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BLACK COLOR PAPER BY MULTILAYER PAPER MAKING

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  • Title:
    BLACK COLOR PAPER BY MULTILAYER PAPER MAKING
  • Author: MINEMURA KAZUMI ; SEKI KIMIHITO
  • 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
  • Description: To provide a black color paper by multilayer paper making capable of inhibiting color shading and foil color change while comprising a deep black property.SOLUTION: A black color paper by multilayer paper making comprises: the surface and back layers including a wood pulp as a main component and a black pigment; at least one middle layer provided between the surface and back layers; and an impregnation layer formed on at least one surface of the surface and back layers and impregnated by a coating liquid including a color deepening agent and polyvinyl alcohol. The content of the black pigment in the surface and back layers is 2.5 pts.mass or more but 20.0 pts.mass or less based on 100 pts.mass of absolute dry pulp. The color deepening agent includes silicone as a main component, and the surface electric resistance value measured based on IEC61340 is 1×10Ω/square or more but 1×10Ω/square or less under the atmosphere of 23°C and 50%RH. The solid content of the color deepening agent in the impregnation layer is preferably 0.1 g/mor more but 0.5 g/mor less.SELECTED DRAWING: None 【課題】濃黒色性を備えつつ、色むら及び箔の変色を抑制できる多層抄き黒色紙を提供する。【解決手段】本発明は、木材パルプを主成分とし、黒色顔料を含有する表層及び裏層と、上記表層と上記裏層の間に設けられる１又は複数の中層と、上記表層及び裏層の少なくとも一方の表面に形成される深色化剤及びポリビニルアルコールを含有する塗工液の含浸層とを備え、上記表層及び裏層における上記黒色顔料の含有量が、上記絶乾パルプ１００質量部に対して２．５質量部以上２０．０質量部以下であり、上記深色化剤がシリコーンを主成分とし、ＩＥＣ６１３４０に準拠して測定される表面電気抵抗値が、２３℃及び５０％ＲＨの雰囲気下で１×１０２Ω／□以上１×１０１２Ω／□以下である多層抄き黒色紙である。上記含浸層における深色化剤の含有量が、固形分で０．１ｇ／ｍ２以上０．５ｇ／ｍ２以下であることが好ましい。【選択図】なし
  • Creation Date: 2020
  • Language: English;Japanese
  • Source: esp@cenet
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