Coating newsprint and making method thereof

Abstract

The invention provides coating newsprint and a making method thereof. The newsprint has the following specifications: the fixed weight is 45-49g/m<2>, whiteness is 59-63%, transverse tear index is larger than 5.5m N.m<2>/g, opaqueness is larger than 95%, surface strength is larger than 1.0m/s, average smoothness of the front side and the back side is larger than 60S, the smoothness difference of the front side and the back side is less than 20%, and the longitudinal breakage length is larger than 1500m. The making method of the coating newsprint comprises the following steps of: preparing 100% regenerated fiber deinked pulp completely made from No.8 waste paper and adding auxiliary materials including retention aid, dyes and cationic starch to obtain material pulp; distributing pulp by using a headbox, forming at a neat part, carrying out composite squeezing in a four-roller three-pressing region, primary drying, surface mineral pigment coating and finishing, post-drying, reeling by using reeling machine and external re-reeling. The making method is simple, the coat of coating newsprint per ton is reduced by 250-280 yuan; the surface whiteness of the product is greatly improved, the surface of the product is smooth and fine, the ink absorption rate of the product is moderate; the printability is improved; ink consumption during printing can be reduced 10-15wt%; the printed pictures have bright color and clear wire marks; and the made coating newsprint can meet printing requirements of common newspapers and periodicals and high-quality colored newspapers and periodicals.

Description

technical field [0001] The invention relates to a coated newsprint and a manufacturing method thereof, belonging to the technical field of papermaking. Background technique [0002] At present, ordinary newsprint is produced by traditional crafts and papermaking methods, using 100% waste paper deinked pulp or waste paper deinked pulp with certain mechanical pulp. These newsprints generally have less mineral pigments added, ash content is generally 10-15%, fiber raw material consumption is large, pulp consumption per ton is as high as 970-1020kg, pulp whiteness requirements are high, conventional newsprint whiteness (ISO) 55-60% , In order to achieve this whiteness, the whiteness of waste paper deinking pulp is 54-57%, the cost is high, and the surface of the paper is rough, the ink absorption is large, and the printed characters are blurred, which is not suitable for high-end newspaper printing. Contents of the invention [0003] The purpose of the present invention is to...

AI Technical Summary

Problems solved by technology

These newsprints generally have less mineral pigments added, ash content is generally 10-15%, fiber raw material consumption is large, pulp consumption per ton is as high as 970-1020kg, pulp whiteness requirements are high, conventional newsprint whiteness (ISO) 55-60% , in order to achieve this whiteness, the whiteness of waste paper deinking pulp is 54-57%, the cost is high, and the surface of the paper is rough, the ink absorption is large, and the printed text is blurred, which is not suitable for high-end newspaper printing.

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