JPS60223032A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To prevent the generation of cracks of a ferromagnetic thin metallic film during the manufacturing process of a magnetic recording medium and to improve the characteristics of said medium, by performing the heat processing after giving the specific processing to the back side of a substrate opposite to the surface of the ferromagnetic metallic thin film. CONSTITUTION:A ferromagnetic metal is stuck to a substrate to obtain a ferromagnetic thin metallic film. Then a back layer is formed at the other side of the substrate. Such a substrate is driven so as to have a contact between the back layer and the circumferential side of a heat roller. Thus, the heat processing is applied to eliminate curls. In other words, a back layer is formed before the heat processing is applied to the substrate in order to decrease the coefficient of friction less than a ground substrate. Thus the heat shrinkage is facilitated for each part of the substrate. This prevents the generation of cracks to the ferromagnetic metallic thin film. The coefficient of friction of the substrate is also reduced by roughing the surface of the substrate with recesses and projections.

Description

【発明の詳細な説明】 本発明は磁気記録媒体の製造方法に関するものである。[Detailed description of the invention] The present invention relates to a method of manufacturing a magnetic recording medium.

磁気テープ等の磁気記録媒体として、高分子フィルム等
の基体に強磁性金属を真空蒸着法やイオンブレーティン
グ法等により付着して強磁性金属薄膜を形成した構造の
薄膜型が用いられるようになってきた。As magnetic recording media such as magnetic tapes, thin film types, which have a structure in which a ferromagnetic metal is deposited on a substrate such as a polymer film by vacuum evaporation or ion blating to form a thin ferromagnetic metal film, have come to be used. It's here.

このような磁気記録媒体は、強磁性金属Ｎ膜を形成後に
通常はカールを除去するため、基体が熱ローラー等によ
り熱処理される。基体にこのような熱処理を施すと、基
体は熱収縮しようとするが、この際に熱ローラーとのＩ
！ｊ！擦力が振力の箇所により異なるために熱収縮の大
きさが不均衡となり、強磁性金属薄膜にヒビが発生する
。この強磁性金属薄膜に発生したヒビは磁気記録媒体の
出力の低下やノイズ発生の大きな原因となるもので、そ
の発生を防止することは磁気記録媒体の製造過程におけ
る技術的課題となっている。In such magnetic recording media, after forming the ferromagnetic metal N film, the substrate is usually heat-treated using a heated roller or the like to remove curls. When the substrate is subjected to such heat treatment, the substrate tends to shrink due to heat, but at this time, the contact with the heat roller
! j! Since the friction force differs depending on the location of the vibration force, the magnitude of thermal contraction becomes unbalanced, and cracks occur in the ferromagnetic metal thin film. Cracks that occur in the ferromagnetic metal thin film are a major cause of reduced output and noise generation in magnetic recording media, and preventing their occurrence is a technical issue in the manufacturing process of magnetic recording media.

本発明は、製造過程における強磁性金属薄膜のヒビの発
生を防止し、特性を向上しつる磁気記録媒体の製造方法
の提供を目的とするものである。An object of the present invention is to provide a method for manufacturing a magnetic recording medium that prevents the occurrence of cracks in a ferromagnetic metal thin film during the manufacturing process and improves the characteristics.

本発明は、上記の目的を達成するために、基体に強磁性
金属のＷｉ膜を形成し、その後前記基体のカールを防止
するだめの熱処理を行なう磁気記録媒体の製造方法にお
いて、基体の強磁性金属薄膜が形成された面と反対側の
バック面に摩擦係数を低減しつる処理を行ない、該処理
後に熱処理を行なうことを特徴とする磁気記録媒体の製
造方法を提供するものである。In order to achieve the above object, the present invention provides a method for manufacturing a magnetic recording medium in which a Wi film of ferromagnetic metal is formed on a substrate, and then heat treatment is performed to prevent the substrate from curling. The present invention provides a method for manufacturing a magnetic recording medium, characterized in that a back surface opposite to the surface on which a metal thin film is formed is subjected to a tension treatment to reduce the coefficient of friction, and a heat treatment is performed after the treatment.

以下、本発明を実施例に基づいて説明する。Hereinafter, the present invention will be explained based on examples.

先ず、ポリ上ステルやポリエチレンテレフタレート等の
高分子フィルムからなる基体に、鉄やコバルト、ニッケ
ル等の強磁性金属を真空蒸着法やイオンブレーティング
法等により付着して強磁性金属薄膜を形成する。次に、
この強磁性金属薄膜形成後の基体の反対面に、結合剤と
カーボンブラックからなる溶融液を塗布してバック層を
形成する。そしてバック層を形成した基体を、熱ローラ
ーの周側面にバック層側が接触するようにして走行させ
熱処理しカールを除去する。First, a ferromagnetic metal thin film is formed by depositing a ferromagnetic metal such as iron, cobalt, or nickel on a substrate made of a polymer film such as polyester or polyethylene terephthalate using a vacuum evaporation method, an ion blating method, or the like. next,
On the opposite side of the substrate after the ferromagnetic metal thin film has been formed, a back layer is formed by applying a molten liquid consisting of a binder and carbon black. Then, the substrate on which the back layer is formed is run with the back layer side in contact with the circumferential surface of a heated roller, and heat treated to remove curls.

１゛なわち、本発明によれば、基体に熱処理を行なう前
にバック層を設けて生地の基体よりも摩擦係数を低減し
ているために、熱ローラーの周側面を走行させた場合、
基体と熱ローラーとの摩擦力とが軽減され基体の各部の
熱収縮が容易になる。1. In other words, according to the present invention, the back layer is provided before the substrate is heat-treated to reduce the coefficient of friction than the fabric substrate, so when running on the circumferential side of the heated roller,
The frictional force between the base and the heat roller is reduced, making it easier to thermally shrink each part of the base.

それ故、基体に設【ノられた強磁性金属薄膜にヒビが発
生するのが防止される。Therefore, cracks are prevented from forming in the ferromagnetic metal thin film provided on the base.

なお、上記実施例では、バック層を設けることにより基
体の摩擦係数を低減したが、伯にたとえば凹凸状に粗面
化してもよく、同様に熱ローラーとの摩擦力を軽減でき
、ヒビの発生を防止しうるものである。In the above example, the friction coefficient of the base was reduced by providing a back layer, but the surface may be roughened, for example, in a concave and convex shape, which can similarly reduce the frictional force with the heat roller and prevent the occurrence of cracks. This can be prevented.

以上の通り、本発明によれば、熱処理の際の熱収縮を容
易にして、強磁性金属薄膜にヒビが発生Ｊるのを防止で
き、それ故に出力を向」−ぐぎノイズを減少しうる磁気
記録媒体の製造り法が得られる。As described above, according to the present invention, it is possible to facilitate thermal contraction during heat treatment, prevent cracks from occurring in the ferromagnetic metal thin film, and therefore reduce the output noise. A method for manufacturing a magnetic recording medium is obtained.

特許出願人　日立コンデン９株式会社 手続補正書（自発） 特許庁長官　殿 １、事件の表示 昭和５９年特許願第７７４４１号 ２、発明の名称 磁気記録媒体のＭ造方法 ３、補正をする省 ４、補正の対象 明細書の発明の詳細な説明の欄 ５、補正の内容 （１）明細書の第２ページ第１１行目「が曇体の箇所」
を削除づる。Patent Applicant Hitachi Conden 9 Co., Ltd. Procedural Amendment (Voluntary) Commissioner of the Japan Patent Office 1, Indication of the Case Patent Application No. 77441 of 1982, 2 Name of the Invention Method for manufacturing magnetic recording media 3, Department making the amendment 4 , Column 5 of Detailed Description of the Invention of the Specification Subject to Amendment, Contents of Amendment (1) Page 2, Line 11 of the Specification, "Place of cloudy body"
Delete.

（２）明細書の第２ページ第１２行目「異なるために」
を削除する。(2) Page 2 of the specification, line 12, “To be different”
Delete.

Claims (3)

【特許請求の範囲】[Claims] （１）　基体に強磁性金属の１ｌＩＩＩを形成し、その
後該基体のカールを防止するための熱処理を行なう磁気
記録媒体の製造方法において、基体の強磁性金属薄膜が
形成された面と反対側のバック面に摩擦係数を低減しう
る処理を行ない、該処理後に熱処理を行なうことを特徴
とする磁気記録媒体の製造方法。(1) In a method for manufacturing a magnetic recording medium in which a ferromagnetic metal 1lIII is formed on a substrate and then heat treatment is performed to prevent the substrate from curling, 1. A method for manufacturing a magnetic recording medium, characterized in that the back surface is subjected to a treatment capable of reducing a coefficient of friction, and after the treatment, a heat treatment is performed. （２）　バック面にバック層を設けることにより摩擦係
数を低減する特許請求の範囲第１項記載の磁気記録媒体
の製造方法(2) A method for manufacturing a magnetic recording medium according to claim 1, which reduces the coefficient of friction by providing a back layer on the back surface. （３）バック面を粗面化することにより摩擦係数を低減
する特許請求の範囲第１項記載の磁気記録媒体の製造方
法(3) A method for manufacturing a magnetic recording medium according to claim 1, in which the coefficient of friction is reduced by roughening the back surface.