JPH04147432A - Production of magnetic recording medium - Google Patents
Production of magnetic recording mediumInfo
- Publication number
- JPH04147432A JPH04147432A JP27394290A JP27394290A JPH04147432A JP H04147432 A JPH04147432 A JP H04147432A JP 27394290 A JP27394290 A JP 27394290A JP 27394290 A JP27394290 A JP 27394290A JP H04147432 A JPH04147432 A JP H04147432A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- web
- magnetic layer
- recording medium
- thermosetting treatment
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005498 polishing Methods 0.000 claims abstract description 8
- 239000006247 magnetic powder Substances 0.000 claims abstract description 7
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000003490 calendering Methods 0.000 claims abstract description 6
- 238000001723 curing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 2
- 238000013007 heat curing Methods 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 abstract description 6
- 229920001187 thermosetting polymer Polymers 0.000 abstract 4
- 239000011248 coating agent Substances 0.000 abstract 3
- 238000000576 coating method Methods 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 23
- 230000003746 surface roughness Effects 0.000 description 8
- 239000002344 surface layer Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 235000021313 oleic acid Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 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
本発明は、磁性粉を結合剤中に分散してなる塗布型磁気
記録媒体の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a coated magnetic recording medium in which magnetic powder is dispersed in a binder.
従来の技術
近年、オーディオ用、ビデオ用、コンピュータ用等の磁
気記録媒体として、磁気テープの需要が多く、同時にま
た、磁気テープ自体の電磁変換特性の向上、いわゆる高
密度記録化が進み、高周波数帯域で高電磁変換特性（高
出力、高Ｃ／Ｎ ）を求められるようになってきた。そ
のためにより微細な磁性粉を結合剤用に高分散させ、場
合に応して、潤滑剤、研磨剤、カーボン等を配合したの
ち、硬化剤を添加して充分に分散した磁性塗料を非磁性
支持体上の一面に均一に塗布、配向し１次いでカレンダ
ー処理を行なったのちに巻回し、得られたロール状の原
反を所定の硬化条件（時間と温度）で磁性層を硬化させ
、さらに磁性層を形成した裏面に、磁気テープの走行性
を確保するための所定のバックコート層を設け、さらに
磁性層表面を研磨テープでバーニッシュしたのち、所定
のテープ幅にスリットして磁気テープを作成していた。2. Description of the Related Art In recent years, there has been a great demand for magnetic tapes as magnetic recording media for audio, video, computers, etc. At the same time, the electromagnetic conversion characteristics of magnetic tapes themselves have been improved, so-called high-density recording has progressed, and high frequency High electromagnetic conversion characteristics (high output, high C/N) are now required in the band. To achieve this, finer magnetic powder is highly dispersed as a binder, and as the case requires, lubricants, abrasives, carbon, etc. are added, and a hardening agent is added to fully disperse the magnetic paint onto a non-magnetic support. The magnetic layer is uniformly coated and oriented on one surface of the body, then calendered and then rolled up. A predetermined back coat layer is provided on the back side of the layered layer to ensure the running properties of the magnetic tape, and after the surface of the magnetic layer is burnished with abrasive tape, the tape is slit to a predetermined tape width to create a magnetic tape. Was.
発明が解決しようとする課題
高出力、高Ｃ／Ｎを得るためには、微粒子磁性粉を含有
する磁性層表面の表面粗度を小さくすることが必要であ
りカレンダー処理により達成される。しかし、磁性層の
表面粗度を小さくすると、その反作用として磁性層の摩
擦係数（μｋ）が高くなり、時として磁気テープの走行
安定性に欠ける。上記の従来の磁気テープの製造方法で
は、硬化処理後の原反の中心部と外周部において、磁性
層の表面粗さが同じであるにもかかわらず中心部の摩擦
係数（μｋ）が高く、原反の外周部でμｋが低く、いわ
ゆるμにの傾斜を持つ磁気テープとなり、長尺原反はど
、その傾向が大きくなり磁気テープの製造上の歩留りの
低下という問題を生じていた。Problems to be Solved by the Invention In order to obtain high output and high C/N, it is necessary to reduce the surface roughness of the surface of the magnetic layer containing fine magnetic powder, and this can be achieved by calendering. However, when the surface roughness of the magnetic layer is reduced, the friction coefficient (μk) of the magnetic layer increases as a reaction, and the running stability of the magnetic tape is sometimes impaired. In the above-mentioned conventional magnetic tape manufacturing method, although the surface roughness of the magnetic layer is the same in the center and the outer circumference of the original fabric after curing, the coefficient of friction (μk) in the center is high; μk is low at the outer periphery of the raw material, resulting in a magnetic tape having a so-called μ inclination, and this tendency becomes greater as the length of the raw material becomes longer, resulting in a problem of decreased yield in the production of magnetic tapes.
本発明は、上記課題を解決するものであって、長尺原反
にしても、原反の中心部と外周部でμｋがほぼ等しく磁
気テープの製造歩留りを向上させる製造方法を提供する
ものである。The present invention solves the above problems, and provides a manufacturing method that improves the manufacturing yield of magnetic tapes, in which μk is almost equal between the center and the outer circumference of the tape, even when the tape is long. be.
課題を解決するための手段
本発明は上記問題点を解決するために、非磁性支持体の
一面に、結合剤中に磁性粉を含む磁性塗料を塗布し、配
向、カレンダー処理、乾燥処理工程を経て巻回された原
反を熱硬化処理する工程において、全硬化時間の２分の
１が経過したのち巻き替えを行ない、再び硬化する工程
と、磁性層の表面研磨を行なう工程を含むことを特徴と
する磁気記録媒体の製造方法で磁気記録媒体の歩留を向
上できる。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention applies a magnetic paint containing magnetic powder in a binder to one surface of a non-magnetic support, and then performs orientation, calendering, and drying steps. The process of heat-curing the rolled original fabric includes a process of rewinding and curing again after one-half of the total curing time has elapsed, and a process of surface polishing the magnetic layer. The characterized method for manufacturing magnetic recording media can improve the yield of magnetic recording media.
作用
本発明の上記記載の磁気記録媒体の製造方法により、長
尺原反の中心部と外周部のμｋに傾斜がなく、磁気テー
プとした時の歩留りの向上につながるものであり、以下
に具体的作用について説明する。Function: According to the method for manufacturing a magnetic recording medium of the present invention described above, there is no inclination in μk between the center and the outer periphery of the long raw material, leading to an improvement in the yield when it is made into a magnetic tape. Explain the effect of
本発明は微粒子磁性粉を用いて結合剤中に充分分散させ
た磁性塗料を非磁性支持体の一面に塗布し、配向、乾燥
して、カレンダー処理により、表面粗さの低減を図るが
、高い出力、高いＣ／Ｎを得るためには、相当、表面粗
さを小さくする必要があり、そのために必然的にμｋが
高くなる傾向にある。μｋを低下させる方法として従来
よりステアリン酸、ミリスチン酸、オレイン酸等の脂肪
酸を磁性層中に添加し、磁性層表面へ移行させ、表面粗
度が小さくても磁性層のμｋを低くすることができる事
実に基づいて鋭意検討した結果なされたもので、磁性層
表面への潤滑剤の移行を、硬化後の原反の中心部と外周
部で、同程度にすることが必要であり、本発明のように
全硬化時間の２分の１が経過した時点で巻き替えし、さ
らに硬化を続けることにより原反の中心部と外周部の磁
性層表層における潤滑剤濃度を同程度にすることができ
る。このことは従来の硬化法では原反の中心部では硬化
時に熱の伝播が充分でなく潤滑剤の表層移行が充分に行
なわれないが、本発明のように巻き替えを行なうことに
より表層移行が促進されるためと考えられる。また、本
発明のように、磁性層の表面研磨を行なうのは、ドロッ
プアウトの低減効果の他に、磁性層表層に移行している
潤滑剤を、研磨テープで磁性層表面を研磨することによ
り表面へ浮き出させるためである。In the present invention, a magnetic paint sufficiently dispersed in a binder using fine magnetic powder is applied to one surface of a non-magnetic support, oriented, dried, and calendered to reduce surface roughness. In order to obtain high output and high C/N, it is necessary to considerably reduce the surface roughness, which inevitably tends to increase μk. As a conventional method for lowering μk, fatty acids such as stearic acid, myristic acid, and oleic acid are added to the magnetic layer and transferred to the surface of the magnetic layer, thereby lowering the μk of the magnetic layer even if the surface roughness is small. This was made as a result of intensive study based on the fact that it is necessary to make the lubricant transfer to the surface of the magnetic layer to the same extent at the center and the outer periphery of the original fabric after hardening. By rewinding the film after half of the total curing time has elapsed and continuing curing, the lubricant concentration in the magnetic layer surface layer at the center and the outer periphery of the web can be made to be about the same. . This means that in the conventional curing method, heat propagation is not sufficient in the center of the original fabric during curing, and the lubricant does not transfer to the surface layer sufficiently, but by rewinding as in the present invention, transfer to the surface layer is prevented. This is thought to be because it is promoted. In addition, in addition to the effect of reducing dropouts, surface polishing of the magnetic layer as in the present invention removes the lubricant that has migrated to the surface layer of the magnetic layer by polishing the surface of the magnetic layer with an abrasive tape. This is to make it stand out on the surface.
以上説明したように、本発明の硬化工程における原反の
巻き替えと、磁性層表層の研磨によりμｋが低い値で安
定化し製造歩留りが向上する。As explained above, by rewinding the original fabric in the curing process of the present invention and polishing the surface layer of the magnetic layer, μk is stabilized at a low value and the manufacturing yield is improved.
以下に本発明の実施例を示して説明する。Examples of the present invention will be shown and explained below.
実施例
実施例１
第１表に示した磁性塗料組成物を混線材およびサンドミ
ルを用いて均一に分散させた磁性塗料に硬化剤としてコ
ロネートしく日本ポリうレタン工業製）を配合し、非磁
性支持体として１０．ｃＩｍ厚のポリエチレンテレフタ
レートフィルム（ＰＥＴ）の−面にグラビアロール法に
より均一に３．５μｍ厚になるよう塗工し、配向処理し
、乾燥処理してロール状に巻回された２０００ｍの原反
を６０’Ｃで１２時間硬化したのち、原反の中心部が外
側になるように巻き替えを行ない、さらに６０’Ｃで１
２時間硬化したのち、所定のバックコート層を形成した
。次いで得られた厚反をＧＣ−８０００番の研磨テープ
を用い５回研磨（バーニッシュ）したのち、２インチ幅
にスリットしてパンケーキ状の磁気テープを得た。Examples Example 1 The magnetic paint composition shown in Table 1 was uniformly dispersed using a wire mixer and a sand mill.Coronate (manufactured by Nippon Polyurethane Industries) was added as a hardening agent to the magnetic paint, and a non-magnetic support was added. 10. As a body. A 2,000 m long raw film was coated on the - side of cIm thick polyethylene terephthalate film (PET) to a thickness of 3.5 μm using a gravure roll method, oriented, dried and wound into a roll. After curing at 60'C for 12 hours, the original fabric was re-wound so that the center was on the outside, and then cured at 60'C for 12 hours.
After curing for 2 hours, a predetermined back coat layer was formed. Next, the obtained thick film was burnished five times using a GC-8000 abrasive tape, and then slit into a 2-inch width to obtain a pancake-shaped magnetic tape.
（以 下 余 白）
第１表
実施例２
全硬化時間を６０℃で１２時間とした以外は実施例と全
く同様の方法でパンケーキ状の磁気テープを得た。(Margin below) Table 1 Example 2 A pancake-shaped magnetic tape was obtained in exactly the same manner as in the example except that the total curing time was 12 hours at 60°C.
比較例１
実施例に使用した磁性塗料を用いて従来通り６０°Ｃで
２４時間硬化したのちバックコート層を形成し、次いで
Ａインチ幅にスリットしてパンケーキ状の磁気テープを
得た。Comparative Example 1 The magnetic paint used in the example was cured at 60° C. for 24 hours in the conventional manner to form a back coat layer, and then slit to an A inch width to obtain a pancake-shaped magnetic tape.
比較例２
比較例１と同様に６０°Ｃで２４時間硬化したのち、バ
ックコート層を形成し、ＧＣ−８０００番の研磨テープ
を用いて研磨し、Ａインチ幅にスリットしてパンケーキ
状の磁気テープを得た。Comparative Example 2 After curing at 60°C for 24 hours in the same manner as Comparative Example 1, a back coat layer was formed, polished using a GC-8000 polishing tape, and slit into A-inch width to form a pancake-like shape. Obtained magnetic tape.
以上得られた磁気テープの緒特性を第２表に示す。Table 2 shows the characteristics of the magnetic tape obtained above.
（以 下 余 白） また、その評価法を以下に示す。(Hereafter, extra white) Moreover, the evaluation method is shown below.
（１）表面粗度：触針式表面粗度計（クリステップ：テ
ーラーホブソン社製）を用いて磁気記録媒体の磁性層表
面の中心平均粗さ（Ｒａ値）を測定した。(1) Surface roughness: The center average roughness (Ra value) of the magnetic layer surface of the magnetic recording medium was measured using a stylus type surface roughness meter (Crystep, manufactured by Taylor Hobson).
（２）摩擦係数（μｋ）ニドローイング方式μに試験機
（松下電器■製）を用いて２０パス後のμｋを測定した
。(2) Coefficient of friction (μk) μk was measured after 20 passes using a Ni drawing method μ using a testing machine (manufactured by Matsushita Electric).
（３）Ｃ／Ｎ：中心周波数７ＭＨｚで記録再生し、７Ｍ
Ｈｚにおける信号と５ＭＨｚにおけるノイズの比を比較
例２の外周部のＣ／ＮをＯｄＢとした時の相対値で示し
た。ＶＴＲとしてＡＵ６５０（松下電器■製）を使用し
た。(3) C/N: Record and playback at a center frequency of 7MHz, 7M
The ratio of the signal at Hz to the noise at 5 MHz is shown as a relative value when the C/N of the outer peripheral portion of Comparative Example 2 is set to OdB. AU650 (manufactured by Matsushita Electric) was used as a VTR.
発明の効果
以上実施例から明らかなように本発明の磁気記録媒体の
製造方法によれば磁性層の摩擦係数の低い走行性の優れ
た磁気記録媒体が得られる。Effects of the Invention As is clear from the Examples above, according to the method of manufacturing a magnetic recording medium of the present invention, a magnetic recording medium with a low coefficient of friction of the magnetic layer and excellent running properties can be obtained.
Claims (1)
料を塗布し、配向、カレンダー処理、乾燥処理工程を経
て巻回された原反を熱硬化処理する工程において、全硬
化時間の２分の１が経過したのち巻き替えを行ない、再
び硬化する工程と、磁性層の表面研磨を行なう工程を含
むことを特徴とする磁気記録媒体の製造方法。In the process of applying a magnetic paint containing magnetic powder in a binder to one side of a non-magnetic support, and heat-curing the rolled original fabric through orientation, calendering, and drying steps, the total curing time is A method for manufacturing a magnetic recording medium, comprising the steps of rewinding and hardening again after one-half has elapsed, and polishing the surface of the magnetic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27394290A JPH04147432A (en) | 1990-10-11 | 1990-10-11 | Production of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27394290A JPH04147432A (en) | 1990-10-11 | 1990-10-11 | Production of magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04147432A true JPH04147432A (en) | 1992-05-20 |
Family
ID=17534718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27394290A Pending JPH04147432A (en) | 1990-10-11 | 1990-10-11 | Production of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04147432A (en) |
-
1990
- 1990-10-11 JP JP27394290A patent/JPH04147432A/en active Pending
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