JPS62243129A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPS62243129A JPS62243129A JP8746686A JP8746686A JPS62243129A JP S62243129 A JPS62243129 A JP S62243129A JP 8746686 A JP8746686 A JP 8746686A JP 8746686 A JP8746686 A JP 8746686A JP S62243129 A JPS62243129 A JP S62243129A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- powder particles
- magnetic powder
- magnetic field
- substrate
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000006247 magnetic powder Substances 0.000 claims abstract description 66
- 239000002245 particle Substances 0.000 claims abstract description 59
- 230000005415 magnetization Effects 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 4
- 239000003973 paint Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 abstract description 53
- 238000000576 coating method Methods 0.000 abstract description 53
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000000843 powder Substances 0.000 description 12
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000012948 isocyanate Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 239000012461 cellulose resin Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- -1 isocyanate compounds Chemical class 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は磁気記録媒体の製造方法に関し、さらに詳し
くは、磁性粉末の配向性が良好で電気的特性に優れた磁
気記録媒体の製造方法に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for manufacturing a magnetic recording medium, and more particularly, to a method for manufacturing a magnetic recording medium with good orientation of magnetic powder and excellent electrical properties. .
一般に磁気テープなどの磁気記録媒体は、第3図に示す
ように、繰り出しロールlより繰り出されるベースフィ
ルム2を、一定速度で走行させながら、リバースロール
、グラビアロールなどの塗工[1110で磁性塗料を塗
布し、その塗膜4が未乾燥状態にある間に磁場配向装W
llに導いて磁性塗膜4中の磁性粉末粒子の磁化容易軸
を一定方向に配向させ、その後乾燥機5に導通して完全
に乾燥、硬化させたのち、巻き取りロール8に巻き取る
方法でつくられている。In general, magnetic recording media such as magnetic tapes are coated with a reverse roll, gravure roll, etc. [1110] While a base film 2 is fed out from a feed roll 1 and run at a constant speed, as shown in FIG. is applied, and while the coating film 4 is in an undried state, a magnetic field orientation device W is applied.
ll to orient the axis of easy magnetization of the magnetic powder particles in the magnetic coating 4 in a certain direction, and then conduct to the dryer 5 to completely dry and harden, and then wind it up on the winding roll 8. It is being created.
磁場配向装置11においては、一般に、磁性粒子を磁化
容易軸がベースフィルム2の走行方向(長手方向)aに
沿うように配向させるのが導通であり、このためN−N
対向磁石あるいはS−8対向磁石を用いてこの対向磁石
間に未乾燥塗III 4を有するベースフィルム2を導
入出させるか、あるいは直流電流を通じたソレノイドに
未乾燥塗膜4を有するベースフィルム2を導入出させる
という方法が採用されている。In the magnetic field orientation device 11, conduction is generally used to orient the magnetic particles so that the axis of easy magnetization is along the traveling direction (longitudinal direction) a of the base film 2, and therefore N-N
The base film 2 with the wet coating III 4 is introduced between the opposing magnets using a facing magnet or an S-8 facing magnet, or the base film 2 with the wet coating III 4 is introduced into a solenoid through which a direct current is passed. The method of introduction and release is adopted.
ところが、この方法では一旦磁界を加えて磁性粉末粒子
を走行方向に配向させた後、乾燥されるまでに磁性塗膜
が磁界外に出るため、機械的振動や結合剤樹脂の弾性緩
和などの外的擾乱によって、一旦ベースフイルムの走行
方向に配向された磁性粉末粒子の配列が乱され、さらに
乾燥過程での結合剤樹脂の収縮に伴って生ずる外力によ
っても磁性粉末粒子の方向性が乱されて、磁性粉末を充
分良好に配向することができない。However, in this method, once a magnetic field is applied to orient the magnetic powder particles in the running direction, the magnetic coating film is removed from the magnetic field by the time it is dried, which causes problems such as mechanical vibration and elastic relaxation of the binder resin. Due to target disturbance, the arrangement of the magnetic powder particles, which were once oriented in the running direction of the base film, is disturbed, and furthermore, the orientation of the magnetic powder particles is also disturbed by the external force generated due to the contraction of the binder resin during the drying process. , it is not possible to orient the magnetic powder sufficiently well.
そこで、このような磁性粉末粒子の配向性の乱れを防ぐ
必要があり、その方法として、ベースフィルム上に磁性
塗料を塗布後、乾燥固化するまで磁場を加えておくこと
が容易に考えられ、具体的手段としては、長大ソレノイ
ドあるいは適当な大きさのソレノイドを多数直列に並べ
て、塗布後、乾燥固化するまで磁場を加えておくか、あ
るいは第4図に示すように、N−N対向磁石(S−3対
向磁石であってもよい)6,6を乾燥ta5の内外に多
数並設し、この対向磁石6.6により発生する平行磁界
中を、未乾燥の磁性塗膜4を形成した′ ベースフィル
ム2を走行させて、未乾燥の磁性塗膜4が乾燥するまで
対向磁石6.6により発生する平行磁界でもって、磁性
塗膜4中の磁性粉末粒子をベースフィルム2の走行方向
に配向させることが容易に考えられる。Therefore, it is necessary to prevent such disturbance of the orientation of the magnetic powder particles, and one easy way to do this is to apply a magnetic field after applying the magnetic paint on the base film until it dries and solidifies. This can be achieved by arranging long solenoids or a large number of appropriately sized solenoids in series and applying a magnetic field after coating until dry and solidified, or by applying N-N opposed magnets (S) as shown in Figure 4. -3 facing magnets 6, 6) are arranged in parallel inside and outside the dry ta5, and the undried magnetic coating film 4 is formed in the parallel magnetic field generated by the facing magnets 6.6. The magnetic powder particles in the magnetic coating film 4 are oriented in the running direction of the base film 2 by running the film 2 and using the parallel magnetic field generated by the opposing magnet 6.6 until the undried magnetic coating film 4 is dried. This can easily be considered.
ところが、長大ソレノイドあるいは適当な大きさのソレ
ノイドを多数直列に並べて、塗布後、乾燥固化するまで
磁場を加える方法では、同一方向の磁場を直線的に発生
することができるので理想的であるものの、現実問題と
してはその間に塗料中の有機溶剤を蒸発乾燥させる必要
があり、この乾燥のため多くの場合熱風を多量に送り込
まなければならず、さらに数千エルステッドの大磁界を
必要とするため、コイルが大型になるとともに電気容量
も大きくなり、莫大な費用を要し現実的でない。However, the method of arranging a long solenoid or a large number of appropriately sized solenoids in series and applying a magnetic field after coating until it dries and solidifies is ideal because it can linearly generate a magnetic field in the same direction. In reality, it is necessary to evaporate the organic solvent in the paint during this time, and this drying often requires a large amount of hot air to be pumped in. Furthermore, a large magnetic field of several thousand oersteds is required, so the coil As the size increases, the electric capacity also increases, requiring a huge amount of cost, which is impractical.
また、第4図に示すように、N−N対向磁石6.6を乾
燥機5の内外に多数並設し、これらの対向磁石6.6に
より未乾燥の磁性塗膜4が乾燥するまで平行磁界を作用
させて、磁性塗膜4中の磁性粉末粒子をベースフィルム
2の走行方向に配向させる配向方式にあっては、第5図
の磁界の強さの分布図に示すように、最初のN−N対向
磁石6.6から次のN−N対向磁石6.6間を順次に磁
性塗膜4が走行する間に、これらの並設したN−N対向
磁石間で磁界の方向が徐々に反転し、一旦配向した磁性
粉末粒子が反対方向の磁界に入ったとき逆向きの磁力が
徐々に作用するため、磁性粉末粒子の回転が生じてその
配向が乱れてしまい、磁性粉末粒子を良好に配向するこ
とができない。In addition, as shown in FIG. 4, a large number of N-N opposing magnets 6.6 are arranged in parallel inside and outside the dryer 5, and these opposing magnets 6.6 keep the undried magnetic coating film 4 in parallel until it is dried. In the orientation method of applying a magnetic field to orient the magnetic powder particles in the magnetic coating film 4 in the running direction of the base film 2, as shown in the distribution diagram of the magnetic field strength in FIG. While the magnetic coating film 4 sequentially travels from one N-N opposing magnet 6.6 to the next N-N opposing magnet 6.6, the direction of the magnetic field gradually changes between these N-N opposing magnets arranged in parallel. When the once oriented magnetic powder particles enter a magnetic field in the opposite direction, a magnetic force in the opposite direction gradually acts on them, causing rotation of the magnetic powder particles and disrupting their orientation. cannot be oriented.
この発明はかかる問題を克服するため鋭急検討を行った
結果なされたもので、基体上に磁性塗料を塗布し、次い
で、これを、磁性塗料中に含まれる磁性粉末の保磁力よ
り高い磁界強度をもつN−N反発磁界とS−S反発磁界
とを交互に少なくとも一組以上並設した磁界中に導入し
て走行させ、磁性塗料を徐々に硬化させながら、走行す
る基体上の磁性塗料中に含まれる磁性粉末粒子に正負交
互に磁界を作用させて、基体の走行に伴って前記磁性粉
末粒子に作用する正から負または負から正に反転する磁
界の反転を、磁性粉末粒子がこの磁界反転の作用で回転
を開始する前に終了させることによって、磁性粉末粒子
を回転させることなく、磁性粉末粒子の磁化の方向のみ
を反転させて、磁性粉末粒子の磁化容易軸を基体の走行
方向に良好に配向させ、磁気記録媒体の電気的特性を充
分に向上させたものである。This invention was made as a result of urgent research to overcome this problem. Magnetic paint is applied onto a substrate, and then magnetic field strength higher than the coercive force of the magnetic powder contained in the magnetic paint is applied. At least one set of an N-N repulsive magnetic field and an S-S repulsive magnetic field are alternately introduced in parallel, and the magnetic paint is gradually hardened, while the magnetic paint on the traveling substrate is gradually hardened. A positive and negative magnetic field is applied alternately to the magnetic powder particles contained in the substrate, and as the base moves, the magnetic powder particles can reverse the reversal of the magnetic field acting on the magnetic powder particles from positive to negative or from negative to positive. By terminating rotation before it starts due to the action of reversal, only the direction of magnetization of the magnetic powder particles is reversed without rotating the magnetic powder particles, and the axis of easy magnetization of the magnetic powder particles is aligned with the running direction of the substrate. The magnetic recording medium is well oriented and the electrical characteristics of the magnetic recording medium are sufficiently improved.
以下、この発明を図面を参考にして説明する。This invention will be explained below with reference to the drawings.
第1図はこの発明の磁気記録媒体の製造方法の概略を示
したもので、この方法では、繰り出しロールlから繰り
出されるベースフィルム2を、一定速度で走行させなが
ら、コーティングヘッド3で磁性塗料を塗布し、ベース
フィルム2上に塗布形成した磁性塗膜4が未乾燥状態に
ある間に、乾燥機5の直前に配設されたN−N対向磁石
6.6間に導く。続いて乾燥機5内に導入し、乾燥機5
内に交互に多数並設されたS−S対向磁石7.7、N−
N対向磁石6.6間に導いて、磁性塗膜4を乾燥しなが
ら磁性塗膜4中の磁性粉末粒子の磁化容易軸をベースフ
ィルム2の走行方向aに沿って配向させ、完全に乾燥、
硬化させたのち、乾燥Ul 5から導出して、巻き取り
ロール8に巻き取っている。9はコーティングへソド3
で塗布する磁性塗料中の不純物を濾過するだめのフィル
ターである。FIG. 1 shows an outline of a method for manufacturing a magnetic recording medium according to the present invention. In this method, a base film 2 fed out from a feed roll l is run at a constant speed while a coating head 3 coats the magnetic paint. While the magnetic coating film 4 coated and formed on the base film 2 is in an undried state, it is guided between N and N opposing magnets 6 and 6 disposed immediately before the dryer 5. Then, it is introduced into the dryer 5, and
A large number of S-S opposing magnets 7.7, N-
While drying the magnetic coating film 4 by guiding it between N opposing magnets 6.6, the axis of easy magnetization of the magnetic powder particles in the magnetic coating film 4 is oriented along the running direction a of the base film 2, and completely dried.
After curing, the dried Ul 5 is extracted and wound onto a winding roll 8. 9 goes to coating 3
This is a filter that filters out impurities in the magnetic paint that is applied.
しかして、乾燥機5の直前と乾燥!a5内に交互に多数
並設されたN−N対向磁石6.6およびS−S対向磁石
7,7間に、磁性塗膜4が設けられたベースフィルム2
が導入されると、まず乾燥機5の直前のN−N対向磁石
6.6のN−N反発磁界によって、磁性塗膜4中の磁性
粉末粒子はベースフィルム2の走行方向に配向される。However, just before dryer 5 and dry! A base film 2 in which a magnetic coating film 4 is provided between a large number of N-N opposing magnets 6.6 and S-S opposing magnets 7, 7, which are alternately arranged in parallel in a5.
When the dryer 5 is introduced, the magnetic powder particles in the magnetic coating film 4 are first oriented in the running direction of the base film 2 by the N-N repulsive magnetic field of the N-N opposing magnet 6.6 immediately before the dryer 5.
その後、ベースフィルム2の走行゛に従い、第2図の磁
界の強さの分布図に示すように、磁界の反転がN−N対
向磁石6.6から次のS−S対向磁石7.7に到達した
時点、およびS−S対向磁石7,7がら次のN−N対向
磁石6.6に到達した時点で瞬間的に起こり、この磁界
の反転は、ベースフィルム2がN−N対向磁石6,6お
よびS−S対向磁石7.7に到達する毎に瞬間的に繰り
返される。Thereafter, as the base film 2 travels, the magnetic field is reversed from the N-N opposing magnet 6.6 to the next S-S opposing magnet 7.7, as shown in the magnetic field strength distribution diagram in FIG. This reversal of the magnetic field occurs instantaneously when the base film 2 reaches the next N-N opposing magnet 6.6 from the S-S opposing magnets 7, 7. , 6 and the S-S opposing magnet 7.7 is instantaneously repeated.
従って、次のN−N対向磁石6,6間、あるいはS−S
対向磁石7.7間に到達した時点で、初めて瞬間的に磁
界の方向が反転するまで、一旦配向した磁性粉末粒子に
逆向きの磁力が作用せず、隣接するN−N対向磁石6.
6とS−S対向磁石7.7との間では、第5図に示した
ように磁界が徐々に連続して反転することもない。その
結果、磁性塗膜4中の磁性粉末粒子に徐々に連続して反
転する磁界の作用がない。Therefore, between the next N-N opposing magnets 6, 6 or S-S
Until the direction of the magnetic field momentarily reverses for the first time when the particles reach between the opposing magnets 7.7, no magnetic force in the opposite direction acts on the once oriented magnetic powder particles, and the magnetic powder particles are not affected by the opposite magnetic force between the adjacent N-N opposing magnets 6.
6 and the S-S opposing magnet 7.7, the magnetic field does not gradually and continuously reverse as shown in FIG. As a result, the magnetic powder particles in the magnetic coating film 4 are not affected by a magnetic field that gradually and continuously reverses.
しかして、交互に多数配設したN−N対向磁石6.6お
よびS−8対向磁石7.7の磁界強度を、磁性塗膜4が
これらのN−N対向磁石6.6間、あるいはS−S対向
磁石7.7間に到達した時点で、瞬間的に磁性塗膜4中
の磁性粉末粒子の磁界の方向が反転できる強度とし、ま
た磁性塗膜4を形成する磁性塗料の粘性を瞬間的に磁性
粉末粒子の磁界の方向が反転する際、この反転磁界によ
って磁性粉末粒子の回転が起こらない程度の粘性にし、
さらに磁性塗膜4の走行速度を瞬間的に磁性粉末粒子の
磁界の方向が反転されて、磁性粉末粒子の回転が生じた
りする余裕のない速度にすれば、磁性塗膜4がこれらの
N−N対向磁石6.6間、あるいはS−S対向磁石7.
7間に到達した時点で、磁界の反転に伴って磁性!!!
膜4中の磁性粉末粒子の回転が起こるより早(磁性粉末
粒子内の磁化のみが反転する。従って、磁性粉末粒子は
、磁性塗膜4中で回転することなく、最初のN−N対向
磁石6,6によって配向された状態で良好に磁性塗膜4
中に保持され、磁性粉末粒子の磁化の方向のみが反転し
て、ベースフィルム2の走行方向に容易かつ良好に配向
され、角型が充分に向上されて、電磁変換特性が充分に
向上される。Therefore, the magnetic coating film 4 changes the magnetic field strength of the N-N opposing magnets 6.6 and the S-8 opposing magnets 7.7, which are arranged in large numbers alternately, between these N-N opposing magnets 6.6 or S-8 opposing magnets 6.6. -S When reaching between the opposing magnets 7 and 7, the strength is set such that the direction of the magnetic field of the magnetic powder particles in the magnetic coating film 4 can be instantaneously reversed, and the viscosity of the magnetic paint forming the magnetic coating film 4 is instantaneously reduced. The viscosity is such that when the direction of the magnetic field of the magnetic powder particles is reversed, the magnetic powder particles do not rotate due to this reversal magnetic field.
Furthermore, if the traveling speed of the magnetic coating film 4 is set to a speed that does not allow for the direction of the magnetic field of the magnetic powder particles to be instantaneously reversed and rotation of the magnetic powder particles to occur, the magnetic coating film 4 will be able to absorb these N- Between N opposing magnets 6.6 or S-S opposing magnets 7.
At the point when it reaches between 7 and 7, the magnetic field changes and becomes magnetic! ! !
Before the rotation of the magnetic powder particles in the film 4 occurs (only the magnetization within the magnetic powder particles is reversed. Therefore, the magnetic powder particles do not rotate in the magnetic coating 4, but move toward the first N-N opposing magnet. The magnetic coating film 4 is well oriented in the state oriented by 6, 6.
Only the direction of magnetization of the magnetic powder particles is reversed, and the magnetic powder particles are easily and well oriented in the running direction of the base film 2, so that the square shape is sufficiently improved and the electromagnetic conversion characteristics are sufficiently improved. .
このように、磁性粉末粒子を回転させることなく磁性粉
末粒子の磁化のみを、良好に繰り返し反転させるため、
交互に多数配設したN−N対向磁石6,6およびS−S
対向磁石7.7の磁界強度は、磁性塗膜4中に含まれる
磁性粉末の保磁力より大きくするのが好ましく、対向磁
石により発生する磁界強度が、磁性塗膜4中に含まれる
磁性粉末の保磁力より小さくては、磁性粉末粒子の磁化
の方向を瞬間的に反転させることができない。In this way, in order to successfully repeatedly reverse only the magnetization of the magnetic powder particles without rotating the magnetic powder particles,
Numerous N-N opposing magnets 6, 6 and S-S arranged alternately
The magnetic field strength of the opposing magnets 7.7 is preferably greater than the coercive force of the magnetic powder contained in the magnetic coating 4, and the magnetic field intensity generated by the opposing magnets is greater than the coercive force of the magnetic powder contained in the magnetic coating 4. If the coercive force is smaller than the coercive force, the direction of magnetization of the magnetic powder particles cannot be instantaneously reversed.
また磁性塗膜4を形成する磁性塗料の粘性は、ブルック
フィールド型粘度計による測定値で20センヂボイズ以
上の粘度を有するものであることが好ましく、磁性塗膜
4の粘度が20センヂボイズより低くては、磁性粉末粒
子がきわめて動き易く、隣接するN−N対向磁石6,6
とs−s対向磁石7,7との間で、磁界の反転により磁
性塗膜4中の磁性粉末粒子が回転してしまう。The viscosity of the magnetic paint forming the magnetic coating film 4 is preferably 20 centiboise or more as measured by a Brookfield viscometer, and the viscosity of the magnetic coating film 4 is preferably lower than 20 centiboise. , the magnetic powder particles move very easily, and the adjacent N-N opposing magnets 6, 6
The magnetic powder particles in the magnetic coating film 4 rotate due to the reversal of the magnetic field between the magnets 7 and the ss opposing magnets 7, 7.
さらに磁性塗膜4の走行速度は、1m/分以上の速度で
あることが好ましく、1m/分以上であればいくら速く
てもよいが、磁性塗膜4の走行速度が1m/分より遅い
場合は、磁性粉末粒子が、瞬間的な反転磁界でなく、緩
慢な磁界の変化を受けて対向磁石により発生する磁場の
中をゆっくり移動し、磁性塗膜4中の磁性粉末粒子の移
動速度が遅くなるため、磁界の方向の変化に従って、磁
性粉末粒子自体が反転する磁力を受けて回転し、一旦配
向した磁性粉末粒子の配列が乱れ、磁性粉末粒子の良好
な配向が行えない。Furthermore, the traveling speed of the magnetic coating film 4 is preferably 1 m/min or more, and may be as fast as it is 1 m/min or more, but if the traveling speed of the magnetic coating 4 is slower than 1 m/min. In this case, the magnetic powder particles move slowly in the magnetic field generated by the opposing magnets due to slow changes in the magnetic field rather than an instantaneous reversal magnetic field, and the moving speed of the magnetic powder particles in the magnetic coating 4 is slow. Therefore, as the direction of the magnetic field changes, the magnetic powder particles themselves rotate under the influence of a reversing magnetic force, and the once oriented arrangement of the magnetic powder particles is disturbed, making it impossible to achieve good orientation of the magnetic powder particles.
このように交互に並設されたたN−N対向磁石6.6お
よびS−8対向値石7,7は、たとえ乾燥機5内に配設
されていても、乾燥が完了する前に配向磁界を作用させ
なくすると、磁性塗膜4中の磁性粉末粒子に反転磁界に
よる回転力か作用するため、ベースフィルム2上の磁性
塗膜4が乾燥して磁性塗膜4が硬化し、磁性粉末粒子が
容易に動かなくなるまで、磁性塗膜4の上下に配設され
ていることが好ましく、乾燥機5内の磁性塗膜4が乾燥
する時点まで配設しておくのが好ましい。Even if the N-N opposing magnets 6.6 and the S-8 opposing value stones 7, 7 arranged in parallel in this way are arranged in the dryer 5, they are oriented before drying is completed. When the magnetic field is no longer applied, the rotational force due to the reversal magnetic field acts on the magnetic powder particles in the magnetic coating film 4, so the magnetic coating film 4 on the base film 2 dries and hardens, and the magnetic powder particles It is preferable that the magnetic coating film 4 is disposed above and below the magnetic coating film 4 until the particles no longer move easily, and preferably until the magnetic coating film 4 in the dryer 5 is dried.
なお、以上の例では、磁性塗膜4の硬化を乾燥機5を使
用して行う場合について説明したが、これに限定される
ものではなく、たとえば、磁性塗料を調製する際の結合
剤樹脂として、放射線硬化型樹脂を使用し、放射線の照
射によって磁性塗膜4を硬化する場合でも同様にして、
放射線の照射により磁性塗膜4を硬化しながら、この発
明の磁性粉末粒子の配向処理を行うことができ、この場
合も前記の場合と同様な効果が得られる。In addition, in the above example, the case where the magnetic coating film 4 is cured using the dryer 5 has been explained, but the invention is not limited to this. Similarly, when using a radiation-curable resin and curing the magnetic coating film 4 by irradiation with radiation,
The orientation treatment of the magnetic powder particles of the present invention can be performed while the magnetic coating film 4 is being cured by irradiation with radiation, and in this case as well, the same effects as in the above case can be obtained.
磁性塗料を調製する際、使用される磁性粉末としては、
r−Fe203粉末、Fe3O4粉末、r−Fe203
とFe50.の中間酸化鉄粉末、Co含有r−Fe20
3粉末、Co含有Fe3O4粉末1、Fe粉末、Feを
主体として各種金属を添加した金属粉末、Co粉末、N
i粉末、あるいはこれらの合金粉末など、従来一般に広
く使用されるものがいずれも好適なものとして使用され
る。When preparing magnetic paint, the magnetic powder used is:
r-Fe203 powder, Fe3O4 powder, r-Fe203
and Fe50. intermediate iron oxide powder, Co-containing r-Fe20
3 powder, Co-containing Fe3O4 powder 1, Fe powder, metal powder mainly composed of Fe with addition of various metals, Co powder, N
Any of the powders commonly used in the past, such as i powder or alloy powders thereof, can be suitably used.
また、結合剤樹脂としては、塩化ビニル−酢酸ビニル系
共重合体、ポリビニルブチラール樹脂、繊維素系樹脂、
ポリウレタン系樹脂、ポリエステル系樹脂、イソシアネ
ート化合物など従来汎用されている結合剤樹脂が広く用
いられる。In addition, as the binder resin, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral resin, cellulose resin,
Conventional binder resins such as polyurethane resins, polyester resins, and isocyanate compounds are widely used.
有機溶剤としては、トルエン、メチルイソブチルケトン
、メチルエチルう一トン、シクロヘキサノン、テトラヒ
ドロフラン、酢酸エチルなど従来から汎用されている有
機溶剤が、単独または二種以上混合して使用される。As the organic solvent, conventionally used organic solvents such as toluene, methyl isobutyl ketone, methyl ethyl ketone, cyclohexanone, tetrahydrofuran, and ethyl acetate can be used alone or in combination of two or more.
なお、磁性塗料中には、通常使用されている各種添加剤
、たとえば、分散剤、潤滑剤、充填剤、帯電防止剤など
を任意に添加使用してもよい。Note that various commonly used additives such as dispersants, lubricants, fillers, antistatic agents, etc. may be optionally added to the magnetic coating material.
次に、この発明の実施例について説明する。 Next, embodiments of the invention will be described.
実施例1
針状r−Fe203粉末 80重量部(保磁力
370エルステツド)
塩化ビニル−酢酸ビニル−ビニ 9 〃ルアルコール
共正合体
ポリウレタン樹脂 9 〃三官能性低
分子量イソシアネー 2 〃ト化合物
メチルイソブチルケトン 60〃トルエン
60〃この組成物をボールミルで
48時間混合分散して粘度4.0ポイズ(リヨン簡易粘
度針)の磁性塗料を調整した。この磁性塗料をコーティ
ングヘッド3を用いて、厚さ12μmのポリエステルベ
ースフィルム2上に塗布速度10m/1linで塗布し
、これが未乾燥状態にある間に、第1図で示される乾燥
機5内外に6個所配設されたN−N対向磁石6.6およ
びS−S対向磁石7.7間に導入出させ、同時に熱風乾
燥した。6箇目のS−S対向磁石7.7は塗膜が外観上
溶剤光沢を失うところとし、その後、残存溶剤を無くす
るため温度95℃で充分熱風乾燥して、乾燥厚が6μm
の磁性層を形成した。しかる後、所定の巾に裁断して磁
気テープをつくった。磁界の強さは、対極間中心のなす
面と磁石端面の交線上で対向磁石と直角方向、すなわち
フィルムの走行面が磁石端面を通過するところで走行方
向の磁界を測定し、磁界の強さは磁石間隔により150
0エルステツドに調整して行った。Example 1 Acicular r-Fe203 powder 80 parts by weight (coercive force 370 oersted) Vinyl chloride-vinyl acetate-vinyl 9 Alcohol copolymer polyurethane resin 9 Trifunctional low molecular weight isocyanate 2 Compound methyl isobutyl ketone 60 〃toluene
60 This composition was mixed and dispersed in a ball mill for 48 hours to prepare a magnetic paint having a viscosity of 4.0 poise (Lyon simple viscosity needle). This magnetic paint is applied onto a polyester base film 2 with a thickness of 12 μm at a coating speed of 10 m/1 lin using a coating head 3, and while it is in an undried state, inside and outside of a dryer 5 shown in FIG. It was introduced between N--N opposing magnets 6.6 and S--S opposing magnets 7.7, which were arranged at six locations, and was simultaneously dried with hot air. The sixth S-S facing magnet 7.7 is where the coating film loses its solvent luster in appearance, and is then thoroughly dried with hot air at a temperature of 95°C to eliminate residual solvent, resulting in a dry thickness of 6 μm.
A magnetic layer was formed. After that, it was cut to a specified width to make magnetic tape. The strength of the magnetic field is determined by measuring the magnetic field in the direction perpendicular to the opposing magnet on the intersection line between the center of the opposing electrodes and the end face of the magnet, that is, where the running surface of the film passes through the end face of the magnet. 150 depending on magnet spacing
I adjusted it to 0 oersted.
比較例1
実施例1において、第1図で示される乾燥機5内外に配
設されたN−N対向磁石6,6およびS−8対向磁石7
.7を交互に多数配設した磁場配向装置に代えて、第4
図で示されるN−N対向磁石6.6を多数並設した磁場
配向装置を使用した以外は、実施例1と同様にして磁気
テープをつくった。Comparative Example 1 In Example 1, the N-N opposing magnets 6, 6 and the S-8 opposing magnet 7 disposed inside and outside the dryer 5 shown in FIG.
.. In place of the magnetic field orientation device in which a large number of 7s are arranged alternately, a 4th
A magnetic tape was produced in the same manner as in Example 1, except that a magnetic field orientation device in which a large number of N--N opposing magnets 6.6 were arranged in parallel as shown in the figure was used.
比較例2
実施例1において、乾燥機5内外に配設されたN−N対
向磁石6.6およびS−S対向磁石7゜7を省いた以外
は、実施例1と同様にして磁気テープをつくった。Comparative Example 2 A magnetic tape was produced in the same manner as in Example 1, except that the N-N opposing magnets 6.6 and the S-S opposing magnets 7°7 disposed inside and outside the dryer 5 were omitted. I made it.
各実施例および比較例で得られた磁気テープについて、
保磁力、残留磁束密度、最大残留磁束密度、角型、周波
数31511zにおける出力、周波数12.5KHzに
おける出力、周波数3151−1zにおける最大出力レ
ベル(歪率3%)、周波数10Kllzにおける飽和レ
ベルを測定した。測定値は比較例1で得られた磁気テー
プを基準(OdB)とし、これとの相対値で表した。Regarding the magnetic tapes obtained in each example and comparative example,
Coercive force, residual magnetic flux density, maximum residual magnetic flux density, square shape, output at frequency 31511z, output at frequency 12.5KHz, maximum output level (distortion rate 3%) at frequency 3151-1z, saturation level at frequency 10Kllz were measured. . The measured values were expressed as relative values with respect to the magnetic tape obtained in Comparative Example 1 as a reference (OdB).
下記第1表はその結果である。Table 1 below shows the results.
第 1 表
〔発明の効果〕
上表から明らかなように、この発明の方法で得られた磁
気テープは、従来の方法で得られた磁気テープに比し、
残留磁束密度および角型が高くて、出力が高く、このこ
とからこの発明方法によれば、磁性粉末粒子の配向が良
好に行われ、電磁変換特性に優れた磁気記録媒体が得ら
れることがわかる。Table 1 [Effects of the Invention] As is clear from the above table, the magnetic tape obtained by the method of the present invention has a lower magnetic tape than the magnetic tape obtained by the conventional method.
The residual magnetic flux density and square shape are high, and the output is high. This shows that according to the method of this invention, the magnetic powder particles are well oriented and a magnetic recording medium with excellent electromagnetic conversion characteristics can be obtained. .
第1図はこの発明の磁気テープの製造工程の概略を示す
説明図、第2図は第1図に示した磁気テープの製造工程
における磁界の強さの分布図、第3図および第4図は従
来の磁気テープの製造工程の概略を示す説明図、第5図
は第4図に示した磁気テープの製造工程における磁界の
強さの分布図である。
2・・・ベースフィルム(基体)、3・・・コーティン
グヘッド、4・・・磁性塗膜、5・・・乾燥機、6・・
・N−N対向磁石、7・・・S−S対向磁石
第 3 図FIG. 1 is an explanatory diagram showing an outline of the manufacturing process of the magnetic tape of the present invention, FIG. 2 is a distribution diagram of the magnetic field strength in the manufacturing process of the magnetic tape shown in FIG. 1, and FIGS. 3 and 4. 5 is an explanatory diagram showing an outline of a conventional magnetic tape manufacturing process, and FIG. 5 is a distribution diagram of magnetic field strength in the magnetic tape manufacturing process shown in FIG. 4. 2... Base film (substrate), 3... Coating head, 4... Magnetic coating film, 5... Dryer, 6...
・N-N opposing magnet, 7...S-S opposing magnet Fig. 3
Claims (1)
塗料中に含まれる磁性粉末の保磁力より高い磁界強度を
もつN−N反発磁界とS−S反発磁界とを交互に少なく
とも一組以上並設した磁界中に導入して走行させ、磁性
塗料を徐々に硬化させながら、走行する基体上の磁性塗
料中に含まれる磁性粉末粒子に正負交互に磁界を作用さ
せて、基体の走行に伴って前記磁性粉末粒子に作用する
正から負または負から正に反転する磁界の反転を、磁性
粉末粒子がこの磁界反転の作用で回転を開始する前に終
了させ、磁性粉末粒子を回転することなく、磁性粉末粒
子の磁化の方向のみを反転させて、磁性粉末粒子の磁化
容易軸を基体の走行方向に配向させることを特徴とする
磁気記録媒体の製造方法1. Apply a magnetic paint onto a substrate, and then apply at least one N-N repulsive magnetic field and an S-S repulsive magnetic field alternately, each having a magnetic field strength higher than the coercive force of the magnetic powder contained in the magnetic paint. The magnetic powder particles contained in the magnetic paint on the moving substrate are applied with alternating positive and negative magnetic fields while the magnetic paint is gradually hardened by introducing the magnetic paint into a magnetic field arranged in parallel with the substrate. The reversal of the magnetic field that is reversed from positive to negative or from negative to positive, which acts on the magnetic powder particles as a result of the reversal of the magnetic powder particles, is terminated before the magnetic powder particles start rotating due to the effect of this magnetic field reversal, and the magnetic powder particles are rotated. A method for manufacturing a magnetic recording medium, which comprises reversing only the direction of magnetization of the magnetic powder particles to orient the axis of easy magnetization of the magnetic powder particles in the running direction of the substrate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61087466A JPH0740361B2 (en) | 1986-04-16 | 1986-04-16 | Method of manufacturing magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61087466A JPH0740361B2 (en) | 1986-04-16 | 1986-04-16 | Method of manufacturing magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62243129A true JPS62243129A (en) | 1987-10-23 |
JPH0740361B2 JPH0740361B2 (en) | 1995-05-01 |
Family
ID=13915671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61087466A Expired - Lifetime JPH0740361B2 (en) | 1986-04-16 | 1986-04-16 | Method of manufacturing magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0740361B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0223524A (en) * | 1988-07-12 | 1990-01-25 | Hitachi Maxell Ltd | Method and apparatus for producing magnetic recording medium |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5177202A (en) * | 1974-12-26 | 1976-07-05 | Shinetsu Chemical Co | Jikiteepuyo teihokojibahatsuseisochi |
JPS5194805A (en) * | 1975-02-19 | 1976-08-19 | Jikikirokubaitaino seizohoho | |
JPS52141612A (en) * | 1976-05-20 | 1977-11-26 | Hitachi Maxell | Method of producing magnetic recording media |
JPS6022416A (en) * | 1983-07-15 | 1985-02-04 | 松下電工株式会社 | Machine safety breaker |
JPS6061923A (en) * | 1983-09-14 | 1985-04-09 | Hitachi Ltd | Production of magnetic recording medium |
-
1986
- 1986-04-16 JP JP61087466A patent/JPH0740361B2/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5177202A (en) * | 1974-12-26 | 1976-07-05 | Shinetsu Chemical Co | Jikiteepuyo teihokojibahatsuseisochi |
JPS5194805A (en) * | 1975-02-19 | 1976-08-19 | Jikikirokubaitaino seizohoho | |
JPS52141612A (en) * | 1976-05-20 | 1977-11-26 | Hitachi Maxell | Method of producing magnetic recording media |
JPS6022416A (en) * | 1983-07-15 | 1985-02-04 | 松下電工株式会社 | Machine safety breaker |
JPS6061923A (en) * | 1983-09-14 | 1985-04-09 | Hitachi Ltd | Production of magnetic recording medium |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0223524A (en) * | 1988-07-12 | 1990-01-25 | Hitachi Maxell Ltd | Method and apparatus for producing magnetic recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPH0740361B2 (en) | 1995-05-01 |
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