JPH0796237A - Apparatus for application of magnetic coating - Google Patents

Apparatus for application of magnetic coating

Info

Publication number
JPH0796237A
JPH0796237A JP24092193A JP24092193A JPH0796237A JP H0796237 A JPH0796237 A JP H0796237A JP 24092193 A JP24092193 A JP 24092193A JP 24092193 A JP24092193 A JP 24092193A JP H0796237 A JPH0796237 A JP H0796237A
Authority
JP
Japan
Prior art keywords
magnetic
doctor blade
coating
gravure roll
coating material
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.)
Withdrawn
Application number
JP24092193A
Other languages
Japanese (ja)
Inventor
Yasuyuki Matsushita
泰之 松下
Katsuhiro Yamazaki
勝弘 山崎
Yoshio Fujita
淑雄 藤田
Yoshinobu Sakamoto
善信 阪本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Oji Paper Co Ltd
Original Assignee
New Oji Paper Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by New Oji Paper Co Ltd filed Critical New Oji Paper Co Ltd
Priority to JP24092193A priority Critical patent/JPH0796237A/en
Publication of JPH0796237A publication Critical patent/JPH0796237A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To provide an applying apparatus wherein a magnetic layer with excellent uniformity of thickness and surface flatness can be formed and the amt. of wear is less and the quality of coating being stable for a long time can be ensured even when a magnetic coating material with high solid concn. and high compounding ratio of a magnetic powder is an object to be applied as an applying apparatus for applying continuously the magnetic coating material on a non-magnetic base. CONSTITUTION:A gravure roll 1 being brought into contact with a base 4, a liq. feeding nozzle 2 for feeding a magnetic coating material on the surface 2, the first doctor blade 3a for adjusting primarily the thickness of the fed magnetic coating material and the second doctor blade 3b for adjusting secondarily the thickness are provided and when the tangent line to the gravure roll 1 is zero degree on the rear side of roll rotation, the contact angle is set at 30-90 deg. at the first doctor blade 3a and 0-30 deg. at the second doctor blade 3b.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、紙や合成樹脂フィルム
等の非磁性基材に磁性粉及びバインダーを含む磁性塗料
を連続塗布する塗布装置、特にグラビアロールの表面に
塗着した磁性塗料層をドクターブレードによって膜厚調
整して基材表面に転写するキスリバースコーター方式の
塗布装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for continuously coating a magnetic coating material containing magnetic powder and a binder on a non-magnetic base material such as paper or a synthetic resin film, and particularly a magnetic coating layer coated on the surface of a gravure roll. The present invention relates to a kiss reverse coater type coating device in which the film thickness is adjusted by a doctor blade and transferred onto a substrate surface.

【0002】[0002]

【従来の技術】磁気カードや磁気テープの如き磁気記録
媒体は、非磁性基材の表面に、Baフェライト,γ−酸
化鉄,Co含有γ−酸化鉄等よりなる磁性粉と、ポリウ
レタン系等のバインダーと、溶剤を主成分とする磁性塗
料を塗布、乾燥して磁性層を形成したものであり、記録
再生装置の電磁変換機構を介し、入力した電気信号を磁
気信号として磁性層に記録すると共に、この記録された
磁気信号を電気信号として再生できるようになされてい
る。
2. Description of the Related Art A magnetic recording medium such as a magnetic card or a magnetic tape has a magnetic powder made of Ba ferrite, γ-iron oxide, Co-containing γ-iron oxide, etc. A magnetic layer is formed by applying a binder and a magnetic coating material containing a solvent as a main component and drying it to record an input electric signal as a magnetic signal on the magnetic layer through an electromagnetic conversion mechanism of a recording / reproducing apparatus. The recorded magnetic signal can be reproduced as an electric signal.

【0003】従来、上記の磁性層形成に使用される塗布
装置としては、図2に示すように、表面に多数の溝を設
けたグラビアロール1と、このグラビアロール1の表面
に磁性塗料を幅方向に均一供給する給液ノズル2と、こ
の供給された磁性塗料の余剰分を掻き落とすドクターブ
レード3とを備え、該ドクターブレード3にて膜厚調整
された磁性塗料層を連続走行する非磁性基材4の表面に
転写する、キスリバースコーターが汎用されている。な
お、図中の5a,5bは非磁性基材4をグラビアロール
1に押し付けるためのホールドダウンロール、6はドク
ターブレード3にて掻き落とされた磁性塗料を受けるカ
ラーパンである。
Conventionally, as a coating apparatus used for forming the above-mentioned magnetic layer, as shown in FIG. 2, a gravure roll 1 having a large number of grooves formed on the surface thereof, and a magnetic coating on the surface of the gravure roll 1 Direction, a liquid supply nozzle 2 for uniformly supplying the magnetic paint and a doctor blade 3 for scraping off the surplus of the supplied magnetic paint, and a non-magnetic material which continuously runs a magnetic paint layer whose film thickness is adjusted by the doctor blade 3. A kiss reverse coater that is transferred onto the surface of the base material 4 is commonly used. In the figure, 5a and 5b are hold down rolls for pressing the non-magnetic base material 4 against the gravure roll 1, and 6 is a color pan for receiving the magnetic paint scraped off by the doctor blade 3.

【0004】ところで、近年においては、磁気記録媒体
として分解能の高密度化が希求されており、これに対応
して、磁性層形成に使用する磁性塗料は、磁性粉として
出来るだけ微粒子化したものを用いると共に、磁性層中
での磁性粉密度を高めるために、固形分濃度を40〜5
0重量%と高くし、且つ固形分中に占めるバインダーの
割合を5重量%以下と非常に少なくする傾向にある。
By the way, in recent years, there has been a demand for higher resolution of magnetic recording media, and in response to this, the magnetic paint used for forming the magnetic layer should be as finely divided as magnetic powder. In addition to using, in order to increase the magnetic powder density in the magnetic layer, the solid content concentration is 40 to 5
It tends to be as high as 0% by weight and the proportion of the binder in the solid content is 5% by weight or less, which is very small.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、前記従
来のキスリバースコーターでは、上述のように高固形分
濃度で且つ磁性粉配合比率の高い磁性塗料を塗工した場
合、形成される磁性層は表面に筋や波目が現れる等、厚
みの均一性及び表面平滑性に著しく劣るものとなり、却
って分解能の低下をきたす上、ドクターブレードの摩耗
が激しく、この摩耗によって更に厚みの均一性及び表面
平滑性の低下を招くため、該ドクターブレードの早期交
換を余儀なくされるという問題があった。
However, in the above-mentioned conventional kiss reverse coater, when a magnetic coating material having a high solid content concentration and a high magnetic powder blending ratio is applied as described above, the formed magnetic layer has a surface. The thickness and the surface smoothness are significantly inferior due to the appearance of streaks and corrugations on the surface, which in turn causes a decrease in resolution, and the doctor blade wears severely, which further contributes to the thickness uniformity and surface smoothness. Therefore, there is a problem that the doctor blade must be replaced early.

【0006】本発明は、上述の状況に鑑み、固形分濃度
及び磁性粉配合比率の高い磁性塗料に適用しても厚みの
均一性及び表面平滑性に優れた磁性層を形成でき、もっ
て近年の磁気記録媒体における分解能の高密度化の要望
に充分に対応可能であり、またドクターブレードの摩耗
が少なく、長期にわたって安定した塗工品質を確保でき
る塗布装置を提供することを目的としている。
In view of the above situation, the present invention can form a magnetic layer excellent in thickness uniformity and surface smoothness even when applied to a magnetic coating material having a high solid content concentration and a high magnetic powder blending ratio. An object of the present invention is to provide a coating apparatus that can sufficiently meet the demand for higher resolution of magnetic recording media, has less wear of a doctor blade, and can secure stable coating quality for a long period of time.

【0007】[0007]

【課題を解決するための手段】上記目的を達成するため
に、本発明に係る磁性塗料の塗布装置は、非磁性基材4
に磁性粉及びバインダーを含む磁性塗料を連続塗布する
塗布装置において、走行する前記基材4に接するグラビ
アロール1と、該グラビアロールの表面に磁性塗料を供
給する給液ノズル2と、この供給された磁性塗料の膜厚
を一次調整する第一ドクターブレード3aと、更に該膜
厚を二次調整する第二ドクターブレード3bとを具備
し、且つグラビアロール1に対する接線のロール回転後
方側を0度とした接触角度が、第一ドクターブレード3
aでは30〜90度、第二ドクターブレード3bでは0
〜30度に設定されていることを特徴とする構成を採用
したものである。
In order to achieve the above object, a magnetic paint coating apparatus according to the present invention comprises a non-magnetic substrate 4.
In a coating device for continuously coating a magnetic coating material containing a magnetic powder and a binder, a gravure roll 1 in contact with the running base material 4, a liquid supply nozzle 2 for supplying the magnetic coating material to the surface of the gravure roll, and this supply nozzle. And a second doctor blade 3b for secondarily adjusting the film thickness of the magnetic coating material, and a second doctor blade 3b for secondarily adjusting the film thickness. The contact angle with the first doctor blade 3
30 to 90 degrees in a, 0 in the second doctor blade 3b
It employs a configuration characterized by being set to -30 degrees.

【0008】[0008]

【発明の細部構成と作用】図1は本発明の塗布装置の基
本的構成を示しており、図中の1はグラビアロール、2
は給液ノズル、3aは第一ドクターブレード、3bは第
二ドクターブレード3b、4は連続走行する非磁性基
材、5a,5bはホールドダウンロール、6はカラーパ
ンである。しかして、この塗布装置では、給液ノズル2
よりグラビアロール1の表面に幅方向に均一供給され磁
性塗料は、第一ドクターブレード3aと第二ドクターブ
レード3bとによって2段階に膜厚調整されて非磁性基
材4の表面に転写される。
Detailed Structure and Operation of the Invention FIG. 1 shows the basic structure of a coating apparatus according to the present invention, in which 1 is a gravure roll and 2 is a gravure roll.
Is a liquid supply nozzle, 3a is a first doctor blade, 3b is a second doctor blade 3b, 4 is a continuously running non-magnetic substrate, 5a and 5b are hold-down rolls, and 6 is a color pan. Then, in this coating device, the liquid supply nozzle 2
The magnetic paint uniformly supplied to the surface of the gravure roll 1 in the width direction is transferred to the surface of the non-magnetic substrate 4 with the film thickness adjusted in two steps by the first doctor blade 3a and the second doctor blade 3b.

【0009】ここで、両ドクターブレード3a,3bの
グラビアロール1に対する接触角度は、該グラビアロー
ル1に対する接線のロール回転後方側を0度として、第
一ドクターブレードでは30〜90度、第二ドクターブ
レード3bでは0〜30度に設定されている。すなわ
ち、第一ドクターブレード3aは、グラビアロール1に
対して深い接触角で配置しているために大きな掻き落と
し能力を発揮し、グラビアロール1の表面に大過剰に被
着した磁性塗料の余剰分の大半を排除する量的調整機能
を担う。一方、第二ドクターブレード3bは、グラビア
ロール1の表面に被着している磁性塗料層が既に薄い膜
厚で掻き落とすべき余剰分の少ない状態にあることか
ら、摺接による均し作用を充分に発揮させるためにグラ
ビアロール1に対して浅い接触角で配置しており、少量
の余剰分を掻き落としつつ磁性塗料層の表面を均して平
滑にする機能を担う。
Here, the contact angles of the doctor blades 3a and 3b with respect to the gravure roll 1 are 30 degrees to 90 degrees with the first doctor blade, and the second doctor blade is 0 degrees on the roll rotation rear side of the tangent to the gravure roll 1. The blade 3b is set at 0 to 30 degrees. That is, since the first doctor blade 3a is arranged at a deep contact angle with respect to the gravure roll 1, it exerts a large scraping ability, and a surplus amount of the magnetic coating adhered to the surface of the gravure roll 1 in a large excess. It is responsible for the quantitative adjustment function that eliminates most of the. On the other hand, the second doctor blade 3b has a sufficient leveling action by sliding contact because the magnetic coating layer deposited on the surface of the gravure roll 1 is already thin and has a small amount of surplus to be scraped off. In order to make the most of it, it is arranged at a shallow contact angle with respect to the gravure roll 1, and has the function of smoothing the surface of the magnetic paint layer while scraping off a small amount of surplus.

【0010】この2段階の膜厚調整方式によれば、第一
ドクターブレード3aでは専ら量的調整を主体として磁
性塗料層の膜厚を大まかに設定するだけでよく、この一
次調整の段階で磁性塗料層の表面に筋や波目等の凹凸む
らを生じても、第二ドクターブレード3bによる二次調
整の段階で上記凹凸むらが均されて平滑な表面状態とな
るため、磁性塗料層は非常に均一な膜厚に調整された形
で非磁性基材4の表面に転写されることになる。また、
掻き落とし量の多い第一ドクターブレード3aが摺接抵
抗の小さい配置形態となり、摺接抵抗の大きい配置形態
の第二ドクターブレード3bは掻き落とし量が少ないた
め、両ドクターブレード3a,3b共に稼働中にかかる
負荷が小さく、それだけ摩耗を生じにくく長寿命とな
る。
According to the two-step film thickness adjusting method, the film thickness of the magnetic coating layer in the first doctor blade 3a is set roughly mainly by quantitative adjustment, and the magnetic property is adjusted in the primary adjusting step. Even if unevenness such as streaks or corrugations is generated on the surface of the paint layer, the unevenness of the unevenness is smoothed at the stage of the secondary adjustment by the second doctor blade 3b, resulting in a smooth surface state. It is transferred onto the surface of the non-magnetic base material 4 in a form adjusted to have a uniform film thickness. Also,
Both the doctor blades 3a and 3b are in operation because the first doctor blade 3a having a large scraping amount has an arrangement form having a small sliding contact resistance and the second doctor blade 3b having an arrangement having a large sliding contact resistance has a small scraping amount. The load on the bearing is small, and wear is less likely to occur, resulting in a longer service life.

【0011】従って、本発明の塗布装置は、固形分濃度
及び磁性粉配合比率の高い磁性塗料、つまり高硬度の固
形粒子を高濃度で含むために高粘度で且つ高摩擦であ
り、掻き落としに伴う抵抗が大きい上に強い研摩作用を
生じる塗料に適用しても、厚みの均一性及び表面平滑性
に優れた磁性層を形成でき、もって近年の磁気記録媒体
における分解能の高密度化の要望に充分に対応可能であ
り、またドクターブレードの摩耗も少なく、長期にわた
って安定した塗工品質を確保できる。
Therefore, the coating apparatus of the present invention has a high viscosity and a high friction because it contains a magnetic coating material having a high solid content concentration and a high magnetic powder blending ratio, that is, solid particles having a high hardness. Even if it is applied to a coating material that has a large resistance and a strong polishing action, it can form a magnetic layer with excellent thickness uniformity and surface smoothness, and in response to the recent demand for higher resolution of magnetic recording media. Sufficiently applicable, less wear of the doctor blade, and stable coating quality can be secured for a long period of time.

【0012】なお、両ドクターブレード3a,3bによ
る磁性塗料層の設定膜厚は、目的とする磁気記録媒体の
製品種や適用する磁性塗料の組成及び磁性粉含有率等に
よって異なるが、通常、第一ドクターブレード3aによ
る第一段階で10〜20μm程度、第二ドクターブレー
ド3bによる第二段階で0〜10μm程度とするのがよ
い。ただし、この第二段階での設定膜厚の下限値0μm
は、グラビアロール1のロール面の凸部には磁性塗料が
のっていないが、凹部に磁性塗料が満たされている状態
を意味する。
The set thickness of the magnetic coating layer formed by the doctor blades 3a and 3b differs depending on the product type of the target magnetic recording medium, the composition of the magnetic coating to be applied, the magnetic powder content, etc. It is preferable that the thickness is about 10 to 20 μm in the first stage by one doctor blade 3a and about 0 to 10 μm in the second stage by the second doctor blade 3b. However, the lower limit value of the set film thickness in this second step is 0 μm
Means that the magnetic coating is not placed on the convex portion of the roll surface of the gravure roll 1, but the concave portion is filled with the magnetic coating.

【0013】[0013]

【実施例】図1で示す装置構成における第一及び第二ド
クターブレード3a,3bのグラビアロール1に対する
前記接触角を種々変更し、それぞれ磁性塗料を非磁性基
材4に転写塗布して磁気フィルムを作製した各試行例、
ならびに図2で示す従来の装置構成で同様に磁気フィル
ムを作製した比較例と、これら試行例及び比較例で得ら
れた各磁気フィルムの性能試験結果(磁性層の表面状
態、分解能…電磁変換特性)とを後記表1に示す。な
お、具体的な塗布装置構成、使用した磁性塗料、塗工条
件、性能試験方法と評価は、次のとおりである。
EXAMPLE A magnetic film was prepared by changing the contact angles of the first and second doctor blades 3a and 3b with respect to the gravure roll 1 in the apparatus configuration shown in FIG. Each trial example that produced
Also, a comparative example in which a magnetic film was similarly produced by the conventional apparatus configuration shown in FIG. 2 and performance test results of each magnetic film obtained in these trial examples and comparative examples (surface state of magnetic layer, resolution ... electromagnetic conversion characteristics) ) And are shown in Table 1 below. The specific coating device configuration, the magnetic coating used, the coating conditions, the performance test method and the evaluation are as follows.

【0014】〔塗布装置構成〕 グラビアロール1・・・ロール径50mm、面長650
mm。 給液ノズル2・・・面長510mm、塗料吹出しスリッ
ト幅1mm。 ホールドダウンロール5a,5b・・・ロール径75m
m、面長650mm。
[Structure of coating device] Gravure roll 1 ... Roll diameter 50 mm, surface length 650
mm. Liquid supply nozzle 2 ... Surface length 510 mm, paint spray slit width 1 mm. Hold down rolls 5a, 5b ... Roll diameter 75m
m, surface length 650 mm.

【0015】〔磁性塗料〕 磁性粉・・・γ−Fe2 3 、平均粒子径(長軸)0.
5μm。 バインダー成分・・・ポリウレタン系樹脂(日本ボリウ
レタン社製のニッポランN−3113)部分鹸化塩化ビ
ニル−酢酸ビニル共重合体(積水化学工業社製のエスレ
ックA) イソシアネート系硬化剤(日本ボリウレタン社製のコロ
ネートL) 溶媒・・・メチルエチルケトン−トルエン混合溶媒 固形分濃度・・・45重量%。 固形分中の磁性粉含有量・・・80重量%。 固形分中のバインダー成分含有量・・・20重量%。
[Magnetic paint] Magnetic powder: γ-Fe 2 O 3 , average particle size (long axis)
5 μm. Binder component: Polyurethane resin (Nipporan N-3113 manufactured by Nippon Polyurethane Co., Ltd.) Partially saponified vinyl chloride-vinyl acetate copolymer (S-REC A manufactured by Sekisui Chemical Co., Ltd.) Isocyanate curing agent (manufactured by Nippon Polyurethane Co., Ltd.) Coronate L) Solvent: mixed solvent of methyl ethyl ketone-toluene Solid content concentration: 45% by weight. Magnetic powder content in solid content: 80% by weight. Binder component content in solid content: 20% by weight.

【0016】〔塗工条件〕 非磁性基材4・・・厚さ188μm,幅520mmのP
ETフィルム。 塗工速度・・・20m/分。 第一ドクターブレード3aでの設定膜厚・・・約15μ
m。 第二ドクターブレード3bでの設定膜厚・・・約5μ
m。
[Coating Conditions] Non-magnetic base material 4 ... P having a thickness of 188 μm and a width of 520 mm
ET film. Coating speed: 20 m / min. Set film thickness on the first doctor blade 3a: approx. 15μ
m. Set film thickness on the second doctor blade 3b ... About 5μ
m.

【0017】〔性能試験・・・磁性層の表面状態〕各試
行例及び比較例で得られた磁気フィルムの磁性層表面を
目視観察し、その結果を次のように評価した。 〇:平滑で良好な表面状態である。 ×:筋又は/及び波目が認められる。
[Performance Test--Surface Condition of Magnetic Layer] The surface of the magnetic layer of the magnetic films obtained in each trial example and comparative example was visually observed, and the results were evaluated as follows. ◯: Smooth and good surface condition. X: Streaks and / or ripples are observed.

【0018】〔性能試験・・・分解能〕各試行例及び比
較例で得られた磁気フィルムを78mm×49mmの大
きさに裁断し、その各30枚を用い、JIS B956
0−9.3の規定(磁気ストライプ付きクレジットカー
ド…磁気ストライプの電磁変換特性)に基づいて専用機
にて電磁変換特性を測定し、各試行例及び比較例に付き
上記30枚の測定値の平均値を求め、次の3段階で評価
した。なお、規定値は70%以上である。 ◎:80%以上。 〇:70〜80%。 ×:70%以下
[Performance Test ... Resolution] The magnetic films obtained in each trial example and comparative example were cut into a size of 78 mm × 49 mm, and 30 sheets of each were used, and JIS B956 was used.
The electromagnetic conversion characteristics were measured with a dedicated machine based on the regulation of 0-9.3 (credit card with magnetic stripe ... Electromagnetic conversion characteristics of magnetic stripe), and the measurement values of the above 30 sheets for each trial example and comparative example were measured. The average value was calculated and evaluated in the following three stages. The specified value is 70% or more. A: 80% or more. ◯: 70 to 80%. ×: 70% or less

【0019】[0019]

【表1】 [Table 1]

【0020】上表の結果から、固形分濃度及び磁性粉配
合比率の高い磁性塗料を塗布対象とした場合、二つのド
クターブレード3a,3bにて2段階に膜厚調整する塗
布装置では表面状態が良好で且つ分解能に優れた磁性層
を形成可能であるのに対し、一つのドクターブレードに
て1段階で膜厚設定する従来構成の塗布装置では表面状
態が悪く且つ分解能がJIS規定を満足しない磁性層し
か形成できないことが明らかである。また、両ドクター
ブレード3a,3bのグラビアロール1に対する接触角
は、JIS規定を満足するために、該グラビアロール1
に対する接線のロール回転後方側を0度として、第一ド
クターブレードでは30〜90度、第二ドクターブレー
ドでは0〜30度にそれぞれ設定すべきことが判る。
From the results shown in the above table, when a magnetic coating material having a high solid content concentration and a high magnetic powder blending ratio is applied, the surface condition of the coating device is adjusted in two steps by the two doctor blades 3a and 3b. While a good magnetic layer with excellent resolution can be formed, the coating device with the conventional structure in which the film thickness is set in one step with one doctor blade has a poor surface condition and the resolution does not satisfy the JIS standard. It is clear that only layers can be formed. Further, since the contact angle of both doctor blades 3a and 3b with respect to the gravure roll 1 satisfies the JIS standard,
It can be seen that the roll rotation rear side of the tangent to 0 should be set to 0 degrees and the first doctor blade should be set to 30 to 90 degrees, and the second doctor blade should be set to 0 to 30 degrees.

【0021】なお、比較例で示す従来構成の塗布装置で
は8時間程度の塗布でドクターブレードに偏摩耗を生じ
ていたが、試行例1〜7では累積塗布時間が240時間
に達しても両ドクターブレード3a,3b共に偏摩耗は
認められなかった。また、試行例1〜7と同様の装置構
成において、第一ドクターブレード3aのグラビアロー
ル1に対する接触角を0度、第二ドクターブレード3b
の同接触角を15度に設定して同様に塗工を行ったとこ
ろ、磁性層表面に波目状のむらが現れ、比較評価できる
状態ではなかった。
In the coating apparatus having the conventional structure shown in the comparative example, the doctor blade was unevenly worn by the coating for about 8 hours, but in the trial examples 1 to 7, both doctors were used even when the cumulative coating time reached 240 hours. Uneven wear was not observed on the blades 3a and 3b. Further, in the same device configuration as in Trial Examples 1 to 7, the contact angle of the first doctor blade 3a with respect to the gravure roll 1 was 0 degree, and the second doctor blade 3b was
When the same contact angle was set to 15 ° and coating was performed in the same manner, wavy unevenness appeared on the surface of the magnetic layer, and it was not in a state capable of comparative evaluation.

【0022】[0022]

【発明の効果】本発明によれば、非磁性基材に磁性粉及
びバインダーを含む磁性塗料を連続塗布するキスリバー
スコーター方式の塗布装置として、固形分濃度及び磁性
粉配合比率の高い磁性塗料を塗布対象としても、厚みの
均一性及び表面平滑性に優れた磁性層を形成でき、もっ
て近年の磁気記録媒体における分解能の高密度化の要望
に充分に対応可能であり、またドクターブレードの摩耗
も少なく、長期にわたって安定した塗工品質を確保でき
るものが提供される。
According to the present invention, a magnetic coating material having a high solid content concentration and a high magnetic powder mixing ratio is used as a kiss reverse coater type coating apparatus for continuously coating a magnetic coating material containing a magnetic powder and a binder on a non-magnetic base material. As an application target, it is possible to form a magnetic layer having excellent thickness uniformity and surface smoothness, and thus it is possible to sufficiently meet the recent demand for higher density resolution in magnetic recording media, and also the wear of the doctor blade. A small amount that can secure stable coating quality over a long period of time is provided.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明に係る塗布装置の基本構成を示す模式
図である。
FIG. 1 is a schematic diagram showing a basic configuration of a coating apparatus according to the present invention.

【図2】 従来の塗布装置の基本構成を示す模式図であ
る。
FIG. 2 is a schematic diagram showing a basic configuration of a conventional coating device.

【符号の説明】[Explanation of symbols]

1 グラビアロール 2 給液ノズル 3a 第一ドクターブレード 3b 第二ドクターブレード 4 非磁性基材 1 Gravure Roll 2 Liquid Supply Nozzle 3a First Doctor Blade 3b Second Doctor Blade 4 Non-magnetic Base Material

───────────────────────────────────────────────────── フロントページの続き (72)発明者 阪本 善信 兵庫県尼崎市常光寺4丁目3番1号 神崎 製紙株式会社神崎工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinobu Sakamoto 4-3-1, Jokoji, Amagasaki City, Hyogo Prefecture Kanzaki Paper Co., Ltd. Kanzaki Mill

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 非磁性基材に磁性粉及びバインダーを含
む磁性塗料を連続塗布する塗布装置において、走行する
前記基材に接するグラビアロールと、該グラビアロール
の表面に磁性塗料を供給する給液ノズルと、この供給さ
れた磁性塗料の膜厚を一次調整する第一ドクターブレー
ドと、更に該膜厚を二次調整する第二ドクターブレード
とを具備し、且つグラビアロールに対する接線のロール
回転後方側を0度とした接触角度が、第一ドクターブレ
ードでは30〜90度、第二ドクターブレードでは0〜
30度に設定されていることを特徴とする磁性塗料の塗
布装置。
1. A coating device for continuously coating a magnetic coating material containing magnetic powder and a binder on a non-magnetic base material, a gravure roll in contact with the running base material, and a liquid supply for supplying the magnetic coating material to the surface of the gravure roll. A nozzle, a first doctor blade that primarily adjusts the film thickness of the supplied magnetic coating, and a second doctor blade that secondarily adjusts the film thickness, and a roll rotation rear side of a tangent to the gravure roll. The contact angle is 0 to 30 degrees for the first doctor blade and 0 to 90 degrees for the second doctor blade.
A magnetic paint application device characterized by being set at 30 degrees.
JP24092193A 1993-09-28 1993-09-28 Apparatus for application of magnetic coating Withdrawn JPH0796237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24092193A JPH0796237A (en) 1993-09-28 1993-09-28 Apparatus for application of magnetic coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24092193A JPH0796237A (en) 1993-09-28 1993-09-28 Apparatus for application of magnetic coating

Publications (1)

Publication Number Publication Date
JPH0796237A true JPH0796237A (en) 1995-04-11

Family

ID=17066636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24092193A Withdrawn JPH0796237A (en) 1993-09-28 1993-09-28 Apparatus for application of magnetic coating

Country Status (1)

Country Link
JP (1) JPH0796237A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285840A (en) * 2006-04-17 2007-11-01 Gates Unitta Asia Co Method of measuring belt tension
JP2009160926A (en) * 2007-12-12 2009-07-23 Ricoh Co Ltd Image forming apparatus and foam application device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007285840A (en) * 2006-04-17 2007-11-01 Gates Unitta Asia Co Method of measuring belt tension
JP2009160926A (en) * 2007-12-12 2009-07-23 Ricoh Co Ltd Image forming apparatus and foam application device

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