Magnetic Ink - Jisei Ink

Japanese: 磁性インキ - じせいインキ
Magnetic Ink - Jisei Ink
Ink for creating a magnetic recording layer by printing. It was developed in the United States in the 1950s for the purpose of automatically reading check numbers. There are inks for letterpress and offset printing, but the ink contains a large amount of gamma magnetic iron oxide particles, which are not originally suitable as ink pigments, making it difficult to print. In the 1970s, strip-shaped magnetic recording parts began to be printed on various cards, savings passbooks, etc., and for this, the screen printing method was used without exception. After printing, the dried ink surface is smoothed by running a calendar over it.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
印刷によって磁性記録層をつくるためのインキ。1950年代にアメリカで小切手の番号を自動読取りする目的で開発された。凸版およびオフセット印刷用のインキがあるが,インキ中に,元来インキ用顔料としての適性のないγ磁性酸化鉄の微粒子を多量に配合しているため,印刷作業性は悪い。70年代には,各種カード類,貯金通帳などに帯状の磁性記録部分を印刷するようになったが,これには例外なくスクリーン印刷方式が用いられ,印刷後,乾燥したインキ表面にカレンダーをかけて平滑にしている。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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