも
に塗料に使用している樹脂が熱硬化性であること
から熱風を吹きつけることとし、また配向性が最
も良い磁石の磁場が及ぶ範囲で、塗布膜が厚くて
乾燥しにくい外周側に重点的に熱風をかけること
により、配向度を高くでき、かつ内外周で均一な
配向ができるものである。 Therefore, we decided to increase the amount of air being blown and blow hot air because the resin used in the paint is thermosetting.We also decided to blow hot air within the range covered by the magnetic field of the magnet with the best orientation. By applying hot air preferentially to the outer periphery, which is thick and difficult to dry, the degree of orientation can be increased and uniform orientation can be achieved on the inner and outer peripheries.
以下、本発明の一実施例を図により説明する。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第２図は本発明の一実施例による磁場配向方法
を示す図で、ａは平面図、ｂは正面図である。ス
ピンドル２に取り付けられた塗布デイスク１は
30RPMで回転しながら磁石４によつて約50秒間
磁界が印加される。その後熱風ユニツト９によつ
て温度約60℃、風量約４m3／minに制御された熱
風をダクト１０を経由して吹出口１１から矢印１
２の方向に約50秒間吹き付けて塗膜８を強制的に
乾燥させる。なお吹出口１１は塗膜が磁石４を出
た直後に、両塗膜面に均一に熱風がかかるように
配置してある。 FIG. 2 is a diagram showing a magnetic field orientation method according to an embodiment of the present invention, in which a is a plan view and b is a front view. The coating disk 1 attached to the spindle 2 is
A magnetic field is applied for about 50 seconds by magnet 4 while rotating at 30 RPM. After that, hot air controlled by the hot air unit 9 at a temperature of about 60°C and an air volume of about 4 m 3 /min is sent through the duct 10 from the outlet 11 at the arrow 1.
The coating film 8 is forcibly dried by spraying in the direction 2 for about 50 seconds. The air outlet 11 is arranged so that hot air is uniformly applied to both coated film surfaces immediately after the coated film leaves the magnet 4.
なお本実施例において磁性塗料はエポキシ樹脂
16.7重量部、フエノール樹脂16.7重量部、PVB樹
脂4.6重量部、単結晶アルミナ粉８重量部、
γFe2O3針状磁性粉54重量部、を溶剤とともに混
練したものを使用した。 In this example, the magnetic paint is epoxy resin.
16.7 parts by weight, 16.7 parts by weight of phenolic resin, 4.6 parts by weight of PVB resin, 8 parts by weight of single crystal alumina powder,
54 parts by weight of γFe 2 O 3 acicular magnetic powder was kneaded with a solvent.
第３図は磁石の磁場により磁性粉が配向される
様子を塗膜断面を模式的に示した図である。塗膜
８中の磁性粉５は磁石４の漏洩磁場１６の及ぶ範
囲１３で水平に整列し、磁石直下の範囲１４で塗
膜面に垂直に立ち、一対の磁石の間の範囲１５で
再び水平に整列し、次の磁石の直下１４で垂直に
なり、磁石の出力１３で漏洩磁場１６により水平
に整列するというように塗膜中で回転しながら配
向される。しかし漏洩磁場１６から磁性粉５が脱
出する時に漏洩磁場１６の向きは塗膜面にほぼ垂
直であるため磁性粉は再び立つことになる。（但
し磁力が弱まつているため垂直には立たない。）
このことから磁場の影響で磁性粉が水平になつて
いる磁石の出口に熱風を吹きつけることによつて
磁性粉の漏洩磁場から脱出するときに立つ現象を
おさえて、磁性粉が塗膜に水平な良好な配向が得
られる。 FIG. 3 is a diagram schematically showing a cross section of a coating film showing how magnetic powder is oriented by the magnetic field of a magnet. The magnetic powder 5 in the coating film 8 is aligned horizontally in the range 13 covered by the leakage magnetic field 16 of the magnet 4, stands perpendicular to the coating surface in the range 14 directly under the magnet, and becomes horizontal again in the range 15 between the pair of magnets. The magnets are aligned while rotating in the coating film, becoming vertically aligned directly under the next magnet 14, and aligned horizontally by the leakage magnetic field 16 at the output 13 of the magnet. However, when the magnetic powder 5 escapes from the leakage magnetic field 16, the magnetic powder stands up again because the direction of the leakage magnetic field 16 is almost perpendicular to the coating surface. (However, because the magnetic force has weakened, it cannot stand vertically.)
Therefore, by blowing hot air at the exit of the magnet where the magnetic powder is horizontal due to the influence of the magnetic field, we can suppress the phenomenon of the magnetic powder standing up when it escapes from the leakage magnetic field, and make the magnetic powder horizontal to the coating film. Good alignment can be obtained.
第４図は本実施例による効果を表わす図であ
る。磁場印加時間を50秒、乾燥時間を50秒にして
配向した結果で曲線Ａは従来のフアンによる乾
燥、曲線Ｂは60℃、４m3／minの熱風を塗膜に垂
直にあてた場合、曲線Ｃは該熱風を外周から内周
に向けてあてた場合の配向度の違いを示す。縦軸
に配向度を示す角型比（Br／Bs）、横軸にデイス
クの半径をとると、曲線Ａでは絶対的な配向度不
足、曲線Ｂでは内周が早く乾燥しすぎたことによ
る配向不足となり、本発明による方法（曲線Ｃ）
が最も配向度が高く、かつデイスクの内外周で均
一の値を示している。 FIG. 4 is a diagram showing the effects of this embodiment. Curve A is the result of orientation when the magnetic field is applied for 50 seconds and the drying time is 50 seconds. Curve A is the result of drying using a conventional fan, and curve B is the curve obtained when hot air at 60°C and 4 m 3 /min is applied perpendicularly to the coating film. C indicates the difference in degree of orientation when the hot air is applied from the outer circumference to the inner circumference. If we take the squareness ratio (Br/Bs), which indicates the degree of orientation, on the vertical axis, and the radius of the disk on the horizontal axis, we can see that curve A shows an absolute lack of orientation, and curve B shows orientation due to the inner periphery drying too quickly. The method according to the invention (curve C)
has the highest degree of orientation, and shows uniform values on the inner and outer peripheries of the disk.
第５図は配向効率を表わす図である。縦軸に角
型比、横軸に磁場印加時間と乾燥時間の合計をと
つて一定の角型比（0.75）になるまでの時間をみ
ると従来方法（曲線Ｄ）では約200秒必要で、本
実施例（曲線Ｅ）によれば約100秒で良いことが
わかる。 FIG. 5 is a diagram showing orientation efficiency. The vertical axis is the squareness ratio, and the horizontal axis is the total of the magnetic field application time and drying time, and when looking at the time to reach a constant squareness ratio (0.75), the conventional method (curve D) requires about 200 seconds. According to this example (curve E), it can be seen that about 100 seconds is sufficient.
このように本実施例によれば、塗布膜の品質を
落すことなく磁場配向時間のタクトタイムが60〜
100秒に短縮できるので磁気デイスクの大幅な生
産性向上が可能となる。また熱風吹出口を磁気デ
イスクの両塗膜面に配置（２本）する必要がない
ので、安価な磁場配向装置となる効果も合せもつ
ている。 In this way, according to this example, the takt time of the magnetic field orientation time can be reduced to 60~60°C without degrading the quality of the coating film.
Since it can be shortened to 100 seconds, it is possible to significantly improve the productivity of magnetic disks. Furthermore, since it is not necessary to arrange (two) hot air outlets on both coated surfaces of the magnetic disk, it also has the effect of becoming an inexpensive magnetic field alignment device.
本発明によれば塗布膜の品質を落すことなく配
向時間のタクトタイムが60〜100秒に低減できる
ので磁気デイスクの大幅な生産性向上が可能とな
る。
According to the present invention, the takt time for orientation can be reduced to 60 to 100 seconds without degrading the quality of the coating film, making it possible to significantly improve the productivity of magnetic disks.
第１図は従来の磁場配向方法を示す装置正面
図、第２図は本発明の一実施例を示す図でａは平
面図、ｂは正面図、第３図は磁性粉の動き方を模
式的に示した磁気デイスクの断面図、第４図は本
発明の効果を示す配向度の比較図、第５図は本発
明の効果を示す配向効率の比較図である。
１…塗布デイスク、２…スピンドル、３…回転
方向を示す矢印、４…磁石、５…磁性粉、６…フ
アン、７…チヤンバ、８…塗膜、９…熱風ユニツ
ト、１０…ダクト、１１…吹出口、１２…熱風の
方向を示す矢印、１３…漏洩磁場の及ぶ範囲、１
４…磁石直下の範囲、１５…対の磁石の間の範
囲、１６…漏洩磁場、１７…空気の流れを示す矢
印。
Figure 1 is a front view of a device showing a conventional magnetic field orientation method, Figure 2 is a diagram showing an embodiment of the present invention, where a is a plan view, b is a front view, and Figure 3 is a schematic diagram showing how magnetic powder moves. FIG. 4 is a comparison diagram of orientation degree showing the effect of the present invention, and FIG. 5 is a comparison diagram of orientation efficiency showing the effect of the present invention. DESCRIPTION OF SYMBOLS 1... Coating disk, 2... Spindle, 3... Arrow indicating rotation direction, 4... Magnet, 5... Magnetic powder, 6... Fan, 7... Chamber, 8... Coating film, 9... Hot air unit, 10... Duct, 11... Air outlet, 12...Arrow indicating the direction of hot air, 13...Range of leakage magnetic field, 1
4... Range directly under the magnet, 15... Range between the pair of magnets, 16... Leakage magnetic field, 17... Arrow indicating air flow.
Claims (1)
有する磁気デイスクを回転させながら磁石によ
り、磁界を印加して前記磁性塗料に含まれる磁性
粒子を一方向に配向処理しつつ乾燥させる磁気デ
イスクの製造方法において、熱風を前記磁気デイ
スクの前記磁石を通過する位置でかつ当該磁気デ
イスクの外周側から内周側に向けて吹きつけるこ
とを特徴とする磁気デイスクの製造方法。1. A magnetic disk coated with magnetic paint and having a coating film in an undried state is rotated and a magnetic field is applied by a magnet to orient the magnetic particles contained in the magnetic paint in one direction while drying the magnetic disk. A method for manufacturing a magnetic disk, characterized in that hot air is blown from the outer circumferential side of the magnetic disk toward the inner circumferential side at a position where the hot air passes through the magnet of the magnetic disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23973783A JPS60133543A (en) | 1983-12-21 | 1983-12-21 | Production of magnetic disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23973783A JPS60133543A (en) | 1983-12-21 | 1983-12-21 | Production of magnetic disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60133543A JPS60133543A (en) | 1985-07-16 |
| JPH0222448B2 true JPH0222448B2 (en) | 1990-05-18 |
Family
ID=17049178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23973783A Granted JPS60133543A (en) | 1983-12-21 | 1983-12-21 | Production of magnetic disc |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60133543A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0552249A (en) * | 1991-08-21 | 1993-03-02 | Kojima Press Co Ltd | Rolling pulley and manufacture thereof |
-
1983
- 1983-12-21 JP JP23973783A patent/JPS60133543A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0552249A (en) * | 1991-08-21 | 1993-03-02 | Kojima Press Co Ltd | Rolling pulley and manufacture thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60133543A (en) | 1985-07-16 |
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