SEMI-BLEACHED KRAFT PAPER

摘要

PROBLEM TO BE SOLVED: To provide a semi-bleached kraft paper satisfying the strength regulated in kraft paper class 3 provided in JIS P 3401 "kraft paper", and having high discoloration resistance, and excellent bag-forming suitability (strength and paper stiffness) as a wrapping paper. SOLUTION: The semi-bleached kraft paper is obtained by using a pulp as a raw material and is subjected to dyeing treatment with a dye. The semi-bleached kraft paper has a basis weight of 50-120 g/m2conforming to JIS P 8124, satisfies the quality standards in the kraft paper class 3 provided in JIS P 3401, and has 70-80 L*, 2.0-3.0 a*and 20.0-25.0 in the a*, b*and L*calculated by CIE Lab color space provided in JIS P 8150. A dye A (Δa*>0,Δb*>0), and a dye B (Δa*<0,Δb*<0) are used as the dye, andΔE*in color difference (JIS Z 8730) after 10 hr defined in J. TAPPI No.21 method A is not more than 4.0. COPYRIGHT: (C)2010,JPO&INPIT