JPH01203073A - Applicator of magnetic recording medium - Google Patents
Applicator of magnetic recording mediumInfo
- Publication number
- JPH01203073A JPH01203073A JP2497288A JP2497288A JPH01203073A JP H01203073 A JPH01203073 A JP H01203073A JP 2497288 A JP2497288 A JP 2497288A JP 2497288 A JP2497288 A JP 2497288A JP H01203073 A JPH01203073 A JP H01203073A
- Authority
- JP
- Japan
- Prior art keywords
- film thickness
- width direction
- heating
- coating
- slit
- 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
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims description 36
- 239000011248 coating agent Substances 0.000 claims description 34
- 101700004678 SLIT3 Proteins 0.000 abstract description 5
- 102100027339 Slit homolog 3 protein Human genes 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000007765 extrusion coating Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000007756 gravure coating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、押出し型塗布装置に係り、特に磁気記録媒体
を製造する際、支持体の巾方向に関し均一な膜厚分布を
得ることができる塗布装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an extrusion type coating device, and in particular, when producing a magnetic recording medium, it is possible to obtain a uniform film thickness distribution in the width direction of a support. The present invention relates to a coating device.
コーティング方式としては、ロールコート、グラビアコ
ート、エクストルージョンコート、スライドビードコー
ト、カーテンコート等種々の方式があることはよく知ら
れている。It is well known that there are various coating methods such as roll coating, gravure coating, extrusion coating, slide bead coating, and curtain coating.
磁気記録媒体は、支持体上に磁性塗布液を塗布すること
によって得られるが、その塗布方式としては、ロールコ
ート、グラビアコート、エクストルージョンコートが一
般的である。この中でも、エクストルージョンコートは
、均一な塗布膜厚が得られるので優れている。Magnetic recording media are obtained by coating a magnetic coating liquid on a support, and the coating methods generally include roll coating, gravure coating, and extrusion coating. Among these, extrusion coating is excellent because it provides a uniform coating thickness.
ところで、主として磁気記録媒体の製造を目的としたエ
クストルージョンコート法における従来技術として、特
開昭５７−８４７７１号、同５８−１０４６６６号、同
６０−２３８１７９号公報記載のものが知られている。By the way, as a conventional technique in the extrusion coating method mainly for the purpose of manufacturing magnetic recording media, the techniques described in Japanese Patent Laid-Open Nos. 57-84771, 58-104666, and 60-238179 are known.
塗布によって形成された磁気記録媒体の膜厚の均一性は
、記録・再生特性に大きく影響する。The uniformity of the film thickness of a magnetic recording medium formed by coating greatly affects the recording and reproducing characteristics.
支持体の走行方向の膜厚は、基本的には塗布速度（支持
体の搬送速度）と塗布液の供給速度によって制御できる
。巾方向の膜厚については、支持体のコータヘッドに対
する当り強さが巾方向に関し一定であれば均一となるは
ずであるが、実際には、走行中の支持体には巾方向に関
しテンションが異なり、また支持体に、いわゆる「つれ
」や「シワ」があるため、塗布した場合、膜厚が中方向
で異なることが多い。これでは、品質上もさることなが
ら、歩留りの低下も招く。The film thickness in the running direction of the support can basically be controlled by the coating speed (transport speed of the support) and the supply speed of the coating liquid. The film thickness in the width direction should be uniform if the strength of contact between the support and the coater head is constant in the width direction, but in reality, the tension on the support while it is running varies in the width direction. In addition, because the support has so-called "tangles" or "wrinkles," when coated, the film thickness often differs in the middle direction. This not only improves quality but also reduces yield.
一方、予め膜厚が巾方向で異なることを考慮して、フロ
ントエツジ面およびバックェツジ面を１１方向に不均一
化しておく手段も考えられるが、生産するロフトに応じ
てコータヘッドを変えなければならないし、またあるロ
ット中で膜厚変動要因が加わった場合、これに対処でき
ない。On the other hand, considering that the film thickness differs in the width direction, it is possible to make the front edge surface and back edge surface uneven in 11 directions in advance, but this would require changing the coater head depending on the loft to be produced. However, if film thickness variation factors are added in a particular lot, this cannot be dealt with.
したがって、本発明の主たる目的は、中方向の膜厚分布
を簡易な手段によって均一化できる磁気記録媒体の塗布
装置を提供することにある。Therefore, the main object of the present invention is to provide a coating apparatus for a magnetic recording medium that can uniformize the film thickness distribution in the middle direction by a simple means.
上記課題は、フロントエツジ面およびバックェツジ面に
沿って連続的に走行する可撓性支持体表面に、前記フロ
ントエツジ面とバックェツジ面とのスリットから塗布液
を連続的に押し出して前記支持体表面に塗布液を塗布す
る装置において、前記スリットを通る塗布液を加熱する
加熱手段が巾方向に少くとも３個所区画して設けられ、
それら加熱手段による加熱度がそれぞれ制御可能となっ
ていることで解決できる。The above problem is solved by continuously extruding a coating liquid onto the surface of a flexible support that runs continuously along the front edge surface and the back edge surface through slits between the front edge surface and the back edge surface. In the apparatus for applying a coating liquid, heating means for heating the coating liquid passing through the slit is provided in at least three sections in the width direction,
This problem can be solved by making it possible to control the degree of heating by each heating means.
本発明に従って、スリットを通る塗布液を加熱手段によ
って加熱すると、その分、塗布液の粘度が低下する。粘
度によって塗布膜厚が異なる。したがって、巾方向に少
くとも３個の加熱手段を設け、塗布液に対する加熱度を
制御してやれば、巾方向の膜厚を均一化できる。According to the present invention, when the coating liquid passing through the slit is heated by the heating means, the viscosity of the coating liquid is reduced accordingly. Coating film thickness varies depending on viscosity. Therefore, by providing at least three heating means in the width direction and controlling the degree of heating of the coating liquid, the film thickness in the width direction can be made uniform.
以下本発明をさらに詳説する。 The present invention will be explained in more detail below.
第２図は本発明に係るエクストルーダーコータヘッドＣ
Ｈの要部を例示的に示したもので、上流側表面にフロン
トエツジ面１、下流側表面にバックェツジ面２を有し、
それらの間に塗布液ポケット部（図示せず、同図下方）
に連通ずるスリット３を有している。Figure 2 shows an extruder coater head C according to the present invention.
The main part of H is illustratively shown, and has a front edge surface 1 on the upstream surface and a back edge surface 2 on the downstream surface,
Between them there is a coating liquid pocket (not shown, lower part of the figure)
It has a slit 3 that communicates with the.
一方、このコータヘッドＣＨに対して第１図のように、
その上流側および下流側にサポートロール４，５が配置
され、支持体６は、上流サポートロール４を通って、フ
ロントエツジ面１およびバックェツジ面２に沿った後、
下流サポートロール５を通って、下流へと導かれる。On the other hand, as shown in Fig. 1 for this coater head CH,
Support rolls 4 and 5 are arranged on the upstream and downstream sides thereof, and after the support body 6 passes through the upstream support roll 4 and along the front edge surface 1 and the back edge surface 2,
It passes through the downstream support roll 5 and is guided downstream.
このとき、支持体６の走行方向線よりコータヘッドＣＨ
が突出しているため、逆に支持体６がフロントエツジ面
１およびバックェツジ面２に対して押し付けられる。At this time, from the running direction line of the support body 6, the coater head CH
Because of this protrusion, the support body 6 is conversely pressed against the front edge surface 1 and the back edge surface 2.
本発明では、前記スリット３に直接、またはコータヘッ
ドＣＨ形成部材を介して間接的に臨んで、本発明にいう
加熱手段としての電熱ヒータ等の加熱ヒータ７．７・・
・が、支持体の中方向、すなわちコータヘッドＣＨの巾
方向に、少くとも３個以上、図示例では７個等間隔的に
配設されている。In the present invention, heating heaters 7.7, such as electric heaters, as heating means according to the present invention are provided directly to the slit 3 or indirectly through the coater head CH forming member.
At least three or more (in the illustrated example, seven) are arranged at equal intervals in the middle direction of the support body, that is, in the width direction of the coater head CH.
他方で、コータヘッドＣＨの出側には、Ｘ線膜厚計等の
膜厚計８が設けられ、この膜厚計８による塗布膜厚情報
は演算装置９に取り込まれるようになっている。On the other hand, a film thickness meter 8 such as an X-ray film thickness meter is provided on the exit side of the coater head CH, and coating film thickness information obtained by this film thickness meter 8 is input into an arithmetic unit 9.
この演算装置９では、塗布膜厚信号に基いて、巾方向の
現膜厚分布を均一化すべく、各加熱ヒータ７に付属する
各温度調節器１０に修正信号を出力する。この際、演算
装置９では、現膜厚分布のほか、加熱ヒータ７−・の現
給電量、塗布液の現粘度、塗布液流量、目標膜厚、塗布
速度等を基礎にしながら、修正信号を出力する。Based on the coating film thickness signal, this calculation device 9 outputs a correction signal to each temperature regulator 10 attached to each heater 7 in order to equalize the current film thickness distribution in the width direction. At this time, in addition to the current film thickness distribution, the calculation device 9 generates a correction signal based on the current amount of power supplied to the heater 7-, the current viscosity of the coating liquid, the flow rate of the coating liquid, the target film thickness, the coating speed, etc. Output.
かかるフィードバンク制御によって、膜厚の巾方向分布
を均一化できる。Such feedbank control makes it possible to make the widthwise distribution of the film thickness uniform.
加熱ヒータ７は、もちろんバックェツジ側に設けてもよ
い。スリット３の出口に向う方向に複数設けてもよい。Of course, the heater 7 may be provided on the baggage side. A plurality of them may be provided in the direction toward the exit of the slit 3.
さらに、膜厚は中方向中央と両側とで異なるので、加熱
ヒータは少くとも巾方向に３個必要である。Furthermore, since the film thickness is different between the center and both sides, at least three heaters are required in the width direction.
上記例において、フロントエツジ面１の下流端Ｂにおけ
る接線ａＩより、バックェツジ２の一部が突出（第２図
ではほぼ上方に突出）するのが、種々の塗布故障を防止
する上で好ましい。In the above example, it is preferable for a portion of the back edge 2 to protrude (approximately upward in FIG. 2) from the tangent aI at the downstream end B of the front edge surface 1 in order to prevent various coating failures.
この条件は、前記１１と、下流端Ｂを通りバックェツジ
面２を結ぶ線１３とのなす角度をα２、前記７！１ と
、バックェツジ面２の下流端Ａにおける接線β２となす
角度をα１としたとき、次記−式の条件としてもあられ
すことがきる。This condition is as follows: α2 is the angle between the above 11 and the line 13 that passes through the downstream end B and connects the backwedge surface 2, and α1 is the angle between the above 7!1 and the tangent β2 at the downstream end A of the backwedge surface 2. When, it can also occur as a condition of the following equation.
α２くα＋＜１８０゜
一方、バックエッジ面２の曲率半径ｒは、３〜１０１璽
が好ましし１゜
本発明に係る支持体としては、ポリエステルフィルム等
のプラスチックフィルム、紙、両者の積層シート、金属
シート等を挙げることができ、可撓性材料であればその
材質は問われない。α2×α+<180° On the other hand, the radius of curvature r of the back edge surface 2 is preferably 3 to 101°, and the support according to the present invention may be a plastic film such as a polyester film, paper, or a laminated sheet of both. , a metal sheet, etc., and any material may be used as long as it is flexible.
次に実施例にて本発明の効果を明らかにする。 Next, the effects of the present invention will be clarified in Examples.
支持体として、厚み１５ ｐｍ 、 ｒｌｌ１０００ｍ
ｉ＋のポリエチレンテレフタレートフィルムを用い、メ
タル粉（ＢＥＴ値６０り？／ｇ）を有する２５００ｃｐ
ｓＯ高粘度磁性塗布液を、ウェット膜厚で１５μｍに塗
布し磁気記録媒体シートを得た。As a support, thickness 15 pm, rll 1000 m
2500cp using i+ polyethylene terephthalate film with metal powder (BET value 60?/g)
A magnetic recording medium sheet was obtained by applying an sO high viscosity magnetic coating liquid to a wet film thickness of 15 μm.
この場合、上記本発明に係る図示の塗布装置と、加熱手
段が付属していないことを除いて同一の塗布装置とをそ
れぞれ使用した場合における１１方向の膜厚分布を比較
したところ、第４図の結果を得た。In this case, we compared the film thickness distribution in 11 directions when the illustrated coating apparatus according to the present invention and the same coating apparatus except that the heating means were not attached were used. I got the result.
この結果によると、本発明装置による巾方向膜厚の均一
化効果が明らかである。According to these results, it is clear that the apparatus of the present invention has an effect of making the film thickness uniform in the width direction.
以上の通り、本発明によれば、膜厚の巾方向の均一化を
容易に図ることができる。As described above, according to the present invention, it is possible to easily make the film thickness uniform in the width direction.
第１図は本発明の塗布装置の全体図、第２図はそのコー
タヘッド要部拡大断面図、第３図は加熱ヒータの配置例
の説明図、第４図は巾方向膜厚分布の制御例のグラフで
ある。
１・・・フロントエツジ面、２・・・バックェツジ面、
３・・・スリット、７・・・加熱ヒータ、８・・・膜厚
計、１０・・・温度調節器。Fig. 1 is an overall view of the coating device of the present invention, Fig. 2 is an enlarged cross-sectional view of the main part of the coater head, Fig. 3 is an explanatory diagram of an example of the arrangement of heaters, and Fig. 4 is control of widthwise film thickness distribution. This is an example graph. 1...Front edge surface, 2...Back edge surface,
3... Slit, 7... Heater, 8... Film thickness gauge, 10... Temperature controller.
Claims (1)
連続的に走行する可撓性支持体表面に、前記フロントエ
ッジ面とバックエッジ面とのスリットから塗布液を連続
的に押し出して前記支持体表面に塗布液を塗布する装置
において、 前記スリットを通る塗布液を加熱する加熱手段が巾方向
に少くとも３個所区画して設けられ、それら加熱手段に
よる加熱度がそれぞれ制御可能となっていることを特徴
とする磁気記録媒体の塗布装置。(1) A coating liquid is continuously extruded from the slits between the front edge surface and the back edge surface onto the flexible support surface that runs continuously along the front edge surface and the back edge surface. In the apparatus for applying the coating liquid to the slit, the heating means for heating the coating liquid passing through the slit is provided in at least three sections divided in the width direction, and the degree of heating by the heating means can be controlled individually. Features: Coating device for magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024972A JP2558136B2 (en) | 1988-02-05 | 1988-02-05 | Coating device for magnetic recording media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024972A JP2558136B2 (en) | 1988-02-05 | 1988-02-05 | Coating device for magnetic recording media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01203073A true JPH01203073A (en) | 1989-08-15 |
| JP2558136B2 JP2558136B2 (en) | 1996-11-27 |
Family
ID=12152885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63024972A Expired - Fee Related JP2558136B2 (en) | 1988-02-05 | 1988-02-05 | Coating device for magnetic recording media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2558136B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067730A (en) * | 1992-05-19 | 1994-01-18 | J M Voith Gmbh | Coating device for coating paper web with coloring agent |
| JPH091021A (en) * | 1995-06-14 | 1997-01-07 | Dainippon Printing Co Ltd | Double-side coating apparatus |
| JPH105690A (en) * | 1996-06-27 | 1998-01-13 | Dainippon Printing Co Ltd | Coating method |
| JPH10156255A (en) * | 1996-11-27 | 1998-06-16 | Tokyo Electron Ltd | Coating film forming apparatus |
| JPH10509637A (en) * | 1994-11-23 | 1998-09-22 | アルキャン・インターナショナル・リミテッド | Coating waxy material on moving strips |
| JPH11105227A (en) * | 1997-10-01 | 1999-04-20 | Billhoefer Mas Fab Gmbh | Visible laminate with hot gluing agent |
| JP2000107668A (en) * | 1998-10-05 | 2000-04-18 | Konica Corp | Coater and coating method |
| JP2008110343A (en) * | 2006-10-27 | 2008-05-15 | Nordson Corp | Coater for coating liquid material |
| JP2018114487A (en) * | 2017-01-21 | 2018-07-26 | 東レエンジニアリング株式会社 | Coating apparatus and coating method |
-
1988
- 1988-02-05 JP JP63024972A patent/JP2558136B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067730A (en) * | 1992-05-19 | 1994-01-18 | J M Voith Gmbh | Coating device for coating paper web with coloring agent |
| JPH10509637A (en) * | 1994-11-23 | 1998-09-22 | アルキャン・インターナショナル・リミテッド | Coating waxy material on moving strips |
| JPH091021A (en) * | 1995-06-14 | 1997-01-07 | Dainippon Printing Co Ltd | Double-side coating apparatus |
| JPH105690A (en) * | 1996-06-27 | 1998-01-13 | Dainippon Printing Co Ltd | Coating method |
| JPH10156255A (en) * | 1996-11-27 | 1998-06-16 | Tokyo Electron Ltd | Coating film forming apparatus |
| JPH11105227A (en) * | 1997-10-01 | 1999-04-20 | Billhoefer Mas Fab Gmbh | Visible laminate with hot gluing agent |
| JP2000107668A (en) * | 1998-10-05 | 2000-04-18 | Konica Corp | Coater and coating method |
| JP2008110343A (en) * | 2006-10-27 | 2008-05-15 | Nordson Corp | Coater for coating liquid material |
| JP2018114487A (en) * | 2017-01-21 | 2018-07-26 | 東レエンジニアリング株式会社 | Coating apparatus and coating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2558136B2 (en) | 1996-11-27 |
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