製紙技術者のためのデータ処理テクニックその6: インキ転移とフィルム塗工のメカニズム

摘要

紙と印刷が密接した関係にあるのは周 知の事実である.紙を基材としてこの上に文字情報や画像情報などを印刷し，新 聞，雑誌，書籍，チラシ，包装紙など多 くの製品に用いられる.印刷にはコピー 機のような電子式，インクジェット印刷 もあれば，旧来の版面上に塗布したイン キをニップ下で紙に転移させる方式など もあって，さまざまなバリエーションが ある.%It is a well-known fact that papers have close relationship with printing. Text information, image information and so forth are printed on papers, with which newspapers, magazines, books, handbills, packaging papers, etc., are produced. There are electronic type of copying machines and also ink jet printing as printing methods. There are also conventional printing methods in which ink applied on a plate is transferred to paper under nip. There are many variations known. This ink transfer phenomenon is similar to the transfer of coating color or sizing liquid from an applicator roll to paper under nip of film coater (or sizer) in the field of papermaking. In fact, many researchers did their research works on ink transfer in the field of printing at first. Then, film coater or sizer (Metered size press, MSP) was developed, and various researches have been conducted in the field of papermaking. In this article, the ink transfer mechanism which Walker and Fetsko investigated and proposed at first is described. Then, it is described that the ink transfer mechanism is applicable to understanding film transfer mechanism in film coater (or sizer).