JPS6237448B2 - - Google Patents
Info
- Publication number
- JPS6237448B2 JPS6237448B2 JP3581479A JP3581479A JPS6237448B2 JP S6237448 B2 JPS6237448 B2 JP S6237448B2 JP 3581479 A JP3581479 A JP 3581479A JP 3581479 A JP3581479 A JP 3581479A JP S6237448 B2 JPS6237448 B2 JP S6237448B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- abrasive grains
- magnetic
- magnetic powder
- abrasive
- 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.)
- Expired
Links
- 238000004140 cleaning Methods 0.000 claims description 22
- 239000006061 abrasive grain Substances 0.000 claims description 19
- 239000006247 magnetic powder Substances 0.000 claims description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 9
- 239000004606 Fillers/Extenders Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 4
- 230000003746 surface roughness Effects 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 3
- 208000035874 Excoriation Diseases 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000010941 cobalt Substances 0.000 description 2
- 229910017052 cobalt Inorganic materials 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- -1 vinyl chloride-vinyl propionate-maleic acid Chemical compound 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Magnetic Record Carriers (AREA)
Description
この発明は磁気ヘツドのクリーニング効果を備
えたクリーニングテープに関し、その目的とする
ところは磁気ヘツドを摩耗、損傷することなく磁
気ヘツドに付着した付着異物のみを除去すること
のできるクリーニングテープを提供することにあ
る。
磁気記録再生装置の磁気ヘツドには記録再生作
動中に塵埃、磁性粉末等の磁性塗膜離脱物等が付
着する場合があり、これら異物が磁気ヘツドに付
着すると磁気ヘツドの記録再生効率が低下し、音
質あるいは画像等が劣化する。
このため、通常ポリエステルベースフイルム等
の基体に炭化珪素（SiC）等の砥粒と増量剤とバ
インダーとを混練したものを塗布してつくられる
クリーニングテープが使用され、クリーニングテ
ープの研摩塗膜を磁気ヘツドに摺接させることに
より磁気ヘツドに付着した塵埃、磁性粉末等の付
着異物を取り除いている。
ところが、従来のクリーニングテープでは粒度
の大きな砥粒が使用され、研摩塗膜の表面も粗い
ため、このクリーニングテープを用いて目づまり
した磁気ヘツドから付着異物を除去する際磁気ヘ
ツドを摩耗するおそれがあり、特にビデオ用磁気
ヘツドのように、ヘツドが小さく高速で摺接され
るため小さな衝撃でも損傷され易い磁気ヘツドに
使用する場合にはごく短時間の使用でも磁気ヘツ
ドを摩耗し、損傷するおそれがある。
この発明者らはかかる欠点を改善するため種々
検討した結果、研摩塗膜の表面粗さを中心線平均
粗さ0.10μ以下にすれば磁気ヘツドを摩耗、損傷
したりせず、0.04μ以上にすれば研摩塗膜の表面
が平滑になりすぎることもなく磁気ヘツドに付着
した付着異物を良好に除去でき、又研摩塗膜中に
増量剤とともに混入する研摩砥粒は粒度を0.2〜
2.0μにし、モース硬度９以上の砥粒と粒状酸化
鉄磁性粉末とを併用してその使用量も増量剤との
合計量に対して40重量％以下にすれば、研摩塗膜
の表面粗さを中心線平均粗さ0.04〜0.10μにでき
るとともに、磁気ヘツドを摩耗、損傷することな
く磁気ヘツドから付着異物のみを除去できること
を見い出した。又増量剤として磁性粉末を含有さ
せると研摩塗膜中に画像等を記録することができ
ることもわかりこの発明をなすに至つた。
この発明に使用される研摩砥粒は粒度が0.2μ
以下のもの或いは2.0μ以下のものを使用すると
研摩塗膜の表面粗さを中心線平均粗さ0.04〜0.10
μにすることができず、所期の目的を達成できな
いため0.2〜2.0μの粒度のものが使用される。又
研摩砥粒の粒度が0.2〜2.0μの範囲であれば研摩
砥粒が硬いほどクリーニング効果が向上するが、
モース硬度９以上の硬い研摩砥粒を単独で使用す
ると磁気ヘツドが摩耗、損傷され、又製造機器も
摩耗されるため、粒状酸化鉄磁性粉末を併用して
いる。このように両者を併用すると粒状酸化鉄磁
性粉末が磁気記録媒体の磁性層とほぼ同等の硬さ
（モース硬度約６）であるため、両者の相乗的作
用により磁気ヘツドを摩耗損傷することなくクリ
ーニング効果が向上される。特にこの発明におい
ては磁性粉末を使用しているため磁気記録を適切
に行なうことができる。併用するモース硬度９以
上の研摩砥粒と粒状酸化鉄磁性粉末との混合比率
は１対１〜１対５にするのが好ましく、モース硬
度９以上の研摩砥粒の混合比率が多すぎると磁気
ヘツドを摩耗、損傷するおそれがあり、又粒状酸
化鉄磁性粉末の混合比率が多すぎるとクリーニン
グ効果をより改善できない。使用量は前記比率で
混合したものを増量剤との合計量に対して10〜40
重量％にするのが好ましく、多すぎると磁気ヘツ
ドを損傷し易く、少なすぎると良好なクリーニン
グ効果が得られない。粒度が0.2〜2.0μでモース
硬度９以上の研摩砥粒としては例えば炭化珪素
（SiC）が挙げられる。
増量剤としては磁性粉末、針状の非磁性粉末、
カーボンブラツク等が使用され、特にカーボンブ
ラツクは光透過を良好に防止し、帯電防止効果も
有するため磁性粉末等と併用して使用される。使
用量は研摩砥粒との合計量に対して60〜90重量％
使用するのが好ましい。
この増量剤として磁性粉末を含有させると研摩
塗膜中に画像等を記録することも可能となり、画
像等を記録しておけば磁気ヘツドから付着異物が
除去されたか否かを画像等の再生で知ることがで
き、磁気ヘツドのクリーニング状態が把握できて
便利であるが、このように研摩塗膜中に画像等を
記録させるためには磁性粉末を研摩砥粒と他の増
量剤との合計量に対して少なくとも50重量％以上
含有させる必要がある。
研摩砥粒及び増量剤をポリエステルベースフイ
ルム等の基体に結着させるバインダーとしては塩
化ビニル−塩化ビニリデン共重合体、塩化ビニル
−酢酸ビニル−ビニルアルコール共重合体、塩化
ビニル−プロピオン酸ビニル−マレイン酸共重合
体などが好適なものとして使用され、使用量は研
摩砥粒及び増量剤を良好に基体に結着し、しかも
良好なクリーニング効果を発揮するようにするた
め、研摩砥粒及び増量剤等との総量に対し10〜40
重量％にするのが好ましい。
次にこの発明の実施例について説明する。
実施例
コバルト含有針状酸化鉄磁性粉末 70重量部
コバルト含有粒状酸化鉄磁性粉末（平均粒子径
0.5μ） 15 〃
SiC（平均粒子径1.0μ） 10 〃
カーボンブラツク ５ 〃
リユーロンQA−431（東洋曹達社製塩化ビニル
−プロピオン酸ビニル−マレイン酸共重合体）
25重量部
メチルイソブチルケトン 100 〃
トルオール 100 〃
これらの組成物をボールミル中で96時間混合分
散し、これを図面に示すように21μ厚のポリエス
テルフイルム１上に乾燥厚が６μとなるように塗
着乾燥したのち、60℃、210Kg／cm（線圧）の条
件でカレンダー処理して表面粗さが中心線平均粗
さ0.06μの研摩塗膜２を形成した。しかるのち所
定の幅に裁断してクリーニングテープをつくつ
た。
比較例
実施例の塗料組成において、コバルト含有粒状
酸化鉄磁性粉末に替えてα−Al2O3（平均粒子径
0.5μ）を同量使用した以外は実施例と同様にし
てクリーニングテープをつくつた。
実施例および比較例で得られたクリーニングテ
ープを、磁性塗膜離脱物あるいは塵埃等の付着に
より磁気ヘツドの目づまりしたビデオテープレコ
ーダーにかけ、目づまりのとれ具合と、クリーニ
ングテープによる磁気ヘツドの傷つき状態を調べ
た。
下表はその結果である。
The present invention relates to a cleaning tape having the effect of cleaning a magnetic head, and an object of the present invention is to provide a cleaning tape that can remove only foreign matter adhering to a magnetic head without abrading or damaging the magnetic head. It is in. Dust, magnetic powder, and other magnetic coating particles may adhere to the magnetic head of a magnetic recording and reproducing device during recording and reproducing operations. If these foreign substances adhere to the magnetic head, the recording and reproducing efficiency of the magnetic head will decrease. , the sound quality or image deteriorates. For this reason, cleaning tapes are usually used, which are made by coating a substrate such as a polyester base film with a mixture of abrasive grains such as silicon carbide (SiC), an extender, and a binder. By making sliding contact with the magnetic head, foreign matter such as dust and magnetic powder adhering to the magnetic head is removed. However, since conventional cleaning tapes use large abrasive grains and the surface of the abrasive coating is rough, there is a risk of abrasion of the magnetic head when using this cleaning tape to remove foreign matter from a clogged magnetic head. There is a risk that the magnetic head may be worn out and damaged even if used for a very short time, especially when used in magnetic heads such as video magnetic heads, which are small and slide at high speed and are easily damaged by small impacts. There is. The inventors conducted various studies to improve this drawback, and found that if the surface roughness of the abrasive coating film was reduced to a centerline average roughness of 0.10μ or less, the magnetic head would not be worn or damaged, and If this is done, the surface of the abrasive coating film will not become too smooth and foreign matter adhering to the magnetic head can be removed well, and the abrasive grains mixed in with the filler in the abrasive coating film will have a particle size of 0.2~
By using abrasive grains with a Mohs hardness of 9 or more and granular iron oxide magnetic powder, and using the amount of the abrasive grains of 2.0μ or more and using the amount less than 40% by weight based on the total amount with the filler, the surface roughness of the abrasive coating can be improved. We have found that it is possible to reduce the average center line roughness to 0.04 to 0.10 μm, and to remove only adhered foreign matter from the magnetic head without abrading or damaging the magnetic head. It was also found that images, etc. can be recorded in the abrasive coating film by incorporating magnetic powder as an extender, leading to the present invention. The abrasive grains used in this invention have a particle size of 0.2μ
If the following or 2.0 μ or less is used, the surface roughness of the abrasive coating will be reduced to a center line average roughness of 0.04 to 0.10.
Particle size of 0.2 to 2.0μ is used because it cannot achieve the intended purpose. Also, if the particle size of the abrasive grains is in the range of 0.2 to 2.0μ, the harder the abrasive grains, the better the cleaning effect.
If hard abrasive grains with a Mohs hardness of 9 or more are used alone, the magnetic head will be worn out and damaged, and the manufacturing equipment will also be worn out, so granular iron oxide magnetic powder is used in combination. When these two are used in combination, the granular iron oxide magnetic powder has a hardness almost equivalent to that of the magnetic layer of a magnetic recording medium (Mohs hardness: about 6), so the synergistic effect of the two allows cleaning of the magnetic head without causing wear and damage. The effect is improved. In particular, since magnetic powder is used in this invention, magnetic recording can be performed appropriately. The mixing ratio of the abrasive grains with a Mohs hardness of 9 or more and the granular iron oxide magnetic powder used together is preferably 1:1 to 1:5. If the mixing ratio of the abrasive grains with a Mohs hardness of 9 or more is too large, magnetic There is a risk of abrasion or damage to the head, and if the mixing ratio of the granular iron oxide magnetic powder is too high, the cleaning effect cannot be further improved. The amount used is 10 to 40% of the total amount of the mixture with the filler in the above ratio.
It is preferable to adjust the amount to % by weight; if it is too large, the magnetic head is likely to be damaged, and if it is too small, a good cleaning effect cannot be obtained. Examples of abrasive grains having a grain size of 0.2 to 2.0 μm and a Mohs hardness of 9 or higher include silicon carbide (SiC). Extending agents include magnetic powder, acicular non-magnetic powder,
Carbon black or the like is used, and carbon black in particular is used in combination with magnetic powder or the like because it effectively prevents light transmission and also has an antistatic effect. The amount used is 60 to 90% by weight based on the total amount including abrasive grains.
It is preferable to use When magnetic powder is included as an extender, it becomes possible to record images in the abrasive coating, and if the images are recorded, it can be reproduced to determine whether or not the attached foreign matter has been removed from the magnetic head. It is convenient to know the cleaning status of the magnetic head, but in order to record images etc. in the abrasive coating film, the total amount of magnetic powder, abrasive grains, and other extenders is necessary. It is necessary to contain at least 50% by weight. Binders for binding abrasive grains and extenders to a substrate such as a polyester base film include vinyl chloride-vinylidene chloride copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl propionate-maleic acid. A copolymer or the like is preferably used, and the amount used is determined so that the abrasive grains and extender can be well bonded to the substrate and exhibit a good cleaning effect. 10-40 for the total amount with
Preferably, it is expressed as % by weight. Next, embodiments of the invention will be described. Example Cobalt-containing acicular iron oxide magnetic powder 70 parts by weight Cobalt-containing granular iron oxide magnetic powder (average particle size
0.5μ) 15 〃 SiC (average particle size 1.0μ) 10 〃 Carbon black 5 〃 Lieuron QA-431 (vinyl chloride-vinyl propionate-maleic acid copolymer manufactured by Toyo Soda Co., Ltd.)
25 parts by weight Methyl isobutyl ketone 100 Toluene 100 These compositions were mixed and dispersed in a ball mill for 96 hours, and this was applied onto a 21μ thick polyester film 1 to a dry thickness of 6μ as shown in the drawing. After drying, it was calendered at 60° C. and 210 kg/cm (linear pressure) to form an abrasive coating film 2 having a centerline average roughness of 0.06 μm. After that, I cut it to the specified width and made cleaning tape. Comparative Example In the paint composition of the example, α-Al 2 O 3 (average particle size
A cleaning tape was prepared in the same manner as in Example except that the same amount of 0.5μ) was used. The cleaning tapes obtained in the Examples and Comparative Examples were applied to a video tape recorder whose magnetic head was clogged due to detachment of the magnetic coating film or adhesion of dust, etc., and the extent to which the clog was removed and the extent to which the magnetic head was damaged by the cleaning tape were examined. Examined. The table below shows the results.
【表】
上表から明らかなように、比較例で得られたク
リーニングテープでは磁気ヘツドの目づまりがと
れるものの磁気ヘツドに傷がつくのに対し、この
発明によるものは磁気ヘツドが傷つくことなく目
づまりがとれ、このことからこの発明によれば磁
気ヘツドを摩耗、損傷することなく磁気ヘツドに
付着した付着異物のみを除去できるのがわかる。[Table] As is clear from the above table, the cleaning tape obtained in the comparative example was able to remove clogs from the magnetic head but caused scratches on the magnetic head, whereas the cleaning tape according to the present invention was able to remove clogs without damaging the magnetic head. This shows that according to the present invention, only the foreign matter adhering to the magnetic head can be removed without abrading or damaging the magnetic head.
図面は、本発明によるクリーニングテープの一
実施例を示す断面図である。
１……ポリエステルフイルム、２……研摩塗
膜。
The drawing is a sectional view showing an embodiment of the cleaning tape according to the present invention. 1...Polyester film, 2...Abrasive coating film.
Claims (1)
練した研摩塗膜を基体に塗着したクリーニングテ
ープにおいて、前記研摩砥粒としてともに粒度が
0.2〜2.0μの粒状酸化鉄磁性粉末とモース硬度９
以上の砥粒とを両者合わせて増量剤との合計量に
対し40重量％以下の割合で含有させ、かつ研摩塗
膜の表面粗さを中心線平均粗さ0.04〜0.10μにし
たことを特徴とするクリーニングテープ。 ２ 増量剤中に磁性粉末を含んでなる特許請求の
範囲第１項記載のクリーニングテープ。[Scope of Claims] 1. A cleaning tape in which an abrasive coating film obtained by kneading abrasive grains and an extender with a binder is applied to a substrate, wherein both of the abrasive grains have a particle size.
Granular iron oxide magnetic powder of 0.2-2.0μ and Mohs hardness 9
The above-mentioned abrasive grains are contained in a ratio of 40% by weight or less based on the total amount of the filler, and the surface roughness of the abrasive coating film is set to a center line average roughness of 0.04 to 0.10μ. cleaning tape. 2. The cleaning tape according to claim 1, wherein the filler contains magnetic powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581479A JPS55129926A (en) | 1979-03-26 | 1979-03-26 | Cleaning tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581479A JPS55129926A (en) | 1979-03-26 | 1979-03-26 | Cleaning tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55129926A JPS55129926A (en) | 1980-10-08 |
| JPS6237448B2 true JPS6237448B2 (en) | 1987-08-12 |
Family
ID=12452389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3581479A Granted JPS55129926A (en) | 1979-03-26 | 1979-03-26 | Cleaning tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55129926A (en) |
-
1979
- 1979-03-26 JP JP3581479A patent/JPS55129926A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55129926A (en) | 1980-10-08 |
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