JPH0562180A - Manufacture of magnetic recording medium - Google Patents
Manufacture of magnetic recording mediumInfo
- Publication number
- JPH0562180A JPH0562180A JP3246468A JP24646891A JPH0562180A JP H0562180 A JPH0562180 A JP H0562180A JP 3246468 A JP3246468 A JP 3246468A JP 24646891 A JP24646891 A JP 24646891A JP H0562180 A JPH0562180 A JP H0562180A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- support
- tension
- thickness
- support body
- 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
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
に関し、特に非磁性支持体であるウエブに磁性塗料を均
一に塗布することにより磁気記録媒体を製造方法する方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention 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 by uniformly coating a magnetic coating material on a web which is a non-magnetic support.
【０００２】[0002]
【従来の技術】走行するウェブの背面を支持しない状態
で、支持体ウェブに対して押出し型塗布ヘッドを相対的
に押し付けて塗布する方法においては、図１のように、
前記塗布ヘッド７の前後にバックアップロール５、５’
が設けてある。バックアップロールは、両サイドそれぞ
れ単独に位置調整が可能な機構になっており、その位置
を調整することで塗布液が吐出するスリット出口（リッ
プ）に対し支持体６を均一に押し付けることができる。
均一に押し付けることは、スリットから吐出する塗布液
に均一な吐出抵抗を付加することであり、幅方向厚みを
均一化するための鍵となる。2. Description of the Related Art In a method of applying by pressing an extrusion type coating head relative to a support web without supporting the back surface of a running web, as shown in FIG.
Backup rolls 5 and 5'in front of and behind the coating head 7
Is provided. The backup roll has a mechanism in which the position can be adjusted independently on both sides, and by adjusting the position, the support 6 can be pressed uniformly against the slit outlet (lip) from which the coating liquid is discharged.
The uniform pressing is to add uniform discharge resistance to the coating liquid discharged from the slit, which is a key for making the thickness in the width direction uniform.
【０００３】[0003]
【発明が解決すべき課題】吐出抵抗が位置によって変化
すれば、塗布液は抵抗の小さい位置から吐出し、幅方向
厚みが不均一になる。つまり、リップへの支持体の押し
つけが不均一だと厚みのバラツキにより歩留りの低下が
生じるのである。また、近頃は生産性向上を計るため塗
布速度の高速化、あるいは高密度記録に対しての塗膜厚
の薄層化が進められているが、背面を支持しない状態で
押出し型塗布ヘッドを用いた塗布法においては、高速化
あるいは薄層化する場合、最適な塗布条件を維持するた
めに支持体に加える張力を上げる操作が必要となる。こ
のとき、支持体は、加えられた張力に対して弾性変形を
し、張力の加えられた方向に伸びると同時に幅方向には
縮もうとし、支持体の幅方向に波を打ったような形状に
変化する。この状態が顕著になると、リップに対する支
持体の均一な押し付けができず、局所局所における吐出
抵抗が変化し均一な塗布が不可能となる。押出し型塗布
ヘッドの前後に設けられたバックアップロールの位置を
調整してもこの現象は回避できず、高速化あるいは薄層
化において重要な問題であった。If the discharge resistance changes depending on the position, the coating liquid is discharged from the position where the resistance is small, and the thickness in the width direction becomes uneven. That is, if the support is not pressed against the lip unevenly, the yield will be reduced due to the variation in thickness. In addition, recently, in order to improve productivity, the coating speed has been increased or the coating thickness has been reduced for high density recording, but an extrusion type coating head is used without supporting the back surface. In the coating method described above, when the speed is increased or the layer is thinned, it is necessary to increase the tension applied to the support in order to maintain the optimum coating conditions. At this time, the support elastically deforms in response to the applied tension, expands in the direction in which the tension is applied, and at the same time tries to shrink in the width direction, resulting in a wavy shape in the width direction of the support. Changes to. When this state becomes remarkable, the support cannot be pressed uniformly against the lip, the ejection resistance locally changes, and uniform application becomes impossible. This phenomenon cannot be avoided even if the positions of the backup rolls provided before and after the extrusion type coating head are adjusted, which is an important problem in increasing the speed or reducing the layer thickness.
【０００４】[0004]
【課題を解決するための手段】前述の問題を解決するた
めに種々の検討を重ねた結果、支持体の持つ物性値に合
わせた設定張力範囲内で塗布部張力を設定することで安
定した塗布が行えることが判明した。支持体の幅方向１
ｃｍ当りの塗布部張力Ｔ［ｋｇ／ｃｍ］を、支持体の物
性値によらず下限値０．０６［ｋｇ／ｃｍ］、上限値は
支持体のヤング率Ｅ（ＭＤ方向）［ｋｇ／ｍｍ2 ］に支
持体厚ｔ［ｃｍ］と定数０．７を掛けることで得られる
数値以内に設定することで、前述の問題を改善できるこ
とを見い出した。この条件を守って塗布を行うことで支
持体の波打ち現象の影響はほとんど無視でき、高速化あ
るいは薄層化が図れることがわかった。すなわち、張力
設定式０．０６＜Ｔ＜０．７・Ｅ（ＭＤ）・ｔを満足す
る張力Ｔを採用することによりすぐれた効果が得られ
る。[Means for Solving the Problems] As a result of various studies to solve the above-mentioned problems, stable coating can be achieved by setting the tension of the coating portion within a set tension range according to the physical properties of the support. It turns out that Width direction of support 1
The applied portion tension T [cm / cm] per cm is 0.06 [kg / cm] as the lower limit and the upper limit is the Young's modulus E (MD direction) [kg / mm] of the support, regardless of the physical properties of the support. It has been found that the above problem can be improved by setting the value within a value obtained by multiplying [ 2 ] by the support thickness t [cm] and a constant of 0.7. It was found that the effect of the waviness of the support can be almost ignored by applying the coating under these conditions, and the speed can be increased or the layer can be thinned. That is, an excellent effect can be obtained by adopting the tension T satisfying the tension setting expression 0.06 <T <0.7 · E (MD) · t.
【０００５】[0005]
（実施例１）ビデオ用塗料（固形分濃度４５％、せん断
速度３０００［ｌ／ｓ］における見かけ粘度１７０ｃ
ｐ）を乾燥後の膜厚が３．５μｍとなるように、ヤング
率（ＭＤ）５５０ｋｇ／ｍｍ2 、厚み１４×１０-4［ｃ
ｍ］、支持体幅５２０ｍｍの支持体上に塗布速度６００
ｍ／ｍｉｎで塗布した。この時、塗布部張力を０．０６
ｋｇ／ｃｍとして設定した。(Example 1) Video coating material (solid content concentration 45%, apparent viscosity 170c at shear rate 3000 [l / s])
p) so that the film thickness after drying is 3.5 μm, Young's modulus (MD) 550 kg / mm 2 , thickness 14 × 10 −4 [c
m], coating speed 600 on a support having a support width of 520 mm
It was applied at m / min. At this time, apply tension of 0.06
It was set as kg / cm.
【０００６】（実施例２）塗布部張力を０．５３ｋｇ／
ｃｍとして設定し、塗布を行った。(Example 2) The tension of the coating portion is 0.53 kg /
It was set as cm and applied.
【０００７】（比較例１）塗布部張力を０．０５ｋｇ／
ｃｍとして設定し、塗布を行った。(Comparative Example 1) The tension of the coating portion is 0.05 kg /
It was set as cm and applied.
【０００８】（比較例２）塗布部張力を０．５５ｋｇ／
ｃｍとして設定し、塗布を行った。(Comparative Example 2) The tension of the coating portion was 0.55 kg /
It was set as cm and applied.
【０００９】（実施例３）同じ塗料を用い、ヤング率
（ＭＤ）１５００ｋｇ／ｍｍ2 、厚み１０×１０-4［ｃ
ｍ］、ポリエステル支持体幅５２０ｍｍの支持体を用
い、乾燥後塗膜厚を１μｍ、塗布速度を３００ｍ／ｍｉ
ｎとして、実施例１と同じく塗布を行った。この時、塗
布部張力を０．１０ｋｇ／ｃｍとして設定した。(Example 3) Using the same paint, Young's modulus (MD) 1500 kg / mm 2 , thickness 10 × 10 -4 [c
m], a polyester support having a width of 520 mm is used, and the film thickness after drying is 1 μm and the coating speed is 300 m / mi.
As n, coating was performed as in Example 1. At this time, the applied portion tension was set to 0.10 kg / cm.
【００１０】（実施例４）塗布部テンションを１．００
ｋｇ／ｃｍとして設定し、塗布を行った。(Embodiment 4) The tension of the coating portion is 1.00.
It was set as kg / cm and applied.
【００１１】（比較例３）塗布部テンションを１．１０
ｋｇ／ｃｍとして設定し、塗布を行った。(Comparative Example 3) The tension of the coating portion was 1.10.
It was set as kg / cm and applied.
【００１２】（比較例４）実施例１の支持体に変更して
塗布部張力を１．００ｋｇ／ｃｍとして設定して塗布を
行った。(Comparative Example 4) The support of Example 1 was changed to apply the coating portion at a tension of 1.00 kg / cm.
【００１３】結果を表１に示す。The results are shown in Table 1.
【００１４】[0014]
【表１】 [Table 1]
【００１５】塗布部張力設定の式によって規定される値
を越えて塗布部張力を設定したものについては、下限値
を割ると塗料の転写が均一に起こらず塗布面がカスレ状
となり、上限値を越えて塗布したものは、ベースの変形
が顕著となり、ストライプ状の塗布ムラとなったり、あ
るいは塗布自体が行えなかった。一方塗布部張力設定の
式によって規定される値の範囲内の張力を使用すると、
磁性塗料の均一な塗布が達成できる。When the coating portion tension is set to exceed the value specified by the equation for setting the coating portion tension, when the lower limit value is exceeded, the transfer of the paint does not occur uniformly and the coating surface becomes dull and the upper limit value is In the case of coating beyond the above range, the deformation of the base became remarkable, resulting in stripe-shaped coating unevenness, or the coating itself could not be performed. On the other hand, if you use a tension within the range of the value specified by the formula for setting the tension of the coating part,
A uniform coating of magnetic paint can be achieved.
【００１６】[0016]
【発明の効果】以上の様に、本発明によると塗布部張力
設定の式によって規定される値の範囲内の張力を使用す
ると、磁性塗料の均一な塗布が達成できる。As described above, according to the present invention, the uniform coating of the magnetic coating material can be achieved by using the tension within the range of the value defined by the formula for setting the tension of the coating portion.
【図１】本発明で使用する塗布方式を示す概略図であ
る。FIG. 1 is a schematic view showing a coating method used in the present invention.
５、５’ バックアップロール ６ 支持体（ウエブ） ７ 磁性塗料塗布ノズル 5, 5'backup roll 6 support (web) 7 magnetic paint coating nozzle
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年８月２１日[Submission date] August 21, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００９[Correction target item name] 0009
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００９】（実施例３）同じ塗料を用い、ヤング率
（ＭＤ）１５００ｋｇ／ｍｍ２、厚み１０×１０−４ ［ｃｍ］、支持体幅５２０ｍｍの支持体を用い、乾燥後
塗膜厚を１μｍ、塗布速度を３００ｍ／ｍｉｎとして、
実施例１と同じく塗布を行った。この時、塗布部張力を
０．１０ｋｇ／ｃｍとして設定した。Example 3 Using the same paint, Young's modulus
(MD) 1500kg / mmTwo, Thickness 10 × 10-4 [Cm], using a support having a width of 520 mm, after drying
With a coating thickness of 1 μm and a coating speed of 300 m / min,
Application was performed in the same manner as in Example 1. At this time,
It was set as 0.10 kg / cm.
Claims (1)
で、ウェブに対して押出し型塗布ヘッドを相対的に押し
付けてその塗布ヘッドの少なくとも一つのスリットから
塗布液を押出して支持体に塗布する方法において、支持
体の幅１ｃｍについて加える塗布部張力を下記に示す範
囲内とすることを特徴とする磁気記録媒体の製造方法。 ０．０６＜Ｔ＜０．７・Ｅ（ＭＤ）・ｔ Ｔ：支持体幅１ｃｍ当りの塗布部張力 ［ｋｇ／ｃｍ］ ｔ：支持体厚み［ｃｍ］ Ｅ（ＭＤ）：ＭＤ方向の支持体ヤング率 ［ｋｇ／ｍｍ2 ］1. A method in which an extrusion type coating head is pressed relatively against the web without supporting the back surface of the traveling web, and the coating solution is extruded from at least one slit of the coating head to apply it to a support. In the method for producing a magnetic recording medium, the applied portion tension applied to the support having a width of 1 cm is within the following range. 0.06 <T <0.7 · E (MD) · t T: Tension of coating portion per 1 cm of width of support [kg / cm] t: Thickness of support [cm] E (MD): Support in MD direction Young's modulus [kg / mm 2 ]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03246468A JP3084308B2 (en) | 1991-09-02 | 1991-09-02 | Manufacturing method of magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03246468A JP3084308B2 (en) | 1991-09-02 | 1991-09-02 | Manufacturing method of magnetic recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0562180A true JPH0562180A (en) | 1993-03-12 |
| JP3084308B2 JP3084308B2 (en) | 2000-09-04 |
Family
ID=17148862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03246468A Expired - Lifetime JP3084308B2 (en) | 1991-09-02 | 1991-09-02 | Manufacturing method of magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3084308B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102010119B1 (en) * | 2016-04-25 | 2019-08-12 | 김석문 | Breakwater Structure |
-
1991
- 1991-09-02 JP JP03246468A patent/JP3084308B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3084308B2 (en) | 2000-09-04 |
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