...To eliminate this drawback, rubber or plastic plates using elastic or viscoelastic materials have been devised, but the former cause distortion of the image itself under high pressure, and the latter cause gradual deformation during printing. In addition, a method has been devised in which a letterpress-type plate is used to print on a rubber blanket and then transfer the image to paper (an application of the so-called offset printing method, known as dry offset or letterset). However, in this case, too, with metal letterpresses, only the image area is pressed hard when it comes into contact with the rubber blanket, distorting the rubber blanket, making it difficult to obtain good prints, especially when printing photographs. Another drawback of direct printing with letterpress is that the quality of the print depends on the smoothness of the paper, and expensive paper such as art paper is required for printing with photographic plates and primary color plates. ... *Some of the terminology that mentions "dry offset" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この欠点を除くものとして弾性材あるいは粘弾性材を用いたゴム版やプラスチック版なども考案されているが,前者の場合は大きな圧のもとでは画線そのものにひずみを生じ,後者は印刷中にしだいに変形するという問題がある。さらに,凸版形式の版でゴムブランケットに一度印刷してからこれを紙に転写する方法(いわゆるオフセット印刷方式を応用したもので,ドライオフセットdry offsetあるいはレターセットlettersetなどと呼ばれる)も考案されているが,この場合も金属凸版ではゴムブランケットとの接触時に画線部のみが強く押されるためゴムブランケットがゆがみ,とくに写真の印刷では良好な印刷物を得るのは困難である。また印刷物の品質が紙の平滑度に左右されるのも凸版によるじか刷りの欠点で,写真版,原色版などの印刷にはアート紙のような高価な紙が必要となる。… ※「dry offset」について言及している用語解説の一部を掲載しています。 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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