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Herald of Technological University
Journals / Herald of Technological University / Volume 29 Issue 8 / A STUDY ON THE FEASIBILITY OF PRODUCING THIN PAPER WITH HIGH ASH CONTENT

A STUDY ON THE FEASIBILITY OF PRODUCING THIN PAPER WITH HIGH ASH CONTENT

Published in Herald of Technological University · Volume 29, Issue 8, 2026 · Pages 46–53 · Rubric: 2. Chemical Technology
DOI: https://doi.org/10.55421/3034-4689_2026_29_8_46 · EDN: QKOUMP
Received: 26.06.2026 Accepted: 27.07.2026 Published: 28.08.2026
Authors
AN
Anna Lyzhina
NA
Natalia Shcherbak
YU
Yulia Sevastyanova
D
D A Dul'kin
ABSTRACT
Mineral fillers are currently added to paper and cardboard to improve printing properties, optical characteristics, and to save fiber and energy. The production of thin, high-ash papers in Russia is dependent on imports due to technological difficulties, which can be overcome by using the necessary chemical auxiliaries. Two types of chalk are most commonly used: chemically precipitated PCC and natural chalk GCC, papers containing these additives were compared in this study. In the laboratory, castings were produced on a Rapid-Keten sheet casting machine and anisotropic samples were produced on a hydrodynamic sheet casting machine. The paper weight was 36 g/m². Bleached softwood and hardwood sulfate pulp were used, and 30-40% filler was added to the furnish. To retain chalk within the paper structure and fine fibers, a multi-component chemical system is used: 1) Hot- or cold-processed starch at a rate of 15-25 kg/t of paper. 2) Wet-strength resin, which also provides wet strength, at a rate of 0.5-5 kg/t. 3) Water-repellent additives of styrene-acrylic emulsion and/or AKD glue at a rate of 2 to 10 kg/t. Considering process factors and the time required for equipment maintenance and cleaning, the use of AKD glue is recommended. The results showed that paper samples with the addition of chemically modified chalk were brighter than those with natural chalk. Filler retention was also improved by an average of 7-9% with PCC. The optimal component ratio was found to be as follows: 50% bleached softwood pulp, 10% bleached hardwood pulp, and 40% chemically precipitated calcium carbonate (PCC grade chalk). Taking into account technological features, the complex of chemical auxiliary substances includes: moisture-resistant resin 0.5 kg/t, cold-prepared cationic starch 25 kg/t and AKD - 5 kg/t.
KEYWORDS
MINERAL FILLER, NATURAL CHALK, CHEMICALLY MODIFIED CHALK, FINE PAPERS, TEAR STRENGTH, PAPER WHITENESS, ASH CONTENT
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