JPH0562183A - Manufacture of magnetic recording medium - Google Patents
Manufacture of magnetic recording mediumInfo
- Publication number
- JPH0562183A JPH0562183A JP24822391A JP24822391A JPH0562183A JP H0562183 A JPH0562183 A JP H0562183A JP 24822391 A JP24822391 A JP 24822391A JP 24822391 A JP24822391 A JP 24822391A JP H0562183 A JPH0562183 A JP H0562183A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- recording medium
- magnetic recording
- coating head
- pipe
- 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
Landscapes
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は磁気記録媒体の製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic recording medium.
【0002】[0002]
【従来の技術】磁気記録媒体を製造するにあたっては、
分散された塗料と硬化剤を最終段階で混合し、ろ過処理
を行った後、この混合塗料を塗布ヘッドへ送液し、塗布
を行いテープあるいはディスクといった磁気記録媒体を
得る工程となっている。近頃は、媒体の狭トラック化に
よる長時間化あるいは高密度化が進められ、媒体化した
後に残る分散不良物や再凝集によるドロップアウトの対
象となるサイズが一段と細かくなる傾向にある。塗布ヘ
ッドへの送液に際しては、前述の分散不良物や再凝集物
を取り除くため、数段回にわたってろ過処理が施される
のであるが、その最終段階で硬化剤が混合された塗料に
ついては、分散物の再凝集自体よりも塗布ヘッドへの送
液系における局所での滞留が問題となる。つまり、送液
系配管中に継手部が存在し、その内壁部分に段差がある
と、そのポイントで硬化剤が混合された塗料が流れない
部分、すなわち塗料がよどむ所が存在する。こういった
ところでは、塗料の流動が停滞するデッドポイントにな
るわけで、しかも硬化剤が混合された後のため、塗料自
体の硬化による凝集塊となるのである。2. Description of the Related Art In manufacturing a magnetic recording medium,
In the final step, the dispersed coating material and curing agent are mixed and filtered, and then the mixed coating material is sent to a coating head and coated to obtain a magnetic recording medium such as a tape or a disk. Recently, as the media have been made narrower and the time has become longer or the densities have been made higher, the size of the defective dispersion remaining after the media has become smaller or the size of the dropout due to re-aggregation tends to become much finer. At the time of sending the liquid to the coating head, in order to remove the above-mentioned poor dispersion and reaggregation, filtration treatment is performed several times, but for the paint in which the curing agent is mixed at the final stage, The local retention in the liquid feeding system to the coating head becomes a problem rather than the reaggregation of the dispersion itself. That is, if there is a joint in the liquid supply system pipe and there is a step in the inner wall portion, there is a portion where the paint mixed with the curing agent does not flow, that is, a portion where the paint stagnates at that point. In such a place, it becomes a dead point where the flow of the coating is stagnant, and since it is after the curing agent is mixed, it becomes an agglomerate due to the curing of the coating itself.
【0003】[0003]
【発明が解決すべき課題】塗布には様々なタイプの塗布
方式が用いられているが、押出し型塗布ヘッドを用いた
方式による塗布の場合は、その塗布ヘッド自体、特にそ
の凝集物(凝集塊)の影響を受やすい構造で、凝集塊が
スリットで引っかかったりしやすくこれが原因でスジを
発生するなどドロップアウトの問題のみならず、原反で
の歩留りにも影響が出てしまっていた。Although various types of coating methods are used for coating, in the case of coating by a method using an extrusion type coating head, the coating head itself, especially its agglomerates (aggregated lumps) is used. ), The agglomerates tend to get caught in the slits, which causes streaks, which not only causes dropouts, but also affects the yield of the original fabric.
【0004】[0004]
【課題を解決するための手段】このような現象は、配管
系に存在する内壁段差部分で塗料のよどみが存在し、特
に硬化剤混合後、最終フィルター処理を施した後の配管
系でそのような部分が存在すると、時間と共にその硬化
による凝集物は増加し、影響が大となるのである。しか
も蓄積と同時に剥離あるいは脱離が生じ、このような塗
布ヘッドへの最終送液系で段差部が存在するような配管
だとドロップアウトあるいは押出し型塗布ヘッドを用い
た場合のスジを発生することで適さないことがわかっ
た。そこで、このような現象を回避するため塗布ヘッド
への最終ろ過器以降の配管を、段差が無い施工法で対処
したところドロップアウトの低減や押出し型塗布ヘッド
を用いた場合のスジが減少することが判明した。具体的
には、従来、配管の接続部でねじ込み式の継手が用いら
れており、図1に示すようにねじ込み部の接続部分にお
いて塗料のよどみ点が存在する。本発明においては、図
2に示すようなよどみ点を発生しない継手にすべて変更
した。すなわち、図2において1は管、2は突合せフラ
ンジ、3はパッキング、4はクランプである。[Means for Solving the Problems] Such a phenomenon is caused by the stagnation of the paint in the step portion of the inner wall existing in the piping system, especially in the piping system after the final filtering treatment after mixing the curing agent. If such a portion is present, the agglomerates due to the hardening increase with time and the influence becomes large. Moreover, peeling or desorption occurs at the same time as the accumulation, and a dropout or a streak when using an extrusion type coating head may occur if the pipe has a step in the final liquid feeding system to the coating head. I found it not suitable. Therefore, in order to avoid such a phenomenon, when the piping after the final filter to the coating head is dealt with by a stepless construction method, dropout is reduced and streaks when using an extrusion type coating head are reduced. There was found. Specifically, conventionally, a screw-in type joint is used at the connecting portion of the pipe, and as shown in FIG. 1, there is a stagnation point of the paint at the connecting portion of the screwing portion. In the present invention, all of the joints shown in FIG. 2 have no stagnation point. That is, in FIG. 2, 1 is a tube, 2 is a butt flange, 3 is packing, and 4 is a clamp.
【0005】[0005]
【実施例の説明】実施例および比較例を説明する。Description of Examples Examples and comparative examples will be described.
【0006】(実施例1)下記に示される配合比で磁性
塗料を調整し、押出し型塗布ヘッドによる塗布を行い実
験を行った。 重量部 磁性粉 100 平均長径:0.2 μm 平均軸比:8 Hc :1500 Oe σs :130 emu/g 塩化ビニル−酢酸ビニル−ビニルアルコール共重合体 10 (UCC製VAGH) ポリウレタン樹脂(日本ポリウレタン製N−2304) 10 研磨材 :アルミナ 10 ステアリン酸 0.2 レシチン 0.5 トルエン 50 メチルエチルケトン 50 メチルイソブチルケトン 50 この塗料を循環ろ過した後、硬化剤として低分子ポリイ
ソシアネート(日本ポリウレタン製コロネートL)を磁
性粉に対して5重量部混合して塗布ヘッドに送液を行っ
た。この時、配管系は本発明の内壁部分に段差がないも
のを使用した。(Example 1) An experiment was conducted by preparing a magnetic coating material with the following compounding ratio and applying it with an extrusion type coating head. Weight part Magnetic powder 100 Average major axis: 0.2 μm Average axial ratio: 8 Hc: 1500 Oe σ s : 130 emu / g Vinyl chloride-vinyl acetate-vinyl alcohol copolymer 10 (UCGH VAGH) Polyurethane resin (Nippon Polyurethane) N-2304) 10 Abrasives: Alumina 10 Stearic acid 0.2 Lecithin 0.5 Toluene 50 Methyl ethyl ketone 50 Methyl isobutyl ketone 50 After circulating and filtering this paint, low molecular weight polyisocyanate (Coronate L made by Nippon Polyurethane) as a curing agent. Was mixed with 5 parts by weight of the magnetic powder and liquid was fed to the coating head. At this time, the piping system used was one having no step on the inner wall portion of the present invention.
【0007】(比較例1)塗布ヘッドへの送液配管系の
継手部は従来のねじ込み式のものを用いた以外は、実施
例1と同じにして塗布を行った。なお、実施例1、比較
例1どちらの場合も実験前に塗布ヘッドへの送液配管系
は充分に洗浄を行ってあり、初期の段階では内部に付着
物、凝集物等は、なかった条件で実験を行った。結果を
表1に送液開始からの時間とドロップアウトの個数、ス
ジの発生の有無を示す。(上段はドロップアウト個数、
下段はスジの発生の有無)(Comparative Example 1) Coating was carried out in the same manner as in Example 1 except that the conventional screw-in type joint was used for the liquid feeding piping system to the coating head. In both cases of Example 1 and Comparative Example 1, the liquid feeding piping system to the coating head was thoroughly washed before the experiment, and there were no deposits, aggregates, etc. inside at the initial stage. I did an experiment. The results are shown in Table 1 showing the time from the start of liquid feeding, the number of dropouts, and the presence or absence of streaks. (The upper row shows the number of dropouts,
(The bottom row shows the occurrence of streaks)
【0008】[0008]
【表1】 ドロップアウトについては、サンプルを8mm幅に切断
し、8mmカセットに組込んで、ドロップアウトレベル
−12dB,15μsで測定した1分あたりの個数であ
る。[Table 1] Regarding the dropout, the number of pieces per minute measured at a dropout level of -12 dB and 15 µs after cutting the sample into a width of 8 mm, incorporating the sample in an 8 mm cassette.
【0009】実施例1のものについては、時間が経過し
てもドロップアウトの個数は変化せず、また、塗布スジ
の発生も無く良好な塗布が行えたが、比較例1の場合に
は、初期は良好であったが、時間の経過とともに硬化凝
集塊が配管内で発生、蓄積しドロップアウト個数増加な
らびにスジの発生がみられ実験終了後、押出し塗布ヘッ
ドを分解したところスリットの入口部分に塗料の硬化凝
集塊が引っかかっていた。In the case of Example 1, the number of dropouts did not change with the passage of time, and good coating could be performed without the occurrence of coating stripes. In the case of Comparative Example 1, however, Initially it was good, but over time, hardened agglomerates were generated and accumulated in the pipe, the number of dropouts increased and streaks were observed.After the experiment was completed, the extrusion coating head was disassembled and at the entrance of the slit. The hardened agglomerates of the paint were caught.
【0010】[0010]
【発明の効果】以上のように本発明の塗布ヘッドへの送
液配管を用いれば、塗料の硬化による凝集塊の発生もな
く蓄積もなく良好な塗布が行える。また、配管系内部に
よどみ点が存在しないので、洗浄も容易であることも明
らかである。また、実施例1および比較例1で用いた押
出し型塗布ヘッドを用いる塗布方法では特にスリット入
口での凝集塊の影響が出やすいため有利である。As described above, by using the liquid supply pipe for the coating head of the present invention, good coating can be performed without the generation or accumulation of aggregates due to the curing of the coating material. It is also clear that cleaning is easy because there are no stagnation points inside the piping system. In addition, the coating method using the extrusion coating head used in Example 1 and Comparative Example 1 is particularly advantageous because the influence of agglomerates at the slit entrance is likely to occur.
【図1】従来の配管の継手を示す。FIG. 1 shows a conventional piping joint.
【図2】本発明の磁性塗料用配管の継手を示す。FIG. 2 shows a joint of a magnetic paint pipe of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 片井 一夫 東京都中央区日本橋一丁目13番1号テイー デイーケイ株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuo Katai 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation
Claims (1)
にあたり、最終フィルターでろ過処理後、送液に用いら
れる配管系において、配管を接続する管内壁部分に段差
がないことを特徴とする磁気記録媒体の製造方法。1. A method of feeding a coating solution to an extrusion type coating head, wherein after a filtering process with a final filter, in the piping system used for feeding the solution, there is no step in the inner wall portion of the tube connecting the piping. Manufacturing method of magnetic recording medium.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24822391A JPH0562183A (en) | 1991-09-02 | 1991-09-02 | Manufacture of magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24822391A JPH0562183A (en) | 1991-09-02 | 1991-09-02 | Manufacture of magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0562183A true JPH0562183A (en) | 1993-03-12 |
Family
ID=17175010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24822391A Pending JPH0562183A (en) | 1991-09-02 | 1991-09-02 | Manufacture of magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0562183A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6043356A (en) * | 1995-03-10 | 2000-03-28 | Otsuka Kagaku Kabushiki Kaisha | Process for preparing β-lactam compound |
-
1991
- 1991-09-02 JP JP24822391A patent/JPH0562183A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6043356A (en) * | 1995-03-10 | 2000-03-28 | Otsuka Kagaku Kabushiki Kaisha | Process for preparing β-lactam compound |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20000808 |