HIGH GRADE NON-COATED PAPER

• Main Authors: NITTA KINO, KOBAYASHI TAKAYUKI, OKAMOTO KORYO, MIYANO TAKAHIRO, OKAZAKI MASAO, YAMAGUCHI HIDEYO
• Format: Patent
• Language: English; Japanese
• Published: 21.02.2019
• Subjects: IMPREGNATING OR COATING OF PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; TEXTILES; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

To provide a high grade non-coated paper excellent in surface strength, smoothness and opacity as well as excellent in off-set and inkjet printability, especially excellent in writability with a ball point pen, a fountain pen or a pencil when used as a writing paper such as a textbook or a learning book.SOLUTION: There is provided a high grade non-coated paper containing chemical pulp of 95% or more based on 100 wt.% of pulp, and having density of 0.75 g/cmto 1.0 g/cm, in which a clear coating layer contains at least latex and starch, and a ratio of the latex and the starch is latex:starch=10:90 to 99:1.SELECTED DRAWING: None 【課題】本発明の課題は、上質系非塗工紙において、表面強度、平滑性、不透明性に優れ、かつオフセット及びインクジェット印刷適性に優れた上質系非塗工紙を提供する。特に教科書や学習帳などの筆記用紙として使用した際のボールペンや万年筆、鉛筆での筆記適性に優れる。【解決手段】パルプ１００重量％に対して化学パルプを９５％以上含有し、密度が０．７５ｇ／ｃｍ３以上１．０ｇ／ｃｍ３以下の上質系非塗工紙において、クリア塗工層が少なくともラテックスと澱粉を含有し、前記ラテックスと澱粉の比率がラテックス：澱粉＝１０：９０〜９９：１である非塗工紙。【選択図】なし